CN201038775Y

CN201038775Y - Voltage-regulating capacitance-adjusting type transformer substation reactive automatic compensation device

Info

Publication number: CN201038775Y
Application number: CNU200720031382XU
Authority: CN
Inventors: 金黎
Original assignee: XI'AN SENBAO ELECTRIC ENGINEERING (SBEC) Co Ltd
Current assignee: XI'AN SENBAO ELECTRIC ENGINEERING (SBEC) Co Ltd
Priority date: 2007-03-20
Filing date: 2007-03-20
Publication date: 2008-03-19
Anticipated expiration: 2017-03-20

Abstract

The utility model discloses a transformer substation reactive automatic compensation device of a stepping voltage reactive regulation mode. The utility model comprises a stationary compensating and filter branch formed by a reactor and a capacitor which are in series, a voltage transformer, a current transformer, an SVR booster, a stationary capacitor unit, a breaker or a vacuum contactor provided with a fuser, a controller and a second-time line. The voltage transformer and the current transformer sample the voltage and the current on a high voltage bus bar and send the sampled signals to the controller. The controller controls the SVR booster through the second-time line, and a load tap switch of the SVR booster is controlled by a positive turning or a negative turning of a driving motor so as to further control a rising or falling of an end voltage of the stationary capacitor unit and to regulate the reactive power sent by the stationary capacitor unit, so as to reach an aim of scouting and compensating the reactive. The installation of the utility model is simple, and the maintenance is convenient, with high intelligent and automatic degree; the protection function is perfect; and a communication port is provided and a reliable communication with other equipment can be realized; and the utility model can be used in a rigid outdoor environment.

Description

Pressure regulating and capacitance regulating transformer station reactive power automatic compensation device

Technical field

The utility model relates to a kind of transformer station reactive power compensator, and is particularly a kind of by adjusting transformer station's reactive power automatic compensation device that the capacitor terminal voltage changes reactive compensation capacity.

Background technology

At present, in China transformer station, reactive power compensation adopts one group or two group capacitors usually, by one or two switch manual switchings, and there is more problem in such compensation way: (1) can not follow the tracks of compensating reactive power according to idle variation, and compensation effect is bad; (2) can not the meticulous compensation of classification, energy-saving effect is poor; (3) most of transformer stations use the circuit breaker switched capacitor, can not frequent operation, and switching frequency is few, and many transformer stations often do not use, and do not reach the compensation requirement; (4) compensation progression is few, can't accomplish according to the suitable input of required reactive power amount, overcompensation when light that can occur loading, situation such as undercompensation when load is heavy.Though some transformer station of China has adopted the multichannel High Voltage and Passive Automatic Compensation Device that reactive power is compensated,, can't accomplish smart thin benefit of mending because way is limited, effect is still undesirable, particularly inrush phenomenon threatens greatly fling-cut switch, causes the premature damage of switch easily.

Summary of the invention

At defective or the deficiency that above-mentioned prior art exists, the purpose of this utility model is, a kind of pressure regulating and capacitance regulating transformer station reactive power automatic compensation device is provided.

In order to realize above-mentioned task, thinking of the present utility model is: (1) string has the capacitor of reactance as fixed compensation, in automatic voltage regulator+fixed capacitor group except that a small amount of fixed compensation, how many a large amount of reactive powers follow the tracks of compensation according to the reactive power that electrical network lacked after fine graded, such thinking is not seen at home as yet any report; (2) utilize the method for regulating capacitor terminal voltage to regulate the reactive power compensation capacity, this method is very novel; (3) can realize the reactive power compensation of 35Kv, 10kV, three electric pressures of 6kV with automatic voltage regulator+fixed capacitor group, no-flashy-flow, not have and impact, do not cut off the power supply that meticulous adjusting reactive power realizes following the tracks of compensation; (4) the fixing reactive power compensation of capacitor has filtering again or suppresses humorous wave energy simultaneously, and automatic voltage regulator+fixed capacitor group has realized following the tracks of compensation, and quiet moving combination has high cost performance.

