多模式電流控制之三相市電併聯儲能系統之研製

Three-Phase Grid-Connected Energy Storage System with Multi-Mode Current Control

陳芃孜(Pon-Tzu Chen)

指導教授 ： 陳耀銘

共同指導教授 ： 唐丞譽(Cheng-Yu Tang)

國立臺灣大學/電機資訊學院/電機工程學研究所/碩士(2020年)

https://doi.org/10.6342/NTU202001975

摘要

本論文研製一具多模式電流控制之三相市電併聯儲能系統。此系統將包含太陽能充電器、儲能系統與三相市電併聯換流器。首先，為優化電池之充電性能，本文將導入複合式充電方法，包含: (1)定電流充電、(2)脈衝式充電、(3)弦波式充電、(4)雙向脈衝式充電與(5)雙向弦波式充電。
　　為維持太陽能最大功率輸出並達成最大電能利用率，本文開發一多模式電流控制策略。此策略將藉由市電併聯型換流器之雙向潮流功率控制，配合太陽能輸出功率與電池之充電電流，並於實現複合式充電法之同時，維持太陽能充電器之最大功率追蹤功能。所提出之策略亦可達成電池雙向充/放電功能，提升電池充電效率。此外，所開發之控制策略可藉由數位控制處理器實現，而不需增加額外電路、元件與通訊機制。系統之操作原理與完整數學推導亦將呈現於本論文中。最後，本論文研製一5kW電路原型機，並藉由硬體實作電路驗證所提出之硬體電路與控制策略之可行性。

關鍵字

電流控制 ； 儲能系統 ； 三相換流器

並列摘要

The objective of this thesis is to propose the multi-mode current control strategy for the three-phase grid-connected energy storage system. First, in order to optimize the battery charging performance, five charging strategies: (1) the constant-current (CC), (2) the pulse-ripple-current (PRC), (3) the sinusoidal-ripple-current (SRC), (4) the bidirectional pulse-ripple-current (BPRC) and (5) the bidirectional sinusoidal-ripple-current (BSRC) are adopted. In order to maintain the maximum PV power output as well as to achieve the maximum PV power utilization, the multi-mode current control strategy is proposed. With the proposed strategy, bidirectional power flow control will be developed for the three-phase grid-tied inverter. Therefore, the PV power and the battery current can be regulated via the inverter. On the other hand, the proposed multi-mode current control is able to realize different charging methods as well as to maintain the MPPT function of the PV array. In addition, with the proposed strategies, the bidirectional charging/discharging capability of the battery is able to increase the charginge efficiency. The proposed multi-mode current control strategy can be realized by the already existed DSP in the controller without adding any additional circuit, component and communication mechanism. Operational principles and thorough mathematical derivations are developed. Finally, both simulation results and hardware verifications obtained from a 5-kW prototype circuit demonstrate the performance and feasibility of the proposed multi-mode current control strategy.

並列關鍵字

Current control ； Energy storage system ； Three-phase inverter

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