CN202395448U

CN202395448U - Comprehensive electricity quality treatment device

Info

Publication number: CN202395448U
Application number: CN2011204805552U
Authority: CN
Inventors: 杨露; 王磊; 严刚
Original assignee: GUANGXI XINGYU INTELLIGENT ELECTRIC CO Ltd
Current assignee: GUANGXI XINGYU INTELLIGENT ELECTRIC CO Ltd
Priority date: 2011-11-28
Filing date: 2011-11-28
Publication date: 2012-08-22
Anticipated expiration: 2021-11-28

Abstract

A comprehensive electricity quality treatment device consists of a load side current measurement sensor, a moulded case circuit breaker, a voltage measurement sensor, a filter assembly, an inrush current contactor, an inrush current resistor, a main contactor, a device side current measurement sensor, an internal reactor, a current transformer module, a high pressure energy storage module and an intelligent controller. The electricity quality information of compensated equipment is detected by a sensor arranged at the compensated equipment and sent to the controller of the comprehensive electricity quality treatment device, the collected electricity quality information is analyzed by the controller, and the controller outputs a signal, which is same in amplitude but reverse in direction relative to compensated quantity, in real time, so as to achieve the comprehensive electricity quality treatment purposes of filtering harmonic wave, compensating reactive power, balancing load and the like.

Description

A kind of power quality harnessed synthetically device

Technical field

The utility model relates to the electric-power filter technical field, is specifically related to a kind of power quality harnessed synthetically device.

Background technology

In low-voltage network, the characteristic of load current directly affects the quality of supply power voltage, and power quality problem is divided into quality of voltage problem and two aspects of electric current quality problems.Wherein the quality of voltage problem is meant voltage fluctuation and problems such as flickering, voltage harmonic, voltage three-phase imbalance, voltage falling and voltage interruption.The electric current quality problems then are meant the current distortion that nonlinear-loads such as power electronic equipment bring to electrical network; A large amount of reactive currents that the motor device that some efficient are lower is introduced; The unsymmetrical current (negative-sequence current and zero-sequence current) that single-phase load is introduced, the flicker that the low frequency load variations causes etc.Quality of voltage and electric current quality are to be closely related and interactive, and for example, thereby the harmonic current system of flowing through that nonlinear-load causes can cause voltage distortion to influence the whole network user in various degree.

Along with the extensive use of RHVC and controllable silicon equipment, the harmonic pollution problem of electrical network also becomes increasingly conspicuous, and harmonic wave is also increasing the influence of electromechanical equipment reliability service and energy consumption gradually.Not only quickened the system electrical ageing equipment, caused relaying protection and automatics misoperation, even cause equipment burnout, so the harmonic pollution in electric power net purifying problem becomes very urgent.

At present, for the improvement of power quality problem, mainly contain two types of passive filter and active filters.Wherein, passive filter has comprised LC passive filter, saturable reactor etc., and it has following deficiency: its compensation characteristic depends on electrical network and load parameter, and these parameters are often to change; LCR (inductance, electric capacity, the resistance) drift of parameter can cause the change of filtering characteristic; Series parallel resonance between electrical network and filter possibly take place, and causes harmonic wave to amplify.Passive filter is used has suitable limitation.Therefore, the active filter development of being born at the end of the seventies in last century is rapid, and the progress of Along with computer technology and power electronic technology constantly moves towards perfect.

Active Power Filter-APF utilizes state-of-the-art information technology and power electronic technology to realize the filtering to harmonic wave excellently.It is separated out the idle, humorous of load current through high-speed sampling and Intelligent Measurement technical point and involves uneven degree, and inversion transformation technique output offset current is realized continuously, dynamic no-power compensation function thereby utilize.Active Power Filter-APF is equivalent to a special power supply, specially only exports idle, harmonic wave, uneven composition at it, and can be according to the different outputs of adjustment automatically of load.

The utility model content

The purpose of the utility model is a kind of power quality harnessed synthetically device, belongs to a kind of of active power filter, and it can effectively solve topmost three problems of the quality of power supply in power distribution network: harmonic content is high; Power factor is low; Three-phase load is uneven.

In order to address the above problem; The utility model adopts following technical scheme to realize: a kind of power quality harnessed synthetically device is made up of current metering sensor, breaker of plastic casing, voltage measurement transducer, filter assembly, the contactor that shoves, the resistance that shoves, main contactor, inner reactor, converter module, high-voltage energy storage module and intelligent controller; Its major loop is breaker of plastic casing, filter assembly, the contactor that shoves, the resistance that shoves, main contactor, inner reactor, converter module and high-voltage energy storage module are formed by connecting with cable successively; The voltage measurement transducer is connected with intelligent controller with the current metering sensor output signal line, and intelligent controller connects shove contactor, main contactor and converter module through holding wire.

