虚拟同步发电机及其在独立型微电网中的应用

摘要

针对独立分布式发电系统设计了一种基于同步发电机功角特性的虚拟同步发电机控制策略,使逆变器能以电压源形式与柴油发电机并联组网.所设计的控制策略实现了逆变器对电网的无缝投切,逆变器在并网运行时能根据指令调节有功输出.突加、突减负载时逆变器能迅速响应需求输出功率,有效地减小了微电网电压幅值和频率波动.当微电网中柴油发电机停机时逆变器能独立支撑微电网的电压和频率,使微电网电压和电流平稳过渡.最后通过MATLAB/Simulink仿真验证了所设计控制策略的有效性.%Aim to the independent distributed power generation system,a virtual synchronous generator control strategy based on the power angle characteristic of synchronous generator was designed.The inverter could run in the form of voltage source with the diesel generator in parallel.The designed control strategy realized the seamless switching of inverter to micro grid.When in operation,the inverter could both adjust the active output power according to the instruction and respond to the power demand quickly when the load was changed.The control strategy could effectively reduce the fluctuation of voltage amplitude and frequency of the micro grid.The voltage and frequency could be independently supported by the inverter when the diesel generator shut down in microgrid,ensure the micro power grid running smoothly.At last,through the MATLAB/Simulink simulation verified the effectiveness of the designed control strategy.