| 摘要: |
| 建立了大型光伏电站的诺顿等效模型，推导了逆变器输出电流和并网点电压表达式，研究了光伏电站中由无功补偿装置、升压变压器漏感、输电线路阻抗等组成的电网阻抗对三相光伏逆变器并联系统谐振现象以及电能质量的影响。最后建立系统仿真模型进行验证，结果表明：电网阻抗导致系统存在谐振现象，降低系统电能质量；与输电距离增加相比，光伏电站容量增加更容易导致系统电能质量降低；并网点电压的谐波畸变率远大于逆变器输出电流，并网点电压谐波含量更易超标。 |
| 关键词: 光伏 电站 逆变器 电网阻抗 诺顿等效模型 谐振 模型 电能质量 |
| DOI： |
| 分类号: |
| 基金项目:国家高技术研究发展计划（863计划）资助项目（2011AA05A301） |
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| Analysis of resonance phenomenon in large-scale photovoltaic power plant |
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ZHOU Lin, ZHANG Mi
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State Key Laboratory of Power Transmission Equipment & System Security and New Technology，
Chongqing University，Chongqing 400030，China
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| Abstract: |
| The Norton equivalent model of large-scale photovoltaic power plant is established，the expression formulas are deduced for the inverter output current and the voltage at grid-connection point，and the influences of grid impedance composed of the reactive power compensation device，Boost transformer leakage inductance and transmission line impedance on the power quality and the resonance phenomenon in the parallel system of three-phase photovoltaic inverter are analyzed. A simulation model of power system is built for validating the theoretical analysis and results show that，there is resonance phenomenon in the system，which is induced by the grid impedance and causes the decrease of its power quality. Compared with the increase of transmission distance，the increase of photovoltaic capacity does more likely reduce the power quality of system，while compared with the inverter output current，the voltage at grid-connection point has much higher THD and its harmonic component does more likely exceed the standard. |
| Key words: photovoltaic electric power plants electric inverters grid impedance Norton equivalent model resonance models power quality |
