CN103078287A - Direct-current high-current ice-melting device with STATCOM function - Google Patents
Direct-current high-current ice-melting device with STATCOM function Download PDFInfo
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- CN103078287A CN103078287A CN2013100334949A CN201310033494A CN103078287A CN 103078287 A CN103078287 A CN 103078287A CN 2013100334949 A CN2013100334949 A CN 2013100334949A CN 201310033494 A CN201310033494 A CN 201310033494A CN 103078287 A CN103078287 A CN 103078287A
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Abstract
The invention belongs to the technical field of the high-voltage power transmission and distribution system, in particular relates to a direct-current high-current ice-melting device with a STATCOM function. The direct-current high-current ice-melting device with the STATCOM function is characterized by comprising two STATCOMs with same circuit configurations and one ice-melting commutation switch matrix, wherein one ends of the two STATCOMs are connected with a three phase alternating-current buses, the other ends of the two STATCOMs are connected with the ice-melting commutation switch matrix, the ice-melting commutation switch matrix is composed of six isolation switches which are matched with the two STATCOMs and are divided into two groups correspondingly, and two ends of each group of the isolation switches are respectively connected with the STATCOMs and an A phase, a B phase and a C phase of a line to be de-iced. According to the direct-current high-current ice-melting device with the STATCOM function, disclosed by the invention, a large number of passive filters based on capacitors and electric reactors is not required to be arranged at an alternating-current side, therefore the floor space of the whole device is greatly reduced, no pulse width modulation technology is needed, the switching loss of an IGBT (Insulated Gate Bipolar Translator) is reduced, and the output current is enhanced.
Description
Technical field
The invention belongs to high pressure electrical power trans mission/distribution system device technique field, be specifically related to a kind of DC great current deicing apparatus of the STATCOM of having function.
Background technology
At present, because transmission line freezes and accumulated snow causes the high voltage transmission line broken string and falls tower, the accident of bar of falling and happens occasionally, ultra-high-tension power transmission line broken string and the accident of falling the tower have had a strong impact on the safe operation of electrical network, cause large area blackout.In order to prevent the generation of this class accident, must in time freezing on the wire be melted with accumulated snow, mainly take at present the de-icing method of machinery (vibration) formula, electrothermal two large classes.The ice-melt of machinery (vibration) formula, namely adopt the method for vibration wire that ice and snow is come off, its characteristics are simple operations, need not to waste electric energy, but its shortcoming is to be undertaken by shelves, speed is slow, and in the situation that ground freezes and accumulated snow is serious, often can not arrive the transmission line on the high mountain because of traffic problems and can't operate.The electrothermal ice melting technology, namely utilize the large electric current that the line end short circuit is produced wire-heated to be reached the purpose of ice-melt, compare with machinery (vibration) formula de-icing method, the advantage of electrothermal ice melting technology is the ice-melt speed, be not subjected to icy on road and impact accumulated snow, but need expend certain electric energy corollary apparatus relevant with configuration.Generally adopt now the electrothermal ice melting technology that AC great current de-icing technology and DC great current deicing technology are arranged, comparatively speaking, the advantage of AC great current de-icing technology is that all there is the AC power of different electric pressures in each electric substation, therefore the power supply ratio is easier to obtain, its shortcoming is under identical ice melting current, need higher supply voltage, because the interchange induction reactance of general transmission line is more much bigger than its resistance, thereby ice-melt needs very large power supply capacity and very large reactive power, larger to system shock during ice-melt, may cause the system voltage stability problem; Another shortcoming is because the voltage of its AC power is non-adjustable, so ice melting current cannot be controlled.The advantage of DC great current deicing technology is under identical ice melting current, only needs lower supply voltage, because the direct current induction reactance of transmission line is 0, so very little to system shock during ice-melt; Its shortcoming is to need to be equipped with in addition rectification and filter, and because the phenomenon that circuit seriously freezes is uncommon, the utilance of these devices is lower.Patent 200810060026.X and 200810120372.2 discloses the device that two classes can combine DC great current deicing technology and static reactive power compensation technology (SVC), effectively improved utilization rate of equipment and installations, therefore but all need to configure a large amount of passive filters based on capacitor and reactor in the two class devices of foregoing invention, have that floor space is large, reactive power changes problems such as greatly, easily producing harmonic resonance during ice-melt.Patent 201110362882.2 discloses a kind of difunctional DC de-icing device based on the voltage-source type converter, this contrive equipment combines ice-melt function and STATCOM function, but, there are 4 aspect shortcomings in this invention: 1) this device needs a step-down transformer, has increased loss and cost; 2) because this device adopts pulse-width modulation (PWM) technology, IGBT switching loss and electromagnetic interference have been increased; Reduced the ability of output current; 3) because this device adopts pulse-width modulation (PWM) technology, need to install filter additional at AC; 4) because the restriction of circuit structure, the direct voltage adjustable extent of this contrive equipment is little, thereby require all by the same length of ice-thawing electric transmission line, but often the length of the transmission line of a transformer station is not roughly the same, so this contrive equipment can not carry out ice-melt to all transmission lines of transformer station.
