Split-source Inverter Research Articles

Simplified Predictive Control Strategy for Dual-Input Three-Phase Split-Source Inverter With Minimized Computational Burdens

Simplified Predictive Control Strategy for Dual-Input Three-Phase Split-Source Inverter With Minimized Computational Burdens

Split‐source inverter with adaptive control scheme‐based shunt active power filter for power quality improvement

AbstractAlthough single‐stage inverters are popular for simpler design they face difficulties in shoot‐through mode operation. Insufficient DC voltage regulation and complicated LC network are principal drawbacks of these topologies. A new split source inverter (SSI) can solve problems with single‐stage inverters. In this paper, SSI replaced the voltage source inverter (VSI) of a shunt active power filter (SAPF) which alleviates power quality (PQ) issues in power system. Furthermore, a VSI‐based SAPF faces challenges to maintain consistent voltage across DC‐link capacitor, exactly compensating current generation, and switching loss reduction in inverter. This study examined efficacy of two inverter‐based SAPFs considering a modified synchronous reference frame approach for generating reference current; fuzzy logic controller for regulating DC‐link voltage; and adaptive fuzzy hysteresis current controller for generating switching pulses. Ideal and non‐ideal sources were considered when running the simulations for various load circumstances. The proposed SSI‐based SAPF with an advanced control approach can eradicate source current harmonics to 0.52% and 0.45% under ideal source conditions, and 0.65% and 0.54% under non‐ideal source conditions for non‐linear loads. Similarly, the ripples in the DC‐link voltage are also reduced to 2–3 V for the ideal case and 4–5 V for non‐ideal case.

Advanced control of split source inverter through finite control-set model predictive control for improved system performance.

Distributed power generation systems may necessitate connecting multiple independent energy sources that employ various converter topologies. A recent development in this field is the emergence of impedance source converters, offering the ability to deliver buck-boost functionality within a single stage. The split-source inverter (SSI) has been introduced as a novel choice in between this family. Many control strategies have emerged for electrical power systems control. Among the recent emerging controllers, model predictive control strategies have become an effective technique for control systems. Model predictive controllers (MPCs) offer a number of features compared to the conventional and counterpart models such as enhanced system response and improved system transients with reduced steady-state error. This research suggests a finite control-set MPC for three-phase single-stage SSI supporting a standalone load for remote area applications. Considering the proposed FCS-MPC, the output load current tracks its reference magnitude with minimized error. In addition, the proposed FCS-MPC enhances the proposed SSI system performance with a settling time of 10 μs, and approximately without overshoot in the output current. The system has been validated using Opal-RT OP-4510 and the power loss model of the inverter has been explained. In the end two comparisons have been presented to clarify the main points in the topology structure and the control technique.

An improved model predictive control for linear induction machine drive-based split-source inverters

The Split Source Inverter (SSI) is a single-stage DC-AC converter topology widely recognized for its beneficial features compared to the Z-source inverter. These advantages include a reduced number of components, a constant input current, and minimized losses. This study aims to extensively investigate and analyze the operation of a 3 kW Linear Induction Motor (LIM) using SSI through comprehensive simulations. The suggested control approach, employing finite control-model predictive thrust control (FC-MPTC), exhibits remarkable dynamic behavior and achieves a fast transient response without necessitating modifications to the control loop. Moreover, the proposed method allows for the manipulation of multiple variables by utilizing a single cost function, eliminating the need for lookup tables. The efficacy of the proposed control method is validated through comprehensive simulations and experimental tests, which exhibit accurate reference tracking speed and superior dynamic performance in regulating the thrust and primary flux. The results also showed that the proposed method had lower undulations of 5.8% than the traditional method. The proposed approach outperforms the DTC-SVM method under varying load and speed conditions by delivering remarkable accuracy and improved control characteristics.

