CN103490492B - High voltage direct current electric power system - Google Patents

High voltage direct current electric power system Download PDF

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CN103490492B
CN103490492B CN201310381629.0A CN201310381629A CN103490492B CN 103490492 B CN103490492 B CN 103490492B CN 201310381629 A CN201310381629 A CN 201310381629A CN 103490492 B CN103490492 B CN 103490492B
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electric power
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CN103490492A (en
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张企宇
朱永忠
李孝众
王俊平
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Beijing Baidu Netcom Science and Technology Co Ltd
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Beijing Baidu Netcom Science and Technology Co Ltd
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Abstract

The present invention proposes a kind of novel off-line type high-voltage direct-current electric power system framework being applied to data center.New system architecture has following features: one, new architecture information technoloy equipment adopts civil power direct-furnish, the mode of the complete off-line of high voltage direct current, and efficiency is higher than conventional high-tension direct current online mode; Two, load DC bus adds rectifier cubice for subsequent use, is shared by subsystems, greatly improves system reliability with small investment; Three, off-line mode reduces the use of rectification module, improves system effectiveness, reduces input cost; Four, batteries uses diode access load, utilizes the advantage of diode nature afterflow and reverse-biased cut-off, without the need to manual control switch, can realize the automatism isolation by power supply group and rectifier cubice for subsequent use.In general, new construction for electricity has practicality, high reliability, efficient and low input advantage.

Description

High voltage direct current electric power system
Technical field
The present invention relates to power technique fields, particularly relate to a kind of high voltage direct current electric power system.
Background technology
In existing data center, usually use UPS(Uninterruptible Power System, uninterrupted power supply) be main power supply unit, but this equipment exists, and conversion efficiency is low, Harmonics of Input is large, reliability is low, high in cost of production shortcoming.In this context, HVDC(High-Voltage Direct Current, high voltage direct current transmission) technology enters the visual field of people, and moves to maturity gradually.
At present, the supply power voltage of domestic high voltage dc transmission technology main flow is 240V, the framework form of this power supply technique is, using rectifier output and storage battery to export receives on same DC bus, realizes the power supply to bearing power and the management of charging and discharging to batteries by direct current supply control system.Such as, as shown in Figure 1, current high-voltage direct current is made up of rectifier cubice and direct current cabinet, and rectification module output-parallel is articulated on DC bus, is load supplying after direct current cabinet distribution.When high voltage direct current electric power system normal power supply, rectification module bears whole power stages, and storage battery is then in floating charge state; When high voltage direct current electric power system fault, storage battery is load supplying by the direct current supply bus of direct current cabinet.
But there is following problem in existing high voltage dc transmission technology:
1), high-voltage direct current is generally line model, and rectification module can produce power loss, causes the efficiency of entire system to reduce;
2), the capacity configuration of rectification module is generally maximal workload and the battery charging desired volume of load, and therefore cause needing to arrange multiple rectification module, input cost is very high;
3), the online charging/discharging function of storage battery cannot use in off-line mode at present.
Summary of the invention
The present invention is intended at least solve the problems of the technologies described above.
For this reason, first object of the present invention is to propose a kind of high voltage direct current electric power system.This system has that efficiency is high, Productive statistics is low, reliability is high, operate advantage quickly and easily.
To achieve these goals, the high voltage direct current electric power system of first aspect present invention embodiment comprises: multiple load; Be respectively the civil power direct-furnish bus of described multiple load supplying; Be respectively the multiple sub-electric power system of described multiple load supplying, each described sub-electric power system comprises further: the first rectifier cubice, and described first rectifier cubice comprises at least one rectification module, and one end of described first rectifier cubice is connected with ac bus; The first switch that first batteries is connected with described first batteries with one end; First diode, the anode of described first diode is connected with the other end of described first rectifier cubice with described first switch; Load DC bus, described load DC bus is connected with the negative electrode of described first diode, and described load DC bus is load supplying corresponding to described sub-electric power system; First power-supply controller, described first power-supply controller is connected with described first switch, and it is that described load is with DC bus powered that described first power-supply controller controls described first switch; And be respectively the commutation system for subsequent use that described multiple sub-electric power system powers.
