Inter-harmonic parameters estimation in power grid based on accelerated PSO and T5R11 window
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abstract
The Institution of Engineering and Technology 2019 A novel method on inter-harmonic parameters estimation is proposed. It contains two steps: pre-calculation and solution optimisation. An interpolated-discrete fourier transform (DFT)-based algorithm with a fifth-order-triangular and eleventh-order-rectangular (T5R11) window is applied in the pre-calculation process. Owing to mainlobe interferences caused by inter-harmonics in the frequency domain, the accelerated particle swarm optimisation (PSO) algorithm is proposed to optimise the solution of pre-calculation. Three aspects in the PSO are accelerated including utilising the especial DFT expression of T5R11 window, applying a changing inertia weight and locking the frequency. From the view of estimating accuracy, the errors caused by spectral leakage can be restrained to a degree of 1011 by using T5R11 window, and the relative errors of parameters could be optimised to a degree of 105 at the tenth generation in the accelerated PSO. More simulations show that the proposed method can address many complex situations caused by inter-harmonics, and corresponding detection accuracies satisfy the requirements of national and international standards.