Adopt capacitor fixed compensation+automatic voltage regulator+fixed capacitor group compensation method, in the circuit with the capacitor fixed compensation, a certain proportion of reactor of connecting, realize filtering or suppress harmonic wave, also can compensate the capacitive reactive power of a constant volume simultaneously, the size of compensation capacity according to transformer station load when the lightest needed reactive power deduct the reactive power of automatic voltage regulator output voltage fixed capacitor group when minimum, automatic voltage regulator+fixed capacitor group is the major part that realizes following the tracks of compensation, its principle be reactive power size that the capacitor group is compensated be proportional to the capacitor terminal voltage square, the automatic voltage regulator output voltage can change, so the reactive power that the fixed capacity group is sent also can change, the fineness that changes depends on the gear number of automatic voltage regulator control on load tap changer, how idle the fineness of the more adjusting of gear number be high more, and commonly used is 9 grades and 7 grades at present.In order to save material, reduce cost, getting output voltage during the SVR voltage regulator design changes in (1-0.6) Un scope, then automatic voltage regulator+fixed capacitor group changes between (1-0.36) Qcm to the reactive power that electrical network sends, Qcm is the maximum reactive power that the fixed capacitor group is sent to electrical network, also the range of regulation of automatic voltage regulator further can be enlarged if necessary, make the adjustable range of reactive power further strengthen.

The technical solution that realizes above-mentioned thinking is: a kind of pressure regulating and capacitance regulating transformer station's reactive power automatic compensation device (SVQR), comprise that the fixed compensation and filter branch, voltage transformer, current transformer, SVR voltage regulator, fixed capacitor group, circuit breaker or the vacuum contactor that are made of series reactor and electric capacity add fuse, controller, secondary line, is characterized in that:

The voltage transformer that connects on the high voltage bus, current transformer and controller are connected, and controller links to each other with secondary line;

Circuit breaker that connects on the high voltage bus or vacuum contactor add fuse and are connected with automatic voltage regulator, and the automatic voltage regulator output links to each other with the fixed capacitor group by on load tap changer and drive motors;

Secondary line adds fuse with circuit breaker or vacuum contactor respectively and automatic voltage regulator links to each other;

The voltage transformer summation current transformer is sampled to the voltage and current on the high voltage bus and sampled signal is sent into controller, controller is controlled automatic voltage regulator by secondary line, the on load tap changer of automatic voltage regulator is subjected to the control of drive motors forward or reverse to change output voltage, and then the terminal voltage of control fixed capacitor group raises or reduction the reactive power size that adjusting fixed capacitor group is sent.

The compensation condenser of the utility model original manual switching in transformer station suitably minimizing capacity can be used as fixed compensation, other adds automatic voltage regulator+fixed capacitor group, capacity and adjustable range are selected according to the scope of idle variation, if transformer station had capacitor originally, can utilize again fully, all parts all can be out of doors, do not need any casing, the cement platform adopts two bridges if all can be installed, controller is by the on load tap changer of the secondary line control automatic voltage regulator position of transferring the files, thereby change the output voltage of SVR voltage regulator, owing to be connected on the fixed capacitor group terminal voltage of automatic voltage regulator output variation has taken place, therefore variation has also taken place in the reactive power of sending, like this, just adjusting reactive power that can be meticulous is within the specific limits followed the tracks of the required reactive power of compensation substation bus bar.

The result of use of pressure regulating and capacitance regulating of the present utility model transformer station reactive power automatic compensation device is: install simple, convenient, the reliability height of device.Give the reactor of series connection suitable capacity in the capacitor fixed compensation circuit, not only limited the inrush phenomenon of capacitor, and can suppress or the filtering harmonic wave, avoid or reduced that the possibility that harmonic current amplifies takes place the access owing to compensation condenser on the high-tension line, thereby avoid or reduced the harm of harmonic wave electrical network and equipment.Automatic voltage regulator+fixed capacitor group can be realized meticulous tracking reactive power compensation under the condition that does not break away from electrical network and do not cut off the power supply, no-flashy-flow, nothing are impacted, and operate steadily reliable operation.

