CN106379154A - Hybrid driving system - Google Patents
Hybrid driving system Download PDFInfo
- Publication number
- CN106379154A CN106379154A CN201610827222.XA CN201610827222A CN106379154A CN 106379154 A CN106379154 A CN 106379154A CN 201610827222 A CN201610827222 A CN 201610827222A CN 106379154 A CN106379154 A CN 106379154A
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- Prior art keywords
- steam turbine
- driving means
- power
- equipment
- frequency conversion
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K3/00—Arrangement or mounting of steam or gaseous-pressure propulsion units
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Control Of Turbines (AREA)
Abstract
The invention provides a hybrid driving system which comprises power equipment and a hybrid driving device, wherein the hybrid driving device comprises a variable-frequency motor driving device and a steam turbine driving device; and the steam turbine driving device and the variable-frequency motor driving device are respectively connected with the power equipment in a driving manner. The hybrid driving device comprising the variable-frequency motor driving device and the steam turbine driving device drives the power equipment, so that precise control and real-time control over the rotating speed of the power equipment can be realized conveniently by fully using the advantages of high rotating speed controllability, capability of adjusting the speed in real time and stable rotating speed operation of the variable-frequency motor driving device, and the total energy consumption can be reduced by fully using waste steam energy which is generated by the steam turbine driving device such as a waste heat boiler and serves as driving energy. Meanwhile, the variable-frequency motor driving device and the steam turbine driving device are backup of each other; and no matter which driver fails, the power equipment can continuously operate, so that the operation stability is improved.
Description
Technical field
The present invention relates to energy-saving and emission-reduction field, in particular to a kind of hybrid electric drive system.
Background technology
In existing a lot of production technologies it is impossible to the waste heat ruing out of and can not collect fuel produce often through boiler big
The steam of amount, and steam is applied to steam driven equipment can save electric energy.However, existing many equipment, especially big work(
Rate equipment, if relying on simple steam to drag, not only starting time is slow, and corresponding speed governing speed is slow, unstable to vapour source
Obvious with load reacting condition, and it is difficult to accurately speed controlling., much produce work taking high power plant as a example
The rotating speed control accuracy requiring high power plant in skill is high, stabilization of speed and as much as possible using inexpensive energy.
For powerful device, if adopting motor drag, power consumption is high, and operating cost is also very high.Although working as
Front also have the equipment dragging motor and steam turbine mixing, but is only limitted to power frequency state, and motor only exists in four-quadrant operation, does not carry out
Electric machine speed regulation, does not carry out steam turbine speed governing yet, that is, only exist in and run under power frequency constant speed mode, and which can not meet dragged setting
Standby real-time speed regulating requires.
Thus, need exist for the dragging power of powerful device is improved, to meet powerful device to real-time
The requirement of quick speed governing.
Content of the invention
Present invention is primarily targeted at providing a kind of hybrid power to drive, so that power-equipment can be according to duty requirements
Carry out real-time speed governing.
To achieve these goals, according to an aspect of the invention, it is provided a kind of hybrid electric drive system, this mixes
Close power-driven system to include：Power-equipment；And hybrid drive, drive including frequency conversion motor driving means and steam turbine
Dynamic device, steam turbine driving means and frequency conversion motor driving means respectively with power-equipment drive connection.
Further, frequency conversion motor driving means include：Frequency conversion motor, frequency conversion motor and power-equipment drive connection；With
And converter, converter electrically connected with frequency conversion motor.
Further, frequency conversion motor driving means also include：First coupling device, the first coupling device is arranged on power and sets
For and frequency conversion motor between.
Further, steam turbine driving means include：Steam turbine, steam turbine and power-equipment drive connection；And steam tune
Section valve, steam control valve is arranged between steam turbine and vapour source.
Further, steam turbine driving means also include：First deceleration device, the first deceleration device be arranged on power-equipment with
Between steam turbine.
Further, power-equipment drives power-equipment for two ends, and first end is connected with frequency conversion motor driving means, the
Two ends are connected with steam turbine driving means.
Further, power-equipment is single-ended drive power-equipment, and power-equipment passes through frequency conversion motor driving means and vapour
Machine actuating device is connected.
Further, hybrid drive also includes the second coupling device, and the second coupling device is arranged on variable-frequency electric
Between machine actuating device and steam turbine driving means.
Further, steam turbine driving means include：Second deceleration device, steam turbine driving means pass through the second deceleration device with
Second coupling device is connected.
