配电网多太阳能光伏系统分布式协调控制策略

Distributed Coordinated Control Strategy for Multi⁃solar⁃photovoltaic System in Distribution Network

针对配电网中光伏系统大量增加所引起的配电系统电压快速变化问题,提出了一种针对多住宅太阳能光伏系统的分布式递阶控制策略。首先,利用基于下垂度的初级电平控制,调节PV逆变器的电压,克服配电系统电压的快速变化。其次,运用基于Agent的分布式次级控制,生成具有相邻Agent分布式通信的电压校正项,从而实现平均母线电压恢复和无功功率按比例分配。最后,通过实验仿真分析,验证所提控制策略的有效性。实验结果表明:所提控制策略能够实时补偿光伏发电的不确定性,具有良好的光伏系统电压控制效果,并对大负载变化、有功功率变化和Agent故障具有较高的鲁棒性,可有效提高配电系统的稳定性。

Aiming at the problem of rapid voltage variation of distribution system due to massive increase of photovoltaic systems in the distribution network,a kind of distributed hierarchical control strategy for multi⁃residential solar photovoltaic systems is proposed.Firstly,the primary level control based on the sag is used to adjust the voltage of the PV inverter so to overcome the rapid variation of voltage of the power distribution system.Then,the Agent⁃based distributed secondary control is used to generate voltage correction items with adjacent Agent distributed communication so as to achieve average bus voltage recovery and proportional distribution of reactive power.Finally,the effectiveness of the proposed control strategy is verified through experimental simulation analysis.The experimental results show that the proposed control strategy can com⁃pensate for the uncertainty of photovoltaic power generation in real time,have a good photovoltaic system voltage control effect,and have high robustness to large load variation,active power variation and agent failures as well as improve effectively stability of the power distribution system.