Chained SVG DC bus voltage control method and control system

A technology of DC bus voltage and control method, which is applied in flexible AC power transmission system, AC network circuit, electrical components, etc., and can solve problems such as unbalanced SVG DC bus voltage
CN112701694AActive Publication Date: 2021-04-23GUANGDONG UNLIMITED POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGDONG UNLIMITED POWER CO LTD
Publication Date
2021-04-23

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Abstract

The invention discloses a chained SVG direct current bus voltage control method and system. The chained SVG direct current bus voltage control method comprises the following steps that: the amplitude and phase angle of the positive sequence voltage of each phase and the amplitude and phase angle of the negative sequence voltage of each phase are calculated; positive sequence current is calculated, which specifically comprises the following steps that: S21) the DC side average voltage of each phase link is calculated, S22) a three-phase active power average value and the active power of each phase are outputted, S23) the positive sequence active current of each phase is calculated, S24) the amplitude and the phase angle of the positive sequence current of each phase is calculated; negative sequence current is calculated, which comprises the following steps that: S31) a D-axis component and a Q-axis component of the negative sequence current of each phase are calculated, S32) the amplitude and the phase angle of the negative sequence current of each phase are calculated; and combination is performed to obtain a three-phase current given value of a chain type SVG current control loop. According to the control method and control system of the embodiment of the invention, a problem that the DC side voltage of a chain-type SVG link is not balanced can be solved, the overvoltage fault of a module in the link can be prevented, and the SVG can give full play to the reactive compensation.
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Description

technical field

[0001] The invention belongs to the technical field of power electronics, and in particular relates to a chained SVG DC bus voltage control method and a control system. Background technique

[0002] Static Var Generation (SVG for short) is widely used in many occasions such as compensating load reactive power and stabilizing grid voltage due to its many advantages such as fast reactive power adjustment and modular generation.

[0003] At present, most applications of star-linked SVG are based on the condition of power grid balance, but in practical applications, some unbalanced working conditions often appear in the power system. When asymmetrical faults, asymmetrical line impedance and other problems cause unbalanced grid voltage, the star-connected SVG DC bus voltage will be unbalanced, and even some modules will be overvoltage, which will cause SVG to go off-grid and affect the power grid. power quality. Contents of the invention

[0004] The present i...

Claims

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