發(fā)布時間：2019-02-28 14:18

【摘要】：電網(wǎng)換相換流器和模塊化多電平換流器(LCC-MMC)混合直流輸電系統(tǒng)兼顧了兩種換流器的技術優(yōu)勢和經(jīng)濟優(yōu)勢,具有較好的應用前景。無源網(wǎng)絡裝設容性濾波裝置能夠起到平滑交流電壓波形、提供電壓支撐等作用。首先通過理論推導,建立了含容性濾波裝置的模塊化多電平換流器數(shù)學模型,基于dq理論,提出了模塊化多電平換流器的無源解耦控制策略。針對送端電網(wǎng)換相換流器側交流故障可能導致的功率中斷等問題,從電網(wǎng)換相換流器和模塊化多電平換流器的控制機理出發(fā),分析了故障階段及故障后的系統(tǒng)響應特性,并進而提出了送端交流故障穿越附加控制策略。為驗證上述控制策略的有效性,在PSCAD/EMTDC內建立了一個LCC-MMC混合直流輸電模型。通過受端電壓頻率變化和送端交流故障仿真,驗證了所提控制策略的可行性和有效性。
[Abstract]:The hybrid DC transmission system of the power grid converter and the modular multi-level converter (LCC-MMC) takes the technical advantages and economic advantages of the two converters into consideration, and has a good application prospect. The passive network is provided with a capacitive filtering device to function as a smooth alternating current voltage waveform and a voltage support, and the like. Firstly, the mathematical model of the modular multilevel converter with the capacitive filter is established, and the passive decoupling control strategy of the modular multilevel converter is proposed based on the dq theory. Based on the control mechanism of the converter and the modular multilevel converter, the system response characteristics of the fault phase and the fault are analyzed. In addition, an additional control strategy is proposed for the end-to-end AC fault. To verify the effectiveness of the control strategy, an LCC-MMC hybrid DC transmission model was established in PSCAD/ EMTDC. The feasibility and effectiveness of the proposed control strategy are verified by the terminal voltage frequency variation and the end-to-end AC fault simulation.
【作者單位】： 國網(wǎng)浙江省電力公司電力科學研究院;浙江大學電氣工程學院;國網(wǎng)浙江省電力公司湖州供電公司;
【分類號】：TM721.1

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本文編號：2431874