Further, hybrid drive also includes：Control device, control device is used for detecting that frequency conversion motor drives
The change of the output of device, and steam turbine driving is increasedd or decreased according to the change of the output of frequency conversion motor driving means
The output of device.
Application technical scheme, by the current power set driving power-equipment work are changed to including frequency conversion
Motor driver and the hybrid drive of steam turbine driving means, are both easy to make full use of frequency conversion motor driving means and turn
Fast controllability is high, can real-time speed regulating and the stable advantage of rotating speed realizing being precisely controlled and in real time to power-equipment rotating speed
Control, can make full use of again and can be reduced always as the steam turbine driving means of driving energy using the exhaust steam of the generations such as waste heat boiler
Energy consumption.Thus, this power-equipment had both enabled good quick speed-regulating function, can make full use of steam-energy again and drive.Meanwhile,
Frequency conversion motor driving means and steam turbine driving means are also standby each other, and arbitrary driving is broken down, and power-equipment all can continue to transport
OK, improve operation stability.
Brief description
The Figure of description constituting the part of the application is used for providing a further understanding of the present invention, and the present invention shows
Meaning property embodiment and its illustrate for explaining the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 shows the structural representation of the hybrid electric drive system in a kind of preferred embodiment of the present invention；
Fig. 2 shows the structural representation of the hybrid electric drive system in another kind of preferred embodiment of the present invention.
Above-mentioned accompanying drawing includes the following drawings labelling：
10th, power-equipment；20th, frequency conversion motor driving means；30th, steam turbine driving means；
21st, frequency conversion motor；22nd, converter；23rd, the first coupling device；24th, the second coupling device；
31st, steam turbine；32nd, steam control valve；33rd, the first deceleration device；34th, the second deceleration device.
Specific embodiment
It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can phases
Mutually combine.To describe the present invention below in conjunction with embodiment in detail.
As background section is previously mentioned, power-equipment of the prior art, such as high-power blower, high powered water pump etc.
It is difficult to the requirement of quick speed governing when output is larger, in order to improve this situation, typically real in the application one kind
Apply in mode, there is provided a kind of hybrid power drives, as depicted in figs. 1 and 2, this hybrid power drives and includes：Power-equipment 10
And driving the hybrid drive of power-equipment 10 work, hybrid drive includes frequency conversion motor driving means
20 and steam turbine driving means 30, frequency conversion motor driving means 20 and steam turbine driving means 30 are driven even with power-equipment 10 respectively
Connect.
By the current power set driving power-equipment work are changed to drive including frequency conversion motor driving means and steam turbine
The hybrid drive of dynamic device, is both easy to make full use of frequency conversion motor rotational speed of driving unit controllability height, can adjust in real time
Speed and the stable advantage of rotating speed realizing being precisely controlled and real-time control to power-equipment rotating speed, can make full use of again with
The exhaust steam of the generations such as waste heat boiler can reduce total energy consumption as the steam turbine driving means of driving energy.Thus, this power
Equipment had both enabled good quick speed-regulating function, can make full use of steam-energy again and drive.Meanwhile, frequency conversion motor driving means and
Steam turbine driving means are also standby each other, and arbitrary driving is broken down, and power-equipment all can continue to run with, and improve stable
Property.
Above-mentioned power-equipment is suitable for that used needs in any technique productions are real-time, the output power range of quick speed governing
Wider equipment, includes but are not limited to blower fan, water pump etc..
Frequency conversion motor driving means 20 in above-mentioned power-equipment can be using multiple units in existing frequency conversion motor 21 assembly
Part, as long as be capable of carrying out real-time speed governing to power-equipment 10.In a kind of preferred embodiment of the application, such as scheme
Shown in 1, above-mentioned frequency conversion motor driving means 20 include：Frequency conversion motor 21 and converter 22, frequency conversion motor 21 and power-equipment 10
It is connected；Converter 22 is connected with frequency conversion motor 21.
In above preferred embodiment, the function of converter 22 is to carry out electric energy supply and speed controlling to frequency conversion motor 21.
Because alternating current generator mechanical performance is hard, speed governing is quick and stable, and converter 22 controls frequency conversion motor 21 rotating speed to enable fast velocity modulation
Whole and stability contorting, thus realize quick rotating speed and the stabilized (steady-state) speed of power-equipment.Additionally, when converter 22 is four-quadrant frequency conversion
During device, in certain special cases, can also be worked with generating state.Converter 22 can range of operation wide, control is easier
Realize.And frequency conversion motor 21 can be driven to power-equipment 10 for a long time under the running status of variable-ratio it is thus possible to real
When rapidly regulate and control power-equipment 10 rotating speed, meet the power output demand under the different operating mode of power-equipment 10.
