CN105048509A - Auxiliary power system with direct-current frequency converter and direct-current variable-frequency motor - Google Patents
Auxiliary power system with direct-current frequency converter and direct-current variable-frequency motor Download PDFInfo
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Abstract
The invention relates to an auxiliary power system with a direct-current (DC) frequency converter and a DC variable-frequency motor. Specifically, the system comprises an off-site alternating-current (AC) power grid, an on-site AC power grid, an on-site DC power grid, an AC generator or AC generator unit, an AC transformer, an AC/DC converter or transformer, a DC frequency converter, and a DC variable-frequency motor. By adopting the system, variable-speed running of power plant equipment can be effectively realized, the energy loss of the generator unit can be significantly reduced, the overall efficiency of the unit can be improved, and the unit can be simplified. Moreover, the system has the characteristic of controllable cost.
Description
Technical field
The present invention relates to power plant equipment, relate to a kind of station service electrical system being provided with DC frequency-changing device and DC frequency-changing motor particularly.
Background technology
In high power station, according to the change of unit operation operating mode, the equipment such as the electrodynamic pump in power plant, blower fan or compressor generally need variable-speed operation, to reach energy-conservation, improve the object of economy.Existing station service electrical system realizes the variable-speed operation of equipment by the mode that AC converter combines with ac variable-frequency electric motor.Wherein, the operation principle of AC converter first changes industrial frequency AC into direct current, then change direct current into frequency-changing AC, and this transition process causes AC converter to there is larger energy loss, conversion efficiency only about 90%, significantly reduces the economic benefit in system effectiveness and power plant.In addition, because electric power factory equipment rotating speed is different, configure one to one so AC converter and equipment motor are generally, multiple devices then need configuration multiple stage AC converter, and this just makes electrical system complexity loaded down with trivial details, and corresponding cost of investment and operation and maintenance cost also increase thereupon, system operation reliability reduces, and AC converter quantity is more, the energy loss brought is then more, more serious to the negative effect of economy of power plant.Therefore, need the usage quantity reducing AC converter as much as possible, to reduce the energy loss brought due to the introducing of AC converter, guarantee economy during unit variable load operation, simplify electrical system simultaneously thereupon, improve system operation reliability.
Particularly, Fig. 1-2 is that the need equipment of variable-speed operation of mode to station service electrical system adopting AC converter to combine with ac variable-frequency electric motor in prior art carries out the system schematic of speed governing, wherein in station service electrical system shown in Fig. 1, the alternating current that generating set sends is through AC transformer, a part is delivered to AC network outside factory, supplying power for outside, another part is directly connected to AC network in factory, provides station service.For the AC power frequency motor that power is larger, can directly use alternating current in factory.But for the motor of AC frequency conversion, then need to use AC converter, change AC power frequency electricity in factory into alternating-current variable frequency power, and each equipment motor all needs to configure a set of AC converter.Accordingly, AC converter cost of investment is higher, electrical system relative complex.Meanwhile, the access of AC converter can cause system energy loss, decrease in efficiency, there is negative effect to the economy in power plant.
When power plant exist equipment component need to run under lower electric pressure time, in order to meet the demand of part low pressure operation equipment, alternating current in the factory by AC transformer alternating current in the factory of high pressure being transformed into low pressure, as shown in Figure 2.In the factory of Fig. 2 mesolow, AC network both can directly to AC power frequency motor, also can through AC converter frequency conversion rear drive ac variable-frequency electric motor.Similar with Fig. 1, no matter be high pressure or low-voltage alternating-current electrical network in Fig. 2, when powering to ac variable-frequency electric motor, all need man-to-man configuration AC converter, the energy loss in power supply process can be caused thus, influential system efficiency.And the access of AC converter makes that electrical system complexity is loaded down with trivial details, operational reliability reduces, investment maintenance cost increases greatly.
In order to reduce the AC converter quantity of required configuration, simplify electrical system, some power plant adopts the generating of speed change small turbine drive electrical generators, and each equipment motor of frequency-changing AC electric drive that the little machine of unification speed change sends.But the adjustment due to the rotating speed of small turbine adopts admission to adjust valve throttling to realize, and flow restriction control must have throttling loss, reduces whole efficiency.In addition, although this station service electrical system can simplify electrical system, but under same load condition, all devices motor shares same frequency of supply, under this just means that motor that can not be all operates in peak efficiency, certainly exist a part of motor running efficiency on the low side, reduce the whole efficiency of station service electrical system.Therefore, there is energy loss in existing station service electrical system, efficiency is on the low side, electrical system is complicated, the more high key technical problem of frequency converter cost of investment.
