CN101951216B - Regulating method of reverse-running electricity generation of water pump of pump station - Google Patents
Regulating method of reverse-running electricity generation of water pump of pump station Download PDFInfo
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- CN101951216B CN101951216B CN2010102640926A CN201010264092A CN101951216B CN 101951216 B CN101951216 B CN 101951216B CN 2010102640926 A CN2010102640926 A CN 2010102640926A CN 201010264092 A CN201010264092 A CN 201010264092A CN 101951216 B CN101951216 B CN 101951216B
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Abstract
The invention provides a regulating method of the reverse-running electricity generation of a water pump of a pump station, which relates to the technical field of pump stations. The regulating method comprises the following steps of: (1) starting the water pump to run in a no-load mode by a frequency conversion device at 40Hz frequency corresponding rotating speed and absorbing electric energy from an electric network by a water-pump motor through the frequency conversion device at the moment; (2) starting a water discharging gate, running a water pump and a water turbine in the same direction to enter an electricity generation state from an electric state and stabilizing electricity generation rotating speed in the 40Hz frequency corresponding rotating speed, at the moment, the water pump works in an electricity generator state under a water head, and energy flows into the electric network through the frequency conversion device; and (3) searching the optimal running electricity generation rotating speed of the water turbine, running the electricity generator at the optimal electricity generation rotating speed and obtaining optimal electricity generation efficiency. The invention can improve electricity generation quantity of 50 percent and ensure that the reverse-running electricity generation possibility of the water pump which can not run under an electricity generation work condition originally is increased by regulating the electricity generation running frequency.
Description
Technical field
What the present invention relates to is a kind of control method of pumping plant technical field, particularly, relates to a kind of control method that adopts the water pump in pump station inverted running generating of generator operation frequency translation.
Background technology
Well behaved water pump can be used as hydraulic turbine operation, and domestic some pumping plant is attempted the reverse generation mode of water pump, has obtained tangible economic benefit.
Owing to be to select when water pump designs by the highest operational efficiency of water pump self, to overcome the runner loss simultaneously, general high efficient area lift is higher; And water pump is during as hydraulic turbine operation; Head during its reverse generator operation often rated head when drawing water operation is little, therefore, with the rotating speed operational mode concerning general water pump; Its operational efficiency is on the low side, can not effectively utilize water resources.Promptly directly adopt with the rotating speed general efficient of generating electricity very lowly, can obtain bigger generating efficiency through reducing water pump (hydraulic turbine) rotating speed, but general pumping plant adopts synchronous machine, speed governing is difficulty comparatively.Be to improve generating efficiency, water pump in pump station can take to increase the mode of utmost point reduction of speed when reverse generator operation.
In the prior art when water pump as the hydraulic turbine during with rotating speed generator operation operating mode, this moment, the hydraulic turbine was forced under synchronous speed, was in lower generating efficiency.Improve certain generating efficiency though can reduce rotating speed of motor, unit is operated under the best generating efficiency constantly through the number of pole-pairs that changes (increase) motor.
When adopting the frequency translation operating condition of generator motor unit pattern, the electric energy that hydraulic generator sends drives the motor operation of low frequency in the prior art, and the low frequency motor drives the power frequency generator operation again, reaches the purpose of generating electricity by way of merging two or more grid systems.The frequency-transposition arrangement of unit pattern can improve hydraulic turbine generating efficiency to a certain extent, because the unadjustable property of unit operation frequency, when productive head changed, it just can not be kept the hydraulic turbine and be in best generator operation efficient.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of control method of water pump in pump station inverted running generating is provided.The present invention adopts the water pump in pump station inverted running mode of generator operation frequency translation, and technical problem to be solved is in hydroelectric power generation, to have the operational mode that keeps pump generator maximum generation efficient, flexible operation, such performance easy to adjust constantly.
