Decoupling Performance Research Articles

Layered Composite Decoupling Control Based on Regional Dynamic Sparrow Search Algorithm

This paper addresses the issues of coupling and disturbances in a dual-tank water level control system within the context of process control in chemical water treatment at industrial facilities. In response to these challenges, a Layered Composite Decoupling Control system based on the Regional Dynamic Sparrow Search Algorithm (RDSSA-LCDC) is proposed. The utilization of an enhanced Regionally Dynamic Sparrow Search Algorithm (RDSSA) addresses the pitfalls of the Sparrow Search Algorithm (SSA), such as susceptibility to local optima and inadequate precision. RDSSA is employed for the parameter tuning of the system’s PID controller. Structurally, it incorporates a Hierarchical Composite Decoupling Control (LCDC) strategy, initially establishing a forward channel to construct an inner-layer decoupling model employing pre-feedback to rectify the lower-level system’s inputs, thereby mitigating inter-branch coupling. Subsequently, it develops an improved disturbance observer model based on pseudo-inverse compensation in the feedback channel, addressing conventional disturbance observer biases, and observing and suppressing system coupling and disturbances. Finally, within the dual-tank water level control system, various control schemes are simulated and compared, affirming the approach’s commendable decoupling, responsiveness, and disturbance rejection performance.

Decoupling control of bearingless brushless DC motor using particle swarm optimized neural network inverse system

Neural network inverse system decoupling control can effectively solve the nonlinear strong coupling problem of bearingless brushless DC motor, but it has the problem of slow convergence and easy to fall into local extreme value. An Improved Particle Swarm Optimization (IPSO) algorithm has been employed to optimize the initial weights of the BP neural network inverse system. Comparisons between traditional inverse system decoupling control and the proposed method through simulations were conducted to confirm the efficacy and superiority of the proposed decoupling strategy. Furthermore, experiment research indicates that effective decoupling control can be achieved for both speed and radial displacement, as well as between the x and y-axis radial displacements, showcasing the good dynamic decoupling performance and stability of the proposed decoupling control strategy.

Decoupling economic growth from building embodied carbon emissions in China: A nighttime light data-based innovation approach

The contribution of the construction sector is indispensable for the realization of China's carbon peaking and carbon neutrality goals. However, existing studies have focused on the decoupling relationship between GDP and building life cycle carbon emissions, neglecting the utilization of Night Time Light data (NTL). The research question of this research is how to describe the decoupling relationship between Economic Growth (EG) and Building Embodied Carbon emissions (BECs) by introducing NTL. To tackle this question, the carbon emission coefficient approach is used to calculate BECs first. Then, both GDP and NTL are selected to reflect EG. The Tapio model is utilized to examine the regional and temporal evolution of China's inter-provincial decoupling performance. The main findings are as follows: 1) the number of provinces that achieved decoupling status in China is increasing, and progress has been made in BECs reduction. 2) There are significant regional differences in the decoupling of China's BECs. Particularly, most of the provinces in the south of the Hu Huanyong line show a negative decoupling for the year 2020 due to the impact of COVID-19. 3) The long-term decoupling results of GDP and NTL are consistent, while the short-term decoupling results obtained via NTL are more accurate. The study can enrich the application of NTL in the field of BECs, and provide a basis for the Government to set effective carbon reduction targets and pathways.

Voice coil motor-driven multi-DOF compliant parallel micropositioning stage based on a large range beam-based spherical hinge and fully symmetrical layout

With the recent rapid developments in the field of precision engineering, demand for the large range multi-degrees-of-freedom (DOF) micropositioning stage has increased significantly. In this paper, to solve the problems of small motion range, local stress concentration, and low motion accuracy caused by the parasitic motion of the traditional flexure hinge in the multi-DOF micropositioning stage, we first propose a type of large-range beam-based flexure spherical hinge (BFSH). Subsequently, based on the proposed BFSH, a large range 3-DOF θxθyz spatial micropositioning stage driven by the voice coil motor is designed employing parallel branch chains and a fully symmetrical layout. This arrangement realizes theoretical motion decoupling in structural design. Furthermore, we use the geometric method to derive kinematic equations of the moving platform, which are used as the decoupling matrix of the control loop. Based on the compliance matrix method and Lagrange’s method, the compliance matrix model of the BFSH, the 3-DOF micropositioning stage, and the stage dynamic model are determined respectively. Additionally, finite element analysis and experimental tests are conducted to verify the accuracy of the analytical model and assess the static and dynamic performance of the designed 3-DOF stage. Moreover, a fractional order phase advanced proportional integral controller is designed for closed-loop control to track the sinusoidal trajectory and spherical trajectory. The results reveal that the stage can achieve the desired large workspace of ± 21.5 mrad × ± 20.3 mrad × ± 3.23 mm, as well as excellent decoupling and trajectory tracking performance.

