CN205657602U - Current conversion station and change of current system - Google Patents

Current conversion station and change of current system Download PDF

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Publication number
CN205657602U
CN205657602U CN201620447957.5U CN201620447957U CN205657602U CN 205657602 U CN205657602 U CN 205657602U CN 201620447957 U CN201620447957 U CN 201620447957U CN 205657602 U CN205657602 U CN 205657602U
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China
Prior art keywords
current
brachium pontis
change
inverter
conversion station
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CN201620447957.5U
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Chinese (zh)
Inventor
刘继权
周敏
伦振坚
贾红舟
鲁丽娟
彭冠炎
廖毅
郭金川
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China Energy Construction Group Guangdong Electric Power Design Institute Co Ltd
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China Energy Construction Group Guangdong Electric Power Design Institute Co Ltd
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Abstract

The utility model relates to a current conversion station and change of current system, the converter transformer of current conversion station passes through neutral point grounding in the change of current system, and converter transformer is connected with the transverter in the current conversion station through three -phase isolation switch again. The neutral point resistance, three -phase isolation switch, transverter that utilize the converter transformer of current conversion station form current path with certain mode ground connection, charge to the transverter, that is to say, the utility model discloses a transverter need not traditional charging resistor and bypass isolator in the current conversion station when charging. Because just in converter transformer, neutral point resistance does not use in the transverter charging process neutral point resistance R script in traditional scheme moreover, consequently, compare in traditional current conversion station, the utility model discloses a charging resistor and bypass isolator have been saved in the current conversion station of change of current system to the occupation of land and the investment of the equipment of having saved have alleviateed the maintenance work volume of equipment.

Description

Current conversion station and commutation system
Technical field
This utility model relates to electric and electronic technical field, particularly relates to current conversion station and commutation system.
Background technology
Along with the development of Power Electronic Technique, high voltage, Large Copacity have become the weight of Power Electronic Technique Want developing direction, high voltage, the jumbo the most numerous occasion of power electronics inverter have important application.
Flexible DC power transmission based on voltage source converter, because of have the meritorious and idle transmission of independent regulation, The features such as the ability to transmit electricity of raising AC system, in fields such as wind-electricity integration, AC system interconnection, urban electricity supplies Conjunction has increasing application.Modularization multi-level converter (Modular Multilevel based on half-H-bridge Converter, MMC) because there is modularized design, being easy to dilatation, exchange outlet side exit potential harmonic content Few without exchanging the advantages such as brachium pontis device, then become the main flow topology of flexible DC power transmission.
Inverter charging is the first step of inverter work, as it is shown in figure 1, at MMC Neutron module electric capacity When starting precharge, it is typically all and realizes charging current restriction based on three-phase alternating current loop current-limiting resistance, with this Ensure inverter safety in charging process.In tradition current conversion station, the charging method of inverter need to configure specially The current-limiting resistance of door, this current-limiting resistance only works in inverter start-up course, does not rise and appoint after startup What effect, utilization rate of equipment and installations is low, on the contrary at the probability of failure in increase loop, loop, adds plant maintenance Workload, also increases the floor space of current conversion station.
Utility model content
Based on this, it is necessary to for the problem that the charging resistor utilization rate in tradition current conversion station is low, it is provided that a kind of Current conversion station and commutation system.
A kind of current conversion station, including converter power transformer, three-phase isolation switch, inverter, the first earthed switch and Second earthed switch, wherein, converter power transformer includes neutral resistor;
One end of three-phase breaker connects one to one with the three-phase input end of converter power transformer, converter power transformer One end of three-phase output end and three-phase isolation switch connect one to one;
The neutral point of converter power transformer is connected with one end of neutral resistor, the other end ground connection of neutral resistor;
The other end of three-phase isolation switch connects one to one with the three-phase input end of inverter;
The direct-flow positive pole end of inverter and one end of the first earthed switch connect, the other end of the first earthed switch Ground connection;One end of the direct current negative pole end of inverter and the second earthed switch connects, another of the second earthed switch End ground connection.
According to above-mentioned current conversion station of the present utility model, the converter power transformer in current conversion station is connect by neutral resistor Ground, converter power transformer is connected with the inverter in current conversion station further through three-phase isolation switch, the direct current of inverter Positive terminal passes through the first ground switch earthing, and the direct current negative pole end of inverter passes through the second ground switch earthing. During implementing, utilize the neutral resistor of converter power transformer in current conversion station, three-phase isolation switch, Inverter and earthed switch form current path, as long as AC system is by three-phase breaker and converter power transformer Connecting, inverter just can be charged by the three-phase alternating current that AC system provides, say, that this practicality In novel current conversion station inverter charging time without traditional charging resistor and bypass isolating switch thereof.Due to Neutral resistor is originally just in converter power transformer, and neutral resistor is not in the change of current in traditional scheme Device charging process uses, therefore, compared to traditional current conversion station, changing of commutation system of the present utility model Stream eliminates charging resistor and bypass isolating switch thereof in station, thus saves occupation of land and the investment of equipment, subtracts The light maintenance workload of equipment.
