CN105048509B - Station service electrical system equipped with DC frequency-changing device and DC frequency-changing motor - Google Patents
Station service electrical system equipped with DC frequency-changing device and DC frequency-changing motor Download PDFInfo
- Publication number
- CN105048509B CN105048509B CN201510567749.9A CN201510567749A CN105048509B CN 105048509 B CN105048509 B CN 105048509B CN 201510567749 A CN201510567749 A CN 201510567749A CN 105048509 B CN105048509 B CN 105048509B
- Authority
- CN
- China
- Prior art keywords
- frequency
- factory
- changing
- grid
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Landscapes
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to a kind of station service electrical systems equipped with DC frequency-changing device and DC frequency-changing motor.Specifically, the system comprises DC grid and alternating current generator or alternating current generating sets, AC transformer, the friendship/straight change of current or transformer, DC frequency-changing device and DC frequency-changing motor in AC network in AC network outside factory, factory, factory.The variable-speed operation of electric power factory equipment can be effectively realized using the system, while can significantly reduce the energy loss of generating set, improves the whole efficiency of unit so that the unit is simplified, and has the characteristics that cost is controllable.
Description
Technical field
The present invention relates to power plant equipments, more particularly to a kind of factory equipped with DC frequency-changing device and DC frequency-changing motor
Electricity system.
Background technology
In high power station, according to the variation of unit operation operating mode, electrodynamic pump, wind turbine or compressor in power plant
Etc. equipment generally require variable-speed operation, with achieve the purpose that it is energy saving, improve economy.Existing station service electrical system is become by exchanging
Frequency device realizes the variable-speed operation of equipment with the mode that ac variable-frequency electric motor is combined.Wherein, the work of AC converter is former
Reason is industrial frequency AC to be first changed into direct current, then direct current is changed into frequency-changing AC, this transition process leads to AC converter
There are larger energy loss, conversion efficiency only about 90% significantly reduces system effectiveness and the economic benefit in power plant.This
Outside, since electric power factory equipment rotating speed is different, so AC converter and equipment motor are usually one-to-one configuration, multiple devices are then
More AC converters are needed to configure, it is cumbersome that this allows for electrical system complexity, corresponding cost of investment and operation and maintenance cost
It is consequently increased, system operation reliability reduces, and AC converter quantity is more, and the energy loss brought is then more, right
The negative effect of economy of power plant is more serious.Therefore, it is necessary to be reduced as far as the usage quantity of AC converter, to reduce
The energy loss brought due to the introducing of AC converter, it is ensured that economy when unit variable load operation, and meanwhile it is simple therewith
Change electrical system, improves system operation reliability.
Specifically, Fig. 1-2 is in the prior art using AC converter in such a way that ac variable-frequency electric motor is combined pair
Station service electrical system needs the equipment of variable-speed operation to carry out the system schematic of speed governing, wherein in station service electrical system shown in Fig. 1, sends out
The alternating current that motor group is sent out passes through AC transformer, and a part is delivered to AC network outside factory, supplying power for outside, and another part is straight
It is connected to AC network in factory in succession, station service is provided.For the AC power frequency motor that power is larger, it can be used directly in factory and hand over
Galvanic electricity.But for the motor of AC frequency conversion, then needs to use AC converter, AC power frequency electricity in factory is changed into exchange
Variable-frequency electric, and each equipment motor is both needed to configure a set of AC converter.Accordingly, AC converter cost of investment compared with
Height, electrical system are relative complex.At the same time, the access of AC converter can cause system energy loss, efficiency to decline, to hair
There is negative effect in the economy of power plant.
When power plant is run there are equipment component needs under lower voltage class, in order to meet part low pressure operation
Alternating current in the factory of high pressure is transformed into alternating current in the factory of low pressure, as shown in Figure 2 by the demand of equipment by AC transformer.
AC network both can also pass through AC converter frequency conversion directly to AC power frequency motor in the factory of Fig. 2 mesolows
After drive ac variable-frequency electric motor.It is similar with Fig. 1, either high pressure or low-voltage alternating-current power grid in Fig. 2, to alternating-current variable frequency power
Motivation power when, be required to one-to-one configuration AC converter, thus can cause the energy loss in power supply process, influence be
System efficiency.Moreover, the access of AC converter so that electrical system complexity is cumbersome, operational reliability reduces, investment maintenance cost
It greatly increases.
