双h桥电流控制器的控制、动力学和操作

S. Balasubramaniam, J. Liang, C. E. Ugalde-Loo
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引用次数: 17

摘要

近年来,由于可再生能源特别是海上风能的整合,对高压直流电网的需求大大增加。直流电网内的电流是被动地由直流线路的电阻决定的。在复杂的直流电网中,不能通过调整各变流器的电压设定点来精确控制各电缆的电流流动,容易造成过载。为了提高支路的利用效率和电网的可靠性,必须对直流节点之间的电流进行重新调度。这可以通过引入串联电流控制器(CFC)来实现。本文讨论了双h桥CFC在网状直流电网上的运行和控制。目前提出了两种不同的CFC控制策略,即主从控制和单调制控制。在Simulink/ SimPowerSystems中建立了一个四端直流电网模型,分析了CFC在所提出的控制策略和直流故障下的动态性能。从系统功率损耗的角度对这些策略进行了比较。此外,还介绍了基于igbt的减容CFC的操作和控制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Control, dynamics and operation of a dual H-bridge current flow controller
In recent years, the demand for HVDC grids has greatly increased due to the integration of renewable energy, especially offshore wind energy. The current flow within the DC grid is passively determined by the resistance of the DC lines. In a complex DC grid, the current flow in each cable cannot be precisely controlled by adjusting the voltage set points of each converter and an overload may occur. In order to improve the efficiency of the branch utilization and the reliability of the grid, the current flow has to be rescheduled between DC nodes. This can be achieved by introducing a series current flow controller (CFC). This paper discusses the operation and control of a dual H-bridge CFC on a meshed connected DC grid. Two different strategies have been proposed to control the CFC, namely, master-slave control and single modulation control. A four-terminal DC grid has been modelled in Simulink/ SimPowerSystems to analyse the dynamic performance of the CFC under the proposed control strategies and a DC fault. The strategies have been compared in terms of system power losses. In addition, the operation and control of a reduced IGBT-based CFC is presented.
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