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A Mode-switching Strategy of droop control for VSC-MTDC Systems Considering Maximum DC Voltage Regulation Capability

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 903-912页

作者： Yizhen Wang Fengliang Qiu Zhongguan Wang Yirun Ji Zhengguang Chen Chengshan Wang Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China Electric Power Research Institute of State Grid JiBei Electric Power Co.Ltd. Beijing 100045China State Grid Corporation of China Beijing 100031China IEEE

To achieve the goal of carbon neutrality,renewable energy integration through a voltage source converter based multi-terminal direct current(VSC-MTDC)system has been identified as a promising *** tackle the significant DC voltage over-limit problem in a VSC-MTDC system during disturbances,this paper proposes a mode-switching strategy of droop control considering maximum DC voltage regulation *** close relationship between node injection powers and node DC voltages in the MTDC system is elaborated,and the most effective regulation approach of local injection power for limiting DC voltage deviation is *** operating point trajectories of different droop control explains that the DC voltage deviation can be minimized by fully utilizing the capacity of ***,the mode-switching strategy with the maximum DC voltage regulation capability is realized by the switching between the voltage droop control and the constant maximum power *** addition,a mode recovery process and a smooth switching method are developed to make converters regain the capability of maintaining DC voltage and reduce power fluctuation during mode switching,***,three cases are investigated to verify the effectiveness of the proposed mode-switching *** with simulation results of the conventional droop control and the DC voltage deviation-dependent droop control,better performance of transient and steady-state DC voltage deviation is achieved through the proposed strategy.

关键词： droop control maximum DC voltage regulation capability mode-switching VSC-MTDC

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droop control method for load share and voltage regulation in high-voltage microgrids

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Journal of Modern Power Systems and Clean Energy 2016年第1期4卷 76-86页

作者： Zhikang SHUAI Shanglin MO Jun WANG Z.John SHEN Wei TIAN Yan FENG National Power Transformation and control Engineering Technology Research Center Hunan UniversityChangsha 410082China Electrical and Computer Engineering Illinois Institute of TechnologyChicagoIL 60616USA

When the line impedance is considered in the microgrid, the accuracy of load sharing will decrease. In this paper, the impact of line impedance on the accuracy of load sharing is analyzed. A robust droop control for a highvoltage microgrid is proposed based on the signal detection on the high-voltage side of the coupling transformer. For a high-voltage microgrid, the equivalent impedance of coupling transformer connecting distributed generator with the grid is usually the dominate factor. Compared with the conventional droop control strategy, the proposed control method in this paper detects the feedback signal from the high-voltage side of the coupling transformer. The impact of line impedance on the load sharing accuracy can be mitigated significantly. The proposed droop control only changes the detection point of the feedback signal, thus it is easy to be implemented. The PSCAD/EMTDC simulation results show the effectiveness of the proposed robust droop control concept in load sharing and voltage regulation with highly accuracy.

关键词： Microgrid High-voltage Coupling transformer droop control Accreted load sharing Voltage regulation

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Small-signal Analysis of DC Microgrid and Multi-objective Optimization Segmented droop control Suitable for Economic Dispatch

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Journal of Modern Power Systems and Clean Energy 2020年第3期8卷 564-572页

作者： Haiyuan Liu Yingjie Wang Min Wang Yinan Guo Jiashi Wang Gang Shen Guoqiang Liao School of Information and control Engineering China University of Mining and TechnologyXuzhou 221000China School of Electrical and Power Engineering China University of Mining and TechnologyXuzhou 221000China School of Mechanical Engineering China University of Mining and TechnologyXuzhou 221000China CRRC Zhuzhou Locomotive Co. Ltd.Zhuzhou 412001China

To obtain a larger controllable range of output/input power of droop-control sources,a multi-objective optimization segmented droop control suitable for economic dispatch for a DC microgrid is *** to the small-signal analysis,the worst point of the stability in the droop-control curve is determined through the analysis of a simplified model with multiple droop-control *** considering the worst points of stability as constraints,an elitist non-dominated sorting genetic algorithm is used to search the better turning points of the proposed droop-control curves after obtaining the new rated operation points from the system-layer economic ***,optimization objectives,including the influence of eliminating the line resistance and capacity matching,are considered in the search ***,the simulation results of the DC microgrid simulation model based on RT-Lab are presented to support the stability conclusion and proposed droop control.

