WO2017107246A1 - 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 PDF

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Publication number
WO2017107246A1
WO2017107246A1 PCT/CN2016/000317 CN2016000317W WO2017107246A1 WO 2017107246 A1 WO2017107246 A1 WO 2017107246A1 CN 2016000317 W CN2016000317 W CN 2016000317W WO 2017107246 A1 WO2017107246 A1 WO 2017107246A1
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Prior art keywords
power generation
grid
power
wind
photothermal
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PCT/CN2016/000317
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French (fr)
Chinese (zh)
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孙刚
时伯年
孙晓彦
刘志超
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北京四方继保自动化股份有限公司
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Priority to GB1719021.6A priority Critical patent/GB2561273B/en
Publication of WO2017107246A1 publication Critical patent/WO2017107246A1/en

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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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

Definitions

  • the present application belongs to the field of distributed generation and microgrid technology, and particularly relates to a smart microgrid control system and a control method for wind power, photovoltaic, photothermal and large-capacity medium heat storage.
  • New energy represented by wind power and photovoltaic power generation, has made tremendous progress in recent years.
  • its power generation power fluctuates greatly, especially in the direct grid connection of large-scale centralized new energy power plants, which will have a greater impact on the power grid. Therefore, in many areas of China, the phenomenon of “abandoning the wind” and “abandoning the light” has appeared.
  • China is vigorously developing a microgrid system with distributed power as the core to achieve local consumption of wind power and photovoltaic power generation.
  • the microgrid is a small low-voltage power distribution system consisting of distributed power, energy storage and load. As an effective carrier of distributed power, it can realize the self-balancing of the internal power of the micro-grid, and can be connected to the main power grid and transmit power in both directions.
  • microgrid load In order to stabilize the fluctuation of new energy generation power in the microgrid, distributed power, microgrid load and energy storage system can be coordinated and controlled to maintain the balance of microgrid power. In practical applications, the control of distributed power and microgrid load will inevitably lead to the phenomenon of wind abandonment, light abandonment and microgrid load shedding. By controlling the energy storage system to suppress power fluctuations, the above problems can be effectively solved.
  • the current common microgrid energy storage methods are mainly chemical energy storage and mechanical energy storage.
  • chemical energy storage such as battery energy storage, supercapacitor energy storage and other mode methods
  • mechanical energy storage such as flywheel energy storage, pumped storage, etc.
  • energy storage Large capacity, but low energy conversion efficiency and limited by geographical conditions, technology and other factors.
  • the application of the medium energy storage unit especially the gradual maturity of the photothermal generator set containing the medium heat storage unit, has become a new direction of energy storage and utilization of the microgrid in recent years.
  • the advantage is that the heat storage device can store a large amount of heat energy and has good performance.
  • Dispatching in which the steam turbine unit has good controllability, and its thermoelectric conversion part is the same as the conventional thermal power generating unit, and has relatively mature technology to utilize it. It is one of the most promising forms of power generation in renewable energy power generation. If it is combined with wind power, photovoltaic and other distributed power sources, it can effectively solve the problem of large fluctuations in wind power and solar power generation.
  • the new microgrid has the advantages of flexible control, stable output, low power generation cost and high energy utilization.
  • the purpose of the application is to provide a photothermal generator set containing medium energy storage to stabilize the microgrid Power fluctuation control system and control method.
  • a smart microgrid power generation control system with medium energy storage the smart microgrid is connected to a distribution network through a main power grid switch, and is connected to a microgrid load through a load grid connection switch, and is characterized by:
  • the smart microgrid includes a wind and solar hybrid power generation system, a photothermal generator set, a medium heat storage system, and a power control system;
  • the wind-solar hybrid power generation system is connected to the smart micro-grid output bus through the grid-connected switch of the wind-solar hybrid power generation system, and is connected to the medium heat storage system through the electric heat switch;
  • the photothermal generator set includes a photothermal steam turbine and a photothermal generator, and the photothermal steam turbine drives the photothermal generator to generate electricity, and the medium heat storage system and the photothermal mirror field are both connected to the input end of the photothermal steam turbine,
  • the photothermal generator is connected to the smart microgrid output bus through the grid switch of the photothermal generator set;
  • the power control system monitors the power values of the wind-solar hybrid power generation system, the micro-grid load and the photo-thermal generator set in real time, receives the power command issued by the micro-grid dispatching automation system, and optimizes the distribution of the wind-solar hybrid power generation system and the photo-thermal generator set. And the heat storage of the medium heat storage system.
  • the present invention still further preferably includes the following scheme:
  • the wind-solar hybrid power generation system includes a plurality of wind turbines and photovoltaic units.