Under different work condition states, the demand of output is had differences because power-equipment 10 operates in, work as power-equipment
10 rotating speeds change (i.e. output changes) when, the operating load of power-equipment 10 changes, frequency conversion motor 21
The load being undertaken with steam turbine driving means 30 is also required to respective change.Above-mentioned power-equipment adopts hybrid drive
Purpose is by the mutual supplement with each other's advantages of two kinds of power set, in the case that overall energy consumption is relatively low, is run not according to power-equipment 10
With the demand to output under work condition state, carry out the rotating speed of real-time adjustment power-equipment 10.To achieve these goals, at this
Apply in a preferred embodiment, pass through converter 22 between above-mentioned steam turbine driving means 30 and frequency conversion motor driving means 20 phase defeated
The frequency variation signal going out connects.
In above preferred embodiment, when power-equipment 10 rotating speed changes (i.e. output changes), due to
Frequency conversion motor 21 steam turbine driving means 30 relatively have harder mechanical property, and power-equipment 10 speed loop follows frequency conversion motor
21 rotation speed change.Now, if power-equipment 10 speed increases, frequency conversion motor 21 power output ratio increases, steam turbine driving means
30 power output ratio reduces.After frequency conversion motor 21 velocity-stabilization, then steam turbine driving means 30 are then defeated according to converter 22
The frequency variation signal going out, adjusts the power output ratio of steam turbine driving means 30 again so that the power output ratio of frequency conversion motor 21
Example suitably reduces or is reduced to a certain setting value.If power-equipment 10 speed reduces, the power output ratio of frequency conversion motor 21 subtracts
Little；If the output of steam turbine driving means 30 is actually needed power beyond power-equipment 10, and now at frequency conversion motor 21
In generating state, now can still ensure that stable by converter 22 (as four-quadrant frequency converter) by back electrical energy to electrical network
Rotation speed requirements.
In a kind of preferred embodiment of the application, above-mentioned frequency conversion motor driving means 20 also include：First coupling device 23,
First coupling device 23 is arranged between power-equipment 10 and frequency conversion motor 21.For coupling the change of frequency conversion motor driving means 20
Frequency motor 21 and power-equipment 10, with the running speed of real-time, quick regulation and control power-equipment 10.
In a preferred embodiment, as shown in figure 1, above-mentioned steam turbine driving means 30 include：Steam turbine 31, steam turbine 31 with
Power-equipment 10 is connected；And adjust the steam control valve 32 of steam flow in steam turbine 31.
In above preferred embodiment, during frequency conversion motor 21 with steam turbine 31 combination drive power-equipment 10, become
Frequency device 22 is adjusted by frequency and changes frequency conversion motor 21 rotating speed, and steam control valve 32 makes to become by adjusting steam turbine 31 throttle flow
The output that frequency motor 21 undertakes is in range of set value.When power-equipment 10 rotation speed change, power-equipment 10 load occurs
Change, frequency conversion motor 21 and steam turbine 31 undertake load and also change, in the process, because frequency conversion motor 21 speed governing is fast,
Can quick response meet the change of power-equipment 10 load, now, simply the power of frequency conversion motor 21 and steam turbine 31 is defeated
Go out ratio to change, but impact is had no on the speed stability of power-equipment 10.Therefore, Dual Drive is mutually matched self adaptation,
Can quickly speed governing, reduce energy consumption, can prevent driving malfunction from leading to power-equipment 10 to be shut down again, improve power-equipment 10 and run
Stabilizer.
In above preferred embodiment, in start, steam turbine 31 needs to preheat, and the time is long, thus now using variable-frequency electric
Machine 21 starts power-equipment 10, adjusts the quantity of steam of supply steam turbine 31 so that steam turbine 31 is carried out by steam control valve 32
Pre-heating temperature elevation, and it is stepped up the steam delivery volume of steam turbine 31, until after the completion of warm, entering normal operation.Shut down
When, steam turbine 31 nor suddenly parking.Frequency conversion motor 21 stops, and after converter 22 stops powering to frequency conversion motor 21, passes through
To steam turbine 31 jiggering, slow cooling, until temperature drops to steam turbine 31 and can stop temperature steam turbine 31 turning motor.
