A Low Voltage Traversal Control Strategy for Grid-Connected PV Based on Fast Tracking of Power Reference Values

Zeyu LI; Xiaoling SU

doi:10.16513/j.2096-2185.DE.2308507

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Distributed Energy ›› 2023, Vol. 8 ›› Issue (5) : 54-60. DOI: 10.16513/j.2096-2185.DE.2308507

Basic Research

A Low Voltage Traversal Control Strategy for Grid-Connected PV Based on Fast Tracking of Power Reference Values

Zeyu LI ¹ ,
Xiaoling SU ²

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Abstract

In order to solve the problem of DC bus voltage instability caused by slow dynamic response of traditional grid-connected PV low voltage crossing control strategy, a fast tracking power reference value low voltage crossing strategy based on graph method and model predictive control is proposed. The strategy firstly calculates the reference power of the AC and DC side according to the voltage drop degree of the grid side, and then controls the photovoltaic array and the inverter to output the corresponding reference power to achieve the fast balance of the AC and DC side. The simulation results show that when the power reference value changes, the response time of the traditional control strategy is 200 ms on the DC side, 16.5 ms on the AC side, and 17 ms on the reactive side, while the response time of the strategy proposed in this paper is 5.000, 0.140, 0.135 ms, which verifies the speediness of the proposed control strategy.

Key words

two-stage grid-connected PV / fast tracking power reference value / dynamic response / control strategy / low voltage crossing

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Zeyu LI , Xiaoling SU. A Low Voltage Traversal Control Strategy for Grid-Connected PV Based on Fast Tracking of Power Reference Values[J]. Distributed Energy Resources. 2023, 8(5): 54-60 https://doi.org/10.16513/j.2096-2185.DE.2308507

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