CN211670800U - Waste heat power generation system based on unstable steam source - Google Patents
Waste heat power generation system based on unstable steam source Download PDFInfo
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- CN211670800U CN211670800U CN202020560692.6U CN202020560692U CN211670800U CN 211670800 U CN211670800 U CN 211670800U CN 202020560692 U CN202020560692 U CN 202020560692U CN 211670800 U CN211670800 U CN 211670800U
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- frequency converter
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- 238000010248 power generation Methods 0.000 title claims abstract description 37
- 239000002918 waste heat Substances 0.000 title claims abstract description 10
- 238000002955 isolation Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000001360 synchronised effect Effects 0.000 claims description 10
- 230000005284 excitation Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- Control Of Eletrric Generators (AREA)
Abstract
The utility model relates to a small-size turbo generator set. The purpose is to provide a waste heat power generation system based on an unstable steam source, and the system can safely and reliably operate and generate power under the unstable condition of the steam source. The technical scheme is as follows: the waste heat power generation system based on the unstable steam source comprises a variable frequency inlet wire cabinet connected with a bus at the generator end, a voltage transformer cabinet, an electric power generation cabinet and a three-phase motor driven by a steam turbine and connected with the variable frequency inlet wire cabinet; the method is characterized in that: the system also comprises an isolation phase-shifting transformer and a high-voltage frequency converter which are sequentially connected between the variable-frequency incoming line cabinet and the three-phase motor.
Description
Technical Field
The utility model relates to a small-size turbo generator set specifically is a waste heat power generation system based on unstable vapour source.
Background
In a small steam turbine generator unit with a generating capacity generally ranging from 500 to 5000KW, a steam turbine is used as a prime mover of the generator, and the amount of steam entering the steam turbine is controlled by a debugging system of the steam turbine to control the amount of power generation of the generator. At present, the traditional small-sized steam turbine power generation system roughly comprises the following subsystems and equipment: the system comprises a turbo generator set, auxiliary equipment of the turbo generator set, a high-voltage primary power distribution system (comprising PT, CT and switch equipment), an excitation and excitation adjusting system, synchronous grid connection, generator protection control and measurement. If a user can meet the power factor assessment requirement of a power grid, a simpler asynchronous motor can be considered to replace a synchronous generator, and excitation and an excitation regulation system in the subsystem can be omitted, so that the whole power generation system is simplified.
However, the premise is that a relatively stable steam source is required for power generation by adopting a synchronous generator or an asynchronous motor. With a traditional power generation mode, if the fluctuation of a steam source of a steam turbine is large (the steam quantity is small and large), the rotating speed of a steam turbine generator unit is unstable, the phenomenon that the rotating speed fluctuation is too large before the unit is connected to the grid can be shown, so that the unit is not easy to be connected to the grid, potential safety hazards exist in the unit, such as rotor overspeed, the phenomenon that the load fluctuation is shown when the unit is connected to the grid is light, the stability of a power grid is influenced when the steam turbine generator unit runs in reverse power, and the power generation state is changed into an electric state, so that the steam turbine runs in blast air and.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming not enough among the above-mentioned background art, providing a waste heat power generation system based on unstable vapour source, this system should be able to move the electricity generation safely and reliably under the unstable condition in vapour source.
The technical scheme of the utility model is that:
the waste heat power generation system based on the unstable steam source comprises a variable frequency inlet wire cabinet connected with a bus at the generator end, a voltage transformer cabinet, an electric power generation cabinet and a three-phase motor driven by a steam turbine and connected with the variable frequency inlet wire cabinet; the method is characterized in that: the system also comprises an isolation phase-shifting transformer and a high-voltage frequency converter which are sequentially connected between the variable-frequency incoming line cabinet and the three-phase motor.
An isolating switch is arranged between the isolating phase-shifting transformer and the high-voltage frequency converter; and a change-over switch is arranged between the high-voltage frequency converter and the three-phase motor.
The three-phase motor is provided with a synchronous voltage transformer.
The utility model has the advantages that:
along with the rapid development of the high-voltage frequency conversion technology and the mature application of the four-quadrant transmission technology, the utility model discloses increase isolation phase-shifting transformer and high-voltage inverter in original traditional power generation mode, utilize functions such as the four-quadrant transmission technology and the runaway start of high-voltage inverter, provide safe and reliable power generation mode for the steam turbine under the unstable condition of steam source, and supporting electric high-voltage distribution, synchronization, generator protection control, measurement compare in conventional mode small-size unit power generation scheme nearly the same; furthermore, the utility model discloses can also improve power generation system's factor of safety, along with the reduction of high-voltage inverter price, more have better market prospect.
Drawings
Fig. 1 is a schematic view of the connection relationship of the present invention.
Fig. 2 is a schematic diagram of a connection relationship of the prior art.
Detailed Description
The present invention will be further described with reference to the drawings attached to the specification, but the present invention is not limited to the following embodiments.
As shown in figure 1, the waste heat power generation system based on the unstable steam source comprises a variable frequency incoming line cabinet, a voltage mutual inductance cabinet, an electric power generation cabinet, a three-phase motor, an isolation phase-shifting transformer and a high-voltage frequency converter. The variable frequency incoming line cabinet, the voltage transformer cabinet and the electric power generation cabinet are connected with a generator end bus. The isolation phase-shifting transformer and the high-voltage frequency converter are sequentially connected between the variable-frequency incoming line cabinet and the three-phase motor. The three-phase motor is a three-phase asynchronous motor, and the three-phase motor is provided with a synchronous voltage transformer. And an isolating switch is arranged between the isolating phase-shifting transformer and the high-voltage frequency converter. And a change-over switch is arranged between the high-voltage frequency converter and the three-phase motor.
