Compensation Capacity Research Articles

Study on Reactive Compensation Strategy and Compensation Capacity Control of Metro Power Supply System

Study on Reactive Compensation Strategy and Compensation Capacity Control of Metro Power Supply System

Collaborative compensation strategy of electrified railways and DFIG-based wind farm for suppressing voltage unbalance

Single-phase traction loads of electrified railways have aroused the worst voltage unbalance (VU) problem in a weak remote grid, where possesses a number of wind farms (WFs). To utilize the compensator capacity effectively, this paper focuses on VU compensation effort sharing for traction power supply system (TPSS) and WF. Firstly, to achieve the stable VU compensation of point of common coupling (PCC), a VU propagation model is proposed to reveal the VU contribution of TPSS and WF, which provides a compensation target. Then, in terms of the VU active compensation ability of double fed induction generotor (DFIG), a negative sequence current (NSC) optimal compensation model is established under constraints of stable operation limits. Furthermore, a collaborative control strategy with the objective of VU limit at PCC is presented to provide reference current for TPSS and WF. Finally, simulation results are carried out to verify the effectiveness of the proposed strategy, and the compensator capacity of TPSS can be reduced by 18% when the active compensation ability of WF is taken into account.

Development of Hot Air Dryer Conveyor for Automotive Tampo Printing Parts

This paper presents the development of a hot air dryer conveyor for the automotive industry in the tampo printing part process. The research started by designing and creating the actual device that is ready to use and be implemented in the industry. The method provides the detail of the drying chamber, hot air dryer, and its mathematical model. The chosen hot air dryer is Suiden SHD-9F II and is operated on the factory default setting of auto-tuning mode. The performance evaluation studies the indicator performance of hot air dryer for the chosen size of drying chamber, the robustness of the system against fluctuating environmental air change rate, the ducting capacity, and the damper opening value estimation performance. The result of this system is working well at specification requirement of air change rate from 15 to 21 at 80% of its maximum capacity for error compensation and its already being successfully implemented.

An Optimal Zero-Sequence Voltage Injection Strategy for DVR Under Asymmetric Sag

This article introduces an optimal zero-sequence voltage injection strategy (OZVIS) for the three-phase dynamic voltage restorer (DVR), which can effectively reduce the output voltage magnitude of DVR in case of asymmetric sags in a three-phase, three-wire power system, so as to improve the compensation capacity of the device. The conventional compensation strategy improves the active power or reduces the voltage amplitude of the DVR through phase rotation, but the two functions are difficult to achieve together. In this article, the operation principle of OZVIS is first introduced. Then, the optimality and effectiveness of the strategy are theoretically demonstrated by means of a plane geometric modeling approach. In addition, the reduction extent using OZVIS in different voltage sag types is quantified, which is based on the minimum energy compensation strategy. Furthermore, a digital “plug-in” algorithm implementation for the proposed strategy is elaborated. Finally, the experimental results will be shown to verify the feasibility and effectiveness of OZVIS under an asymmetric situation. Moreover, the adaptability under a symmetric situation will also be illustrated.

하이브리드 능동전력필터의 전력품질 개선을 위한 Coordinate Transformation 기법에 대한 성능 비교

In this paper, the performances of Coordinate transformation method for harmonic and reactive power compensation of hybrid active power filters were compared and analyzed. Recently, as the spread of power electronic devices is expanding, the occurrence of harmonics in the system is increasing, and the harmonics have a bad effect on the system and electrical equipment. As a measure against such harmonics, the parallel resonance problem of passive power filters among filters can be solved, and a hybrid active power filter with a small compensation capacity of the active power filter can be considered. However, In order to control the hybrid active power filter to the required power factor, it is necessary to control it through fast tracking even when the load changes. Therefore, in this paper, the performance was analyzed by applying the p-q theory method and the compensation current control method using d-q respectively to the hybrid active power filter. As a result of comparing and analyzing the effects through simulation, it was confirmed that using the p-q theory method quickly followed the target value with a relatively small error even with a variable load than using the d-q method.