In sum, this area in the urgent need to developing a kind of novel reduced energy loss, raise the efficiency, electrical system simplified and the system of controlled the realized electric power factory equipment variable-speed operation of cost.
Summary of the invention
The object of the present invention is to provide a kind of novel reduced energy loss, raise the efficiency, electrical system simplified and the system of controlled the realized electric power factory equipment variable-speed operation of cost.
A first aspect of the present invention, provide a kind of station service electrical system being provided with DC frequency-changing device and DC frequency-changing motor, described system to comprise in AC network outside factory, factory direct current network and alternating current generator or alternating current generating sets, AC transformer, friendship/straight change of current or transformer, DC frequency-changing device and DC frequency-changing motor in AC network, factory, wherein
Described alternating current generator or alternating current generating sets are connected with described AC transformer, and to be delivered to outside described factory AC network in AC network and described factory after the AC power frequency electricity transformation that described alternating current generator or alternating current generating sets exported of described AC transformer respectively;
Described friendship/straight change of current or transformer are connected with AC network in described factory, and described friendship/straight change of current or transformer input direct current network in described factory after the AC power frequency electricity of AC network input in described factory is converted to direct current;
Described DC frequency-changing device is connected with direct current network in described factory, and the direct current of direct current network input in described factory is converted to DC frequency-changing electricity by described DC frequency-changing device;
Described DC frequency-changing motor is connected with described DC frequency-changing device, and DC frequency-changing motor described in described DC frequency-changing electric drive.
In another preference, described AC transformer is three-phase or two-phase.
In another preference, a described friendship/straight change of current or the described DC frequency-changing device of transformer configuration one, and a described DC frequency-changing device can configure one or more DC frequency-changing motor simultaneously.
In another preference, the number of units of the DC frequency-changing motor configured in described system is 1-15 platform, is preferably 1-10 platform, is more preferably 1-8 platform, is 1-5 platform best.
In another preference, described system also comprises DC generator, and described DC generator is connected with direct current network in described factory, for exporting direct current.
In another preference, described DC generator is shared.
In another preference, described " sharing " refers to that direct current that described DC generator exports to input in described factory after direct current network for the equipment use that direct current network in all and described factory is connected.
In another preference, the number of units of described DC generator is 1-15 platform, is preferably 1-10 platform, is more preferably 1-8 platform, is 1-5 platform best.
In another preference, in described friendship/straight change of current or transformer and described factory, between direct current network, be provided with switch A; And/or
Switch B is provided with between direct current network in described DC generator and described factory.
In another preference, when switch A is in off-state and switch B is in closure state, the direct current that described DC generator exports inputs in described factory and is converted to DC frequency-changing electricity to drive described DC frequency-changing motor through described DC frequency-changing device after direct current network.
In another preference, when switch A and switch B is all in closure state, the direct current that described DC generator exports inputs in described factory and is converted to DC frequency-changing electricity to drive described DC frequency-changing motor and/or to be converted to alternating current through described friendship/straight change of current or transformer and to input AC network in described factory through described DC frequency-changing device after direct current network.
In another preference, described system also comprises AC power frequency motor, and described AC power frequency motor is connected with AC network in described factory.
In another preference, the number of units of described AC power frequency motor is 1-15 platform, is preferably 1-10 platform, is more preferably 1-8 platform, is 1-5 platform best.
In another preference, in described factory, AC network to comprise in factory AC network low pressure stage electrical network in AC network high pressure section electrical network and factory; And/or
In described factory, direct current network to comprise in factory direct current network low pressure stage electrical network in direct current network high pressure section electrical network and factory.
In another preference, in described factory, AC network high pressure section electrical network is connected through AC transformer with AC network low pressure stage electrical network in described factory.
In another preference, described AC transformer inputs AC network low pressure stage electrical network in described factory after the high-voltage alternating power frequency electric of AC network high pressure section electrical network is converted to low-voltage alternating-current power frequency electric in described factory.