The isolation phase-shifting transformer and the high-voltage frequency converter are integrally arranged and installed in an indoor cabinet, the upper end of the isolation phase-shifting transformer is connected with a high-voltage power supply (10.5KV or 6.3KV) of the variable-frequency incoming line cabinet, the isolation phase-shifting transformer and the high-voltage frequency converter are connected in the cabinet through an isolation switch, and the high-voltage frequency converter is connected with a three-phase motor through a change-over switch and a cable. Other required equipment (such as a generator protection control measuring device, a synchronizing device, a current transformer and the like) in the power generation system and a traditional power generation mode.
The isolation phase-shifting transformer is dry, and the secondary side multi-winding corresponds to the IGBT power unit of the high-voltage frequency converter. The high-voltage frequency converter adopts a high-high structure, and units are connected in series in a multi-level mode. The high-voltage frequency converter has an intelligent runaway starting function of rotating speed tracking. The high-voltage frequency converter can constantly detect the rotating speed and the residual magnetism of the three-phase motor, can be stably restarted no matter what the rotating speed and the residual magnetism voltage of the three-phase motor are, and can also automatically adapt to the starting of a runaway under any rotating speed. It is this function that ensures that the unit will not run into the air when the air volume suddenly increases during the start-up process, because: 1. the relatively infinite power grid drags the generator (three-phase motor); 2. the capacity of the generator (three-phase motor) is selected by considering the working condition of the maximum steam quantity, and the generator (three-phase motor) has short-time overload capacity. The most dangerous is the runaway accident caused by the accidental trip, and the runaway starting function of the high-voltage frequency converter can also play a role in controlling the rotating speed, so that the power generation system is safe and reliable.
The utility model discloses a power generation process as follows:
switching on a generator variable frequency switch of a variable frequency incoming line cabinet to electrify a high-voltage frequency converter, firstly, the high-voltage frequency converter softly starts a turbo generator set (a three-phase motor) to reach a certain rotating speed (for example, 1000 revolutions per minute), and then a steam turbine starts air inlet and speed rise (the frequency of the steam turbine is 0-3000 revolutions per minute and corresponds to 0-50HZ of the high-voltage frequency converter); the high-voltage frequency converter carries out rotation speed following, and has a four-quadrant operation function, so that the high-voltage frequency converter can start power generation through the energy of a feedback network of the high-voltage frequency converter when the synchronous rotation speed of the three-phase motor is not reached in the starting process (the rotation speed of the three-phase motor is greater than the energy feedback rotation speed set by the high-voltage frequency converter, the power generation can be carried out only when the synchronous motor reaches the rated rotation speed in the traditional power generation mode, the power generation can be carried out only when the asynchronous motor exceeds the synchronous rotation speed, and the power generation mode of the utility model has obvious good economic efficiency; according to the condition of a steam source, if the unit can stably operate near the rated rotating speed for a long time, the three-phase motor is dragged to the rated rotating speed by the high-voltage frequency converter, and the output frequency and the output voltage of the high-voltage frequency converter are correspondingly equal to the rated frequency and the rated voltage; when the output voltage of the high-voltage frequency converter and the input voltage are in the same frequency and phase, judging to switch on a power frequency switch of a generator of the electric power generation cabinet through a synchronization device, stopping the output of the high-voltage frequency converter and switching off a change-over switch, so that the three-phase motor is directly connected to the grid for power generation; if the steam source condition changes again, and the rotating speed of the unit is lower than the synchronous rotating speed of the three-phase motor, the generator power frequency switch of the electric power generation cabinet is disconnected, and the change-over switch is switched on to be put into the high-voltage frequency converter again to operate to continue the variable-frequency power generation.
At present, the price of the high-voltage frequency converter is still relatively expensive, although an excitation system is cancelled, the investment of a new scheme is increased; however, the waste heat steam which cannot be utilized originally is adopted to generate electricity, so that the energy is saved, the environment is protected, if the generator set can operate for a long time, the investment can be returned, and good benefits can be obtained on the whole.
Finally, it should be noted that the above-mentioned embodiments illustrate only specific embodiments of the invention. Obviously, the present invention is not limited to the above embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the invention should be considered as within the scope of the invention.
Claims (3)
1. The waste heat power generation system based on the unstable steam source comprises a variable frequency inlet wire cabinet connected with a bus at the generator end, a voltage transformer cabinet, an electric power generation cabinet and a three-phase motor driven by a steam turbine and connected with the variable frequency inlet wire cabinet; the method is characterized in that: the system also comprises an isolation phase-shifting transformer and a high-voltage frequency converter which are sequentially connected between the variable-frequency incoming line cabinet and the three-phase motor.
2. The system according to claim 1, wherein the system comprises: an isolating switch is arranged between the isolating phase-shifting transformer and the high-voltage frequency converter; and a change-over switch is arranged between the high-voltage frequency converter and the three-phase motor.
3. The system according to claim 2, wherein the system comprises: the three-phase motor is provided with a synchronous voltage transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020560692.6U CN211670800U (en) | 2020-04-15 | 2020-04-15 | Waste heat power generation system based on unstable steam source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020560692.6U CN211670800U (en) | 2020-04-15 | 2020-04-15 | Waste heat power generation system based on unstable steam source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211670800U true CN211670800U (en) | 2020-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020560692.6U Expired - Fee Related CN211670800U (en) | 2020-04-15 | 2020-04-15 | Waste heat power generation system based on unstable steam source |
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| Country | Link |
|---|---|
| CN (1) | CN211670800U (en) |
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2020
- 2020-04-15 CN CN202020560692.6U patent/CN211670800U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201013 |
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| CF01 | Termination of patent right due to non-payment of annual fee |