【摘要】 光伏电站内光伏阵列的现场I-V测量可以评估当前系统发电性能和阵列状态，但现场的传输线路阻抗会使I-V测量产生误差，影响了评估的准确性，不利于光伏电站运维决策。该文分析测量线路阻抗和环境参数对常规动态电容I-V测量方法的影响机理，并进行仿真验证。根据误差影响机理和测量回路等效模型，提出一种双电容组合I-V特性测量方法，并研制样机进行实验验证。实验结果表明，该测量方法可有效消除线路分布参数对光伏阵列I-V测量的影响，提高测量精度。更多还原

【Abstract】 The on-site I-V measurement of photovoltaic array in a photovoltaic power station can evaluate the current system power generation performance and array status,but the on-site transmission line impedance will cause error in I-V measurement,which not only affects the accuracy of the estimate but also is not beneficial to the policy-making of the photovoltaic power station operation. The article analyzes the influence mechanism of measurement line impedance and environmental parameters on the conventional dynamic capacitance I-V measurement method,and conducts simulation verification. According to the influence mechanism of the error and the equivalent model of the measurement loop,the article proposes a method for measuring the I-V characteristics of a dual-capacitor combination,and develops a prototype for experimental verification. The experimental results indicate that the measurement method can efficaciously eliminate the influence on I-V measurement of photovoltaic array by line distribution parameters and improve the measurement accuracy.更多还原