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Energies 2018, 11(8), 1996; https://doi.org/10.3390/en11081996

A Distribution Static Compensator Using a CFNN-AMF Controller for Power Quality Improvement and DC-Link Voltage Regulation

1
Department of Electrical and Electronic Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyuan 335, Taiwan
2
Department of Electrical Engineering, National Central University, Taoyuan 320, Taiwan
3
Nuclear Instrumentation Division, Institute of Nuclear Energy Research, Taoyuan 335, Taiwan
*
Author to whom correspondence should be addressed.
Received: 16 July 2018 / Revised: 27 July 2018 / Accepted: 30 July 2018 / Published: 1 August 2018
(This article belongs to the Special Issue Electric Power Systems Research 2018)
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Abstract

A distribution static compensator (DSTATCOM) is proposed in this study to improve the power quality, which includes the total harmonic distortion (THD) of the grid current and power factor (PF), of a mini grid with nonlinear and linear inductive loads. Moreover, the DC-link voltage regulation control of the DSTATCOM is essential especially under load variation conditions. Therefore, to improve the power quality and keep the DC-link voltage of the DSTATCOM constant under the variation of nonlinear and linear loads effectively, the traditional proportional-integral (PI) controller is substituted with a new online trained compensatory fuzzy neural network with an asymmetric membership function (CFNN-AMF) controller. In the proposed CFNN-AMF, the compensatory parameter to integrate pessimistic and optimistic operations of fuzzy systems is embedded in the CFNN. Furthermore, the dimensions of the Gaussian membership functions are directly extended to AMFs for the optimization of the fuzzy rules and the upgrade of learning ability of the networks. In addition, the network structure and online learning algorithm of the proposed CFNN-AMF are introduced in detail. Finally, the effectiveness and feasibility of the DSTATCOM using the proposed CFNN-AMF controller to improve the power quality and maintain the constant DC-link voltage under the change of nonlinear and linear inductive loads have been demonstrated by some experimental results. View Full-Text
Keywords: distribution static compensator; power quality; total harmonic distortion; compensatory neural fuzzy network; asymmetric membership function distribution static compensator; power quality; total harmonic distortion; compensatory neural fuzzy network; asymmetric membership function
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Tan, K.-H.; Lin, F.-J.; Tsai, C.-Y.; Chang, Y.-R. A Distribution Static Compensator Using a CFNN-AMF Controller for Power Quality Improvement and DC-Link Voltage Regulation. Energies 2018, 11, 1996.

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