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A Novel Three-Phase Four-Wire Grid-Connected Synchronverter that Mimics Synchronous Generators

  • Tan, Qian (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University) ;
  • Lv, Zhipeng (China Electric Power Research Institute) ;
  • Xu, Bei (Department of Electronics Engineering, Beijing Jiaotong University) ;
  • Jiang, Wenqian (Guangxi Electric Power Research Institute, Nanning, Guangxi Zhuang Autonomous Region) ;
  • Ai, Xin (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University) ;
  • Zhong, Qingchang (China Electric Power Research Institute)
  • Received : 2016.01.13
  • Accepted : 2016.07.14
  • Published : 2016.11.20

Abstract

Voltage and frequency stability issues occur in existing centralized power system due to the high penetration of renewable energy sources, which decrease grid absorptive capacity of them. The grid-connected inverter that mimics synchronous generator characteristics with inertia characteristic is beneficial to electric power system stability. This paper proposed a novel three-phase four-wire grid-connected inverter with an independent neutral line module that mimics synchronous generators. A mathematical model of the synchronous generator and operation principles of the synchronverter are introduced. The main circuit and control parameters design procedures are also provided in detail. A 10 kW prototype is built and tested for further verification. The primary frequency modulation and primary voltage regulation characteristics of the synchronous generator are emulated and automatically adjusted by the proposed circuit, which helps to supports the grid.

Acknowledgement

Supported by : National Natural Science Foundation of China

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