Research on the design and influence of unit generation capacity adequacy guarantee mechanism in the power market

With the advancement of power system reform and the improvement of renewable energy penetration, the situation of power generation enterprises and the generation capacity adequacy of power system are facing challenges. It is urgent to ensure reliable power supply in the market through new evaluation methods and guarantee mechanisms. Firstly, this paper proposes an evaluation method of generation capacity adequacy for multi-types units, which quantitatively calculates the adequacy capacity of each unit and the generation capacity adequacy of the system. Secondly, this paper designs a unit capacity compensation mechanism adapted to the initial stage of Power Market construction, which includes capacity pricing model, compensation capacity quota model, capacity fee settlement model. Among them, the capacity pricing model considers the investment cost of marginal units operating during annual peak load, while the compensation capacity quota model considers the actual generation capacity of units and the actual demand of the system. Finally, this paper takes a certain region of China as an example to verify the effectiveness and adaptability of the mechanism. The results show that the capacity adequacy guarantee mechanism designed in this paper can effectively reflect the overall level of power system generation capacity adequacy, fairly distinguish the reliability value of various generation units, help power generation enterprises recover fixed costs within the planned investment payback period and ensure the system generation capacity adequacy.

Evaluation of Nd0.8-x Sr0.2Ca x CoO3-δ (x = 0, 0.05, 0.1, 0.15, 0.2) as a cathode material for intermediate-temperature solid oxide fuel cells.

A series of Nd0.8−xSr0.2CaxCoO3−δ(x = 0, 0.05, 0.1, 0.15, 0.2) cathode materials was synthesized by sol–gel method. The effect of Ca doping amount on the structure was examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermal expansion, and X-ray photoelectron spectroscopy (XPS). Electrochemical properties were evaluated for possible application in solid oxide fuel cell (SOFC) cathodes. Results showed that second phase NdCaCoO4+δ is generated when the Ca doping amount is higher than 0.1. The increase in Ca limits the electronic compensation capacity of the material, resulting in a decrease in thermal expansion coefficient (TEC). With the increase of Ca content, the conductivity increases at first and then decreases, and the highest value of 443 S cm−1 is at x = 0.1 and T = 800 °C. Nd0.7Sr0.2Ca0.1CoO3−δ exhibits the lowest area specific resistance of 0.0976 Ω cm2 at 800 °C. The maximum power density of Nd0.7Sr0.2Ca0.1CoO3−δ at 800 °C is 409.31 mW cm−2. The Ca-doped material maintains good electrochemical properties under the coefficient of thermal expansion (CTE) reduction and thus can be used as an intermediate-temperature SOFC (IT-SOFC) cathode.

Coordinated Control Strategy for Harmonic Compensation of Multiple Active Power Filters

In order to minimize the harmonic distortion rate of the current at the common coupling point, this paper proposes a coordinated allocation strategy of harmonic compensation capacity considering the performance of active power filters (APF). On the premise of proportional distribution of harmonic compensation capacity, the harmonic compensation rate of each APF is considered, and the harmonic current value of each APF to be compensated is obtained. At the same time, the communication topology is introduced. Each APF takes into account the compensation ability of other APFs. Finally, three APFs with different capacity and performance are configured at the harmonic source to suppress the same harmonic source, and the harmonic distortion rate is reduced to 1.73%. The simulation results show that the strategy can effectively improve the compensation capability of the multiple APF cascaded system to the power grid without increasing the installed capacity.

Influence of Magnetic State Variation on Transformer Core Vibration Characteristics and Its Measurement

The variation of magnetic state of transformer often causes the violent vibration of the transformer various parts, especially the core. The most obvious magnetic state change of the transformer is usually caused by the DC component. In this paper, one kind of magnetic compensation method is adopted to suppress the DC bias, and the core vibration caused by the transformer magnetic state change is studied in detail. At first, on the basis of measuring the magnetostriction and calculating the vibration displacement of transformer core, the research on the vibration increment created by the DC bias is carried out. Secondly, the transformer core vibration before and after the DC bias suppression is simulated, and the difference of the transformer with a magnetic compensation capacity is analyzed. Finally, based on the VIBXPERT®II FFT data acquisition and signal analyzer, the vibration of measuring points under the different magnetic state and the different measuring point under the same magnetic state are collected. The vibration tendency of each measuring point is given with the variation of the magnetic state. Thus, the vulnerable spot of the core vibration and the basic law of the transformer vibration are obtained, which could provide a basic method for the reducing vibration.

