CN106997804A - Three winding flexibility ULTC, low-voltage network system and control method - Google Patents
Three winding flexibility ULTC, low-voltage network system and control method Download PDFInfo
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- CN106997804A CN106997804A CN201710358011.0A CN201710358011A CN106997804A CN 106997804 A CN106997804 A CN 106997804A CN 201710358011 A CN201710358011 A CN 201710358011A CN 106997804 A CN106997804 A CN 106997804A
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- winding
- voltage
- converter
- ultc
- flexible
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
The invention discloses the flexible ULTC of three winding, low-voltage network system and control method, a kind of flexible ULTC of three winding, including the winding of first winding first, the winding of secondary winding second and the secondary winding tertiary winding, wherein the capacity of second winding is more than the tertiary winding；The tertiary winding is sequentially connected AC DC AC converter and coupling transformer.Active power distribution network multi-frequency yardstick voltage pulsation can quickly be suppressed.Output voltage can be continuously adjusted, with non differential regulation characteristic.It is reliable in the absence of mechanical action structure.
Description
Technical field
Match somebody with somebody the present invention relates to distribution network technology field, more particularly to a kind of flexible ULTC of three winding, low pressure
Network system and control method.
Background technology
In recent years, with the access of power electronics power device, the popularization of the power supply of distribution type renewable energy, power distribution network
The quality of power supply faces lot of challenges.The access of renewable TRT causes power distribution network to become active by passive network in power distribution network
The direction of energy in network, power distribution network becomes two-way flow by single-phase flow.In passive power distribution net, the voltage of line end
Often below circuit top voltage, and in active power distribution network, relation is by renewable energy power generation between circuit top, terminal voltage
Power and electric power are together decided on, therefore the intermittent power producing characteristics of regenerative resource cause distribution network voltage amplitude interval occur
Property change, when regenerative resource exerts oneself larger, distribution network voltage amplitude is higher, whereas a lower, serious to threaten electricity consumption in power distribution network
Equipment safety.
ULTC can change the output voltage width of secondary side by changing transformer primary side tap
Value, but this method can increase the reactive requirement of primary side, and degree of regulation, governing speed are limited, are not suitable for multifrequency
The active power distribution network of rate yardstick changed power characteristic.Dynamic electric voltage recovery device (DVR) has offset voltage fluctuation in the short time
Ability, but because DVR had operationally not only needed output idle but also needed output active, therefore DVR needs to be equipped with certain capacity
Energy storage device, adds the operating cost and maintenance cost of system.Therefore, it is quick regulation active power distribution network voltage pulsation, it is anxious
Need a kind of low cost, the solution of high reliability.
The content of the invention
The purpose of the present invention is exactly that there is provided the flexible ULTC of a kind of three winding, low in order to solve the above problems
Network system and control method are press-fitted, on-load voltage regulation part is mainly made up of semiconductor devices, in the absence of mechanical action structure, rung
Answer speed fast, it is stable.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of flexible ULTC of three winding, including the winding of first winding first, the winding of secondary winding second and
The secondary winding tertiary winding, wherein the capacity of second winding is more than the tertiary winding；The tertiary winding is sequentially connected
AC-DC-AC converter and coupling transformer.
First winding uses Y type wiring, and the second winding uses Y type wiring, and the tertiary winding uses triangular form wiring.
The output voltage ratio of three windings is 35/10/0.38kv, and Capacity Ratio is 100/100/15.
AC-DC-the AC converter includes uncontrollable rectifier device part, DC capacitor and the inverter being sequentially connected
Part；The alternating current that uncontrollable rectifier is used for exporting the tertiary winding is changed into direct current；DC capacitor is used for storing direct current energy, put down
Press down DC voltage fluctuation；DC inverter is alternating current by inverter section.
The coupling transformer primary side connect respectively access A, B, C phase, secondary side one end respectively with AC-DC-friendship
Current converter is connected, and the other end of secondary side is connected to form Y type wiring.
The side no-load voltage ratio of coupling transformer first and second is 4：1.
Also include voltage detection unit, the voltage detection unit detects output phase voltage and the friendship of the second winding respectively
The output phase voltage of stream-direct-current-alternating-current converter, and controller is sent to, the controller control AC-DC-exchange becomes
The switch of switching device in parallel operation.