In another preference, described friendship/straight change of current or transformer are connected with AC network low pressure stage electrical network in described factory, and described friendship/straight change of current or transformer input direct current network low pressure stage electrical network in described factory after the low-voltage alternating-current power frequency electric of AC network low pressure stage electrical network input in described factory is converted to low-voltage DC.
In another preference, described DC frequency-changing device is connected with direct current network low pressure stage electrical network in described factory, and the low-voltage DC that the low pressure stage electrical network of direct current network in described factory inputs is converted to low-voltage direct variable-frequency electric by described DC frequency-changing device.
In another preference, described DC frequency-changing motor is connected with described DC frequency-changing device, and described low-voltage direct variable-frequency electric drives described DC frequency-changing motor.
In another preference, described system also comprises the AC power frequency motor be connected with AC network low pressure stage electrical network in described factory.
In another preference, described system also comprises AC converter and ac variable-frequency electric motor, wherein,
Described AC converter is connected with AC network in described factory, and the AC power frequency electricity of AC network input in described factory is converted to alternating-current variable frequency power by described AC converter;
Described ac variable-frequency electric motor is connected with described AC converter, and ac variable-frequency electric motor described in described AC frequency conversion electric drive.
In another preference, described AC converter and described ac variable-frequency electric motor configure one to one.
In another preference, described AC converter is identical with the number of units of described ac variable-frequency electric motor, and described number of units is respectively 1-15 platform, is preferably 1-10 platform, is more preferably 1-8 platform, is 1-5 platform best.
In another preference, described alternating current generating sets is heavy-duty generator group.
In another preference, the capacity >=300MW of described alternating current generating sets, preferably >=600MW, more preferably >=900MW, best >=1000MW.
A second aspect of the present invention, provides a kind of method that described to the first aspect of the present invention station service electrical system carries out speed governing, uses DC frequency-changing device and DC frequency-changing motor to carry out speed governing.
Should be understood that within the scope of the present invention, above-mentioned each technical characteristic of the present invention and can combining mutually between specifically described each technical characteristic in below (eg embodiment), thus form new or preferred technical scheme.As space is limited, tiredly no longer one by one to state at this.
Accompanying drawing explanation
Fig. 1-2 is that the need equipment of variable-speed operation of mode to station service electrical system adopting AC converter to combine with ac variable-frequency electric motor in prior art carries out the system schematic of speed governing.
Fig. 3 is the schematic diagram of the station service electrical system being provided with DC frequency-changing device and DC frequency-changing motor in the embodiment of the present invention 1.
Fig. 4 is the schematic diagram of the station service electrical system being provided with DC frequency-changing device and DC frequency-changing motor in the embodiment of the present invention 2.
Fig. 5 is the schematic diagram of the station service electrical system being provided with DC frequency-changing device and DC frequency-changing motor in the embodiment of the present invention 3.
Fig. 6 is the schematic diagram of the station service electrical system being provided with DC frequency-changing device and DC frequency-changing motor in the embodiment of the present invention 4.
Fig. 7 is the schematic diagram of the station service electrical system being provided with DC frequency-changing device and DC frequency-changing motor in the embodiment of the present invention 5.
Embodiment
The present inventor is through long-term and deep research, be surprised to find that the mode adopting DC frequency-changing device and DC frequency-changing motor to combine, effectively can realize the variable-speed operation of equipment, adopt the station service electrical system being provided with DC frequency-changing device and DC frequency-changing motor significantly can reduce the energy loss of generating set simultaneously, improve the whole efficiency of unit, described unit is simplified, and there is the controlled feature of cost.Based on above-mentioned discovery, inventor completes the present invention.
Term
As used herein, term " frequency conversion " refers to change frequency.Particularly, the technology that the mode by changing frequency of supply realizes the control of rotating machinery running speed is called converter technique.The core of converter technique is frequency converter, and the change controlling frequency of supply by it realizes the adjustment of motor operation speed.Frequency converter comprises DC frequency-changing device and AC converter.
As used herein, term " alternating current generator " refers to that the electricity sent is the generator of alternating current, and the frequency of usual alternating current is fixed value, is 50Hz or 60Hz.
As used herein, term " AC transformer " refers to the equipment that the voltage of alternating current is raised or reduced.
