柔性直流雙向變換器及其控制策略研究
張保1,鄒學毅1,嚴建海1,武遠征2
(1 南京國臣直流配電科技有限公司,江蘇 南京 211100;2 遼寧工業(yè)大學 電子與信息工程學院,遼寧 錦州 121000)
摘 要:研制了一種柔性直流配電儲能式雙向DC-DC變換器,在直流母線和儲能裝置間建立雙向功率通道,以解決配電網(wǎng)母線電壓波動大的問題。設(shè)計兩相Buck-Boost交錯并聯(lián)結(jié)構(gòu),采用新型數(shù)字式精確恒壓、恒流、恒功率控制策略,提高了變換器輸出側(cè)頻率和穩(wěn)態(tài)特性。試驗表明,雙向變換器在不同工作模式下均能正常工作,并可實現(xiàn)工作模式靈活切換以及自動恒壓、恒流功能,通過對交錯并聯(lián)電感電流的均衡控制,保證了變換器高效大功率和低紋波的輸出,在實際配電系統(tǒng)實驗中驗證了該變換器可靠性。
關(guān)鍵詞:雙向變換器;柔性;控制策略;交錯并聯(lián)
中圖分類號:TM76 文獻標識碼:A 文章編號:1007-3175(2020)08-0012-05
Research on Flexible DC Bi-Directional Converter and Its Control Strategy
ZHANG Bao1, ZOU Xue-yi1, YAN Jian-hai1, WU Yuan-zheng2
(1 Nanjing Golden Cooperate DC Power Distribution Technology Co., Ltd, Nanjing 2111 00, China;
2 School of Electronics and Information Engineering, Liaoning University of Technology, Jinzhou 121000, China)
Abstract: A bi-directional DC-DC converter is developed which establishes a high-power transmission channel between the DC bus and the energy storage device for flexible DC power distribution system to solve the problem that large voltage fluctuation of the DC bus. A twophase interleaved parallel structure Buck-Boost circuit is devised and a new digital precise control strategy of constant voltage, constant current and constant power is adopted to improve the frequency and steady-state characteristics of the output side of the converter. The test results show that the bi-directional converter proper function in different working modes,it can also realize flexible switching of working modes and automatic constant voltage and constant current functions. In addition, the current balance control of interleaved and parallel inductance is realized, which ensures the high efficiency, high power and low ripple output of the converter. Finally, the reliability of the converter has been verified in actual power distribution experiments.
Key words: bi-directional converter; flexible; control strategy; interleaved parallel
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