Using a kind of low-voltage network system of the flexible ULTC of three winding, the first winding connection
Power transmission network, the second winding connection power distribution network, the tertiary winding is connected in series to distribution through AC-DC-AC converter, coupling transformer
In net；
When voltage magnitude is relatively low in power distribution network, distribution is made by the output voltage for raising AC-DC-AC converter
Net voltage magnitude reaches rated value；When voltage magnitude is higher in power distribution network, by reducing AC-DC-AC converter
Output voltage makes distribution network voltage amplitude reach rated value.
The control method of the low-voltage network system, comprises the following steps：
The winding of step (1) first is connected with power transmission network, the second winding and tertiary winding output voltage, DC capacitor charging；
Step (2) is after setting time, and DC capacitor voltage is stable, starts controller and voltage detection unit；
Step (3) controller receives voltage detection signal and the output phase voltage to the second winding locks phase, calculates A phase phases
Parallactic angle instantaneous value φ；Calculate total reference voltage；Calculate AC-DC-AC converter reference voltage；
Step (4) AC-DC-AC converter reference voltage and the reality of the output of AC-DC-AC converter
Phase voltage relatively and send into adjuster calculate；Pulse width modulate wave PWM signal is generated, in AC-DC-AC converter
Switching device is controlled.
Adjuster in the step (4) is pi regulator.
Beneficial effects of the present invention：
1, it is quick to suppress active power distribution network multi-frequency yardstick voltage pulsation.
2, output voltage can be continuously adjusted, with non differential regulation characteristic.
3, it is reliable in the absence of mechanical action structure.
Brief description of the drawings
Fig. 1 is low-voltage network system of the invention；
Fig. 2 is control method of the invention；
Fig. 3 is control method flow chart of the invention；
Embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Using a kind of low-voltage network system of the flexible ULTC of three winding, including three-winding transformer, friendship
Stream-direct-current-alternating-current converter, coupling transformer, voltage detection unit, controller, overall structure diagram are as shown in Figure 1.
Three-winding transformer include the first winding, the second winding, the tertiary winding, the first winding use Y type wiring, second around
Group uses Y type wiring, and the tertiary winding uses triangular form wiring.It is 15%, three winding output voltage ratio to consider on-load voltage regulation scope
For 35/10/0.38kv, Capacity Ratio is 100/100/15.
The first winding (the first winding) of three-winding transformer is connected with power transmission network, the big second siding ring (second of capacity
Winding) it is connected with power distribution network, the small second siding ring of capacity (tertiary winding) is through AC-DC-AC converter, coupling transformation
Device is connected in series in power distribution network.
The AC-DC-AC converter part includes uncontrollable rectifier device part, DC capacitor, inverter section.No
The alternating current that control rectification is used for exporting the tertiary winding is changed into direct current and is output to electric capacity, including input filter inductance LD1,
LD2, LD3 diode D1, D2, D3, D4, D5, D6, uncontrollable rectifier is without additional control, and its operation principle is common knowledge.Direct current
Electric capacity is CS1, for storing direct current energy, stabilizing DC voltage fluctuation.Inverter section include gate-controlled switch device S1, S2,
S3, S4, S5, S6, output inductor LS1, LS2, LS3, wherein output filter capacitor CS1, CS2, CS3, switching device S1-S6
Switch motion by controller control.
The coupling transformer is TS1, TS2, TS3, and primary side is connected respectively accesses A, B, C phase, secondary side one end difference
It is connected with AC-DC-AC converter, the secondary side other end is connected to form the Y type modes of connection.Coupling transformer first and second
Side no-load voltage ratio is Ns：1, in order to ensure that the value that on-load voltage regulation scope is 15%, Ns is 4.
The voltage detection unit detects output phase voltage u2a, u2b, u2c and the AC-DC-friendship of the second winding respectively
Output phase voltage uca, ucb, ucc of current converter, and it is sent to controller.Specific voltage detection unit principle is known in the industry
General knowledge.
The controller is digital signal processor, the voltage detection signal that its receiving voltage detection unit is sent, output
End and switching device S1-S6, and control opening and turning off for S1-S6.Control algolithm in digitial controller is suitable for low pressure
The control method of the flexible ULTC of the three winding of power distribution network, specific method will introduce below.
Control method using a kind of low-voltage network system of the flexible ULTC of three winding mainly includes electricity
Press phase-lock technique, it is total with reference to potentiometer calculate method, AC-DC-AC converter reference voltage computational methods, pi regulator,
PWM makers, its schematic diagram is as shown in Figure 2.
The output voltage A phases phase angle that voltage phase-lock technique calculates the second winding according to voltage u2a, u2b, u2c is instantaneous
Value φ, its circular is common knowledge in the industry.
