CN209545165U - A kind of SVG mixed compensation three-phase imbalance controlling device - Google Patents
A kind of SVG mixed compensation three-phase imbalance controlling device Download PDFInfo
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- CN209545165U CN209545165U CN201920328174.9U CN201920328174U CN209545165U CN 209545165 U CN209545165 U CN 209545165U CN 201920328174 U CN201920328174 U CN 201920328174U CN 209545165 U CN209545165 U CN 209545165U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The utility model relates to a kind of electric energy quality optimizing of field of electrical equipment and electric power energy-saving device, especially a kind of SVG mixed compensation three-phase imbalance controlling device.Described device is that static reactive generator (SVG) and TSC unit (thyristor switchable capacitor) is formed, and wherein TSC unit includes single-phase compensation, alternate compensation, is uniformly controlled by static reactive generator (SVG).TSC unit carries out coarse adjustment three-phase imbalance, in addition static reactive generator (SVG) quickly finely continuously adjusts, combination can be realized together adjusts dynamic reactive current, the active quickly accurate continuous three-phase imbalance that carries out of three-phase, the response speed and precision of the alternate compensation system of traditional capacitance are overcome, while device cost performance is also very high.
Description
Technical field
The utility model relates to electrical equipment technical field, especially a kind of SVG mixed compensation three-phase imbalance administers dress
It sets.
Background technique
With the continuous growth of nearly more than ten years national economy, living standards of the people are increased substantially, urban and rural residents' electricity consumption,
Commercial power is greatly improved in power supply total amount.But it is numerous in urban distribution network or rural power grids mesolow single-phase equipment,
And there is uncertainties for electricity consumption；The power grid of productive power and residential electricity consumption mixing, threephase load is in a basic balance daytime, negative at night
Lotus peak period imbalance degree is quite serious.The characteristics of this kind of load is that three-phase production and single-phase domestic load are all very big.
Daytime is mainly productive power, and three-phase voltage relatively balances.Because single-phase household electricity distributes unevenness on three-phase, to be formed at night
Household electricity peak period three-phase current differs greatly；Single-phase load in building building mainly has illumination, electric appliance, office to set
Standby, computer etc.；Three-phase load mainly has elevator, water pump, blower, the hollow equipment of withering of collection etc..And in practical applications, because of water
The three-phase equipments such as pump, blower are often on the shelf, cause single-phase load proportion high.Single-phase equipment is more, and power load is about
The 70% of total capacity is accounted for, the randomness that single-phase load uses is big, and is concentrated mainly on daytime plus commercial power, and residential electricity consumption
It is concentrated mainly on night, the uneven situation of load can change according to the time, and plus Seasonal electrical equipment
It uses, it is seriously uneven to further cause low-voltage distribution system three-phase load.
Influence of the three-phase imbalance load to electric system mainly has following several respects:
(1) increase the electric energy loss of route.In three-phase four-wire power supply network, when electric current passes through line conductor, because depositing
Loss will be produced electricl energy in impedance, loss with pass through the square directly proportional of electric current.When low voltage electric network is supplied with three-phase four-wire system
When electric, due to causing threephase load imbalance unavoidable with the presence of single-phase load.When threephase load off-center operation, in
Property line i.e. there is electric current to pass through.Not only phase line is lossy in this way, and the neutral conductor also generates loss, to increase power network line
Loss.
(2) increase the electric energy loss of distribution transformer.Distribution transformer is the power supply main equipment of low voltage electric network, when its
When being run under threephase load imbalance operating condition, it will cause the increase of distribution loss.Because the power loss of distribution transforming is with load
Degree of unbalancedness and change.
(3) distribution transforming power output is reduced, and overload capacity can also reduce.If distribution transforming is run under overload conditions, easily cause
Distribution transforming fever, even will cause distribution transforming scaling loss when serious.
(4) distribution transforming generates zero-sequence current, and zero-sequence current makes the steel member local temperature of distribution transforming increase fever, leads to equipment
Service life reduction.Meanwhile zero-sequence current deposits the loss that also will increase distribution transforming.
(5) safe operation of electrical equipment is influenced.Distribution transforming is run in threephase load imbalance, and the neutral conductor just has electricity
Stream passes through, and such case can seriously jeopardize the safe operation of electrical equipment.
Threephase load imbalance leads to the active uneven and idle imbalance of three-phase of three-phase, and three-phase currently on the market is uneven
Weighing apparatus controlling device only administers the idle imbalance of three-phase using capacitor mostly, and minority administers the active injustice of three-phase using SVG
Weighing apparatus.If only administering three-phase imbalance with SVG, it is at high cost to have a SVG, and loss is big, and SVG manufacture production is complicated, and environment is suitable
Answering property is not high, and maintenance is complicated, if using capacitor merely, the capacity there are capacitor is fixed, capacitor switching response
Slowly, three-phase imbalance cannot finely be administered.
Utility model content
It is uneven that a kind of SVG mixed compensation three-phase is provided purpose of the utility model is to solve the deficiency of above-mentioned technology
Weigh controlling device, realizes the active and idle fine improvement of three-phase imbalance.
