CN110365040B - Water light storage system control method - Google Patents
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
A control method of a water-light storage system is characterized in that an energy management system of the water-light storage system inhibits the large-range fluctuation of the generated power of a photovoltaic power generation subsystem according to a preset smooth power coefficient; compensating a low-frequency part of the generated power fluctuation of the photovoltaic subsystem by adopting a hydropower station subsystem; the high-frequency part of the power fluctuation of the photovoltaic power generation subsystem is compensated by adopting the variable-speed constant-frequency pumped storage power station subsystem, so that the full compensation of the power fluctuation of the photovoltaic power generation subsystem is realized.
Description
Technical Field
The invention relates to a control method suitable for a water light storage system.
Background
In recent years, various forms of new energy are rapidly developed in China, and the vigorous development of renewable energy becomes a basic national policy in China. The photovoltaic power generation is developed rapidly due to the green environmental protection and good economy, but the photovoltaic power generation has the characteristics of randomness, wave qualification, intermittence and the like, large-scale photovoltaic power generation grid connection is a great challenge to a power grid, a large-area light abandoning phenomenon appears recently, and the photovoltaic development is greatly impacted.
Compared with thermal power, the hydroelectric generation has the characteristics of flexible starting, high response speed, large reservoir capacity, good regulation characteristic and the like, meanwhile, places suitable for building a photovoltaic power generation system are generally arranged near the reservoir, a water-light complementary combined power generation system is built, the output fluctuation of a photovoltaic power station can be compensated by means of the regulation capacity of the reservoir, and the regulation capacity of a complementary power station is improved.
The variable-speed constant-frequency pumped storage power station adopts power electronic equipment, has higher response speed, can further improve the regulation and control capability of the hydroelectric generating set, and greatly promotes the development of the variable-speed constant-frequency pumped storage technology in developed countries at present. The research and test work of variable-speed pumped storage units has been started in the beginning of the 60 s of the 20 th century and in the great head of foreign industries such as Toshiba, ABB and the like. At present, in Japan, Germany and the like, dozens of power stations are put into operation, and a plurality of variable speed constant frequency pumped storage power station projects are built. Patent CN201810973332, "a reactive power control method for a water-light complementary power station", proposes the problem that the reactive power response of a photovoltaic power station quick response compensation hydroelectric generating set is slow due to excitation lag, but does not relate to the compensation of active power fluctuation by using the quick response capability of power electronic equipment. Patent CN201510006695 "water-light complementary coordination control system" proposes a water-light complementary coordination control system, which utilizes the power of a hydroelectric generating set to compensate the photovoltaic power fluctuation, but the photovoltaic power fluctuation is too fast, the active response of the hydropower is slow, and the reactive power fluctuation cannot be completely compensated.
Disclosure of Invention
The invention provides a control method of a water-light storage system, which realizes the combined complementary operation of a photovoltaic power station, a hydropower station and a variable-speed constant-frequency pumped storage power station, stabilizes the photovoltaic power fluctuation by using the characteristics of water power generation and the variable-speed constant-frequency pumped storage power station, realizes the smooth control of the power generation power of the water-light storage system, and improves the combined regulation and control capability of the water-light storage system.
The water-light storage system comprises a photovoltaic power generation subsystem, a hydropower station subsystem, a variable-speed constant-frequency pumped storage power station subsystem and an energy management system. The photovoltaic power generation subsystem, the hydropower station subsystem and the variable-speed constant-frequency pumped storage power station subsystem are all connected into a common bus, and the water-light storage system is connected into a sending-out circuit through the bus, so that grid-connected operation of the water-light storage system is realized. The energy management system detects the running conditions of the photovoltaic power generation system, the hydropower station subsystem and the variable-speed constant-frequency pumped storage power station subsystem through communication lines and issues running scheduling instructions.
The control method of the water light storage system comprises the following steps:
1. smooth control of output power of photovoltaic power generation subsystem
The energy management system collects the power generation power of the photovoltaic power generation subsystem in real time. Because the photovoltaic power generation subsystem is greatly influenced by sunlight, ambient temperature and cloud layer thickness, the output power of the photovoltaic power generation subsystem has high randomness, intermittence and fluctuation. For this purpose, a smooth power coefficient T of the photovoltaic power generation system is set in the energy management system. After power smooth control, the output power of the photovoltaic power generation subsystem is as follows:
wherein p ispv_cThe output power of the photovoltaic power generation subsystem after smooth power control is realized, T is a smooth power coefficient, s is a transfer function variable and ppvPhotovoltaic systemThe output power of the power generation subsystem.