Decoupling control of radial 4 degree of freedom system of magnetic-liquid double suspension bearing based on generalized extended state observer.

As the novel suspension bearing, Magnetic-Liquid Double Suspension Bearing (MLDSB) is mainly supported by magnetic suspension and supplemented by a liquid hydrostatic bearing. Due to its great bearing capacity and stiffness, rapid response, great active control, and so on, MLDSB is suitable for medium speed heavy loads and has a large carrying capacity and high operating stability. In addition, the radial inertia coupling and gyroscopic coupling between radial 4-DOF control channels can reduce control precision, operation stability, and reliability of MLDSB. Therefore, a mathematical model of radial 4-DOF rotor-dynamics of MLDSB is established in this paper, and the inherent coupling mechanism is explored. Taking inertial coupling, gyroscopic coupling, and external disturbance loads as lumped disturbances, a decoupled controller based on Generalized Extended State Observer (GESO) is established. The influence of the GESO controller on the decoupling and control performance of radial 4-DOF control channels is simulated. The results indicate that the decoupling effect of the GESO controller is great. Under the action of step signal, the steady displacement, maximum displacement, adjustment time, and peak time of the rotor after decoupling are all reduced, among which the steady displacement and maximum displacement are the most obvious. Under the sinusoidal signal, the steady displacement and maximum displacement are reduced by 90%, which can effectively avoid the "gap-impact" fault. Under the pulse signal, the steady displacement, maximum displacement, adjustment time, and peak time are all reduced, among which the maximum displacement is the most obvious. The research in this paper can provide a theoretical reference for the stable support and decoupling control of MLDSB.

Isolation Improvement Using the Field-Circuit Combined Method for In-Band Full-Duplex MIMO Antenna Arrays

This paper proposes a field-circuit combined decoupling method for co-polarized in-band full-duplex multiple-input multiple-output (MIMO) antenna arrays. The proposed field-circuit combined method is composed of decoupling network and neutralization-based decoupling. An in-band full-duplex antenna with high isolation and low cross-polarization level is designed and extended to a 1 × 4 linear array. The decoupling network and ADS are applied for the array to alleviate the mutual coupling by rebuilding the neutralization wave paths in the circuit and field domains. Thus, low coupling (< −25 dB) among the transmitting/receiving antennas and high isolation (> 47 dB) between the transmitting and receiving antennas are achieved at 2.6 GHz, exhibiting a superior decoupling performance.

Two-Step Decoupling Design of a Microstrip Antenna Array by Using Waveguided Complementary Split-Ring Resonators and a Fully Connected Neural Network

To suppress the mutual coupling between closely-spaced patches, we propose a two-step decoupling design approach for a microstrip antenna array with the dimensions of 44.9 × 30.495 mm2. The first step is designing a decoupling unit on the basis of waveguided complementary split-ring resonators (WCSRRs) to improve isolation. The second step is presenting an optimization method by using a fully connected neural network (FCNN) to enhance design efficiency. By inserting WCSRRs structure between two patches with the edge-to-edge distance of 0.24λ0 (port-to-port distance with 0.66λ0), where λ0 is the wavelength of free space at a resonant frequency of 9 GHz, the mutual coupling can be reduced to −29.38 dB, which is confirmed by the EM simulation. We use the simulation results of the array geometries and EM performances to train FCNN at first and then use the trained FCNN to predict the array geometric parameters for the optimal EM response when the edge-to-edge distance between patches is further reduced to 0.21λ0 and 0.18λ0 (port-to-port distance reduced to 0.60λ0 and 0.56λ0). The measured isolation of the predicted microstrip antenna array is increased to 41.05 dB and 52.33 dB, respectively. Compared to the EM simulation, our FCNN approach has a higher accuracy and lower computational complexity. Therefore, the proposed array predicted by FCNN has a better decoupling performance. All the simulated and predicted results are validated via the measurement to demonstrate the effectiveness of our design scheme. The advantages of our work include the good decoupling performance of the proposed WCSRRs and the convenient optimization of the FCNN from physical response to optimal antenna array geometry design.