Summary of the invention
For problems of the prior art, the object of the present invention is to provide a kind of technical scheme of DC great current deicing apparatus of the STATCOM of having function.
Described DC great current deicing apparatus with STATCOM function, it is characterized in that: STATCOM and an ice-melt commutation disconnecting link matrix by two circuit topologies and the identical chain structure of parameter consist of, two STATCOM one ends link to each other with the three-phase alternating current bus, two STATCOM other ends link to each other with ice-melt commutation disconnecting link matrix, ice-melt commutation disconnecting link matrix is comprised of six isolation switchs, six isolation switchs match with two STATCOM and correspondingly are divided into two groups, and the two ends of each group isolation switch connect respectively STATCOM and the A that treats DC ice-melting mutually, the B phase, the C phase.
Described DC great current deicing apparatus with STATCOM function, each circuitry phase that it is characterized in that described STATCOM by the full-bridge circuit cascade of several direct current side joint capacitors after and an AC reactor series connection consist of, AC reactor is connected on input or the output of circuit.
Described DC great current deicing apparatus with STATCOM function, each circuitry phase that it is characterized in that described STATCOM by the full-bridge circuit cascade of several direct current side joint capacitors after and two AC reactor series connection consist of, two AC reactor are connected on respectively input and the output of circuit.
Described DC great current deicing apparatus with STATCOM function, the full-bridge circuit that it is characterized in that described direct current side joint capacitor is made of four IGBT with anti-paralleled diode, a direct current capacitor, a contactor, four IGBT with anti-paralleled diode consist of a full-bridge circuit, direct current capacitor is connected on the DC side of this full-bridge circuit, and contactor is attempted by the interchange input side of this full-bridge circuit.
Described DC great current deicing apparatus with STATCOM function, it is characterized in that: during ice-melt, two STATCOM all adopt the star-star connection mode, the neutral point of one of them STATCOM is connected positive pole and is connected with ice-melt commutation disconnecting link matrix, the neutral point of another STATCOM is connected negative pole and is connected with ice-melt commutation disconnecting link matrix, the neutral point voltage that controller is controlled its anodal STATCOM raises gradually and is Udc/2, the neutral point voltage of negative pole STATCOM is reduced to-Udc/2 gradually, thereby so that just be connected on, the ice melting current value Idc=Udc/R that is risen to gradually setting by the direct current on the ice-melt wire of negative pole, wherein, R is by the resistance of ice-melt wire, Idc is ice-melt direct current set point, and Udc=Udc/2-(Udc/2) is the output dc voltage of DC ice melting power supply.
Described DC great current deicing apparatus with STATCOM function, it is characterized in that: when DC great current deicing apparatus is operated in the STATCOM state, all isolation switchs in the ice-melt commutation disconnecting link matrix all are shown in an open position, DC great current deicing apparatus just becomes two independently STATCOM, the mode of connection of STATCOM can enough star-star connection modes, also can enough delta connection modes; Two STATCOM can be connected on the same ac bus, also can be connected on two different ac bus; Two STATCOM can move simultaneously, also can isolated operation.
