含静止同步补偿器的光伏并网系统静态同步稳定分析

doi:10.19595/j.cnki.1000-6753.tces.240754

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Abstract PV systems are typically equipped with reactive power compensation devices when connected to the grid, and static synchronous compensator (STATCOM) devices are widely employed due to their flexible control capabilities. The increasing utilization of power electronic devices in the power grid has resulted in a shift from physical synchronization to control synchronization as the dominant mode of system operation. Analyzing static synchronization stability problem is more challenging for these systems compared to conventional power systems, as converter output characteristics are influenced by control strategies. Therefore, it is imperative to urgently address the problem of static synchronization stabilization under control strategy dominance.
First, this paper establishes the static synchronous stability analysis model of the grid-connected converter based on the control loop and circuit structure of each converter in a parallel system under the respective dq reference frame. The dq reference frame of the converter is determined by the phase information provided by the control loop in a multiple converter parallel system, thus enabling a unified coordinate system for static synchronization stability analysis. Subsequently, an equivalent small signal model is developed for analyzing multiple grid-connected converters. In comparison with existing coordinate conversion methods, Kirchhoff's current law is incorporated to enhance accuracy and reduce errors.
Then, the stability criterion for impedance analysis is enhance, and the static grid-synchronization performance indices are created. The small perturbation oscillation characteristics are measured using overshooting and regulation time, while the participation factor is employed to analyze the impact of each pole of the system. Finally, the attenuation coefficient is utilized to assess static synchronization stability performance.
The model is developed in Matlab/Simulink for simulation verification. Subsequently, an analysis is conducted on the impact of parameters such as the control loop parameters and STATCOM capacity on static synchronization stability. The main conclusions are summarized as follows:
(1) Optimizing the reactive power output of the grid-connected converter based on known control parameters can significantly enhance static synchronization stability performance, with the dominant influence of small perturbations after oscillation mode being attributed to poles generated by phase-locked loop control.
(2) The attenuation coefficient of the system exhibits a rapid increase in proximity to the critical stability region. Hence, it is imperative for the system to possess a certain margin of attenuation coefficient during operation. Based on the simulation analysis results presented in this study, static synchronous instability phenomena occur when the attenuation coefficient of the PV system exceeds 300. Conversely, when the attenuation coefficient falls below 250, the system remains in a state of static synchronous stability. These findings establish a criterion for analyzing and assessing static synchronization stability within such systems.
(3) The addition of STATCOM to the PV system primarily impacts the conductance matrix transfer function of the q-coupled channel. The phase-locked-loop coupling oscillations between the grid-connected converters do not affect the dd channel. Within the stable operating region, an increase in bandwidth for the DC voltage control loop, active current control loop, and reactive current control loop results in an amplification of both attenuation coefficient and system oscillation amplitude.
(4) When the phase-locked loop parameters of the STATCOM are the same as the PV system, the stability performance of the system is mainly affected by the grid impedance and the equivalent conductance transfer function of each grid-connected converter. And each grid-connected converter can independently connect to the grid and achieve stable operation to ensure that the system achieves static synchronous stability in this case.
(5) In cases where the active output of the PV system is low, STATCOM typically adjusts its capacitive or inductive reactive power provision to improve static synchronization stability performance. Conversely, when compensating for capacitive reactive power, utilizing STATCOM may yield superior results compared to using the PV grid-connected converter alone. Hence, allocating an optimal capacity for STATCOM can significantly enhance static synchronization stability performance.

Key words： PV system static synchronous compensator (STATCOM) static synchronization stability impedance analysis method attenuation coefficient

Received: 10 May 2024

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TM712

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	Ma Ruicong
	Cao Yongji
	Zhang Hengxu
	Li Changgang

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Ma Ruicong,Cao Yongji,Zhang Hengxu等. Static Synchronization Stability Analysis of PV Grid-Connected System with Static Synchronous Compensator[J]. Transactions of China Electrotechnical Society, 2025, 40(11): 3410-3426.

