柔性直流配电网暂态电压稳定性控制方法研究  

Transient Voltage Stability Control Method for Flexible DC Distribution Network

作　　者：赵凯 ZHAO Kai(Dagang Oilfield Green Power Company,Tianjin 300280,China)

机构地区：[1]大港油田绿电公司,天津300280

出　　处：《电力与能源》2024年第2期164-168,共5页Power & Energy

摘　　要：由于引起柔性直流配电网暂态电压波动的因素较为复杂,导致对其进行控制时难以达到对电压波动的快速收敛,为此,提出了一种柔性直流配电网暂态电压稳定性控制方法。在考虑电压源换流器、直流母线、分布式电源以及负荷特点的基础上,构建了柔性直流配电网模型,并结合发电机—母线轨迹灵敏度反映发电机出力变化对母线电压波动的影响程度,引入了发电机—母线轨迹灵敏度参数。在具体的控制阶段,结合不同线路对应的发电机-母线轨迹灵敏度情况,对换流器的触发角和导通角进行调节,并利用并联电容器组对柔性直流配电网进行无功补偿,实现暂态电压稳定性控制。在测试结果中,不论是在稳定的电网工作状态还是在电压突变暂态事件状态下,所提出的控制方法均能够实现配电网整体输出电压波动的快速收敛,在短时间内保证电压维持在稳定状态,说明其能够有效保障配电网的稳定运行。Due to the complexity of factors causing transient voltage fluctuations in flexible DC distribution networks,it is difficult to achieve rapid convergence of voltage fluctuations when controlling them.Therefore,a transient voltage stability control method for flexible DC distribution networks is proposed.Based on the characteristics of voltage source converter,DC bus,distributed power supply and load,a flexible DC distribution network model is constructed,and the alternator-bus track sensitivity is introduced to reflect the influence of generator output variation on bus voltage fluctuation.In the specific control stage,the trigger angle and on-angle of the converter are adjusted according to the alternator-bus track sensitivity corresponding to different lines,and the shunt capacitor bank is used to compensate the reactive power of the flexible DC distribution network to realize the transient voltage stability control.In the test results,the control method presented can realize the rapid convergence of the overall output voltage fluctuation of the distribution network,and ensure that the voltage is maintained in a stable state in a short period of time,regardless of the stable working state of the power network or the state of voltage abrupt transient events,indicating that it can effectively guarantee the stable operation of the distribution network.

关 键 词：柔性直流配电网 暂态电压 稳定性控制 无功补偿 

分 类 号：TM89[电气工程—高电压与绝缘技术]