The present invention is made of STATCOM and an ice-melt commutation disconnecting link matrix of two circuit topologies and the identical chain structure of parameter, and wherein 2 STATCOM consist of an output dc voltage adjustable DC ice melting power supply on a large scale.The Main Function of ice-melt commutation disconnecting link matrix is neatly the DC ice melting power supply to be received on the different phase conductors for the treatment of ice-thawing electric transmission line.During ice-melt, two STATCOM all adopt the star-star connection mode, the neutral point of one of them STATCOM is connected positive pole as the positive pole of DC ice melting power supply and is connected with ice-melt commutation disconnecting link matrix, the neutral point of another STATCOM is connected negative pole as the negative pole of DC ice melting power supply and is connected with ice-melt commutation disconnecting link matrix.Because the reason of ice-melt commutation disconnecting link matrix, ice-melt mode is very flexible, can carry out ice-melt to the integrated mode of various different phase conductors.
Because the quantity of device circuit cascade full-bridge circuit is more, even the output voltage of each full-bridge circuit is not very high (limited by the IGBT device withstand voltage), but the amplitude of the AC output voltage of whole cascade full-bridge circuit can reach higher value, so this device can not need transformer just can be directly connected to electric pressure common in the electrical network (such as 35KV, 10KV); And the voltage waveform of its AC output can adopt the nearest level of staircase waveform to approach modulation technique and approach very much sinusoidal wave, thereby no matter device is operated in ice-melt state or STATCOM state, ac-side current and the voltage harmonic content of device are very low, therefore device of the present invention need to not configure a large amount of passive filters based on capacitor and reactor at AC, thereby greatly reduces the floor space of whole device.And because this device do not need to adopt pulse-width modulation (PWM) technology, the switching loss of IGBT can reduce, and output current can improve, and can reduce the electromagnetic interference of other equipment in the transformer station.
Description of drawings
Fig. 1 is integrated circuit structural representation of the present invention;
Fig. 2 is the electrical block diagram one of the every phase of ice-melt DC power supply of the present invention;
Fig. 3 is the electrical block diagram two of the every phase of ice-melt DC power supply of the present invention;
Fig. 4 is the electrical block diagram three of the every phase of ice-melt DC power supply of the present invention;
Fig. 5 is the full-bridge circuit structural representation of direct current side joint capacitor of the present invention;
Among the figure: 1-STATCOM, 2-ice-melt commutation disconnecting link matrix, the 3-full-bridge circuit, the 4-AC reactor, 5-is with the IGBT of anti-paralleled diode, 6-direct current capacitor, 7-contactor.
Embodiment
The invention will be further described below in conjunction with Figure of description:
DC great current deicing apparatus with STATCOM function, STATCOM1 and an ice-melt commutation disconnecting link matrix 2 by two identical chain structures of topological sum parameter consist of, two STATCOM1 one ends link to each other with the three-phase alternating current bus, the other end links to each other with ice-melt commutation disconnecting link matrix 2, ice-melt commutation disconnecting link matrix 2 is comprised of six isolation switchs, be isolation switch G1, isolation switch G2, isolation switch G3, isolation switch G4, isolation switch G5, isolation switch G6, six isolation switchs match with two STATCOM1 and correspondingly are divided into two groups, the two ends of each group isolation switch connect respectively STATCOM1 and the A that treats DC ice-melting mutually, the B phase, the C phase (is isolation switch G1, G2, the end of G3 all with the connection of being connected, an other end is received respectively the A that treats DC ice-melting, B, on the C three-phase; Other 3 all are connected the end of isolation switch G4, G5, G6 with negative pole, an other end is received respectively on the A, the B that treat DC ice-melting, the C three-phase).
Wherein each circuitry phase of STATCOM1 by full-bridge circuit 3 cascades of several direct current side joint capacitors after (chain structure) and 4 series connection of AC reactor consist of, AC reactor 4 is connected on input or the output of circuit; Also can be each circuitry phase of STATCOM by full-bridge circuit 3 cascades of several direct current side joint capacitors after and two AC reactor 4 series connection consist of, two AC reactor 4 are connected on respectively input and the output of circuit.The full-bridge circuit 3 of direct current side joint capacitor is made of four IGBT5 with anti-paralleled diode, a direct current capacitor 6, a contactor 7, four IGBT5 with anti-paralleled diode consist of a full-bridge circuit, direct current capacitor 6 is connected on the DC side of this full-bridge circuit, and contactor 7 is attempted by the interchange input side of this full-bridge circuit.