  • the output ends of the wind turbines and the photovoltaic units are connected to the busbar of the wind-solar hybrid power generation system and then connected to the electric-to-heat switch and the wind-solar hybrid power generation system through the step-up transformer.
  • the power control system first ensures that the wind-solar hybrid power generation system preferentially generates power, and stabilizes the power generation of the micro-grid by adjusting the output of the photothermal generator set and the heat storage and heat release rate of the medium heat storage system.
  • the invention also discloses a smart microgrid power generation control method comprising medium energy storage, characterized in that:
  • the intelligent microgrid power control system receives the power command issued by the microgrid dispatching automation system in real time, and collects the power generation of the wind-solar hybrid power generation system and the photothermal generator set in real time, and detects the heat storage capacity of the medium heat storage system, and the heat storage system of the medium heat storage system
  • the heat storage, heat release rate, and the power generation of the CSP system and the wind-solar hybrid power generation system are coordinated to achieve stable output of the microgrid power generation.
  • the intelligent microgrid power generation control method with medium energy storage includes the following steps:
  • Intelligent micro-grid power control system The operating state of the main grid-connected switch of the intelligent micro-grid.
  • the smart micro-grid enters the isolated mode and enters step (2); when the main grid-connected switch is put into operation At the time, the smart micro-grid enters the grid-connected operation mode, and proceeds to step (5);
  • step ( 4) Detecting the heat storage capacity of the medium heat storage system, if the heat storage capacity does not exceed the preset limit value, input the electric heat switch, store the power generated by the wind-solar hybrid power generation system in the medium heat storage system, and then enter the step ( 4); if the stored heat exceeds the preset limit, the electric heat switch is turned off, the wind-solar hybrid power generation system is stopped, and then proceeds to step (4);
  • the medium heat storage system exchanges heat in the medium into the high temperature steam to drive the photothermal steam turbine to drive the photothermal generator to generate electricity, and the intelligent micro grid power control system monitors the change of the microgrid load power and adjusts the light in real time.
  • the output of the thermal system maintains the power balance of the smart microgrid;
  • the intelligent microgrid power control system collects the power values of the wind-solar hybrid power generation system, the micro-grid load and the photo-thermal generator set in real time, and receives the planned power generation command issued by the micro-grid dispatching automation system;
  • step (8) When the planned power generation power delivered by the power grid dispatching automation system is greater than the real-time power generation power of the wind and solar hybrid power generation system, proceed to step (8), otherwise proceed to step (9);
  • the intelligent microgrid power control system calculates the required power generation of the photothermal generator set, and controls the photothermal generator set to increase the output by the PI controller to maintain the balance between the smart microgrid grid-connected power and the planned power generation;
  • Intelligent microgrid power control system calculates the power generation of the photothermal generator set, and controls the photothermal generator set to reduce the output through the PI controller; when the photothermal generator set needs to reduce the generated power beyond the photothermal generator set
  • the electric heat switch is input to store the generated power of the redundant wind-solar hybrid power generation system in the medium heat storage system.
  • the micro grid power control method is applicable to the grid-connected operation and the isolated network operation mode of the micro grid, and can meet the real-time grid dispatching requirements and the microgrid load demand, and effectively suppress the micro grid.
  • the power fluctuations take into account the reliability of the power supply, and effectively solve the phenomenon of “discarding the wind” and “abandoning the light” in the network of distributed new energy, which can guarantee the long-term safe and stable operation of the micro-grid and prolong the service life of the equipment.
  • FIG. 1 is a structural diagram of a smart microgrid power generation control system with medium energy storage according to the present application
  • Figure 2 is a microgrid power PI controller
  • FIG. 3 is a flow chart of a method for controlling power generation of a smart microgrid containing medium energy storage according to the present application.
  • the present application takes the wind power, photovoltaic, photothermal and stable power generation microgrid system shown in FIG. 1 as an embodiment.
  • the present embodiments may be embodied in many different forms and should not be construed as being limited to the exemplary embodiments described herein. Rather, these embodiments are provided so that this disclosure will be more fully disclosed to those skilled in the art.
  • the wind-solar hybrid power generation system is connected to the output bus of the 10kV microgrid through a common step-up transformer and circuit breaker; the photothermal mirror converts the received light energy into high-temperature steam for the photothermal steam turbine and the medium energy storage system.
  • the end of the photothermal generator set of the medium energy storage is connected to the output bus of the 10kV microgrid through a circuit breaker; the output bus of the microgrid is connected to the 35kV main grid through the grid-connected circuit breaker, and the load circuit breaker and the microgrid are used.
