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首页> 外文期刊>Electric power systems research >An adaptive time-graded control method for VSC-MTDC networks
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An adaptive time-graded control method for VSC-MTDC networks

机译：VSC-MTDC网络的自适应时间分级控制方法

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摘要

Power flow and voltage control, beside other challenges such as DC faults, are the main concerns in the operation of multi-terminal HVDC (MTDC) networks. This paper proposes a novel DC voltage control method, which is inspired from the principles of power system protection, for VSC-based MTDC networks. This time-graded control method periodically ranks all converters; the highest priority one is dedicated to regulate the network voltage while the others operate in the power control mode. In abnormal conditions in which the grid-forming converter cannot solely control the network voltage, a sufficient number of converters are sequentially turned to the voltage control mode according to their priority. Upon recovering from the abnormal condition, the proposed controller with its conditional reclosing ability returns these mode-changed converters to the power control mode. Since the proposed method regulates the voltage of MTDC network by the minimum number of converters, the maximum ones can be employed in power flow control. Proposing an adaptive procedure to calculate appropriate mode change delays is another contribution of this communication-less control method. Simulation of a test network in MATLAB/Simulink under various conditions with both proposed and conventional droop controllers verifies the outstanding abilities of the proposed method.
机译：电流和电压控制在其他挑战（如DC故障）之外，是多终端HVDC（MTDC）网络运行中的主要问题。本文提出了一种新型直流电压控制方法，它受到基于VSC的MTDC网络的电力系统保护原理的启发。这种时分控制方法定期排列所有转换器;最高优先级专用于调节网络电压，而其他则在电源控制模式下操作。在网格形成转换器不能仅控制网络电压的异常条件下，根据其优先级顺序地转换足够数量的转换器。在从异常情况下恢复后，所提出的控制器具有其条件的重构能力将这些模式更改的转换器返回到功率控制模式。由于所提出的方法通过最小转换器的最小数量调节MTDC网络的电压，因此可以在功率流控制中使用最大值。提出要计算适当模式变化延迟的自适应过程是这种无通信控制方法的另一个贡献。在具有诸如建议和传统的下垂控制器的各种条件下，在MATLAB / Simulink中的测试网络仿真验证了所提出的方法的出色能力。

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