In the application another kind preferred embodiment, above-mentioned steam turbine driving means 30 also include the first deceleration device 33, the
One deceleration device 33 is arranged between power-equipment 10 and steam turbine driving means 30.Above-mentioned first deceleration device 33 is that steam turbine is driven
The rotating speed of dynamic device 30 is slowed down, to adapt to the operational requirements scope of power-equipment 10.
In above-mentioned power-equipment, power-equipment 10, for this hybrid drive, both can have been driven real by both-end
Now can also be realized by single-ended drive.In a preferred embodiment, as shown in figure 1, above-mentioned power-equipment 10 drives for two ends
Dynamic power-equipment 10, first end is connected with frequency conversion motor driving means 20, and the second end is connected with steam turbine driving means 30.Another
In preferred embodiment, as shown in Fig. 2 above-mentioned power-equipment 10 is single-ended drive power-equipment 10, power-equipment 10 passes through frequency conversion
Motor driver 20 is connected with steam turbine driving means 30.
When power-equipment 10 is single-ended drive, hybrid drive also includes：Second coupling device 24, second even
Shaft device 24 is arranged between frequency conversion motor driving means 20 and steam turbine driving means 30.This second coupling device 24 is used for connecting
Frequency conversion motor driving means 20 and steam turbine driving means 30, so that the rotating speed of steam turbine driving means 30 and frequency conversion motor driving means
20 rotating speed is adapted.Additionally, as shown in Fig. 2 as needed hybrid drive can also frequency conversion motor 21 with dynamic
Extra coupling device, the such as the 3rd coupling device are set between power equipment 10.
Preferably, steam turbine driving means 30 also include the second deceleration device 34, and steam turbine driving means 30 are passed through second and slowed down
Device 34 is connected with the second coupling device 24.Above-mentioned second deceleration device 34 is that the rotating speed to steam turbine driving means 30 subtracts
Speed, to adapt to the operational requirements scope of power-equipment 10, and turning by the second deceleration device 34 and frequency conversion motor driving means
Speed matches.
Preferably, it is additionally provided with control device between above-mentioned steam turbine driving means 30 and frequency conversion motor driving means 20 phase,
This control device accepts the frequency variation signal of converter 22 output, and the output work to steam turbine driving means 30 according to this frequency variation signal
Rate sends instruction, so that the output of steam turbine driving means 30 can be with the change of the power output ratio of frequency conversion motor 21
Change and change.
When power-equipment 10 rotation speed change, power-equipment 10 load changes, and frequency conversion motor 21 and steam turbine drive dress
Put 30 loads being undertaken also to change.In the process, power-equipment 10 speed is regulated and controled by frequency conversion motor 21, to work as power
After equipment 10 velocity-stabilization, then control system is passed to by the frequency variation signal that converter 22 exports, and vapour is controlled by control system
The power proportions of machine actuating device 30 output are adapted with the power proportions of frequency conversion motor 21 output.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect：
By the current power set driving power-equipment work are changed to drive including frequency conversion motor driving means and steam turbine
The hybrid drive of dynamic device, is both easy to make full use of frequency conversion motor rotational speed of driving unit controllability height, can adjust in real time
Speed and the stable advantage of rotating speed realizing being precisely controlled and real-time control to power-equipment rotating speed, can make full use of again with
The exhaust steam of the generations such as waste heat boiler can reduce total energy consumption as the steam turbine driving means of driving energy.Thus, this mixing
Power drive had both enabled good quick speed-regulating function, can make full use of steam-energy again and drive.
Meanwhile, frequency conversion motor driving means and steam turbine driving means are also standby each other, and arbitrary driving is broken down, and mixing is dynamic
Power drives and all can continue to run with, and improves operation stability.During above-mentioned frequency conversion motor dead electricity, disconnect frequency conversion motor power supply circuits,
Remaining steam turbine driving means still can drive power-equipment to run, although now speed adjusting performance lowers.When vapour in steam turbine driving means
When the vapour source of turbine disconnects, though failing to utilize steam-energy under the conditions of this, power-equipment still can be by the type of drive of frequency conversion motor
Run.It can be seen that, the application drives the hybrid power that power-equipment runs to drive by hybrid drive, can not only carry
High hybrid power drive in normal state quick real-time speed regulating is realized with relatively low energy consumption, and abnormality can also be prevented
Under operation stability.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of hybrid electric drive system is it is characterised in that described hybrid electric drive system includes：
Power-equipment (10)；And
Hybrid drive, including frequency conversion motor driving means (20) and steam turbine driving means (30), described steam turbine drives
Device (30) and described frequency conversion motor driving means (20) respectively with described power-equipment (10) drive connection.
