中文说明：
所谓下垂控制就是选择与传统发电机相似的频率一次下垂特性曲线（Droop Character）作为微源的控制方式，即分别通过P/f下垂控制和Q/V下垂控制来获取稳定的频率和电压，这种控制方法对微网中的微源输出的有功功率和无功功率分别进行控制，无需机组间的通信协调，实现了微源即插即用和对等控制的目标，保证了孤岛下微电网内电力平衡和频率的统一，具有简单可靠的特点。
English Description：
The so-called droop control is to select the frequency droop characteristic curve similar to the traditional generator As the control mode of micro source, the P / F droop control and Q / V droop control are used to obtain stable frequency and voltage respectively. This control method controls the active power and reactive power of micro source output in microgrid respectively without communication and coordination between units. The goal of micro source plug and play and peer-to-peer control is realized, and the power level in microgrid under islanding is ensured The unity of scale and frequency is simple and reliable.