Design and calibration of spoke piezoelectric six-dimensional force/torque sensor for space manipulator

The large manipulator outside the space cabin is a multi-degree of freedom actuator for space operations. In order to realize the automatic control and flexible operation of the space manipulator, a novel spoke structure piezoelectric six-dimensional force/torque sensor with redundancy ability, high stiffness and good decoupling performance is innovatively proposed. Based on the deformation coordination relationship, the redundancy measurement mechanism is revealed. The mathematical models of the sensor with and without branch fault are established respectively. The finite element model is established to verify the feasibility of structure and redundancy measuring principle of the sensor. Depending on the theoretical analysis and simulation analysis, the prototype of the sensor is developed. Static and dynamic calibration experiments are carried out. The actual output voltage signal of the six-dimensional force/torque sensor is collected to establish the equation between the standard input applied load and the actual output voltage signal. Based on ant colony optimized BP algorithm, performance indexes of the sensor with and without branch fault are analyzed respectively. The experimental results show that the spoke piezoelectric six-dimensional force/torque sensor with the eight-point support structure has good accuracy and reliability. Meanwhile, it has strong decoupling characteristic that can effectively shield the coupling between dimensions. The nonlinear errors and maximum interference errors of decoupled data with and without branch faults are less than 1% and 2%, respectively. The natural frequency of the six-dimensional force sensor can reach 2856.45 Hz and has good dynamic characteristics. The research content lays a theoretical and experimental foundation for the design, development and application of the new six-dimensional force/torque sensors with redundancy. Meanwhile, it will significantly improve the research level in this field, and provide a strong guarantee for the smooth implementation of force feedback control of the space station manipulator project.

The impact of corporate social responsibility decoupling on financial performance: the role of customer structure and operational slack

PurposeCorporate social responsibility (CSR) decoupling indicates a misalignment between how firms report CSR and what firms actually practice with respect to CSR. The purpose of this paper is to examine the relationship between CSR decoupling and financial performance and the factors affecting this relationship.Design/methodology/approachThis paper collects and combines secondary panel data from multiple sources of Chinese listed firms from 2008 to 2020 to test the direct impact of CSR decoupling on firms’ financial performance and the moderating role of customer structure and operational slack.FindingsThis paper finds that CSR decoupling is negatively associated with firms’ financial performance. These findings further suggest that the negative relationship can be suppressed by customer stability and operational slack, but amplified by customer concentration. These conclusions remain robust to alternate measures of independent and dependent variables and narrower samples.Originality/valueIn the literature, the effect of CSR on firms’ financial performance is inconclusive. This is the first study to examine the impact of CSR decoupling on firms’ financial performance and the factors affecting this relationship. This paper contributes to the CSR decoupling literature from an operations and supply chain management perspective.

Design and Analysis of an Active Swing Decoupling Compliant Mechanism With Multiple Co-Directional Input Branches

AbstractIn this work, we propose a novel bio-inspired swing decoupling mechanism supporting high precision motion systems, which is composed of multiple co-directional input branches with a rigid swing unit and an anti-rotational guiding unit. By actively adjusting the input displacements, the decoupling mechanism can switch between the swing and translational modes, where the parasitic rotations can be significantly suppressed by the anti-rotational guiding unit. With this, fully decoupled X and Y linear motions are obtained in the presence of co-directional input branches. A theoretical model of the decoupling mechanism is also established to accurately describe the decoupling behavior, which is verified by finite element simulations. A prototype of the proposed swing decoupling mechanism is fabricated and instrumented with comprehensive experimental apparatus, where the experimental results effectively validate the excellent decoupling performance and demonstrate good potentials to precision engineering applications.