Allocation Control of Multi-functional Grid Connected Inverter and the Power Quality between of Grid Connected Microgrid Based on PSCAD Simulation Platform

On the one hand, the application of microgrid can effectively cut down the effect of distributed generation on distribution network, on the other hand, it helps to improve the power quality of distribution network. However, for the distribution network, a single multi-functional inverter has limited effect on the improvement of its power quality. Therefore, the allocation control of power quality by decentralized multi-functional inverters can further improve the utilization of inverters. This paper proposes to calculate the output current of multiple multi-functional inverters according to the harmonic and reactive current of the parallel node and the residual capacity of the multi-functional inverter. The simulation results show that the allocation control strategy proposed in this paper can effectively control the compensation capacity of the multi-functional inverter, so as to control the harmonic at the grid connection in place.

Distributed Reactive Power Compensation Method in DC Traction Power Systems With Reversible Substations

This paper proposes a potential distributed reactive power compensation method in dc traction power systems with reversible substations. It utilizes the entire capacity of reversible substations during night hours and the reminding capacity except for regenerative braking energy feedback during day hours. A unified dispatch scheme is developed to allocate reactive power compensation capacity for each reversible substation. During night hours the entire capacity is used to accomplish the optimal power flow objective. During day hours the excess capacity after active power production is used to improve the system reactive power factor dynamically. The different objectives throughout the day are implemented in a unified formula which avoids manually change. In addition the outage of reversible substations and the low dc voltage conditions are considered and an over-modulation suppression strategy is included in the unified dispatch scheme to adjust the reactive power allocation among reversible substations. This novel utilization method of reversible substations is able to provide significant improvements in the power factor of dc traction power systems which would otherwise require expensive additional equipment such as static synchronous compensator. Finally the effectiveness of the proposed method is verified with MATLAB/SIMULINK.

A model for the evaluation of groundwater ecological compensation budget

Groundwater, one of the important water resources, plays an important role in maintaining sustainable social and economic development. The ecological compensation of groundwater is a beneficial tool for guaranteeing reasonable exploitation and utilization of groundwater resources. However, there is a lack of associated studies, especially compensation budget. We proposed an integrated groundwater compensation standard model, which consisted of four components: base, stimulus and punishment, research and development, and potential risk. The priority level of compensation was estimated by considering regional climate and economic conditions comprehensively. The model was applied to a total of 11 cities in Shanxi Province to calculate the groundwater ecolo-gical compensation standard. The results showed that the base compensation accounted for the largest proportion in the total compensation, with the non-market value contributing more than 60%. Our results indicated that groundwater had a high regulated service value. From 2008 to 2017, the development coefficient of each city had significantly increased, suggesting the improved regional economic level and enhanced compensation capacity. Compensation priority was affected by the non-market value of groundwater and economic level, and obvious difference in the compensation priority existed in all the cities, implying the requirement for the implement of groundwater ecological compensation. Meanwhile, we suggested that groundwater risk compensation system should be improved, special funds should be set up for supporting research projects on groundwater ecological compensation, and long-term effective compensation mechanisms should be established.

A scalable and reconfigurable hybrid AC/DC microgrid clustering architecture with decentralized control for coordinated operation

Microgrid clusters are effective to increase utilization of renewable energy resources (RESs), and improve reliability and stability of power systems. Facilitating flexible configurations, grid networking and coordinated operation among multiple microgrids are essential for the microgrid cluster. In view of this, this paper presents a scalable and reconfigurable hybrid microgrid clustering architecture and a corresponding decentralized control method. Initially, a new interlinking converter referred as energy networking unit (ENU) is proposed. The ENU is used to interface the AC and DC subgrid in single hybrid microgrid, and also facilitates the connection with the external power grid. Then the ENU-based hybrid microgrid clustering architecture is established, which is characterized by scalability, reconfigurability and modularity. Thanks to the reconfigurable topology of ENUs, the architecture could realize flexible AC/DC interconnection between microgrids by the same converter modules with less power conversion units. Finally, a proposed decentralized control strategy for this architecture could realize autonomous power exchange between subgrids in single microgrid with considering energy storage restrictions and smooth mode switch. And an adaptive and autonomous power interaction among neighboring microgrids is also achieved with full utilization of the compensation capacity of clusters, thus improving the system reliability, as well as the utilization and local consumption of RESs. The effectiveness of the proposed clustering architecture and decentralized control strategy is verified by comprehensive cases.