关键词： Small signal DC microgrid droop control elitist non-dominated sorting genetic algorithm(NSGA-П)

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droop control for Micro-grid Operations Including Generation Cost and Demand Side Management

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CSEE Journal of Power and Energy Systems 2017年第3期3卷 232-242页

作者： Dulal Manna Swapan K.Goswami Pranab K.Chattopadhyay Electrical Engineering Department Jadavpur UniversityKolkata 700098India

A new cost-based droop control method based upon generation cost and demand side cost management of the microgrid is proposed in this *** present,many droop control methods have been developed based on either the power rating or the generation cost of the distributed generation(DG)unit,without consideration of the demand side participation in the operation and *** exclusion might not be appropriate,if different types of consumers are connected in the micro-grid *** study proposes a droop control method considering both DG and load operating cost characteristics in order to minimize the generation cost of the micro-grid.

关键词： Distributed generation droop control generation cost micro-grid operation optimization of demand cost function

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Research on power control strategy of household-level electric power router based on hybrid energy storage droop control

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Protection and control of Modern Power Systems 2021年第1期6卷 178-190页

作者： Kun Huang Yanman Li Xiaoyan Zhang Lei Liu Yanbin Zhu Xin Meng NARI Technology Development Co. LtdNo.19Chengxin AvenueJiangning DistrictNanjing CityJiangsu ProvinceChina Nari Group Corporation/State Grid Electric Power Research Institute No.19Chengxin AvenueJiangning DistrictNanjing CityJiangsu ProvinceChina School of Physics University of OxfordOxfordOX13RHUK Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin300072China

In the light of user-side energy power control requirements, a power control strategy for a household-level EPR based on HES droop control is proposed, focusing on the on-grid, off-grid and seamless switching process. The system operating states are divided based on the DC bus voltage information with one converter used as a slack terminal to stabilize the DC bus voltage and the other converters as power terminals. In the on-grid mode, the GCC and the HES are used as the main control unit to achieve on-grid stable operation, whereas in the off-grid mode, the PV, HES and LC are used as the main control unit at different voltages to achieve stable operation of the island network. Finally, a DC MG system based on a household-level EPR is developed using the PSCAD / EMTDC simulation platform and the results show that the control strategy can effectively adjust the output of each subunit and maintain the stability of the DC bus voltage.

关键词： Household-level electric power router Hybrid energy storage droop control On-grid mode Off-grid mode

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A Power Allocation Method for Grid-Connected MMC Inverter Based on droop control

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Chinese Journal of Electrical Engineering 2016年第2期2卷 84-91页

作者： Fei Rong Zhangtao Yin Zhikang Shuai Shoudao Huang College of Electrical and Information Engineering Hunan UniversityChangsha410082China

droop control has been widely used for controlling distributed *** capacity of the MMC inverter may be insufficient,a power allocation method for grid-connected MMC inverter based on droop control is presented to improve the stability of the power *** there is potential for large disturbances in the power grid,an equal speed regulation strategy is adopted to make the speed of the voltage collapse be the same as the frequency *** obtaining the active and reactive power references of MMC inverter according to equal speed regulation strategy,the deadbeat control method is calculated using these power references and adopted to track the reference *** Routh criterion is used to analyze the influence of the inductance measurement error on the control ***,a simulation model is established with Matlab and *** simulation results show that the stability of the power grid has been improved with the proposed control method.

关键词： MMC droop control power allocation equal speed regulation deadbeat control

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Research on the Impacts of the Inertia and droop control Gains from a Variable-Speed Wind Turbine Generator on the Frequency Response

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Energy Engineering 2022年第2期119卷 539-554页

作者： Dejian Yang Yien Xu Tong Zhu Yang Wang Qiuhan Cao Yuang Ma Enshu Jin Xinsong Zhang Haochen Sun School of Electrical Engineering Nantong UniversityNantongChina School of Electrical Engineering Northeast Electric Power UniversityJilinChina Transcell Technology NanjingChina

System frequency must be kept very close to its nominal range to ensure the stability of an electric power *** system frequency variations are able to result in load shedding,frequency instability,and even generator *** increasing wind power penetration,there is rising concern about the reduction in inertia response and primary frequency control in the electric power ***-based wind generation is capable of providing inertia response and primary frequency response;nevertheless,the primary frequency and inertia responses of wind generation are different from those of conventional synchronous fleets;it is not completely understood how the primary frequency and inertia responses affect the given system under various disturbances and available kinetic energy *** are used to investigate the influences of inertia and droop control strategies on the dynamic frequency responses,particularly the index of the second frequency drop under various disturbance and wind conditions.A quantitative analysis provides insight into setting of inertia and droop control coefficients for various wind and disturbance conditions to facilitate adequate dynamic frequency responses during frequency events.