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[1] 韩应生, 孙海顺, 秦世耀, 等. 电压源型双馈风电并网系统小扰动低频稳定性分析[J]. 电工技术学报, 2023, 38(5): 1312-1324, 1374.
Han Yingsheng, Sun Haishun, Qin Shiyao, et al.Low-frequency stability analysis of voltage-sourced doubly-fed wind power grid-connected system under small disturbance[J]. Transactions of China Electrotechnical Society, 2023, 38(5): 1312-1324, 1374.
[2] 汪春江, 孙建军, 宫金武, 等. 并网逆变器与电网阻抗交互失稳机理及阻尼策略[J]. 电工技术学报, 2020, 35(增刊2): 503-511.
Wang Chunjiang, Sun Jianjun, Gong Jinwu, et al.Mechanism and damping strategy of interactive instability between grid-connected inverter and grid impedance[J]. Transactions of China Electrotechnical Society, 2020, 35(S2): 503-511.
[3] 曹永吉, 吴秋伟, 张恒旭, 等. 考虑分时电价和最大暂态频率偏移的储能机会约束优化配置[J]. 电力系统自动化, 2023, 47(2): 61-68.
Cao Yongji, Wu Qiuwei, Zhang Hengxu, et al.Chance-constrained optimal configuration for energy storage system considering time-of-use price and maximum transient frequency deviation[J]. Automation of Electric Power Systems, 2023, 47(2): 61-68.
[4] 马睿聪, 邹世豪, 曹永吉, 等. 基于灵敏度分析的同步调相机及其励磁系统参数分类辨识方法[J]. 电力系统保护与控制, 2024, 52(4): 26-37.
Ma Ruicong, Zou Shihao, Cao Yongji, et al.Sensitivity analysis-based classification and identification method of a synchronous condenser and its excitation system parameter[J]. Power System Protection and Control, 2024, 52(4): 26-37.
[5] 罗魁, 郭剑波, 王伟胜, 等. 跟网型新能源附加频率控制对频率稳定及小扰动同步稳定影响分析综述[J]. 中国电机工程学报, 2023, 43(4): 1261-1280.
Luo Kui, Guo Jianbo, Wang Weisheng, et al.Review of impact of grid following variable renewable energy supplementary frequency control on frequency stability and small-disturbance synchronization stability[J]. Proceedings of the CSEE, 2023, 43(4): 1261-1280.
[6] San Guocheng, Zhang Wenlin, Luo Ran, et al.Small-signal multi-frequency model for grid-connected inverter system with PWM effect[J]. CSEE Journal of Power and Energy Systems, 2020, 6(2): 307-317.
[7] Yu Jiale, Qi Yang, Deng Han, et al.Evaluating small-signal synchronization stability of grid-forming converter: a geometrical approach[J]. IEEE Transactions on Industrial Electronics, 2022, 69(9): 9087-9098.
[8] 胡祺, 付立军, 马凡, 等. 弱电网下基于锁相控制并网变换器小扰动同步稳定分析[J]. 中国电机工程学报, 2021, 41(1): 98-108.
Hu Qi, Fu Lijun, Ma Fan, et al.Small signal synchronizing stability analysis of PLL-based VSC connected to weak AC grid[J]. Proceedings of the CSEE, 2021, 41(1): 98-108.
[9] Wen Bo, Dong Dong, Boroyevich D, et al.Impedance-based analysis of grid-synchronization stability for three-phase paralleled converters[J]. IEEE Transactions on Power Electronics, 2016, 31(1): 26-38.
[10] Mansour M Z, Mohammed N, Ravanji M H, et al.Output impedance derivation and small-signal stability analysis of a power-synchronized grid following inverter[J]. IEEE Transactions on Energy Conversion, 2022, 37(4): 2696-2707.
