CN209267187U

CN209267187U - Low pressure dynamic zero transition reactive power compensator

Info

Publication number: CN209267187U
Application number: CN201920196726.5U
Authority: CN
Inventors: 梁效杰; 邰元静
Original assignee: Jiangsu Manweide Electric Co Ltd
Current assignee: Jiangsu Manweide Electric Co Ltd
Priority date: 2019-02-14
Filing date: 2019-02-14
Publication date: 2019-08-16
Anticipated expiration: 2029-02-14

Abstract

The utility model relates to a kind of low pressure dynamic zero transition reactive power compensators, including zero transition reactive controller, current transformer, breaker of plastic casing, thuristor throw-in and throw-off switch, power capacitor and current-limiting reactor；The zero transition reactive controller is connect by several current transformers with bus, for acquiring bus current and system voltage；The thuristor throw-in and throw-off switch is connect by breaker of plastic casing with zero transition reactive controller, and thuristor throw-in and throw-off switch receives the signal that zero transition reactive controller issues, and is put into the moment of voltage waveform and current waveform whole zero crossing；The power capacitor is connected by current-limiting reactor and thuristor throw-in and throw-off switch, generates reactive power.The low pressure dynamic zero transition reactive power compensator, without impact, does not generate harmonic wave and throw in-of oscillation, power supply reliability and the service life for power device can be improved to power grid.

Description

Low pressure dynamic zero transition reactive power compensator

Technical field

The utility model relates to reactive power compensation technology fields more particularly to a kind of low pressure dynamic zero transition reactive compensation to fill It sets.

Background technique

The existing reactive power compensation technology in market mostly uses greatly switch-capacitor contactor or combination switch traditional approach, wherein cutting It changes capacitor switching contactor and belongs to electric mechanical switch switched capacitor group, combination switch belongs to electronic switch and electric mechanical switch complex method is thrown Cut capacitor group；Current enterprise's produce load power requirement is had the following deficiencies:

(1) equipment work can amplify load harmonic, easily cause capacitor and Cascade System, parallel resonance, cause capacitor Device overcurrent or overvoltage cause total lock to trip；

(2) electric mechanical switch type, for the impact load of quick frequent fluctuation, not can guarantee nothing when putting into capacitor The demand of function power, when load needs capacitor to provide idle, electric mechanical switch needs to establish magnetic field due to self character to promote It is closed mechanical contact, this process needs 60S or longer time, in the process of this energy conversion, loads the idle of generation Power is unable to effective compensation；

(3) controller is after issuing switching instruction, and contactor is due to own characteristic, during frequent switching capacitor, Often cause more serious electric current to shove and switching overvoltage phenomenon, seriously affect the normal use of device itself；

(4) working time cannot stablize generates arcing in constant curve, the course of work, is easy to make to connect after continuous action Contact aging, is burnt at adhesion, it is easy to cause overcompensation, being that system voltage is excessively high causes to seriously endanger.

Utility model content

The purpose of the utility model is to provide a kind of low pressure dynamic zero transition reactive power compensators, according to system reactive power The demand of compensation determines capacitor switching series, triggers semiconductor switch device with zero transition procedue condition, so that dynamic is controlled Capacitor group switching processed.

The utility model is achieved by the following technical solution: a kind of low pressure dynamic zero transition reactive power compensator, packet Include zero transition reactive controller, current transformer, breaker of plastic casing, thuristor throw-in and throw-off switch, power capacitor and series reactance Device；

The zero transition reactive controller is connect by several current transformers with bus, for acquiring bus current and being System voltage；

The thuristor throw-in and throw-off switch is connect by breaker of plastic casing with zero transition reactive controller, thuristor throw-in and throw-off switch The signal for receiving the sending of zero transition reactive controller is put into the moment of voltage waveform and current waveform whole zero crossing；

The power capacitor is connected by current-limiting reactor and thuristor throw-in and throw-off switch, generates reactive power.