According to the high voltage direct current electric power system of the embodiment of the present invention, at least there is following advantage:
1) adopt civil power direct-furnish, scheme that high voltage direct current powers off-line mode, power supplying efficiency is all higher than traditional high voltage direct current line model power supply plan;
2) load DC bus adds rectifier cubice for subsequent use, can be shared by each sub-electric power system, greatly improve the reliability of system with less input;
3) rectifier cubice for subsequent use is in warm standby state, ensure that DC bus for subsequent use is always charged, can ensure when one of them sub-electric power system breaks down like this, only need namely can be system by a closed switch and provide redundant power supply, operate quick and convenient.
4) batteries uses diode access load, utilizes the advantage of diode nature afterflow and reverse-biased cut-off, without the need to manual control switch, can realize the automatism isolation by power supply group and rectifier cubice for subsequent use;
5) greatly reduce the quantity of rectification module under off-line mode, reduce input cost;
6) off-line mode adds accumulator testing DC bus, according to the disconnection of system pattern and running status automatic control switch with closed, solves the problem of the regular discharge test of batteries under high voltage direct current off-line mode with simple and practical method.Test bus, in the storage battery non-test phase, can realize the function of DC bus for subsequent use completely, reduce the input of DC bus for subsequent use.
In sum, the high voltage direct current electric power system of the embodiment of the present invention have that efficiency is high, cost drop into low, reliability is high, operate advantage quickly and easily.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein,
Fig. 1 is the structural representation of existing high voltage direct current electric power system;
Fig. 2 is the structural representation of off-line mode high voltage direct current electric power system according to an embodiment of the invention;
Fig. 3 is the structural representation of high voltage direct current electric power system off-line mode power supply control according to an embodiment of the invention.
Embodiment
Be described below in detail embodiments of the invention, the example of embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.On the contrary, embodiments of the invention comprise fall into attached claims spirit and intension within the scope of all changes, amendment and equivalent.
In describing the invention, it is to be appreciated that term " first ", " second " etc. are only for describing object, and instruction or hint relative importance can not be interpreted as.In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " is connected ", " connection " should be interpreted broadly, such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.In addition, in describing the invention, except as otherwise noted, the implication of " multiple " is two or more.
Describe and can be understood in flow chart or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiments of the invention person of ordinary skill in the field.
Below with reference to the accompanying drawings high voltage direct current electric power system according to the embodiment of the present invention is described.
At present, the framework form of domestic HVDC (High Voltage Direct Current) transmission system is, uses rectifier output and storage battery to export and receives on same DC bus, realize the power supply to bearing power and the management of charging and discharging to batteries by direct current supply control system.
Fig. 2 is the structural representation of off-line mode high voltage direct current electric power system according to an embodiment of the invention, and Fig. 3 is the structural representation of high voltage direct current electric power system off-line mode power supply control according to an embodiment of the invention.
As shown in Figures 2 and 3, high voltage direct current electric power system comprises: multiple load 100, civil power direct-furnish bus 200, multiple sub-electric power system 300, ac bus 400, test DC bus 500, commutation system 600 for subsequent use, wherein, multiple sub-electric power system 300 comprises: the first rectifier cubice 311, first batteries 312, first switch 313, load DC bus 330, first diode 314, first power-supply controller 315, second switch 316, second rectifier cubice 321, second batteries 322, 3rd switch 323, second diode 324, second power-supply controller 325 and the 4th switch 326, commutation system 600 for subsequent use comprises: rectifier cubice 610 for subsequent use, DC bus 620 for subsequent use and the 5th switch 630.
Wherein, multiple load 100 can be the blade server be such as applied in data center, many power service device, printer, scanner, facsimile machine etc.