During ice-melt, two STATCOM1 all adopt the star-star connection mode, the positive pole that the neutral point of one of them STATCOM1 is connected with ice-melt commutation disconnecting link matrix connects, the negative pole that the neutral point of another STATCOM1 is connected with ice-melt commutation disconnecting link matrix connects, the neutral point voltage that controller is controlled its anodal STATCOM raises gradually and is Udc/2, the neutral point voltage of negative pole STATCOM is reduced to-Udc/2 gradually, thereby so that just be connected on, the ice melting current value Idc=Udc/R that is risen to gradually setting by the direct current on the ice-melt wire of negative pole, wherein, R is by the resistance of ice-melt wire, Idc is ice-melt direct current set point, and Udc=Udc/2-(Udc/2) is the output dc voltage of DC ice melting power supply.
When DC great current deicing apparatus is operated in the STATCOM state, all isolation switchs in the ice-melt commutation disconnecting link matrix 2 all are shown in an open position, DC great current deicing apparatus just becomes two independently STATCOM, the mode of connection of STATCOM1 can enough star-star connection modes, also can enough delta connection modes; Two STATCOM1 can be connected on the same ac bus, also can be connected on two different ac bus; Two STATCOM1 can move simultaneously, also can isolated operation.
The full-bridge circuit of direct current side joint capacitor, when normal operation, its contactor 7 is shown in an open position; When element fault occurring, its contactor 7 closures, this circuit is bypassed.
The full-bridge circuit of direct current side joint capacitor, when device was operated in the STATCOM state and is the star-star connection mode, wherein part contactor 7 was in the close position.
This device is comprised of STATCOM and an ice-melt commutation disconnecting link matrix of two circuit topologies and the identical chain structure of parameter.2 STATCOM wherein consist of an output dc voltage adjustable DC ice melting power supply on a large scale.The Main Function of ice-melt commutation disconnecting link matrix is neatly the DC ice melting power supply to be received on the different phase conductors for the treatment of ice-thawing electric transmission line.During ice-melt, two STATCOM all adopt the star-star connection mode, the neutral point of one of them STATCOM is connected positive pole as the positive pole of DC ice melting power supply and is connected with ice-melt commutation disconnecting link matrix, the neutral point of another STATCOM is connected negative pole as the negative pole of DC ice melting power supply and is connected with ice-melt commutation disconnecting link matrix.Because the reason of ice-melt commutation disconnecting link matrix, ice-melt mode is very flexible, can carry out ice-melt to the integrated mode of various different phase conductors.For example: when after needs are together in series to A phase conductor and B phase conductor, carrying out ice-melt (A+B ice-melt integrated mode), isolation switch G1 in the ice-melt commutation disconnecting link matrix and G5 are closed, all the other isolation switchs are all opened, and treat that A, the B of DC ice-melting offside (end) and C phase conductor short circuit get final product; After needs are to A phase conductor and the parallel connection of B phase conductor again with C phase conductor be together in series (A||B+C ice-melt integrated mode) when carrying out ice-melt, isolation switch G1, G2 in the ice-melt commutation disconnecting link matrix and G6 are closed, all the other isolation switchs are all opened, and treat that A, the B of DC ice-melting offside (end) and C phase conductor short circuit get final product.Similarly, other any ice-melt integrated modes all can realize the different conditions of isolation switch by 6 in the control ice-melt commutation disconnecting link matrix.
