【摘要】：針對模塊化多電平換流器柔性直流(modular multilevel converter-high voltage direct current,MMC-HVDC)輸電系統(tǒng)橋臂阻抗不對稱運行環(huán)流問題,推導了上、下橋臂阻抗不對稱運行時子模塊輸出電壓與橋臂電流特性,闡述了此時橋臂電流基頻成分,指出了換流器環(huán)流成分含有直流分量、基頻分量、二倍頻分量以及三倍頻分量,直流側(cè)電流會產(chǎn)生波動;提出一種MMC-HVDC系統(tǒng)橋臂阻抗不對稱環(huán)流抑制策略,該策略將比例-積分控制與有限控制集模型預測控制相結(jié)合,計算換流器所有開關(guān)狀態(tài)下綜合目標函數(shù),根據(jù)環(huán)流抑制目標函數(shù)最小值和環(huán)流抑制補償電平調(diào)節(jié)綜合目標函數(shù)最小值對應的開關(guān)狀態(tài)。該控制策略能夠很好地抑制環(huán)流交流成分,減小了直流側(cè)電流波動,使得橋臂阻抗不對稱所在相上、下橋臂子模塊輸出電壓之和基頻分量、二倍頻分量以及三倍頻分量對稱分布。仿真結(jié)果驗證了所提控制策略的可行性和有效性。
[Abstract]:In order to solve the problem of asymmetrical operation circulation of bridge arm impedance in modular multilevel converter flexible DC (modular multilevel converter-high voltage direct current,MMC-HVDC transmission system, the output voltage and bridge arm current characteristics of upper and lower bridge arm impedance asymmetric operation are derived, the fundamental frequency components of bridge arm current are described, and it is pointed out that the circulation component of converter contains DC component, fundamental frequency component, double frequency component and triple frequency component. The current on the DC side will fluctuate. In this paper, a bridge arm impedance asymmetric circulation suppression strategy for MMC-HVDC system is proposed, which combines proportional integral control with finite control set model predictive control to calculate the integrated objective function in all switching states of the converter, and adjusts the switching state corresponding to the minimum value of the synthetic objective function according to the minimum value of the circulation suppression objective function and the circulation suppression compensation level. The control strategy can suppress the circulation AC component well, reduce the current fluctuation on the DC side, and make the symmetrical distribution of the sum fundamental frequency component, double frequency component and triple frequency component of the output voltage of the lower arm module on the phase where the impedance asymmetry of the bridge arm is located. The simulation results verify the feasibility and effectiveness of the proposed control strategy.
【作者單位】： 華北電力大學電氣與電子工程學院;國網(wǎng)山東省電力公司濟南供電公司;國網(wǎng)北京朝陽供電公司;國網(wǎng)滄州供電分公司;
【基金】：國家自然科學基金資助項目(51607069) 河北省自然科學基金資助項目(E2015502012) 中央高校基本科研業(yè)務費專項基金資助項目(2016MS88,2017MS091) 國家電網(wǎng)公司科技項目資助(SGHECZ00FCJS1700493)~~
【分類號】：TM721.1

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