Be respectively the civil power direct-furnish bus 200 of multiple load supplying.
Be respectively the multiple sub-electric power system 300 of multiple load supplying, wherein, every sub-electric power system comprises the first rectifier cubice 311, first rectifier cubice 311 and comprises at least one rectification module, and one end of the first rectifier cubice 311 is connected with ac bus 400; The first switch 313 that first batteries 312 is connected with the first batteries 312 with one end; One end of first diode 314, first diode 314 is connected with the other end of the first rectifier cubice 311 with the first switch 313; Load DC bus 330, load DC bus 330 is connected with the other end of the first diode 314, and load DC bus 330 is that the load 100 of sub-electric power system 300 correspondence is powered; First power-supply controller 315, first power-supply controller 315 is connected with the first diode 314 with the first switch 313 respectively, and the first power-supply controller 315 controls the first switch 313 and powers for load DC bus 330.
Be respectively the commutation system for subsequent use 600 of multiple sub-electric power system 300 power supply.
In one embodiment of the invention, sub-electric power system 300 also comprises second switch 316, one end of second switch 316 is connected with the first rectifier cubice 311, and the other end of second switch 316 is connected with test DC bus 500, and the first power-supply controller 315 controls second switch 316.
In one embodiment of the invention, sub-electric power system 300 also comprises the second rectifier cubice 321, second rectifier cubice 321 and comprises at least one rectification module, and one end of the second rectifier cubice 321 is connected with ac bus 400; The 3rd switch 323 that second batteries 322, second batteries 322 is connected with the second batteries 322 with one end; One end of second diode 324, second diode 324 is connected with the other end of the second rectifier cubice 321 with the 3rd switch 323, and the other end of the second diode 324 is connected with load DC bus 330; Second power-supply controller 325, second power-supply controller 325 is connected with the second diode 324 with the 3rd switch 323 respectively, and the second power-supply controller 325 controls the 3rd switch 323 and powers for load DC bus 330.
In one embodiment of the invention, sub-electric power system 300 also comprises the 4th switch 326, one end of 4th switch 326 is connected with the second rectifier cubice 321, and the other end of the 4th switch 326 is connected with test DC bus 500, and the second power-supply controller 325 controls the 4th switch 326.
In one embodiment of the invention, commutation system 600 for subsequent use comprises rectifier cubice 610 for subsequent use, and rectifier cubice 610 for subsequent use comprises at least one rectification module, and one end of rectifier cubice 610 for subsequent use is connected with ac bus 400; The DC bus for subsequent use 620 be connected with rectifier cubice 610 for subsequent use, the other end of DC bus 620 for subsequent use is connected with multiple 5th switch 630, and the other end of multiple 5th switch 630 is connected with multiple sub-electric power system 300 respectively.
Function and the operation principle of each part in high voltage direct current electric power system is elaborated below in conjunction with Fig. 2 and Fig. 3.
1) electric power system part: as shown in Figure 2, high voltage direct current electric power system can be made up of multiple sub-electric power system 300, such as shown in fig. 1, by sub-electric power system 300(1#), sub-electric power system 300(2#), sub-electric power system 300(3#) ... sub-electric power system 300(n#) composition.Wherein, the system configuration of every sub-electric power system 300 is all identical, powers to respectively corresponding load 100.Sub-electric power system 300 is linked on test DC bus 500 by second switch 316 and the 4th switch 326, can reach the object of battery discharging test under high voltage direct current off-line mode, improve the maintainability of system.
2) sub-electric power system part: as shown in Figure 2, every sub-electric power system 300 can comprise two power supply groups, i.e. power supply group 1 and power supply group 2, and each power supply group is primarily of a rectifier cubice, a diode and two switch compositions.Each power supply group all configures a group storage battery group, and power supply group is charged to this batteries, the management of discharging.For sub-electric power system 300(1#), two groups of identical rectifier cubices can be comprised in sub-electric power system 300, i.e. the first rectifier cubice 311 and the second rectifier cubice 321, two group storage battery group, i.e. the first batteries 312 and the second batteries 322, one group of diode, i.e. two groups of switches of the first diode 314 and the second diode 324 and correspondence, i.e. the first switch 313 and the 3rd switch 323, second switch 316 and the 4th switch 326.Wherein, the first rectifier cubice 311 and the second rectifier cubice 321 all can comprise one or more rectification module.