The present invention realizes through following technical scheme:
The present invention is through adopting the frequency translation that can make the energy two-way flow between pump generator and electrical network; Convert the electric energy of net side 50Hz to the electric energy of frequency adjustable joint; Thereby the regulator generator rotating speed makes it to be under the best generating efficiency operating mode, comprises that step is following:
1. frequency-transposition arrangement starts water pump no-load running, and under the corresponding rotating speed of 40Hz frequency, this moment, pump motor absorbed electric energy through frequency-transposition arrangement from electrical network;
2. open outlet gate, the equidirectional operation of pump turbine gets into generating state by motoring condition, and the generating stabilization of speed is at the corresponding rotating speed of 40Hz frequency, and this moment, pump working was at the generator state under this head, and energy flows into electrical network through frequency-transposition arrangement;
3. seek the best generating rotating speed of hydraulic turbine operation, make generator operation under the best generating rotating speed, obtain best generating efficiency.
Described best generating rotating speed is meant:
Pump generator at this moment, increases frequency-transposition arrangement pusher side frequency with the 1Hz frequency step after getting into the stabilized (steady-state) speed generating under a certain head situation, the pump generator running speed increases:
When if power output presents growth trend, then in 50Hz, continue increase pusher side frequency, reduction trend appears up to power output;
The pusher side frequency of correspondence when flex point appears in the record output frequency; Reduce the pusher side output frequency with the 0.1Hz frequency step again; Output of a generator shows a rising trend; When reduction trend appearred in output frequency, the operation of frequency-transposition arrangement pusher side frequency stabilization was the best generating efficiency running speed of pump generator under this head this moment.
When power output presents reduction trend, then reduce the pusher side frequency with the 1Hz frequency step, if power output presents growth trend, then continue to reduce the pusher side frequency, reduction trend appears up to power output;
The pusher side frequency of correspondence when flex point appears in the record output frequency; Increase the pusher side output frequency with the 0.1Hz frequency step again; Output of a generator shows a rising trend; When reduction trend appearred in output frequency, the operation of frequency-transposition arrangement pusher side frequency stabilization was the best generating efficiency running speed of pump generator under this head this moment.
When if head increases, the corresponding increase of the best generating efficiency running speed meeting of generator, increase frequency-transposition arrangement pusher side frequency with the 1Hz frequency step this moment, and the pump generator running speed increases;
When perhaps if head reduces, the corresponding reduction of the best generating efficiency running speed meeting of generator, reduce frequency-transposition arrangement pusher side frequency with the 1Hz frequency step this moment, and the pump generator running speed decreases;
Seek mode according to the best generating rotating speed, make generator operation under the best generating rotating speed, obtain best generating efficiency.
The present invention is according to different water pumps and different heads for the reverse generator operation of water pump, makes the water pump of pump generator operation regulate the best generating efficiency of acquisition automatically, keeps the highest generating efficiency operation constantly.According to machine unit characteristic, when different head, the frequency of the power supply that is incorporated into the power networks is regulated the running speed with the adjustment unit continuously, unit is operated under the preferable operating mode forever, can improve generator operation efficient greatly, made full use of water resource.Generally, compare, generate electricity through the used method of the present invention and can improve 50% energy output with respect to the generating operation mode of forced service when the synchronous speed that directly be incorporated into the power networks.Simultaneously, method provided by the invention is that hydroelectric power generation provides a kind of brand-new operational mode, through the generator operation frequency adjustment, can make the water pump that can not operate in originally under the generating operation mode increase the feasibility of water pump inverted running generating.
Description of drawings
Fig. 1 workflow sketch map of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: following examples provided detailed execution mode and process, but protection scope of the present invention are not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
Embodiment
For making the hydraulic turbine be in best generating efficiency constantly; " state type " frequency conversion pattern conversion that frequency translation adopts frequency to regulate continuously; The closed-loop adjustment mode is adopted in head variation, frequency adjustment, rotating speed adjustment; Adjust its pusher side frequency constantly according to the frequency conversion of head, thereby the hydraulic turbine is operated under the efficient power generation running speed all the time.
According to the turbine efficiency characteristic curve, to the hydraulic turbine under a certain head and a certain performance, its an optimum operation efficient and a specific rotation speeds are corresponding.It is certain and generating adjustings under the hydraulic turbine performance different situations are certain with hydraulic turbine performance and generated output adjusting under the head situation of change that but the reverse generated output of water pump is regulated water diversing head.
