SVG and SVC coordinated control method based on reactive power fluctuation frequency division
A technology of coordinated control and fluctuating frequency, applied in the direction of reactive power adjustment/elimination/compensation, AC network voltage adjustment, AC network circuit, etc. Work and other issues, to achieve the effect of high unit capacity cost, low cost, and slow response speed
Active Publication Date: 2015-05-13
SOUTHEAST UNIV
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Problems solved by technology
[0003] Loads with fast reactive power changes can easily cause voltage flicker, causing lighting flickering to affect vision, and causing sensitive loads such as experimental instruments or sophisticated manufacturing to fail to work normally, etc.
Theoretical derivation, simulation verification, and engineering practice all show that due to the limitation of response speed, SVC cannot track the rapidly changing reactive load, so it has no obvious effect on flicker phenomenon
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Embodiment Construction
[0019] The present invention will be further explained below in conjunction with the accompanying drawings.
[0020] Take the voltage flicker control of the electric arc furnace circuit as an example, such as figure 1 As shown, SVG is installed on the side near the power supply, and SVC is installed on the side near the electric arc furnace to jointly compensate the reactive power consumed by the electric arc furnace.
[0021] The principle of system control is as figure 2 As shown, a voltage transformer PT is installed at the compensation point, and a current transformer CT is installed at the SVC output terminal and the SVG output terminal. The AD analog-to-digital conversion chip converts the output of PT and CT into digital signals, and the DSP is responsible for calculating reactive power requirements and filtering processing. , Calculation of power factor and voltage flicker value, calculation of SVC and SVG compensation reference and a series of data processing tasks,...
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The invention discloses an SVG and SVC coordinated control method based on reactive power fluctuation frequency division. The method comprises the steps of filtering reactive power compensation demand value by using low frequency reactive power component as the reference of SVC reactive power compensation and high frequency component as the reference of SVG; adjusting the cutoff frequency of a filter to enable the system powder factor and the voltage flicker value to meet relevant standards; switching to the SVC priority compensation mode without filtering by using the reactive powder demand directly as the reference of SVC and the difference between the reactive power demand and the practical output of SVC as the reference of SVG when the SVG output current exceeds the limited value; and after a certain time, switching to the frequency division compensation mode. In combination with the characteristics of slower SVC response with lower unit capacity cost and faster SVG response with larger unit capacity cost, the method disclosed by the invention can coordinately control SVC and SVG, achieves the reactive power precise compensation under certain economic requirements and reduces the voltage flicker value.
Description
technical field [0001] The invention relates to the technical field of electric energy quality control, in particular to an SVG and SVC coordinated control method based on reactive power fluctuation frequency division. Background technique [0002] There are a large number of reactive loads in the power system, such as transmission lines, transformers, asynchronous motors, and electric arc furnaces all consume reactive power. The existence of reactive power has many disadvantages, such as increasing the loss of lines and equipment, occupying the capacity of lines and equipment, forming voltage drops on lines and equipment, and causing voltage stability problems. In order to reduce the adverse effects of reactive power, the principle of "layered and partitioned, on-site compensation" was proposed, and some reactive power compensation equipment has also been put into operation, such as traditional shunt capacitors, synchronous condensers, and static var compensators. (SVC), e...
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IPC IPC(8): H02J3/18
CPCH02J3/16H02J3/1842Y02E40/10
Inventor黄学良周仲柳王瑜姚新阳
OwnerSOUTHEAST UNIV