Robust Power Decoupling Based on Feedforward Decoupling and Extended State Observers for Virtual Synchronous Generator in Weak Grid

Virtual synchronous generator (VSG) can provide inertia support for a more renewable-energy-integrated power system. However, there are power couplings between active power and reactive power in a weak grid. To solve this issue, the dynamic models of active power and reactive power are established first to better reflect the characteristics of power coupling. Then, the feedforward decoupling method using virtual power angle and virtual voltage is designed under the nominal system, which can suppress the power couplings well. Furthermore, considering the variation of line impedance, a power decoupling strategy based on extended state observers (ESOs) is proposed, which can estimate the power couplings as the internal disturbances of the system and output compensations for the feedforward decoupling method. Consequently, the robustness of the proposed strategy is improved greatly, and good decoupling performance can be achieved under different line impedance conditions. Finally, the effectiveness of the proposed method is verified by both simulation and experimental results.

Residual proton line width under refocused frequency-switched Lee-Goldburg decoupling in MAS NMR.

Despite many decades of research, homonuclear decoupling in solid-state NMR under magic-angle spinning (MAS) has yet to reach a point where the achievable proton line widths become comparable to the resolution obtained in solution-state NMR. This makes the precise determination of isotropic chemical shifts difficult and thus presents a limiting factor in the application of proton solid-state NMR to biomolecules and small molecules. In this publication we analyze the sources of the residual line width in refocused homonuclear-decoupled spectra in detail by comparing numerical simulations and experimental data. Using a hybrid analytical/numerical approach based on Floquet theory, we find that third-order effective Hamiltonian terms are required to realistically characterize the line shape and line width under frequency-switched Lee-Goldburg (FSLG) decoupling under MAS. Increasing the radio-frequency field amplitude enhances the influence of experimental rf imperfections such as pulse transients and the MAS-modulated radial rf-field inhomogeneity. While second- and third-order terms are, as expected, reduced in size at higher rf-field amplitudes, the line width becomes dominated by first-order terms which severely limits the achievable line width. We expect, therefore, that significant improvements in the line width of FSLG-decoupled spectra can only be achieved by reducing the influence of MAS-modulated rf-field inhomogeneity and pulse transients.

Extremely Compact Interconnected Half-Mode Cavity Antennas With Enhanced Isolation for MIMO System

We propose the interconnected half-mode cavity antennas (HMCAs) with enhanced isolation that have a very close center-to-center distance of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.13 \lambda _{0} $ </tex-math></inline-formula> . First, by both tuning the differential mode (DM)-first impedance through a pair of inductors and creating an extra coupling path through the feeding branches, the half-mode of the cavity could be formed, and the isolation between the dual feeding ports in a single cavity could be greatly enhanced from 2 to 25–50 dB over the working band from 4.9 to 5.1 GHz. Then, we extend the dual-port to four-port HMCAs with a total length of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.54 \lambda _{0} $ </tex-math></inline-formula> through the connection of dual cavities, and the isolation between the adjacent cavities could be enhanced from 7 to better than 23 dB by employing the tuning lines to tune the common mode (CM)-second impedance. Furthermore, the extremely compact interconnected eight-port HMCAs are presented with a total length of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$1.08 \lambda _{0} $ </tex-math></inline-formula> . Finally, the experimental results also validate the effectiveness of our proposed HMCAs with excellent decoupling performance. Our proposed design should provide promising application values for the extremely compact multiple-input multiple-output (MIMO) systems.

Investigation of decoupling of thermal and electrical performance of semi-transparent photovoltaic windows based on the external quantum efficiency

Semi-transparent photovoltaic (STPV) windows have great potential in buildings energy saving due to their power generation and reduction of buildings energy consumption. STPV windows have a complex optical-thermal-electrical coupling mechanism. However, previous studies have rarely considered the coupling mechanism when simulating the thermal and electrical performance of STPV windows, which has resulted in the power generation being incorrectly treated as waste heat. As has been mentioned in EN 50583:2016 and IEC 63092:2020, the calculation of thermal performance of STPV windows should consider the mechanism that part of absorbed solar energy is transformed into electricity rather than heat. With considering the mechanism, based on the external quantum efficiency (EQE) of solar cells, a decoupled optical, thermal, and electrical performance simulation method for STPV windows was proposed in this study. Firstly, the optical characteristics of STPV windows and the EQE of the integrated solar cells were measured by a spectrophotometer and a monochromatic incident photon-to-electron conversion efficiency (IPCE) testing device, respectively. The EQE was used to calculate the spectral photoelectric conversion efficiency (SPCE) of STPV windows. Then, the SPCE was subtracted from the original absorptance and added to the front reflectance at corresponding wavelength, thereby decoupling the thermal and electrical performance. To verify the importance of the decoupling, the thermal and electrical performance of STPV windows with and without decoupling were investigated using EnergyPlus and WINDOW programs. An outdoor experimental rig was used to validate the simulation results of EnergyPlus, it was found that the decoupled results match well with experimental results. The simulation results show that in the coupled case, the window temperature and cooling load were overestimated, while the heating load was underestimated. However, the impact on power generation was negligible due to the low temperature coefficient of efficiency. Besides, for the analyzed STPV glazing configuration, the solar heat gain coefficient (SHGC) of the coupled case is relatively 9.3% higher than that of the decoupled case, when the solar cell coverage ratio is 70%. Moreover, the decoupled calculation method provides a theoretical basis for more accurate simulation and overall performance evaluation of STPV windows in maximum power point (MPP) state.

