自适应灵敏度的配电网分布式电源无功控制

摘要

分布式电源(DG)的大量接入,使配电网潮流变得复杂.为减小分布式电源对配电网电压的影响并充分利用分布式设备的剩余容量,文章提出一种自适应灵敏度的分布式电源本地无功控制策略.各节点利用逆变器的控制计算能力获取自身的无功-电压灵敏度,并根据灵敏度的大小配置节点的Q(U)控制曲线,使所有节点较为均衡地参与无功控制,提高了系统的无功调节能力.采用IEEE33节点配电网测试系统对所提控制策略进行了仿真验证.结果表明,在发生节点电压越限时,所提控制策略下测试系统的电压调节能力和总无功补偿能力优于传统Q(U)控制策略.%The access of a large number of distributed generations(DGs)will result in complicated power flows in dis?tribution network.To reduce the effect of the access of DGs on the voltage of distribution network and further make full use of the residual capacity of distributed equipment,a control strategy of local reactive power in DGs is proposed based on self-adaptive sensitivity,under which each node obtains its own reactive power-voltage sensitivity by the control and computing capability of inverters,and the Q(U)control curve is configured according to the obtained sensitivity,which makes every node participate in the reactive power control in a more balanced way and thus improves the system's reac?tive power regulation capability.The proposed strategy is simulated and verified on an IEEE 33-bus distribution net?work test system,and results show that when the nodal voltage off-limits occur,the voltage regulation capability and total reactive power compensation capability of the test system are better under the proposed strategy than those under the tra?ditional Q(U)control strategy.