A kind of commutation system, including several current conversion stations and several direct-current isolating switchs, current conversion station includes three Phase chopper, converter power transformer, three-phase isolation switch, inverter, wherein, converter power transformer includes neutrality Point resistance;
One end of three-phase breaker connects one to one with the three-phase input end of converter power transformer, converter power transformer One end of three-phase output end and three-phase isolation switch connect one to one;
The neutral point of converter power transformer is connected with one end of neutral resistor, the other end ground connection of neutral resistor;
The other end of three-phase isolation switch connects one to one with the three-phase input end of inverter;
Connected two-by-two by different direct-current isolating switchs respectively between the direct-flow positive pole end of the inverter of each current conversion station Connect, connected two-by-two by different direct-current isolating switchs respectively between the direct current negative pole end of the inverter of each current conversion station Connect.
According to above-mentioned commutation system of the present utility model, the converter power transformer in the current conversion station of commutation system passes through Neutral resistor ground connection, converter power transformer is connected with the inverter in current conversion station further through three-phase isolation switch, The direct-flow positive pole end of the inverter of all current conversion stations is connected with each other by corresponding direct-current isolating switch, and direct current is born Extremely it is connected with each other by corresponding direct-current isolating switch.During implementing, utilize in current conversion station The neutral resistor of converter power transformer, three-phase isolation switch, inverter and direct-current isolating switch, Ke Yiyu The neutral resistor of inverter, three-phase isolation switch and converter power transformer in other current conversion stations forms electric current and leads to Road, as long as AC system is connected with converter power transformer by three-phase breaker, the three of AC system offer are intersected Inverter just can be charged by stream electricity, say, that in the current conversion station of commutation system of the present utility model Inverter charging time without traditional charging resistor and bypass isolating switch thereof.Owing to neutral resistor R is former This is just in converter power transformer, and neutral resistor is not in inverter charging process in traditional scheme Use, therefore, compared to traditional current conversion station, the current conversion station of commutation system of the present utility model eliminates Charging resistor and bypass isolating switch thereof, thus save occupation of land and the investment of equipment, alleviate the dimension of equipment Protect workload.
Accompanying drawing explanation
Fig. 1 is the charging process schematic diagram of inverter in tradition current conversion station;
Fig. 2 is the structural representation of the current conversion station of one of them embodiment;
Fig. 3 is the concrete structure schematic diagram of the current conversion station of one of them embodiment;
Fig. 4 is the another kind of concrete structure schematic diagram of the current conversion station of one of them embodiment;
Fig. 5-a is a kind of charging current path schematic diagram of the current conversion station of one of them embodiment;
Fig. 5-b is the another kind of charging current path schematic diagram of the current conversion station of one of them embodiment;
Fig. 6 is the structural representation of the commutation system of one of them embodiment;
Fig. 7-a is a kind of charging current path schematic diagram of the commutation system of one of them embodiment;
Fig. 7-b is the another kind of charging current path schematic diagram of the commutation system of one of them embodiment.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing and Embodiment, is described in further detail this utility model.Should be appreciated that described herein specifically Embodiment, only in order to explain this utility model, does not limit protection domain of the present utility model.
Shown in Figure 2, it is the structural representation of the current conversion station of an embodiment.The change of current in this embodiment Stand power model, including converter power transformer TR, three-phase isolation switch SA and SB and SC, inverter, One earthed switch ES1 and the second earthed switch ES2, wherein, converter power transformer TR includes neutral resistor R;
One end of three-phase breaker DL connects one to one with the three-phase input end of converter power transformer TR, the change of current The three-phase output end of transformator TR connects one to one with one end of three-phase isolation switch SA and SB and SC;
The neutral point of converter power transformer TR is connected with one end of neutral resistor R, neutral resistor R another One end ground connection;
The other end of three-phase isolation switch SA and SB and SC connects with the three-phase input end one_to_one corresponding of inverter Connect;
The direct-flow positive pole end of inverter and one end of the first earthed switch ES1 connect, the first earthed switch ES1 Other end ground connection;The direct current negative pole end of inverter and one end of the second earthed switch ES2 connect, and second connects The other end ground connection of ground switch ES2.
