| 考虑传输线分布电容影响的光伏并网系统谐波谐振抑制策略 |
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| 引用本文： | 沈虹,康佳,张劲松,孙孝峰.考虑传输线分布电容影响的光伏并网系统谐波谐振抑制策略[J].太阳能学报,2020,41(1):101-109. |
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| 作者姓名： | 沈虹 康佳 张劲松 孙孝峰 |
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| 作者单位： | 燕山大学电力电子节能与传动控制河北省重点实验室 |
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| 基金项目： | 国家重点研发计划(2016YFB0900300);国家自然科学基金(51677162,51407155);河北省自然科学基金(E2015203407,E2016203156,E2017203337)。 |
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| 摘 要： | 以传输线联网的光伏逆变器为研究对象,当传输线中分布电容较大不能忽略时,考虑传输线分布电容的影响下,分析系统的谐振特性以及电网背景谐波在传输线中的传播特性。针对系统的谐波谐振情况,提出基于电容电压的有源阻尼策略有效抑制系统出现的多个谐振尖峰,同时抑制电网中5次背景谐波的传播放大。为更好地抑制7次背景谐波,在上述控制算法的基础上于电容电压反馈通道中引入7次谐振控制器重塑逆变器输出的7次谐波阻抗。最后,在所提方案下,对逆变器输出5次谐波阻抗进行约束来优化控制参数,有效减小背景谐波导致的入网电流畸变。仿真验证所提方案的正确性和有效性。
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| 关 键 词： | 光伏逆变器 传输线的分布电容 谐振特性 背景谐波的传播放大 有源阻尼策略 |
RESONANCES AND HARMONIC PROPAGATION SUPPRESSION STRATEGY CONSIDERING DISTRIBUTED CAPACITANCE OF FEEDER |
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| Shen Hong,Kang Jia,Zhang Jinsong,Sun Xiaofeng.RESONANCES AND HARMONIC PROPAGATION SUPPRESSION STRATEGY CONSIDERING DISTRIBUTED CAPACITANCE OF FEEDER[J].Acta Energiae Solaris Sinica,2020,41(1):101-109. |
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| Authors: | Shen Hong Kang Jia Zhang Jinsong Sun Xiaofeng |
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| Affiliation: | (Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province,Yanshan University Qinhuangdao 066004,China) |
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| Abstract: | The PV inverter connected to the transmission line is used as the research object. When the distributed capacitance of the transmission line is too large to be neglected,the resonance characteristic of the grid-connected system and the grid background harmonics propagation characteristics along the feeder are analyzed. For the purpose of mitigating multiple resonances,an active damping strategy based on the capacitor voltage is proposed to effectively suppress the resonance peaks,and to suppress the 5 th harmonic propagation. In order to better suppress 7 th harmonic propagation,an 7 th resonant regulator is introduced to the capacitor voltage feedback channel to reshape the output seventh harmonic impedance of the inverter. Finally,the fifth harmonic impedance of the inverter with the proposed strategy is constrained to optimize the control parameters,which effectively reduces the grid-side current distortion caused by the background harmonics. The simulations verify the effectiveness and validity of the proposed manner. |
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| Keywords: | PV inverter distributed capacitance of transmission line resonance characteristic background harmonics propagation active damping strategy |
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