Dual-input configuration of three-phase split-source inverter for photovoltaic systems with independent maximum power point tracking

This paper presents a dual-input configuration for the three-phase split-source inverter (SSI) to be used with photovoltaic (PV) systems, it is denoted as DSSI. Compared to using one SSI for each PV input, the proposed configuration uses a lower number of semiconductors. Thus, lower cost along with higher power density can be acquired. The proposed DSSI inherits the brilliant features of the conventional SSI. This includes continuity of input current and high voltage boosting gain. The proposed DSSI offers independent control for the power extracted from each PV source. Thus, independent maximum power point (MPP) tracking is ensured. In addition, no circulating current between the input ports is generated. Simple modulation technique is developed for the proposed configuration. In addition, the control system design to ensure independent MPP tracking along with power quality requirements is illustrated. Comparative study with other dual-input topologies is presented. Simulation, experimental as well as real-time simulation results for DSSI are presented. The results show good performance under dual- and single-input scenarios. In addition, well dynamic performance is verified. Thus, performance at steady-state and dynamic conditions is validated for the proposed DSSI. An efficiency of 92.3 % is achieved by the experimental prototype.

High-Boost-Gain Split-Source Inverter With Shared-Ground and No Shoot-Through Issue

High-Boost-Gain Split-Source Inverter With Shared-Ground and No Shoot-Through Issue

Model Predictive Control for Single-Stage Three- Phase Split Source Inverter With Enhanced Switched-Inductor Configuration

Model Predictive Control for Single-Stage Three- Phase Split Source Inverter With Enhanced Switched-Inductor Configuration

Losses Analysis of a Three-Phase Bidirectional Active Split Source Inverter for Traction Applications

Losses Analysis of a Three-Phase Bidirectional Active Split Source Inverter for Traction Applications

A Comparison Analysis of a New Switched-Inductor and Conventional Split Source Inverter Structures

A Comparison Analysis of a New Switched-Inductor and Conventional Split Source Inverter Structures

A Bipolar Pulse Generator With High-Voltage Gain Based on Three-level Neutral-Point-Clamped Split-Source Inverter

A Bipolar Pulse Generator With High-Voltage Gain Based on Three-level Neutral-Point-Clamped Split-Source Inverter

Three-phase bidirectional active split source inverter for automotive traction application

The Split Source Inverter (SSI) is an attractive single-stage boost DC–AC converter topology. It requires fewer components than the Z-source inverter to achieve the boost function and also maintains a continuous input current. However, a significant drawback of this topology is its limited DC-bus voltage utilization. This paper introduces a new inverter topology derived from the SSI, aimed at addressing the DC voltage utilization issue and assessing its viability for traction applications. The new three-phase single-stage boost DC–AC inverter topology is named B-ASSI, and a potential modulation scheme is proposed to accompany it. To verify their functionality, the proposed converter and modulation scheme are simulated using Matlab/Simulink. Furthermore, a Proof of Concept (POC) is executed to experimentally validate the performance of the proposed inverter topology.

Single-phase dual-input split-source inverter for photovoltaic systems

This paper proposes dual-input configuration of split-source inverter (abbreviated as DSSI) to transfer the power of two photovoltaic (PV) modules simultaneously or individually. The proposed DSSI keeps the continuity of the input current and the voltage boosting capability offered by the conventional split-source inverter (SSI). Thus, independent as well as efficient tracking of the maximum power points (MPPs) is realized. In addition, low capacitance is utilized for power decoupling in single-phase circuits. Compared to using one SSI per PV source to feed a common load, the proposed DSSI uses lower number of switches at reduced total volt-ampere stresses. Therefore, decreased cost, size, and control circuitry are realized. Simple unipolar modulation technique is presented. Accordingly, the modes of operation and the Volt-ampere stresses of the switches are explained. A closed loop control system is explained to fulfill operation at MPP along with regulation of DC-link voltage and load current. Comparative study with other dual-input topologies is presented. Experimental results as well as real-time simulation results for dual- and single-input scenarios are presented. Also, the dynamic performance under step change in the radiation is investigated. Finally, the capability of operation under different power factors is verified.

