CN113991666B - Runoff type small hydropower station power grid system with front pool containing energy storage and control method - Google Patents
Runoff type small hydropower station power grid system with front pool containing energy storage and control method Download PDFInfo
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- CN113991666B CN113991666B CN202111365115.7A CN202111365115A CN113991666B CN 113991666 B CN113991666 B CN 113991666B CN 202111365115 A CN202111365115 A CN 202111365115A CN 113991666 B CN113991666 B CN 113991666B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 159
- 238000000034 method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 108
- 238000010248 power generation Methods 0.000 claims abstract description 41
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims description 21
- 230000001965 increasing effect Effects 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 10
- 230000001939 inductive effect Effects 0.000 claims description 6
- 238000005381 potential energy Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims 3
- 230000029087 digestion Effects 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a power grid system of a runoff type small hydropower station with a front pool containing energy storage and a control method, wherein the system comprises a water inlet pipeline, the front pool, a water outlet pipeline, a generator and a battery energy storage group; the water inlet pipeline is connected with the water inlet side of the front pool, the first end of the water outlet pipeline is connected with the water outlet side of the front pool, and the second end of the water outlet pipeline is connected to the generator; a liquid level meter is arranged in the front pool, and a water inlet pipeline and a water outlet pipeline are respectively provided with a first flowmeter and a second flowmeter; the battery energy storage group is connected with the bus together with the electric energy output end of the generator through the energy storage bidirectional converter. The power grid system of the radial-flow type small hydropower station provided by the invention is provided with the water quantity and the flow monitoring power of the pressure front pool of the radial-flow type small hydropower station, and realizes hydropower power adjustment and energy storage by utilizing flow adjustment; the combined energy storage control method for the water storage and the battery of the pressure front pool of the power grid system can be changed, so that the power output and the energy storage can be controlled rapidly and accurately, and the power generation regulation capacity and the digestion capacity of the radial-flow type small hydropower station are improved.
Description
Technical Field
The invention belongs to the technical field of hydroelectric energy storage, and particularly relates to a power grid system of a runoff type small hydropower station with a front tank containing energy storage and a control method.
Background
The pressure front pool of the hydropower station is a water pressure stable power grid system, so that the power stability of the generator can be ensured, meanwhile, the hydropower station has certain storage and impact resistance, and the energy storage and regulation capacity of the radial-flow type small hydropower can be improved by combining with the emerging energy storage technology.
The small hydropower stations in China are rich in resources and wide in distribution, and historically provide electricity for one third of county and city in China. Radial flow small water electric machines have a considerable specific gravity. The radial flow type small water power regulation capability is poor, the output is very unstable, and the stability of network load supply is seriously affected. The existing solution mainly adopts load prediction and water-discarding unloading technology, wherein the water-discarding unloading is to maintain the power generation at the minimum stable value, so that a large amount of generated energy is wasted and the economy is seriously influenced; the load prediction mode can improve the water and electricity local digestion capacity, but the instantaneous load fluctuation causes serious reactive voltage problems due to water and electricity regulation deviation.
Disclosure of Invention
The invention aims to provide a power grid system of a runoff type small hydropower station with a front pool containing energy storage and a control method, and aims to solve the problem of poor runoff type small hydropower station regulation capability in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The invention provides a power grid system of a runoff type small hydropower station with a front pool containing energy storage, which comprises a water inlet pipeline, the front pool, a water outlet pipeline, a generator and a battery energy storage group;
the water inlet pipeline is connected with the water inlet side of the front pool, the first end of the water outlet pipeline is connected with the water outlet side of the front pool, and the second end of the water outlet pipeline is connected to the generator;
A liquid level meter is arranged in the forehearth, and a first flowmeter and a second flowmeter are respectively arranged on the water inlet pipeline and the water outlet pipeline;
the battery energy storage group is connected with the bus together with the electric energy output end of the generator through the energy storage bidirectional converter.
Optionally, a controllable adjusting valve is arranged on the water outlet pipeline.
Optionally, the bus bar is connected to an ac power grid through a step-up transformer.
