Hybrid Control Strategy for AC Voltage Stabilization in Bipolar VSC-MTDC

Hybrid Control Strategy for AC Voltage Stabilization in Bipolar VSC-MTDC
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双极性 VSC-MTDC 交流稳压混合控制策略

DOI:
10.1109/tpwrs.2018.2866131
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发表时间:
2019-01
影响因子:
6.6
通讯作者:
Zhang Xiao Ping
Zhang Xiao Ping
中科院分区:
工程技术1区
文献类型:
--
作者:
Li Zhou;He Yan;Li Ya Zhou;Gu Wei;Tang Yi;Zhang Xiao Ping

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使用VSC-MTDC进行风电场集成被认为是一种有前途的解决方案。为了提供稳定的交流电压控制和避免有功功率控制冲突,幅相控制策略,而不是有功/无功功率解耦控制策略,通常应用于连接到风电场的VSC。然而,使用这样的控制策略,潮流控制的灵活性将部分丧失。针对双极型电压源型逆变器中正负极直流网络可以独立运行的特点,提出了一种新的混合控制策略。在所提出的混合控制策略中,幅相控制和有功/无功解耦控制可以分别应用于正、负极点。因此,混合策略结合了幅相控制和有功/无功功率解耦控制的优点,可适用于大规模风电场并网的双极VSC-MTDC。PSCAD仿真结果表明,该混合控制策略能够为风电场并网提供稳定的交流电压控制和有功/无功潮流控制,并且有助于避免直流线路过载,稳定直流电压,提高功率传输能力。
Using VSC-MTDC for wind farm integration is considered to be a promising solution. In order to provide a stable ac voltage control and avoid active power control conflicts, the amplitude-phase control strategy, rather than the active/reactive power decoupled control strategy, is generally applied for the VSC connected to wind farms. However, using such a control strategy, the flexibility of power flow control will be partly lost. As the positive and negative pole dc networks in the bipolar VSC-MTDC can operate independently, a novel hybrid control strategy is proposed in this paper. In the proposed hybrid control strategy, the amplitude-phase control and active/reactive power decoupled control can be applied to the positive and negative poles, respectively. Hence, the hybrid strategy combines the advantages of the amplitude-phase control and active/reactive power decoupled control and can be adapted to bipolar VSC-MTDC for large-scale wind farm integration. Simulation results using PSCAD show that the hybrid control strategy can provide the stable ac voltage control and active/reactive power flow control for the integration of wind farms; moreover, such a hybrid control strategy is helpful to avoid the overload of dc lines, stabilize the dc voltage, and enhance the power transfer capability.
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