The low pressure dynamic zero transition reactive power compensator of the utility model is to control thuristor throw-in and throw-off tune using microprocessor The full-automatic dynamic harmonic elimination reactive power compensation device of humorous capacitance group, is the renewal product of reactive-load compensation equipment.Such product is adopted With microprocessor reactive power real-time monitoring thyristor zero transition procedue quick-switching, the advanced technologies such as current harmonics elimination are fitted Conjunction is applied in the industrial environment of various complexity, can it is accurate, quickly, the dynamic passive compensation that disturbs of non-transient, effectively The power factor of various electrical equipments is improved, power equipment power output is improved, improving power quality reduces line loss, realizes energy-saving Purpose.When switched capacitor group, make capacitor group to the dynamic current of place grid connection point and the aperiodic component of voltage Close to zero.Current-limiting reactor inhibits five times and subharmonic more than five times.Using microprocessor as control unit, with semiconductor switch Device is main executive component, by one or more capacitor coded combinations, by transporting to network voltage, electric current and capacitor group Row operating condition is measured in real time and relevant calculation, determines capacitor switching series according to the demand that system reactive power compensates, Semiconductor switch device is triggered with zero transition procedue condition, thus dynamic control capacitor group switching.

In order to guarantee safety, fuse is provided with before the thuristor throw-in and throw-off switch.

Preferably, the power capacitor is parallel power capacitor.The power capacitor includes that two-way point is mended If capacitor is mended on capacitor and main line altogether.

The beneficial effect of the low pressure dynamic zero transition reactive power compensator of the utility model is:

1, reliable performance: the electromagnetic energy conservation of energy (zero transition procedue) in the electric field energy and power grid of capacitor is selected Time trigger thyristor connects corresponding capacitor group to power grid without impact and does not generate harmonic wave and throw in-of oscillation, can be improved Power supply reliability and service life for power device；

2, dynamic is quick: automatic quick, dynamic passive compensation, compensation response time are 15ms or so, can inhibit voltage Big ups and downs, voltage fluctuation < 6%；

3, compatibility is strong: reactive compensation and voltage adjustment develop simultaneously, and compensation capacity is arbitrarily adjustable, can be with distribution automation device Interface, and double as quality of voltage monitoring arrangement.

Detailed description of the invention

Fig. 1 is the circuit diagram of the low pressure dynamic zero transition reactive power compensator of the utility model；

Fig. 2 is the schematic diagram of the current loop of the utility model；

Fig. 3 is the schematic diagram of the voltage circuit of the utility model.

Specific embodiment

The preferred embodiment of the utility model is described in detail with reference to the accompanying drawing, so that the advantages of the utility model It can be easier to be understood by those skilled in the art with feature, to make apparent specific boundary to the protection scope of the utility model It is fixed.

As shown in Figure 1, a kind of low pressure dynamic zero transition reactive power compensator, including zero transition reactive controller Q, electric current are mutual Sensor CTa, CTb, CTc, breaker of plastic casing QF, thuristor throw-in and throw-off switch MK1-5, parallel power capacitor C1-C5 and series connection Reactor MDK1-MDK5.The zero transition reactive controller uses zero transition reactive controller MWT-R1, passes through current transformer CTa, CTb, CTc and bus connect, for acquiring bus current and system voltage；The thuristor throw-in and throw-off switch MK1-5 passes through Breaker of plastic casing QF is connect with zero transition reactive controller Q, and fuse FU1-5 is provided with before thuristor throw-in and throw-off switch MK1-5, brilliant Brake tube fling-cut switch MK1-5 receives the signal that zero transition reactive controller Q is issued, in voltage waveform and current waveform whole zero passage The moment investment of point；The power capacitor C1-C5 is switched by 7% current-limiting reactor MDK1-MDK5 and thuristor throw-in and throw-off MK1-5 connection, generates reactive power, and power capacitor includes that 2 roads point are mended C1, C2 and mended altogether into C3, C4, C5.