2. hybrid electric drive system according to claim 1 is it is characterised in that described frequency conversion motor driving means (20)
Including：
Frequency conversion motor (21), described frequency conversion motor (21) and described power-equipment (10) drive connection；And
Converter (22), described converter (22) is electrically connected with described frequency conversion motor (21).
3. hybrid electric drive system according to claim 2 is it is characterised in that described frequency conversion motor driving means (20)
Also include：
First coupling device (23), described first coupling device (23) is arranged on described power-equipment (10) and described frequency conversion motor
(21) between.
4. hybrid electric drive system according to claim 1 is it is characterised in that described steam turbine driving means (30) are wrapped
Include：
Steam turbine (31), described steam turbine (31) and described power-equipment (10) drive connection；And
Steam control valve (32), described steam control valve (32) is arranged on described steam turbine (31) and vapour source between.
5. hybrid electric drive system according to claim 4 is it is characterised in that described steam turbine driving means (30) are also wrapped
Include：
First deceleration device (33), described first deceleration device (33) is arranged on described power-equipment (10) and described steam turbine
(31) between.
6. hybrid electric drive system according to claim 1 is it is characterised in that described power-equipment (10) drives for two ends
Dynamic power-equipment (10), first end is connected with described frequency conversion motor driving means (20), and the second end drives dress with described steam turbine
Put (30) to be connected.
7. hybrid electric drive system according to claim 1 is it is characterised in that described power-equipment (10) is single-ended drive
Dynamic power-equipment (10), described power-equipment (10) is by described frequency conversion motor driving means (20) and described steam turbine driving means
(30) it is connected.
8. hybrid electric drive system according to claim 7 is it is characterised in that described hybrid drive also wraps
Include the second coupling device (24), described second coupling device (24) is arranged on described frequency conversion motor driving means (20) and described vapour
Between machine actuating device (30).
9. hybrid electric drive system according to claim 8 is it is characterised in that described steam turbine driving means (30) are wrapped
Include：Second deceleration device (34), described steam turbine driving means (30) pass through described second deceleration device (34) and the second connecting shaft dress
Put (24) to be connected.
10. according to claim 1 hybrid electric drive system it is characterised in that described hybrid drive also wraps
Include：Control device, described control device is used for detecting the change of the output of described frequency conversion motor driving means (20), and root
Increased or decrease the defeated of described steam turbine driving means (30) according to the change of the output of described frequency conversion motor driving means (20)
Go out power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610827222.XA CN106379154A (en) | 2016-09-12 | 2016-09-12 | Hybrid driving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610827222.XA CN106379154A (en) | 2016-09-12 | 2016-09-12 | Hybrid driving system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106379154A true CN106379154A (en) | 2017-02-08 |
Family
ID=57935705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610827222.XA Pending CN106379154A (en) | 2016-09-12 | 2016-09-12 | Hybrid driving system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106379154A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109098949A (en) * | 2018-06-26 | 2018-12-28 | 沈阳鼓风机集团安装检修配件有限公司 | A kind of compressor assembly and control method of the double drives of vapour electricity |
| CN109268079A (en) * | 2018-09-30 | 2019-01-25 | 西安陕鼓动力股份有限公司 | The duty control method of steam turbine in Rotation Process drops in SHRT unit frequency-conversion |
| CN109322714A (en) * | 2018-09-30 | 2019-02-12 | 西安陕鼓动力股份有限公司 | SHRT unit frequency-conversion rises the duty control method of steam turbine in Rotation Process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109098949A (en) * | 2018-06-26 | 2018-12-28 | 沈阳鼓风机集团安装检修配件有限公司 | A kind of compressor assembly and control method of the double drives of vapour electricity |
| CN109268079A (en) * | 2018-09-30 | 2019-01-25 | 西安陕鼓动力股份有限公司 | The duty control method of steam turbine in Rotation Process drops in SHRT unit frequency-conversion |
| CN109322714A (en) * | 2018-09-30 | 2019-02-12 | 西安陕鼓动力股份有限公司 | SHRT unit frequency-conversion rises the duty control method of steam turbine in Rotation Process |
| CN109268079B (en) * | 2018-09-30 | 2020-11-20 | 西安陕鼓动力股份有限公司 | Load control method of steam turbine in variable-frequency and rotational-speed-reduction process of SHRT unit |
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