基于智能负载的光伏并网电压和频率稳定方法研究

将电力弹簧与非关键负载结合形成智能负载后，应用于分布式光伏并网系统中，以平抑入网造成的电压波动与频率偏差。首先分析了SL的工作原理，同时提出一种抑制电压与频率波动的控制方法，然后在Matlab/Simulink仿真平台中搭建含分布式光伏并网的低压馈电系统，在光伏出力波动的条件下仿真验证所提控制策略的有效性。结果表明，智能负载能够有效平抑分布式光伏并网引起的电压和频率波动。

Voltage and Frequency Stabilization Method for Grid-connected Photovoltaic System Based on Smart Load

Smart load（SL）consisting of electric spring and non-critical load（NCL） is used in distributed grid-connected photovoltaic system， to control voltage fluctuation and frequency deviation caused by photovoltaic integration. Firstly， the paper analyzes the working principle of SL， and proposes a control method for suppressing the voltage and frequency fluctuation. Then the paper establishes a low-voltage feed system with the distributed grid-connected photovoltaic system in Matlab/Simulink platform， verifying the effectiveness of the control method through the simulation under the condition of photovoltaic output fluctuation. The results show that the smart load can effectively suppress the voltage and frequency fluctuation caused by the distributed grid-connected photovoltaic generation.