Mechanism and Hierarchical Coordinated Control of Solar Photovoltaic Inverter Cluster Resonance in Civil Buildings

doi:10.3969/j.issn.1008-0198.2023.04.005

Hunan Electric Power ›› 2023, Vol. 43 ›› Issue (4): 32-39.doi: 10.3969/j.issn.1008-0198.2023.04.005

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Mechanism and Hierarchical Coordinated Control of Solar Photovoltaic Inverter Cluster Resonance in Civil Buildings

DING Jinsong^1,2, YAO Hongde¹, LI Shengqing¹, MENG Huanping³, ZHU Hui⁴

1. School of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China;
2. Hunan Kori Convertors Electric Co., Ltd, Zhuzhou 412007, China;
3. Hunan Architectural Design Institute Group Co., Ltd, Changsha 410012, China;
4. Hunan Red Sun Photoelectricity Science and Technology Co., Ltd, Changsha 410007, China

Received:2023-03-17 Revised:2023-05-18 Online:2023-08-25 Published:2023-09-07

Abstract

Abstract: The clustering of photovoltaic(PV) inverter in residential buildings is prone to harmonic resonance, which seriously affects system stability and power quality. To address this problem, a mathematical model of PV inverter clusters connected to the grid is established, the resonance mechanism and resonance characteristics of single inverters and inverter clusters are derived, and a hierarchical coordination control strategy for PV inverter cluster resonance is proposed. In the first layer, for the inherent resonance of LCL-type PV inverters, an active damping method based on capacitor-voltage inertia feedback with forward-channel series trap is proposed.In the second layer, for the resonance generated by the coupling of PV inverter clusters with grid impedance,a method for suppressing the resonance of parallel virtual admittance of common coupling points is proposed.The grid-connected current quality is improved through the hierarchical division and coordinated control of the grid-connected resonance of inverter clusters.The simulation results show that compared with the traditional capacitor current feedback strategy, the harmonic distortion rate of grid-connected current decreases obviously, and the grid-connected resonant of the inverter is effectively suppressed, which proves the feasibility of the proposed strategy.

Key words: inverter cluster, resonance mechanism, coordination control

CLC Number:

TM464

DING Jinsong, YAO Hongde, LI Shengqing, MENG Huanping, ZHU Hui. Mechanism and Hierarchical Coordinated Control of Solar Photovoltaic Inverter Cluster Resonance in Civil Buildings[J]. Hunan Electric Power, 2023, 43(4): 32-39.

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Mechanism and Hierarchical Coordinated Control of Solar Photovoltaic Inverter Cluster Resonance in Civil Buildings

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