In a second aspect of the invention, a control method for a power grid system of a runoff type small hydropower station with an energy storage front pool is provided, which comprises the following steps: the front tank energy storage is independently regulated, the battery energy storage is independently regulated and the combined energy storage is regulated;
The front pool energy storage independent regulation is to control the water storage amount of the water outlet flow regulation front pool, so as to complete the power generation control, when the energy storage is to be increased, the water outlet flow is reduced, the power generation is reduced, and when the energy storage is to be reduced, the water outlet flow is increased, and the power generation is increased;
The independent regulation of battery energy storage is that an energy storage battery adopts a grid-connected P/Q regulation operation mode through a bidirectional converter, absorbs the energy of an alternating current power grid to store energy, and releases the chemical energy of the battery to release electric energy to the power grid;
and the combined energy storage regulation is carried out, and meanwhile, the outflow flow of the front pool and the energy storage bidirectional converter are regulated, so that the generated power and the pure energy storage capacity are regulated.
Optionally, the specific adjusting method for the independent adjustment of the front tank energy storage, the independent adjustment of the battery energy storage and the combined energy storage adjustment is as follows:
When the current water storage quantity Q of the current pool reaches the maximum water storage quantity allowed by the front pool, qo is increased, and Qo=Qi; if the power generation power P required by the power grid system is more than P1, discharging the battery energy storage group, wherein the discharging power is P2=P-P1; if the power generation power P < P1 required by the power grid system at the moment, charging the battery energy storage group, wherein the charging power P2=P1-P;
when Qmin < Q < Qmax, if the grid system requires P < P1 at this time, reduce Qo, making p=p1; if the power generation power required by the power grid system is P > P1 and Qo < Qi, increasing Qo to enable P=P1; if Qo=Qi is increased, still P > P1, the battery energy storage group discharges, and the discharge power P2=P-P1;
the current water storage quantity Q of the current pool reaches the maximum storage quantity allowed by the front pool, the current energy storage Q2 of the battery energy storage group reaches the maximum energy storage allowed by the battery energy storage group, qo < Qi, the power generation power P < P1 required by a power grid system, and the water turbine starts an unloader to reduce the power generation power of the generator, so that P=P1;
the current water storage quantity Q of the current pool reaches the minimum water storage quantity allowed by the front pool, the current energy storage Q2 of the battery energy storage group reaches the minimum energy storage allowed by the battery energy storage group, qo=Qi, the power generation power P > P1 required by the power grid system is maintained by the power grid system, qo=Qi is maintained until the power generation power required by the power grid system is reduced to P < P1, and the energy storage of the front pool is started;
Wherein Q is the current water storage capacity of the front pool, qmax is the maximum water storage capacity allowed by the front pool, qmin is the minimum water storage capacity allowed by the front pool, qo is the outflow flow of the front pool, qi is the inflow flow of the front pool, Q2 is the current energy storage of the battery energy storage group, Q2max is the maximum energy storage allowed by the battery energy storage group, Q2min is the minimum energy storage allowed by the battery energy storage group, P is the power generation power of the hydropower station, P1 is the power generation power of the generator, and P2 is the discharging or charging power of the battery energy storage group.
Optionally, the water storage quantity Q of the front pool is calculated according to the liquid level height and the area by installing a liquid level meter in the pool, and the equivalent potential energy of the water storage quantity Q of the front pool is the pool energy storage capacity Q1.
Optionally, the inflow Qi of the foretank is monitored by installing a flowmeter on the water inlet pipeline, and calculating the water quantity according to the flow rate and the pipeline sectional area.
Optionally, the monitoring of the outflow Qo of the front pool is to install a flowmeter on the water outlet pipeline, and calculate the water quantity according to the flow rate and the sectional area of the pipeline; the outflow Qo control of the front pool is realized by installing a controllable regulating valve on the water outlet pipeline.
Optionally, the front tank energy storage capacity Q1 is smaller than the battery energy storage group capacity Q2, and the battery energy storage group power P2 is larger than the generator power P1.
Optionally, when the inductive reactive power output by the generator is smaller than the demand of the power grid system, the bidirectional energy storage converter releases reactive power to the power grid system; when the inductive reactive power output by the generator is greater than the demand of the power grid system, the bidirectional energy storage converter absorbs reactive power from the power grid system.
The beneficial effects of the invention are as follows:
The power grid system of the radial-flow small hydropower station provided by the embodiment of the invention is provided with the water quantity and the flow monitoring power of the pool before the pressure of the radial-flow small hydropower station, and realizes the adjustment of the hydropower power and the energy storage by utilizing the flow adjustment; the combined energy storage control method for the water storage and the battery of the pressure front pool of the power grid system can be changed, so that the power output and the energy storage can be controlled rapidly and accurately, and the power generation regulation capacity and the digestion capacity of the radial-flow type small hydropower station are improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
Fig. 1 is a schematic diagram of a power grid system of a radial-flow type small hydropower station according to an embodiment of the invention.