As used herein, term " hands over/directly change of current or transformer ", " handing over/straight converter " is used interchangeably with " converter ", all refer to equipment alternating current being converted to galvanic equipment or direct current being converted to alternating current, the voltage before and after conversion can raise, to reduce or constant.
As used herein, term " DC frequency-changing device " refers to input dc power and exports the equipment of the alternating current being alterable frequency.
As used herein, term " DC frequency-changing motor " refers to the motor that the rotational frequency supporting with DC frequency-changing device changes.
As used herein, term " DC generator " refers to that the electricity sent is galvanic generator.
As used herein, term " AC power frequency motor " refers to the constant alternating current of incoming frequency, the motor that working speed is constant.
As used herein, term " AC converter " refers to the alternating current that incoming frequency is constant and exports the equipment of the alternating current of alterable frequency.
As used herein, term " ac variable-frequency electric motor " refers to the motor that the rotational frequency supporting with AC converter changes.
Station service electrical system
The invention provides a kind of station service electrical system being provided with DC frequency-changing device and DC frequency-changing motor, described system to comprise in AC network outside factory, factory direct current network and alternating current generator or alternating current generating sets, AC transformer, friendship/straight change of current or transformer, DC frequency-changing device and DC frequency-changing motor in AC network, factory, wherein
Described alternating current generator or alternating current generating sets are connected with described AC transformer, and to be delivered to outside described factory AC network in AC network and described factory after the AC power frequency electricity transformation that described alternating current generator or alternating current generating sets exported of described AC transformer respectively;
Described friendship/straight change of current or transformer are connected with AC network in described factory, and described friendship/straight change of current or transformer input direct current network in described factory after the AC power frequency electricity of AC network input in described factory is converted to direct current;
Described DC frequency-changing device is connected with direct current network in described factory, and the direct current of direct current network input in described factory is converted to DC frequency-changing electricity by described DC frequency-changing device;
Described DC frequency-changing motor is connected with described DC frequency-changing device, and DC frequency-changing motor described in described DC frequency-changing electric drive.
In another preference, described AC transformer is three-phase or two-phase.
In the present invention, a described friendship/straight change of current or the described DC frequency-changing device of transformer configuration one, and a described DC frequency-changing device can configure one or more DC frequency-changing motor simultaneously.
In another preference, the number of units of the DC frequency-changing motor configured in described system is 1-15 platform, is preferably 1-10 platform, is more preferably 1-8 platform, is 1-5 platform best.
In the present invention, described system also comprises DC generator, and described DC generator is connected with direct current network in described factory, for exporting direct current.
In another preference, described DC generator is shared.
In another preference, described " sharing " refers to that direct current that described DC generator exports to input in described factory after direct current network for the equipment use that direct current network in all and described factory is connected.
In another preference, the number of units of described DC generator is 1-15 platform, is preferably 1-10 platform, is more preferably 1-8 platform, is 1-5 platform best.
In the present invention, switch A is provided with between direct current network in described friendship/straight change of current or transformer and described factory; And/or
Switch B is provided with between direct current network in described DC generator and described factory.
In the present invention, when switch A is in off-state and switch B is in closure state, the direct current that described DC generator exports inputs in described factory and is converted to DC frequency-changing electricity to drive described DC frequency-changing motor through described DC frequency-changing device after direct current network.
In another preference, when switch A and switch B is all in closure state, the direct current that described DC generator exports inputs in described factory and is converted to DC frequency-changing electricity to drive described DC frequency-changing motor and/or to be converted to alternating current through described friendship/straight change of current or transformer and to input AC network in described factory through described DC frequency-changing device after direct current network.
In the present invention, described system also comprises AC power frequency motor, and described AC power frequency motor is connected with AC network in described factory.
In another preference, the number of units of described AC power frequency motor is 1-15 platform, is preferably 1-10 platform, is more preferably 1-8 platform, is 1-5 platform best.
In the present invention, in described factory, AC network to comprise in factory AC network low pressure stage electrical network in AC network high pressure section electrical network and factory; And/or
In described factory, direct current network to comprise in factory direct current network low pressure stage electrical network in direct current network high pressure section electrical network and factory.
In another preference, in described factory, AC network high pressure section electrical network is connected through AC transformer with AC network low pressure stage electrical network in described factory.
