多重电枢风电系统无电网电压传感器的并网逆变

Parallel Grid-Connected Inverters for Multiple Armature-Winding Wind Power System without Grid Voltage Sensors

以提高并网逆变器可靠性和降低成本为目的,采用基于虚拟电网磁链定向的无电网电压传感器的矢量控制策略;为了提高风电系统可靠性和容错能力,采用多重电枢直流侧电压并联运行的控制方案.详细分析单套逆变器数学模型和控制策略,实现两套逆变器并联运行并网.实验结果表明,三相并网逆变器输出电流正弦度良好,同时具有较好的动、静态特性,从而验证了方案的可行性和正确性.

The control strategy based on virtual power grid flux without power grid voltage sensors is proposed to improve reliability and reduce cost for the grid-connected inverter.A novel control strategy makes the DC voltage flexibly run in parallel based on multiple armature-winding,making the system more reliable and robust.Experimental results show that output currents are sinusoidal,with a good dynamic and static performance.Thus feasibility of the control strategy is verified.