Decomposition and decoupling analyses of CO2 emissions and economic growth: A comparative study between Malaysia and Vietnam

During the COVID-19 pandemic, Malaysia and Vietnam has managed to show a strong positive growth domestic product (GDP) growth indicator – with both countries recording an average increase of more than 4% annually. However, there was a strong positive correlation between GDP and carbon dioxide (CO2) emissions worldwide. As the impact of climate change becomes more evident, especially in Southeast Asia, it is crucial to assess the relationship between these two indicators caused by gross electricity generation, especially in the post-pandemic period. In this study, we compared the decoupling performance of CO2 emissions and GDP growth between Malaysia and Vietnam. The data for Malaysia and Vietnam were quantified by the decoupling method based on the Tapio decoupling model. The data were then decomposed using the Kaya identity into the driving factors affecting decoupling. This was then used to form the decomposition index using the Logarithmic Mean Divisia Index-I (LMDI-I). Data were generated based on three scenarios: i) 2017-2019, i.e. pre-pandemic, ii) 2019-2020, peri-pandemic and iii) 2021-2025, to predict post-pandemic. In terms of the overall decoupling trend, the study shows that: (1) the change in CO2 emissions in both sovereign states decreased dramatically at the beginning of the COVID-19 pandemic. However, Malaysia experienced negative change in CO2 emissions, while Vietnam still experienced a positive change. This is due to Vietnam’s slightly higher reliance on coal for power generation than Malaysia. (2) A strong decoupling in the projected decoupling between the change in CO2 emissions and GDP in Vietnam, while the two indicators remain coupled for Malaysia. This is due to Vietnam’s more aggressive policy in the adoption of renewable energy - especially through the mass installation of rooftop photovoltaic systems. In contrast, Malaysian policy remains conservative, emphasising reliability at the cost of a huge year-on-year change in CO2 emissions.

Large-Slenderness-Ratio Supersonic Aircraft Lateral–Directional Coupling Dynamics Analysis and Control

Large-slenderness-ratio aircraft in which a large portion of the aircraft’s mass is concentrated along its centreline face the problem of severe lateral-directional coupling. Previous research has not fully considered the inertia product when conducting stability analyses of such aircraft. However, neglecting the inertia product may threaten the safety of the aircraft during high-speed flight. This paper investigates the effect of the inertia product on the lateral–directional stability. Two methods, one based on eigenstructure assignment (EA) and the other based on an extended state observer (ESO), are developed for the lateral–directional decoupling of a research large-slenderness-ratio aircraft. Simulation results show that both methods can realize decoupling control. The EA-based control achieves better decoupling performance, whereas the ESO-based control has an advantage in terms of disturbance rejection. Finally, the ESO-based attitude controller is validated through a high subsonic flight test. The decoupling and tracking performance of the attitude control demonstrate the effectiveness and practicality of the ESO-based controller.

A Two-Port Microstrip Antenna With High Isolation for Wi-Fi 6 and Wi-Fi 6E Applications

In this article, a two-port microstrip antenna (MSA) with high isolation is presented for simultaneously supporting wireless fidelity 6 (Wi-Fi 6) and wireless fidelity 6E (Wi-Fi 6E) applications. Due to the narrow guard band between Wi-Fi 6 (5.15–5.83 GHz) and Wi-Fi 6E (5.92–7.125 GHz), the mutual coupling near common edge frequencies cannot be sufficiently suppressed by existing filters. To mitigate the mutual coupling over the guard band of a symmetrical two-port MSA, the common-mode (CM)/differential-mode (DM) cancellation theory was utilized. Then, the operating frequencies of two ports were tuned to Wi-Fi 6 and Wi-Fi 6E bands, without deteriorating the original decoupling performance. Finally, two filters were loaded to realize high isolation over the whole working bandwidth. For the demonstration, a prototype was fabricated and measured. The measured results show that the proposed two-port MSA achieves the impedance bandwidth of 5.49–5.9 and 5.89–7.14 GHz and the isolation over 20 dB across the whole band. The results indicate that the proposed antenna is a promising candidate for Wi-Fi 6 and Wi-Fi 6E applications.