Total reference voltage generating algorithm is formula (1)：
Wherein, ua*, ub*, uc* are total reference voltage level, and U is rated voltage peak value 10kV.
AC-DC-AC converter reference voltage computational methods are formula (2)：
Wherein, uca*, ucb*, ucc* are AC-DC-AC converter reference voltage level.
Pi regulator can be by uca*, ucb*, ucc* and uca, ucb, and the difference control between ucc is 0, it is ensured that exchange-straight
Output voltage uca, ucb, ucc and the uca* of stream-AC converter, ucb*, ucc* is identical, and then ensures the electricity of access power distribution network
Pressure is identical with rated voltage.
PWM makers are compared the output of pi regulator with triangular carrier, and export to control S1-S6 control to believe
Number.Its concrete principle is common knowledge.
Using a kind of control method of the low-voltage network system of the flexible ULTC of three winding, including following step
Suddenly：
(1) winding of three-winding transformer first is connected with power transmission network, the second winding, tertiary winding output voltage, electric capacity CS1
Charging.
(2) 1s is passed through, capacitance voltage is stable, starts controller, voltage detection unit.
(3) controller receives voltage detection signal and locks phase to u2a, u2b, u2c, calculates A phases phase angle instantaneous value φ.
(4) total reference voltage ua*, ub*, uc* are calculated.
(5) AC-DC-AC converter reference voltage uca*, ucb*, ucc* is calculated.
(6) reference voltage uca*, ucb*, ucc* and virtual voltage uca, ucb, ucc relatively and send into pi regulator and fallen into a trap
Calculate.
(7) Pulse width modulate wave PWM signal is generated.
(8) repeat step (2) arrives (7).
Step is as described in the flow chart of figure 3.
When voltage magnitude is relatively low in power distribution network, distribution is made by the output voltage for raising AC-DC-AC converter
Net voltage magnitude reaches rated value；When voltage magnitude is higher in power distribution network, by reducing AC-DC-AC converter
Output voltage makes distribution network voltage amplitude reach rated value.The device can adjust distribution network voltage amplitude in real time, can be to one
The voltage magnitude fluctuation determined in scope carries out non differential regulation, and the on-load voltage regulation part of the device is mainly made up of semiconductor devices,
In the absence of mechanical action structure, fast response time is stable.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deform still within protection scope of the present invention that creative work can make.
Claims (10)
1. a kind of flexible ULTC of three winding, it is characterized in that, including the winding of first winding first, secondary winding second
Winding and the secondary winding tertiary winding, wherein the capacity of second winding is more than the tertiary winding；The tertiary winding according to
Secondary connection AC-DC-AC converter and coupling transformer.
2. the flexible ULTC of a kind of three winding as claimed in claim 1, it is characterized in that, first winding uses Y
Type wiring, the second winding uses Y type wiring, and the tertiary winding uses triangular form wiring.
3. the flexible ULTC of a kind of three winding as claimed in claim 1, it is characterized in that, the output voltage of three windings
Than for 35/10/0.38kv, Capacity Ratio is 100/100/15.
4. the flexible ULTC of a kind of three winding as claimed in claim 1, it is characterized in that, the AC-DC-exchange
Converter includes uncontrollable rectifier device part, DC capacitor and the inverter section being sequentially connected；Uncontrollable rectifier be used for by the 3rd around
The alternating current of group output is changed into direct current；DC capacitor is used for storing direct current energy, stabilizing DC voltage fluctuation；Inverter section
It is alternating current by DC inverter.
5. the flexible ULTC of a kind of three winding as claimed in claim 4, it is characterized in that, the coupling transformer is once
Side is connected respectively accesses A, B, C phase, and secondary side one end is connected with AC-DC-AC converter respectively, the other end of secondary side
It is connected to form Y type wiring.
6. the flexible ULTC of a kind of three winding as claimed in claim 5, it is characterized in that, the coupling transformer one,
Secondary side no-load voltage ratio is 4：1.
7. the flexible ULTC of a kind of three winding as claimed in claim 4, it is characterized in that, in addition to voltage detecting list
Member, the voltage detection unit detects the output phase voltage of the second winding and the output phase of AC-DC-AC converter respectively
Voltage, and the switch for the switching device being sent in controller, the controller control AC-DC-AC converter.
