不对称电网故障下直流母线电压平衡控制方法  

A Control method of DC Bus Voltage Balance under Asymmetric Power Grid Fault

作　　者：邢阳阳 马冬梅 党晓圆 关正伟 XING Yang-yang;MA Dong-mei;DANG Xiao-yuan;GUAN Zheng-wei(College of Intelligent Engineering,Chongqing College of Mobile Communication,Chongqing 401520,China)

机构地区：[1]重庆移通学院智能工程学院,重庆401520

出　　处：《计算机仿真》2023年第5期162-165,196,共5页Computer Simulation

基　　金：重庆市教委科学技术重点项目(KJZD-K202002401)。

摘　　要：由于在不对称电网故障下直流母线电压不稳定,导致馈入电网的功率发生振荡,对电网的危害较大。提出一种新的直流母线电压平衡控制方法。通过分析光伏电池的等效电路,获取光伏模块相关参数,构建光伏阵列数学模型;采用锁相环技术自动检测跟踪到光伏阵列的最大功率点,并检测电网相位;根据检测结果,采用电压下垂控制方法,结合恒定的滞环宽度获取瞬时电感的电流波形,完成直流母线输出电压的平衡控制。仿真结果表明,在不对称电网故障下使用设计的直流母线电压平衡控制方法的电压波动幅度比传统方法下的波动幅度小,控制效果较好。Due to the instability of DC bus voltage under asymmetric grid failure,the power fed into the grid os-cillates,causing great harm to the power grid.Therefore,a new method to control DC bus voltage balance was pro-posed.By analyzing the equivalent circuit of photovoltaic cells,relevant parameters of photovoltaic modules were ob-tained,and then a mathematical model of the photovoltaic array was constructed.Moreover,phase-locked loop tech-nology was used to automatically detect the maximum power point of the photovoltaic array and the phase of the power grid.According to test results,the voltage droop control method was combined with the constant hysteresis width to obtain the current waveform of instantaneous inductance and thus to complete the balance control for the output voltage of the DC bus.Simulation results show that the voltage fluctuation amplitude of the proposed method under the asymmetric failure of gird is smaller than that of the traditional method,so its control effect is better.

关 键 词：不对称电网故障 电压平衡控制 直流母线 

分 类 号：TM614[电气工程—电力系统及自动化]