Method for enabling SVG (static var generator) to perform reactive compensation normally with one-phase ground
A single-phase grounding and power compensation technology, applied in the direction of reactive power adjustment/elimination/compensation, flexible AC transmission system, etc., can solve problems such as inability to compensate reactive power of the grid, single-phase grounding fault, grounding phase voltage reduction, etc. , to achieve the effect of accurate compensation, stability and reliability guarantee
Active Publication Date: 2013-07-31
HEBEI XUHUI ELECTRIC
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Problems solved by technology
However, in the actual operation of the power grid, a single-phase ground fault is likely to occur. When a single-phase ground fault occurs, the power grid system still needs to compensate reactive power
[0003] However, the connection mode of the three-phase voltage transformer in the power grid system adopts the star-connected neutral point grounding method. When the power grid system is grounded, the three-phase voltage signal collected by the three-phase voltage transformer is: The phase voltage increases; therefore, the three-phase voltage output by the voltage transformer after the system is grounded cannot truly reflect the phase voltage of the grid system
At this time, the SVG can only exit the operation, and cannot compensate the reactive power for the grid
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[0017] The present invention will be further described in detail below with reference to the drawings and specific embodiments.
[0018] When the dynamic reactive power compensation device SVG is applied to the grid to compensate the grid reactive power, it is necessary to collect the three-phase voltage value and three-phase current value of the grid system through the voltage transformer and current transformer set on the grid side, and perform the grid Calculation of reactive power to be compensated.
[0019] The dynamic reactive power compensation device SVG mainly includes the main switch cabinet, incoming cabinet, start cabinet, power cabinet and control system. The main switch cabinet, incoming cabinet, start cabinet and power cabinet are connected in series on the secondary side bus of the power grid in sequence. The control system is respectively connected with the starter cabinet and the power cabinet, and is used to calculate the reactive power according to the collected...
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The invention relates to a method for enabling SVG (static var generator) to perform reactive compensation normally with one-phase ground. The method comprises the following steps: a, calculating three-phase imbalance voltage of a neutral point when a power grid system is subjected to one-phase ground; b, calculating actual phase voltages of three phases when the power grid system is subjected to one-phase ground; and c, performing operation about reactive power compensation of SVG by taking the obtained actual phase voltages of the three phases as reference voltage signals for taking part in operation. With application of the algorithm, the SVG can perform reactive power compensation stably, quickly and accurately to the power grid system when the power grid system is subjected to a one-phase ground failure, so that a guarantee is provided for stability and reliability of safe operation of the power grid.
Description
Technical field [0001] The invention relates to the technical field of power distribution network grounding, in particular to a method for SVG to operate normally when the power grid is single-phase grounded. Background technique [0002] During the operation of the grid system, reactive power compensation is required for the grid to improve the power factor during grid operation and reduce grid losses. In recent years, the commonly used reactive power compensation equipment is the dynamic reactive power compensation device, or SVG for short. In the process of reactive power compensation for the power grid, SVG needs to accurately measure the phase voltage of the power grid to participate in the calculation. The current topological structure of SVG is mostly star-linked structure, and its compensation algorithm is realized by collecting the voltage signal of the three-phase voltage transformer in the power grid system, and the three-phase voltage should be within the error range ...
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Login to View More IPC IPC(8): H02J3/18
CPCY02E40/12Y02E40/10
Inventor 张旭辉吴洪伟李瑞桂高志辉韩劲松董锁英郑金芝耿占辉
Owner HEBEI XUHUI ELECTRIC