CN104037702A - Direct-current deicing and SVG (static var compensator) device with uncontrollable rectification units and fully-controlled rectification units connected in series - Google Patents
Direct-current deicing and SVG (static var compensator) device with uncontrollable rectification units and fully-controlled rectification units connected in series Download PDFInfo
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- 230000010363 phase shift Effects 0.000 claims abstract description 31
- 230000008018 melting Effects 0.000 claims description 33
- 238000002844 melting Methods 0.000 claims description 33
- 238000006243 chemical reaction Methods 0.000 claims description 5
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- 230000006870 function Effects 0.000 description 5
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- 230000004308 accommodation Effects 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
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Abstract
The invention discloses a direct-current deicing and SVG (static var compensator) device with uncontrollable rectification units and fully-controlled rectification units connected in series. The direct-current deicing and SVG device comprises net-side high-voltage circuit breakers, multi-winding phase-shift step-down transformers and a current converter, wherein primary sides of the multi-winding phase-shift step-down transformers are connected with a power network via the net-side high-voltage circuit breakers, secondary sides of the multi-winding phase-shift step-down transformers are connected with the current converter, an output end of the current converter is connected with an overhead line of the power grid, the current converter is formed by at least one fully-controlled rectification unit and at least one uncontrollable rectification unit, input ends of the fully-controlled rectification units and the uncontrollable rectification units are connected with secondary-side independent windings of the corresponding multi-winding phase-shift step-down transformers via low-voltage circuit breakers, and output ends of the fully-controlled rectification units and the uncontrollable rectification units are connected in series sequentially. The direct-current deicing and SVG device is convenient to operate and maintain, strong in practicability, high in efficiency and low in price.
Description
Technical field
The present invention relates to a kind of DC ice melting SVG device of holding concurrently, is a kind of control and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently specifically.
Background technology
The low-temperature freezing rain and snow disaster occurring at the beginning of China 2008, causes the most areas electrical network facilities in south electric network region to be subjected to heavy damage, and transferring electricity from the west to the east is also had a strong impact on.For improving the defensive ability/resistance ability of electrical network to extreme climate, major natural disasters, south electric network has started " DC de-icing device prototype design " project, has opened the beginning in domestic this field.Along with the deterioration of environment, exceedingly odious weather happens occasionally, and research and develop a kind of simple and practical DC de-icing device of economy again still has realistic meaning very much.
DC ice melting principle is using icing circuit as load, and it is applied to DC ice melting power supply, and wherein DC ice melting power acquisition provides short circuit current to heat icing circuit by low voltage, and then icing is melted.And current DC ice melting power supply only has ice-melt function,, there is the shortcoming of function singleness in competence exertion effect in special time that just can be in the winter time, and this shortcoming causes its cost performance lower simultaneously, makes it not possess good engineering application prospect.
For this reason, Chinese invention patent application CN 102761085 A, a kind of DC ice melting electric source topology is disclosed, it comprises the first net side primary cut-out, the second net side primary cut-out, many windings phase shift step-down transformer, current transformer and isolating switch module, current transformer is the many level current transformers of chain type, by the switching of two primary cut-outs and isolating switch, realize the conversion of DC ice melting and SVG function, but there is following defect in this DC ice melting power supply: (1) topological structure is complicated, complex operation, switching between DC ice melting and no-power compensation function, need to just can complete the conversion of topological structure through a plurality of switching manipulations, (2) output dc voltage adjustable extent is little, must more than the direct voltage that meets controlled rectification condition, regulate, and cannot effectively adapt to the transmission line of different length, (3) the capacity of SVG and DC ice melting capacity can not be according to the actual demand proportional arrangement of transformer station, (4) device volume is huge, transports extremely inconvenient, (5) for the DC de-icing device of simple function, overwhelming majority times (circuit does not need ice-melt) is in idle state, and the utilance of device is low, must check comprehensively and test before dropping into ice-melt, otherwise its security of operation, reliability is difficult to guarantee.
Summary of the invention
Technical problem underlying to be solved by this invention is: how realizing direct voltage size can regulate; While not needing ice-melt, how to reach the object of reactive power compensation, thereby have SVG function concurrently, and then increase operation rate; How to realize that more convenient operation, practicality are stronger, efficiency is higher, safeguard more convenient and price is cheaper.