[11] 郝艺, 周瑀涵, 刘晨曦, 等. 含跟网型储能的新能源多馈入系统小扰动电压支撑强度分析[J]. 电工技术学报, 2024, 39(11): 3569-3580.
Hao Yi, Zhou Yuhan, Liu Chenxi, et al.Small-disturbance voltage support strength analysis for renewable multi-infeed system with grid-following energy storage[J]. Transactions of China Electro-technical Society, 2024, 39(11): 3569-3580.
[12] 宗皓翔, 张琛, 吕敬, 等. MMC多入多出阻抗及其在不对称小扰动稳定分析中的应用[J]. 中国电机工程学报, 2022, 42(15): 5649-5664.
Zong Haoxiang, Zhang Chen, Lü Jing, et al.MMC MIMO impedance and its application in the asymmetric small-signal stability analysis[J]. Proceedings of the CSEE, 2022, 42(15): 5649-5664.
[13] 艾力西尔·亚尔买买提, 辛焕海, 宫泽旭, 等. 锁相环主导下变流器振荡问题的阻抗分析方法:标称性与鲁棒性[J]. 中国电机工程学报, 2024, 44(15): 6035-6047.
Yaermaimaiti Ailixier, Xin Huanhai, Gong Zexu, et al.Impedance analysis method of oscillation issues in converter caused by phase-locked loop: nominal performance and robustness[J]. Proceedings of the CSEE, 2024, 44(15): 6035-6047.
[14] Zhang Chen, Føyen S, Suul J A, et al.Modeling and analysis of SOGI-PLL/FLL-based synchronization units: stability impacts of different frequency-feedback paths[J]. IEEE Transactions on Energy Conversion, 2021, 36(3): 2047-2058.
[15] 宫泽旭, 艾力西尔·亚尔买买提, 辛焕海, 等. 新能源电力系统并网设备小扰动稳定分析(一): 机理模型与稳定判据适用性[J]. 中国电机工程学报, 2022, 42(12): 4405-4418.
Gong Zexu, Yaermaimaiti Ailixier, Xin Huanhai, et al.Small signal stability analysis of equipment in renewable energy power system (part Ⅰ): mechanism model and adaptation of stability criterion[J]. Proceedings of the CSEE, 2022, 42(12): 4405-4418.
[16] 宫泽旭, 艾力西尔·亚尔买买提, 辛焕海, 等. 新能源电力系统并网设备小扰动稳定分析(二): 导出机理与稳定性分类探讨[J]. 中国电机工程学报, 2022, 42(14): 5126-5139.
Gong Zexu, Yaermaimaiti Ailixier, Xin Huanhai, et al.Small signal stability analysis of grid-connected equipment in power system (part Ⅱ): discussion on mechanism derivation and classification of stability[J]. Proceedings of the CSEE, 2022, 42(14): 5126-5139.
[17] 康勇, 林新春, 郑云, 等. 新能源并网变换器单机无穷大系统的静态稳定极限及静态稳定工作区[J]. 中国电机工程学报, 2020, 40(14): 4506-4515.
Kang Yong, Lin Xinchun, Zheng Yun, et al.The static stable-limit and static stable-working zone for single-machine infinite-bus system of renewable-energy grid-connected converter[J]. Proceedings of the CSEE, 2020, 40(14): 4506-4515.
[18] 曹永吉, 张恒旭, 施啸寒, 等. 规模化分布式能源参与大电网安全稳定控制的机制初探[J]. 电力系统自动化, 2021, 45(18): 1-8.
Cao Yongji, Zhang Hengxu, Shi Xiaohan, et al.Preliminary study on participation mechanism of large-scale distributed energy resource in security and stability control of large power grid[J]. Automation of Electric Power Systems, 2021, 45(18): 1-8.
[19] 王凯, 原熙博, 王晖, 等. 弱电网下逆变器并网系统失稳的两种诱因[J]. 电网技术, 2023, 47(3): 1230-1241.
Wang Kai, Yuan Xibo, Wang Hui, et al.Two causes of the inverter-based grid-connected system instability in weak grids[J]. Power System Technology, 2023, 47(3): 1230-1241.
