CN202856368U

CN202856368U - Reactive compensation filter

Info

Publication number: CN202856368U
Application number: CN2012204243687U
Authority: CN
Inventors: 陈克清
Original assignee: XIAMEN AIRUISHENG ELECTRIC TECHNOLOGY CO LTD
Current assignee: Fujian Aurora Development Co., Ltd.
Priority date: 2012-08-26
Filing date: 2012-08-26
Publication date: 2013-04-03
Anticipated expiration: 2022-08-26

Abstract

Disclosed is a reactive compensation filter, comprising a phase control switch, a phase control switch controller, a sensor, a capacitor, a passive filter, and an active filter. The reactive compensation filter is characterized in that one end of the phase control switch is connected with the capacitor, with the other end of the phase control switch being connected with the electrical network; the electrical network is also parallelly connected with the passive filter and the active filter; and the input of the phase control switch controller is connected with the voltage and current signals of the electrical network as well as the environmental temperature signals and control voltage monitoring signals while the output of the phase control switch controller is respectively connected with the phase control switch and a compensation current control circuit of the active filter. The reactive compensation filter of the utility model is reconstructed and upgraded on the basis of the conventional parallelly connected hybrid active filter with the reactive compensation function. The reactive compensation filter of the utility model adopts the phase control switch technology to realize the non-impact casting and cutting of the reactive power compensator, and eliminates the influence of the surge and the overvoltage upon the reactive power compensator and active filter, thereby realizing the objectives of inhibiting the harmonic wave in the power supply current, making the active filter carry out switching at the optimum target phase, and ensuring the normal operation of other electrical and electronic devices.

Description

The reactive power compensation filter

Technical field

The utility model belongs to electrical engineering and field of mechanical technique, relates to a kind of reactive power compensation filter.

Background technology

Tradition is the switching of realizing the capacitor group by control A.C. contactor or air switch with its reactive power compensator of Shunt Hybrid Active Power Filter of no-power compensation function.The shortcoming of this device is can produce in the opening-closing capacitor bank process to shove and overvoltage, this shoving can affect the work of other power electronic equipments in active filter and the system with overvoltage, also can cause the damage of active filter and other power electronic equipments when serious, in the high voltage field, shove more outstanding with superpotential harm.In addition, tradition, is difficult to realize the optimization operation of reactive power compensation, and benefit often occured owing to the reason of equipment or the limitation of user's level with the Shunt Hybrid Active Power Filter of no-power compensation function, to electrical network foldback reactive power, cause the quality of voltage problem when especially voltage is higher after zero point.

Summary of the invention

The technical problems to be solved in the utility model is to propose a kind of reactive power compensation filter, upgrading on the basis of existing Shunt Hybrid Active Power Filter with no-power compensation function, adopt throwing, cut without impacting of phase controlled switch technique realization reactive power compensator, eliminate and shove and the impact of overvoltage on reactive power compensator and active filter.

The technical solution of the utility model is as follows:

The reactive power compensation filter comprises phased switch, phased switch controller, transducer, capacitor, passive filter and active filter.Phased switch one end links to each other with capacitor, and the other end is connected into electrical network.Also be parallel with passive filter and active filter on the electrical network simultaneously.Voltage and current signal, ambient temperature signal and the control voltage monitoring signal of phased switch controller input system of connections electrical network, output connects respectively the offset current control circuit of phased switch and active filter.

Effect of the present utility model and benefit are to introduce advanced phase controlled switch technique, finish the input of switching and the active filter offset current of phased switch in optimum phase, the harmonic pollution that shoves and cause that elimination produces in the switch on-off process, and cause the problem of the work of over-voltage protection active filter.

Description of drawings

Fig. 1, principle schematic of the present utility model.

Among the figure, es represents the AC power electromotive force, and is is the AC power electric current, and iL is load current.Ic is offset current, and ic* is the command signal of offset current, and APF is Active Power Filter-APF.

Embodiment

Be described in detail specific embodiment of the utility model below in conjunction with technical scheme and accompanying drawing.

Principle schematic with reference to the accompanying drawings, the reactive power compensation filter is comprised of capacitor, passive filter and active filter.Capacitor is used for the required reactive power of bucking-out system.Passive filter is responsible for the high-frequency harmonic current segment of bucking-out system.The low-frequency harmonics current segment is compensated by active filter APF.The voltage and current of the real-time detection of grid of active filter APF, calculate the command signal of offset current through the instruction current computing, this signal amplifies through the offset current circuit for generating, draw offset current, the harmonic current that will compensate in offset current and the load current is offset, and finally obtains the source current of expecting.For example, when the harmonic current that needs compensating load to produce, Active Power Filter-APF detects the harmonic component iLh of target compensation load current iL, with its command signal ic* of electric current by way of compensation, the offset current ic that is produced by the offset current circuit for generating namely with load current in harmonic component iLh equal and opposite in direction, that is to say, AC power current i s power supply only provides fundamental current to load, and harmonic current is provided by the offset current circuit for generating of Active Power Filter-APF.Thereby so that only contain first-harmonic among the AC power current i s, do not contain harmonic wave.So just reached the purpose that suppresses harmonic wave in the source current.

The current and voltage signals of phased switch controller Real-Time Monitoring electrical network, ambient temperature signal and control voltage monitoring signal, draw the optimum target phase place through after the calculating of controller, then export the offset current control circuit that control signal connects respectively phased switch and active filter, make phased switch carry out capacitor switching in the optimum target phase place, finish idle dynamic compensation, the elimination system shoves and overvoltage; Make active filter at optimum target phase place switching, avoid system shove and over-voltage protection active filter and system in the normal operation of other power electronic equipments.

Claims

1. reactive power compensation filter, comprise phased switch, phased switch controller, transducer, capacitor, passive filter and active filter, it is characterized in that: phased switch one end links to each other with capacitor, the other end is connected into electrical network, also be parallel with passive filter and active filter on the electrical network, voltage and current signal, ambient temperature signal and the control voltage monitoring signal of phased switch controller input system of connections electrical network, output connects respectively the offset current control circuit of phased switch and active filter.