In order to reduce the required AC converter quantity configured, simplify electrical system, some power plants use the small vapour of speed change
Turbine drives electrical power generators, and each equipment motor of frequency-changing AC electric drive uniformly sent out with the small machine of speed change.But by
In the adjusting of the rotating speed of small turbine realized using throttling into vapour tune valve, flow restriction control necessarily has restriction loss, reduces
Whole efficiency.In addition, although this station service electrical system can simplify electrical system, under same load condition, Suo Youshe
Standby motor shares the same frequency of supply, this means that impossible all motor all operate under peak efficiency, must
It is relatively low so to there is a part of motor running efficiency, reduces the whole efficiency of station service electrical system.Therefore, existing station service electrical system
There are energy loss, the key technical problems such as efficiency is relatively low, electrical system is complicated, frequency converter cost of investment is higher.
In conclusion there is an urgent need in the art to develop a kind of novel to reduce energy loss, improve efficiency, electrical system
It is simplified and the system of the controllable achievable electric power factory equipment variable-speed operation of cost.
Invention content
The purpose of the present invention is to provide a kind of novel reduce energy loss, raising efficiency, electrical systems to be able to letter
The system of change and the controllable achievable electric power factory equipment variable-speed operation of cost.
The first aspect of the present invention provides a kind of station service system equipped with DC frequency-changing device and DC frequency-changing motor
System, the system comprises DC grid and alternating current generators or alternating current generator in AC network in AC network outside factory, factory, factory
Group, AC transformer, the friendship/straight change of current or transformer, DC frequency-changing device and DC frequency-changing motor, wherein
The alternating current generator or alternating current generating sets are connect with the AC transformer, and the AC transformer is by institute
State be delivered to respectively the factory outside after the AC power frequency electricity transformation of alternating current generator or alternating current generating sets output AC network with
AC network in the factory；
The friendship/straight change of current or transformer are connect with AC network in the factory, and the friendship/straight change of current or transformer will
The AC power frequency electricity that AC network inputs in the factory inputs DC grid in the factory after being converted to direct current；
The DC frequency-changing device is connect with DC grid in the factory, and the DC frequency-changing device is by direct current in the factory
The direct current of net input is converted to DC frequency-changing electricity；
The DC frequency-changing motor is connect with the DC frequency-changing device, and direct current described in the DC frequency-changing electric drive becomes
Frequency motor.
In another preferred example, the AC transformer is three-phase or two-phase.
In another preferred example, a friendship/straight change of current or the DC frequency-changing device of transformer configuration one, and one
The DC frequency-changing device can configure one or more DC frequency-changing motor simultaneously.
In another preferred example, the number of units of the DC frequency-changing motor configured in the system is 1-15 platforms, preferably
1-10 platforms are more preferably 1-8 platforms, are most preferably 1-5 platforms.
In another preferred example, the system also includes dc generator, the dc generator and direct currents in the factory
Power grid connects, for exporting direct current.
In another preferred example, the dc generator is shared.
In another preferred example, direct current in factory described in described " shared " DC supply input for referring to the dc generator output
It is used for all equipment being connect with DC grid in the factory after power grid.
In another preferred example, the number of units of the dc generator is 1-15 platforms, preferably 1-10 platforms, is more preferably 1-
8, be most preferably 1-5 platforms.
In another preferred example, described hand over/the straight change of current or transformer and the factory in be equipped with switch A between DC grid；
And/or
Switch B is equipped in the dc generator and the factory between DC grid.
In another preferred example, when switch A is off and switch B in the closure state, the DC generation
DC frequency-changing electricity is converted to drive through the DC frequency-changing device after DC grid in factory described in the DC supply input of machine output
State DC frequency-changing motor.
In another preferred example, when switch A and switch B are in closed state, the dc generator exports straight
Galvanic electricity inputs in the factory and is converted to DC frequency-changing electricity through the DC frequency-changing device to drive the DC frequency-changing after DC grid
Motor and/or through it is described hand over/the straight change of current or transformer be converted to alternating current and input AC network in the factory.
In another preferred example, the system also includes AC power frequency motor, and the AC power frequency motor and institute
AC network in factory is stated to connect.
In another preferred example, the number of units of the AC power frequency motor is 1-15 platforms, preferably 1-10 platforms, more preferably
It is most preferably 1-5 platforms for 1-8 platforms.
In another preferred example, AC network includes alternating current in AC network high pressure section power grid and factory in factory in the factory
Net low pressure stage power grid；And/or
DC grid includes DC grid low pressure stage power grid in DC grid high pressure section power grid and factory in factory in the factory.
In another preferred example, AC network low pressure stage power grid in AC network high pressure section power grid and the factory in the factory
It is connected through AC transformer.
