Hierarchical optimal power flow control for loss minimization in hybrid multi-terminal HVDC transmission system
Hierarchical optimal power flow control for loss minimization in hybrid multi-terminal HVDC transmission system
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DOI：
10.17775/cseejpes.2016.00007
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发表时间：
2016-03
影响因子：
7.1
通讯作者：
Minxiao Han;Dong Xu;Lei Wan
中科院分区：
文献类型：
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作者：
Minxiao Han;Dong Xu;Lei Wan
针对混合型多端高压直流输电系统，提出了一种以损耗最小为目标的递阶控制方案。在该方案中，下层是下垂控制，能够快速响应功率波动，保证稳定的直流电压；上层是潮流优化控制，使混合式MTDC运行过程中的损耗最小，解决了损耗最小化和防止换相失败之间的矛盾。根据中国地区输电和风电场并网的潜在需求，在PSCAD中设计并仿真了6端混合型多端直流输电系统，验证了所提出的控制策略。首先进行了稳态分析，并与仿真结果进行了比较。分析表明，所提出的控制方案在满足系统约束的同时，达到了期望的最小损失。所提出的控制方案还保证了混合MTDC不仅具有良好的动态响应，而且在通信故障时仍保持稳定。
A hierarchical control scheme is proposed for optimal power flow control to minimize loss in a hybrid multiterminal HVDC (hybrid-MTDC) transmission system. In this scheme, the lower level is the droop control, which enables fast response to power fluctuation and ensures a stable DC voltage, and the upper level is power flow optimization control, which minimizes the losses during the operation of hybrid-MTDC and solves the contradiction between minimizing losses and preventing commutation failure. A 6-terminal hybrid-MTDC is also designed and simulated in PSCAD according to the potential demand of power transmission and wind farms integration in China to verify the proposed control strategy. First, the steady state analysis is conducted and then compared with simulation results. The analysis shows that the proposed control scheme achieves the desired minimum losses while at the same time satisfying system constraints. The proposed control scheme also guarantees that the hybrid-MTDC not only has a good dynamic response, but also remains stable during communication failure.