Wherein: 1, a bus bar; 2, a generator; 3, a front pool; 4, an energy storage bidirectional converter; 5, a battery energy storage group; 6, a water inlet pipeline; 7, a water outlet pipeline; 8 a second flowmeter; 9, a controllable regulating valve; 10 first flow meter.
Detailed Description
The application will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
The following detailed description is exemplary and is intended to provide further details of the application. Unless defined otherwise, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the application.
As shown in fig. 1, in a first aspect of the present invention, there is provided a power grid system of a runoff type small hydropower station with a front tank containing energy storage, which comprises a water inlet pipeline 6, a front tank 3, a water outlet pipeline 7, a generator 2 and a battery energy storage group 5; the water inlet pipeline 6 is connected with the water inlet side of the front pool 3, the first end of the water outlet pipeline 7 is connected with the water outlet side of the front pool 3, and the second end of the water outlet pipeline 7 is connected to the generator 2; a liquid level meter is arranged in the forehearth 3, and a first flowmeter 10 and a second flowmeter 8 are respectively arranged in the water inlet pipeline 6 and the water outlet pipeline 7; the battery energy storage group 5 is connected with the bus bar 1 together with the electric energy output end of the generator 2 through the energy storage bidirectional converter 4, a controllable regulating valve 9 is arranged on the water outlet pipeline 7, and the bus bar 1 is connected with an alternating current power grid through a step-up transformer. The power grid system of the radial-flow type small hydropower station is provided with the water quantity and the flow monitoring power of a pool before the pressure of the radial-flow type small hydropower station, and the hydropower power regulation and the energy storage are realized by utilizing the flow regulation; the combined energy storage control method for the water storage and the battery of the pressure front pool of the power grid system can be changed, so that the power output and the energy storage can be controlled rapidly and accurately, and the power generation regulation capacity and the digestion capacity of the radial-flow type small hydropower station are improved. The power output and the energy storage can be rapidly and accurately controlled through the pressure front pool water storage and battery combined energy storage power grid system, and the power generation regulation energy of the radial-flow type small hydropower station is improved.
In a second aspect of the invention, a control method for a power grid system of a runoff type small hydropower station with an energy storage front pool is provided, which comprises the following steps: the front tank energy storage is independently regulated, the battery energy storage is independently regulated and the combined energy storage is regulated; the front pool energy storage independent regulation is to control the water storage amount of the water outlet flow regulation front pool 3 so as to complete the power generation control, when the energy storage is to be increased, the water outlet flow is reduced, the power generation is reduced, and when the energy storage is to be reduced, the water outlet flow is increased, and the power generation is increased; the independent regulation of battery energy storage is that an energy storage battery adopts a grid-connected P/Q regulation operation mode through a bidirectional converter, absorbs the energy of an alternating current power grid to store energy, and releases the chemical energy of the battery to release electric energy to the power grid; and the combined energy storage regulation is carried out, and meanwhile, the outflow flow of the front pool and the energy storage bidirectional converter 4 are regulated, so that the generated power and the pure energy storage capacity are regulated. When the inductive reactive power output by the generator 2 is smaller than the demand of the power grid system, the bidirectional energy storage converter releases reactive power to the power grid system; when the inductive reactive power output by the generator 2 is greater than the grid system demand, the bi-directional energy storage converter absorbs reactive power from the grid system.
As a specific embodiment applied to the present invention, the specific adjustment methods of the front tank energy storage independent adjustment, the battery energy storage independent adjustment and the combined energy storage adjustment are as follows:
in this embodiment, the energy storage capacity Q1 of the front tank 3 is smaller than the capacity Q2 of the battery energy storage group 5, and the power P2 of the battery energy storage group 5 is larger than the power P1 of the generator 2.
