风电场中谐波源的突发性、随机性给谐波电流治理带来较大的困难。阐述风电场HAPF工作原理，提出基于后向最佳线性预测理论的风电场HAPF谐波电流预测方法。通过求解最佳预测系数满足的正交、正则方程，进而推导出最小后向误差功率方程。定义了前向预测误差和后向预测误差的相关系数，由Levinson-Durbin算法得出最小预测误差及系数的阶更新方程。建立后向线性预测模型，根据现在时刻的谐波电流，通过显示预测控制方法得出前面时刻的谐波电流，为制定后续谐波电流控制方法提供依据。仿真和实验验证了该方法的正确性和可行性。%The burstiness and randomness of harmonic sources bring major difficulty to harmonic current suppression in wind farm. The principle of HAPF in wind farm was expounded, and a harmonic current forecasting method for hybrid active power filters based on the optimum backward linear prediction theory in wind farm was proposed. By solving the orthogonal and canonical equations which the optimal predic-tion coefficients satisfy, the smallest backward error power equation is deduced. Correlation coefficients of the forward prediction error and the backward prediction error was defined. The rank update equations of minimum prediction errors and coefficients were obtained through Levinson-Durbin algorithm. A backward linear prediction model was established. According to the present harmonic currents this method predicts the harmonic currents on the front time through display predictive control method, and can provide the basis for formulating subsequent harmonic current controlling method. The simulation results and experi-ment show that the method is correct and feasible.
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