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Strategies to Increase the Transient Active Power of Photovoltaic Units during Low Voltage Ride Through

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  • Xiangwu Yan

    (Key Laboratory of Distributed Energy Storage, Micro-Grid of Hebei Province, North China Electric Power University, No.619 Yonghua Road, Baoding 071003, China)

  • Baixue Liang

    (Key Laboratory of Distributed Energy Storage, Micro-Grid of Hebei Province, North China Electric Power University, No.619 Yonghua Road, Baoding 071003, China)

  • Jiaoxin Jia

    (Key Laboratory of Distributed Energy Storage, Micro-Grid of Hebei Province, North China Electric Power University, No.619 Yonghua Road, Baoding 071003, China)

  • Waseem Aslam

    (Department of Electrical Engineering, University of Sargodha, Sargodha 40100, Pakistan)

  • Chenguang Wang

    (Key Laboratory of Distributed Energy Storage, Micro-Grid of Hebei Province, North China Electric Power University, No.619 Yonghua Road, Baoding 071003, China)

  • Shizheng Zhang

    (Key Laboratory of Distributed Energy Storage, Micro-Grid of Hebei Province, North China Electric Power University, No.619 Yonghua Road, Baoding 071003, China)

  • Hongbin Ma

    (Key Laboratory of Distributed Energy Storage, Micro-Grid of Hebei Province, North China Electric Power University, No.619 Yonghua Road, Baoding 071003, China)

Abstract

Due to a limitation in the magnitude of the three-phase output inverter currents, the output active power of the photovoltaic (PV) unit has been de-rated during low voltage ride through, which brings great instability risk to the power system. With the increase in the penetration rate of new energy, the impact of the power shortage on the system transient stability increases. It is of great significance to analyze the impact of this transient power shortage on system stability. This article explores methods to improve the active power output capability of photovoltaic units during low-breakthrough periods. A transient simulation model of a grid-connected PV generator with low-voltage ride-through (LVRT) capability is presented, under the condition of meeting the overcurrent capacity of the PV inverter and the requirement of dynamic reactive power support supplied by the PV generator specified in the China grid codes (GB/T 19964-2012) during grid fault. An example system with high PV penetration is built. The change principle and influencing factors of PV transient active power output are analyzed. The simulation model is designed in PowerFactory/DIgSILENT, and several types of three-phase voltage sags are performed in simulation to assess the impact of the active current reference calculation method and the maximum inverter output current ( I max ) limit value on the PV active power output. According to the three indexes, namely the maximum active power of PV unit during the fault, the power improvement gradient and the power surge after the fault is cleared. Simulation results showed that using the orthogonal decomposition method to calculate the active current reference can make full use of the current capacity of the converter. Setting I max to 1.1 rated current of photovoltaic inverter ( I N ) can reduce the cost-effectiveness ratio of the transient active power output of the PV unit. Therefore, we aim to improve the unit’s transient active power output capacity and realize the optimal effect of improving the transient active power shortage of the system.

Suggested Citation

  • Xiangwu Yan & Baixue Liang & Jiaoxin Jia & Waseem Aslam & Chenguang Wang & Shizheng Zhang & Hongbin Ma, 2021. "Strategies to Increase the Transient Active Power of Photovoltaic Units during Low Voltage Ride Through," Energies, MDPI, vol. 14(17), pages 1-14, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5236-:d:620800
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    References listed on IDEAS

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    1. Oon, Kheng Heong & Tan, ChiaKwang & Bakar, A.H.A. & Che, Hang Seng & Mokhlis, H. & Illias, H.A., 2018. "Establishment of fault current characteristics for solar photovoltaic generator considering low voltage ride through and reactive current injection requirement," Renewable and Sustainable Energy Reviews, Elsevier, vol. 92(C), pages 478-488.
    2. Alexis B. Rey-Boué & N. F. Guerrero-Rodríguez & Johannes Stöckl & Thomas I. Strasser, 2019. "Modeling and Design of the Vector Control for a Three-Phase Single-Stage Grid-Connected PV System with LVRT Capability according to the Spanish Grid Code," Energies, MDPI, vol. 12(15), pages 1-28, July.
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