CN203734316U

CN203734316U - Device for bidirectional reactive voltage regulation

Info

Publication number: CN203734316U
Application number: CN201420043956.5U
Authority: CN
Inventors: 张京利; 李文奇; 刘成军
Original assignee: ANHUI HUAZHENG ELECTRIC Co Ltd
Current assignee: ANHUI HUAZHENG ELECTRIC Co Ltd
Priority date: 2014-01-23
Filing date: 2014-01-23
Publication date: 2014-07-23
Anticipated expiration: 2024-01-23

Abstract

The utility model discloses a device for bidirectional reactive voltage regulation, and relates to a high voltage bus. The device includes a transformer, an on-load tap switch, a first circuit breaker, a second circuit breaker, a capacitor bank, an electric reactor, a current transformer, a voltage transformer, and a controller; a tap of the transformer is electrically connected with the on-load tap switch; the on-load tap switch is electrically connected with the first and second circuit breakers; the first circuit breaker is electrically connected with the electric reactor; the second circuit breaker is electrically connected with the capacitor bank; the controller is electrically connected with the on-load tap switch, the first circuit breaker, the second circuit breaker, the current transformer, and the voltage transformer; and the on-load tap switch, the current transformer, and the voltage transformer are electrically connected with the high voltage bus. The device of the utility model is simple in structure, capable of the voltage bidirectional regulation, free of inrush current and current impact, precise in voltage control, and capable of effectively improve the voltage stability and qualified rate of the local power grid, so that the power supply and distribution system is more secure and stable.

Description

A kind of device of two-way idle regulation voltage

Technical field

The utility model relates to a kind of device of two-way idle regulation voltage.

Background technology

Voltage is an important mark weighing the quality of power supply, and quality of voltage has influence on the power supply quality of electric power system on the one hand, also has influence on the problem such as safe operation of power system and economical operation simultaneously.Overtension or too low life-span and the efficiency, particularly voltage collapse that all can affect electric equipment, once caused electric power system to lose the even large area blackout of loading, and causes great loss.

The voltage levvl of electric power system, it is the concrete manifestation of power system reactive power balance, in supply network, most load all needs reactive power, its reactive power must obtaining from network somewhere, although reactive power does not consume the energy substantially, reactive power can cause active loss and voltage loss along electrical network transmission.

Along with popularizing of distributed power generation, as: the access electrical network of wind-powered electricity generation, photoelectricity, small power station, due to the fluctuation of its energy output, the fluctuation of power load, can cause the fluctuation of voltage along the line, for example: be connected to small power station's unit along the line, when light hours wet season supply power voltage can raise, dry season, voltage can reduce when heavy load, its fluctuation on the impact of line voltage far away higher than the requirement of standard GB/T/T12325-2008.

Reactive power compensation is to ensure the qualified key factor of voltage, and reactive power compensation is divided into again capacitive compensation and perception compensation, lacks capacitive reactive power, and low voltage, lacks perception idle, and voltage is higher.At present, the control method that line voltage is conventional mainly contains two kinds: the one, by adjusting the pressure regulation of main transformer of transformer substation load tap changer, regulate according to can only be taking substation bus bar voltage as benchmark, can not ensure the voltage stabilization of each circuit, and it is larger on the safe operation impact of main transformer frequently to adjust main transformer tap; Another kind method is the regulative mode that adopts grouping switching capacitor group, but its reactive power compensation is discontinuous, has level, can not obtain desirable compensation effect.In peak times of power consumption, there is the capacitor group of level often not reach compensation capacity; And in low power consumption, there is sending even repeatedly idle phenomenon.What switch on-off electric capacity caused shoves all extremely harmful to system and equipment itself with overvoltage, because electric network reactive-load changes soon, the frequent switching of capacitor, shortens capacitor life-span again, capacitor often damages, and seriously reduces the electrical network quality of power supply and power supply reliability.

In Chinese Patent Application No.: disclose a kind of mesohigh bidirectional reactive automatic regulating apparatus in 200820039992, it is made up of the simple bus of transformer, transformer secondary output bus, microcomputerized controller, voltage detecting instrument transformer, current detecting instrument transformer, on-load tap-changing transformer, control box, degree of depth automatic coupling voltage regulator, capacitor group and Reactor banks, capacitor's series Reactor banks, K switch 1, K2.Its principal character is by the break-make of microcomputerized controller control switch K1, K2, thereby carrys out the idle character of regulation output, realizes two-way reactive power compensation, to reach raising power supply quality, reduces the requirement of loss.Its principal character is that described degree of depth automatic coupling voltage regulator comprises an on load tap changer, by the gear contact of microcomputer regulating and controlling on load tap changer, thereby realizes real-time pressure regulation, realizes the real-time regular variation of idle output.Although this technical scheme can be carried out the two-way idle adjusting of appropriateness, result complexity, cost is high.

Utility model content

For the problems referred to above, it is a kind of simple in structure that the utility model provides, and can carry out to voltage the device of the two-way idle regulation voltage of two-way idle adjusting.