The power response time and the smooth control effect of the variable-speed constant-frequency pumped storage power station subsystem are considered in the establishment of the T value, and the value is generally 1-100 times of the power response time of the variable-speed constant-frequency pumped storage power station subsystem.
2. Limiting large-range fluctuation of generated power of photovoltaic power generation subsystem
In order to prevent the large-range fluctuation of the generated power of the photovoltaic power generation subsystem, the variation rate of the generated power of the photovoltaic power generation subsystem is set not to exceed a%, and if the variation rate of the generated power of the photovoltaic power generation subsystem is greater than a%, the output power of the photovoltaic power generation subsystem is limited to p at the next momentpv_cAnd P is the rated output power of the photovoltaic power generation subsystem.
Wherein, Δ ppv_cFor the photovoltaic power generation subsystem power change rate, a is the set maximum photovoltaic power change rate, ppv_c(k +1) is the last moment of sampling the output power of the photovoltaic power generation subsystem, ppv_c(k) And the sampling value of the output power of the photovoltaic power generation subsystem at the moment is t, the sampling period of the energy management system is t, and k is the sampling moment.
3. Low-frequency part for compensating power fluctuation of photovoltaic power generation subsystem
Compared with the fluctuation of the generating power of the photovoltaic power generation subsystem, the response of the power regulation characteristic of the hydropower station subsystem is slower, so that the invention adopts the hydropower station subsystem to compensate the low-frequency part of the fluctuation of the generating power of the photovoltaic power generation subsystem, and according to the power response characteristic of the hydropower station subsystem, the fluctuation power of the hydropower station subsystem, which is compensated on the basis of the original output, of the photovoltaic power generation subsystem is as follows:
wherein, TsFor hydropower station subsystem power response timeM, ppv_sCompensating photovoltaic fluctuating power for a hydropower station subsystem, s being a transfer function variable, ppvAnd the output power of the photovoltaic power generation subsystem.
4. Compensating for high frequency portions of photovoltaic power generation subsystem power fluctuations
The variable-speed constant-frequency pumped storage power station subsystem adopts a back-to-back converter, and the power response speed is higher than that of the hydropower station subsystem. Therefore, the invention adopts the variable-speed constant-frequency pumped storage power station subsystem to compensate the high-frequency part of the power fluctuation of the photovoltaic power generation subsystem, and the power of the variable-speed constant-frequency pumped storage power station subsystem for compensating the power fluctuation of the photovoltaic power generation subsystem is as follows:
wherein, TsFor the power response time, p, of the hydropower station subsystempv_pCompensating the fluctuating power of the photovoltaic power generation subsystem for the pumped storage power station subsystem, wherein T is a smooth power coefficient, s is a transfer function variable, and ppvAnd the output power of the photovoltaic power generation subsystem.
The invention can realize the full compensation of the power fluctuation of the photovoltaic power generation subsystem by compensating the low-frequency part of the power fluctuation of the photovoltaic power generation subsystem through the hydropower station subsystem and compensating the high-frequency part of the power fluctuation of the photovoltaic power generation subsystem through the variable-speed constant-frequency pumped storage power station.
Drawings
FIG. 1 is a water light storage system topology;
FIG. 2 is a block diagram of a water light storage system smooth power control;
FIG. 3 is a flow chart of a smooth power control for a water light storage system.
The specific implementation mode is as follows:
the invention is further described below with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, the water-light storage system to which the present invention is applied includes a photovoltaic power generation subsystem, a hydropower station subsystem, a variable speed constant frequency pumped storage power station subsystem, and an energy management system. The photovoltaic power generation subsystem comprises a photovoltaic component and an inverter; the hydroelectric power generation subsystem comprises a water turbine and a synchronous generator; the variable-speed constant-frequency pumped storage subsystem comprises a water pump turbine, a synchronizer and a back-to-back converter: including AC/DC and DC/AC converters. The energy management system detects the running conditions of the photovoltaic power generation system, the hydropower station subsystem and the variable-speed constant-frequency pumped storage power station subsystem through communication lines and issues running scheduling instructions. The photovoltaic power generation subsystem, the hydropower station subsystem and the variable-speed constant-frequency pumped storage power station subsystem are connected into a common bus, and the water-light storage system is connected to the grid through the bus connection and the transmission line.