The technical scheme that the present invention solves above technical problem is:
Not a kind of control and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently, comprise: net side primary cut-out, many windings phase shift step-down transformer and current transformer, the former limit of many windings phase shift step-down transformer connects electrical network by net side primary cut-out, the inferior limit winding of many windings phase shift step-down transformer connects current transformer, and the output of current transformer connects the overhead wire of electrical network; Current transformer is comprised of at least one full-controlled rectifier unit and at least one uncontrollable rectification unit, the input of full-controlled rectifier unit and uncontrollable rectification unit is connected with the inferior limit independent winding of corresponding many windings phase shift step-down transformer through low-voltage circuit breaker respectively, and the output of full-controlled rectifier unit and uncontrollable rectification unit is connected successively.
Like this, the hold concurrently direct voltage size of SVG device of DC ice melting provided by the invention can regulate, thereby by the low-voltage circuit breaker of deciliter each unit, changes the series winding quantity of unit; Also can be by regulating the direct voltage of full-controlled rectifier unit to finely tune, the 0-15% that the amplitude of accommodation is this cells rated voltage.When needs ice-melt, the direct voltage of output is applied to and freezes on electrical network, utilizes large electric current to make the principle of overhead wire heating realize ice-melt; When not needing ice-melt, by the full-controlled rectifier unit of IGBT module composition sending perception or capacitive reactive power electric current to electrical network according to instruction, reach the object of reactive power compensation, make this DC de-icing device have SVG function concurrently, thereby improved the utilance of device.
As can be seen here, while carrying out ice-melt, according to the sectional area of overhead wire and length, determine the output dc voltage value of current transformer, thereby determine the quantity of the rectifier of series connection, by not controlling to cut to throw with the divide-shut brake of the input contactor (circuit breaker) of full-controlled rectifier unit, use; During not ice-melt, electrical network is done electric network reactive compensation use under normal circumstances, and the three-phase four-quadrant full-controlled rectifier device consisting of IGBT sends perception or capacitive reactive power electric current according to instruction to electrical network, reaches the object of reactive power compensation; Utilize simple line construction can obtain the effect of killing two birds with one stone.
The technical scheme that the present invention further limits is:
Not aforesaid control and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently, wherein full-controlled rectifier unit is three phase controlled rectifier circuit, its ac input end is connected with low-voltage circuit breaker through three-phase LC filter, three phase controlled rectifier circuit is comprised of A phase IGBT module, B phase IGBT module and C phase IGBT module, the IGBT module of each phase forms by two power tubes, the DC output end of A phase IGBT module, B phase IGBT module and C phase IGBT module is in parallel, as the direct current output of full-controlled rectifier unit.
Aforesaid control and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently, wherein the DC output end of three phase controlled rectifier circuit is connected to electric capacity, for maintaining the stable and DC filtering of busbar voltage.
Not aforesaid control and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently, wherein uncontrollable rectification unit is three-phase diode rectifier bridge, the three-phase dc output of three-phase diode rectifier bridge is in parallel, as the direct current output of three-phase diode rectifier bridge.
Aforesaid control and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently, wherein the former limit winding of many windings phase shift step-down transformer adopts Y-connection mode or Angle connection mode.
Aforesaid control and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently, wherein the inferior limit winding of many windings phase shift step-down transformer adopts Angle connection mode.
Aforesaid control and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently, wherein the electric pressure of net side primary cut-out, according to transformer station's builtin voltage classification, is 7.2kV, 12kV or 40.5kV.
Aforesaid control and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently, wherein net side primary cut-out is connected in electrical network, utilizes the divide-shut brake of net side primary cut-out can realize the long-range divide-shut brake of this device.
Not aforesaid control and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently, wherein the output of net side primary cut-out connects many windings phase shift step-down transformer, many windings phase shift step-down transformer is used as voltage matches, input high pressure is dropped to low pressure, the inferior limit winding output of many windings phase shift step-down transformer connects full-controlled rectifier unit and uncontrollable rectification unit, full-controlled rectifier unit becomes direct voltage with uncontrollable rectification unit by AC voltage conversion, and the DC output end of full-controlled rectifier unit and uncontrollable rectification unit is together in series successively, final output dc voltage is the voltage that is added in overhead wire.