In another preferred example, the AC transformer is by the high-voltage alternating work of AC network high pressure section power grid in the factory
Frequency electricity inputs AC network low pressure stage power grid in the factory after being converted to low-voltage alternating-current power frequency electric.
In another preferred example, the friendship/straight change of current or transformer are connect with AC network low pressure stage power grid in the factory,
And the friendship/straight change of current or transformer are converted to the low-voltage alternating-current power frequency electric that AC network low pressure stage power grid in the factory inputs
DC grid low pressure stage power grid in the factory is inputted after low-voltage DC.
In another preferred example, the DC frequency-changing device is connect with DC grid low pressure stage power grid in the factory, and described
The low-voltage DC of the low pressure stage power grid input of DC grid in the factory is converted to low-voltage direct variable-frequency electric by DC frequency-changing device.
In another preferred example, the DC frequency-changing motor is connect with the DC frequency-changing device, and the low-voltage direct
DC frequency-changing motor described in frequency conversion electric drive.
In another preferred example, the system also includes with AC network low pressure stage power grid is connect in the factory exchange work
Frequency motor.
In another preferred example, the system also includes AC converters and ac variable-frequency electric motor, wherein
The AC converter is connect with AC network in the factory, and the AC converter is by alternating current in the factory
The AC power frequency electricity of net input is converted to alternating-current variable frequency power；
The ac variable-frequency electric motor is connect with the AC converter, and is exchanged and become described in the AC frequency conversion electric drive
Frequency motor.
In another preferred example, the AC converter and the ac variable-frequency electric motor are one-to-one configurations.
In another preferred example, the AC converter is identical with the number of units of the ac variable-frequency electric motor, and described
Number is respectively 1-15 platforms, preferably 1-10 platforms, is more preferably 1-8 platforms, is most preferably 1-5 platforms.
In another preferred example, the alternating current generating sets are heavy-duty generator groups.
In another preferred example, capacity >=300MW of the alternating current generating sets, preferably >=600MW, more preferably >=
900MW, most preferably >=1000MW.
The second aspect of the present invention provides a kind of side of the station service electrical system progress speed governing described to the first aspect of the present invention
Method carries out speed governing using DC frequency-changing device and DC frequency-changing motor.
It should be understood that within the scope of the present invention, above-mentioned each technical characteristic of the invention and have in below (eg embodiment)
It can be combined with each other between each technical characteristic of body description, to form a new or preferred technical solution.As space is limited, exist
This no longer tires out one by one states.
Description of the drawings
Fig. 1-2 be in the prior art using AC converter in such a way that ac variable-frequency electric motor is combined to station service system
The system schematic of the equipment progress speed governing for needing variable-speed operation of system.
Fig. 3 is the signal for the station service electrical system that DC frequency-changing device and DC frequency-changing motor are equipped in the embodiment of the present invention 1
Figure.
Fig. 4 is the signal for the station service electrical system that DC frequency-changing device and DC frequency-changing motor are equipped in the embodiment of the present invention 2
Figure.
Fig. 5 is the signal for the station service electrical system that DC frequency-changing device and DC frequency-changing motor are equipped in the embodiment of the present invention 3
Figure.
Fig. 6 is the signal for the station service electrical system that DC frequency-changing device and DC frequency-changing motor are equipped in the embodiment of the present invention 4
Figure.
Fig. 7 is the signal for the station service electrical system that DC frequency-changing device and DC frequency-changing motor are equipped in the embodiment of the present invention 5
Figure.
Specific implementation mode
The present inventor's in-depth study by long-term, it has unexpectedly been found that use DC frequency-changing device and DC frequency-changing motor
The mode being combined can effectively realize the variable-speed operation of equipment, while using electronic equipped with DC frequency-changing device and DC frequency-changing
The station service electrical system of machine can significantly reduce the energy loss of generating set, improve the whole efficiency of unit so that the unit obtains
With simplification, and have the characteristics that cost is controllable.Based on above-mentioned discovery, inventor completes the present invention.
Term
As used herein, term " frequency conversion " refers to change frequency.Specifically, rotation is realized by way of changing frequency of supply
The technology of equipment operation speed control is called converter technique.The core of converter technique is frequency converter, and frequency of supply is controlled by it
Change realize the adjusting of motor operation rate.Frequency converter includes DC frequency-changing device and AC converter.
As used herein, term " alternating current generator " refers to the generator that the electricity sent out is alternating current, the frequency of usual alternating current
Rate 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 and lowered.
