SVC reactive prediction and compensation method for rectifier load

A compensation method and rectifier technology, which can be applied to reactive power adjustment/elimination/compensation, emergency protection circuit devices for limiting overcurrent/overvoltage, AC network circuits, etc. See reports and other issues to achieve the effect of reducing response time, suppressing impact, and eliminating voltage flicker

Inactive Publication Date: 2011-07-06
RONGXIN POWER ELECTRONICS +1
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Problems solved by technology

[0009] At present, the reactive power prediction and compensation method of SVC equipment for rectifier load has not been reported

Method used

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  • SVC reactive prediction and compensation method for rectifier load
  • SVC reactive prediction and compensation method for rectifier load
  • SVC reactive prediction and compensation method for rectifier load

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Embodiment Construction

[0036] See Figure 1-Figure 4 , the SVC reactive power prediction and compensation method for the rectifier load. The technical key of this method lies in: first, how the rectifier controller accurately predicts and calculates the reactive power value of the DC load on the grid side; monitoring; the third is the correction of SVC compensation accuracy. 4. The time difference between the moment when the reactive power is emitted by the SVC equipment and the moment when the reactive power is generated by the rectifier is 3ms to 4ms, and the response time is short.

[0037] If the reactive power calculation of the rectifier is inaccurate, it will directly affect the flicker suppression effect. Therefore, when the rectifier controller calculates the reactive power of the load, it fully considers the influence of the voltage drop caused by the commutation impedance of the rectifier, and at the same time adjusts the calculation method in the case of SVC reactive power compensation ...

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Abstract

The invention relates to a static var compensator (SVC) reactive prediction and compensation method for a rectifier load. The method comprises the following steps of: 1) calculating a triggering angle and simultaneously calculating reactive power to be generated by a load by using a rectifier controller and transmitting the reactive power of the rectifier load to an SVC controller; 2) receiving prediction reactive power transmitted by the rectifier controller by using the SVC controller, acquiring the on-off state of a branch breaker of a filter, simultaneously acquiring a power grid current signal and a power grid voltage signal used for the calculation of a reactive compensation amount, and finally realizing trigger control compensation in a triggering angle manner; and 3) after predicting and compensating, compensating a deviation caused by the calculation of the reactive power through a proportion integration (PI) regulation link. The method has the advantages that: effective compensation of a large amount of rapid reactive power in the working process of the load can be realized by an SVC device; and the SVC device has short response time, can fulfill the aim of reactive power rapid compensation, can effectively inhibit the impact of the power grid caused by the reactive power, and eliminates a voltage flicker.

Description

technical field [0001] The invention relates to high-voltage SVC and high-current rectifier equipment, which is applied to the field where the rectifier is used as a load power supply and requires reactive power compensation. Background technique [0002] SVC static reactive power compensation equipment is currently the most widely used reactive power compensation equipment with the most mature technology. Reactive power support in the system power supply area or reactive power compensation for large power users. The application of SVC in the power system can enhance the power transmission capacity of the system, improve the stability of the power system, and has the functions of damping power oscillation, suppressing subsynchronous oscillation, and compensating power factor; SVC applied to large-scale power users can improve the user's power factor and save money. It also stabilizes the bus voltage and suppresses harmonics from being injected into the power system. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02H9/04
CPCY02E40/22H02H9/04H02J3/1842H02J3/18H02J3/1864Y02E40/12Y02E40/10Y02E40/20
Inventor 赵柏品张普红吴瑶林继如左强焦东亮黎军王飞义李海生王晓艳安万洙司明起时伟霍健金太英徐刚
Owner RONGXIN POWER ELECTRONICS
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