P97. The risk of proximal junctional kyphosis increases with greater preoperative thoracic kyphosis in the elderly patient

BACKGROUND CONTEXT Despite improvements in spinal deformity techniques, proximal junctional kyphosis and proximal junctional failure continue to be challenging complications after adult spinal deformity surgery, particularly in the elderly patient. To date, there are few ASD studies evaluating radiographic risk factors for PJK in the elderly patient, who may have significant higher baseline thoracic kyphosis and lower capacity for thoracic compensation. PURPOSE To identify radiographic risk factors for proximal junctional kyphosis preoperatively in elderly patients. STUDY DESIGN/SETTING Retrospective review of prospectively collected single center database. PATIENT SAMPLE There were 155 patients > 70 years of age who were followed for more than two years and underwent ASD surgery were included (Age: 75 ± 4 y; mFI: .84 ± .76; Levels fused: 9.3 ± 5.1). OUTCOME MEASURES We investigated the rate of proximal junctional kyphosis at 2 year follow-up. METHODS Patients were divided into PJK and non-PJK groups based on accepted radiographic criteria using whole spine standing radiographs. Radiographic risk factors for development of PJK were assessed using multivariate analysis. RESULTS The cohort had sagittal malalignment as demonstrated by PT 32.2 ± 10.2°, PI–LL 27.4 ± 20.0°, TPA 38.4 ± 12.3°, and SVA 127.7 ± 69.6 mm. Mean PI for the cohort was 56.3 ± 13.5°, mean TK was 33.5 ± 17.8°, mean expected TK was 35.9 ± 14.4°, and mean thoracic compensation was 2.3 ± 21.9°. The PJK and non-PJK groups comprised 82 and 73 cases, respectively. No differences were seen in the incidence of PJK with preoperative thoracic kyphosis < 20° (21%) , 20-30° (34%), or 30-40° (48%), however a significantly higher rate was seen with a preoperative TK ≥40° (63%) (p<0.05). There was no significant difference in thoracic compensation between patients who developed PJK (1.6 ± 20.1°), and those who did not (3.1 ± 20.4°). The amount of change in TK before and just after surgery was significantly associated with PJK (PJK: 20.5 ± 21.9°, no PJK: 4.4 ± 30°, p<0.0001) and was a significant risk factor for PJK by regression analysis (OR 1.064, p < 0.0001). CONCLUSIONS Elderly patients (> 70 years) have a low level of thoracic compensation and those with preoperative kyphosis > 40° are at higher risk for development of PJK. Greater change in thoracic kyphosis before and just after surgery was a significant predictor of PJK. FDA DEVICE/DRUG STATUS This abstract does not discuss or include any applicable devices or drugs. Despite improvements in spinal deformity techniques, proximal junctional kyphosis and proximal junctional failure continue to be challenging complications after adult spinal deformity surgery, particularly in the elderly patient. To date, there are few ASD studies evaluating radiographic risk factors for PJK in the elderly patient, who may have significant higher baseline thoracic kyphosis and lower capacity for thoracic compensation. To identify radiographic risk factors for proximal junctional kyphosis preoperatively in elderly patients. Retrospective review of prospectively collected single center database. There were 155 patients > 70 years of age who were followed for more than two years and underwent ASD surgery were included (Age: 75 ± 4 y; mFI: .84 ± .76; Levels fused: 9.3 ± 5.1). We investigated the rate of proximal junctional kyphosis at 2 year follow-up. Patients were divided into PJK and non-PJK groups based on accepted radiographic criteria using whole spine standing radiographs. Radiographic risk factors for development of PJK were assessed using multivariate analysis. The cohort had sagittal malalignment as demonstrated by PT 32.2 ± 10.2°, PI–LL 27.4 ± 20.0°, TPA 38.4 ± 12.3°, and SVA 127.7 ± 69.6 mm. Mean PI for the cohort was 56.3 ± 13.5°, mean TK was 33.5 ± 17.8°, mean expected TK was 35.9 ± 14.4°, and mean thoracic compensation was 2.3 ± 21.9°. The PJK and non-PJK groups comprised 82 and 73 cases, respectively. No differences were seen in the incidence of PJK with preoperative thoracic kyphosis < 20° (21%) , 20-30° (34%), or 30-40° (48%), however a significantly higher rate was seen with a preoperative TK ≥40° (63%) (p<0.05). There was no significant difference in thoracic compensation between patients who developed PJK (1.6 ± 20.1°), and those who did not (3.1 ± 20.4°). The amount of change in TK before and just after surgery was significantly associated with PJK (PJK: 20.5 ± 21.9°, no PJK: 4.4 ± 30°, p<0.0001) and was a significant risk factor for PJK by regression analysis (OR 1.064, p < 0.0001). Elderly patients (> 70 years) have a low level of thoracic compensation and those with preoperative kyphosis > 40° are at higher risk for development of PJK. Greater change in thoracic kyphosis before and just after surgery was a significant predictor of PJK.