As shown in Figure 1, present embodiment may further comprise the steps:
1. frequency-transposition arrangement starts water pump no-load running; Pump motor is operated under the electronic situation; The pump motor rotating speed that under the drive of frequency-transposition arrangement, progressively raises; Final stable operation is under the corresponding rotating speed of 40Hz frequency, and this moment, pump motor absorbed electric energy through frequency-transposition arrangement from electrical network.
But the frequency during the unloaded stable operation of pump motor when moving for the first time initial setting at 40Hz; Can be in the running afterwards according to history log; Head value when starting according to generator; When directly setting can make generator be operated in best generating efficiency near running frequency, reduce the frequency adjustment process, improve energy output to a certain extent.For this reason, reservoir need be set up the head monitoring device.
2. after the pump motor stable operation, open outlet gate, pump turbine is under the impact of current; Equidirectional acceleration operation, when speed was in supersynchronous rotating speed, system put into excitation; Pump motor gets into generating state by motoring condition; The generating stabilization of speed is at the corresponding rotating speed of 40Hz frequency, and this moment, pump working was at the generator state under this head, and energy flows into electrical network through frequency-transposition arrangement.
Pump motor NE BY ENERGY TRANSFER direction changes, and frequency-transposition arrangement must be the four quadrant running device for this reason, can adapt to the transient process that the motor operational mode changes the power transfer direction transformation that brings.
3. pump generator is sought the best generating rotating speed of corresponding hydraulic turbine operation characteristic under this head after getting into above-mentioned stabilization of speed generator operation under a certain head situation.Initially, increase frequency-transposition arrangement pusher side frequency with the 1Hz frequency step, the pump generator running speed increases, and output of a generator is monitored and write down to supervisory control system automatically.
4. analysis generator power output variation tendency if power output presents growth trend, then continues increase pusher side frequency (can not surpass 50Hz), reduction trend occurs up to power output.The pusher side frequency of correspondence when flex point appears in the record output frequency; Reduce the pusher side output frequency with the 0.1Hz frequency step again; Output of a generator shows a rising trend; When reduction trend appearred in output frequency, the operation of frequency-transposition arrangement pusher side frequency stabilization was the best generating efficiency running speed of pump generator under this head this moment.
5. when the pusher side frequency increases with the 1Hz frequency step, if power output presents reduction trend, then reduce the pusher side frequency, monitoring and record analysis output of a generator with the 1Hz frequency step.If power output presents growth trend, then continue to reduce the pusher side frequency, reduction trend appears up to power output.The pusher side frequency of correspondence when flex point appears in the record output frequency; Increase the pusher side output frequency with the 0.1Hz frequency step again; Output of a generator shows a rising trend; When reduction trend appearred in output frequency, the operation of frequency-transposition arrangement pusher side frequency stabilization was the best generating efficiency running speed of pump generator under this head this moment.
When 6. head increases; The corresponding increase of the best generating efficiency running speed meeting of generator; Increase frequency-transposition arrangement pusher side frequency with the 1Hz frequency step this moment; The pump generator running speed increases, and 4 monitoring and record analysis output of a generator finally make generator operation under best generating efficiency set by step.
When 7. head reduces; The corresponding reduction of the best generating efficiency running speed meeting of generator; Reduce frequency-transposition arrangement pusher side frequency with the 1Hz frequency step this moment; The pump generator running speed decreases, and 5 monitoring and record analysis output of a generator finally make generator operation under best generating efficiency set by step.
Present embodiment is in the pump generator process, and head monitoring and frequency setting are accomplished by supervisory control system, constitute the close-loop automatic adjustment system.Above-mentioned control method adapts to first application period; After date when one section of water pump generator operation; Because supervisory control system has memory function, corresponding arbitrary head, supervisory control system can be found out generator optimum operation frequency values or running frequency scope that should head immediately; Thereby when head changed, frequency-transposition arrangement can run directly in frequency optimum traffic under the order of supervisory control system.In generating power output adjustment process, also should set defencive function, should not make pump motor in the rotational speed regulation process, develop frequency resonance phenomenon and overload situation.