As used herein, term " friendship/straight change of current or transformer ", " friendship/straight transverter " are used interchangeably with " transverter ",
The equipment that alternating current is converted to the equipment of direct current or direct current is converted to alternating current is referred both to, converting front and back voltage can
With raising, reduction or constant.
As used herein, it is that the alternating current of alterable frequency is set that term " DC frequency-changing device ", which refers to input dc power and exports,
It is standby.
As used herein, term " DC frequency-changing motor " refers to the electronic of the rotational frequency variation mating with DC frequency-changing device
Machine.
As used herein, term " dc generator " refers to the generator that the electricity sent out is direct current.
As used herein, it is constant to refer to the constant alternating current of input frequency, working speed for term " AC power frequency motor "
Motor.
As used herein, term " AC converter " refers to the friendship for inputting the constant alternating current of frequency and exporting alterable frequency
The equipment of galvanic electricity.
As used herein, term " ac variable-frequency electric motor " refers to the electronic of the rotational frequency variation mating with AC converter
Machine.
Station service electrical system
The present invention provides a kind of station service electrical system equipped with DC frequency-changing device and DC frequency-changing motor, the system packets
Include AC network outside factory, AC network in factory, DC grid and alternating current generator or alternating current generating sets, AC transformation in factory
Device, the friendship/straight change of current or transformer, DC frequency-changing device and DC frequency-changing motor, wherein
The alternating current generator or alternating current generating sets are connect with the AC transformer, and the AC transformer is by institute
State be delivered to respectively the factory outside after the AC power frequency electricity transformation of alternating current generator or alternating current generating sets output AC network with
AC network in the factory；
The friendship/straight change of current or transformer are connect with AC network in the factory, and the friendship/straight change of current or transformer will
The AC power frequency electricity that AC network inputs in the factory inputs DC grid in the factory after being converted to direct current；
The DC frequency-changing device is connect with DC grid in the factory, and the DC frequency-changing device is by direct current in the factory
The direct current of net input is converted to DC frequency-changing electricity；
The DC frequency-changing motor is connect with the DC frequency-changing device, and direct current described in the DC frequency-changing electric drive becomes
Frequency motor.
In another preferred example, the AC transformer is three-phase or two-phase.
In the present invention, a friendship/straight change of current or the DC frequency-changing device of transformer configuration one, and described in one
DC frequency-changing device can configure one or more DC frequency-changing motor simultaneously.
In another preferred example, the number of units of the DC frequency-changing motor configured in the system is 1-15 platforms, preferably
1-10 platforms are more preferably 1-8 platforms, are most preferably 1-5 platforms.
In the present invention, the system also includes dc generator, the dc generator and DC grids in the factory
Connection, for exporting direct current.
In another preferred example, the dc generator is shared.
In another preferred example, direct current in factory described in described " shared " DC supply input for referring to the dc generator output
It is used for all equipment being connect with DC grid in the factory after power grid.
In another preferred example, the number of units of the dc generator is 1-15 platforms, preferably 1-10 platforms, is more preferably 1-
8, be most preferably 1-5 platforms.
In the present invention, described hand over/the straight change of current or transformer and the factory in be equipped with switch A between DC grid；And/or
Switch B is equipped in the dc generator and the factory between DC grid.
In the present invention, when switch A is off and switch B in the closure state, the dc generator is defeated
It is described straight to drive through the DC frequency-changing device to be converted to DC frequency-changing electricity after DC grid in factory described in the DC supply input gone out
Flow adjustable frequency motor.
In another preferred example, when switch A and switch B are in closed state, the dc generator exports straight
Galvanic electricity inputs in the factory and is converted to DC frequency-changing electricity through the DC frequency-changing device to drive the DC frequency-changing after DC grid
Motor and/or through it is described hand over/the straight change of current or transformer be converted to alternating current and input AC network in the factory.
In the present invention, the system also includes AC power frequency motor, and the AC power frequency motor and the factory
Interior AC network connection.
In another preferred example, the number of units of the AC power frequency motor is 1-15 platforms, preferably 1-10 platforms, more preferably
It is most preferably 1-5 platforms for 1-8 platforms.
In the present invention, AC network includes that AC network is low in AC network high pressure section power grid and factory in factory in the factory
Press section power grid；And/or
DC grid includes DC grid low pressure stage power grid in DC grid high pressure section power grid and factory in factory in the factory.
In another preferred example, AC network low pressure stage power grid in AC network high pressure section power grid and the factory in the factory
It is connected through AC transformer.
