摘要
电网电压中通常含有一定分量的谐波,会导致网侧电流出现谐波分量而发生畸变,网侧电压谐波分量和电流的正序分量相互作用还将使网侧变换器输出的有功功率、无功功率产生6倍频波动。为提高光伏空调系统中网侧变换器的运行性能,在电网电压畸变条件下建立网侧变换器正负序分量数学模型,利用以5次和7次谐波电流分量为零的控制方法,实现维持直流母线电压恒定、消除网侧变换器5次和7次谐波电流的控制目标。并基于光伏空调系统仿真平台进行验证,结果及分析表明此控制策略能够有效改善光伏空调系统的网侧电流谐波及系统控制性能。
A certain harmonic in the grid voltage will result in the output current dis-tortion of the grid-connected inverter. The interaction between the grid voltage harmonic and current positive sequence component will result in six times frequency fluctuation of ac-tive and reactive power output from the grid-connected inverter. In order to improve the operation performance of the grid-connected inverter of the PV air-conditioning system , one mathematical model of positive ＆ negative sequence component for grid-connected inverter is established under grid voltage distortion conditions. With a control method of ensuring the 5 th or 7 th current harmonic as zero, the DC bus voltage keeps stable and the 5 th or 7 th current harmonic of grid-connected inverter is eliminated. The effectiveness of the control strategy for improving the current harmonic of grid-connected inverter and system control performance are verified based on PV air-conditioning system simulation platform.
出处
《制冷与空调》
2018年第1期12-16,共5页
Refrigeration and Air-Conditioning
关键词
光伏室调系统
电网电压谐波
并网电流畸变
陷波器
PV air-conditioning system
grid voltage harmonic
grid current distortion
notch filter
