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A VSC-HVDC AC Voltage-Frequency Coordinated Control Method for Improving AC System Transient Stability

A VSC-HVDC, transient stability technology, applied in the field of power system control, can solve problems such as conflicts and unfavorable AC system transient stability

Active Publication Date: 2016-10-05
YUNNAN POWER GRID
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Problems solved by technology

[0007] However, the current VSC control strategy does not consider various control objectives in the transient process (1. The VSC-HVDC DC voltage remains stable; 2. The fault current on the valve side of the VSC can be controlled when the AC side of the VSC is faulty; 3. The AC bus voltage of the VSC is controlled at Safety range; 4. The VSC AC side system frequency control is within the safety range) may conflict, so it may be detrimental to the transient stability of the AC system connected to the VSC-HVDC

Method used

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  • A VSC-HVDC AC Voltage-Frequency Coordinated Control Method for Improving AC System Transient Stability
  • A VSC-HVDC AC Voltage-Frequency Coordinated Control Method for Improving AC System Transient Stability
  • A VSC-HVDC AC Voltage-Frequency Coordinated Control Method for Improving AC System Transient Stability

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Embodiment Construction

[0054] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0055] In order to realize the four transient control objectives and priority order of the VSC AC voltage-frequency coordinated control strategy, this embodiment redesigns the VSC-HVDC control characteristics.

[0056] like figure 1 In the schematic diagram of the VSC basic structure shown, U s is the effective value of the AC voltage of the bus on the VSC network side, u sj Respectively, the three-phase AC voltage of the VSC grid-side bus, u sd and u sq are the d-axis component and q-axis component of the three-phase AC voltage of the VSC grid-side bus, respectively, i sj are the three-phase AC current at the outlet of the VSC grid side, i vd and i vq are the d-axis component and q-axis component of the three-phase AC current on the VSC valve side,...

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Abstract

The invention discloses a coordination control method of VSC-HVDC (voltage source converter based high voltage direct current) alternating-current voltage-frequency for improving the transient stability of an alternating-current system. An alternating-current voltage-frequency coordination control target is increased in a transient state control target of a VSC station; the control strategy can be involved in transient state control of voltage and frequency of the alternating-current system by utilizing reactive and active rapid adjustment capability of VSC-HVDC respectively on the premise of guaranteeing the running safety of VSC-HVDC equipment. Based on the strategy, the invention designs a VSC controller structure capable of controlling the target priority ranking seriously, so that the transient state stability of voltage and frequency of a weak alternating-current power grid linked to the VSC can be improved effectively.

Description

technical field [0001] The invention belongs to the technical field of power system control, and in particular relates to a VSC-HVDC AC voltage-frequency coordinated control method for improving the transient stability of an AC system. Background technique [0002] Voltage source converter based high voltage direct current (VSC-HVDC) adopts self-shutdown power electronic devices, which can achieve commutation without external commutation voltage, so it can be used to connect weak AC grid. [0003] In the current power grid structure in my country, regional local power grids are mainly connected to the main grid through AC lines. When the AC connection between the regional local power grids and the main grid is weak and the channel flow is heavy, the system is prone to transient stability and small disturbance stability. Poor issues. With the gradual maturity of VSC-HVDC technology, it has become a new choice to use VSC-HVDC to asynchronously connect regional local grids and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/12H02J3/24
CPCH02J3/002H02J3/16H02J3/24H02J3/36Y02E60/60
Inventor 游广增钱迎春徐政刘昇肖亮于洋
Owner YUNNAN POWER GRID
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