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Serial-parallel mixed type filtering and protecting device of passive power

A technology of power filtering and protection devices, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve the problems that the total system current cannot be reduced, it is difficult to achieve the filtering effect, and the total system current increases. Achieve significant energy-saving effect, good filtering effect, and eliminate low-order harmonics

Inactive Publication Date: 2013-06-12
邯郸市恒山通用电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is affected by system parameters, and it is difficult to achieve the ideal filtering effect.
And when the parameters change or the matching is not good, it is easy to resonate with the system
For systems with high power factor, reactive power will be sent back to the system and cannot be put into operation
Moreover, it does not reduce, or even amplifies the harmonic current, which increases the total current of the system and has no energy-saving effect
[0004] Active filtering also cannot reduce the total current of the system. Due to the use of power electronic devices, the total loss is relatively large, and there is no energy-saving effect.

Method used

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  • Serial-parallel mixed type filtering and protecting device of passive power
  • Serial-parallel mixed type filtering and protecting device of passive power

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Effect test

Embodiment 1

[0023] Such as figure 1 As shown, the series-parallel hybrid passive power filter and protection device of the present invention includes a first reactor L1, a first capacitor C1, a transformer T1, a first single-phase thyristor Q1, and a second single-phase thyristor Q2 , the first varistor Y1, the second varistor Y2, the current limiting reactor L0, the arrester B1, the second reactor L2, the second capacitor C2, the third reactor L3, the third capacitor C3 and the vacuum contactor K ; The first reactor L1 is connected in series with the first capacitor C1 transformed by the transformer T1 to form a series resonant circuit, and resonates at the power frequency, connected between the power supply and the load, and connected in parallel with the second and third resonant branches on the load side , the first single-phase thyristor Q1 and the second single-phase thyristor Q2 are connected in series with the current-limiting reactor L0 and connected to both ends of the first cap...

Embodiment 2

[0030] Such as figure 2 As shown, the series-parallel hybrid passive power filter and protection device of the present invention is basically the same as that of Embodiment 1, the difference is: the first reactor L1, the second reactor L2, the third reactor L3 and the impedance transformation The transformer T1, the first capacitor C1, the second capacitor C2, and the third capacitor C3 are all three-phase.

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Abstract

The invention provides a serial-parallel mixed type filtering and protecting device of passive power. The serial-parallel mixed type filtering and protecting device of the passive power does not easily resonate with a system, effectively reduces total current of a system, and has an obvious energy-saving effect. The serial-parallel mixed type filtering and protecting device of the passive power comprises a first electric reactor (L1), a first capacitor (C1), a transformer (T1), a first sing-phase silicon controlled rectifier (Q1), a second single-phase silicon controlled rectifier (Q2), a first voltage dependent resistor (Y1), a second voltage dependent resistor (Y2), a current limiting reactor (L0), a lightning arrester (B1), a second electric reactor (L2), a second capacitor (C2), a third electric reactor (L3), a third capacitor (C3) and a vacuum contactor (K). According to the serial-parallel mixed type filtering and protecting device of the passive power, the serial-parallel mixed mode is adopted, the electric reactors and the capacitors are connected in series to be designed with traditional filtering branches in a mixed mode, the capacity requirement of series branches is effectively reduced, the filtering performance is improved, and meanwhile the cost is reduced. The package scheme is based on passive power elements, a protecting circuit is also based on self triggering, the reliability is high and the service life is long.

Description

technical field [0001] The invention relates to a filter device, in particular to a series-parallel hybrid passive power filter and protection device. Background technique [0002] The harmonics of the power system mainly come from nonlinear loads including rectification links such as frequency converters and intermediate frequency furnaces. With the wide application of these nonlinear loads, there are more and more harmonics in the power system, and the power quality is deteriorating day by day. Therefore, it is extremely urgent to filter the harmonics generated by these nonlinear loads. At present, there are two main schemes for filtering harmonics in power systems, one is traditional passive filtering (such as filtering with single-tuning, double-tuning and other filter circuits), and the other is using active filtering. The passive filter used in the traditional passive filtering solution has simple structure, mature technology and low investment cost, but the filtering...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 范丙军张社旗袁卫华
Owner 邯郸市恒山通用电气有限公司
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