计及不平衡功率最优分配的直流电压斜率控制策略研究
发布时间：2018-12-18 15:11
【摘要】：针对多端直流输电(multi-terminal HVDC transmission,MTDC)系统中负荷变化引起功率分配不平衡问题,该文提出计及不平衡功率最优分配(optimal unbalanced power allocation,OUPA)的直流电压斜率控制策略,采用包含处理层和执行层的分层控制方式。通过处理层建立OUPA数学模型,该数学模型以产生不平衡功率后额外产生的发电费用最小为目标函数,以线路容量、发电机容量、换流站容量及功率平衡为限制约束,应用拉格朗日乘子法求解模型最优解,通过执行层实现OUPA。在Matlab/Simulink平台搭建5端电压源型变换器MTDC仿真模型,分别对MTDC系统在正常工作、某一端换流站功率发生突变、某一端换流站退出运行等3种工况进行仿真。结果表明,该方法在非故障工况下的发电费用显著降低,在故障工况下直流电压保持稳定,功率平衡,控制结构简单,鲁棒性强,易于实现。
[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.
【作者单位】： 上海交通大学电子信息与电气工程学院;嘉兴清源电气科技有限公司;上海纳杰电气成套有限公司;
【基金】：国家863高技术基金项目(2014AA052005) 国家自然科学基金项目(51377105) 上海市闵行区产学研合作计划(2014MH103)~~
【分类号】：TM721.1
本文编号：2386029
[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.
【作者单位】： 上海交通大学电子信息与电气工程学院;嘉兴清源电气科技有限公司;上海纳杰电气成套有限公司;
【基金】：国家863高技术基金项目(2014AA052005) 国家自然科学基金项目(51377105) 上海市闵行区产学研合作计划(2014MH103)~~
【分类号】：TM721.1
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