In order to achieve the above object, a kind of SVG mixed compensation three-phase imbalance controlling device designed by the utility model,
Including system power mutual inductor, breaker, device current transformer, arrester, fastp-acting fuse, static reactive generator, TSC
Unit, the breaker upper end is as power input, the static reactive generator and No.1 TSC unit, No. two TSC
Unit, No. three TSC units are connected in parallel on the three-phase copper bar of breaker lower end, the arrester connect breaker lower end copper bar with connect
Between ground, end is provided with system power mutual inductor on-board the circuit breaker, and the lower end of breaker is provided with device current transformer, quiet
Only reacance generator is connect with system power mutual inductor, for detecting the total three-phase current of distribution system, static reactive generator
It is also connect with device current transformer, for detecting the total current of static reactive generator and three TSC units；In static reacance
It is respectively set between generator, No.1 TSC unit, No. two TSC units, No. three TSC units and the three-phase copper bar of breaker lower end
One fastp-acting fuse, the TSC unit include capacitor and thyristor switch, and the I/O of static reactive generator exports control
Terminal processed is connected with the control input terminal of thyristor switch；Single-phase capacitance, the capacitive coupling of thyristor switch control TSC unit
Switching.
The static reactive generator (SVG) electric current total by system power mutual inductor detection system, using based on ip-
The three-phase instantaneous reactive power theory of iq fast and accurately calculates the electricity such as the active and reactive of system three-phase, tri-phase unbalance factor
Measure parameter, then static reactive generator (SVG) calculates adjusting three-phase imbalance, three-phase respectively needed for it is idle and active.
Static reactive generator (SVG) calculates single-phase, alternate electricity according to single-phase, the capacitive coupling parameter that have been set input in advance
The active and reactive increase and decrease amount of three-phase after holding investment and cutting off.Static reactive generator (SVG) is according to nothing needed for system three-phase difference
Function, watt current control static reactive generator (SVG) export electric current, and when SVG exports maximum rated current, system three-phase is not
When the degree of balance is not achieved≤3%, SVG controls suitable single-phase, the capacitive coupling investment of thyristor selection, while passing through device electric current
Mutual inductor detects TSC unit and the total electric current of SVG unit, the reactive current, watt current needed for fine-tuning three-phase respectively from
And it reaches and quickly fine-tunes active and idle three-phase equilibrium.
A kind of obtained SVG mixed compensation three-phase imbalance controlling device of the utility model, has the advantage that
1, SVG control itself output and thuristor throw-in and throw-off is single-phase, capacitive coupling coordinates output, overcomes single-phase, alternate electricity
Hold fixed capacity, realizes that the active and idle imbalance of three-phase finely continuously adjusts；
2, the SVG manufacturing, maintenance cost are very high, and complex process, running wastage is big, and environmental operating conditions require height,
Simply, simple process, operation is low in energy consumption, and environmental operating conditions are low, the capacitor of mature and reliable for, maintenance low using manufacturing cost
Part SVG capacity is substituted, totle drilling cost is reduced, cost performance is high；
3, quickly compensation, device response time < 5ms；
4, SVG has self-diagnostic function, and when SVG failure or TSC cell failure, trouble unit stops output, other lists
Member works normally, the reliability of enhancement device.
Detailed description of the invention
Fig. 1 is the electrical principle block diagram of the utility model；
Fig. 2 is the control structure figure of the utility model.
Specific embodiment
Below by embodiment combination attached drawing, the utility model will be further described.
Embodiment 1:
As shown in Figure 1, a kind of SVG mixed compensation three-phase imbalance controlling device of the present embodiment description, including system electricity
Current transformer 1, breaker 2, device current transformer 3, arrester 4, fastp-acting fuse 5, static reactive generator 6, TSC are mono-
Member, 2 upper end of breaker is as power input, the static reactive generator 6 and No.1 TSC unit, No. two TSC
Unit, No. three TSC units are connected in parallel on the three-phase copper bar of 2 lower end of breaker, and the arrester 4 connects in 2 lower end copper bar of breaker
Between ground connection, system power mutual inductor 1 is provided on the power source bus of the power input of breaker 2, in breaker 2
Lower end is provided with device current transformer 3, and static reactive generator 6 is connect with system power mutual inductor 1, for detecting power distribution system
It unites total three-phase current, static reactive generator 6 is also connect with device current transformer 3, for detecting static reactive generator 6
With the total current of three TSC units；Static reactive generator 6, No.1 TSC unit, No. two TSC units, No. three TSC units with
A fastp-acting fuse 5 is respectively set between the three-phase copper bar of 2 lower end of breaker, the TSC unit includes capacitor 7 and crystalline substance
I/O output control terminal of thyristor switch 8, static reactive generator 6 is connected with the control input terminal of thyristor switch 8；It is brilliant
Single-phase capacitance, the capacitive coupling switching of the control TSC unit of thyristor switch 8.