When apparatus of the present invention were operated in the ice-melt state, controller was controlled its anodal STATCOM(neutral point as the STATCOM of DC ice melting positive source) neutral point voltage be elevated to gradually (Udc/2); Negative pole STATCOM(neutral point is as the STATCOM of DC ice melting power cathode) neutral point voltage be reduced to gradually (Udc/2), thus so that be connected on the ice melting current value (Idc=Udc/R) that is risen to gradually setting by the direct current on the ice-melt wire of positive and negative electrode.In the above-mentioned formula, R is by the equivalent resistance of ice-melt wire, and Idc is ice-melt direct current set point, and Udc=Udc/2-(Udc/2) is the output dc voltage of DC ice melting power supply.When by the transmission line of ice-melt more in short-term, the resistance R of wire is smaller, the output dc voltage Udc of DC ice melting power supply is also just lower; When long by the transmission line of ice-melt, the resistance R of wire is larger, and the output dc voltage Udc of DC ice melting power supply is also just higher.A common deicing device need to carry out ice-melt to many transmission lines in the same transformer station, and the length of every transmission line is different, so the output dc voltage Udc of ice-melt DC power supply also needs to have a larger scope.This DC ice melting voltage U dc in a big way can realize by the neutral point voltage of 2 STATCOM in the adjusting device.And the control of the STATCOM neutral point voltage of star-star connection mode can realize by the output voltage of controlling every phase cascade full-bridge circuit.
When apparatus of the present invention were operated in the STATCOM state, all isolation switchs in the ice-melt commutation disconnecting link matrix all were shown in an open position.Apparatus of the present invention just become 2 independently STATCOM, these 2 independently STATCOM can be connected on the same ac bus, also can receive on two different ac bus.Just can control the every phase current that flows through STATCOM by the size of regulating the output voltage of every phase cascade full-bridge circuit among the STATCOM, thereby realize the continuous adjusting of STATCOM reactive power.When the output voltage of the cascade full-bridge circuit among the STATCOM during greater than the voltage on the ac bus, STATCOM is to system's output reactive power (capacitive reactive power); When the output voltage of the cascade full-bridge circuit among the STATCOM during less than the voltage on the ac bus, STATCOM is from system's absorbing reactive power (perception is idle).
Because the quantity of device circuit cascade full-bridge circuit is more, even the output voltage of each full-bridge circuit is not very high (limited by the IGBT device withstand voltage), but the amplitude of the AC output voltage of whole cascade full-bridge circuit can reach higher value, so this device can not need transformer just can be directly connected to electric pressure common in the electrical network (such as 35KV, 10KV); And the voltage waveform of its AC output can adopt the nearest level of staircase waveform to approach modulation technique and approach very much sinusoidal wave, thereby no matter device is operated in ice-melt state or STATCOM state, ac-side current and the voltage harmonic content of device are very low, therefore device of the present invention need to not configure a large amount of passive filters based on capacitor and reactor at AC, thereby greatly reduces the floor space of whole device.And because this device do not need to adopt pulse-width modulation (PWM) technology, the switching loss of IGBT can reduce, output current can improve, can reduce the electromagnetic interference of other equipment in the transformer station.
Claims (6)
1. the DC great current deicing apparatus that has the STATCOM function, it is characterized in that: by the STATCOM(1 of two circuit topologies and the identical chain structure of parameter) and an ice-melt commutation disconnecting link matrix (2) formation, two STATCOM(1) end links to each other with the three-phase alternating current bus, two STATCOM(1) other end links to each other with ice-melt commutation disconnecting link matrix (2), ice-melt commutation disconnecting link matrix (2) is comprised of six isolation switchs, six isolation switchs and two STATCOM(1) match and correspondingly be divided into two groups, two ends of each group isolation switch connect respectively STATCOM(1) with the A that treats DC ice-melting mutually, the B phase, the C phase.
2. the DC great current deicing apparatus with STATCOM function according to claim 1, it is characterized in that described STATCOM(1) each circuitry phase by full-bridge circuit (3) cascade of several direct current side joint capacitors after and an AC reactor (4) series connection consist of, AC reactor (4) is connected on input or the output of circuit.
3. the DC great current deicing apparatus with STATCOM function according to claim 1, it is characterized in that described STATCOM(1) each circuitry phase by full-bridge circuit (3) cascade of several direct current side joint capacitors after and two AC reactor (4) series connection consist of, two AC reactor (4) are connected on respectively input and the output of circuit.
4. according to claim 2 or 3 described DC great current deicing apparatus with STATCOM function, it is characterized in that the full-bridge circuit (3) of described direct current side joint capacitor is by four IGBT(5 with anti-paralleled diode), a direct current capacitor (6), a contactor (7) consist of, four IGBT(5 with anti-paralleled diode) consist of a full-bridge circuit, direct current capacitor (6) is connected on the DC side of this full-bridge circuit, and contactor (7) is attempted by the interchange input side of this full-bridge circuit.
