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A generalized voltage droop strategy for control of multi-terminal DC grids

機譯：用于控制多端DC電網(wǎng)的廣義電壓下垂策略

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摘要

This paper proposes a generalized voltage droop (GVD) control strategy for control and power sharing in voltage source converter (VSC)-based multi-terminal DC (MTDC) grids. In the proposed approach, the conventional voltage droop characteristics of voltage-regulating VSC stations are replaced by the GVD characteristics. The proposed GVD control strategy can be operated in three different control modes including conventional voltage droop control, fixed active power control and fixed DC voltage control by proper adjustment of the GVD characteristics of the voltage-regulating converters. The proposed strategy improves the control and power-sharing capabilities of the conventional voltage droop, and enhances its maneuverability. Simulation results, obtained by detailed modeling in a four-terminal high voltage DC grid demonstrated the efficacy of the proposed approach and its flexibility in active power sharing. Moreover, based on the obtained results, switching between operating mode of the GVD control approach does not results in oscillations of the active powers flowing inside the MTDC grids.
機譯：本文提出了一種通用的電壓降（GVD）控制策略，用于基于電壓源轉(zhuǎn)換器（VSC）的多端子DC（MTDC）電網(wǎng)中的控制和功率共享。在提出的方法中，調(diào)壓VSC站的常規(guī)電壓下降特性被GVD特性代替?？梢酝ㄟ^適當(dāng)調(diào)節(jié)調(diào)壓轉(zhuǎn)換器的GVD特性，以三種不同的控制模式來操作提出的GVD控制策略，包括常規(guī)電壓下降控制，固定有功功率控制和固定DC電壓控制。所提出的策略改善了常規(guī)電壓降的控制和功率共享能力，并增強了其可操作性。通過在四端高壓直流電網(wǎng)中進行詳細建模而獲得的仿真結(jié)果證明了該方法的有效性及其在有功功率共享中的靈活性。而且，基于獲得的結(jié)果，在GVD控制方法的操作模式之間進行切換不會導(dǎo)致MTDC電網(wǎng)內(nèi)部流動的有功功率發(fā)生振蕩。

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