基于有功-无功控制的光伏并网点电压调节方案
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摘要
越来越多的分布式光伏发电系统接入配电网,改变了传统配电网潮流只有单方流动的模式,有可能出现潮流逆流从而导致光伏并网点电压升高甚至越限,以至于影响了本地的电能质量以及光伏的渗透率。针对电压升高的问题,本文首先从电力系统功率传输理论的角度分析了光伏并网引起电压越限的机理,改进了传统的无功调压策略,避免了线路中出现不必要的无功流动;然后提出了较为方便且具有自适应性的有功限值确定方法,研究了利用光伏自身有功-无功功率综合控制的并网点电压调节策略;最后在PSCAD/EMTDC中搭建了分布式光伏并网发电系统的电磁暂态仿真模型,且在仿真中验证了所提调压策略的有效性与经济性。
More and more distributed photovoltaic power generation systems are connected to the distribution network, which changes the traditional single flow of power flow in the distribution network. It is possible that the grid-connected voltage will be lead to voltage rise or even exceed limit, affecting the local power quality and photovoltaic penetration. This paper analyzes the mechanism of overvoltage caused by photovoltaic grid connection from the perspective of power transmission theory. The traditional reactive power regulation strategy is improved to avoid unnecessary reactive power flow in the circuit. A more convenient and adaptive method for determining active power limits is presented. The voltage control strategy of photovoltaic power generation based on active power and reactive power control is studied. The electromagnetic transient simulation model of distributed photovoltaic grid-connected system is built in PSCAD/EMTDC. The simulation results verify the effectiveness and economy of the proposed voltage regulation strategy.
More and more distributed photovoltaic power generation systems are connected to the distribution network, which changes the traditional single flow of power flow in the distribution network. It is possible that the grid-connected voltage will be lead to voltage rise or even exceed limit, affecting the local power quality and photovoltaic penetration. This paper analyzes the mechanism of overvoltage caused by photovoltaic grid connection from the perspective of power transmission theory. The traditional reactive power regulation strategy is improved to avoid unnecessary reactive power flow in the circuit. A more convenient and adaptive method for determining active power limits is presented. The voltage control strategy of photovoltaic power generation based on active power and reactive power control is studied. The electromagnetic transient simulation model of distributed photovoltaic grid-connected system is built in PSCAD/EMTDC. The simulation results verify the effectiveness and economy of the proposed voltage regulation strategy.
引文
[1]丁明,王伟胜,王秀丽,等.大规模光伏发电对电力系统影响综述[J].中国电机工程学报,2014,34(1):1-14.
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[8]李清然,张建成.含分布式光伏电源的配电网电压越限解决方案[J].电力系统自动化,2015,39(22):117-123.
[9]方景辉,温镇.分布式光伏就地自适应电压控制策略研究[J].电力系统保护与控制,2015,43(23):49-55.
[10]蔡永翔,张璐,唐巍,等.考虑逆变器无功充裕性的含高比例户用光伏低压配电网电压控制策略[J].电网技术,2017,41(9):2799-2808.
[11]Weckx S,Driesen J.Optimal local reactive power control by PV inverters[J].IEEE Transactions on Sustainable Energy,2016,7(4):1624-1633.
[12]Alam M,Muttaqi K M,Sutanto D.A Multi-Mode control strategy for VAr support by solar PVinverters in distribution networks[J].IEEETransactions on Power Systems,2015,30(3):1316-1326.
[13]周林,任伟,廖波,等.并网型光伏电站无功电压控制[J].电工技术学报,2015,30(20):168-175.
[14]陈权,李令冬,王群京,等.光伏发电并网系统的仿真建模及对配电网电压稳定性影响[J].电工技术学报,2013,28(3):241-247.
[15]王秀丽,王相峰,赵兴勇.光伏电站(PPS)建模及其对电网稳定性影响研究[J].电气技术,2015,16(4):39-42.
[16]陈沛华,赵会茹,李娜娜.分布式光伏电源并网影响与应对措施[J].电气技术,2015,16(1):125-127.
[2]蔡永翔,唐巍,徐鸥洋,等.含高比例户用光伏的低压配电网电压控制研究综述[J].电网技术,2018,42(1):220-229.
[3]李升,卫志农,孙国强,等.大规模光伏发电并网系统电压稳定分岔研究[J].电力自动化设备,2016,36(1):17-23.
[4]周林,晁阳,廖波,等.低压网络中并网光伏逆变器调压策略[J].电网技术,2013,37(9):2427-2432.
[5]Samadi A,Eriksson R,Soder L,et al.Coordinated active power-depender voltage regulation in distribution grids with PV systems[J].IEEE Trans on Power Delivery,2014,29(3):1454-1464.
[6]Wandhare R G,Agarwal V.Reactive power capacity enhancenant of a PV-grid system to increase PVpenetrarion level in smart grid scenario[J].IEEETrans on Smart Grid,2014,5(4):1815-1854.
[7]黄欣科,王环,王一波,等.光伏发电系统并网点电压升高调整原理及策略[J].电力系统自动化,2014,38(3):112-117.
[8]李清然,张建成.含分布式光伏电源的配电网电压越限解决方案[J].电力系统自动化,2015,39(22):117-123.
[9]方景辉,温镇.分布式光伏就地自适应电压控制策略研究[J].电力系统保护与控制,2015,43(23):49-55.
[10]蔡永翔,张璐,唐巍,等.考虑逆变器无功充裕性的含高比例户用光伏低压配电网电压控制策略[J].电网技术,2017,41(9):2799-2808.
[11]Weckx S,Driesen J.Optimal local reactive power control by PV inverters[J].IEEE Transactions on Sustainable Energy,2016,7(4):1624-1633.
[12]Alam M,Muttaqi K M,Sutanto D.A Multi-Mode control strategy for VAr support by solar PVinverters in distribution networks[J].IEEETransactions on Power Systems,2015,30(3):1316-1326.
[13]周林,任伟,廖波,等.并网型光伏电站无功电压控制[J].电工技术学报,2015,30(20):168-175.
[14]陈权,李令冬,王群京,等.光伏发电并网系统的仿真建模及对配电网电压稳定性影响[J].电工技术学报,2013,28(3):241-247.
[15]王秀丽,王相峰,赵兴勇.光伏电站(PPS)建模及其对电网稳定性影响研究[J].电气技术,2015,16(4):39-42.
[16]陈沛华,赵会茹,李娜娜.分布式光伏电源并网影响与应对措施[J].电气技术,2015,16(1):125-127.