Total renal volume and renal function after radical nephrectomy in renal neoplasm

IntroductionThe reduction of renal mass after radical nephrectomy (RN) for renal neoplasm, could be associated with compensatory hypertrophy of the contralateral kidney. The capacity of compensation will determine the renal function (RF) evolution. Measuring of total renal volume (TRV) of the remaining kidney pre and post RN can help assess the RF evolution. ObjectivesTo determine the correlation between TRV pre and post nephrectomy (a year of follow-up) with RF. Materials and methodsA retrospective cohort study was carried out in 47 patients who had undergone RN from 2014 to 2018, due to renal cell carcinoma (confirmed by histopathology).The TRV was calculated, pre and post (a year of follow-up) RN, using ellipsoid formula equation, which were compared with clinical and analytical data. The results were analyzed by multivariate linear logistic models. ResultsThe median age at the time of RN was 70 years old (range, 40–88 years). Most of them were men, 66%. The estimated glomerular filtration rate (eGFR) pre and post nephrectomy was 78 (40–100) and 53.3ml/min/m2 (30–90) respectively (p=0.01). The TRV pre and post-nephrectomy was 168.2ml (100.4–257.2) and 187.8ml (115.5–273.1) respectively (p=0.001).The pre-nephrectomy eGFR (β=0.62; p=0.034) and the TRV (β=1.08; p<0.0001) were positively correlated with the post-nephrectomy TRV, while the eGFR at year of follow-up was correlated negatively (β=−1.18; p=0.047). ConclusionsThe measurement of pre and post nephrectomy TRV can help to predict renal function evolution at a year of follow-up.

Study on drying bamboo shoots by Sasaki heat pump drying technology

The study was conducted to investigate the effects of blanching regimes at the salt concentration and drying temperature using Sasaki heat pump drying technology on the quality of dried bamboo shoots to create a product that can be kept color, flavour, and quality. Fresh bamboo shoots were cut into slices with a thickness of 6 mm, boiled in hot saltwater at 100oC at different concentrations (0, 1, 3, 5%) for 15 minutes. Then, they were dried in the temperature setting differences (30, 40, 50oC) by Sasaki dryers and tested for moisture, color, cyanide content, microorganisms, water compensation capacity, and product sensory quality. Fresh bamboo shoots were boiled in hot saltwater at 100oC, 3% salt concentration for 15 minutes, and dried at 40oC by Sasaki drier for the best quality. This treatment mode provides the lowest color variation and the best water compensation compared to other treatment modes. Dried bamboo shoots are bright yellow, uniform color, characteristic odour, toughness with little deformation, low cyanide content, and microbiological content below the threshold of food hygiene and safety.

Adaptive optics for dynamic aberration compensation using parallel model-based controllers based on a field programmable gate array.

Adaptive optics (AO) is an effective technique for compensating the aberrations in optical systems and restoring their performance for various applications such as image formation, laser processing, and beam shaping. To reduce the controller complexity and extend the compensation capacity from static aberrations to dynamic disturbances, the present study proposes an AO system consisting of a self-built Shack-Hartmann wavefront sensor (SHWS), a deformable mirror (DM), and field programmable gate array (FPGA)-based controllers. This AO system is developed for tracking static and dynamic disturbances and tuning the controller parameters as required to achieve rapid compensation of the incoming wavefront. In the proposed system, the FPGA estimates the coefficients of the eight Zernike modes based on the SHWS with CameraLink operated at 200 Hz. The estimated coefficients are then processed by eight parallel independent discrete controllers to generate the voltage vectors to drive the DM to compensate the aberrations. To have the DM model for controller design, the voltage vectors are identified offline and are optimized by closed-loop controllers. Furthermore, the controller parameters are tuned dynamically in accordance with the main frequency of the aberration as determined by a fast Fourier transform (FFT) process. The experimental results show that the AO system provides a low complexity and effective means of compensating both static aberrations and dynamic disturbance up to 20 Hz.