Thyristor switch 8 and capacitor 7 are connected in series, with triangle connection and star-like connection, parallel connection access three-phase alternating current
Power grid, as alternate compensation and single-phase compensation.Static reactive generator (SVG) output is alternate with the thuristor throw-in and throw-off of TSC unit
Capacitor is uniformly controlled by static reactive generator (SVG).
As shown in Fig. 2, the condenser capacity parameter of No.1 TSC unit, No. two TSC units, No. two TSC units be input to it is quiet
Only reacance generator (SVG).Static reactive generator (SVG) detects power grid three-phase voltage, the three-phase total current of source side, device
Total current, using the three-phase instantaneous reactive power theory of ip-iq fast and accurately calculate system, load, device three-phase
Active and reactive electric current, tri-phase unbalance factor, the electrical parameters such as power factor (PF), then according to power factor (PF) target set point meter
Reactive current and the improvement active unbalanced watt current of three-phase needed for calculating three-phase respectively.Static reactive generator (SVG)
Watt current, the reactive current of the every phase increase of three-phase or reduction are calculated according to the capacitive coupling of TSC unit.Static reacance hair
Raw device (SVG) controls the active and reactive current that alternate thyristor switchable capacitor carries out coarse adjustment three-phase imbalance, then quiet
Only reacance generator (SVG) finely administers three-phase using itself can quickly export inductive reactive power, capacitive reactive power, compensation watt current
It is uneven.When the fluctuation of load is smaller, fluctuation it is idle and active fewer, static reactive generator (SVG) can be compensated quickly,
TSC unit frequent switching is reduced, voltage fluctuation is reduced, enhances the stability of system.
The capacity of static reactive generator (SVG) and TSC cell capability in SVG mixed compensation three-phase imbalance controlling device
Configuration, preferably presses capacity >=TSC unit total capacity of static reactive generator (SVG).The response time of thyristor switchable capacitor
≤ 20ms, SVG complete response time < 5ms, when load reduces suddenly, the capacitor to have put into operation has little time to cut off, system
Capacitive reactive power is excessive, needs to compensate inductive reactive power, and static reactive generator (SVG) can compensate inductive reactive power and offset capacitor
Capacitive reactive power.The capacity of static reactive generator (SVG) >=TSC unit total capacity is, it can be achieved that mixed compensation three-phase imbalance connects
It is continuous to adjust.The response speed and static reactive generator (SVG) response speed one of SVG mixed compensation three-phase imbalance controlling device
Sample avoids purely capacitive three-phase imbalance controlling device response speed, while decreasing SVG capacity, reduces entire dress
The cost set.
Claims (1)
1. a kind of SVG mixed compensation three-phase imbalance controlling device, it is characterized in that: including system power mutual inductor, breaker, dress
Current transformer, arrester, fastp-acting fuse, static reactive generator, TSC unit are set, the breaker upper end is as electricity
Source input terminal, the static reactive generator and No.1 TSC unit, No. two TSC units, No. three TSC units are connected in parallel on open circuit
On the three-phase copper bar of device lower end, the arrester is connect between breaker lower end copper bar and ground connection, and end is provided with on-board the circuit breaker
System power mutual inductor is provided with device current transformer in the lower end of breaker, and static reactive generator is mutual with system power
Sensor connection, for detecting the total three-phase current of distribution system, static reactive generator is also connect with device current transformer, is used
In the total current of detection static reactive generator and three TSC units；In static reactive generator, No.1 TSC unit, No. two
A fastp-acting fuse, the TSC is respectively set between TSC unit, No. three TSC units and the three-phase copper bar of breaker lower end
Unit includes capacitor and thyristor switch, I/O output control terminal of static reactive generator and the control of thyristor switch
Input terminal is connected；Single-phase capacitance, the capacitive coupling switching of thyristor switch control TSC unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920328174.9U CN209545165U (en) | 2019-03-15 | 2019-03-15 | A kind of SVG mixed compensation three-phase imbalance controlling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920328174.9U CN209545165U (en) | 2019-03-15 | 2019-03-15 | A kind of SVG mixed compensation three-phase imbalance controlling device |
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| CN209545165U true CN209545165U (en) | 2019-10-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110943461A (en) * | 2019-11-25 | 2020-03-31 | 国网辽宁省电力有限公司本溪供电公司 | Intelligent integrated power distribution device applied to low-voltage transformer area and method thereof |
| CN112993909A (en) * | 2021-04-30 | 2021-06-18 | 贵州电网有限责任公司 | Low-voltage transformer area online ice melting device and method based on three-phase unbalance management device |
-
2019
- 2019-03-15 CN CN201920328174.9U patent/CN209545165U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110943461A (en) * | 2019-11-25 | 2020-03-31 | 国网辽宁省电力有限公司本溪供电公司 | Intelligent integrated power distribution device applied to low-voltage transformer area and method thereof |
| CN112993909A (en) * | 2021-04-30 | 2021-06-18 | 贵州电网有限责任公司 | Low-voltage transformer area online ice melting device and method based on three-phase unbalance management device |
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