A Novel Single-Phase PV Generation System with  LVRT Capability

doi:10.11930/j.issn.1004-9649.2016.03.160.06

Electric Power ›› 2016, Vol. 49 ›› Issue (3): 160-165.DOI: 10.11930/j.issn.1004-9649.2016.03.160.06

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A Novel Single-Phase PV Generation System with LVRT Capability

LI Chengyao¹, YANG Yong², ZHU Binbin²

1．School of Mechanical and Electric Engineering, Soochow University, Suzhou 215006, China;
2 School of Urban Rail Transportation, Soochow University, Suzhou 215006, China

Received:2015-09-16 Online:2016-03-20 Published:2016-04-08
Supported by:
This work is supported by National Natural Science Youth Foundation of China (No. 51407124).

Abstract

Abstract: Grid-connected photovoltaic(PV) systems with the capability of low-voltage-ride-through(LVRT) have become a future development trend. A novel control strategy for single-phase two-stage grid-connected PV systems is introduced in this paper. DC-link voltage is flexibly controlled by a two-stage system to minimize voltage variation during grid-fault period. At low-voltage- ride-through stage, a constant peak current strategy is used to avoid triggering over-current protection while the sag depth of grid voltage determines the amount of reactive power delivered for grid recovery. A compensator is added in the proposed strategy to minimize the 2nd-order ripple in the reference active current. Simulation results on the whole system shows that the proposed strategy is effective with satisfying steady-state and dynamic performance.

Key words: PV system, LVRT, dc-link voltage control, constant peak current strategy, 2nd-order ripple compensation

CLC Number:

TM615

LI Chengyao, YANG Yong, ZHU Binbin. A Novel Single-Phase PV Generation System with LVRT Capability[J]. Electric Power, 2016, 49(3): 160-165.

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A Novel Single-Phase PV Generation System with LVRT Capability

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