Small-Signal Modeling and Parameter Optimization Design for Photovoltaic Virtual Synchronous Generator

Jun Deng, Nan Xia, Jungang Yin, Jiliang Jin, Shutao Peng and Tong Wang
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Jun Deng: State Grid Shaanxi Electric Power Research Institute, Xi’an 710100, China
Nan Xia: State Grid Shaanxi Electric Power Research Institute, Xi’an 710100, China
Jungang Yin: State Grid Shaanxi Electric Power Research Institute, Xi’an 710100, China
Jiliang Jin: State Grid Shaanxi Electric Power Research Institute, Xi’an 710100, China
Shutao Peng: State Grid Shaanxi Electric Power Research Institute, Xi’an 710100, China
Tong Wang: School of Electrical & Electronic Engineering, North China Electric Power University, Changping District, Beijing 102206, China

Energies, 2020, vol. 13, issue 2, 1-14

Abstract: With the continuous proliferation of renewable energy generation, distributed photovoltaic inverters operating at a maximum power point reduce the inertia of power systems, degrading system frequency stability and potentially causing severe oscillations in systems after being disturbed. The virtual synchronous generator (VSG) control method, which causes photovoltaic inverters to possess inertia and damping, now plays an important role in the field of distributed generation. However, while introducing the advantages of synchronous machines, problems with oscillations are also introduced and the stochastic fluctuation characteristic of photovoltaics results in the stochastic drifting of the operating point. This paper presents an adaptive controller parameter design method for a photovoltaic-VSG (PV-VSG) integrated power system. Firstly, a small-signal model of the PV-VSG is built and a state space model is deduced. Then, the small-signal stability and low frequency oscillation characteristics of the photovoltaic power generation system are analyzed. Finally, considering the limitations of system oscillations and the stochastic drifting of the operating point, a global optimization design method for controller parameters used to improve system stability is proposed. The time domain simulation shows that an optimized PV-VSG could provide sufficient damping in the case of photovoltaic power output changes across a wider range.

Keywords: virtual synchronous generator; photovoltaic inverter; small-signal modeling; eigenvalue analysis; optimal design of parameters (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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