多功能太陽能微型逆變器之研製;Design and Implementation of Multi-Functional PV Micro Inverters

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题名:	多功能太陽能微型逆變器之研製;Design and Implementation of Multi-Functional PV Micro Inverters
作者:	張介寬;Chang, Jin-kuan
贡献者:	電機工程學系
关键词:	二次漣波電壓;主動拑位電流源推挽式轉換器;無感測輸入電流;最大功率點追蹤;變流器自主控制;second-order ripple voltage;active-clamped current-fed push-pull DC-DC converter;input current sensorless;maximum power point tracking;autonomous control of inverter
日期:	2017-07-25
上传时间:	2017-10-27 16:10:18 (UTC+8)
出版者:	國立中央大學
摘要:	本文研究克服二次漣波頻寬限制之太陽能微型變流器。所提出之太陽能微型變流器為兩級電路，前級使用主動拑位電流源推挽式轉換器，後級使用全橋式變流器。前級提出利用帶通濾波器產生前饋控制信號以降低原本二次漣波電壓控制信號，達成太陽能側較低二次漣波電壓；後級則提出利用積分器降低直流鏈電壓回授信號中的二次漣波電壓，以提高變流器的直流鏈電壓控制迴路頻寬，並利用變流器的電流振幅命令換算輸入電流信號，達成無輸入電流感測器之最大功率點追蹤。此外，針對多組太陽能微型變流器之並聯，提出新型變流器自主控制策略，模組之間無需通訊連結，得以使變流器除了併網模式外，亦可作在線互動模式及獨立模式之多模式操作。於獨立模式下即便無蓄電池儲能亦得以獨立供電，於在線互動模式下則可以滿足發電自用，達成無逆送功率之控制。最後，本論文設計240W之太陽能微型變流器，搭配德州儀器TMS320F28335數位信號處理器實現提出的控制策略，由一些模擬與實驗結果來證明所提出的控制方法有效性及可行性。;This dissertation studies the photovoltaic micro inverter which can overcome second-order ripple bandwidth limitation. The proposed two-stage photovoltaic (PV) inverter includes the front-end active-clamped current-fed push-pull DC-DC converter and the rear-end full-bridge DC-AC inverter. In the front-end, a feedforward control signal is generated by a band-pass filter to reduce the original second-order ripple of voltage control signal. The goal of no second-order ripple at the photovoltaic side is also achieved. In the rear-end, the use of an integrator to decrease the second-order ripple in the DC bus feedback voltage signal is proposed. Moreover, the maximum power point tracking of the PV module can be obtained without using the current sensor, the input current signal is obtained using the parameters of the inverter. In addition, for the multi-module PV micro inverter in parallel operating, a novel converter autonomous control strategy with no communication between the modules is presented. Therefore, multi-mode operation including grid-connected mode, line-interactive mode and stand-alone mode of the inverter is proposed. In the stand-alone mode, it can be an independent power supply even if there is no battery energy storage. Additionally, in the line-interactive mode, it can meet the power generation for self-support and achieve non-reverse power control. Finally, a 240W photovoltaic micro inverter with Texas Instruments TMS320F28335 digital signal processor (DSP) to achieve the proposed control strategies is built. The effectiveness and feasibility of proposed control methods are proved by some simulation and experimental results.
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