有源阻尼可显著提高变流器对弱电网的适应能力，然而，利用公共连接点(point of common coupling, PCC)点谐波电压进行有源阻尼控制时对系统背景谐波电压抑制能力的影响较大。为此，提出了一种基于PCC点谐波电压和并网电流的加权有源阻尼策略。文中基于系统误差传递关系分析了加权阻尼策略在提高变流器弱电网适应能力方面的有效性，并利用电网电压至系统误差的传递函数比较了加权和传统阻尼控制下系统的背景谐波电压抑制能力，结果表明，加权阻尼策略在提高变流器弱电网适应能力的同时可减小阻尼控制对系统背景谐波电压抑制能力的影响，提高并网电流质量。最后利用PLECS仿真验证了所得结果的正确性。
英文摘要:
Active damping can significantly improve the adaptability of converter to weak grid, however, when the PCC (point of common coupling) voltage harmonics are used for active damping control, the suppression ability of the system on the background harmonic voltages will be greatly affected. Therefore, a weighted active damping strategy based on PCC voltage harmonics and grid-injected current is proposed. The effectiveness of the weighted damping strategy to improve the adaptability of converter to weak grid is analyzed based on the transmission relation of the system error. Moreover, for the weighted and traditional damping strategy, the suppression abilities of the system on the background harmonic voltages are compared based on the transfer function from the grid voltage to system error. The results show that, the weighted damping strategy can improve the adaptability of converter to weak grid and reduce the effect of the damping control on the suppression ability of the system on the background harmonic voltages simultaneously. Hence, the quality of the grid-connected current can be improved. Finally, the correctness of the above results is verified by the PLECS simulation.