The invention has the beneficial effects as follows: (1) system is simple, Operation and Maintenance is strong, adopts the design of blocking, and single rectification unit breaks down does not affect the use of whole equipment; (2) practical, can meet the different demands of client, in Ke Dui transformer station, the circuit of all different electric pressures carries out ice-melt work; While carrying out ice-melt, according to the sectional area of overhead wire and length, determine the output dc voltage value of current transformer, thereby determine the quantity of the rectifier of series connection, by not controlling to cut to throw with the divide-shut brake of the input contactor (circuit breaker) of full-controlled rectifier unit, use, cut throwing speed fast, ice-melt workload is little; (3) the capacity of SVG and DC ice melting capacity can be according to the actual demand proportional arrangement of transformer station; (4) during not ice-melt, electrical network is done electric network reactive compensation use under normal circumstances, and the utilance of equipment is high, and the three-phase four-quadrant full-controlled rectifier device consisting of IGBT sends perception or capacitive reactive power electric current according to instruction to electrical network, reaches the object of reactive power compensation; (5) on the basis of implementing SVG application, add ice-melt function, small investment, effect is large; (6) because this device can be used as SVG at ordinary times to be used always, in case of emergency, equipment can directly drop into ice-melt and use, thereby has greatly reduced overhaul of the equipments workload and expense before using.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present invention.
Fig. 2 is the circuit theory diagrams of full-controlled rectifier of the present invention unit.
Fig. 3 is the circuit theory diagrams of uncontrollable rectification unit of the present invention.
Embodiment
embodiment 1
The present embodiment provides a kind of and does not control and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently, schematic block circuit diagram as shown in Figure 1, comprise: net side primary cut-out QF, many windings phase shift step-down transformer TM1 and current transformer, the former limit of many windings phase shift step-down transformer TM1 connects electrical network by net side primary cut-out QF, the inferior limit winding of many windings phase shift step-down transformer TM1 connects current transformer, the output of current transformer connects the overhead wire of electrical network, current transformer is comprised of some full-controlled rectifiers unit and some uncontrollable rectification units, the input of full-controlled rectifier unit and uncontrollable rectification unit respectively through the 1st to n low-voltage circuit breaker QF1 to QFn, connect with the inferior limit independent winding of corresponding many windings phase shift step-down transformer TM1, the output of full-controlled rectifier unit and uncontrollable rectification unit is connected successively, form direct current output loop, direct current output as this device.In this example, the former limit winding of many windings phase shift step-down transformer TM1 adopts Y-connection mode, in addition, can also adopt Angle connection mode; The inferior limit winding of many windings phase shift step-down transformer TM1 adopts Angle connection mode.
As shown in Figure 2: the full-controlled rectifier unit in the present embodiment is three phase controlled rectifier circuit, its ac input end is connected with low-voltage circuit breaker QF1 through three-phase LC filter (consisting of with three pole reactor L1 three phase capacitance C1), three phase controlled rectifier circuit is by A phase IGBT module UA1, B phase IGBT module UB1, C phase IGBT module UC1 forms, the IGBT module of each phase forms by two power tubes, A phase IGBT module UA1, B phase IGBT module UB1, the DC output end of C phase IGBT module UC1 is in parallel, direct current output as full-controlled rectifier unit, the DC output end of three phase controlled rectifier circuit is connected to capacitor C 0.Capacitor C 0 plays the stable and DC filtering effect of busbar voltage that maintains.
As shown in Figure 3: in the present embodiment, uncontrollable rectification unit is three-phase diode rectifier bridge, the three-phase dc output of three-phase diode rectifier bridge is in parallel, as the direct current output of three-phase diode rectifier bridge.In figure, UAn is A diode phase, and UBn is B diode phase, and UCn is C diode phase.
The electric pressure of net side primary cut-out QF can, according to transformer station's builtin voltage classification, can be 7.2kV, 12kV or 40.5kV etc.Net side primary cut-out QF is connected in electrical network, utilizes the divide-shut brake of net side primary cut-out QF can realize apparatus remote and divides/close a floodgate.The output of net side primary cut-out QF meets many windings phase shift step-down transformer TM1, and many windings phase shift step-down transformer TM1 is used as voltage matches, and input high pressure is dropped to low pressure, and winding output in inferior limit connects full-controlled rectifier unit and uncontrollable rectification unit.Full-controlled rectifier unit becomes direct voltage with uncontrollable rectification unit by AC voltage conversion, and the DC output end of full-controlled rectifier unit and uncontrollable rectification unit is together in series successively, and final output dc voltage is the voltage that is added in overhead wire.
In addition to the implementation, the present invention can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of requirement of the present invention.
Claims (9)
1. do not control and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently for one kind, comprise: net side primary cut-out, many windings phase shift step-down transformer and current transformer, the former limit of described many windings phase shift step-down transformer connects electrical network by described net side primary cut-out, the inferior limit winding of described many windings phase shift step-down transformer connects described current transformer, and the output of described current transformer connects the overhead wire of electrical network; It is characterized in that: described current transformer is comprised of at least one full-controlled rectifier unit and at least one uncontrollable rectification unit, the input of described full-controlled rectifier unit and uncontrollable rectification unit is connected with the inferior limit independent winding of corresponding many windings phase shift step-down transformer through low-voltage circuit breaker respectively, the output of described full-controlled rectifier unit and uncontrollable rectification unit is connected successively, forms direct current output loop as the direct current output of this device.
