含子模块储能型MMC-STATCOM的直流受端系统稳定性提升OA
Stability Improvement of DC Receiving-end System Using MMC-STATCOM with Energy-storage Submodules
针对高比例新能源并网导致系统电压稳定性下降、惯量支撑不足的问题,提出具备主动支撑能力的采用子模块储能型模块化多电平换流器(MMC)拓扑的静止同步补偿器(STATCOM)控制策略.首先,基于直流电压和系统频率设计了故障检测机制,实现装置稳态与暂态运行模式的自适应切换.其次,在故障期间,控制子模块储能型MMC-STATCOM释放储能单元的能量弥补系统功率缺额;在负荷扰动时,引入频率下垂系数调节储能单元充放电功率,抑制频率波动.最后,在PSCAD/EMTDC以及RTDS仿真平台中对所提协调控制策略进行验证.仿真结果表明,在不同暂态过程中,子模块储能型MMC-STATCOM在提供无功支撑的同时,可快速响应频率变化,平抑系统中的功率波动,有效提升高压直流输电受端系统综合稳定性.
To address the issues related to voltage stability deterioration and inadequate inertia support resulting from high penetration of renewable energy into the power grid,this paper proposes a control strategy for the static synchronous compensator(STATCOM)using the topology of the modular multilevel converter(MMC)with energy-storage submodules.This strategy has the active support capability.First,a fault detection mechanism based on DC voltage and system frequency is proposed to facilitate adaptive switching between steady-state and transient operation modes.Then,during fault period,the MMC-STATCOM with energy-storage submodules is regulated to release energy from the energy storage unit to compensate for a power shortage within the system.In response to load disturbances,a frequency droop coefficient is used to regulate the charging and discharging power of the energy storage unit,thereby mitigating frequency fluctuations.Finally,the proposed coordinated control strategy is verified through PSCAD/EMTDC and RTDS simulations.The simulation results show that the MMC-STATCOM with energy-storage submodules can promptly respond to frequency variations during various transient processes,while simultaneously providing reactive power support,smoothing power fluctuation within the system,and significantly enhancing the comprehensive stability of the high-voltage DC transmission receiving-end system.
丁超蕃;王曦;李保宏;江琴;石鹏;刘天琪
四川大学电气工程学院,四川省成都市 610065国网四川省电力公司电力科学研究院,四川省成都市 610041四川大学电气工程学院,四川省成都市 610065四川大学电气工程学院,四川省成都市 610065国网四川省电力公司电力科学研究院,四川省成都市 610041四川大学电气工程学院,四川省成都市 610065
直流受端系统暂态稳定性静止同步补偿器子模块储能模块化多电平换流器电压支撑频率支撑
DC receiving-end systemtransient stabilitystatic synchronous compensator(STATCOM)submoduleenergy storagemodular multilevel converter(MMC)voltage supportfrequency support
《电力系统自动化》 2026 (11)
73-84,12
四川省自然科学基金资助项目(2025ZNSFSC0450)国家电网有限公司科技项目(52199725000B). This work is supported by Sichuan Provincial Natural Science Foundation of China(No.2025ZNSFSC0450)and State Grid Corporation of China(No.52199725000B).
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