When the current water storage quantity Q of the current pool reaches the maximum allowable water storage quantity of the front pool 3, Q is approximately equal to Qmax, qo is increased, and Qo=Qi is achieved; if the power generation power P > P1 required by the power grid system at the moment, discharging the battery energy storage group 5, wherein the discharging power P2=P-P1; if the power generation power P < P1 required by the power grid system at the moment, the battery energy storage group 5 is charged, and the charging power P2=P1-P;
When Qmin < Q < Qmax, if the grid system requires P < P1 at this time, reduce Qo, making p=p1; if the power generation power required by the power grid system is P > P1 and Qo < Qi, increasing Qo to enable P=P1; if qo=qi is increased, still P > P1, the battery pack 5 is discharged, and the discharge power p2=p-P1;
the current water storage quantity Q of the current pool reaches the maximum allowable storage quantity Q (approximately equal to Qmax) of the front pool 3, the current energy storage Q2 of the battery energy storage group 5 reaches the maximum allowable energy storage Q2 (approximately equal to Q2 max) of the battery energy storage group 5, qo is less than Qi, the power generation power P < P1 required by a power grid system, the water turbine starts an unloader, the power generation power of the generator 2 is reduced, and P=P1 is caused;
The current water storage quantity Q of the current pool reaches the minimum water storage quantity Q approximately equal to Qmin allowed by the front pool 3, the current energy storage Q2 of the battery energy storage group 5 reaches the minimum energy storage Q2 approximately equal to Q2min allowed by the battery energy storage group 5, qo=Qi, the power generation power P > P1 required by the power grid system is maintained, qo=Qi is maintained by the power grid system until the power generation power required by the power grid system is reduced to P < P1, and the energy storage of the front pool 3 is started.
Wherein Q is the current water storage capacity of the front pool, qmax is the maximum water storage capacity allowed by the front pool, qmin is the minimum water storage capacity allowed by the front pool, qo is the outflow flow of the front pool, qi is the inflow flow of the front pool, Q2 is the current energy storage of the battery energy storage group, Q2max is the maximum energy storage allowed by the battery energy storage group, Q2min is the minimum energy storage allowed by the battery energy storage group, P is the power generation power of the hydropower station, P1 is the power generation power of the generator, and P2 is the discharging or charging power of the battery energy storage group.
As an example, the storage amount Q of the front tank 3 is calculated from the liquid level height and the area by installing a liquid level meter in the tank, and the equivalent potential energy of the storage amount Q of the front tank 3 is the tank storage capacity Q1.
As an example, the inflow Qi of the foretank 3 is monitored by installing a flowmeter in the water intake pipe 6, and calculating the water amount from the flow rate and the pipe sectional area.
As an example, the outflow Qo monitoring of the foretank 3 is to install a flowmeter in the outflow pipeline 7, and calculate the water amount according to the flow rate and the pipeline sectional area; the outflow Qo control of the forehearth 3 is controlled by installing a controllable regulating valve 9 on the water outlet pipeline 7.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Claims (7)
1. The utility model provides a control method of a power grid system of a runoff type small hydropower station with an energy storage in a front pool, which is characterized by comprising the following steps: the front tank energy storage is independently regulated, the battery energy storage is independently regulated and the combined energy storage is regulated;
The front pool energy storage independent regulation is to control the water storage amount of the water outlet flow regulation front pool (3), so as to complete the power generation control, when the energy storage is to be increased, the water outlet flow is reduced, the power generation is reduced, and when the energy storage is to be reduced, the water outlet flow is increased, and the power generation is increased;
The independent regulation of battery energy storage is that an energy storage battery adopts a grid-connected P/Q regulation operation mode through a bidirectional converter, absorbs the energy of an alternating current power grid to store energy, and releases the chemical energy of the battery to release electric energy to the power grid;
The energy storage regulation is combined, the outflow flow of the front pool and the energy storage bidirectional converter (4) are regulated at the same time, and the generated power and the pure energy storage capacity are regulated;
the specific adjusting method for the front pool energy storage independent adjustment, the battery energy storage independent adjustment and the combined energy storage adjustment is as follows:
When the current water storage quantity Q of the current pool reaches the maximum allowable water storage quantity of the front pool (3), qo is increased, and Qo=Qi; if the power generation power P required by the power grid system is more than P1, discharging the battery energy storage group (5), wherein the discharging power is P2=P-P1; if the power generation power P < P1 required by the power grid system at the moment, the battery energy storage group (5) is charged, and the charging power P2=P1-P;
When Qmin < Q < Qmax, if the grid system requires P < P1 at this time, reduce Qo, making p=p1; if the power generation power required by the power grid system is P > P1 and Qo < Qi, increasing Qo to enable P=P1; if the Qo=Qi is increased, still P > P1, the battery energy storage group (5) is discharged, and the discharging power P2=P-P1;
