摘要
通过对传统的三相光伏并网控制系统进行分析,要实现光伏并网逆变器交流侧电网的功率因数为1,就要使光伏并网q轴无功电流分量保持为0,基于这一理念对传统的控制方法进行了改进:去掉了外环电压控制环节,让d轴有功电流分量直接跟踪表示三相电流通用相量的模值。在Matlab/Simulink环境下建立仿真模型,对改进的控制策略进行仿真验证,仿真结果表明该方案在实现并网控制目标的同时,控制系统简单,控制代价小。
By analyzing control system of three-phase photovoltaic grid-connection, it is necessary to make the ^-axis component of reactive current of photovoltaic grid-connection to equal 0 for realizing that grid power factor of AC side of grid-connection inverter is equal to 1. The traditional control method is improved according to this conclusion： it removes control link of the outer loop voltage, making the d-axis component of active current directly track amplitude indicating three-phase current general phasor. In the Matlab/Simulink, a simulation model was created to verify improve control strategy, and simulation results indicate that the method can realize grid-connection control objective, meanwhile control system is simple and the control cost is low.
出处
《电源技术》
CAS
CSCD
北大核心
2014年第7期1298-1301,共4页
Chinese Journal of Power Sources
关键词
三相光伏并网
并网逆变器
双环控制
dq坐标变换
通用相量模值
three-phasephotovoltaicgrid-connection
grid-connectioninverter
double loop control
dq coordinate transformation
general phasor amplitude
