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Positive and negative order double ring stacking control method of electric power distribution static state synchronous compensator based on instantaneous power balance

A static synchronous compensation and instantaneous power technology, applied in reactive power compensation, flexible AC transmission system, AC network voltage adjustment, etc., can solve the problems of burning out DSTATCOM devices, controller performance deterioration, etc., and achieve good economic and social benefits , Compensate the three-phase voltage unbalance and improve the effect of power quality

Inactive Publication Date: 2008-07-30
HUNAN UNIV
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Problems solved by technology

However, the unbalanced situation in the actual grid is common. When the grid voltage is asymmetrical, the performance of the controller based on the symmetric assumption will deteriorate, and in more serious cases, the DSTATCOM device will be burned.

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  • Positive and negative order double ring stacking control method of electric power distribution static state synchronous compensator based on instantaneous power balance
  • Positive and negative order double ring stacking control method of electric power distribution static state synchronous compensator based on instantaneous power balance
  • Positive and negative order double ring stacking control method of electric power distribution static state synchronous compensator based on instantaneous power balance

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Embodiment Construction

[0011] The working principle of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments:

[0012] As shown in Fig. 1, the present invention integrates the DSTATCOM based on the VSI-SPWM structure into the power grid through a coupling transformer after being filtered by an LC filter to adjust and balance the voltage of the distribution network. The main circuit of DSTATCOM is composed of three-phase voltage type inverter. The power switching device adopts the insulated gate bipolar transistor IGBT, and the DC side energy storage element is a capacitor C, which provides DC voltage support for the operation of the inverter. In order to filter out high-frequency burrs caused by power switching devices, an LC filter circuit is used in the output circuit of DSTATCOM. The connection between DSTATCOM and the power grid adopts a coupling transformer, and the transformation ratio of the transformer is 1:2. The invention ad...

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Abstract

The invention discloses a positive and negative sequence double-ring superposition control method of distribution static synchronous compensator based on instantaneous power balance, which consists of a positive sequence control ring and a negative sequence control ring. The method comprises following steps: deducing a current-voltage conversion formula in a d-q positive-sequence and negative-sequence coordinate system according to an instantaneous power balance formula to obtain a positive-sequence voltage modulation signal and a negative-sequence voltage modulation signal; superposing the positive-sequence voltage modulation signal and the negative-sequence voltage modulation signal to obtain a DSTATCOM output voltage modulation signal; and modulating by a triangular carrier wave to produce a PWM drive signal to control the action of an intelligent power module IPM to generate a required compensation voltage. The control method can achieve unbalanced three-phase voltage control of a common connection point, and the current-voltage conversion formula in the d-q positive-sequence and negative-sequence coordinate system is deduced by the instantaneous power balance formula, thus obviating complex mathematic operation in conventional current control method and further lowering the cost.

Description

technical field [0001] The invention relates to a control method of a distribution static synchronous compensator, in particular to a control method of a distribution static synchronous compensator (DSTATCOM) positive and negative sequence double-loop superposition based on instantaneous power balance. Background technique [0002] With the development of science and technology, the loads of rectifiers, electric arc furnaces, and electrified railways in the distribution network continue to increase. The impact and unbalanced power consumption characteristics of these loads have caused a series of power quality problems such as voltage fluctuations, flicker and three-phase imbalances in the distribution network. On the other hand, with the continuous development of modern industrial technology and the wide application of computer technology, electrical equipment is more sensitive to power quality, and the requirements for power quality are getting higher and higher. Poor pow...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/12H02J3/16
CPCY02E40/34Y02E40/16Y02E40/10Y02E40/30
Inventor 罗安欧剑波盘宏斌陈栋浣威魏承志
Owner HUNAN UNIV
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