Configuration Of Voltage Detection APF Based Distributed Harmonic Mitigation Considering The Auxiliary Contribution Of Multifunctional Inverters

With the large-scale penetration of power electronic source equipment,the harmonic pollution of modern distribution network shows a high density and the whole network is dispersed.The traditional point-to-point governance model is no longer applicable,and the distributed governance scheme emerges as the times require.Multi-function inverter(MFINV)has many functions,such as grid-connected and harmonious wave control.This paper proposes a voltage detection active power filter(VDAPF)distributed harmonic management optimization configuration strategy considering MFINV uncertainty governance capacity from the perspective of distributed harmonic governance.The details are as follows:Firstly,the uncertainty of harmonic and MFINV residual capacity is analyzed and clarified.By using multi-scene analysis technology,the construction method of comprehensive harmonic pollution and MFINV residual capacity uncertainty scene set is proposed.Based on the time-period analysis,the typical harmonic scene is constructed by the harmonic section clustering compression method,and the residual capacity scene is constructed based on MFINV probability density fitting method,and then combined into a double uncertainty operation scene set.It can effectively solve the uncertainty problem involved in the optimal configuration of the governance equipment,and the scene compression processing can also greatly reduce the computational cost of the optimization solution.Secondly,the working principle of VDAPF and MFINV is analyzed.Based on the harmonic property of modern distribution network,the VDAPF and MFINV cooperative distributed harmonic management scheme is put forward.On the basis of network harmonic sensitivity and voltage coupling index,a two-stage partition method considering MFINV installation position is proposed.Firstly,the DG node control area is formed according to the influence of existing MFINV on the partition,and then the final network partition is optimized by community discovery algorithm.For each region,the VDAPF optimal installation node is determined according to the maximum average harmonic sensitivity criterion.Taking IEEE 33 node network as an example,the optimal partition and VDAPF location of the network are obtained,and the feasibility of the proposed method is verified.Lastly,taking into account the MFINV harmonic management resources,the VDAPF multi-objective capacity optimization configuration model is constructed.The model takes the economic optimization as the goal one,and the VDAPF and MFINV cooperative harmonic management effect under the multi-operation scenario as the goal two.Multi-objective optimization is solved by using the plane constraint of normalization method combined with improved genetic calculation.Based on the simulation analysis of IEEE 33 node network,the results show that the proposed scheme makes full use of harmonic management resources,has better economy and governance effect,and verifies the effectiveness of the proposed strategy.