GB2561273A - Generated power control system and control method for intelligent micro-grid with medium energy storage - Google Patents
Generated power control system and control method for intelligent micro-grid with medium energy storage Download PDFInfo
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- GB2561273A GB2561273A GB1719021.6A GB201719021A GB2561273A GB 2561273 A GB2561273 A GB 2561273A GB 201719021 A GB201719021 A GB 201719021A GB 2561273 A GB2561273 A GB 2561273A
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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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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/10—The network having a local or delimited stationary reach
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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
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Wind Motors (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A generated power control system and control method for an intelligent micro-grid with medium energy storage. The control system mainly comprises a wind-solar hybrid power generation system, a solar thermal power generation set with medium energy storage, and a micro-grid power control system. The control method comprises: a micro-grid centralized control center receives in real time a power instruction transmitted from a micro-grid dispatching automation system, and collects in real time the generated power of the wind-solar hybrid power generation system; an energy management system calculates an optimal power distribution scheme of a micro-grid. According to the power distribution scheme, stable output of the generated power of the micro-grid is implemented by performing coordinated control on heat storage and heat release rates of a heat storage system, and the generated power of the solar thermal power generation set. By means of the control method, the technical defects, such as uncontrollability, discontinuity, and large fluctuation of wind energy and solar generated power that are caused by the change in an external environment, can be overcome, the generated power of the micro-grid is stabilized, electric energy of a new energy can be consumed to the greatest extent, and the problems of "wind curtailment" and "light curtailment" in the new energy can be effectively solved.
Description
(56) Documents Cited:
CN 204555418 U CN 105470982 A CN 104734168 A
CN 202435048 U CN 104807204 A US 20110035070 A1 (58) Field of Search:
INT CL H02J
Other: CNKI, CNPAT, WPI, EPODOC (87) International Publication Data:
WO2017/107246 Zh 29.06.2017 (71) Applicant(s):
Beijing Sifang Automation Co., Ltd
No.9, 4th St., Shangdi Information Industry Base,
Haidian District, Beijing 100085, China (72) Inventor(s):
Gang Sun Bonian Shi Xiaoyan Sun Zhichao Liu (continued on next page) (54) Title of the Invention: Generated power control system and control method for intelligent micro-grid with medium energy storage
Abstract Title: Generated power control system and control method for intelligent micro-grid with medium energy storage (57) A generated power control system and control method for an intelligent micro-grid with medium energy storage.
The control system mainly comprises a wind-solar hybrid power generation system, a solar thermal power generation set with medium energy storage, and a micro-grid power control system. The control method comprises: a micro-grid centralized control center receives in real time a power instruction transmitted from a micro-grid dispatching automation system, and collects in real time the generated power of the wind-solar hybrid power generation system; an energy management system calculates an optimal power distribution scheme of a microgrid. According to the power distribution scheme, stable output of the generated power of the micro-grid is implemented by performing coordinated control on heat storage and heat release rates of a heat storage system, and the generated power of the solar thermal power generation set. By means of the control method, the technical defects, such as uncontrollability, discontinuity, and large fluctuation of wind energy and solar generated power that are caused by the change in an external environment, can be overcome, the generated power of the micro-grid is stabilized, electric energy of a new energy can be consumed to the greatest extent, and the problems of wind curtailment and light curtailment in the new energy can be effectively solved.
AA Micro- grid generated power control strategy
BB No
CC Isolated-grid operation
DD Turn off the grid-connected switch of a wind-solar power generation system
EE Does energy storage capacity reach a threshold
FF Turn on a power-to-heat grid-connected switch
GG A heat storage system stores heat
HH Turn off the power-to-heat grid-connected switch II The heat storage system releases heat J J Coordinate the output of the solar thermal set
KK Maintain the power load of a micro-grid balanced LL Turn on a grid-connected switch MM Yes
NN Grid-connected operation
OO Turn on the grid-connected switch of the wind-solar power generation system
FP Give a planned generated power value by grid dispatching QO Is planned power greater than wind-solar generated power RR PI controller
SS Add the output of the solar thermal set
TT Reduce the output of the solar thermal set
UU Is the adjustment capability of the solar thermal set exceeded VV Start a power-to-heat system WW Maintain grid-connected power stable
GB 2561273 A continuation (74) Agent and/or Address for Service:
HGF Limited
Document Handling - HGF - (Sheffield), 1 City Walk, LEEDS, LS11 9DX, United Kingdom
. jstU&s_Osl<L siss<___j-ysunt— nc. 1 etiicntary power generation system
I
1/2 generated power s eont. ro 1 strategy of ffiicro-grid
switch off grid connectiep switch of wind-solar f power generation system gr i d - c ori n e c i; e d operation:
.witch on grid connection switch of wi fid-solar power generation system
grid dispatches given planned generated, power value
inned power high.er than wind s
,x no / stored heat ----roaches the limit?