3) commutation system part for subsequent use: be also furnished with a set of commutation system for subsequent use 600 in high voltage direct current electric power system.For sub-electric power system 300(1#), rectifier cubice 610 for subsequent use is linked on DC bus 620 for subsequent use, sub-electric power system 300(1#) be connected with DC bus 620 for subsequent use by the 5th switch 630, DC bus 620 for subsequent use and sub-electric power system 300(1#) in the first diode 314, second diode 324 coordinate the load that can be sub-electric power system 300 to make redundant power supply, which increase the reliability of entire system.Should be understood that commutation system 600 for subsequent use is linked in sub-electric power system 300 by DC bus 620 for subsequent use and each corresponding 5th switch 620 of sub-electric power system 300, thus, realize sharing of multiple sub-electric power system.Wherein, DC bus 700 for subsequent use can be arranged separately, also can replace with test DC bus 500.Because test DC bus 500 only accumulator checking time use, most time is vacant, and the access of stand-by equipment adopts the mode of electricity behaviour switching, mutually isolated time normal, so test DC bus 500 and can meet stand-by power supply requirement completely, and system architecture is become simple, reduce costs.
The operation principle of off-line mode in high voltage direct current electric power system is elaborated below in conjunction with Fig. 2 and Fig. 3.
In one embodiment of the invention, the first power-supply controller 315 is connected with the rectification module in the first rectifier cubice 311, and the first power-supply controller 315 controls the output state of the first rectifier cubice 311.Wherein, output state includes but not limited to one or more in voltage, electric current and power that the first rectifier cubice 311 exports.
In one embodiment of the invention, when the first batteries 312 is discharged, and the electricity of the first batteries 312 lower than default electricity time, the first power-supply controller 315 controls the first switch 313 and disconnects.Wherein, default electricity can be system default, or to arrange in systems in which.In addition, when mains-supplied is normal, keeps the first switch 313 to close and think that the first batteries 312 is charged.Thus, batteries can be protected.
In one embodiment of the invention, when the electricity of the first batteries 312 is lower than default electricity, the first power-supply controller 315 controls the first switch 313 and closes or keep this switch to be closure state, to realize charging to the first batteries 312.In addition, the power output of the first power-supply controller 315 also for adjusting the first rectifier cubice 311 keeps constant to make the charging current of the first batteries 312.
In one embodiment of the invention, the first power-supply controller 315 is also for adjusting the output voltage of the first rectifier cubice 311 to complete the charging to the first batteries 312.
In one embodiment of the invention, in disconnection mode, when the civil power that civil power direct-furnish bus 200 connects is normal, the first rectifier cubice 311 and the second rectifier cubice 321 are in unloaded hot standby state.
Particularly, for sub-electric power system 300(1#).During normal work, civil power direct-furnish bus 200 bears whole power stage.First batteries 312 accesses load DC bus 330 in support.Rectification module is in disconnection mode without the need to providing power stage to load 100, with this, only need configure a small amount of module, meet the no-load loss of the first batteries 312 charging and power supply, greatly reduce the capacity of the first rectifier cubice and the second rectifier cubice, significantly reduce input cost.
Rectifier cubice 600 for subsequent use configures the rectification module of full capacity, at least can provide power at full capacity for a sub-electric power system 300, most rectification modules under normal circumstances in rectifier cubice 600 for subsequent use are in resting state, rectifier cubice 600 for subsequent use is in warm standby state, i.e. output voltage but not output current.When the civil power direct-furnish bus 200 in a sub-electric power system 300 breaks down or needs to safeguard, closed 5th switch 800, rectifier cubice 600 for subsequent use is powered by the load 100 in DC bus for subsequent use 700 pairs of sub-electric power systems of fault.
