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Load prediction current calculation device for power quality controller and method thereof

A technology of load forecasting and power quality, applied in the direction of circuit devices, forecasting, calculations, etc., can solve problems such as performance degradation, high controller requirements, and complex control methods, and achieve an easy-to-achieve effect

Pending Publication Date: 2020-06-02
大连公共交通建设投资集团有限公司 +2
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Problems solved by technology

The application of adaptive control, feedback linearization decoupling control, passive control and intelligent control in active power filters has promoted the development of active power filters, but these control methods are more complicated and require more controllers High, and the performance degradation caused by the calculation delay is serious

Method used

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  • Load prediction current calculation device for power quality controller and method thereof
  • Load prediction current calculation device for power quality controller and method thereof
  • Load prediction current calculation device for power quality controller and method thereof

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with accompanying drawing.

[0050] Such as figure 1 As shown, a load prediction current calculation method of a power quality controller includes a load prediction current calculation method when only compensating harmonic currents and a load prediction current calculation method when compensating reactive power and harmonic currents at the same time. The load prediction current calculation method at the time of harmonic current comprises the following steps:

[0051] Step 1. Perform ABC / DQ conversion on the detected load current, and describe it by formula (1),

[0052]

[0053] In the formula, xa represents the current of phase A of the load, xb represents the current of phase B of the load, xc represents the current of phase C of the load, xd represents the transformed D-axis load current, xq represents the transformed Q-axis load current, T2 / 3 Indicates that the three-phase electric current i...

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Abstract

The invention relates to the technical field of intelligent power grids, in particular to a load prediction current calculation device and method for a power quality controller. The method comprises the following steps: (1) carrying out ABC / DQ conversion on a detected load current; (2) carrying out low-pass filtering; (3) predicting the load current; (4) carrying out DQ / ABC conversion. The devicecomprises an apparatus for calculating the load prediction current when only the harmonic current is compensated and an apparatus for calculating the load prediction current when the reactive power and the harmonic current are compensated simultaneously. Mainly aiming at the electric energy quality problem caused by the electrified railway, the device achieves the overall extraction of reactive, harmonic and three-phase unbalanced components generated in the electrified railway, the components serve as control commands of an inverter after being reversed, and comprehensive treatment of the electric energy quality of the electrified railway is achieved. Compared with a traditional load prediction current calculation method, the method has the advantages of simplicity, effectiveness, reliability, easiness in implementation and the like.

Description

technical field [0001] The invention relates to a device for calculating load and predicting current for a power quality controller and a method thereof, belonging to the technical field of smart grids. Background technique [0002] With the deepening of the electrification process, the load types of the power system have also undergone tremendous changes. It is worth mentioning that electrified railways are produced with the emergence of electric locomotives, because electric locomotives themselves do not have their own energy, and require a continuous supply of electric energy from the power supply system along the railway to drive the vehicles. There are two types of power supply for electric locomotives: DC system and AC system. The DC system is to supply DC power to the catenary after the high-voltage, three-phase power is stepped down and rectified in the traction substation. The AC system is to supply AC power to the catenary after the high-voltage, three-phase power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/16G06Q10/04H02J3/00
CPCG06Q10/04G06F17/16H02J3/00Y02E40/30
Inventor 苏霄张光普杨华王恩波杜红宇任顺利钱嘉怡赵海春高扬董雪武郑航曾繁鹏
Owner 大连公共交通建设投资集团有限公司
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