Secondary Model Predictive Control Architecture for VSC-HVDC Networks Interfacing Wind Power
Secondary Model Predictive Control Architecture for VSC-HVDC Networks Interfacing Wind Power
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DOI：
10.1109/tpwrd.2020.2966325
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发表时间：
2020-01
影响因子：
4.4
通讯作者：
Jesús Carmona Sánchez;O. Marjanovic;M. Barnes;Peter R. Green
中科院分区：
文献类型：
--
作者：
Jesús Carmona Sánchez;O. Marjanovic;M. Barnes;Peter R. Green
本文提出了一种基于二次模型预测控制(MPC)的结构，为接入风力发电的MT VSC-HVDC网络提供直流电压和直流功率控制。所提出的结构将控制器置于监控级，从而在现有变流器的局部下垂控制器之间提供协调。下垂控制是一种分散的直流电压/功率控制。因此，在次级控制器发生故障的情况下，下垂控制作为一种应急控制方案。MT VSC-HVDC网络的简化线性动态模型被用于MPC的设计，从而最大限度地减少了计算二次控制动作所需的计算量。在dq域中，下垂增益和离岸和陆上“AC”变量的更新被明确地视为MPC控制器公式中的测量输入扰动，从而确保适当的控制响应，以便将它们的变化对整个系统性能的不利影响降至最低，特别是在风力变化的情况下。仿真结果表明，基于系统简化线性模型设计的预测控制应用于PSCAD仿真的一个六端VSC-HVDC网络的高保真非线性全阶模型时，能够获得令人满意的性能。
This paper proposes a secondary Model Predictive Control (MPC) based architecture to provide DC voltage and DC power control to MT VSC-HVDC networks interfacing wind power generation. The proposed architecture places the controller at a supervisory level, thus providing coordination amongst existing converters’ local droop controllers. Droop control is a type of decentralized DC voltage/power control. Hence, in case of secondary controller failure, droop control acts as a contingency control scheme. A simplified linear dynamic model of the MT VSC-HVDC network is utilised for the MPC's design, thus minimizing computational effort needed to compute secondary control action. Updates of droop gains and offshore and onshore “AC” variables, in the dq domain, are explicitly considered as measured input disturbances within the formulation of the MPC controller, thus, ensuring appropriate control response in order to minimise adverse impact of their variation on the overall system's performance, particularly under wind power variations. Simulation results show that MPC, whose design is based on the system's simplified linear model, is capable of delivering satisfactory performance when applied to the high fidelity non-linear full order model of a six-terminal VSC-HVDC network simulated in PSCAD.