随着风电大规模并网,电网频率稳定成为不可忽略的关键问题之一,双馈风电机组可通过释放、存储旋转动能参与平抑系统频率波动,改善系统频率稳定性。不同运行工况下,双馈风电机组释放、存储旋转动能的能力存在差异,基于此,该文量化分析释放、存储旋转动能的能力,提出一种可变增益的系统频率波动平抑策略,即低频偏移时,控制增益设定为风电机组旋转动能释放能力的一次函数;高频偏移时,控制增益设定为风电机组旋转动能存储能力的一次函数,该策略在避免频率波动平抑能力不足和过度调节的同时,实现对频率波动平抑的自主控制,基于EMTP-RV软件平台的仿真实验验证了该文所提频率波动平抑控制策略的有效性。
Abstract
With the large-scale grid-connection of wind power, the stability of grid frequency has become one of the key problems that cannot be ignored. Doubly-fed induction generators （DFIGs） can mitigate the frequency fluctuations by releasing the kinetic energy from the DFIG and storing the kinetic energy into the DFIG, thus improving the frequency stability. The energy-releasing and energy-storing capabilities are different when DFIGs are operating in various speed conditions. Therefore, this paper suggests employing different variable gains during over-frequency and under-frequency periods, respectively. During the under-frequency period, the control gain is set to a linear function of the energy-releasing capability; during the over-frequency period, the control gain is set to a linear function of the energy-storing capability; and thereby mitigating frequency fluctuation and avoiding the issues of insufficient and excessive mitigation of frequency fluctuation. This paper established a test power system with DFIGs based on an EMTP-RV simulator. Simulation results indicate that the proposed strategy is valid.
关键词
风力发电 /
频率稳定 /
双馈风电机组 /
动能释放能力 /
动能储存能力 /
时变增益
Key words
wind power /
frequency stability /
DFIGs /
energy-releasing capability /
energy-storing capability /
variable gain
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基金
国家自然科学基金（51907106）; 江苏省高校自然科学基金（20KJB470026）
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