In order to address the above problem, the technical scheme that the utility model provides is:

A device for two-way idle regulation voltage, relates to high voltage bus, comprises transformer, on load tap changer, first, second circuit breaker, capacitor group, reactor, current transformer, voltage transformer, controller; Tap on described transformer is electrically connected with described on load tap changer, and described on load tap changer is connected with described first, second circuit breaker electric; Described the first circuit breaker is electrically connected with described reactor; Described the second circuit breaker is electrically connected with described capacitor group; Described controller is electrically connected with described on load tap changer, first, second circuit breaker, described current transformer, voltage transformer, and described on load tap changer, current transformer, voltage transformer are electrically connected with described high voltage bus.Controller gathers the voltage of high voltage bus by current transformer, voltage transformer, calculate the numerical value such as apparent power, active power, reactive power, power factor (PF), controller is according to the high voltage bus voltage and the reference voltage comparison that collect, when high voltage bus voltage is greater than reference voltage, controller control the second circuit breaker disconnects, the first breaker closing, carries out perceptual idle adjusting; When high voltage bus voltage is less than reference voltage, controller control the first circuit breaker disconnects, and the second breaker closing, carries out capacitive reactive power adjusting.

Preferably, the quantity of described tap is 9; Driving switch on load tap changer is 9, thus arrange 9 taps respectively with on load tap changer on driving switch be used in conjunction with.

Preferably, described 9 tap voltages are: by first square of described transformer bus magnitude of voltage, then be multiplied by respectively 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, finally distinguish evolution again; Design is in the time carrying out two-way idle regulation voltage like this, and no-flashy-flow, no current impact, and control voltage accurate.

Compared with prior art, the beneficial effects of the utility model are:

The utility model is simple in structure, can two-way idle regulation voltage, and no-flashy-flow, no current impact, and control voltage accurate, can effectively improve voltage stability and the qualification rate of partial electric grid, make power supply-distribution system safety and stability more.

Brief description of the drawings

Fig. 1 is the utility model structure principle chart.

In figure: 1, transformer, 2, on load tap changer, 3, the first circuit breaker, 4, the second circuit breaker, 5, capacitor group, 6, reactor, 7, current transformer, 8, voltage transformer, 9, controller, 10, high voltage bus, 11, tap.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described further:

In conjunction with Fig. 1, the device of a kind of two-way idle regulation voltage of the present utility model, relate to high voltage bus 10, comprise transformer 1, on load tap changer 2, first, second circuit breaker, capacitor group 5, reactor 6, current transformer 7, voltage transformer 8, controller 9; 9 taps 11 on transformer 1 are electrically connected with on load tap changer 2, and on load tap changer 2 is connected with first, second circuit breaker electric; The first circuit breaker 3 is electrically connected with reactor 6; The second circuit breaker 4 is electrically connected with capacitor group 5; Controller 9 is electrically connected with on load tap changer 2, first, second circuit breaker, current transformer 7, voltage transformer 8, and on load tap changer 2, current transformer 7, voltage transformer 8 are electrically connected with high voltage bus 10.

Driving switch on load tap changer 2 is 9, thus arrange 9 taps 11 respectively with on load tap changer 2 on driving switch be used in conjunction with.

9 tap 11 voltages are set to: by transformer 1 bus voltage value square, then be multiplied by respectively 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, finally distinguish evolution again.

Controller 9 is by current transformer 7, voltage transformer 8 gathers the voltage of high voltage bus 10, calculate apparent power S, active-power P, reactive power Q, the numerical value such as power factor (PF), controller 9 is according to high voltage bus 10 voltages and the reference voltage comparison that collect, when high voltage bus 10 voltages are greater than reference voltage, controller 9 is controlled the second circuit breaker 4 and is disconnected, the first circuit breaker 3 closures, controller 9 is according to apparent power S, active-power P, reactive power Q, the Numerical Control on load tap changeres 2 such as power factor (PF), regulate the voltage at reactor 6 two ends, until high voltage bus 10 voltages reach requirement, when high voltage bus 10 voltages are less than reference voltage, controller 9 is controlled the first circuit breaker 3 and is disconnected, the second circuit breaker 4 closures, controller 9 is according to Numerical Control on load tap changeres 2 such as apparent power S, active-power P, reactive power Q, power factor (PF)s, the voltage at regulating capacitor group 5 two ends, until high voltage bus 10 voltages reach requirement.

More than show and described general principle of the present utility model, principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. a device for two-way idle regulation voltage, is characterized in that: relate to high voltage bus, comprise transformer, on load tap changer, first, second circuit breaker, capacitor group, reactor, current transformer, voltage transformer, controller; Tap on described transformer is electrically connected with described on load tap changer, and described on load tap changer is connected with described first, second circuit breaker electric; Described the first circuit breaker is electrically connected with described reactor; Described the second circuit breaker is electrically connected with described capacitor group; Described controller is electrically connected with described on load tap changer, first, second circuit breaker, current transformer, voltage transformer, and described on load tap changer, current transformer, voltage transformer are electrically connected with described high voltage bus.

2. the device of two-way idle regulation voltage according to claim 1, is characterized in that: the quantity of described tap is 9.

3. the device of two-way idle regulation voltage according to claim 2, it is characterized in that: described tap voltage is first square of described transformer bus voltage, be multiplied by respectively again 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, finally evolution again.