switch on the e 1 ec i: r i c - t herma .1 grid connection sMt di1 el ec tr i c~ther»fel grid connecting neat storage System stores heat
Me'af storage system releases heat
coordinate outputj of solar thermal generator set maintain balance of power consumpt ion of the micro-grid
-^generated power- increase output •of solar thermal
no maintain no
Pl controller : decrease output I of solar thermal generator set
adjustment
Xai&pabilit# <?· ;.·!.> 1 e electric-thermal system grid-connected j.power stable
v
FIG.
2/2
Description
Generated power control system and control method for intelligent micro-grid with medium energy storage
Technical Field
The present application relates to the technical field of distributed power generation and micro-grid, and more particularly to an intelligent micro-grid control system and method using wind power, photovoltaic, solar thermal and high-capacity medium heat storage.
Background Art
Wind power and photovoltaic power generations, considered as the representatives of the new energy, have made great development in recent years. However, due to the changing weather conditions, their generated power fluctuates greatly, which especially is embodied in that direct grid connection of the large-scale centralized new energy power plant may generate a greater impact on the grid. Therefore, “wind curtailment and “solar curtailment occur in many areas in China. To solve this phenomenon, China is vigorously developing a micro-grid system taking a distributed power supply as the core, to consume wind power, photovoltaic power on the site. The micro-grid is a small-sized low-voltage distribution system composed of a distributed power supply, energy storage and a load. As an effective carrier of the distributed power supply, the micro-grid can achieve the self-balancing of internal power of the micro-grid, and also can connect with the main power grid and transmit power bidirectionally.
In order to suppress the fluctuation of the new energy generated power in the micro-grid, the distributed power supply, the micro-grid load and the energy storage system can be coordinately controlled in order to maintain the power balance of the micro-grid. In the practical application, control of the distributed power and micro-grid load will inevitably lead to wind curtailment, solar curtailment, micro-grid load rejection and other phenomena. The above-mentioned problem can be effectively solved by the method of controlling the energy storage system to suppress the power fluctuation. The currently common micro-grid energy storage methods mainly refer to chemical energy storage and mechanical energy storage, in which chemical energy storage, such as storage battery energy storage, super capacitor energy storage and other methods, can be well controlled, but has limited total storage energy and high cost, while mechanical energy storage, such as flywheel energy storage, water pumping energy storage and other methods, has high energy storage capacity, but is low in energy conversion efficiency and is subject to geographical conditions, technology and other factors. The application of a medium energy storage unit, especially the gradual maturation of a solar thermal power generation set comprising a medium heat storage unit, has become a new direction for the utilization of micro-grid energy storage in recent years. Its advantage is that the heat storage device can store a lot of heat energy and has excellent schedulability, in which a turboset has good controllability, and its thermoelectric conversion part is the same as that of the conventional thermal generator set, there are relatively mature technologies for use; therefore, it is one of the most promising power generation forms of renewable energy power generation. In the case of combination with the wind power, photovoltaic and other distributed power supplies for use, the problem of large power fluctuation of wind and solar power generation can be effectively solved, and the formed novel micro-grid has the advantages of flexible control, output stability, low power generation cost, high energy efficiency and the like.
Summary of the Invention
An objective of the present application is to provide a control system and method for suppressing generated power fluctuation of a micro-grid using a solar thermal generator set with medium energy storage.