2. not as claimed in claim 1 control and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently, it is characterized in that: described full-controlled rectifier unit is three phase controlled rectifier circuit, its ac input end is connected with low-voltage circuit breaker through three-phase LC filter, described three phase controlled rectifier circuit is comprised of A phase IGBT module, B phase IGBT module and C phase IGBT module, the IGBT module of each phase forms by two power tubes, the DC output end of A phase IGBT module, B phase IGBT module and C phase IGBT module is in parallel, as the direct current output of described full-controlled rectifier unit.
3. as claimed in claim 2 control and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently, is characterized in that: the DC output end of described three phase controlled rectifier circuit is connected to electric capacity, for maintaining the stable and DC filtering of busbar voltage.
4. not as claimed in claim 1 control and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently, it is characterized in that: described uncontrollable rectification unit is three-phase diode rectifier bridge, the three-phase dc output of described three-phase diode rectifier bridge is in parallel, as the direct current output of three-phase diode rectifier bridge.
5. not controlling and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently as described in arbitrary claim in claim 1-4, is characterized in that: the former limit winding of described many windings phase shift step-down transformer adopts Y-connection mode or Angle connection mode.
6. not controlling and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently as described in arbitrary claim in claim 1-4, is characterized in that: the inferior limit winding of described many windings phase shift step-down transformer adopts Angle connection mode.
7. not controlling and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently as described in arbitrary claim in claim 1-4, it is characterized in that: the electric pressure of described net side primary cut-out, according to transformer station's builtin voltage classification, is 7.2kV, 12kV or 40.5kV.
8. not controlling and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently as described in arbitrary claim in claim 1-4, it is characterized in that: described net side primary cut-out is connected in electrical network, utilize the divide-shut brake of net side primary cut-out to realize the long-range divide-shut brake of this device.
9. not controlling and the DC ice melting of the full-controlled rectifier cell string SVG device of holding concurrently as described in arbitrary claim in claim 1-4, it is characterized in that: the output of described net side primary cut-out connects many windings phase shift step-down transformer, many windings phase shift step-down transformer is used as voltage matches, input high pressure is dropped to low pressure, the inferior limit winding output of many windings phase shift step-down transformer connects full-controlled rectifier unit and uncontrollable rectification unit, full-controlled rectifier unit becomes direct voltage with uncontrollable rectification unit by AC voltage conversion, and the DC output end of full-controlled rectifier unit and uncontrollable rectification unit is together in series successively, final output dc voltage is the voltage that is added in overhead wire.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410283153.1A CN104037702A (en) | 2014-06-23 | 2014-06-23 | Direct-current deicing and SVG (static var compensator) device with uncontrollable rectification units and fully-controlled rectification units connected in series |
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| CN201410283153.1A CN104037702A (en) | 2014-06-23 | 2014-06-23 | Direct-current deicing and SVG (static var compensator) device with uncontrollable rectification units and fully-controlled rectification units connected in series |
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Cited By (5)
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| CN104836463A (en) * | 2015-04-30 | 2015-08-12 | 华南理工大学 | Mixing transformation system based on three-phase PWM rectification and multi-unit uncontrolled rectification |
| CN105141170A (en) * | 2015-09-18 | 2015-12-09 | 江苏同芯电气科技有限公司 | Long pulse large power high voltage power supply |
| CN106487250A (en) * | 2016-11-11 | 2017-03-08 | 温州任和教育科技有限责任公司 | Electric power tower |
| CN108777468A (en) * | 2018-06-22 | 2018-11-09 | 国网湖南省电力有限公司 | A kind of multi-functional intensive DC de-icing device |
| CN109873568A (en) * | 2019-02-19 | 2019-06-11 | 南京南瑞继保电气有限公司 | A kind of more DC port inverters and control method |
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Address after: 212211 Jiangsu city of Zhenjiang Province South Road Yangzhong City New Technology Park No. 1 Applicant after: Zhou Xiwen Applicant after: Jiangsu Uonone New Energy Co., Ltd. Address before: 411100, No. 2, unit 19, Cemetery Road, Yuhu District, Hunan, Xiangtan, 4 Applicant before: Zhou Xiwen Applicant before: Jiangsu Uonone New Energy Co., Ltd. |
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Application publication date: 20140910 |