The control method of the water light storage system comprises the following steps:
1. smooth control of output power of photovoltaic power generation subsystem
Energy management system collects power p generated by photovoltaic power generation subsystem in real timepv. Because the photovoltaic power generation is greatly influenced by sunlight, ambient temperature and cloud layer thickness, the photovoltaic power generation power has great randomness, intermittence and fluctuation. According to the invention, a smooth power coefficient T of a photovoltaic power generation subsystem is set in an energy management system, and after power smooth control, the output power of the photovoltaic power generation subsystem is as shown in the formula (1):
wherein p ispv_cThe output power of the photovoltaic power generation subsystem after smooth power control is realized, T is a smooth power coefficient, s is a transfer function variable and ppvAnd the output power of the photovoltaic power generation subsystem.
The power response time and the smooth control effect of the variable-speed constant-frequency pumped storage power station subsystem are considered in the establishment of the T value, and the value is generally 1-100 times of the power response time of the variable-speed constant-frequency pumped storage power station subsystem.
2. In order to limit the wide-range fluctuation of the photovoltaic power generation sub-power, the power change rate of the photovoltaic power generation sub-system is set to be not more than a%, and if the power change rate of the photovoltaic power generation sub-system is more than a%, the photovoltaic power generation sub-system output at the next moment is outputPower limited to ppvAnd +/-P multiplied by a%, wherein P is the rated output power of the photovoltaic power generation subsystem.
Wherein, Δ ppv_cFor the photovoltaic power generation subsystem power change rate, a is the set maximum photovoltaic power change rate, ppv_c(k +1) is the last moment of sampling the output power of the photovoltaic power generation subsystem, ppv_c(k) And the sampling value of the output power of the photovoltaic power generation subsystem at the moment is t, the sampling period of the energy management system is t, and k is the sampling moment.
3. In order to inhibit the power fluctuation of the photovoltaic power generation subsystem and smooth the power fluctuation of the photovoltaic power generation subsystem, the power required to be compensated by the hydropower station subsystem and the pumped storage power station subsystem is as follows:
wherein p ispv_bAnd the power compensated by the hydropower station subsystem and the pumped storage power station subsystem is provided.
4. Compared with photovoltaic power fluctuation, the hydropower station subsystem is adopted to compensate the low-frequency part of the photovoltaic power generation subsystem power fluctuation because the hydropower station subsystem has slow power regulation characteristic response. According to the power response characteristic of the hydropower station subsystem, the fluctuation power of the photovoltaic power generation subsystem is compensated by the hydropower station subsystem on the basis of the original output:
wherein, TsFor the power response time, p, of the hydropower station subsystempv_sCompensating photovoltaic fluctuating power for a hydropower station subsystem, s being a transfer function variable, ppvAnd the output power of the photovoltaic power generation subsystem.
5. The variable-speed constant-frequency pumped storage power station adopts back-to-back converters, and the power response speed is higher than that of a hydropower station subsystem, so that the variable-speed constant-frequency pumped storage power station subsystem is adopted to compensate the high-frequency part of the power fluctuation of the photovoltaic power generation subsystem. The power of the variable-speed constant-frequency pumped storage power station subsystem for compensating the fluctuation of the photovoltaic power generation subsystem is obtained by subtracting the formula (4) from the formula (3):
wherein: p is a radical ofpv_pCompensating the fluctuating power of the photovoltaic power generation subsystem for the pumped storage power station subsystem, wherein T is a smooth power coefficient, s is a transfer function variable, and ppvAnd the output power of the photovoltaic power generation subsystem.