In order to solve the technical problem, the following technical solution is specifically applied to the present application:
a generated power control system for an intelligent micro-grid with medium energy storage, the intelligent micro-grid being connected with a power distribution network through a main grid switch and connected with a micro-grid load through a load grid connection switch, characterized in that the intelligent micro-grid includes a wind-solar complementary power generation system, a solar thermal generator set, a medium heat storage system, and a power control system;
the wind-solar complementary power generation system is connected to an output bus of the intelligent micro-grid through a grid connection switch of the wind-solar complementary power generation system and is connected to the medium heat storage system through an electric-to-thermal switch;
the solar thermal generator set comprises a solar thermal turbine and a solar thermal generator, the solar thermal turbine drives the solar thermal generator to generate power, the medium heat storage system and a solar thermal mirror field are both connected to the input end of the solar thermal turbine, and the solar thermal generator is connected to the output bus of the intelligent micro-grid through a grid connection switch of the solar thermal generator set; and the power control system monitors the power values of the wind-solar complementary power generation system, the micro-grid load and the solar thermal generator set in real time, receives a power instruction transmitted by the micro-grid dispatching automation system, optimizes the distribution of generated energy of the wind-solar complementary power generation system and the solar thermal generator set and the stored heat of the medium heat storage system.
The present invention further preferably comprises the following solution:
The wind-solar complementary power generation system comprises a plurality of wind turbine generator sets and photovoltaic generator sets, the output ends of the wind turbine generator sets and the photovoltaic generator sets are connected to a bus of the complementary power generation system and then connected to the electric-to-thermal switch and the grid connection switch of the wind-solar complementary power generation system through a boosting transformer.
The power control system first ensures preferred power generation of the windsolar complementary power generation system, and stabilizes the generated power of the micro-grid by adjusting the output of the solar thermal generator set and the heat storage and heat release rates of the medium heat storage system.
The present application further discloses a generated power control method for an intelligent micro-grid with medium energy storage, characterized in that the power control system for the intelligent micro-grid receives a power instruction transmitted from a micro-grid dispatching automation system in real time, collects the generated power of the wind-solar complementary power generation system and the solar thermal generator set in real time, detects the stored heat of the medium heat storage system, and carries out coordination control on heat storage and heat release rates of the heat storage system, and the generated power of the solar thermal generator set and the wind-solar complementary power generation system to achieve the stable output of the generated power of the micro-grid.
The generated power control system for the intelligent micro-grid with medium energy storage comprises the following steps:
(1) monitoring, by an intelligent micro-grid power control system, the operation state of a main grid connection switch of the intelligent micro-grid, and when the main grid connection switch is switched off, allowing the intelligent micro-grid to enter in an isolated grid operation mode and then proceeding to step (2); and when the main grid connection switch is switched on, allowing the intelligent micro-grid to enter in the grid-connected operation mode, and then proceeding to step (5);
(2) switching off a grid connection switch of the wind-solar complementary power generation system;
(3) detecting the stored heat of the medium heat storage system, and if the stored heat does not exceed a preset threshold, switching on the electric-to-thermal switch and storing the generated power of the wind-solar complementary power generation system in the medium heat storage system, and then proceeding to step (4); if the stored heat exceeds the preset threshold, switching off the electric-to-thermal switch and disabling the wind-solar complementary power generation system, and then proceeding to step (4);
(4) exchanging, by the medium heat storage system, heat from a medium to hightemperature steam to impel the solar thermal turbine to drive the solar thermal generator to generate power; monitoring, by the intelligent micro-grid power control system, the change of the micro-grid load power in real time and adjusting the output of the solar thermal system and maintaining the balance of consumed power of the intelligent micro-grid;
(5) switching on the grid connection switch of the wind-solar complementary power generation system;
(6) collecting, by the intelligent micro-grid power control system, the power values of the wind-solar complementary power generation system, the micro-grid load and the solar thermal generator set in real time, and receiving a planned generated power instruction transmitted by the micro-grid dispatching automation system;
(7) proceeding to step (8) when the planned generated power instruction transmitted by the micro-grid dispatching automation system is higher than the real-time generated power of the wind-solar complementary power generation system, or otherwise proceeding to step (9);
(8) calculating, by the intelligent micro-grid power control system, required generated power increase of the solar thermal generator set and controlling the solar thermal generator set, by a PI controller, to increase the output to maintain the balance between the grid-connected power of the intelligent micro-grid and the planned generated power; and (9) calculating, by the intelligent micro-grid power control system, required generated power decrease of the solar thermal generator set and controlling the solar thermal generator set, by a PI controller, to decrease the output; and when the required generated power decrease of the solar thermal generator set exceeds the adjustment capability of the solar thermal generator set, switching on the electric-to-thermal switch to store the surplus generated power of the wind-solar complementary power generation system in the medium heat storage system.
