Compensation instruction current obtaining method, device and equipment

A technology of command current and acquisition method, applied in the field of rectifiers, can solve the problems of increasing the cost of the station DC system, reducing the power density of the station DC system, etc., to achieve the effect of improving user experience, simple structure, and fast system response

Active Publication Date: 2019-12-20
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional solution is to increase the capacitor value of the DC side of the rectifier, but this solution will increase the cost of the DC system for the station and reduce the power density of the DC system for the station

Method used

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  • Compensation instruction current obtaining method, device and equipment
  • Compensation instruction current obtaining method, device and equipment
  • Compensation instruction current obtaining method, device and equipment

Examples

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Embodiment 1

[0052] Embodiment 1, reference figure 1 , a single-phase low-ripple PWM rectifier structure suitable for station DC systems, the rectifier is composed of two parts, a rectification circuit and an active auxiliary circuit. The rectification circuit is composed of AC side inductance L, DC bus capacitor Cd, load equivalent resistance RL and power switch tubes S1-S4, which are used to ensure that the rectifier operates at unity power factor. The active auxiliary circuit is composed of power switch tubes S5-S6, inductor La and capacitor Ca. The auxiliary circuit reduces the ripple voltage of the DC bus by injecting bidirectional current into the DC bus.

[0053] Please refer to Figure 1 to Figure 4 According to an embodiment of the present invention, a single-phase low-ripple PWM rectifier current compensation instruction acquisition method suitable for station DC systems includes the following steps:

[0054] Step S101: Obtain the load current, grid voltage and DC side voltage ...

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Abstract

The invention relates to a compensation instruction current obtaining method, device and equipment suitable for a single-phase low-ripple PWM rectifier of a station DC system. The method comprises thesteps: obtaining a power grid current, a power grid voltage and a DC side voltage at a current moment; obtaining an angular frequency value and a phase value of the power grid voltage at the currentmoment by utilizing a phase-locked loop of a single-phase active filter; virtually constructing a two-phase orthogonal rotating coordinate system, and calculating the input active power and reactive power of a current PWM rectifier; and obtaining a compensation instruction current at the current moment according to the current rectifier input active power and reactive power. Therefore, the activepower and the reactive power are input by using the rectifier, so that the algorithm for obtaining the compensation instruction current is simpler, and the precision and the compensation effect of theobtained compensation instruction current are improved.

Description

technical field [0001] The present invention relates to the technical field of rectifiers, in particular to a compensation instruction current acquisition method, device and equipment for a single-phase low-ripple PWM rectifier suitable for station DC systems. Background technique [0002] At present, the station DC system is generally composed of two parts, the battery and the rectifier. During normal operation, the substation converts AC power into DC power through a rectifier, and then supplies the load with DC power, which causes the battery to work in a floating charge state most of the time. Therefore, the DC voltage ripple output by the rectifier will directly affect the life of the battery. [0003] At this stage, single-phase PWM rectifiers have been widely used in station DC systems because of their advantages such as high power factor and bidirectional power flow. However, no matter what control strategy is used in single-phase PWM rectifiers, single-phase PWM T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M1/15
CPCH02M1/15H02M7/219
Inventor 王中杰陶文彪解晓东李震宇王海鹏杨爱晟王亮俞华张伟王帅
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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