In another preferred example, the AC transformer is by the high-voltage alternating work of AC network high pressure section power grid in the factory
Frequency electricity inputs AC network low pressure stage power grid in the factory after being converted to low-voltage alternating-current power frequency electric.
In another preferred example, the friendship/straight change of current or transformer are connect with AC network low pressure stage power grid in the factory,
And the friendship/straight change of current or transformer are converted to the low-voltage alternating-current power frequency electric that AC network low pressure stage power grid in the factory inputs
DC grid low pressure stage power grid in the factory is inputted after low-voltage DC.
In another preferred example, the DC frequency-changing device is connect with DC grid low pressure stage power grid in the factory, and described
The low-voltage DC of the low pressure stage power grid input of DC grid in the factory is converted to low-voltage direct variable-frequency electric by DC frequency-changing device.
In another preferred example, the DC frequency-changing motor is connect with the DC frequency-changing device, and the low-voltage direct
DC frequency-changing motor described in frequency conversion electric drive.
In another preferred example, the system also includes with AC network low pressure stage power grid is connect in the factory exchange work
Frequency motor.
In the present invention, the system also includes AC converters and ac variable-frequency electric motor, wherein
The AC converter is connect with AC network in the factory, and the AC converter is by alternating current in the factory
The AC power frequency electricity of net input is converted to alternating-current variable frequency power；
The ac variable-frequency electric motor is connect with the AC converter, and is exchanged and become described in the AC frequency conversion electric drive
Frequency motor.
In another preferred example, the AC converter and the ac variable-frequency electric motor are one-to-one configurations.
In another preferred example, the AC converter is identical with the number of units of the ac variable-frequency electric motor, and described
Number is respectively 1-15 platforms, preferably 1-10 platforms, is more preferably 1-8 platforms, is most preferably 1-5 platforms.
In the present invention, the alternating current generating sets are heavy-duty generator groups.
In another preferred example, capacity >=300MW of the alternating current generating sets, preferably >=600MW, more preferably >=
900MW, most preferably >=1000MW.
The station service electrical system mainly consists of the following parts：
1) alternating current generator, AC transformer, dc generator；
2) friendship/straight change of current or transformer, for alternating current in factory to be become direct current in factory；
3) DC frequency-changing device, for direct current in factory to be transformed into DC frequency-changing electricity；
4) AC converter, for AC power frequency electricity in factory to be transformed into alternating-current variable frequency power；
5) the DC frequency-changing motor of electric power factory equipment, AC power frequency motor, ac variable-frequency electric motor.
In general, the course of work of AC converter is that the constant alternating current of frequency is first converted to direct current, then again will
Direct current is converted to the alternating current of changeable frequency, and energy need to be converted twice, there is energy loss twice；And DC frequency-changing device is one
The secondary alternating current that direct current is converted to changeable frequency only exists primary energy loss, therefore uses " DC frequency-changing device and direct current
Adjustable frequency motor " replacement " AC converter and ac variable-frequency electric motor " can be effectively energy saving.
Station service electrical system of the present invention, to equipment such as the electrodynamic pumps, wind turbine or compressor that need variable-speed operation, configuration is straight
Adjustable frequency motor is flowed, while public transverter, DC frequency-changing device and/or the small turbine DC generation without restriction loss are set
Machine can meet each equipment variable-speed operation demand to each DC frequency-changing motor.Compared with alternating frequency conversion technique, the technology
The energy loss in conversion process can not only be reduced, energy-efficient purpose is reached, while the sale of electricity income of power plant can also be improved, and
And electrical system is relatively easy reliable, the cost of investment of electrical equipment is also minimized with maintenance cost.In addition, small turbine without
Restriction loss has higher whole efficiency so that electrical system is also more efficient, and then can significantly reduce final equipment
Cost of investment.
Method
The present invention also provides a kind of methods carrying out speed governing to the station service electrical system, use DC frequency-changing device and direct current
Adjustable frequency motor carries out speed governing.
Compared with prior art, the present invention has following major advantage：
(1) electric power factory equipment variable-speed operation can be efficiently realized；
(2) can significantly simplify electrical system, reduce cost of equipment maintenance, improve system operation reliability, reduce investment at
This；
(3) it can effectively avoid the energy loss during AC frequency conversion；
(4) restriction loss is not present, the whole efficiency of system can be significantly improved；
(5) there is energy-saving and environmental protection, high economic benefit.
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In the following examples, the experimental methods for specific conditions are not specified, usually according to conventional strip
Part or according to the normal condition proposed by manufacturer.Unless otherwise stated, otherwise percentage and number are calculated by weight.