The present invention has the following advantageous technical effects: the microgrid power control method is suitable for the grid-connected operation and the isolated grid operation modes of the micro-grid, can meet the requirements of real-time grid scheduling and micro-network load, can effectively suppress the power fluctuations of the micro-grid and take into account the reliability of power supply as well, can effectively avoid the phenomena of “wind curtailment” and “solar curtailment” occurring in the distributed new energy grid connection, and can guarantee the longterm, safe and stable operation of the micro-grid, thus prolong the service life of equipment.
Brief Description of the Drawings
Fig. 1 is an architectural diagram of a generated power control system for an 5 intelligent micro-grid with medium energy storage according to this application;
Fig. 2 illustrates a generated power PI controller of the micro-grid; and
Fig. 3 is a flow chart of a generated power control method for an intelligent microgrid with medium energy storage according to this application.
Detailed Description of the Embodiments
The technical solution of the present invention will be further described hereinafter in detail through embodiments with reference to the accompanying drawings of the description.
This application takes a micro-grid system capable of generating power stably with combination of wind power, photovoltaic and solar thermal, as shown in Fig. 1, as an embodiment. However, this embodiment may be embodied in many different forms and should not be construed as being limited to the exemplary embodiment described herein. Instead, these embodiments are provided so that the invention may be more fully conveyed to those skilled in the art.
The micro-grid system as described in the embodiment has a primary' topological structure as follow.
The wind-solar complementary power generation system is connected to the output bus of a lOkV micro-grid through a common boosting transformer and a circuit breaker. The solar thermal mirror field converts the received solar energy into hightemperature steam which is then transmitted to the solar thermal turbine and the medium energy storage system. The generator end of the solar thermal generator set with medium energy storage is connected to the output bus of the lOkV micro-grid through one circuit breaker; the output bus of the micro-grid is connected to a 35kV main grid through a grid-connected circuit breaker and is connected to an electric load of the micro-grid through a load circuit breaker; the output bus of the micro-grid is interconnected with an electric-to-thermal device through an electric-to-thermal transformer and an electric-to-thermal switch, and the surplus electric energy of the wind-solar complementary power generation system, which cannot be subject to grid connection, can be converted into heat energy for storage.
In the embodiment, the wind-solar complementary power generation system has a rated power generation capacity of 15MW; the thermal power capacity of the solar 6 thermal mirror field is 30MW; the rated capacity of the solar thermal generator is 15MW, and the speed of power increase and decrease is at most to adjust 5% of the rated capacity of the generator set per minute, that is, the maximum power regulation per minute is 0.75MW; the medium heat storage system is divided into three heat storage tanks, each heat storage tank has a designed heat storage capacity of 240MWh, the total stored heat can support the solar thermal generator to run at full power to generate power for 48 hours; a heater in the electric-to-thermal system is close to the pure resistive load, has fast response speed and thus can consume the electric power quickly. The heater in each heat storage tank has a heating power of 5MW, with the minimum heating power adjusting gear of 1MW; the heat storage system has the maximum synchronous heating power of 15MW, and the electric-to-thermal switch is switched off when the heat storage capacity of each heat storage tank reaches 240MWh.
Fig. 3 shows a flow chart of a generated power control method for an intelligent micro-grid with medium energy storage according to the present invention, wherein the generated power control method for the intelligent micro-grid comprises the following steps:
(1) the operation state of a main grid connection switch of the intelligent microgrid is monitored; when the main grid connection switch is switched off, the intelligent micro-grid enters in an isolated grid operation mode and then the method proceeds to step (2); and when the main grid connection switch is switched on, the intelligent microgrid enters in the grid-connected operation mode, and then the flow proceeds to step (5);
(2) a grid connection switch of the wind-solar complementary power generation system is switched off;
(3) the stored heat of the medium heat storage system is detected; if the stored heat does not exceed the heat storage capacity of 240MWh for each heat storage tank, the electric-to-thermal switch is switched on and the generated power of the wind-solar complementary power generation system is stored in the medium heat storage system, and then the method proceeds to step (4); if the stored heat exceeds the heat storage capacity of 240MWh for each heat storage tank, the electric-to-thermal switch is switched off and the wind-solar complementary power generation system is disabled,
Ί and then the method proceeds to step (4);
(4) the medium heat storage system exchanges heat into high-temperature steam to impel the solar thermal turbine to drive the solar thermal generator to generate power; the intelligent micro-grid power control system monitors the change of the load power in the micro-grid in real time and adjusts the output of the solar thermal system to maintain the balance of electric loads of the intelligent micro-grid.