Claims (3)
1. the control method of a water pump in pump station inverted running generating is characterized in that, comprises that step is following:
1. frequency-transposition arrangement starts water pump no-load running, and under the corresponding rotating speed of 40Hz frequency, this moment, pump motor absorbed electric energy through frequency-transposition arrangement from electrical network;
2. open outlet gate, the equidirectional operation of pump turbine gets into generating state by motoring condition, and the generating stabilization of speed is at the corresponding rotating speed of 40Hz frequency, and this moment, pump working was at the generator state under this head, and energy flows into electrical network through frequency-transposition arrangement;
3. seek the best generating rotating speed of hydraulic turbine operation, make generator operation under the best generating rotating speed, obtain best generating efficiency;
Described best generating rotating speed is meant:
Pump generator at this moment, increases frequency-transposition arrangement pusher side frequency with the 1Hz frequency step after getting into the stabilized (steady-state) speed generating under a certain head situation, the pump generator running speed increases:
When if power output presents growth trend, then in 50Hz, continue increase pusher side frequency, reduction trend appears up to power output;
The pusher side frequency of correspondence when flex point appears in the record output frequency; Reduce the pusher side output frequency with the 0.1Hz frequency step again; Output of a generator shows a rising trend, and reduction trend occurs until output frequency, and pump generator gets into best generating efficiency running speed under this head at this moment;
When power output presents reduction trend, then reduce the pusher side frequency with the 1Hz frequency step, if power output presents growth trend, then continue to reduce the pusher side frequency, reduction trend appears up to power output.The pusher side frequency of correspondence when flex point appears in the record output frequency; Increase the pusher side output frequency with the 0.1Hz frequency step again; Output of a generator shows a rising trend; When reduction trend appears in output frequency, the operation of frequency-transposition arrangement pusher side frequency stabilization, the best generating efficiency running speed of pump generator under this this head at this moment.
2. the control method of water pump in pump station inverted running generating according to claim 1; It is characterized in that; When if head increases; The corresponding increase of the best generating efficiency running speed meeting of generator, increase frequency-transposition arrangement pusher side frequency with the 1Hz frequency step this moment, and the pump generator running speed increases; Seek mode according to the best generating rotating speed, make generator operation under the best generating rotating speed, obtain best generating efficiency.
3. the control method of water pump in pump station inverted running generating according to claim 1; It is characterized in that; When if head reduces; The corresponding reduction of the best generating efficiency running speed meeting of generator, reduce frequency-transposition arrangement pusher side frequency with the 1Hz frequency step this moment, and the pump generator running speed decreases; Seek mode according to the best generating rotating speed, make generator operation under the best generating rotating speed, obtain best generating efficiency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102640926A CN101951216B (en) | 2010-08-27 | 2010-08-27 | Regulating method of reverse-running electricity generation of water pump of pump station |
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| CN2010102640926A CN101951216B (en) | 2010-08-27 | 2010-08-27 | Regulating method of reverse-running electricity generation of water pump of pump station |
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| CN101951216A CN101951216A (en) | 2011-01-19 |
| CN101951216B true CN101951216B (en) | 2012-05-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2014239604A (en) * | 2013-06-07 | 2014-12-18 | 株式会社神戸製鋼所 | Generating set |
| CN105591579A (en) * | 2015-12-08 | 2016-05-18 | 钱邦永 | Water pump power generation system in pumping station and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0243937B1 (en) * | 1986-04-30 | 1991-05-29 | Hitachi, Ltd. | Variable-speed pumped-storage power generating system |
| JP2631373B2 (en) * | 1987-08-20 | 1997-07-16 | 株式会社日立製作所 | Operation control device of variable speed pumped storage power generation system |
| ES2233979T3 (en) * | 1995-10-31 | 2005-06-16 | General Electric Company | PROCEDURE AND ASynchronous CONVERTER APPARATUS FOR THE GENERATION OF HYDROELECTRIC ENERGY WITH VARIABLE SPEED TURBINE. |
| JP3465246B2 (en) * | 2001-11-08 | 2003-11-10 | 学校法人東海大学 | Fluid power generator |
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Effective date of registration: 20161230 Address after: 223001 science and Technology Industrial Park, Jiangsu, Huaian science and technology road, No. 18 Patentee after: North Jiangsu Institute of Shanghai Jiaotong University Address before: 200240 Dongchuan Road, Shanghai, No. 800, No. Patentee before: SHANGHAI JIAO TONG University |
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Granted publication date: 20120516 Termination date: 20210827 |
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