【摘要】：針對多端直流輸電(multi-terminal HVDC transmission,MTDC)系統(tǒng)中負(fù)荷變化引起功率分配不平衡問題,該文提出計及不平衡功率最優(yōu)分配(optimal unbalanced power allocation,OUPA)的直流電壓斜率控制策略,采用包含處理層和執(zhí)行層的分層控制方式。通過處理層建立OUPA數(shù)學(xué)模型,該數(shù)學(xué)模型以產(chǎn)生不平衡功率后額外產(chǎn)生的發(fā)電費用最小為目標(biāo)函數(shù),以線路容量、發(fā)電機(jī)容量、換流站容量及功率平衡為限制約束,應(yīng)用拉格朗日乘子法求解模型最優(yōu)解,通過執(zhí)行層實現(xiàn)OUPA。在Matlab/Simulink平臺搭建5端電壓源型變換器MTDC仿真模型,分別對MTDC系統(tǒng)在正常工作、某一端換流站功率發(fā)生突變、某一端換流站退出運行等3種工況進(jìn)行仿真。結(jié)果表明,該方法在非故障工況下的發(fā)電費用顯著降低,在故障工況下直流電壓保持穩(wěn)定,功率平衡,控制結(jié)構(gòu)簡單,魯棒性強(qiáng),易于實現(xiàn)。
[Abstract]:Aiming at the imbalance of power distribution caused by load variation in multi-terminal direct current transmission (multi-terminal HVDC transmission,MTDC) systems, a DC voltage slope control strategy considering unbalanced power optimal distribution (optimal unbalanced power allocation,OUPA) is proposed in this paper. A hierarchical control method including processing layer and execution layer is adopted. The OUPA mathematical model is established by processing layer. The objective function of the mathematical model is to minimize the extra generation cost after generating unbalanced power, and the constraints are line capacity, generator capacity, converter station capacity and power balance. The Lagrange multiplier method is used to solve the optimal solution of the model, and the OUPA. is realized through the execution layer. The MTDC simulation model of 5-terminal voltage source converter is built on the Matlab/Simulink platform. The simulation results show that the MTDC system is working normally, the power of one end converter station has abrupt change, and one end converter station is out of operation. The results show that the cost of power generation is significantly reduced under non-fault conditions, and the DC voltage is stable, power balance is balanced, control structure is simple, robustness is strong, and it is easy to realize.
【作者單位】： 上海交通大學(xué)電子信息與電氣工程學(xué)院;嘉興清源電氣科技有限公司;上海納杰電氣成套有限公司;
【基金】：國家863高技術(shù)基金項目(2014AA052005) 國家自然科學(xué)基金項目(51377105) 上海市閔行區(qū)產(chǎn)學(xué)研合作計劃(2014MH103)~~
【分類號】：TM721.1

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