In the present embodiment, the converter power transformer TR in current conversion station passes through neutral resistor R ground connection, the change of current Transformator TR is connected with the inverter in current conversion station further through three-phase isolation switch SA and SB and SC, changes The direct-flow positive pole end of stream device passes through second by the first earthed switch ES1 ground connection, the direct current negative pole end of inverter Earthed switch ES2 ground connection.During implementing, utilize the neutrality of converter power transformer TR in current conversion station Point resistance R, three-phase isolation switch SA and SB and SC, inverter and earthed switch ES1 and ES2 are formed Current path, as long as the other end of three-phase breaker DL is connected with AC system, the three-phase that AC system provides Inverter just can be charged by alternating current, it can be seen that, in current conversion station of the present utility model, inverter is filling Without traditional charging resistor and bypass isolating switch thereof during electricity.Owing to neutral resistor R is originally just in the change of current In transformator TR, and neutral resistor R does not use in inverter charging process in traditional scheme, Therefore, compared to traditional current conversion station, the current conversion station of commutation system of the present utility model eliminates charged electrical Resistance and bypass isolating switch thereof, thus save occupation of land and the investment of equipment, alleviate the maintenance work of equipment Amount.
Wherein in an embodiment, as it is shown on figure 3, the inverter of current conversion station include first group of change of current brachium pontis, Second group of change of current brachium pontis, first group of brachium pontis reactor and second group of brachium pontis reactor, first group of change of current brachium pontis and The bar number of the change of current brachium pontis in second group of change of current brachium pontis is three, first group of brachium pontis reactor and second group of brachium pontis The number of the brachium pontis reactor in reactor is three;
In first group of change of current brachium pontis, the positive terminal of three change of current brachium pontis 110,120,130 is connected together as The direct-flow positive pole end of inverter, the negative pole of three change of current brachium pontis 140,150,160 in second group of change of current brachium pontis End is connected together as the direct current negative pole end of inverter;
In first group of change of current brachium pontis, negative pole end and first group of brachium pontis of three change of current brachium pontis 110,120,130 are electric In anti-device, one end of three brachium pontis reactor Lc1, Lc2, Lc3 connects one to one, second group of change of current brachium pontis In the positive terminal of three change of current brachium pontis 140,150,160 and second group of brachium pontis reactor in three brachium pontis electricity One end of anti-device Lc4, Lc5, Lc6 connects one to one, three brachium pontis reactance in first group of brachium pontis reactor Three brachium pontis reactor Lc4 in the other end of device Lc1, Lc2, Lc3 and second group of brachium pontis reactor, Lc5, The other end of Lc6 connects one to one;
The other end of three brachium pontis reactor Lc1, Lc2, Lc3 and second group of bridge in first group of brachium pontis reactor Three connections that in arm reactor, the other end of three brachium pontis reactor Lc4, Lc5, Lc6 connects one to one Point is as the three-phase input end of inverter;
In the present embodiment, inverter mainly includes two groups of change of current brachium pontis, group often all includes three changes of current Brachium pontis, often three change of current brachium pontis in group and three-phase isolation switch one_to_one corresponding, at one group of single-phase isolating switch After closing with three-phase breaker, when the first earthed switch and the second earthed switch are respectively closed, can be the most right The change of current brachium pontis that should organize single-phase isolating switch is charged by two groups of change of current brachium pontis.
Wherein in an embodiment, as shown in Figure 4, change of current brachium pontis includes several power models of concatenation, Power model possesses the first connection terminal and second and connects terminal;
In change of current brachium pontis, the second connection terminal of previous power model and the first of later power model Connecting terminal to connect, after concatenation, the first connection terminal of the power model of stem is as the positive terminal of change of current brachium pontis, Second connection terminal of the power model of afterbody is as the negative pole end of change of current brachium pontis.
In the present embodiment, mainly by power model concatenation in change of current brachium pontis, inverter is carried out Charging, is substantially charged the power model in converter bridge arm.
It addition, power model is except half-H-bridge type structure and bridge-type structure, it is also possible to it is similar to be that other possess The structure of function, such as CDSM (Clamp Doulbe Sub-modular, the double power model of clamp) etc., power Wholly-controled device in module can be insulated gate bipolar transistor, it is also possible to be other kinds of full-control type Device, various disconnecting switch can be chopper, it is also possible to is the isolation of other forms possessing switching function Switch.