In another preference, described AC transformer inputs AC network low pressure stage electrical network in described factory after the high-voltage alternating power frequency electric of AC network high pressure section electrical network is converted to low-voltage alternating-current power frequency electric in described factory.
In another preference, described friendship/straight change of current or transformer are connected with AC network low pressure stage electrical network in described factory, and described friendship/straight change of current or transformer input direct current network low pressure stage electrical network in described factory after the low-voltage alternating-current power frequency electric of AC network low pressure stage electrical network input in described factory is converted to low-voltage DC.
In another preference, described DC frequency-changing device is connected with direct current network low pressure stage electrical network in described factory, and the low-voltage DC that the low pressure stage electrical network of direct current network in described factory inputs is converted to low-voltage direct variable-frequency electric by described DC frequency-changing device.
In another preference, described DC frequency-changing motor is connected with described DC frequency-changing device, and described low-voltage direct variable-frequency electric drives described DC frequency-changing motor.
In another preference, described system also comprises the AC power frequency motor be connected with AC network low pressure stage electrical network in described factory.
In the present invention, described system also comprises AC converter and ac variable-frequency electric motor, wherein,
Described AC converter is connected with AC network in described factory, and the AC power frequency electricity of AC network input in described factory is converted to alternating-current variable frequency power by described AC converter;
Described ac variable-frequency electric motor is connected with described AC converter, and ac variable-frequency electric motor described in described AC frequency conversion electric drive.
In another preference, described AC converter and described ac variable-frequency electric motor configure one to one.
In another preference, described AC converter is identical with the number of units of described ac variable-frequency electric motor, and described number of units is respectively 1-15 platform, is preferably 1-10 platform, is more preferably 1-8 platform, is 1-5 platform best.
In the present invention, described alternating current generating sets is heavy-duty generator group.
In another preference, the capacity >=300MW of described alternating current generating sets, preferably >=600MW, more preferably >=900MW, best >=1000MW.
Described station service electrical system forms primarily of with lower part:
1) alternating current generator, AC transformer, DC generator;
2)/directly the change of current or transformer is handed over, for alternating current in factory is become direct current in factory;
3) DC frequency-changing device, for being transformed into DC frequency-changing electricity by direct current in factory;
4) AC converter, for being transformed into alternating-current variable frequency power by AC power frequency electricity in factory;
5) DC frequency-changing motor, AC power frequency motor, the ac variable-frequency electric motor of electric power factory equipment.
Usually, the course of work of AC converter is first alternating current constant for frequency is converted to direct current, and then direct current is converted to the alternating current of changeable frequency, and energy needs twice conversion, there is twice energy loss; And DC frequency-changing device is the alternating current being once converted to changeable frequency by direct current, only exist primary energy loss, therefore adopt " DC frequency-changing device and DC frequency-changing motor " substitute " AC converter and ac variable-frequency electric motor " can be effectively energy-conservation.
Station service electrical system of the present invention, to the electrodynamic pump, the equipment such as blower fan or compressor that need variable-speed operation, configuring direct current adjustable frequency motor, public converter, DC frequency-changing device and/or the small turbine DC generator without throttling loss are set simultaneously, to each DC frequency-changing motor, each equipment variable-speed operation demand can be met.Compared with alternating frequency conversion technique, this technology can not only reduce the energy loss in conversion process, reaches energy-conservation object, can also improve the sale of electricity income of power plant simultaneously, and electrical system is relatively simple and reliable, cost of investment and the maintenance cost of electric equipment are also minimized.In addition, small turbine, without throttling loss, has higher whole efficiency, makes electrical system also more efficient, and then can significantly reduce final equipment investment cost.
Method
Present invention also offers a kind of method of described station service electrical system being carried out to speed governing, use DC frequency-changing device and DC frequency-changing motor to carry out speed governing.
Compared with prior art, the present invention has following major advantage:
(1) can effective implemention electric power factory equipment variable-speed operation;
(2) significantly can simplify electrical system, reduce cost of equipment maintenance, improve system operation reliability, reduce cost of investment;
(3) energy loss in AC frequency conversion process can effectively be avoided;
(4) there is not throttling loss, the whole efficiency of system can be significantly improved;
(5) there is energy-saving and environmental protection, high economic benefit.