Unless otherwise defined, all professional and scientific terms used in text and meaning known to one skilled in the art
Justice is identical.In addition, any method and material similar or impartial to described content can be applied to the method for the present invention.Wen Zhong
The preferred implement methods and materials are for illustrative purposes only.
Embodiment 1
The electricity that alternating current generating sets are sent out is delivered to respectively after AC transformer transformation outside factory and AC network in factory.Factory
Interior AC network each equipment motor into factory.Wherein, factory can be used directly in the larger AC power frequency motor of power
The industrial-frequency alternating current that interior AC network provides.And DC frequency-changing motor is then needed by friendship/straight change of current or transformer and direct current
Frequency converter.First, alternating current in factory is changed into direct current in factory by friendship/straight transverter.It secondly, then will be in factory by DC frequency-changing device
Direct current is changed into DC frequency-changing electricity, for driving DC frequency-changing motor.
In the system, friendship/straight transverter and DC frequency-changing device are shared device, can connect more DC frequency-changings simultaneously
Motor is separately configured without one-to-one.Just because of this, entire electrical system is greatly simplified, the cost of investment of frequency converter
It reduces therewith, and also improves the operational reliability of whole system, the maintenance cost of electrical system is relatively low.Except this it
Outside, due to electrical system relative simplicity, energy loss can substantially reduce caused by transverter, frequency converter, therefore system economy
AC frequency conversion station service electrical system is can be significantly hotter than, the energy-efficient requirement in power plant is met, improves power plant's sale of electricity income.
Embodiment 2
Scheme represented by Fig. 4 is identical as the basic principle of Fig. 3 schemes, the difference is that for operating in low-pressure state
Under equipment motor for, transformer of increasing exchanges as needed provides in low pressure factory AC power frequency electricity.It is handed in the factory of low pressure
Flow power frequency electric can to AC power frequency motor, also can by hand over/straight transverter be converted into direct current in the factory of low pressure, then by
DC frequency-changing motor is supplied after DC frequency-changing device frequency conversion.It is similar with Fig. 3, the transverter and DC frequency-changing of high and low pressure side in Fig. 4
Device is common, can drive more DC frequency-changing motor simultaneously.
Compared with Fig. 2, electrical system shown in Fig. 4 is obviously simplified, and system energy loss is also substantially reduced, power supply
Economy is improved significantly.
Embodiment 3
Scheme shown by Fig. 5 is identical as the basic principle of Fig. 3 schemes, the difference is that still remaining exchange in Fig. 5
Adjustable frequency motor, this section motor still uses AC frequency conversion system, namely still will exchange work in factory by AC converter
Frequency electricity is changed into alternating-current variable frequency power, and ac variable-frequency electric motor is driven 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 existing
Some AC frequency conversion station service electrical systems provide energy-efficient space.For built AC frequency conversion station service electrical system, both may be used
With member-retaining portion ac variable-frequency electric motor, improvement cost is reduced, the efficiency and economy of station service electrical system can also be improved, to
Reach energy-efficient requirement.
Embodiment 4
Scheme shown in Fig. 6 is identical as the basic principle of Fig. 5, the difference is that Fig. 6 increases dc generator.It can be by
Part or all of direct current is provided in dc generator.
Compared with small turbine throttle grverning driving frequency conversion generator provides the technology of variable-frequency electric, the small vapour of dc generator
Turbine has higher whole efficiency without restriction loss.
Embodiment 5
Scheme shown in Fig. 7 is identical as the basic principle of Fig. 6, the difference is that the direct current that dc generator is sent out in Fig. 7
Electricity can pass through friendship/straight transverter and be transmitted back in factory in AC network not only for DC grid in factory.
Scheme in Fig. 7 so that station service power consumption rate is lower, and selling benefit is more.
Generally speaking, the present invention is directed to the technical issues of existing station service electrical system, passes through the equipment to variable-speed operation is needed
Configuring direct current adjustable frequency motor, and newly-increased common friendship/straight transverter and dc generator, provide direct current, then by public affairs
DC frequency-changing device is to each DC frequency-changing motor.This technical solution not only simplifies electrical system, improves and is
System reliability, reduces electrical equipment cost of investment, it is often more important that This solution avoids the energy damages during AC frequency conversion
It loses.Compared with small turbine throttle grverning driving frequency conversion generator provides the technology of variable-frequency electric, the small turbine of dc generator
Without restriction loss, there is higher whole efficiency.The present invention has apparent energy-saving benefit, is improving economy of power plant and sale of electricity
There is stronger competitiveness in terms of income.
