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发明公开
CN105068590A 光伏发电功率控制方法和系统 有权 转让

光伏发电功率控制方法和系统
摘要：
本发明涉及一种光伏发电功率控制方法和系统，其中，方法包括：获取光伏电池功率-电压拟合曲线；对光伏电池输出电流和输出电压进行采样，得到样本点的电流ipv和电压vpv，计算功率Ppv；对光伏电池功率-电压拟合曲线进行采样，得到样本点(v1,P1)和(v2,P2)；若(vpv,Ppv)满足误差条件，则以(vpv,Ppv)代替(v1,P1)，重新拟合光伏电池功率-电压曲线，并按照电压值大小从小到大重新排列采样点(v1,P1)和(v2,P2)；否则，对光伏电池输出电流ipv和输出电压vpv进行重新采样；根据重新排列后的样本点(v1,P1)和(v2,P2)获取实时光伏电池功率-电压曲线；接收功率指令，在光伏电池功率-电压曲线上查询所述功率指令指示的功率值对应的电压，设为电压参考值；根据所述电压参考值和升压电路电感电流对升压电路进行电压电流双闭环控制。
摘要（英）：

The invention relates to a photovoltaic power generation control method and system. The photovoltaic power generation control method comprises the step of obtaining a power-voltage fitted curve of a photovoltaic cell, sampling output current and output voltage of the photovoltaic cell to obtain current ipv and voltage vpv of a sample point, calculating power Ppv, sampling the power-voltage fitted curve of the photovoltaic cell to obtain a sample point (v1, P1) and a sample point (v2, P2), using (vpv, Ppv) to replace (v1, P1) and re-fitting the power-voltage fitted curve of the photovoltaic cell if the (vpv, Ppv) meets the error condition, re-arranging the sample point (v1, P1) and the sample point (v2, P2) according to voltage values from small to large, re-sampling the output current ipv and the output voltage vpv of the photovoltaic cell if the (vpv, Ppv) does not meet the error condition, obtaining a real-time power-voltage fitted curve of the photovoltaic cell according to the sample point (v1, P1) and the sample point (v2, P2) which are re-arranged, receiving a power instruction, querying voltage corresponding to a power value indicated by the power instruction from the power-voltage fitted curve of the photovoltaic cell, setting the voltage as a voltage reference value, and conducting voltage and current double-closed-loop control on a booster circuit according to the voltage reference value and inductive current of the booster circuit.

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