Below in conjunction with specific embodiment, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.The experimental technique of unreceipted actual conditions in the following example, the usually conveniently conditioned disjunction condition of advising according to manufacturer.Unless otherwise indicated, otherwise percentage and number calculate by weight.
Unless otherwise defined, all specialties used in literary composition and scientific words and one skilled in the art the meaning be familiar with identical.In addition, any method similar or impartial to described content and material all can be applicable in the inventive method.The use that better implementation method described in literary composition and material only present a demonstration.
Embodiment 1
The electricity that alternating current generating sets sends to be delivered to respectively outside factory and AC network in factory after AC transformer transformation.AC network each equipment motor in factory in factory.Wherein, the industrial-frequency alternating current that the AC power frequency motor that power is larger can directly use AC network in factory to provide.DC frequency-changing motor then needs by friendship/straight change of current or transformer and DC frequency-changing device.First, friendship/straight converter changes alternating current in factory in factory direct current.Next, then change direct current in factory into DC frequency-changing electricity by DC frequency-changing device, for driving DC frequency-changing motor.
In this system, friendship/straight converter and DC frequency-changing device are shared device, can connect multiple stage DC frequency-changing motor, without the need to configuring separately one to one simultaneously.Just because of this, whole electrical system is simplified greatly, and the cost of investment of frequency converter reduces thereupon, and also improves the operational reliability of whole system, and the maintenance cost of electrical system is also relatively low.In addition, due to electrical system relative simplicity, the energy loss that converter, frequency converter cause can reduce greatly, and therefore system economy apparently higher than AC frequency conversion station service electrical system, can meet the requirement that power plant is energy-conservation, improves power plant's sale of electricity income.
Embodiment 2
Scheme represented by Fig. 4 is identical with the general principle of Fig. 3 scheme, and difference is for the equipment motor run in a low voltage state, transformer of increasing exchanges as required, provides AC power frequency electricity in low pressure factory.In the factory of low pressure, AC power frequency electricity can give AC power frequency motor, also by handing over/straight converter convert low pressure to factory in direct current, then supply DC frequency-changing motor by after the frequency conversion of DC frequency-changing device.Similar with Fig. 3, in Fig. 4, the converter of high and low pressure side and DC frequency-changing device are all public, can drive multiple stage DC frequency-changing motor simultaneously.
Compared with Fig. 2, shown in Fig. 4, electrical system is obviously simplified, and system energy loss is also reduced greatly, and power supply economics is improved significantly.
Embodiment 3
Scheme shown by Fig. 5 is identical with the general principle of Fig. 3 scheme, difference is still to remain ac variable-frequency electric motor in Fig. 5, this part motor still uses AC frequency conversion system, also namely still change AC power frequency electricity in factory into alternating-current variable frequency power by AC converter, drive ac variable-frequency electric motor with alternating-current variable frequency power.
This station service electrical system schemes synthesis AC frequency conversion station service electrical system and DC frequency-changing station service electrical system, this is that existing AC frequency conversion station service electrical system provides energy-conservation space.For built AC frequency conversion station service electrical system, both can reserve part ac variable-frequency electric motor, reduce improvement cost, also can improve efficiency and the economy of station service electrical system, thus reach energy-conservation requirement.
Embodiment 4
Scheme shown in Fig. 6 is identical with the general principle of Fig. 5, and difference is that Fig. 6 adds DC generator.Part or all of direct current can be provided by means of DC generator.
Drive frequency conversion generator to provide compared with the technology of variable-frequency electric with small turbine throttle grverning, the small turbine of DC generator, without throttling loss, has higher whole efficiency.
Embodiment 5
Scheme shown in Fig. 7 is identical with the general principle of Fig. 6, and difference is that direct current that in Fig. 7, DC generator sends not only can for direct current network in factory, and can be passed through the converter of friendships/directly and to be transmitted back in factory in AC network.
Scheme in Fig. 7 makes station service power consumption rate lower, and selling benefit is more.