5. the DC great current deicing apparatus with STATCOM function according to claim 1, it is characterized in that: during ice-melt, two STATCOM(1) all adopt the star-star connection mode, one of them STATCOM(1) neutral point is connected 2 with ice-melt commutation disconnecting link matrix) positive pole connect, another STATCOM(1) neutral point is connected 2 with ice-melt commutation disconnecting link matrix) negative pole connect, the neutral point voltage that controller is controlled its anodal STATCOM raises gradually and is Udc/2, the neutral point voltage of negative pole STATCOM is reduced to-Udc/2 gradually, thereby so that just be connected on, the ice melting current value Idc=Udc/R that is risen to gradually setting by the direct current on the ice-melt wire of negative pole, wherein, R is by the resistance of ice-melt wire, Idc is ice-melt direct current set point, and Udc=Udc/2-(Udc/2) is the output dc voltage of DC ice melting power supply.
6. the DC great current deicing apparatus with STATCOM function according to claim 1, it is characterized in that: when DC great current deicing apparatus is operated in the STATCOM state, all isolation switchs in the ice-melt commutation disconnecting link matrix (2) all are shown in an open position, DC great current deicing apparatus just becomes two independently STATCOM(1), STATCOM(1) the mode of connection can enough star-star connection modes, also can enough delta connection modes; Two STATCOM(1) can be connected on the same ac bus, also can be connected on two different ac bus; Two STATCOM(1) can move simultaneously, also can isolated operation.
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Cited By (6)
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| CN103715643A (en) * | 2013-12-27 | 2014-04-09 | 北京四方继保自动化股份有限公司 | Container type DC deicing system and control method |
| WO2015184955A1 (en) * | 2014-06-03 | 2015-12-10 | 南方电网科学研究院有限责任公司 | Voltage source type dc ice melting and static synchronous compensation device and method for controlling same |
| US20160072267A1 (en) * | 2014-03-07 | 2016-03-10 | China Southern Power Grid Technology Research Institute Co., Ltd | Voltage source converter based direct current deicer and controlling method thereof |
| CN106786310A (en) * | 2017-02-21 | 2017-05-31 | 中国南方电网有限责任公司超高压输电公司贵阳局 | A kind of super-pressure ice-melt optimizes system and optimization method |
| CN109038444A (en) * | 2018-08-22 | 2018-12-18 | 南方电网科学研究院有限责任公司 | Compact voltage source direct-current ice melting device |
| CN110224365A (en) * | 2019-06-20 | 2019-09-10 | 贵州电网有限责任公司 | DC de-icing device and method based on diode rectification and full-bridge MMC inverter |
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| CN103715643A (en) * | 2013-12-27 | 2014-04-09 | 北京四方继保自动化股份有限公司 | Container type DC deicing system and control method |
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| US20160072267A1 (en) * | 2014-03-07 | 2016-03-10 | China Southern Power Grid Technology Research Institute Co., Ltd | Voltage source converter based direct current deicer and controlling method thereof |
| US10516257B2 (en) * | 2014-03-07 | 2019-12-24 | China Southern Power Grid Technology Research Institute Co., Ltd. | Voltage source converter based direct current deicer and controlling method thereof |
| WO2015184955A1 (en) * | 2014-06-03 | 2015-12-10 | 南方电网科学研究院有限责任公司 | Voltage source type dc ice melting and static synchronous compensation device and method for controlling same |
| CN106786310A (en) * | 2017-02-21 | 2017-05-31 | 中国南方电网有限责任公司超高压输电公司贵阳局 | A kind of super-pressure ice-melt optimizes system and optimization method |
| CN109038444A (en) * | 2018-08-22 | 2018-12-18 | 南方电网科学研究院有限责任公司 | Compact voltage source direct-current ice melting device |
| CN110224365A (en) * | 2019-06-20 | 2019-09-10 | 贵州电网有限责任公司 | DC de-icing device and method based on diode rectification and full-bridge MMC inverter |
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