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基于电网电压增量前馈补偿的光伏并网系统故障后恢复控制
作者:
作者单位:

1.新能源电力系统国家重点实验室(华北电力大学);2.国网江西省电力有限公司检修分公司,江西省南昌市 330029

作者简介:

通讯作者:

基金项目:

国家重点研发计划基金资助项目(2018YFB0904104)。


Post Fault Recovery Control of Grid-connected Photovoltaic System Based on Feedforward Compensation of Grid Voltage Incremental
Author:
Affiliation:

1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Beijing 102206, China;2.Maintenance Branch of State Grid Jiangxi Electric Power Company, Nanchang 330029, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2018YFB0904104).

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    摘要:

    光伏直流升压汇集系统经较大过渡电阻的故障清除后,存在直流变压器难以切换回原有控制策略的问题。针对此,在分析故障点过渡电阻和直流电压波动量之间关系的基础上,提出了一种基于电网电压增量前馈补偿的故障后恢复控制策略。在故障清除时,通过监测电网电压增量值,采用修正逆变器控制外环直流电压参考值的方式短时增大直流母线电压的波动量,从而使直流变压器实现控制策略的可靠切换。仿真结果表明,所提方法在交流电网经较大过渡电阻发生的故障被清除后,光伏侧控制策略能可靠且快速地进行切换,极大地提高了光伏的利用率。

    Abstract:

    When the fault with a large transition resistance in grid-connected photovoltaic system by DC boosting curcuit is cleared, the direct current transformer(DCT) is difficult to automatically switch back to its original control strategy. Based on the analysis of the relationship between transition resistance and the DC voltage fluctuation, a coordinated control strategy based on the feedforward compensation for voltage incremental of power grid is proposed. By detecting the incremental value of power grid voltage, the fluctuation value of DC voltage increases by correcting the reference DC voltage of inverter outer control loop,which enables the reliabe switch of DCT control strategy. The simulation results show that control strategy on photovolatic side can swith reliably and quickly after the fault with large transition resistance in AC grid is cleared, and it effectively improves the utilization of photovoltaic resources.

    表 2 Table 2
    图1 光伏经直流升压汇集并网拓扑Fig.1 Topology of the photovoltaic integrated with power grid by DC boosting curcuit
    图2 FRT期间系统控制策略Fig.2 Control strategy of system during FRT
    图3 修正后的MMC控制外环Fig.3 Modified control outer loop of MMC
    图4 电网不对称故障时系统响应Fig.4 System response with asymmetric grid faults
    图5 控制策略修正前后的系统响应对比Fig.5 Comparison of system response before and after control strategy modification
    图 电流解耦网络结构图Fig. The structure diagram of current decoupling network
    图 功率参考值计算结构图Fig. The structure diagram of power reference calculation
    图 相间经阻抗短路 (a)等值示意图,(b)复合序网Fig. Interphase impedance short-circuit. (a) Equivalent diagram, (b) Composite sequence network
    表 3 Table 3
    表 1 Table 1
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引用本文

贾科,陈金锋,王和春,等.基于电网电压增量前馈补偿的光伏并网系统故障后恢复控制[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20190710006.
JIA Ke,CHEN Jinfeng,WANG Hechun,et al.Post Fault Recovery Control of Grid-connected Photovoltaic System Based on Feedforward Compensation of Grid Voltage Incremental[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20190710006.

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  • 收稿日期:2019-07-10
  • 最后修改日期:2020-02-21
  • 录用日期:2019-11-18
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