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Reactive control method and reactive controller for flexible direct current power transmission network

A flexible DC and passive control technology, applied in the direction of AC networks with the same frequency from different sources, can solve problems such as fluctuations, achieve the effect of eliminating delay and enhancing stability

Inactive Publication Date: 2017-02-22
XUJI GRP +3
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Problems solved by technology

[0005] The present invention provides a passive control method and a passive controller of a flexible direct current transmission network, which are used to solve the problem that the reference value of the frequency and phase of the AC voltage on the grid side is directly given manually when the flexible direct current transmission network is in the island mode And the problem of fluctuations, to achieve a smooth transition between the flexible HVDC grid interconnection mode and the island mode

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  • Reactive control method and reactive controller for flexible direct current power transmission network
  • Reactive control method and reactive controller for flexible direct current power transmission network

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Embodiment Construction

[0019] The present invention provides a passive control method and a passive controller of a flexible direct current transmission network, which are used to solve the problem that the reference value of the frequency and phase of the AC voltage on the grid side is directly given manually when the flexible direct current transmission network is in the island mode The problem of fluctuations is caused, and the smooth transition between the flexible DC transmission grid networking mode and the island mode is realized.

[0020] The flexible DC transmission network is composed of three-phase six bridge arms, such as figure 1 As shown, each bridge arm is composed of an inductor cascaded with several identical sub-modules, and each sub-module contains two IGBTs, two reverse diodes and a DC capacitor. The voltage source converter of the flexible DC transmission network adopts double-loop dq decoupling control, the inner loop is the current loop, and when the flexible DC transmission n...

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Abstract

The invention provides a reactive control method and a reactive controller for a flexible direct current power transmission network. The reactive control method comprises the steps of performing control in switching from a grid-connected mode into an island mode of the flexible direct current power transmission network; and locking d and q components of a grid-side alternating current voltage before the switching from the grid-connected mode into the island mode of the flexible direct current power transmission network, and taking the locked d and q components as the reference values of the d and q components of the grid-side alternating current voltage in the island mode, and performing PI control on the grid-side alternating current voltage. According to the technical scheme provided by the invention, when the flexible direct current power transmission network is in the island mode, the reference values of the d and q components of the grid-side alternating current voltage are not artificially given; instead, the reference values of the d and q components are the d and q components of the grid-side alternating current voltage before the switching from the grid-connected mode into the island mode, so that fluctuation of the flexible direct current power transmission network is not caused.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a passive control method and a passive controller of a flexible direct current transmission network. Background technique [0002] In order to solve the problem of energy shortage and meet the needs of sustainable development with low energy consumption, wind energy, solar energy and other renewable clean energy power generation have been vigorously developed and utilized. Due to the shortcomings of new energy power generation such as unstable power supply quality and long distance from the AC grid, when the new energy power station transmits power to the AC grid, if the traditional AC power transmission method or the DC power transmission method based on the current source converter is adopted, then The required cost is higher. [0003] In order to solve the above problems, most of the current new energy power stations use flexible DC transmission grid techn...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06
Inventor 赵倩孔令凯郝俊芳严兵张群陈朋范雪峰
Owner XUJI GRP
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