8. using a kind of low-voltage network system of the flexible ULTC of three winding described in claim 7, it is characterized in that,
First winding connects power transmission network, and the second winding connects power distribution network, and the tertiary winding is through AC-DC-AC converter, coupling
Transformer series are into power distribution network；
When voltage magnitude is relatively low in power distribution network, make power distribution network electricity by raising the output voltage of AC-DC-AC converter
Pressure amplitude value reaches rated value；When voltage magnitude is higher in power distribution network, by the output for reducing AC-DC-AC converter
Voltage makes distribution network voltage amplitude reach rated value.
9. the control method of low-voltage network system described in claim 8, it is characterized in that, comprise the following steps：
The winding of step (1) first is connected with power transmission network, the second winding and tertiary winding output voltage, DC capacitor charging；
Step (2) is after setting time, and DC capacitor voltage is stable, starts controller and voltage detection unit；
Step (3) controller receives voltage detection signal and the output phase voltage to the second winding locks phase, calculates A phases phase angle
Instantaneous value φ；Calculate total reference voltage；Calculate AC-DC-AC converter reference voltage；
Step (4) AC-DC-AC converter reference voltage and the actual phase electricity of the output of AC-DC-AC converter
Pressure ratio relatively and send into adjuster calculate；Pulse width modulate wave PWM signal is generated, to the switch in AC-DC-AC converter
Device is controlled.
10. the control method of low-voltage network system as claimed in claim 9, it is characterized in that, the adjuster in the step (4)
For pi regulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710358011.0A CN106997804A (en) | 2017-05-19 | 2017-05-19 | Three winding flexibility ULTC, low-voltage network system and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710358011.0A CN106997804A (en) | 2017-05-19 | 2017-05-19 | Three winding flexibility ULTC, low-voltage network system and control method |
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| Publication Number | Publication Date |
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| CN106997804A true CN106997804A (en) | 2017-08-01 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710358011.0A Pending CN106997804A (en) | 2017-05-19 | 2017-05-19 | Three winding flexibility ULTC, low-voltage network system and control method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5808452A (en) * | 1997-09-15 | 1998-09-15 | Gyugyi; Laszlo | Power flow controller with dc-to-dc converter linking shunt and series connected inverters |
| US20010030122A1 (en) * | 2000-02-14 | 2001-10-18 | Shoji Hara | Laminate comprising polyimide and conductor layer, multi-layer wiring board with the use of the same and process for producing the same |
| CN101615492A (en) * | 2009-04-28 | 2009-12-30 | 深圳市库马克新技术股份有限公司 | Three-winding transformer and variable-frequency speed-regulation power supply system |
| CN104198853A (en) * | 2014-08-27 | 2014-12-10 | 江苏科技大学 | Wind power grid integration testing device and testing method |
| CN205141697U (en) * | 2015-06-05 | 2016-04-06 | 江苏同芯电气科技有限公司 | Scene integration high -power topological structure of converter system that is incorporated into power networks |
| CN105703380A (en) * | 2016-04-19 | 2016-06-22 | 北京英博电气股份有限公司 | Low voltage control device for rural power grid |
| CN206711728U (en) * | 2017-05-19 | 2017-12-05 | 国网山东省电力公司莱芜供电公司 | Three winding flexibility ULTC and low-voltage network system |
-
2017
- 2017-05-19 CN CN201710358011.0A patent/CN106997804A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5808452A (en) * | 1997-09-15 | 1998-09-15 | Gyugyi; Laszlo | Power flow controller with dc-to-dc converter linking shunt and series connected inverters |
| US20010030122A1 (en) * | 2000-02-14 | 2001-10-18 | Shoji Hara | Laminate comprising polyimide and conductor layer, multi-layer wiring board with the use of the same and process for producing the same |
| CN101615492A (en) * | 2009-04-28 | 2009-12-30 | 深圳市库马克新技术股份有限公司 | Three-winding transformer and variable-frequency speed-regulation power supply system |
| CN104198853A (en) * | 2014-08-27 | 2014-12-10 | 江苏科技大学 | Wind power grid integration testing device and testing method |
| CN205141697U (en) * | 2015-06-05 | 2016-04-06 | 江苏同芯电气科技有限公司 | Scene integration high -power topological structure of converter system that is incorporated into power networks |
| CN105703380A (en) * | 2016-04-19 | 2016-06-22 | 北京英博电气股份有限公司 | Low voltage control device for rural power grid |
| CN206711728U (en) * | 2017-05-19 | 2017-12-05 | 国网山东省电力公司莱芜供电公司 | Three winding flexibility ULTC and low-voltage network system |
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