CN2788434Y

CN2788434Y - Harmonious restrain and non-power on-spot compensating device

Info

Publication number: CN2788434Y
Application number: CN 200520095477
Authority: CN
Inventors: 刘守善; 顾毅; 王勇; 张愉; 徐寿松; 刘军付; 刘波
Original assignee: Wuhan Guide Electric Co Ltd
Current assignee: Wuhan Guide Electric Co Ltd
Priority date: 2005-03-11
Filing date: 2005-03-11
Publication date: 2006-06-14
Anticipated expiration: 2015-03-11

Abstract

The utility model relates to a harmonic suppressing and reactive power on-site compensating device, which is a device capable of suppressing harmonic waves and compensating reactive power on site, wherein a parallel compensation capacitor is connected into an electricity transmission electric network; a plurality of monotonic harmonic capacitors is triggered by a thyristor zero passage (TSC) or switched by a mechanical switch (MSC); a reactor is connected in series into a parallel capacitor bank to form a plurality of parallel capacitor branch circuits with reactors which are connected in series; a capacitor makes use of a self-healing capacitor to be combined into a motionless reactive power compensation (SVC). The utility model can avoid the amplification of harmonic waves, makes the compensation capacitor work normally, limits surge current during switching, eliminates or reduces the impact of the surge current to an electric network, has the functions of reactive compensation and harmonic suppression, and is favorable for a communication system to work normally. The utility model can just carry out the harmonic suppression according to requirements of users, and is used in starting and braking equipment with frequent reverse and forward rotation and fast running speed variation, such as, harbors, ships, loading and unloading apparatuses, material flow freight yards, etc.

Description

Harmonic repression and reactive power retrieve on the spot equipment

Technical field the utility model relates to a kind of energy and suppresses the humorous compensation equipment that carries out reactive power compensation on the spot that involves.

Background technology is along with the development of power electronic technology, harbour and other industry, the electronics inverter and the rectifying device capacity that use are increasing, quantity is also more and more, big capacity nonlinear-load equipment produces a large amount of higher harmonic currents and injects electrical network, cause the power supply grid wave distortion, increased generating, transmission of electricity, the supplementary load loss of power supply and power consumption equipment, reduced the quality of voltage, the transformer supplementary load loss are increased, communication and messaging device are produced interference, threaten communication equipment and personnel's safety, threatening the economical operation of harbour and other industrial power supply and power consumption equipment.Based on needs energy-saving and cost-reducing and the raising power factor, the measure that suppresses harmonic wave is found out in the harm of research and analysis harmonic wave, makes it to meet country's " utility network harmonic wave " standard, and is significant to the safety and the economical production at harbour.

Adopt the high-order harmonic filtering device and the capacitance reactive compensation technology has reached its maturity and in industry extensive uses such as metallurgy, chemical industry at the above high-voltage fence of 10kV both at home and abroad at present, but, promptly directly carry out the few of filtering and reactive power compensation in the rectification circuit AC side at step down side.Because this class harbour machinery electric equipment load of unloader is little with respect to iron and steel, coal etc., and handling facilities all ahead of the curve, away from high voltage substation, if in the rectifier transformer high-pressure side, after the equipment investment of 10kV side employing hv filtering device, the forward position low-voltage equipment can not improve harmonic wave, be very uneconomic, big and the equipment that influences of energy dissipation normally moves, so must have, the forward position harmonic wave suppresses and reactive power compensating apparatus.

Existing " MV series in-situ reactive power compensation device " (patent No. 95204838.8), it is used for low voltage electric network, close user load, adopts thyristor switched capacitor, is provided with filtering capacitor." a kind of parallel connection type harmonic synthesis restraining device " (patent No. 03241470), it comprises that the harmonic wave that former limit is connected in parallel between electrical network and the load, secondary links to each other with the output of inverter circuit suppresses transformer, and the voltage sampling shaping circuit, SPWM pulse generation circuit, drive circuit and the inverter circuit that connect successively, two voltage transformers of this voltage sampling shaping circuit are received respectively between the output that grid side and harmonic wave suppress the secondary of transformer and inverter circuit." a kind of harmonic synthesis restraining device " (patent No. 02278946), comprise that the harmonic wave that former limit is connected between electrical network and the load suppresses transformer, be connected in parallel on the LC single tuning filter circuit of load input terminal, and the current sampling shaping circuit that connects successively, stagnate loop control circuit, spwm pulse generation circuit, drive circuit and inverter circuit, two current transformers of this current sampling shaping circuit are received harmonic wave respectively and are suppressed on the former limit of transformer and between the output of secondary and inverter circuit.

The forward position reactive power compensation of present domestic harbour, and the problem that exists of harmonic wave, and solution;

1), repeat the reactive power compensation of short time duty load, can not in time respond, easily produce overcompensation and undercompensation, the overcompensation meeting causes bad power consumption equipment of network loss;

2), harmonic load was carried out reactive power compensation design not at that time, on the contrary harmonic wave was amplified, and maximum scalable 10 times, can cause electric network pollution, and damage capacitor.

The summary of the invention the purpose of this utility model is at above-mentioned present situation, aims to provide a kind ofly can suppress humorous involving and carry out reactive power compensation on the spot, the harmonic repression and reactive power retrieve on the spot equipment of security of operation.

The implementation of the utility model purpose is, harmonic repression and reactive power retrieve on the spot equipment, in the transmission of electricity electrical network, incorporate parallel capacitor group, single tuning filtering capacitor group, system loading into, parallel capacitor group or switch on-off, in the parallel capacitor group, series connection inserts reactor L, forms the parallel capacitor C branch road group of band series reactor, and single tuning filtering capacitor group is composed in series single tuning filtering capacitor group by switch, inductance L, filtering capacitor C group.