Description of drawings

Fig. 1 is a key wiring diagram of the present utility model;

Fig. 2 is the controller block diagram of the utility model device;

Fig. 3 is the signal processing and the output circuit of controller;

Fig. 4 is the power supply and the signal acquisition circuit plate of controller;

Fig. 5 is the dsp software flow chart of controller;

Fig. 6 is the major cycle schematic diagram of controller;

In order more to be expressly understood the utility model device, the utility model device is described in further detail below in conjunction with accompanying drawing and instantiation.

Embodiment

Technical scheme according to the utility model device, the utility model pressure regulating and capacitance regulating autocompensation installation (SVQR) adopts the capacitor fixed compensation to add stepping automatic voltage regulator (SVR), the output of stepping automatic voltage regulator connects one group of fixed capacitor group, its principle wiring comprises that the fixed compensation and filter branch 1, voltage transformer 4, current transformer 5, SVR voltage regulator 2, fixed capacitor group 3, circuit breaker or the vacuum contactor that are made of series reactor L and capacitor C add fuse 8, controller 6, secondary line 7 as shown in Figure 1;

The voltage transformer 4 that connects on 10kv or 35kv, the 6kv high voltage bus, current transformer CT (5) are connected with controller 6, and controller 6 links to each other with secondary line 7;

Circuit breaker that connects on the high voltage bus or vacuum contactor add fuse 8 and are connected with SVR voltage regulator 2, and SVR voltage regulator 2 outputs link to each other with fixed capacitor group 3 by on load tap changer 8 and drive motors 9;

Secondary line 7 adds fuse 8 with circuit breaker or vacuum contactor respectively and SVR voltage regulator 2 links to each other;

Voltage and current on 5 pairs of high voltage bus of voltage transformer 4 summation current transformers is sampled and sampled signal is sent into controller 6, controller 6 is by secondary line 7 control SVR voltage regulators 2, the on load tap changer 8 of SVR voltage regulator 2 is subjected to the control of drive motors 9 forward or reverse, and then the terminal voltage of control fixed capacitor group 3 raises or reduction the reactive power size that adjusting fixed capacitor group 3 is sent.

Voltage transformer 4 is provided by the SVR pressure regulator body or external, sample rate current instrument transformer 5 must be external; be used for low-voltage power supply, overcurrent protection so that gather built-in voltage transformer 5 of bus current, SVR pressure regulator body and external current transformer 4; controller 6 is used for the voltage and current of the high voltage bus of gathering is calculated the reactive power and the power factor of bus; the output voltage of accurate control SVR voltage regulator 2; thereby the capacitive reactive power of the fixed capacitor group 3 that meticulous adjusting is used to compensate realizes following the tracks of compensation.Electronic devices and components that the utility model device is used and low voltage component all are placed in the small box.Sample rate current instrument transformer 5 generally is placed on the bar, can also put lightning arrester and fuse on the bar.

Voltage transformer 4, current transformer 5, fixed compensation and filter branch 1, SVR controller 6 connect as one.SVR voltage regulator 2 and on load tap changer 8 connect as one.

Fig. 2 is the controller block diagram of the utility model device.Controller 6 comprises by digital signal processor (DSP), be connected with sampled signal input module, control signal output module, LCD display circuit, RS232 communication interface on the digital signal processor (DSP) respectively, the control signal output module is connected with relay, and the RS232 communication interface is connected with unlimited communication module.Digital signal processor (DSP) is analyzed, calculates, is compared the sampled signal of being sent here by the sampled signal input module, and whether decision exports control signal to output module.The RS232 communication interface both can be used for directly and the external equipment communication, also can with carry out wireless telecommunications after wireless communication module is connected.

Fig. 3 a, Fig. 3 b are the signal processing and the output circuit of controller.This circuit is advanced by digital signal processor (DSP) TMS320F2808, string and goes out chip SN74ALS164, power supply chip TDS767D318 and light lotus root 4N33 forms.This circuit acceptance is handled with DSP from the signal that signal acquisition circuit sends, and judging whether needs to increase and decrease the reactive power that compensation condenser sends, and output signal is connected with control assembly by relay.