Generally speaking, the present invention is directed to the technical problem of existing station service electrical system, by to the Equipments Setting DC frequency-changing motor needing variable-speed operation, and newly-increased public friendship/straight converter and DC generator, direct current is provided, then by public DC frequency-changing device to each DC frequency-changing motor.This technical scheme not only simplify electrical system, improves system reliability, reduces electric equipment cost of investment, the more important thing is the energy loss that This solution avoids in AC frequency conversion process.Drive frequency conversion generator to provide compared with the technology of variable-frequency electric with small turbine throttle grverning, the small turbine of DC generator, without throttling loss, has higher whole efficiency.The present invention has obvious energy-saving benefit, in raising economy of power plant and sale of electricity income, have stronger competitiveness.
Theory analysis shows, a 1000MW ultra supercritical unit is as adopted the present invention, and year economize on electricity about 3,000 ten thousand kilowatt hours, direct economy income reaches more than 1,200 ten thousand yuan.
The all documents mentioned in the present invention are quoted as a reference all in this application, are just quoted separately as a reference as each section of document.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after having read above-mentioned instruction content of the present invention.
Reference numeral:
1: alternating current generator
2: AC transformer
3: hand over/directly the change of current or transformer
4: DC frequency-changing device
5: DC frequency-changing motor (multiple stage)
6: DC generator (multiple stage)
7: AC power frequency motor (multiple stage)
8: AC converter (multiple stage)
9: ac variable-frequency electric motor (multiple stage)
Claims (10)
1. one kind is provided with the station service electrical system of DC frequency-changing device and DC frequency-changing motor, it is characterized in that, described system to comprise in AC network outside factory, factory direct current network and alternating current generator or alternating current generating sets, AC transformer, friendship/straight change of current or transformer, DC frequency-changing device and DC frequency-changing motor in AC network, factory, wherein
Described alternating current generator or alternating current generating sets are connected with described AC transformer, and to be delivered to outside described factory AC network in AC network and described factory after the AC power frequency electricity transformation that described alternating current generator or alternating current generating sets exported of described AC transformer respectively;
Described friendship/straight change of current or transformer are connected with AC network in described factory, and described friendship/straight change of current or transformer input direct current network in described factory after the AC power frequency electricity of AC network input in described factory is converted to direct current;
Described DC frequency-changing device is connected with direct current network in described factory, and the direct current of direct current network input in described factory is converted to DC frequency-changing electricity by described DC frequency-changing device;
Described DC frequency-changing motor is connected with described DC frequency-changing device, and DC frequency-changing motor described in described DC frequency-changing electric drive.
2. the system as claimed in claim 1, is characterized in that, a described friendship/straight change of current or the described DC frequency-changing device of transformer configuration one, and a described DC frequency-changing device can configure one or more DC frequency-changing motor simultaneously.
3. the system as claimed in claim 1, is characterized in that, described system also comprises DC generator, and described DC generator is connected with direct current network in described factory, for exporting direct current.
4. system as claimed in claim 3, is characterized in that, is provided with switch A in described friendship/straight change of current or transformer and described factory between direct current network; And/or
Switch B is provided with between direct current network in described DC generator and described factory.
5. system as claimed in claim 4, it is characterized in that, when switch A is in off-state and switch B is in closure state, the direct current that described DC generator exports inputs in described factory and is converted to DC frequency-changing electricity to drive described DC frequency-changing motor through described DC frequency-changing device after direct current network.
6. the system as claimed in claim 1, is characterized in that, described system also comprises AC power frequency motor, and described AC power frequency motor is connected with AC network in described factory.
7. the system as claimed in claim 1, is characterized in that, in described factory, AC network to comprise in factory AC network low pressure stage electrical network in AC network high pressure section electrical network and factory; And/or
In described factory, direct current network to comprise in factory direct current network low pressure stage electrical network in direct current network high pressure section electrical network and factory.
8. the system as claimed in claim 1, is characterized in that, described system also comprises AC converter and ac variable-frequency electric motor, wherein,
Described AC converter is connected with AC network in described factory, and the AC power frequency electricity of AC network input in described factory is converted to alternating-current variable frequency power by described AC converter;
Described ac variable-frequency electric motor is connected with described AC converter, and ac variable-frequency electric motor described in described AC frequency conversion electric drive.
9. the system as claimed in claim 1, is characterized in that, described alternating current generating sets is heavy-duty generator group.
10. a method for speed governing is carried out to station service electrical system described in claim 1, it is characterized in that, use DC frequency-changing device and DC frequency-changing motor to carry out speed governing.
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| CN105048509B (en) | 2018-09-21 |
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