Said inner reactor is core reactor in midair, and the inductance value value is being significantly improved aspect heat radiation and the noise at 0.1～0.8mH.

Said device operation principle is following: one or more voltage, current sample module are arranged; Collection is by the quality of power supply information of compensation equipment; The intelligent controller that these signals of being gathered are sent into said device carries out analytical calculation, outputs a control signal to converter module, control high-power switch tube work wherein; Producing the electric current with the amount constant amplitude direction that needs compensation, thereby reach the purpose of power quality harnessed synthetically.In the device course of work, by the real-time filtering device of filter assembly can't filtering some small high-frequency harmonic components, to reach perfect regulation effect.

Device has defencive functions such as overcurrent, overvoltage, excess temperature, under-voltage, underloading, is taking place when unusual, can the automatic disconnecting device major loop, and quit work, and see alarm signal off.

The said device hardware designs of the utility model is based on that at a high speed signal processing technology and advanced power electronic technology realize.

Detecting signal unit adopts the Hall current instrument transformer best to harmonic current conversion of signals effect.

Intelligent controller uses two high-speed digital signal processors, constitutes Distributed Calculation, has significantly improved the real-time response time of device.

The utlity model has following advantage:

1, intelligent filtering harmonic at filtering 2～25 subharmonic simultaneously, does not produce new high order harmonic component;

2, continuous dynamic passive compensation, compensation capacity is accurate, " stepless " control;

3, balanced three-phase load is eliminated current in middle wire.

Description of drawings

Fig. 1 is the operation principle sketch map of the said power quality harnessed synthetically device of the utility model.

Fig. 2 is the hardware capability module frame chart of the said power quality harnessed synthetically device of the utility model.

Embodiment

Below in conjunction with accompanying drawing and instance described power quality harnessed synthetically device of the utility model and operation principle thereof are described further.

Shown in accompanying drawing 1, it has simply described the operation principle of device.The Current Decomposition by compensation equipment that said device will collect becomes the first-harmonic harmonic; By said device output and by the reverse harmonic current of compensation equipment constant amplitude; Remove to offset harmonic current by compensation equipment; Thereby make its electric current that flows into system side have only fundamental current, finally realize the purpose of power quality harnessed synthetically.

Shown in accompanying drawing 2; The described power quality harnessed synthetically device of the utility model, main devices comprises: load-side current metering sensor 1, breaker of plastic casing 2, voltage measurement transducer 3, filter assembly 4, the contactor 5 that shoves, the resistance 6 that shoves, main contactor 7, device side current metering sensor 8, inner reactor 9, converter module 10, high-voltage energy storage module 11 and intelligent controller 12.

The course of work of said device is following:

Said device before start, first closed breaker of plastic casing 2.After receiving start-up command, control contactor 5 closures of shoving by intelligent controller 12, at this moment; Electric current is through shoving resistance 6, inner reactor 9, converter module 10; Give 11 precharge of high-voltage energy storage module, treat its voltage reach set require after, intelligent controller 12 sends instruction; Closed main contactor 7 breaks off the contactor 5 that shoves.At this moment, the start work of phase I is accomplished, with the normal workflow of beginning second stage.

During the operate as normal of second stage; Intelligent controller 12 is at first gathered current by the quality of power supply information of compensation arrangement through load-side current metering sensor 1 and voltage measurement transducer 3; Convert digital signal to and be input to intelligent controller 12; Through the inner self adaptation electric energy mass compensation algorithm of intelligent controller 12, draw converter module 10 control signal, output to converter module 10 by intelligent controller 12.Converter module 10 is according to control signal, and through ceaselessly open and close operation, control high-voltage energy storage module 11 is output or absorption current externally, and consequent electric current is injected into system through inner reactor 9, thereby reaches the effect of power quality harnessed synthetically.

Claims

1. power quality harnessed synthetically device, it is characterized in that: this device is made up of current metering sensor, breaker of plastic casing, voltage measurement transducer, filter assembly, the contactor that shoves, the resistance that shoves, main contactor, inner reactor, converter module, high-voltage energy storage module and intelligent controller; Its major loop is breaker of plastic casing, filter assembly, the contactor that shoves, the resistance that shoves, main contactor, inner reactor, converter module and high-voltage energy storage module are formed by connecting with cable successively; The voltage measurement transducer is connected with intelligent controller with the current metering sensor output signal line, and intelligent controller connects shove contactor, main contactor and converter module through holding wire.

2. power quality harnessed synthetically device as claimed in claim 1 is characterized in that: said inner reactor is core reactor in midair, and the inductance value value is at 0.1～0.8mH.