摘要
并网光伏系统应具备无功功率独立控制能力。分析逆变器发出无功功率最大容量的约束条件,基于两相静止坐标系建立光伏并网系统有功功率、无功功率的控制策略框图。采用基于并网点电压幅值的Q(U)无功功率控制策略,光伏逆变器根据其并网点电压幅值独立调节无功功率输出,抑制并网点电压越限。最后,以Matlab/Simulink仿真和RT-LAB实验验证了理论分析的正确性。
Grid-connected photovoltaic（PV） system should have independent control of reactive power. Analyzing the constraint con- dition of inverter reactive power, this paper constructs the overall control diagram of active power and reactive power of PV sys- tem. By using a Q（U） strategy of reactive power based on voltage amplitude at the point of common coupling （PCC）, the PV invert- er can independently regulate its reactive power output according to the voltage amplitude, and thus suppress the voltage at PCC within certain limits. Finally, the simulation in Matlab/Simulink and experiment based on RT-LAB are carried out to verify the correctness of the theoretical analysis.
出处
《南方电网技术》
2013年第6期94-98,共5页
Southern Power System Technology
关键词
并网光伏逆变器
无功功率独立控制
两相静止坐标系
电压越限
无功功率约束
PV inverter
independent control of reactive power
stationary reference frame
voltage beyond limits
reactive powerconstraint
