A comprehensive electric energy quality regulator

A power quality and regulator technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of high voltage withstand of parallel active filters, complex detection and control systems, and poor output tracking effects, etc., to achieve The output tracking effect is good, the voltage is reduced, and the effect is easy to realize by hardware

Inactive Publication Date: 2005-09-07
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] The above-mentioned integrated power quality conditioner has the following problems: ①The parallel active filter withstands a relatively large voltage (equal to the entire load voltage), so the required capacity is relatively large, and it has great technical difficulty, high cost and high equipmen

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  • A comprehensive electric energy quality regulator
  • A comprehensive electric energy quality regulator
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Embodiment Construction

[0029] The comprehensive power quality conditioner proposed by the present invention, such as figure 2 , 3 , 4, including: series active filter unit 1, parallel unit 5, measurement unit 3, control unit 7.

[0030] The series active filter unit 1 is connected in series to the system through the first transformer unit 1.2, and outputs a sinusoidal current through the control of the control unit 7, thereby forcing the system current to become sinusoidal, which plays a role in suppressing system current harmonics and dynamic recovery of load voltage , through appropriate control (as described later), it can also play a role in correcting the system power factor; the parallel unit 5 is composed of a parallel active filter unit 2 and a parallel passive filter unit 6 in series, and then connected in parallel to the system, The specified voltage is output through the control of the control unit 7 to stabilize the DC side voltage V dc Through proper control (as described later), it ...

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Abstract

The invention discloses a synthetic electric-energy quality regulator, comprising series and parallel active filter units, measuring unit and control units, where the parallel active filter unit is connected in series with parallel passive filter unit to compose a parallel unit, which is connected to the system; the series active filter unit is under the control of the series control unit and outputs sinusoidal current by the driving of all the switches of the first inverter unit; the parallel active filter unit is controlled by the parallel control unit and outputs an specific voltage by the driving of all the switches of the second inverter unit; the parallel passive filter unit is a LC filter circuit to provide a low resistance pass for harmonic current of a load and compensate reactive power of the load. The invention overcomes the shortages of large capacity and high manufacturing cost of the original parallel active filter; and has a better tracking effect and a better compensating effect, as well as higher performance/cost trade-off.

Description

technical field [0001] The invention belongs to the field of power system automation, in particular to a high-performance integrated power quality regulator. Background technique [0002] In recent years, the development of power electronic technology has made the non-linear, unbalanced and impact loads such as rectifiers, variable frequency speed control devices, electric arc furnaces, and electrified railways in the distribution network continue to increase. While these loads greatly improve production efficiency, they also bring power quality pollution problems to the power grid, such as harmonics, low power factor, unbalance, and voltage fluctuations and flicker. Unified Power Quality Conditioner (UPQC, also known as Unified Power Quality Controller) can comprehensively compensate for these power quality problems, and it is especially suitable for those who will not only cause power quality pollution to the system, but also greatly affect the power supply voltage change....

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/01H02J3/18
CPCY02E40/30Y02E40/40
Inventor 丁洪发段献忠朱庆春
Owner HUAZHONG UNIV OF SCI & TECH
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