为实现储能系统（ESS）暂态电压支撑潜力的充分利用,提出一种用于储能系统电压暂降支撑的储能逆变器自适应控制策略。首先,深入分析储能系统双向运行下有功功率出力与无功功率容量的自适应变化机理;其次,提出一种考虑无功容量修正下自适应Q-V特性的并网逆变器控制策略,该策略根据储能双向运行下的有功功率出力实时调整无功容量,由无功功率容量确定自适应Q-V下垂系数,并网点电压波动量经自适应Q-V系数增益后,为功率外环提供无功功率参考值,实现储能无功容量的充分利用;最后,基于山东省某实际储能工程和PSCAD环境下的仿真分析,验证所提策略在三相接地故障和无功负荷扰动下能够有效降低电压暂降水平,显著提升系统暂态电压支撑能力,进而改善储能电站的暂态稳定性,保障系统安全可靠运行。
Abstract
To address the problem of lack of transient voltage support capability of the energy storage systems （ESS）, an ESS control strategy considering the adaptive Q-V characteristic of ESS bi-directional operation is proposed. Firstly, the relationship between active power output and adaptive change of reactive power capacity under bi-directional operation of ESS is analyzed theoretically; secondly, an ESS control strategy based on adaptive Q-V characteristic is proposed, which adjusts the reactive power capacity in real time according to the active power output under bi-directional operation of ESS, determines the adaptive Q-V coefficient from the reactive power capacity, and the voltage fluctuation amount of PCC is increased by the adaptive Q-V coefficient. Finally, based on simulation analysis of a practical energy storage project in Shandong Province and PSCAD environment, the proposed strategy was verified. The results indicate that this strategy can effectively reduce the voltage transient level under three-phase ground fault and reactive load disturbance, significantly improve the transient voltage support capability of the system, and then improve the transient stability of the energy storage distribution system to ensure safe and reliable operation of the system.
关键词
储能 /
暂态支撑 /
电压控制 /
自适应控制 /
下垂控制
Key words
energy storage /
transient support /
voltage control /
adaptive control /
droop control
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基金
中国三峡新能源（集团）股份有限公司科研项目（37044032）
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