More specifically, in disconnection mode, the first power-supply controller 315 controls closed first switch 313, and disconnect the 3rd switch 316, now rectification module output voltage 270V, the first batteries 312 is in floating charge state, accesses to load DC bus 330 by the first diode 314.Because no-load current flows through, therefore now the first diode 314 loss is negligible.During emergency, when needing the first batteries 312 to provide power stage, rectification module enters invariable power pattern along with bearing power improves, and namely electric current raises and voltage reduces, and now the first batteries 312 starts electric discharge, to make up the raising of load.In addition, the another one that should be understood that in sub-electric power system 300 is powered group, i.e. power supply group 2 is identical with function with the structure of the power supply group 1 of above-mentioned explanation, no longer multiple superfluous herein.
In addition, also by test DC bus 500, discharge test is carried out to the first batteries 312.Particularly, for power supply group 1, when the first batteries 312 is discharged, first power-supply controller 315 controls the 3rd switch 316 and closes, and control rectifier cubice Head switches to disconnect, now, the first diode 314 plays reverse cut-off effect, to make the first rectifier cubice 311 isolate with sub-electric power system 300 completely, now the first batteries 312 can be powered to load 100.
Should be understood that and also can carry out discharge test by the way to the second batteries 322, its principle is identical, no longer multiple superfluous herein.In addition, when discharge test is carried out to the first batteries 312, ensure that the second batteries 322 in sub-electric power system 300 is online.In addition, after the first batteries 312 discharge test, after needing that the first batteries 312 is returned to fully charged state, carrying out discharge test to the second batteries 322, thus, the risk in test can be reduced.
In addition, for sub-electric power system 300(1#), group electric power system 300(1#) civil power direct-furnish bus 200 break down or need to safeguard, the first batteries 312 and the second batteries 322 are discharged to load 100 by the first corresponding respectively diode 314 and the second diode 324.Now, closed 5th switch 800, rectifier cubice 600 for subsequent use automatically will start in tens seconds, the voltage of DC bus 700 for subsequent use is higher than the voltage of the first batteries 312 and the second batteries 322, first batteries 312 and the second batteries 322 stop powering to load 100, turn and are powered by DC bus for subsequent use 700 pairs of loads 100.Because the first diode 314 and the second diode 324 have reverse cut-off effect, back-up system can not carry out charging action to the first batteries 312 and the second batteries 322.If carry out charging action, then the charging current of the first batteries 312 and the second batteries 322 will be uncontrollable, there is potential safety hazard.Thus, improve the reliability of entire system, and flexibly simple to operate.
According to the high voltage direct current electric power system of the embodiment of the present invention, at least there is following advantage:
1) adopt the scheme of civil power direct-furnish, high voltage direct current off-line mode, power supplying efficiency is all higher than the power supply plan that traditional high voltage direct current line model exports;
2) load DC bus adds rectifier cubice for subsequent use, can be shared by each sub-electric power system, greatly improve the reliability of system with less input;
3) rectifier cubice for subsequent use is in warm standby state, ensure that DC bus for subsequent use is always charged, can ensure when one of them sub-electric power system breaks down like this, only need namely can be system by a closed switch and provide redundant power supply, operate quick and convenient;
4) batteries uses diode access load, utilizes the advantage of diode nature afterflow and reverse-biased cut-off, without the need to manual control switch, can realize the automatism isolation by power supply group and rectifier cubice for subsequent use;
5) greatly reduce the quantity of rectification module under off-line mode, reduce hardware input cost in early stage;
6) off-line mode adds accumulator testing DC bus, according to the disconnection of system pattern and running status automatic control switch with closed, solves the problem of the regular discharge test of batteries under high voltage direct current off-line mode with simple and practical method.And test bus in the storage battery non-test phase, the function of DC bus for subsequent use can be realized completely, reduce the input of DC bus for subsequent use.
