A low frequency oscillation damping control method for offshore wind power VSC-HVDC output system

A VSC-HVDC, low-frequency oscillation technology, applied in the field of AC power system low-frequency oscillation damping control, can solve problems such as difficulty in independently responding to new changes in power system operating characteristics, to ensure grid friendliness, maintain stable operation, and ensure safe and stable operation Effect

Inactive Publication Date: 2019-01-15
HUAZHONG UNIV OF SCI & TECH +2
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Problems solved by technology

With this change, the traditional damping control method will be difficult to indepen

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  • A low frequency oscillation damping control method for offshore wind power VSC-HVDC output system
  • A low frequency oscillation damping control method for offshore wind power VSC-HVDC output system
  • A low frequency oscillation damping control method for offshore wind power VSC-HVDC output system

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Embodiment Construction

[0025] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0026] The full-bridge type MMC AC voltage boosting operation method of the embodiment of the present invention comprises the following steps:

[0027] (1) Collect the three-phase voltage U of the grid-connected point of the converter station on the inverter side of the DC transmission system abc , three-phase current i abc , DC voltage U dc is the input signal;

[0028] (2) For the collected grid-connected point three-phase voltage U abc , obtain the frequency ω of the AC grid connected to the inverter station of the DC transmission system through the phase-locked loop g ; For the collect...

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Abstract

The invention discloses a low frequency oscillation damping control method for an offshore wind power VSC-HVDC output system; Specifically for the offshore wind power via VSC-HVDC output system, in AC/DC hybrid system, DC system operates at rated power, and AC system oscillates at low frequency due to large disturbance, so it is necessary to add damping controller to restrain low frequency oscillation. The invention only needs to be implemented in The DC voltage control of VSC- HVDC converter station and the frequency-based predecessor control only need a proportional link and a filter link.The frequency-based predecessor control of HVDC converter station only needs a proportional link and a filter link. When the low frequency oscillation occurs after the disturbance of AC power network,the change of frequency signal is transmitted to DC voltage, The change of DC voltage will cause the change of active power and damp the low frequency oscillation of AC system, which can not only keep the stable operation of the converter station, but also provide better damping effect for the low frequency oscillation of AC system connected with the converter station, and guarantee the VSC- HVDCdc system operation safety and stability and the friendliness of power grid.

Description

technical field [0001] The present invention belongs to the field of safe operation of power systems, and more specifically, relates to a low-frequency oscillation of an AC power system for an offshore wind power VSC-HVDC (Voltage Source Converter based High Voltage Direct Current Transmission) output system damping control method. Background technique [0002] Low-frequency oscillation is an inherent property of power systems. Continuous oscillations will limit the transmission capacity of transmission lines, and even cause system disconnection in severe cases. The frequency range of low-frequency oscillation is generally 0.1-2Hz, which involves the oscillation between the generator in a power plant and other parts of the power grid, which is called local oscillation (about 1-2Hz); it involves the oscillation between multiple generators between regions. Oscillation, called interval oscillation (about 0.1 ~ 0.7Hz). [0003] The most commonly used measure to suppress low-fr...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/38H02J3/36
CPCH02J3/24H02J3/36H02J3/386H02J2003/365Y02E10/76Y02E60/60
Inventor 雷宪章杨杰吴亚楠周啸孔明韩丛达胡家兵章晓杰
Owner HUAZHONG UNIV OF SCI & TECH
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