Fig. 4 a, Fig. 4 b are the power supply and the signal acquisition circuit plate of controller.This circuit is made up of control transformer, power supply chip R785.0, amplifier TLC2262, voltage transformer summation current transformer etc.Its effect is acquisition system voltage, system power and condenser current, and it is nursed one's health, and gives digital signal processor DSP and carries out analyzing and processing.

Fig. 5 and Fig. 6 are respectively the dsp software flow chart and the software major cycle schematic diagram of controller.The software design of the controller of the utility model device becomes regularly multitask structure, i.e. timing interrupt call display subroutine, and time for reading, store historical data.The serial communication of digital signal processor DSP is interrupted the information that receives is deposited in buffering area, shows after waiting to finish receiving, and realizes communication function by the RS232 communication interface.The workflow of software is: promptly sample after the initialization, electric weight calculating, harmonic analysis, judgement system mode, serial communication, the differentiation of moving then, comprise that the gear that starts time-delay, setting-up time, compensation condenser group terminal voltage shows, and the rising or the reduction of decision compensation condenser group terminal voltage.

The utility model pressure regulating and capacitance regulating transformer station reactive power automatic compensation device installation process is simple, easy to maintenance, and indoor and outdoor all can be used.Not only can compensating reactive power, and can detect and the filtering harmonic wave, thereby can increase the fail safe of device and purify electrical network.Its control algolithm advanced person, the controller circuitry novelty, defencive function is perfect, intelligent and automaticity height, and communication interface is easily arranged, can carry out reliable communication with miscellaneous equipment.And accommodative ability of environment is strong, uses under the adverse circumstances out of doors, does not have for the user who is located in adverse circumstances to be suspected to have very big attraction.

Claims

1. transformer station's reactive power automatic compensation device of adjusting of a stepping voltage power-less, comprise that the fixed compensation and filter branch (1), voltage transformer (4), current transformer (5), stepping automatic voltage regulator (2), fixed capacitor group (3), circuit breaker or the vacuum contactor that are made of series reactor (L) and electric capacity (C) add fuse (8), controller (6), secondary line (7), is characterized in that:

The voltage transformer that connects on the high voltage bus (4), current transformer (5) and controller (6) are connected, and controller (6) links to each other with secondary line (7);

Circuit breaker that connects on the high voltage bus or vacuum contactor add fuse (8) and are connected with stepping automatic voltage regulator (2), and stepping automatic voltage regulator (2) output links to each other with fixed capacitor group (3) by on load tap changer (8) and drive motors (9);

Secondary line (7) adds fuse (8) with circuit breaker or vacuum contactor respectively and stepping automatic voltage regulator (2) links to each other;

Voltage transformer (4) summation current transformer (5) is sampled to the voltage and current on the high voltage bus and sampled signal is sent into controller (6), controller (6) is by secondary line (7) control SVR voltage regulator (2), the on load tap changer (8) of SVR voltage regulator (2) is subjected to the control of drive motors (9) forward or reverse, and then the terminal voltage of control fixed capacitor group (3) raises or reduction, regulates the reactive power size that fixed capacitor group (3) is sent.

2. transformer station's reactive power automatic compensation device that stepping voltage power-less as claimed in claim 1 is adjusted, it is characterized in that, described controller (6) comprises by digital signal processor, be connected with sampled signal input module, control signal output module, LCD display circuit, RS232 communication interface on the digital signal processor respectively, the control signal output module is connected with relay, and the RS232 communication interface is connected with unlimited communication module.

3. transformer station's reactive power automatic compensation device that stepping voltage power-less as claimed in claim 1 is adjusted, it is characterized in that described secondary line (7) is by the gear display circuit of control power supply, air switch, controller loop, SVR voltage regulator, the transfer the files circuit and the circuit of manually transferring the files formed automatically.

4. transformer station's reactive power automatic compensation device that stepping voltage power-less as claimed in claim 1 is adjusted, it is characterized in that described current transformer (4), voltage transformer (5), fixed compensation and filter branch (1), stepping automatic voltage regulator (6) connect as one.

5. transformer station's reactive power automatic compensation device that stepping voltage power-less as claimed in claim 1 is adjusted is characterized in that described stepping automatic voltage regulator (2) and on load tap changer (8) connect as one.