In sum, the high voltage direct current electric power system of the embodiment of the present invention has the advantage that practicality is high, reliability is high, maintainability is high, efficiency is high, Productive statistics is low.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.

Claims (9)

1. a high voltage direct current electric power system, is characterized in that, comprising:
Multiple load;
Be respectively the civil power direct-furnish bus of described multiple load supplying;
For the multiple sub-electric power system of described multiple load supplying, each described sub-electric power system comprises further:
First rectifier cubice, described first rectifier cubice comprises at least one rectification module, and one end of described first rectifier cubice is connected with ac bus;
The first switch that first batteries is connected with described first batteries with one end;
First diode, the anode of described first diode is connected with the other end of described first rectifier cubice with described first switch;
Load DC bus, described load DC bus is connected with the negative electrode of described first diode, and described load DC bus is load supplying corresponding to described sub-electric power system;
First power-supply controller, described first power-supply controller is connected with described first switch, and it is that described load is with DC bus powered that described first power-supply controller controls described first switch; And
Be respectively the commutation system for subsequent use that described multiple sub-electric power system is powered;
Wherein, described sub-electric power system also comprises:
Second switch, one end of described second switch is connected with described first rectifier cubice, and the other end of described second switch is connected with test DC bus, and described first power-supply controller controls described second switch.
2. high voltage direct current electric power system as claimed in claim 1, it is characterized in that, described first power-supply controller is connected with the rectification module in described first rectifier cubice, and described first power-supply controller controls the output voltage of described first rectifier cubice.
3. high voltage direct current electric power system as claimed in claim 1, is characterized in that, when described first batteries electric discharge, and the electricity of described first batteries lower than default electricity time, described first power-supply controller controls described first switch and disconnects.
4. high voltage direct current electric power system as claimed in claim 2, it is characterized in that, described first power-supply controller is also for adjusting the output voltage of described first rectifier cubice to complete the charging to described first batteries.
5. high voltage direct current electric power system as claimed in claim 1, it is characterized in that, described sub-electric power system also comprises:
Second rectifier cubice, described second rectifier cubice comprises at least one rectification module, and one end of described second rectifier cubice is connected with ac bus;
The 3rd switch that second batteries is connected with described second batteries with one end;
Second diode, the anode of described second diode is connected with the other end of described second rectifier cubice with described 3rd switch;
Second power-supply controller, described second power-supply controller is connected with described 3rd switch, and it is that described load is with DC bus powered that described second power-supply controller controls described 3rd switch.
6. high voltage direct current electric power system as claimed in claim 5, it is characterized in that, described sub-electric power system also comprises:
4th switch, one end of described 4th switch is connected with described second rectifier cubice, and the other end of described 4th switch is connected with test DC bus, and described second power-supply controller controls described 4th switch.
7. high voltage direct current electric power system as claimed in claim 5, it is characterized in that, in disconnection mode, when the civil power that described civil power direct-furnish bus connects is normal, the first rectifier cubice and the second rectifier cubice are in unloaded hot standby state.
8. high voltage direct current electric power system as claimed in claim 1, it is characterized in that, described commutation system for subsequent use comprises:
Rectifier cubice for subsequent use, described rectifier cubice for subsequent use comprises at least one rectification module, and one end of described rectifier cubice for subsequent use is connected with ac bus;
Rectifier cubice full configuration for subsequent use, meets a sub-electric power system power demands, and during subsystem fault, a closed switch can come into operation, and its rectification module is in resting state under normal circumstances, and energy consumption is low;
The DC bus for subsequent use be connected with described rectifier cubice for subsequent use, the other end of described DC bus for subsequent use is connected with multiple 5th switch, and the other end of described multiple 5th switch is connected with described multiple sub-electric power system respectively.
9. high voltage direct current electric power system as claimed in claim 8, it is characterized in that, described DC bus for subsequent use can install additional separately, also can be described test DC bus.
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