Claims (1)
1. A water-light storage system control method is applied, and the water-light storage system applying the control method comprises a photovoltaic power generation subsystem, a hydropower station subsystem, a variable-speed constant-frequency pumped storage power station subsystem and an energy management system; photovoltaic power generation subsystem, power station subsystem, variable speed constant frequency pumped storage power station subsystem all insert public generating line, send out the circuit through the bus access, realize the operation of being incorporated into the power networks of water light storage system, its characterized in that: the control method comprises the following steps:
(1) smooth control of output power of photovoltaic power generation subsystem
The energy management system collects the power generation power of the photovoltaic subsystem in real time; setting a smooth power coefficient T of the photovoltaic power generation system in the energy management system, and after power smooth control, outputting power of the photovoltaic power generation subsystem as follows:
wherein p ispv_cThe output power of the photovoltaic power generation subsystem after smooth power control is performed, T is a smooth power coefficient, and the power response time and the smooth control effect of the variable-speed constant-frequency pumped storage power station subsystem are considered in the establishment of the value of TThe value is 1-100 times of the power response time of the variable-speed constant-frequency pumped storage power station subsystem, s is a transfer function variable and p ispvThe output power of the photovoltaic power generation subsystem;
(2) limiting large-range fluctuation of generated power of photovoltaic power generation subsystem
In order to prevent the large-range fluctuation of the generated power of the photovoltaic subsystem, the variation rate of the generated power of the photovoltaic subsystem is set not to exceed a%, and if the variation rate of the generated power of the subsystem is greater than a%, the output power of the photovoltaic power generation subsystem is limited to p at the next momentpv_cThe power is controlled to be within +/-Pxa%, and P is the rated output power of the photovoltaic power generation subsystem;
wherein, Δ ppv_cFor the photovoltaic power generation subsystem power change rate, a is the set maximum photovoltaic power change rate, ppv_c(k +1) is the last moment of sampling the output power of the photovoltaic power generation subsystem, ppv_c(k) The sampling value of the output power of the photovoltaic power generation subsystem at the moment is t, the sampling period of the energy management system is t, and k is the sampling moment;
(3) low-frequency part for compensating power fluctuation of photovoltaic power generation subsystem
Compensating a low-frequency part of the generated power fluctuation of the photovoltaic subsystem by adopting a hydropower station subsystem; according to the power response characteristic of the hydropower station subsystem, the power fluctuation power of the photovoltaic subsystem is compensated by the hydropower station subsystem on the basis of the original output:
wherein, TsFor the power response time, p, of the hydropower station subsystempv_sCompensating photovoltaic fluctuating power for a hydropower station subsystem, s being a transfer function variable, ppvThe output power of the photovoltaic power generation subsystem;
(4) high-frequency part for compensating power fluctuation of photovoltaic power generation subsystem
The variable-speed constant-frequency pumped storage power station subsystem is adopted to compensate the high-frequency part of the power fluctuation of the photovoltaic power generation subsystem, and the power of the variable-speed constant-frequency pumped storage power station subsystem for compensating the power fluctuation of the photovoltaic power generation subsystem is as follows:
wherein, TsFor the power response time, p, of the hydropower station subsystempv_pCompensating photovoltaic fluctuating power for pumped storage power station subsystem, wherein T is smooth power coefficient, s is transfer function variable, and ppvAnd the output power of the photovoltaic power generation subsystem.
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| CN113489000B (en) * | 2021-07-14 | 2023-08-08 | 河海大学 | Method for restraining low-frequency oscillation of water-light complementary energy base |
| CN114825439B (en) * | 2022-05-07 | 2022-12-06 | 阿坝水电开发有限公司 | Photovoltaic and pumped storage coordinated control method and system |
| CN114678897B (en) * | 2022-05-11 | 2022-10-14 | 阿坝水电开发有限公司 | Coordination control method for hybrid hydropower and photovoltaic |
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| JP2007259545A (en) * | 2006-03-22 | 2007-10-04 | Tokyo Electric Power Co Inc:The | System frequency urgent correction method by supply and demand control system |
| JP6220241B2 (en) * | 2013-01-11 | 2017-10-25 | 株式会社東芝 | Control device and control method for variable speed pumped storage power generation system |
| CN103401265B (en) * | 2013-07-03 | 2016-05-04 | 国家电网公司 | Pumped storage unit change working compensating control method based on AGC |
| CN104037792B (en) * | 2014-06-16 | 2016-04-06 | 清华大学 | The control method of honourable power fluctuation is stabilized in a kind of water power and energy storage |
| CN105375512B (en) * | 2015-11-06 | 2018-01-30 | 重庆大学 | The power coordination control method of hybrid energy-storing in light storing cogeneration system |
| JP6446569B2 (en) * | 2015-12-24 | 2018-12-26 | 日立三菱水力株式会社 | Variable speed pumped storage power generator |
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| CN108667053B (en) * | 2018-05-18 | 2021-02-05 | 华北电力大学 | Working condition switching simulation implementation method for water pump turbine and double-fed motor of pumped storage power station |
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