The utility model has following advantage:

1) adopt self-healing shunt capacitor, series reactor, make the reactive-load compensation capacitor loop under low secondary frequencies, present perception, can avoid the amplification of harmonic wave, make the compensation condenser can operate as normal, the surge current when restriction is switched;

2) quick switching triggers with silicon control zero-cross, and it is made up of capacitor, bidirectional triode thyristor or (inverse parallel controllable silicon) and little impedance current limiting reactor, and it mainly acts on surge current when being the restriction switching current limiting reactor, and elimination or minimizing are to the impact of electrical network;

3) design single tuned filter (LC filter) at 5,7,11, the inhibition of (or other) subharmonic administers, it is the filter that is formed by filtering capacitor, reactor and resistor combination, in parallel with harmonic source, except that strobing, also have certain inactive power compensation;

4) the design high pass filter suppresses the high order harmonic component more than 13 times, helps the communication system operate as normal.This equipment also can only carry out harmonic wave separately according to customer requirements to be suppressed.

Description of drawings

Fig. 1 suppresses and the power factor compensation schematic diagram for the utility model harmonic wave

Fig. 2 is the utility model Application Example electrical schematic diagram

Fig. 3 is the control loop figure of Fig. 2

Fig. 4 is the single tuning filtering control loop figure of Fig. 2

Embodiment is with reference to Fig. 1, and the utility model is made up of parallel capacitor group, single tuning filtering capacitor group, high pass filter, system loading etc.

Wherein the parallel capacitor group is by thyristor zero cross fired V1, V2 or mechanical switch switching, employing is in Shunt Capacitor Unit C, series connection inserts reactor L, the shunt capacitor branch road group of forming the band series reactor, the effect of series reactor is to make shunt capacitor can prevent that harmonic wave from amplifying and harmonic current flows into capacitor, and normally switching, capacitor damage to cause power factor controller.Capacitor adopts electrode evaporation technology (self-healing), is combined into static reacance power compensator (SVC) device.

Single tuning filtering capacitor group is by switch, inductance L 3, L5, L7, L11 etc., and filtering capacitor C3, C5, C7, C11 etc. are composed in series single tuning filtering capacitor group.

Switch on-off can adopt manually or automatic switching, and switching mainly strobes and guarantees and the compensation condenser operate as normal simultaneously first-harmonic played the fixed compensation effect.

The seventh harmonic often produces at the scene, is three groups so the utility model generally designs the inhibition group, also can the group number be set according to the on-the-spot test situation because three, five.

High pass filter can suppress the high order harmonic component more than 13 times, helps the communication system operate as normal.But because on-the-spot general harmonic wave more than 13 times is very little, so be not provided with, if test can be incorporated high pass filter into when exceeding standard in the transmission of electricity electrical network, high pass filter is made up of resistance R O, inductance L O, electric capacity string CO connection in series-parallel.

The utility model Application Example and electric major loop are seen Fig. 2,

1) bus and facility thereof are by U ₁.U ₂.U ₃.N.PL in the three-phase five-wire mode of Zu Chenging, be connected into the total air switch Q of bus ₁, be lightning arrester PE, also can take the circumstances into consideration not to be provided with not current transformer TA, it act as current sample, ammeter PA, and it act as the demonstration electric current, voltmeter PV, it act as the demonstration three-phase voltage, and power factor controlling COS Φ table as demonstration is arranged on the power factor controller, then shouldn't.Also have fuse FU, transformer in the circuit, power of transformer is the 220V power supply.Bus also can be made as three-phase four-wire system;

2) integrated package RVC6 is a power factor controller, the exit point tap auxiliary relay J of integrated package RVC6 ₁～J ₆

3) the power model A noncontacting switch that two inverse parallel controllable silicons are formed of serving as reasons, power model A organizes a termination fuse FU8-FU23, a termination reactor L1-L6, C1～C6.Power model A is used for zero cross fired, and C1～C6 adopts self-healing shunt capacitor, C1～C6 and reactor, make the reactive-load compensation capacitor loop present perception frequently at low order, can avoid the amplification of harmonic wave, make compensation condenser energy operate as normal, the surge current when restriction is switched;

4) A.C. contactor P1KM1, the P1KM2 of filtering capacitor group meet fuse FU24-FU29, reactor L, capacitor C H5, CH7.The effect of filtering capacitor group be to five, the seventh harmonic suppresses;

5) silicon control zero-cross among Fig. 3 triggers power model by direct current 5V DC power supply, constitutes control loop, by power factor controller RVC6 sampling, carries out analog-to-digital conversion therein, and the monolithic automatic analysis is according to what idle in load automatic switchings.

Single tuning filtering control loop is seen figure four, and the P1KM1 in the control loop, P1KM2 are ac contactor coil or contact, and K2SB1, K2SB3 are for often driving button, and K2SB2, K2HL1 are normally closed button, and K2HL1, K2HL2 are indicator light.

Claims

1, harmonic repression and reactive power retrieve on the spot equipment, it is characterized in that in the transmission of electricity electrical network, incorporating parallel capacitor group, single tuning filtering capacitor group, system loading into, the parallel capacitor group is thyristor zero cross fired V1 or switch on-off, in the parallel capacitor group, series connection inserts reactor L, the parallel capacitor C branch road group of forming the band series reactor, single tuning filtering capacitor group is composed in series single tuning filtering capacitor group by switch, inductance L, filtering capacitor C group.

2, harmonic repression and reactive power retrieve on the spot equipment according to claim 1 is characterized in that incorporating high pass filter in the transmission of electricity electrical network, and high pass filter is made up of resistance R O, inductance L O, electric capacity string CO connection in series-parallel.