Performance investigation and control design of SSI grid-connected system for PV applications with maximum power extraction

Split-source inverter (SSI) has been recently developed as an alternative to the commonly used ZSI where it can serve an interface between the renewable energy sources and the common grid. This paper presents a mathematical model and control strategy for grid-connected SSI system with either constant voltage source or photovoltaic (PV) source. The control strategy is based on linear PI controllers which are fine-tuned by the frequency loop shaping method with the help of the derived mathematical model to ensure the stability of the system with robust dynamic behavior. The derived mathematical model provides a straightforward and efficient understanding of the dynamics resulting from the interaction between the PV and the SSI grid-connected system. The simulation results indicate that the system has a robust dynamic behavior when subjected to various transient conditions. Finally, a downscaled prototype of SSI grid-connected system is implemented to experimentally validate both the mathematical model and control strategy.

Three-Phase Multiport DC–AC Inverter for Interfacing Photovoltaic and Energy Storage Systems to the Electric Grid

Distributed renewable energy sources (RES) in combination with hybrid energy storage systems are capable to smooth electric power supply and provide ancillary services to the electric grid. In such applications, multiple separate DC-DC and DC-AC converters are utilized, which are configured in complex and costly architectures. In this paper, a new non-isolated multiport DC-AC power inverter is presented, which comprises less passive components and less high-frequency power semiconductors. The proposed grid-connected multiport converter (MPC) enables the integrated power management of a photovoltaic (PV) array, a battery unit, a supercapacitor bank and the battery of an electric vehicle. The power circuit of the proposed MPC inverter is based on a new version of a split-source inverter topology to support bidirectional power flow and enables to connect the PV source directly to the DC-link. The proposed design is accompanied by a specifically developed control method which enables to implement the maximum power point tracking (MPPT) process without the need of any extra power converter, regulate the power flow at each port independently, as well as to control the power flow between its ports. An experimental prototype of the proposed MPC inverter has been constructed and its operation has been validated experimentally under various power flow scenarios.

Solar cell split source inverter for induction motor with computer control

<span lang="EN-US">The electrical energy is necessary for daily life, but there is a continuous increase in the usage rate of electric energy. Such an increase is a big problem, which makes us think about using alternative energy for conventional energy, in addition to the problem of pollution resulting from the use of energy generation. Solar energy is a solution for energy in terms of consumption, besides there is no environmental risk in the use of solar energy. In this work, an integrated solar system operating in the daytime has been designed to operate a 3-phase induction motor (IM). The study begins by simulating the system in the MATLAB/Simulink program in order to find out the results and verify them using the same components of the proposed algorithm. The system with photovoltaic (PV) modules 1080 W, whereas the PV array is a direct source of the designed split source inverter (SSI). This SSI is controlled by sine pulse width modulation (SPWM). The maximum power point tracking (MPPT) incremental conductance (INC) method is monitored by a computer connected to the system via a Wi-Fi connection, the 3-phase IM (373) W. The results reveal the efficiency of the system and that it can be versatile.</span>

Model predictive control based virtual synchronous generator for parallel-connected three-phase split-source converters in islanded AC Microgrids

Due to high penetration of renewable generation in power systems, and the need to provide the interface between distributed energy resources, the split-source inverter (SSI) provides both the boosting and the conversion capabilities in one single-stage. Also the need for converter-based artificial inertia has become more important. In this paper a model-predictive control (MPC) based on virtual synchronous generator (VSG) algorithm for a parallel-connected three-phase SSI is proposed for conceiving regulation of local voltage and realizing power-sharing of an islanded AC microgrid (MG). A virtual synchronous generator (VSG) is deployed to ensure active-power-sharing and provide inertia-emulation and hence reducing the rate of change of frequency (RoCoF) that results from sudden load change. To accomplish a simple control construction, quick dynamic performance, high stability, and enhanced current limitation, a finite-set MPC (FS-MPC) is used. The analysis and modeling of the proposed technique are presented in detail. A simulation model is used to investigate the proposed system performance.