关键词： Wind power inertia control droop control frequency stability

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Interface Passivation for DC Converters under Voltage droop control

Interface Passivation for DC Converters under Voltage Droop ...

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第37届中国控制会议

作者： Hongqiao Deng Ji Xiang College of Electrical Engineering Zhejiang University

Voltage droop control is one of the most commonly used control strategies for DC microgrids in islanded *** patterns and time-varying structure of DC microgrids affect the effectiveness of voltage droop control. In this paper,interface passivation is studied according to the fact that the stability of DC microgrids is ensured as long as the individual converter has a passive interface. The passivation designs for buck converters have been presented to ensure that they have a passive interface under voltage droop control. Sufficient conditions on controller parameters are given. The proposed design is validated through the simulation results.

关键词： DC microgrid interface passivation droop control

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Asymmetrical Fault Current Calculation Method and Influencing Factors Analysis of droop-controlled Inverters

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 562-573页

作者： Huimin Zhao Zhikang Shuai Jun Ge An Luo Weimin Wu Z.John Shen College of Electrical and Information Engineering Hunan UniversityChangsha 410006China Electrical Engineering Department Shanghai Maritime UniversityShanghai 201306China Department of Electrical and Computer Engineering Ilinois Institute of TechnologyChicagoIL 60616 USA

Since the fault dynamic of droop-controlled inverter is different from synchronous generators (SGs), protection devices may become invalid, and the fault overcurrent may damage power electronic devices and threaten the safety of the microgrid. Therefore, it is imperative to conduct a comprehensive fault analysis of the inverter to guide the design of protection schemes. However, due to the complexity of droop control strategy, existing literatures have simplified asymmetric fault analysis of droop-controlled inverters to varying degrees. Therefore, accurate fault analysis of a droop-controlled inverter is needed. In this paper, by analyzing the control system, an accurate fault model is established. Based on this, a calculation method for instantaneous asymmetrical fault current is proposed. In addition, the current components and current characteristics are analyzed. It was determined that fault currents are affected by control loops, fault types, fault distance and nonlinear limiters. In particular, the influences of limiters on the fault model, fault current calculation and fault current characteristics were analyzed. Through detailed analysis, it was found that dynamics of the control loop cannot be ignored, the fault type and fault distance determine fault current level, and part of the limiters will totally change the fault current trend. Finally, calculation and experimental results verify the correctness of the proposed method.

关键词： Asymmetrical fault analysis droop control fault current calculation method limiter transient fault characteristics

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Distributed power conditioning unit of large-scale space solar power station

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Chinese Journal of Aeronautics 2024年第8期37卷 421-434页

作者： Xintong LI Jianwei MI Yiqun ZHANG Guanheng FAN Jie DU School of Mechano-electronic Engineering Xidian UniversityXi’an 710071China Shaanxi Key Laboratory of Space Solar Power Station System Xidian UniversityXi’an 710071China Academy of Advanced Interdisciplinary Research Xidian UniversityXi’an 710071China

In this paper,a multi-bus distributed Power Conditioning Unit(PCU)is proposed for the Space Solar Power Station with large scale photovoltaic(PV)array and power levels reaching MW *** this unit,there are multiple independent PV *** each PV array,there are multiple independent PV *** this paper,a V-P droop control method with adaptive droop coefficient is proposed,which modifies the droop intercept based on the bus voltage deviation and the power per unit value of the PV *** method ensures the accuracy of bus voltage and achieves proportional distribution of power between PV arrays based on the proposed topology structure in this *** the load changes or the output power of the PV array fluctuates,this method can ensure that power is distributed *** principle and control method of the proposed droop control method is analyzed in this *** effectiveness of the method is verified through MATLAB/Simulink simulation and *** and experimental results show that the proposed method can achieve power distributed proportionally when load changes and PV output power fluctuates,reduce bus voltage error caused by line impedance and differences in rated power of different PV arrays,and improve the performance of PV power generation system applied to space.

关键词： Space Solar Power Station Photovoltaics droop control DC confluence Power conditioning unit

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