基于一致性算法的配电网谐波分布式治理策略

Distributed Harmonic Mitigation Strategy of Distribution Network Based on Consensus Algorithm

可再生能源及电力电子设备高比例接入配电网导致谐波源密集化、分散化、广域化,传统点对点谐波治理方式已不能适用。文中以电压检测型有源电力滤波器(VDAPF)为治理设备,提出多VDAPF集中与分布式控制相结合的电网侧分布式治理方案。以观测节点电压畸变整体最优为目标,从全网层面建立分布式治理系统运行点的长时间尺度集中控制优化模型,控制指令提供了全局治理参考基准。同时,针对短时间尺度VDAPF本地运行参数集中优化控制存在的通信频繁及计算量大问题,提出面向治理分区的VDAPF本地参数分布式设定方法,依据设置的一致性算法对本地运行各次谐波控制参数进行分频设定。算例分析结果表明,所提分布式治理方案可协调控制全网谐波电压,分布式优化方法提高了本地运行参数的计算效率,具有良好的可扩展性、可靠性及鲁棒性。

The high proportion of renewable energy and power electronic equipment connected to the distribution network has led to densification,decentralization and wide distribution of harmonic sources.It is obviously that the traditional point-to-point harmonic mitigation method is not applicable.By taking the voltage detection based active power filter(VDAPF)as the mitigation equipment,this paper proposes a distributed mitigation scheme combining centralized and distributed control of multiple VDAPFs on the grid side.To obtain the overall optimal voltage distortion at observation nodes,a long time-scale optimal model for centralized control of operation points of distributed mitigation system at the whole network level is established,and the control instruction provides the global mitigation reference.At the same time,for the problems of frequent communication and large amount of calculation on a short time scale in the centralized optimal control for local operation parameters of VDAPF,this paper proposes a distributed setting method for local parameters of VDAPF oriented to mitigation partition.The local operation control parameter of each order of harmonic is set separately based on the consistency algorithm.The case study results show that the proposed distributed mitigation scheme can coordinately control harmonic voltages of the whole network,and the distributed optimization method improves the calculation efficiency of local operation parameters and has good scalability,reliability and robustness.