Preferably, capacitor C1-C5 minimum, which is cut, threw interval time no more than 0.03 second；Protection act cuts off capacitor The C1-C5 time is not more than 0.04 second；Capacitor C1-C5 group puts into the peak value≤1.3 times capacitor C1-C5 group rated current width that shoves Value；Thuristor throw-in and throw-off switch MK1-5 conducting maximum voltage (containing commutation)≤1.6 volts；Capacitor C1-C5 does not need to discharge, can be with It realizes really real-time, dynamic, automatic switching, guarantees that instantaneous power factor is not less than 0.95.

The current loop of the utility model as shown in Figure 2, current transformer TAa, TAb, TAc show table with electric current respectively PA1-3 connection.

The voltage circuit of the utility model as shown in Figure 3, fuse RD1-3 are shown by change-over switch SA1 and voltage Table PV connection.

The power of power grid output includes two parts: first is that active power: electric energy is changed into machinery by directly consumption electric energy Energy, thermal energy, chemical energy or sound energy, can be done work using these, this Partial Power is known as active power；Second is that reactive power: not disappearing Consuming electric power, only convert electrical energy into it is another form of can, it is this can the necessary condition that can do work as electrical equipment, and And this can be periodically switched in power grid with electric energy, this Partial Power is known as reactive power, and (such as electromagnetic component is established The electric energy that magnetic field occupies, capacitor establish electric energy shared by electric field).

The specific implementation of the utility model reactive compensation is as follows: device and perceptual function with capacitive power load Rate load is simultaneously connected in same circuit, and energy is exchanged with each other between two kinds of loads.In this way, idle function required for inductive load The reactive power compensation that rate can be exported by capacitive load；When power factor is lower than target value, zero transition reactive controller Q passes through Current Transmit a, CTb, CTc acquisition bus current and A B C system voltage in incoming line cabinet, through the idle control of zero passage transition The Fourier decomposition operation of device Q provides the reactive power size of load needs.It exports and believes using zero transition reactive controller Q Number, zero transitional level signal is issued, signal is given to thuristor throw-in and throw-off switch MK1-5 triggering command, and fling-cut switch receives triggering It after investment order, is put into the moment of voltage waveform and current waveform whole zero crossing, will not cause to shove and electric arc.Put into it Afterwards, power capacitor C1-C5 passes through current-limiting reactor MDK1-5, and thuristor throw-in and throw-off switch MK1-5 puts into power grid, generates idle Power, reactive power needed for perceptual power load can absorb in zero transition reactive power compensator.Compensate the function in power grid Rate factor not only meets requirement of the power supply company to power factor, while the raising to power quality, makes to electrical equipment With the service life, there is comprehensive promotion.

Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed, But it cannot be understood as the limitations to utility model patent range.It should be pointed out that for the common skill of this field For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to The protection scope of the utility model.

Claims

1. a kind of low pressure dynamic zero transition reactive power compensator, it is characterised in that: including zero transition reactive controller, Current Mutual Inductance Device, breaker of plastic casing, thuristor throw-in and throw-off switch, power capacitor and current-limiting reactor；

The zero transition reactive controller is connect by several current transformers with bus, for acquiring bus current and system electricity Pressure；

The thuristor throw-in and throw-off switch is connect by breaker of plastic casing with zero transition reactive controller, and thuristor throw-in and throw-off switch receives The signal that zero transition reactive controller issues is put into the moment of voltage waveform and current waveform whole zero crossing；

2. low pressure dynamic zero transition reactive power compensator according to claim 1, it is characterised in that: the thuristor throw-in and throw-off Fuse is provided with before switch.

3. low pressure dynamic zero transition reactive power compensator according to claim 1, it is characterised in that: the power capacitor For parallel power capacitor.

4. low pressure dynamic zero transition reactive power compensator according to claim 1, it is characterised in that: the power capacitor If mending capacitor altogether including two-way point benefit capacitor and main line.

5. low pressure dynamic zero transition reactive power compensator according to claim 4, it is characterised in that: each capacitor Put into the nominal current magnitude for the peak value≤1.3 times capacitor that shoves.

6. low pressure dynamic zero transition reactive power compensator according to claim 1, it is characterised in that: the current transformer Show that table is connect with electric current.