本研究旨在提出一種智慧型整合電力品質調節器，用以穩定負載電壓，並改善電網電流的落後功率因數與總諧波失真。隨著分散式電源在電力系統中的普及，以及電感性負載的廣泛使用，諸如電網電壓驟降、功率因數落後與電流總諧波失真等電力品質問題日益惡化，並可能對敏感性設備造成損害。因此，本研究開發整合型電力品質調節器，旨在補償電壓驟降、虛功及電流諧波，以達到電力品質的改善。然而，當面臨負載突變或電網電壓失真時，整合型電力品質調節器補償或吸收所需的瞬時功率皆須由其直流鏈電容供應，這可能導致系統的穩定性能下降與暫態補償能力不佳。因此，為改善在負載突變與電網電壓失真下，直流鏈電壓的暫態響應，本研究首先提出一種新型的遞迴式B-Spline小波模糊類神經網路控制器，用以取代傳統的比例積分控制器，並應用於整合型電力品質調節器的直流鏈電壓控制。文中將詳細推導所提之遞迴式B-Spline小波模糊類神經網路控制器控制器的網路結構及其線上學習演算法。此外，本研究將透過多項實驗結果，驗證採用所提之遞迴式B-Spline小波模糊類神經網路控制器控制器的整合型電力品質調節器，在維持恆定直流鏈電壓、穩定負載電壓、以及改善電網功率因數與電流諧波等方面的可行性與有效性。;An intelligent unified power quality conditioner (UPQC) is proposed in this study to stabilize the load voltage and improve the lagging power factor (PF) and the total harmonic distortion (THD) of the grid current. Due to the increasing penetration of distributed generators and the extensive usage of inductive loads in power system, the power quality issues, including the grid voltage sag, lagging PF and current THD, seriously deteriorate and cause the damage of the sensitive equipment. Hence, a UPQC is developed to compensate the voltage sag, reactive power and current harmonics for the power quality improvement. Nevertheless, during sudden load changes and grid voltage distortions, the instantaneous power required for compensation or absorption is supplied by the DC-link capacitor of the UPQC, which may lead to degraded stabilization performance and poor transient compensation capability. Thus, to improve the transient responses of the DC-link voltage under the sudden load change conditions and grid voltage distortion, a novel recurrent B-spline wavelet fuzzy neural network (RBSWFNN) controller is firstly proposed to replace the traditional proportional-integral (PI) controller for the DC-link voltage control of the UPQC. The network structure and the online learning algorithm of the proposed RBSWFNN controller are derived in detail. Moreover, the feasibility and effectiveness of the UPQC using the proposed RBSWFNN controller to maintain the constant DC-link voltage, stabilize the load voltage, and improve the lagging PF and the current THD of the power grid are validated by some experimental results.