[20] 詹长江, 吴恒, 王雄飞, 等. 构网型变流器稳定性研究综述[J]. 中国电机工程学报, 2023, 43(6): 2339-2358.
Zhan Changjiang, Wu Heng, Wang Xiongfei, et al.An overview of stability studies of grid-forming voltage source converters[J]. Proceedings of the CSEE, 2023, 43(6): 2339-2358.
[21] 王冠中, 董炜, 辛焕海, 等. 基于广义短路比的电力电子多馈入系统小干扰概率稳定评估[J]. 电力系统自动化, 2018, 42(18): 17-24.
Wang Guanzhong, Dong Wei, Xin Huanhai, et al.Probabilistic stability evaluation of small disturbances for power electronic multi-infeed system based on generalized short-circuit ratio[J]. Automation of Electric Power Systems, 2018, 42(18): 17-24.
[22] Ni Kai, Gan Chun, Hu Yihua, et al.Input-output small-signal stability analysis of a PLL-free direct power-controlled partially power-decoupled more-electric shipboard propulsion system[J]. IEEE Transactions on Transportation Electrification, 2021, 7(3): 1672-1686.
[23] Chen Yahong, Xu Wei, Liu Yi, et al.Small-signal system frequency stability analysis of the power grid integrated with type-II doubly-fed variable speed pumped storage[J]. IEEE Transactions on Energy Conversion, 2023, 38(1): 611-623.
[24] 曾德银, 姚骏, 张田, 等. 虚拟同步发电机多机并联系统的频率小信号稳定性分析研究[J]. 中国电机工程学报, 2020, 40(7): 2048-2061.
Zeng Deyin, Yao Jun, Zhang Tian, et al.Research on frequency small-signal stability analysis of multi-parallel virtual synchronous generator-based system[J]. Proceedings of the CSEE, 2020, 40(7): 2048-2061.
[25] Mansour M Z, Ravanji M H, Karimi A, et al.Small-signal synchronization stability enhancement of grid-following inverters via a feedback linearization controller[J]. IEEE Transactions on Power Delivery, 2022, 37(5): 4335-4344.
[26] 李红, 梁军杨, 王振民, 等. 跟网型变换器的小扰动同步稳定机理分析与致稳控制[J]. 电工技术学报, 2024, 39(12): 3802-3815.
Li Hong,Liang Junyang,Wang Zhenmin,et al.Small signal synchronization stability analysis and improved control strategy for grid following converter[J]. Transactions of China Electrotechnical Society, 2024, 39(12): 3802-3815.
[27] Sajadi A, Zhao Shuang, Clark K, et al.Small-signal stability analysis of large-scale power systems in response to variability of offshore wind power plants[J]. IEEE Systems Journal, 2019, 13(3): 3070-3079.
[28] 马富艺龙, 辛焕海, 刘晨曦, 等. 新能源基地柔性直流送出系统小扰动电压支撑强度评估[J]. 电工技术学报, 2023, 38(21): 5758-5770, 5938.
Ma Fuyilong, Xin Huanhai, Liu Chenxi, et al.Small-disturbance system voltage support strength assessment method for renewables VSC-HVDC delivery system[J]. Transactions of China Electrotechnical Society, 2023, 38(21): 5758-5770, 5938.
[29] 张宇, 张琛, 蔡旭, 等. 并网变换器的暂态同步稳定性分析: 稳定域估计与镇定控制[J]. 中国电机工程学报, 2022, 42(21): 7871-7883.
Zhang Yu, Zhang Chen, Cai Xu, et al.Transient grid-synchronization stability analysis of grid-tied voltage source converters: stability region estimation and stabilization control[J]. Proceedings of the CSEE, 2022, 42(21): 7871-7883.