CN201388061Y

CN201388061Y - High-voltage-to-low-voltage reactive power compensation flexible switching device

Info

Publication number: CN201388061Y
Application number: CN200920151714U
Authority: CN
Inventors: 席鸿儒
Original assignee: BEIJING SENSHUO ELECTRIC EQUIPMENT Co Ltd
Current assignee: BEIJING SENSHUO ELECTRIC EQUIPMENT Co Ltd
Priority date: 2009-04-21
Filing date: 2009-04-21
Publication date: 2010-01-20
Anticipated expiration: 2019-04-21

Abstract

The utility model provides a high-voltage-to-low-voltage reactive power compensation flexible switching device. A high-voltage bus, a first circuit breaker, a step-down transformer and a low-voltage bus are connected in sequence; a second circuit breaker is connected with one end of a contact point of a contactor, the anode of a diode, and the cathode of a thyristor; the other end of the contact point of the contactor, the cathode of the diode and the anode of the thyristor are connected with a reactor; the reactor is connected with a grounding net after being connected with a capacitor; and a flexible switching controller is respectively connected with the coil of a thyristor contactor, an auxiliary contact, and the output terminal of a wattless controller. The utility model has the advantages that the flexible switching circuit and the contactor are matched for switching, thereby resulting in high response speed and low cost and loss, and approximately realizing stepless regulation; the thyristor flexible switching and the contactor are matched, thereby realizing zero current switching, inrush current elimination, frequent switching and the prolonged service life of the capacitor, enabling the thyristor to be electrified in a short period of time, reducing the loss of the thyristor, and eliminating influence on the service life of the contactor.

Description

The flexible switching device of a kind of high voltage variable low-pressure reactive compensation

Technical field

The utility model relates to a kind of power system reactive power compensation device, the flexible switching device of particularly a kind of high voltage variable low-pressure reactive compensation.

Background technology

Increase day by day along with the high-pressure reactive compensation demand, many reactive power compensation industries all seeking a kind of more reasonable, more effective reactive-load compensation method, go gradually into various reactive power compensation modes, every kind of mode cuts both ways, the SVC of TCR type for example, it is made up of two parts, be respectively FC (fixed capacitor) and TCR (thyristor-controlled reactor), independent TCR can only send lagging reactive power, independent FC can only send capacitive reactive power, after two parts are used, the reactive power of the output that SVC is total is the clean reactive power after two kinds of reactive powers are offset, because the TCR response speed is very fast, so the SVC corresponding speed that is combined by FC and TCR is also very fast, but cost is too high, floor space is big, it is difficult to safeguard, loss is too big, self produces harmonic wave; The compensation arrangement of pressure-adjusting type mainly is made up of voltage regulator and capacitor group two parts, the effect of voltage regulator is exactly a regulating system voltage, export to capacitor then, and changing its terminal voltage by voltage regulator, the idle variation of exerting oneself of capacitor group realizes, this compensation way cost is low, loss is little, but level is regulated in order to have, response speed is slow, can't be applicable to the very fast industry of load variations, transformer station; The capacitor tuning type compensation is exactly grouping switching capacitor group in fact, and capacitor is divided into some groups, and every group by a circuit breaker control, changing the idle of capacitor by switching circuit breaker exerts oneself, this compensation way corresponding speed is slower, and maintenance workload is big, and is bigger to electrical network, the impact of capacitor own.

The utility model content

Technical problem to be solved in the utility model is, at above-mentioned prior art present situation, and provide that a kind of response speed is fast, cost is low, loss is little, near the flexible switching device of the high voltage variable low-pressure reactive compensation of step-less adjustment.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: the flexible switching device of a kind of high voltage variable low-pressure reactive compensation comprises high voltage bus, first circuit breaker, step-down transformer, low-voltage bus bar; The described first circuit breaker end of incoming cables is connected on the described high voltage bus, and the leading-out terminal of first circuit breaker is connected on the end of incoming cables of described step-down transformer, and the leading-out terminal of step-down transformer is connected on the described low-voltage bus bar; It is characterized in that: comprise that also its end of incoming cables is connected second circuit breaker, contactor, diode, thyristor, reactor, the capacitor on the low-voltage bus bar; The leading-out terminal of described second circuit breaker is connected to an end of contacts of contactor, the anode of diode, the negative electrode of thyristor, the anode of the other end of contacts of contactor, the negative electrode of diode, thyristor links together with the end of incoming cables of reactor respectively, the leading-out terminal of reactor and the end of incoming cables of capacitor link together, and the leading-out terminal of capacitor is received ground network; The negative electrode of thyristor, anode, gate pole are connected with flexible switching controller respectively, and the coil of contactor, auxiliary contact are connected respectively on the flexible switching controller, and the control end of flexible switching controller is connected to the output of reactive controller.

The compensation branch road of being made up of in the manner described above second circuit breaker, contactor, diode, thyristor, reactor, capacitor, flexible switching controller can have the N group, they all are connected on the low-voltage bus bar, and the output of reactive controller is connected with the control end of the flexible switching controller of each group compensation branch road.

The diode in the such scheme and the negative electrode of thyristor, anode direction can be changed simultaneously, but must be simultaneously.For three-phase system, the leading-out terminal of capacitor is received the capacitor leading-out terminal of another phase.