The current water storage quantity Q of the current pool reaches the maximum allowable water storage quantity of the front pool (3), the current energy storage Q2 of the battery energy storage group (5) reaches the maximum allowable energy storage of the battery energy storage group (5), qo < Qi, the power generation power P < P1 required by a power grid system, and the water turbine starts an unloader to reduce the power generation power of the generator (2) so as to ensure that P=P1;
the current water storage quantity Q of the current pool reaches the minimum water storage quantity allowed by the front pool (3), the current energy storage Q2 of the battery energy storage group (5) reaches the minimum energy storage allowed by the battery energy storage group (5), qo=Qi, the power generation power P > P1 required by the power grid system is maintained by the power grid system, qo=Qi is maintained until the power generation power required by the power grid system is reduced to P < P1, and the energy storage of the front pool (3) is started;
wherein Q is the current water storage capacity of the front pool, qmax is the maximum water storage capacity allowed by the front pool, qmin is the minimum water storage capacity allowed by the front pool, qo is the outflow flow of the front pool, qi is the inflow flow of the front pool, Q2 is the current energy storage of the battery energy storage group, Q2max is the maximum energy storage allowed by the battery energy storage group, Q2min is the minimum energy storage allowed by the battery energy storage group, P is the power generation power of the hydropower station, P1 is the power generation power of the generator, and P2 is the discharging or charging power of the battery energy storage group;
The energy storage capacity Q1 of the front pool (3) is smaller than the capacity Q2 of the battery energy storage group (5), and the power P2 of the battery energy storage group (5) is larger than the power P1 of the generator (2);
the power grid system of the runoff type small hydropower station with the front pool containing energy storage comprises a water inlet pipeline (6), the front pool (3), a water outlet pipeline (7), a generator (2) and a battery energy storage group (5);
The water inlet pipeline (6) is connected with the water inlet side of the front pool (3), the first end of the water outlet pipeline (7) is connected with the water outlet side of the front pool (3), and the second end of the water outlet pipeline (7) is connected to the generator (2);
A liquid level meter is arranged in the forehearth (3), and a first flowmeter (10) and a second flowmeter (8) are respectively arranged on the water inlet pipeline (6) and the water outlet pipeline (7);
the battery energy storage group (5) is connected with the bus bar (1) together with the electric energy output end of the generator (2) through the energy storage bidirectional converter (4).
2. The method for controlling a power grid system of a runoff type small hydropower station with energy storage in a forehearth according to claim 1, wherein a controllable regulating valve (9) is arranged on the water outlet pipeline (7).
3. The method for controlling a power grid system of a small radial flow hydropower station with energy storage in a forehearth according to claim 1, wherein the busbar (1) is connected with an alternating current power grid through a step-up transformer.
4. The control method of the power grid system of the runoff type small hydropower station with the front pool containing energy storage according to claim 1, wherein the storage quantity Q of the front pool (3) is calculated according to the liquid level height and the area by installing a liquid level meter in the pool, and the equivalent potential energy of the storage quantity Q of the front pool (3) is the pool energy storage capacity Q1.
5. The method for controlling the power grid system of the front-end basin energy-storage radial-flow type small hydropower station according to claim 1, wherein the inflow Qi of the front-end basin (3) is monitored by installing a flowmeter on a water inlet pipeline (6), and the water quantity is calculated according to the flow rate and the pipeline sectional area.
6. The control method of the power grid system of the runoff type small hydropower station with the front pool containing energy storage according to claim 1, wherein the monitoring of the outflow flow Qo of the front pool (3) is that a flowmeter is arranged on an outflow pipeline (7), and the water quantity is calculated according to the flow rate and the pipeline sectional area; the outflow Qo control of the forehearth (3) is controlled by installing a controllable regulating valve (9) on the water outlet pipeline (7).
7. The method according to claim 1, characterized in that when the inductive reactive power output by the generator (2) is smaller than the demand of the grid system, the bidirectional energy storage converter releases reactive power to the grid system; when the inductive reactive power output by the generator (2) is larger than the demand of the power grid system, the bidirectional energy storage converter absorbs reactive power from the power grid system.
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| CN113036933A (en) * | 2021-03-17 | 2021-06-25 | 云南电网有限责任公司电力科学研究院 | Energy storage method and system based on small hydropower station pressure forebay |
| CN113054674A (en) * | 2021-03-17 | 2021-06-29 | 云南电网有限责任公司电力科学研究院 | Control method and control system based on distributed small hydropower combined energy storage |
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| CN104947746A (en) * | 2014-03-28 | 2015-09-30 | 本田技研工业株式会社 | Water pump control apparatus |
| CN108252844A (en) * | 2018-01-03 | 2018-07-06 | 毛杰 | A kind of environmental hydroelectric power generating apparatus based on remote control |
| CN113036933A (en) * | 2021-03-17 | 2021-06-25 | 云南电网有限责任公司电力科学研究院 | Energy storage method and system based on small hydropower station pressure forebay |
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