Theoretical analysis shows that a 1000MW ultra supercritical unit is as using the present invention, year economize on electricity about 30,000,000 thousand
Watt-hour, direct economy income is up to 12,000,000 yuan or more.
All references mentioned in the present invention is incorporated herein by reference, independent just as each document
It is incorporated as with reference to such.In addition, it should also be understood that, after reading the above teachings of the present invention, those skilled in the art can
To be made various changes or modifications to the present invention, such equivalent forms equally fall within model defined by the application the appended claims
It encloses.
Reference numeral：
1：Alternating current generator
2：AC transformer
3：Friendship/straight change of current or transformer
4：DC frequency-changing device
5：DC frequency-changing motor (more)
6：Dc generator (more)
7：AC power frequency motor (more)
8：AC converter (more)
9：Ac variable-frequency electric motor (more)
Claims (7)
1. a kind of station service electrical system equipped with DC frequency-changing device and DC frequency-changing motor, which is characterized in that the system comprises
AC network outside factory, AC network in factory, DC grid and alternating current generator or alternating current generating sets in factory, AC transformer,
Friendship/straight the change of current or transformer, DC frequency-changing device and DC frequency-changing motor, wherein
The alternating current generator or alternating current generating sets are connect with the AC transformer, and the AC transformer is by the friendship
AC network and described is delivered to outside the factory after stream generator or the AC power frequency electricity transformation of alternating current generating sets output respectively
AC network in factory；
The friendship/straight change of current or transformer are connect with AC network in the factory, and the friendship/straight change of current or transformer will be described
The AC power frequency electricity that AC network inputs in factory inputs DC grid in the factory after being converted to direct current；
The DC frequency-changing device is connect with DC grid in the factory, and the DC frequency-changing device is defeated by DC grid in the factory
The direct current entered is converted to DC frequency-changing electricity；
The DC frequency-changing motor is connect with the DC frequency-changing device, and DC frequency-changing electricity described in the DC frequency-changing electric drive
Motivation；
Also, the system also includes dc generator, the dc generator is connect with DC grid in the factory, for defeated
Go out direct current；
In the friendship/straight change of current or transformer and the factory switch A is equipped between DC grid；And/or
Switch B is equipped in the dc generator and the factory between DC grid；
When switch A be off and switch B in the closure state, the DC supply input institute of dc generator output
It states in factory and is converted to DC frequency-changing electricity through the DC frequency-changing device to drive the DC frequency-changing motor after DC grid.
2. the system as claimed in claim 1, which is characterized in that described in a friendship/straight change of current or transformer configuration one
DC frequency-changing device, and a DC frequency-changing device can configure one or more DC frequency-changing motor simultaneously.
3. the system as claimed in claim 1, which is characterized in that the system also includes AC power frequency motor, and the friendship
Stream power frequency motor is connect with AC network in the factory.
4. the system as claimed in claim 1, which is characterized in that AC network includes AC network high pressure section in factory in the factory
AC network low pressure stage power grid in power grid and factory；And/or
DC grid includes DC grid low pressure stage power grid in DC grid high pressure section power grid and factory in factory in the factory.
5. the system as claimed in claim 1, which is characterized in that the system also includes AC converter and AC frequency conversion are electronic
Machine, wherein
The AC converter is connect with AC network in the factory, and the AC converter is defeated by AC network in the factory
The AC power frequency electricity entered is converted to alternating-current variable frequency power；
The ac variable-frequency electric motor is connect with the AC converter, and alternating-current variable frequency power described in the AC frequency conversion electric drive
Motivation.
6. the system as claimed in claim 1, which is characterized in that the alternating current generating sets are heavy-duty generator groups.