In current conversion station, the charging method of inverter comprises the following steps:
In above-mentioned current conversion station, closing three-phase breaker DL, in Guan Bi three-phase isolation switch is separated by and leaves Close SA, close the first earthed switch ES1, by AC system to a change of current in first group of change of current brachium pontis Brachium pontis is charged, until the voltage stabilization of this change of current brachium pontis is to the phase voltage of AC system, wherein, and should It is corresponding that bar change of current brachium pontis is isolated switch SA with the one of Guan Bi, another of AC system and three-phase breaker DL End connects, and charging current path is as shown in Fig. 5-a.
Unlock the half power model in this change of current brachium pontis, until in this change of current brachium pontis the most remaining one The voltage stabilization of half-power module is to the phase voltage of AC system;
Half power model in this change of current brachium pontis of locking, unlocks remaining half merit in this change of current brachium pontis Rate module, until the voltage stabilization of the half power model in this change of current brachium pontis is to the phase voltage of AC system;
Now, the voltage stabilization of this change of current brachium pontis is to the twice of the phase voltage of AC system;
Disconnect the first earthed switch ES1, be back to close the step of the first earthed switch ES1, close second Earthed switch ES2, is charged, directly a change of current brachium pontis in second group of change of current brachium pontis by AC system The voltage stabilization of the power model in this change of current brachium pontis to second group of change of current brachium pontis is to the phase of AC system The twice of voltage, disconnects the second earthed switch ES2, wherein, this change of current brachium pontis in second group of change of current brachium pontis Being isolated switch SA with the one of Guan Bi corresponding, charging current path is as shown in Fig. 5-b;
Disconnecting the one of Guan Bi and be isolated switch SA, be back to close in three-phase isolation switch one is isolated switch Step, close other one and be isolated switch, until the voltage stabilization of the power model of all change of current brachium pontis is extremely The twice of the phase voltage of AC system;
In this step, be respectively closed one be isolated switch SB and SC, make one be isolated switch SB and The voltage stabilization of the power model of change of current brachium pontis corresponding for SC is to the twice of the phase voltage of AC system, in this mistake Journey also to close the first earthed switch ES1 and the second earthed switch ES2, detailed process and Guan Bi one successively Being isolated switch SA similar, do not repeat them here, this step can make the electricity of the power model of each change of current brachium pontis The twice of the stable phase voltage to AC system of pressure;
Guan Bi three-phase isolation switch SA and SB and SC, unlocks in each change of current brachium pontis in regulation current conversion station The number of power model, makes the power model of each change of current brachium pontis boost to rated voltage.
By each switch of closed and disconnected, the power model in inverter can be charged, in charging During without using charging resistor, without operation charging resistor bypass isolating switch, simplify operation Flow process.
According to above-mentioned current conversion station, this utility model also provides for a kind of commutation system, the most of the present utility model below The embodiment of commutation system is described in detail.
Commutation system includes several current conversion stations and several direct-current isolating switchs, and current conversion station includes change of current transformation Device TR, three-phase isolation switch SA and SB and SC, inverter, wherein, during converter power transformer TR includes Property point resistance R;
One end of three-phase breaker DL connects one to one with the three-phase input end of converter power transformer TR, the change of current The three-phase output end of transformator TR connects one to one with one end of three-phase isolation switch SA and SB and SC;
The neutral point of converter power transformer TR is connected with one end of neutral resistor R, neutral resistor R another One end ground connection;
The other end of three-phase isolation switch SA and SB and SC connects with the three-phase input end one_to_one corresponding of inverter Connect;
Connected two-by-two by different direct-current isolating switchs respectively between the direct-flow positive pole end of the inverter of each current conversion station Connect, connected two-by-two by different direct-current isolating switchs respectively between the direct current negative pole end of the inverter of each current conversion station Connect.
In the present embodiment, the converter power transformer TR in the current conversion station of commutation system passes through neutral resistor R Ground connection, converter power transformer TR is further through three-phase isolation switch SA and SB and SC and the change of current in current conversion station Device connects, and the direct-flow positive pole end of the inverter of all current conversion stations is connected with each other by corresponding direct-current isolating switch, Direct current negative pole end is connected with each other by corresponding direct-current isolating switch.During implementing, utilize the change of current Neutral resistor R of converter power transformer TR in standing, three-phase isolation switch SA and SB and SC, inverter And direct-current isolating switch, can with the inverter in other current conversion stations, three-phase isolation switch SA and SB and SC, neutral resistor R of converter power transformer TR form current path, as long as AC system is broken by three-phase The converter power transformer TR of road device DL and a current conversion station connects, and the three-phase alternating current that AC system provides is with regard to energy The inverter of this current conversion station and the inverter of other coupled current conversion stations are charged, say, that Inverter in the current conversion station of commutation system of the present utility model when charging without traditional charging resistor and Bypass isolating switch.Due to neutral resistor R originally just in converter power transformer TR, and in tradition side In case, neutral resistor R does not use in inverter charging process, therefore, compared to traditional current conversion station, The current conversion station of commutation system of the present utility model eliminates charging resistor and bypass isolating switch thereof, thus saves Save occupation of land and the investment of equipment, alleviate the maintenance workload of equipment.
Additionally, the direct-flow positive pole end of the inverter of all current conversion stations is connected two-by-two by different direct-current isolating switchs Connecing, the direct current negative pole end of the inverter of all current conversion stations is connected two-by-two by different direct-current isolating switchs, only Close corresponding direct-current isolating switch, so that it may so that the inverter of a current conversion station and another one or multiple The inverter of current conversion station connects, and operates the three-phase isolation switch of current conversion station, it is possible to realize direct current The inverter of the current conversion station that disconnecting switch connects is charged simultaneously.
Wherein in an embodiment, as shown in Figure 6, current conversion station is two, the respectively first current conversion station and Second current conversion station, direct-current isolating switch is four, respectively two the first direct-current isolating switchs and two second Direct-current isolating switch;
The direct-flow positive pole end of the inverter of the first current conversion station the first direct-current isolating switchs and the by two concatenations The direct-flow positive pole end of the inverter of two current conversion stations connects, and the direct current negative pole end of the inverter of the first current conversion station passes through The direct current negative pole end of the second direct-current isolating switch of two concatenations and the inverter of the second current conversion station connects.
In the present embodiment, after two the first direct-current isolating switchs and two the second direct-current isolating switchs all close, The three-phase isolation switch of current conversion station is operated, it is possible to achieve two changes of current that direct-current isolating switch is connected The inverter stood is charged simultaneously.
Wherein in an embodiment, the inverter of current conversion station includes first group of change of current brachium pontis, second group of change of current Brachium pontis, first group of brachium pontis reactor and second group of brachium pontis reactor, first group of change of current brachium pontis and second group of change of current The bar number of the change of current brachium pontis in brachium pontis is three, in first group of brachium pontis reactor and second group of brachium pontis reactor The number of brachium pontis reactor is three;
In first group of change of current brachium pontis, the positive terminal of three change of current brachium pontis 110,120,130 is connected together as The direct-flow positive pole end of inverter, the negative pole of three change of current brachium pontis 140,150,160 in second group of change of current brachium pontis End is connected together as the direct current negative pole end of inverter;
In first group of change of current brachium pontis, negative pole end and first group of brachium pontis of three change of current brachium pontis 110,120,130 are electric In anti-device, one end of three brachium pontis reactor Lc1, Lc2, Lc3 connects one to one, second group of change of current brachium pontis In the positive terminal of three change of current brachium pontis 140,150,160 and second group of brachium pontis reactor in three brachium pontis electricity One end of anti-device Lc4, Lc5, Lc6 connects one to one, three brachium pontis reactance in first group of brachium pontis reactor Three brachium pontis reactor Lc4 in the other end of device Lc1, Lc2, Lc3 and second group of brachium pontis reactor, Lc5, The other end of Lc6 connects one to one;
The other end of three brachium pontis reactor Lc1, Lc2, Lc3 and second group of bridge in first group of brachium pontis reactor Three connections that in arm reactor, the other end of three brachium pontis reactor Lc4, Lc5, Lc6 connects one to one Point is as the three-phase input end of inverter;
In the present embodiment, inverter mainly includes two groups of change of current brachium pontis, group often all includes three changes of current Brachium pontis, often three change of current brachium pontis in group and three-phase isolation switch one_to_one corresponding, at one group of single-phase isolating switch Guan Bi and three-phase breaker Guan Bi time, can respectively in two groups of change of current brachium pontis to organizing single-phase isolating switch Change of current brachium pontis be charged.
Wherein in an embodiment, change of current brachium pontis includes several power models of concatenation, and power model has Standby first connects terminal and second connects terminal;
In change of current brachium pontis, the second connection terminal of previous power model and the first of later power model Connecting terminal to connect, after concatenation, the first connection terminal of the power model of stem is as the positive terminal of change of current brachium pontis, Second connection terminal of the power model of afterbody is as the negative pole end of change of current brachium pontis.
In the present embodiment, mainly by power model concatenation in change of current brachium pontis, inverter is carried out Charging, is substantially charged the power model in converter bridge arm.
In commutation system, the charging method of inverter comprises the following steps:
In above-mentioned commutation system, the direct-flow positive pole end of the inverter at Guan Bi current commutation station and other current conversion stations Inverter direct-flow positive pole end between direct-current isolating switch, the direct current of inverter at Guan Bi current commutation station Direct-current isolating switch between the direct current negative pole end of the inverter of negative pole end and other current conversion stations;
Close the three-phase isolation switch in other current conversion stations;
In Guan Bi current commutation station, the one of three-phase isolation switch is isolated switch, the three-phase at Guan Bi current commutation station Chopper;By AC system, two change of current brachium pontis of inverter in current commutation station are charged, simultaneously Also all change of current brachium pontis of inverter in other current conversion stations are charged, until the voltage of each change of current brachium pontis is steady The fixed phase voltage to AC system, wherein, in current commutation station two change of current brachium pontis of inverter with currently change In stream station, the one of Guan Bi is isolated switch correspondence, another of the three-phase breaker at AC system and current commutation station End connects;
Unlock the half power model in two change of current brachium pontis respectively, until two change of current brachium pontis each remain The voltage stabilization of half power model to the phase voltage of AC system;
Half power model in two change of current brachium pontis of locking respectively, unlocks in two change of current brachium pontis respective respectively Remaining half power model, until the voltage stabilization of the half power model in two change of current brachium pontis is to exchange The phase voltage of system;
Now, the twice of two all stable phase voltages to AC system of change of current brachium pontis;
Disconnect the three-phase breaker in current commutation station, disconnect closed in current commutation station and be isolated switch, Being back to close in current commutation station and be isolated the step of switch, in Guan Bi current commutation station, three are isolated Other the one of switch is isolated switch, until the voltage of the power model of all change of current brachium pontis at current commutation station The twice of the stable phase voltage to AC system;
When closing any one group of single-phase isolating switch of three-phase isolation switch in current commutation station, unlock respectively The half power model in every change of current brachium pontis in other current conversion stations, until every in other current conversion stations is changed In stream brachium pontis, the voltage stabilization of remaining half power model is to the phase voltage of AC system;
Half power model in every change of current brachium pontis in other current conversion stations of locking, unlocks other respectively respectively Every change of current brachium pontis in current conversion station is charged respective remaining half power model in two change of current brachium pontis, Until the voltage stabilization of the half power model in every change of current brachium pontis in other current conversion stations is to AC system Phase voltage;
Now, the voltage of every change of current brachium pontis in other current conversion stations all stablizes the phase voltage to AC system Twice.
At the voltage stabilization of current commutation station and the power model of each change of current brachium pontis of other current conversion stations to exchanging system System phase voltage twice after, Guan Bi current commutation station three-phase isolation switch, regulation current commutation station and its The number of the power model unlocked in each change of current brachium pontis of his current conversion station, makes current commutation station and other current conversion stations The power model of each change of current brachium pontis boost to rated voltage.
By each switch of closed and disconnected, the power model in inverter can be charged, in charging During without using charging resistor, without operation charging resistor bypass isolating switch, simplify operation Flow process.
Concrete, including two current conversion stations and two direct-current isolating switchs with commutation system, power model is As a example by half-H-bridge type, in commutation system, the charging method of inverter comprises the following steps:
The direct-flow positive pole end of the inverter of direct-flow positive pole end and the current conversion station 2 of the inverter of Guan Bi current conversion station 1 it Between direct-current isolating switch, the inverter of direct current negative pole end and the current conversion station 2 of the inverter of Guan Bi current conversion station 1 Direct current negative pole end between direct-current isolating switch;
Three-phase isolation switch SA2 and SB2 in Guan Bi current conversion station 2 and SC2;
In Guan Bi current conversion station 1 one is isolated switch SA1, the three-phase breaker DL1 of Guan Bi current conversion station 1; By AC system, two change of current brachium pontis of inverter in current conversion station 1 are charged, simultaneously also to current conversion station 2 All change of current brachium pontis of middle inverter are charged, until the voltage stabilization of each change of current brachium pontis is to AC system Phase voltage, charging current path is as shown in Fig. 7-a and Fig. 7-b, wherein, in current conversion station 1 two of inverter It is corresponding that change of current brachium pontis is isolated switch SA1 with in current conversion station 1 the one of Guan Bi, AC system and current conversion station 1 The other end of three-phase breaker DL1 connects;
Unlock the half power model in two change of current brachium pontis respectively, until two change of current brachium pontis each remain The voltage stabilization of half power model to the phase voltage of AC system;
Half power model in two change of current brachium pontis of locking respectively, unlocks in two change of current brachium pontis respective respectively Remaining half power model, until the voltage stabilization of the half power model in two change of current brachium pontis is to exchange The phase voltage of system;
Now, the twice of two all stable phase voltages to AC system of change of current brachium pontis;
Disconnect the three-phase breaker DL1 of current conversion station 1, disconnect closed in current conversion station 1 and be isolated switch SA1, It is back to close the step of one group of single-phase isolating switch in current conversion station 1, other in Guan Bi current conversion station 1 It is isolated switch, until the voltage stabilization of the power model of all change of current brachium pontis of current conversion station 1 is to AC system The twice of phase voltage;
In this step, it is that be respectively closed in current conversion station 1 one is isolated switch SB1 and SC1, makes a phase The voltage stabilization of the power model of the change of current brachium pontis that disconnecting switch SB1 is corresponding with SC1 is electric mutually to AC system The twice of pressure, so just can make the voltage stabilization best friend of the power model of all change of current brachium pontis of current conversion station 1 The twice of the phase voltage of streaming system;
When closing any one group of single-phase isolating switch of three-phase isolation switch in current commutation station, unlock respectively The half power model in every change of current brachium pontis in current conversion station 2, until every converter bridge in current conversion station 2 In arm, the voltage stabilization of remaining half power model is to the phase voltage of AC system;
Respectively in two change of current brachium pontis of half power model in every change of current brachium pontis in locking current conversion station 2 Half power model, respectively remaining half power model in every change of current brachium pontis in locking current conversion station 2, Until the voltage stabilization of half power model in every change of current brachium pontis in current conversion station 2 is to the phase of AC system Voltage;
Now, the two of all stable phase voltage to AC system of the voltage of every change of current brachium pontis in current conversion station 2 Times.
At the voltage stabilization of current conversion station 1 and the power model of each change of current brachium pontis of current conversion station 2 to AC system After the twice of phase voltage, three-phase isolation switch SA1 and SB1 and SC1 of Guan Bi current conversion station 1, regulate the change of current Stand 1 and current conversion station 2 each change of current brachium pontis in the number of power model that unlocks, make current conversion station 1 and current conversion station 2 The power model of each change of current brachium pontis boost to rated voltage.
In this utility model, the ordinal number such as " first ", " second " is intended merely to carry out involved parts Distinguish, be defined not for parts itself.
Each technical characteristic of embodiment described above can combine arbitrarily, for making description succinct, the most right The all possible combination of each technical characteristic in above-described embodiment is all described, but, if these skills There is not contradiction in the combination of art feature, is all considered to be the scope that this specification is recorded.
Embodiment described above only have expressed several embodiments of the present utility model, its describe more concrete and In detail, but therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that, it is right For those of ordinary skill in the art, without departing from the concept of the premise utility, it is also possible to do Going out some deformation and improvement, these broadly fall into protection domain of the present utility model.Therefore, this utility model is special The protection domain of profit should be as the criterion with claims.

Claims (7)

1. a current conversion station, it is characterised in that include converter power transformer, three-phase isolation switch, inverter, First earthed switch and the second earthed switch, wherein, described converter power transformer includes neutral resistor;
One end of three-phase breaker connects one to one with the three-phase input end of described converter power transformer, described in change The three-phase output end of convertor transformer connects one to one with one end of described three-phase isolation switch;
The neutral point of described converter power transformer is connected with one end of described neutral resistor, described neutral resistor Other end ground connection;
The other end of described three-phase isolation switch connects one to one with the three-phase input end of described inverter;
The direct-flow positive pole end of described inverter is connected with one end of described first earthed switch, described first ground connection The other end ground connection of switch;The direct current negative pole end of described inverter is connected with one end of described second earthed switch, The other end ground connection of described second earthed switch.
Current conversion station the most according to claim 1, it is characterised in that described inverter includes that first group is changed Stream brachium pontis, second group of change of current brachium pontis, first group of brachium pontis reactor and second group of brachium pontis reactor, described first The bar number of the change of current brachium pontis in group change of current brachium pontis and described second group of change of current brachium pontis is three, described first group of bridge The number of the brachium pontis reactor in arm reactor and described second group of brachium pontis reactor is three;
In described first group of change of current brachium pontis, the positive terminal of three change of current brachium pontis is connected together as described inverter Direct-flow positive pole end, in described second group of change of current brachium pontis, the negative pole end of three change of current brachium pontis is connected together as The direct current negative pole end of described inverter;
In described first group of change of current brachium pontis in the negative pole end of three change of current brachium pontis and described first group of brachium pontis reactor One end of three brachium pontis reactors connects one to one, three change of current brachium pontis in described second group of change of current brachium pontis In positive terminal and second group of brachium pontis reactor, one end of three brachium pontis reactors connects one to one, and described first Three brachium pontis reactance in the other end of three brachium pontis reactors and second group of brachium pontis reactor in group brachium pontis reactor The other end of device connects one to one;
The other end of three brachium pontis reactors and described second group of brachium pontis reactance in described first group of brachium pontis reactor Three junction points that in device, the other end of three brachium pontis reactors connects one to one are as the three of described inverter Phase input.