Enhancing power quality in solar-grid integrated systems with ANFIS-based control using split source inverters

Power generation and renewable energy consumption benefit greatly from integrated solar grid systems. However, the intermittent nature of solar electricity and potential voltage swings might raise power quality concerns when solar energy is integrated with the grid. The benefits of the split-source inverter architecture include higher efficiency, lower harmonic distortion, and the ability of power flow in both directions. The ANFIS controller improves the control parameters of the single-stage split-source inverter, eliminating power quality issues including voltage fluctuations, harmonics, and reactive power variations. These difficulties can negatively affect the overall quality of power. ANFIS-based control of the solar-grid integrated system guarantees optimal power conversion, precise voltage management, and higher power quality by intelligently altering the control settings. ANFIS solar electricity and potential voltage swings might raise power quality concerns when solar energy is integrated with the grid. Using an Adaptive Neuro-Fuzzy Inference System (ANFIS)- based control with split source inverters, this research provides a unique method to improve power quality in solar-grid integrated systems. The benefits of the split-source inverter architecture include higher efficiency, lower harmonic distortion, and the ability for power to flow in both directions. The ANFIS controller improves the control parameters of the single-stage split-source inverter, eliminating power quality issues including voltage fluctuations, harmonics, and reactive power variations. These difficulties can negatively impact the power's overall quality. ANFIS-based control of the solar-grid integrated system dynamically adjusts the voltage and current waveforms in response to variations in solar irradiation and grid circumstances. The simulation results show that the harmonic distortion is lowered, voltage stability is enhanced, and reactive power is managed more effectively.

Multidimensional Pulsewidth Modulation for Cascaded Split-Source Inverter

Cascaded split-source inverter (CSSI) is a single-stage modular multilevel structure. This article proposes the multidimensional pulsewidth modulation (MD-PWM) for this topology. All multilevel modulations are a particular version of this approach. The principles of this geometrical method are based on selecting the optimal points and determining the switching sequences and time intervals. By considering the operational principles of CSSI, this method is modified to accurately control the voltage of dc links, charge inductors with constant duty cycles, control dc and ac sides of cells independently, and reduce the reverse recovery effects of input diodes. MD-PWM, with a low computational burden, can be implemented for CSSI with any number of voltage levels. The output power can be distributed equally or unequally among cells, and both buck and boost operation modes are realized for each cell. Also, this method is extended for the operation of the converter with unequal input sources. For an asymmetric topology with <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">N</i> cells, harmonics are located at multiples of <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">N</i> times switching frequency. Thus, this strategy eliminates low-frequency distortions from the output voltage of asymmetric CSSI. The simulation and experimental results verify the performance and accuracy of the proposed technique and mathematical relations.

Modeling and Control of a Voltage-Lift Cell Split-Source Inverter With MPPT for Photovoltaic Systems

Modeling and Control of a Voltage-Lift Cell Split-Source Inverter With MPPT for Photovoltaic Systems

Nonisolated Dual-Output Single-Phase Boost Inverter With Reduced Active and Passive Components

This article proposes a nonisolated dual- output single-phase boost inverter with reduced active and passive components. The suggested inverter can serve two single-phase ac loads independently like two full-bridge inverters, but owing to the use of a pair of three-switch legs in the inverter bridge, it has a 25% reduction in active switches. The proposed inverter is capable of obtaining a boost output voltage while employing fewer passive components compared to the traditional impedance source inverter. And the high-frequency current commutation problem of diodes in the traditional split-source inverter is solved by replacing the diodes with two complimentary switches. A hybrid sinusoidal and constant pulsewidth modulation control strategy is elaborated, which enables the proposed inverter to operate in equal frequency mode and different frequency mode. Comprehensive working principles, modulation strategy, steady-state analysis, and parameter design guideline are introduced, both simulation and experimental results are presented to confirm the characteristics of the proposed topology.