摘要
在发生不对称故障时,主动支撑型储能变流器常采用正、负序分离控制来抑制负序电流,但在对称工况下,正、负序分离与控制环节的延时会恶化电网故障的暂态过程,甚至引发输出电流越限与振荡。针对这一问题,提出基于自适应混合电流控制的主动支撑型储能变流器低电压穿越控制策略。通过分析电网在对称和不对称故障下的差异化特征,设计电网故障类型快速判别方法,据此自适应选择是否执行正、负序分量分离和控制环节,以改善故障发生和恢复阶段的暂态过程。该方法可抑制电网故障电流峰值,减小正、负序分量分离与控制的非必要延时导致的暂态过流风险,提升变流器的低电压穿越能力和电网主动支撑性能。仿真结果验证了所提方法的正确性和有效性。
When an asymmetric gird faults occurs,active support energy storage converters typically employ positive and negative sequence separation control to suppress negative sequence currents.However,under symmetrical operating conditions,the delays introduced by the sequence separation and control processes can exacerbate the transient process of grid faults,potentially causing output current over-limits and oscillations.To address this issue,a low voltage ride-through(LVRT)control strategy based on adaptive hybrid current control for active-supporting converters is proposed.By analyzing the distinct characteristics of symmetric and asymmetric grid faults,a rapid fault type identification method is developed.This enables adaptive selection of whether to execute sequence component separation and control processes,thereby improving transient performance during both fault occurrence and recovery stages.The proposed method not only suppresses grid fault current peaks but also reduces transient overcurrent risks caused by unnecessary delays from sequence component processing,enhancing the converter's LVRT capability and active grid support performance.Finally,simulation results verify the correctness and effectiveness of the proposed methodology.
作者
刘子俊
张宏钊
张林
LIU Zijun;ZHANG Hongzhao;ZHANG Lin(Shenzhen Power Supply Bureau Co.,Ltd.,Shenzhen,Guangdong 518000,China)
出处
《广东电力》
北大核心
2025年第11期75-85,共11页
Guangdong Electric Power
基金
中国南方电网有限责任公司公司科技项目(SZKJXM20222115)。