(5) the grid connection switch of the wind-solar complementary power generation system is switched on;
(6) the intelligent micro-grid power control system collects the power values of the wind-solar complementary power generation system, the micro-grid load and the solar thermal generator set in real time, and receives a planned generated power instruction transmitted by the micro-grid dispatching automation system; it is assumed the stable grid-connected electric quantity of the micro-grid, required by the main grid, is 20MW, and the allowable power fluctuation range is ±3%, i.e., ±0.6MW, wherein given at a certain time, the generated power of the wind-solar complementary power generation system is 15MW and the generated power of the solar thermal generator set is 5MW, then the total grid-connected power of the micro-grid is 20MW; when the generated power of the wind-solar complementary power generation system suddenly fluctuates downward at a rate of 0.75MW/min in the case of change of the whether condition, after the power control system monitors power increase of the wind-solar complementary power generation system, the method proceeds to step (8);
(7) when the generated power of the wind-solar complementary power generation system suddenly fluctuates upward at a rate of 1.5MW/min in the case of change of the whether condition, after the power control system monitors power increase of the windsolar complementary power generation system, the method proceeds to step (8), wherein the maximum climbing rate of the solar thermal generator set is 0.75MW/min, and when this rate is exceeded, the solar thermal generator is not enough for adjustment, and then he flow goes to step (9);
(8) the intelligent micro-grid power control system calculates the power change according to the difference between the planned power and the current power; after adjusting by the PI controller as shown in Fig. 2, the output of the solar thermal generator can be increased in real time by releasing a control instruction, to stabilize the output power of the micro-grid, wherein the maximum climbing speed of the solar thermal generator set is 0.75MW/min, i.e., the grid-connected power of the micro-grid can be maintained at 20MW at this moment; and (9) the intelligent micro-grid power control system calculates the required generated power decrease of the solar thermal generator set and controls the solar thermal generator set by a PI controller to decrease the output; and when the required generated power decrease of the solar thermal generator set exceeds the adjustment capability of the solar thermal generator set by 0.75MW/min, the electric-to-thermal switch is switched on to store the surplus generated power of the wind-solar complementary power generation system in the medium heat storage system and the grid-connected power of the micro-grid is maintained at 20MW; as the heaters can quickly consume surplus power, as long as the heat storage tanks can still store power, it will not lead to the occurrence of phenomena of wind curtailment and solar curtailment.
The applicant has described the embodiments of the present invention in detail with reference to the accompanying drawings; however, those skilled in the art will appreciate that the above embodiments are merely exemplary embodiments of the present invention and that the detailed description is merely intended to assist the reader to better understand the spirit of the present invention, but not to limit the protection scope of the present invention, and that, instead, any improvements or modifications made on the basis of the spirit of the present invention are intended to fall within the scope of the invention.
Claims (4)
1. A generated power control system for an intelligent micro-grid with medium energy storage, the intelligent micro-grid being connected with a power distribution network through a main grid switch and connected with a micro-grid load through a load grid connection switch, characterized in that the intelligent micro-grid comprises a wind-solar complementary power generation system, a solar thermal generator set, a medium heat storage system, and a power control system;
the wind-solar complementary power generation system is connected to an output bus of the intelligent micro-grid through a grid connection switch of the wind-solar complementary power generation system and is connected to the medium heat storage system through an electric-to-thermal switch;
the solar thermal generator set comprises a solar thermal turbine and a solar thermal generator, the solar thermal turbine drives the solar thermal generator to generate power, the medium heat storage system and a solar thermal mirror field are both connected to an input end of the solar thermal turbine, and the solar thermal generator is connected to the output bus of the intelligent micro-grid through a grid connection switch of the solar thermal generator set; and the power control system monitors in real time the power values of the wind-solar complementary power generation system, the micro-grid load and the solar thermal generator set, receives a power instruction transmitted from the micro-grid dispatching automation system, optimizes distribution of generated energy of the wind-solar complementary power generation system and the solar thermal generator set and distribution of the stored heat of the medium heat storage system.