Compared with prior art, advantage of the present utility model is that it combines the advantage and the method for SVC reactive power compensation and pressure regulating and capacitance regulating reactive power compensation, allows flexible switching circuit cooperate switching with contactor.Both response speed was fast, and cost is low again, loss is little; Capacitor just can be divided into tens groups behind the high voltage variable low-voltage compensation, even more, near step-less adjustment, can be applied in the express field of load variations fully; The flexible switching of thyristor cooperates with contactor, can realize the zero current switching, no-flashy-flow, can carry out frequent switching, increased capacitor useful life greatly, can also make the thyristor short time charged, reduced the loss of thyristor, do not influenced useful life of contactor.

Description of drawings

Fig. 1 is an electrical block diagram of the present utility model.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As shown in Figure 1, the flexible switching device of a kind of high voltage variable low-pressure reactive compensation comprises high voltage bus 1, first circuit breaker 2, step-down transformer 3, low-voltage bus bar 4; Described first circuit breaker 2 ends of incoming cables are connected on the described high voltage bus 1, and the leading-out terminal of first circuit breaker 2 is connected on the end of incoming cables of described step-down transformer 3, and the leading-out terminal of step-down transformer 3 is connected on the described low-voltage bus bar 4; Comprise that also its end of incoming cables is connected second circuit breaker 5, contactor 6, diode 7, thyristor 8, reactor 9, the capacitor 10 on the low-voltage bus bar 4; The leading-out terminal of described second circuit breaker 5 is connected to an end of contactor 6 contacts, the anode of diode 7, the negative electrode of thyristor 8, the anode of the other end of contactor 6 contacts, the negative electrode of diode 7, thyristor 8 links together with the end of incoming cables of reactor 9 respectively, the end of incoming cables of the leading-out terminal of reactor 9 and capacitor 10 links together, for single phase system, the leading-out terminal of capacitor 10 is received ground network; The negative electrode of thyristor 8, anode, gate pole are connected with flexible switching controller 11 respectively, and the coil of contactor 6, auxiliary contact are connected respectively to flexible switching controller 11, and the control end of flexible switching controller 11 is connected to the output of reactive controller 12.

The compensation branch road of being made up of in the manner described above second circuit breaker 5, contactor 6, diode 7, thyristor 8, reactor 9, capacitor 10, flexible switching controller 11 can have the N group, they all are connected on the low-voltage bus bar 4, and the output of reactive controller 12 is connected with the control end of the flexible switching controller 11 of each group compensation branch road.

Diode 7 in the such scheme and the negative electrode of thyristor 8, anode direction can be changed simultaneously, but must be simultaneously.

For three-phase system, the leading-out terminal of capacitor 10 is received the capacitor leading-out terminal of another phase.

Operation principle of the present utility model is as follows:

When system moves, the circuit breaker 5 of each group compensation branch road all is closed, this time, system was charged to crest voltage rapidly for capacitor by diode 7, this time, system did not have idle output, when there is reactive requirement in system, reactive controller 12 will calculate the reactive requirement amount, judgement should be thrown several groups of compensation branch roads, sends instructions then to flexible switching controller 11, and flexible switching controller 11 detects the voltage difference of thyristor 8 negative electrodes and anode, when pressure reduction lies prostrate near zero, illustrative system voltage also is in peak value, because the characteristic of capacitor is when being voltage peak, electric current is zero, export triggering signal constantly at this so and give thyristor 8 gate poles, then realized the zero current input, no-flashy-flow has dropped into one group of compensation branch road, after thyristor 8 conductings, in the very short time, the coil of flexible switching controller 11 control contactors 6 makes it closed, and this moment, main circuit current was then by contactor 6, thyristor 8 is by bypass, obstructed overcurrent.

When reactive controller 12 sends the instruction of excision compensation branch road for flexible switching controller 11, the coil of flexible switching controller 11 control contactors 6, make it to disconnect, main circuit current forwards thyristor 8 at once to, flexible then switching controller 11 is judged the position of the auxiliary contact of contactor 6, if disconnected, stop the gate pole that triggering signal is exported to thyristor 8 at once, thyristor 8 is because self-characteristic has guaranteed that zero current turn-offs constantly.So just realized: thyristor 8 is not lossless by main circuit current when can guarantee switching no-flashy-flow, the operation constantly of thyristor 8 zero currents, has realized again finishing switching with thyristor 8, and contactor 6 can not produce electric arc because of charged deciliter.Prolonged the useful life of contactor 6, thyristor 8, capacitor 10, reactor 9 greatly.

Claims

1, the flexible switching device of a kind of high voltage variable low-pressure reactive compensation comprises high voltage bus (1), first circuit breaker (2), step-down transformer (3), low-voltage bus bar (4); Described first circuit breaker (2) end of incoming cables is connected on the described high voltage bus (1), and the leading-out terminal of first circuit breaker (2) is connected on the end of incoming cables of described step-down transformer (3), and the leading-out terminal of step-down transformer (3) is connected on the described low-voltage bus bar (4); It is characterized in that: comprise that also its end of incoming cables is connected second circuit breaker (5), contactor (6), diode (7), thyristor (8), reactor (9), the capacitor (10) on the low-voltage bus bar (4); The leading-out terminal of described second circuit breaker (5) is connected to an end of contactor (6) contact, the anode of diode (7), the negative electrode of thyristor (8), the anode of the other end of contactor (6) contact, the negative electrode of diode (7), thyristor (8) links together with the end of incoming cables of reactor (9) respectively, the end of incoming cables of the leading-out terminal of reactor (9) and capacitor (10) links together, and the leading-out terminal of capacitor (10) is received ground network; The negative electrode of thyristor (8), anode, gate pole are connected with flexible switching controller (11) respectively, coil, the auxiliary contact of contactor (6) are connected respectively to flexible switching controller (11), and the control end of flexible switching controller (11) is connected to the output of reactive controller (12).