Effects of weekend starvation and the duration of daily feeding on production parameters of rainbow trout Oncorhynchus mykiss

It would often be practical to starve the cultivated fishes over the weekends, e.g. to save in labour costs. We evaluated the possibility that domesticated juvenile rainbow trout (Oncorhynchus mykiss) could compensate for the lost growth of the 2-day weekend starvation by either hyperphagic response and/or by lower feed conversion ratio, compared to the fish fed every day in an 8-week experiment. Rainbow trout (initial weight c. 30 g, temperature 16 °C) starved during the weekends were able to increase feed intake during the weekdays clearly above the intake of the control fish after the first two weekends, also seen as an increase of the compensation coefficients over the last four weeks of the experiment. However, the control fish had significantly greater total absolute feed intake than the fish in the treatment group inducing significantly higher specific growth rate and final weight (176.7 ± 4.7 g) compared to the treatment group (153.1 ± 8.4 g) at the end of the experiment. The coefficient of variation of weight did not differ between the two groups, but the feed conversion ratio was significantly higher in the 2-day starving group (0.93 ± 0.03) than in the control group (0.88 ± 0.01). Growth compensation was only partial, and our data indicated clear differences in the capacity for compensation between the tanks. The tank-wise compensation capacity appears to be rather persistent, seen as a significant positive correlation in the compensation coefficients between the first and last four weeks of the experiment. Body moisture and hepatosomatic index were significantly higher in the 2-day starving groups than in the control group, but there were no treatment differences in stomach capacity (weight or volume), liver weight or in the relative amount of visceral fat. The lack of the increase in stomach capacity in the treatment group fish was hypothesized to be a consequence of selective breeding for several decades and being an unnecessary trait in farmed fishes supplied feed constantly. We conducted also a 3-week follow-up experiment to test the effects of feeding frequency (continuous feeding vs. feeding twice per day) on growth responses in rainbow trout experiencing the weekend starvation, and these results confirmed that the lack of full growth compensation in the first experiment was not due to feeding frequency. Our results suggest that weekend starvation cannot be recommended for domesticated rainbow trout without negatively affecting their growth.

Active and Reactive Power Collaborative Optimization for Active Distribution Networks Considering Bi-Directional V2G Behavior

Due to their great potential for energy conservation and emission reduction, electric vehicles (EVs) have attracted the attention of governments around the world and become more popular. However, the high penetration rate of EVs has brought great challenges to the operation of the Active Distribution Network (ADN). On the other hand, EVs will be equipped with more intelligent chargers in the future, which supports the EVs’ high flexibility in both active and reactive power control. In this paper, a distributed optimization model of ADN is proposed by employing the collaborative active and reactive power control capability of EVs. Firstly, the preference of EV users is taken into account and the charging mode of EVs is divided into three categories: rated power charging, non-discharging, and flexible charging–discharging. Then, the reactive power compensation capacity of the plugged-in EV is deduced based on the circuit topology of the intelligent charger and the active–reactive power control model of the EV is established subsequently. Secondly, considering the operation constraints of ADN and the charging–discharging constraints of EVs over the operation planning horizon, the optimization objective of the model is proposed, which consists of two parts: “minimizing energy cost” and “improving voltage profile”. Finally, a distributed solution method is proposed based on the Alternating Direction Method of Multipliers (ADMM). The proposed model is implemented on a 33-bus ADN. The obtained results demonstrate that it is beneficial to achieve lower energy cost and increase the voltage profile of the ADN. In addition, the energy demand of EV batteries in their plugin intervals is met, and the demand preference of EV users is guaranteed.

Research on the dynamic characteristics of water hydraulic servo valves considering the influence of steady flow force

The International Thermonuclear Experimental Reactor remote-handling (ITER-RH) system powered by water hydraulics is a vision of the future. The 2D servo valve is a new type of servo valve, maybe suitable for the ITER-RH system. It has many advantages, including its fast response and strong anti-pollution ability. However, steady flow force is currently considered to be one factor that impacts the dynamic characteristics of servo valves. In this study, the influence of steady flow force on the dynamic characteristics was analyzed, and the structure was optimized accordingly. A mathematical model of the servo valve was built using theoretical analysis and numerical simulation. Results indicated that the amplitude bandwidth of the 2D water hydraulic servo valve was 169 Hz without considering the steady flow force, and it decreased to 162 Hz when the steady flow force was considered. Furthermore, a newly designed valve sleeve, to compensate for the axial steady flow force, was proposed by changing the angle of the inlet port designed in the valve sleeve to the spool axis. The maximum compensation capacity of the axial steady flow force was 35%, and the best angle of the inclined holes was approximately 120°. The optimized amplitude bandwidth of the 2D servo valve was 167 Hz. The results demonstrate that the optimized valve sleeve improved the dynamic response of the 2D servo valve.