공공기관의 전략·실행·문화간 디커플링이 경영성과에 미치는 영향

The public sector is under institutional pressure to simultaneously demand market principles such as economy and efficiency required by the private sector due to the spread of the New Public Management (NPM) paradigm along with traditional values-oriented ideology such as accountability and accountability. In this study, decoupling that appears in this management performance evaluation system was interpreted based on the new institutional theory and structural situation theory. In addition, an analysis was attempted on the effect of decoupling on management performance. In this study, the dependent variable, management performance, was measured as a management evaluation grade. In addition, decoupling between independent variables, strategy, execution, and culture, was measured through management evaluation indicators. Specifically, the strategic system was set as a 'strategic planning' indicator, the implementation system was set as a sum of 'organization, personnel, general remuneration, and welfare' indicators, and the cultural system was measured through differences. All analyses were conducted through panel regression analysis. As a result of the analysis, it was found that decoupling between the strategy and implementation system had a negative (-) correlation with management performance. In the end, it was confirmed that the decoupling between the strategy and implementation system of public institutions was close to a negative phenomenon that had to be resolved. In addition, this study analyzed the moderating effects of strategy-execution decoupling and management performance by separating the innovation set as a cultural system. As a result, it was found that organizational innovation further strengthens the negative (-) correlation of decoupling on management performance, unlike the positive (+) effect of innovation on management performance.

A Compact Double-Sided FSS Absorbing Wall for Decoupling 5G Antenna Arrays

The fifth generation (5G) of mobile communications givesbirth to the evolution of the base stations. They progressively include arrays of antennas in the sub-6 GHz frequency band worldwide. Moreover, 5G takes advantage of the beamforming capabilities to gain power efficiency and higher throughputs. Within this framework, achieving high decoupling performance between any pairs of antennas and compactness at the same time become a major challenge. The present paper describes an advanced solution based on the interposition of a thin and low-profile absorbing wall operating in the 3.4–3.6 GHz frequency band. The absorption is provided by a frequency selective surface whose elementary pattern size is first optimized. Then, the compact absorbing wall that associates back-to-back pieces of absorber is interposed between elements of an antenna array. Moreover, the fabrication of both antenna array and decoupling device involve lightweight and low-cost composite technology. The results show that such a compact decoupling device achieves excellent decoupling capabilities while keeping up the antenna array performance.

Phase-Unsynchronized Power Decoupling Control of MMC Based on Feedback Linearization

The traditional power decoupling control of modular multilevel converter (MMC) is based on the phase synchronization achieved by the phase-locked loop (PLL), and MMC intricate inner dynamics are ignored, which jeopardizes the system stability and power decoupling. To improve the performance, a nonlinear phase-unsynchronized power decoupling control for MMC is proposed without PLL. At first, the MMC model as a nonlinear multi-input multi-output system is developed. The developed model illustrates that the MMC power coupling is caused by the ac current as well as the MMC capacitor voltages. Then, through the input–output linearization method, the proposed method decouples the MMC output powers without the phase synchronization. Involving integral control, the dynamics of MMC output powers are designed as second-order systems so that the control parameters can be easily determined based on the required transient performance. To verify the accuracy and correctness of the developed model, a comparison of MMC dynamics with the proposed control is conducted between the numerical solution in MATLAB and the EMT simulation in PSCAD/EMTDC. Moreover, seven cases in the EMT simulations and four cases in the experimental results demonstrate the desired phase asynchronization and power decoupling performance of the proposed method compared with the conventional <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$dq$</tex-math></inline-formula> control. At last, the system zero dynamic stability is investigated and the influences of MMC control parameters, ac-side voltage, dc-side voltage and equilibrium points are analyzed to evaluate the stability performance of the proposed method.