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Current transformer virtual synchronization control system under asymmetric power grid voltage and method thereof

A technology of grid voltage and virtual synchronization, applied in the direction of reducing the asymmetry of the polyphase network, eliminating/reducing the asymmetry of the polyphase network, etc., can solve the problem that the grid-connected converter cannot suppress the negative sequence current, etc. The effect of suppressing negative sequence current and good stability

Inactive Publication Date: 2015-09-09
STATE GRID CORP OF CHINA +3
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Problems solved by technology

[0004] Aiming at the defects of the prior art, the object of the present invention is a virtual synchronous control system and method for a converter under grid voltage asymmetry, aiming to solve the problem that grid-connected converters based on virtual synchronous control cannot suppress the power grid voltage asymmetry The problem with negative sequence current

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  • Current transformer virtual synchronization control system under asymmetric power grid voltage and method thereof
  • Current transformer virtual synchronization control system under asymmetric power grid voltage and method thereof
  • Current transformer virtual synchronization control system under asymmetric power grid voltage and method thereof

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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention clearer, 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.

[0023] figure 1 It shows a block diagram of a virtual synchronous control system for a converter with grid voltage asymmetry. For the convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:

[0024] The virtual synchronous control system of the converter with grid voltage asymmetry includes a synchronous controller 1, a power controller 2 and an instantaneous power calculator 3; the first input terminal of the instantaneous power calculator 3 is used to receive the grid voltage v gabc , the second input terminal of th...

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Abstract

The invention discloses a current transformer virtual synchronization control system under asymmetric power grid voltage and a method thereof. A cross-coupled structure of double phase-locked and amplitude-locked loops is adopted to directly control output voltage of a current transformer to be synchronized with a power grid so that output power of the current transformer is controlled. A synchronization controller is realized by adopting positive sequence and negative sequence phase-locked and amplitude-locked devices, and change of positive and negative sequence voltage can be respectively tracked so that synchronization between the current transformer and the power grid is realized when power grid voltage is asymmetric. With application of the system and the method, the current transformer is enabled to possess capability of spontaneously providing dynamic power support without time delay to the power grid, and negative sequence current outputted by the current transformer can be eliminated and fluctuation of active power and reactive power can be suppressed when power grid is asymmetric so that advantages of virtual synchronization control can be maintained, stability is great, dynamic power supply without time delay can be spontaneously provided to the power grid, negative sequence current outputted by the current transformer when power grid voltage is asymmetric can be effectively suppressed, and thus safe and stable operation of the current transformer can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and more specifically relates to a virtual synchronous control system and method for a converter under an asymmetric grid voltage. Background technique [0002] In recent years, with the rapid development of power electronics technology, virtual synchronous control, as an emerging converter control method in recent years, has attracted more and more attention due to its grid-friendliness and strong dynamic support capability. At present, the virtual synchronous control is mainly represented by the power synchronous control method that uses active power to realize the synchronization of the converter and the grid, which has good dynamic performance. network, resulting in a complex control structure in the start-up phase and the need for controller switching. [0003] In addition, when the grid voltage is asymmetrical, especially for a long time, since the filter reactor of the converter...

Claims

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Application Information

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IPC IPC(8): H02J3/26
CPCY02E40/50
Inventor 尚磊胡家兵袁小明刘刚王林
Owner STATE GRID CORP OF CHINA
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