2. The generated power control system for the intelligent micro-grid according to claim 1, characterized in that the wind-solar complementary power generation system comprises a plurality of wind turbine generator sets and photovoltaic generator sets, the output ends of the wind turbine generator sets and the photovoltaic generator sets are connected to a bus of the complementary power generation system and then connected to the electric-to-thermal switch and the grid connection switch of the wind-solar complementary power generation system through a boosting transformer;
the power control system ensures power generation being made by the wind-solar complementary power generation system first, and stabilizes the generated power of the microgrid by adjusting the output of the solar thermal generator set and the heat storage and heat release rate of the medium heat storage system.
3. A generated power control method for an intelligent micro-grid with medium energy storage, characterized in that the power control system for the intelligent micro-grid receives in real time a power instruction transmitted from a micro-grid dispatching automation system, collects in real time the generated power of the wind-solar complementary power generation system and the solar thermal generator set, detects the stored heat of the medium heat storage system, and carries out coordination control on heat storage and heat release rate of the heat storage system and the generated power of the solar thermal generator set and the wind-solar complementary power generation system to achieve a stable output of the generated power of the micro-grid.
4. The generated power control method for the intelligent micro-grid according to claim 3, comprising the following steps:
(1) monitoring, by the power control system for the intelligent micro-grid, the operation state of a main grid connection switch of the intelligent micro-grid, and when the main grid connection switch is switched off, the intelligent micro-grid entering in an isolated grid operation mode and then proceeding to step (2); and when the main grid connection switch is switched on, the intelligent micro-grid entering in a grid-connected operation mode, and then proceeding to step (5);
(2) switching off a grid connection switch of the wind-solar complementary power generation system;
(3) detecting the stored heat of the medium heat storage system, and if the stored heat does not exceed a preset threshold, switching on the electric-to-thermal switch and storing the generated power of the wind-solar complementary power generation system in the medium heat storage system, and then proceeding to step (4); if the stored heat exceeds the preset threshold, switching off the electric-to-thermal switch and disabling the wind-solar complementary power generation system, and then proceeding to step (4);
(4) exchanging, by the medium heat storage system, heat from a medium to high12 temperature steam to impel the solar thermal turbine to drive the solar thermal generator to generate power; monitoring, by the power control system for the intelligent micro-grid, the change of the micro-grid load power in real time and adjusting the output of the solar thermal system to maintain the balance of consumed power of the intelligent micro-grid.
(5) switching on the grid connection switch of the wind-solar complementary power generation system;
(6) collecting, by the power control system for the intelligent micro-grid, the power values of the wind-solar complementary power generation system, the micro-grid load and the solar thermal generator set in real time, and receiving a planned generated power instruction transmitted from the micro-grid dispatching automation system;
(7) proceeding to step (8) when the planned generated power determined by the micro-grid dispatching automation system is higher than the real-time generated power of the wind-solar complementary power generation system; otherwise, proceeding to step (9);
(8) calculating, by the power control system for the intelligent micro-grid, the required generated power increase of the solar thermal generator set and controlling the solar thermal generator set, by a PI controller, to increase its output to maintain balance between the gridconnected power of the intelligent micro-grid and the planned generated power; and (9) calculating, by the power control system for the intelligent micro-grid, the required generated power decrease of the solar thermal generator set and controlling the solar thermal generator set, by a PI controller, to decrease its output; and when the required generated power decrease of the solar thermal generator set exceeds the adjustment capability of the solar thermal generator set, switching on the electric-to-thermal switch to store the surplus generated power of the wind-solar complementary power generation system in the medium heat storage system.
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| CN201510993996.5A CN105470982B (en) | 2015-12-25 | 2015-12-25 | The intelligent micro-grid generated power control system and control method of a kind of energy storage containing medium |
| PCT/CN2016/000317 WO2017107246A1 (en) | 2015-12-25 | 2016-06-17 | Generated power control system and control method for intelligent micro-grid with medium energy storage |
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