中文摘要：

在多分布式电源（distributedgenerations，DGs）并联糸统中，通常采用传统下垂控制实现负荷分配。由于线路阻抗和本地负荷的影响，传统下垂控制会产生较大的功率分配误差。为提高功率分配的精确性，提出了一种自动调节下垂系数的控制策略。各逆变器在传统P-V下垂控制下，将输出有功功率信息送到中央控制器，计算给定功率，并返回给各逆变器本地控制器，通过PI调节器自动调节各自的P-V下垂系数。仿真和实验结果验证了该策略的可行性。

英文摘要：

In a parallelly operated system composed of multi distributed generations （DGs）, traditional droop control is usually utilized for load distribution. Due to the influences of feeder impedances and local load, a larger power distribution error may be caused by traditional droop control. To improve the accuracy of power distribution, a control strategy, which can automatically adjust the droop coefficients, is proposed. Under the control of traditional P-V droop control, all inverters send the information of active power outputs to the central controller and then the central controller calculates the specified power for each inverter and sends the calculated results to each local controller of all inverters, and the P-V droop coefficient of each inverter is automatically adjusted respectively by the PI controller. Results of simulation and experiments show that the proposed control strategy is feasible.