7. a kind of method carrying out speed governing to station service electrical system described in claim 1, which is characterized in that using DC frequency-changing device and
DC frequency-changing motor carries out speed governing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510567749.9A CN105048509B (en) | 2015-09-08 | 2015-09-08 | Station service electrical system equipped with DC frequency-changing device and DC frequency-changing motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510567749.9A CN105048509B (en) | 2015-09-08 | 2015-09-08 | Station service electrical system equipped with DC frequency-changing device and DC frequency-changing motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105048509A CN105048509A (en) | 2015-11-11 |
| CN105048509B true CN105048509B (en) | 2018-09-21 |
Family
ID=54454831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510567749.9A Active CN105048509B (en) | 2015-09-08 | 2015-09-08 | Station service electrical system equipped with DC frequency-changing device and DC frequency-changing motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105048509B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849089A (en) * | 2017-03-24 | 2017-06-13 | 上海申能电力科技有限公司 | A kind of electric energy conversion and switching system, method and its application |
| CN106887992A (en) * | 2017-03-24 | 2017-06-23 | 上海申能电力科技有限公司 | A kind of electric energy conversion of many buses and switching system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201266838Y (en) * | 2008-09-19 | 2009-07-01 | 宝鸡石油机械有限责任公司 | Drill/service rig power system with DC bus bar power supply |
| CN102751751A (en) * | 2012-04-24 | 2012-10-24 | 中国石油大学(北京) | Alternating current bus electronic control system of electric workover rig |
| CN104649478A (en) * | 2013-11-20 | 2015-05-27 | 中国电力工程顾问集团公司 | Wind power isolated grid sea water desalination system |
| CN204967284U (en) * | 2015-09-08 | 2016-01-13 | 中国电力工程顾问集团华东电力设计院有限公司 | Station service electrical system with dc -inverter ware and dc -inverter motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010013783A1 (en) * | 2008-08-01 | 2010-02-04 | パナソニック電工株式会社 | Power distribution system |
-
2015
- 2015-09-08 CN CN201510567749.9A patent/CN105048509B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201266838Y (en) * | 2008-09-19 | 2009-07-01 | 宝鸡石油机械有限责任公司 | Drill/service rig power system with DC bus bar power supply |
| CN102751751A (en) * | 2012-04-24 | 2012-10-24 | 中国石油大学(北京) | Alternating current bus electronic control system of electric workover rig |
| CN104649478A (en) * | 2013-11-20 | 2015-05-27 | 中国电力工程顾问集团公司 | Wind power isolated grid sea water desalination system |
| CN204967284U (en) * | 2015-09-08 | 2016-01-13 | 中国电力工程顾问集团华东电力设计院有限公司 | Station service electrical system with dc -inverter ware and dc -inverter motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105048509A (en) | 2015-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201388064Y (en) | Megawatt variable-speed wind turbine generator system employing polyphase generators and multilevel convertors | |
| CN103023391A (en) | Soft-starting current-limiting compensation and harmonic filtering integration method of high-voltage high-power motor | |
| CN101635466A (en) | Megawatt-level variable-speed wind-power unit adopting multiphase generator and multilevel converter | |
| CN103701309A (en) | Alternating-direct current power supply system for variable frequency equipment and variable frequency air conditioner | |
| CN105048509B (en) | Station service electrical system equipped with DC frequency-changing device and DC frequency-changing motor | |
| CN211930537U (en) | Frequency conversion system for motor | |
| CN207081818U (en) | A kind of common DC bus frequency control pilot system | |
| CN204967284U (en) | Station service electrical system with dc -inverter ware and dc -inverter motor | |
| CN211046216U (en) | Electric drive power integrated system of drilling system | |
| CN107925249A (en) | The method and system that the network voltage of distributed energy resource is adjusted | |
| CN105098973A (en) | Power plant auxiliary equipment variable-frequency power source system based on water-feeding pump driving steam turbine driving | |
| CN206743142U (en) | Brushless dual-feed motor arrangements for speed regulation with three full-control type current transformers | |
| CN109210655A (en) | Air-conditioning equipment and electric energy processing method for air-conditioning equipment | |
| CN205377311U (en) | Modified device is not shut down to variable speed constant frequency generating set trouble | |
| CN204244087U (en) | A kind of motor test electric supply installation with transformer and filter | |
| CN105785176B (en) | A kind of more specification full-power wind power converter test platforms | |
| CN200956563Y (en) | High-voltage AC winding motor rotor variable frequency speed-regulating control system | |
| CN113991637A (en) | Direct-current micro-grid power transmission system applied to oil drilling machine | |
| CN201309432Y (en) | Single/three-phase power converter matched with electric railway contact net | |
| CN209246288U (en) | Air-conditioning equipment | |
| CN206575345U (en) | A kind of electric supply installation of the magnetic suspension air blower with soft start | |
| CN205986141U (en) | Air conditioning unit's supply circuit | |
| CN206743141U (en) | A kind of brushless dual-feed motor arrangements for speed regulation of high reliability | |
| CN206389114U (en) | Traction power supply supply unit | |
| CN106411148B (en) | A kind of Traction Substation of Electric Railway hands over straight friendship type power supply system structure from electricity consumption |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |