针对逆变型新能源场站在电网发生不对称故障时可能出现的电压暂降、电流越限等运行风险,提出一种适用于电压跌落场景的站间协调控制策略,该策略可有效实现故障下多个新能源场站对并网点电压的主动支撑。首先,基于逆变器控制系统的输出特性,分析不对称故障下的电压支撑原理;其次,为了解决输出电流在各新能源场站间的配置问题,引入白鲸优化算法对场站的功率进行优化,并在此基础上推导出相应的参考电流;最后,对电压跌落场景进行区分,在各自场景下通过逆变器注入不同的参考电流以实现并网点电压支撑、电流限幅、改善不平衡度等多个控制目标。在Matlab/Simulink仿真平台上搭建含逆变型新能源场站的并网运行系统,通过仿真模拟验证所提控制策略的有效性。
Abstract
To address the operational risks such as voltage dips and current crossing limits that may occur in inverter-type new energy field stations when asymmetric faults occur in the grid, this paper proposes an inter-station coordination control strategy for voltage dip scenarios, which can effectively realize the active voltage support of multiple new energy sites to the Point of Common Coupling （PCC） under fault. Firstly, based on the output characteristics of the inverter control system, the voltage support principle under asymmetric fault is analyzed. Secondly, in order to solve the configuration problem of the output current among the new energy sites, Beluga Whale Optimization （BWO） algorithm is introduced to optimize the power of the sites, and the corresponding reference current is derived on this basis. Finally, the voltage dip scenarios are distinguished, and different reference currents are injected by the inverters in the respective scenarios to realize multiple control objectives such as voltage support, current limiting, and improvement of unbalance at the parallel network. The grid-connected operation system with inverter-based new energy field stations is built in Matlab/Simulink simulation platform, and the system simulation results verify the effectiveness of the proposed control strategy.
关键词
新能源 /
电压支撑 /
不平衡度 /
协调控制策略 /
功率优化 /
场景区分
Key words
new energy /
voltage support /
unbalance degree /
coordinate control strategy /
power optimization /
scene differentiation
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基金
国网山西省电力公司科技项目（520530200011）; 国家自然科学基金（52081330096）; 上海绿色能源并网工程技术研究中心（13DZ2251900）
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