Current conversion station the most according to claim 2, it is characterised in that described change of current brachium pontis includes concatenation Several power models, described power model possesses the first connection terminal and second and connects terminal;
In described change of current brachium pontis, the second connection terminal of previous power model and later power model First connects terminal connects, and after concatenation, the first connection terminal of the power model of stem is as described change of current brachium pontis Positive terminal, the second connection terminal of the power model of afterbody is as the negative pole end of described change of current brachium pontis.
4. a commutation system, it is characterised in that include several current conversion stations and several direct-current isolating switchs, Described current conversion station includes converter power transformer, three-phase isolation switch, inverter, wherein, described converter power transformer Including neutral resistor;
One end of three-phase breaker connects one to one with the three-phase input end of described converter power transformer, described in change The three-phase output end of convertor transformer connects one to one with one end of described three-phase isolation switch;
The neutral point of described converter power transformer is connected with one end of described neutral resistor, described neutral resistor Other end ground connection;
The other end of described three-phase isolation switch connects one to one with the three-phase input end of described inverter;
Respectively by different direct-current isolating switchs two between the direct-flow positive pole end of the inverter of each described current conversion station Two connect, and are opened by different DC-isolation respectively between the direct current negative pole end of the inverter of each described current conversion station Close and connect two-by-two.
Commutation system the most according to claim 4, it is characterised in that described current conversion station is two, point Not being the first current conversion station and the second current conversion station, described direct-current isolating switch is four, and respectively two first straight Stream disconnecting switch and two the second direct-current isolating switchs;
The direct-flow positive pole end of the inverter of described first current conversion station is by described first DC-isolation of two concatenations Switch is connected with the direct-flow positive pole end of the inverter of described second current conversion station, the inverter of described first current conversion station The change of current by described second direct-current isolating switchs and described second current conversion station of two concatenations of the direct current negative pole end The direct current negative pole end of device connects.
6. according to the commutation system described in claim 4 or 5, it is characterised in that described inverter includes One group of change of current brachium pontis, second group of change of current brachium pontis, first group of brachium pontis reactor and second group of brachium pontis reactor, institute The bar number stating the change of current brachium pontis in first group of change of current brachium pontis and described second group of change of current brachium pontis is three, described The number of the brachium pontis reactor in one group of brachium pontis reactor and described second group of brachium pontis reactor is three;
In described first group of change of current brachium pontis, the positive terminal of three change of current brachium pontis is connected together as described inverter Direct-flow positive pole end, in described second group of change of current brachium pontis, the negative pole end of three change of current brachium pontis is connected together as The direct current negative pole end of described inverter;
In described first group of change of current brachium pontis in the negative pole end of three change of current brachium pontis and described first group of brachium pontis reactor One end of three brachium pontis reactors connects one to one, three change of current brachium pontis in described second group of change of current brachium pontis In positive terminal and second group of brachium pontis reactor, one end of three brachium pontis reactors connects one to one, and described first Three brachium pontis reactance in the other end of three brachium pontis reactors and second group of brachium pontis reactor in group brachium pontis reactor The other end of device connects one to one;
The other end of three brachium pontis reactors and described second group of brachium pontis reactance in described first group of brachium pontis reactor Three junction points that in device, the other end of three brachium pontis reactors connects one to one are as the three of described inverter Phase input.
Commutation system the most according to claim 6, it is characterised in that described change of current brachium pontis includes concatenation Several power models, described power model possess the first connection terminal and second connect terminal;
In described change of current brachium pontis, the second connection terminal of previous power model and later power model First connects terminal connects, and after concatenation, the first connection terminal of the power model of stem is as described change of current brachium pontis Positive terminal, the second connection terminal of the power model of afterbody is as the negative pole end of described change of current brachium pontis.
CN201620447957.5U 2016-05-17 2016-05-17 Current conversion station and change of current system Active CN205657602U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105958851A (en) * 2016-05-17 2016-09-21 中国能源建设集团广东省电力设计研究院有限公司 Convertor station, converter system and convertor charging method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105958851A (en) * 2016-05-17 2016-09-21 中国能源建设集团广东省电力设计研究院有限公司 Convertor station, converter system and convertor charging method
CN105958851B (en) * 2016-05-17 2019-06-28 中国能源建设集团广东省电力设计研究院有限公司 The charging method of converter station and commutation system and its inverter

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