摘要
因电网动态电流和电压的变化难以控制,且电压不对称问题修正过程干扰因素过多,提出一种电网稳定控制方法。根据动力守恒定律建立电网功率输出模型,分别计算在有、无功率输出时电网运行相关量的正、负序量值,将其作为电网稳定控制阈值。考虑到电网故障分为电压变化、电流变化以及运行功率变化三个阶段,采用无功注入方式补偿出现故障时既定电压的差值会出现空缺问题,设置逆变输出器,控制故障电流的跌落值,完成电网稳定的控制。经仿真证明,当电网出现电压不对称故障时,电网的360个测试点经过研究方法控制后电压、电流均回到了稳定阶段,整体波形变化相对平稳没有出现过高或过低的幅值,电网实现高效稳定运行。说明所提方法对电压、电流的稳定控制效果好,鲁棒性较强,实用价值更高。
Due to the difficulty in controlling the changes in dynamic current and voltage in the power grid,and the excessive interference factors in the correction process of voltage asymmetry,a power grid stability control method is proposed.According to the law of dynamic conservation,we built a model for power output,and calculated the positive and negative sequence values during the operation of power grid with and without power output as the threshold of power grid stability control.Considering that the power grid faults can be divived into three stages:voltage change,current change and operating power change,we used the reactive power injection to compensate for the vacancy caused by the difference of the rated voltage in case of fault.Moreover,we set an inverter output to control the drop value of fault current and thus to complete the control for power grid stability.Through simulation,it has been proven that when a voltage asymmetry occurs in the power grid,the voltage and current of 360 test points in the power grid return to being stable after being controlled by the proposed method,and the overall waveform changes smoothly,without any over high or low amplitude.In addition,the power grid is efficient and stable.It shows that the method has good control effect on voltage and current stability,strong robustness and higher utility.
作者
杨清鹏
吕飞鹏
YANG Qing-peng;LV Fei-peng(College of Electrical Engineering,Sichuan University,Chengdu Sichuan 610041,China)
出处
《计算机仿真》
北大核心
2023年第12期119-122,166,共5页
Computer Simulation
基金
国家自然科学基金项目资助(51907097)。
关键词
电压不对称故障修正
动力守恒规律
正、负序量值
逆变器
Correction for voltage asymmetry fault
Dynamic conservation law
Positive and negative sequence values
Inverter