  • the electrical load is connected; the micro-grid output bus and the electric heating device are connected to each other through an electric-to-heat transformer and an electric-to-heat switch, and the excess electric power that cannot be connected to the wind-solar hybrid power generation system is converted into heat energy for storage.
  • the rated power generation capacity of the wind-solar hybrid power generation system is 15MW; the thermal power capacity of the photothermal mirror field is 30MW; the rated capacity of the photothermal generator is 15MW, and the speed of increasing or decreasing the output is the fastest 5% of the rated capacity of the unit per minute. That is, the maximum regulation of 0.75MW per minute; the medium heat storage system is divided into three heat storage tanks, the heat storage capacity of each heat storage tank is designed to be 240MWh, and the total heat storage capacity can be used for 48 hours of full power generation of the photothermal generator; The heater in the electric heating system is close to the pure resistive load, and the response speed is fast, and the electric power can be quickly consumed. The heating power of the heater in each storage tank is 5MW, the minimum power adjustment gear is 1MW, and the maximum heating power of the heat storage system is 15MW. The heat storage capacity of each heat storage tank reaches 240MWh and then the electric heat switch is disconnected.
  • FIG. 3 is a flowchart of a method for controlling power generation of a smart microgrid containing medium energy storage according to the present invention.
  • the smart power grid power generation control method includes the following steps:
  • step (1) monitoring the running state of the main grid-connected switch of the smart micro-grid.
  • the smart micro-grid enters the isolated network operation mode, and proceeds to step (2);
  • the main grid-connected switch is turned on, the intelligence
  • the microgrid enters the grid-connected operation mode and proceeds to step (5);
  • Step (4) Detecting the heat storage capacity of the medium heat storage system. If the heat storage capacity does not exceed the heat storage capacity of 240MWh of each heat storage tank, the electric heat switch is input, and the power generated by the wind-solar hybrid power generation system is stored in the medium heat storage system, and then enters Step (4); if the stored heat exceeds the heat storage capacity of each storage tank 240MWh, the electric heat switch is disconnected, the wind and solar hybrid power generation system is stopped, and then proceeds to step (4);
  • the medium heat storage system exchanges heat into high-temperature steam to drive the photothermal steam turbine to drive photothermal power generation.
  • Machine power generation, intelligent micro-grid power control system monitors the change of load power in the micro-grid in real time and adjusts the output of the photo-thermal system to maintain the balance of the power load of the smart micro-grid.
  • the intelligent microgrid power control system collects the power values of the wind-solar hybrid power generation system, the micro-grid load and the photo-thermal generator set in real time, and receives the planned power generation command issued by the micro-grid dispatching automation system.
  • the microgrid required by the main grid is stable with a grid-connected power of 20 MW, and the allowable power fluctuation range is ⁇ 3%, that is, ⁇ 0.6 MW.
  • the power generation of the wind-solar hybrid power generation system is 15MW
  • the power generation capacity of the photothermal generator set is 5MW
  • the total power of the microgrid is 20MW.
  • step (8) When the weather conditions change and the power generation of the wind-solar complementary system suddenly fluctuates upward with a fluctuation rate of 1.5 MW/min, the power control system monitors the power of the wind-light system and then enters step (8); the maximum of the photothermal unit The climbing speed is 0.75MW/min. When the rate is exceeded, the photothermal generator can only be adjusted, and the process proceeds to step (9);
  • the intelligent microgrid power control system calculates the amount of change of power according to the difference between the planned power and the current power. After adjusting by the PI controller shown in Fig. 2, the output of the photothermal generator is increased by issuing a control command. To stabilize the output power of the microgrid.
  • the maximum climbing speed of the photothermal unit is 0.75 MW/min, which means that the grid-connected power of the micro-grid can be maintained at 20 MW.
  • Intelligent microgrid power control system calculates the power generation of the photothermal generator set, and controls the photothermal generator set to reduce the output through the PI controller; when the photothermal generator set needs to reduce the generated power beyond the photothermal generator set
  • the electric heat transfer switch is input to store the generated power of the redundant wind-solar hybrid power generation system in the medium heat storage system, and the grid-connected power of the micro-grid is maintained at 20MW. Since the heater can quickly consume excess power, as long as the heat storage tank can still store power, it will not cause wind and light to be discarded.

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

一种含介质储能的智能微电网发电功率控制系统及控制方法Intelligent microgrid power generation control system and control method thereof with medium energy storage 技术领域Technical field
本申请属于分布式发电与微电网技术领域，特别涉及一种风电、光伏、光热和大容量介质储热的智能微电网控制系统及控制方法。The present application belongs to the field of distributed generation and microgrid technology, and particularly relates to a smart microgrid control system and a control method for wind power, photovoltaic, photothermal and large-capacity medium heat storage.
背景技术Background technique
以风电、光伏发电为代表的新能源近年来取得了巨大的发展。但受天气条件多变的影响，其发电功率波动较大，特别体现在大规模集中式新能源发电场的直接并网会对电网产生较大的冲击。因此，国内很多地区出现“弃风”、“弃光”现象。为解决这一现象，我国正大力发展以分布式电源为核心的微电网系统，实现风电、光伏发电的就地消纳。微电网是由分布式电源、储能和负荷组成的小型低压配电系统，作为分布式电源的有效载体，既可实现微电网内部电量的自平衡，又可与主电网相连并双向传输功率。New energy, represented by wind power and photovoltaic power generation, has made tremendous progress in recent years. However, due to the changing weather conditions, its power generation power fluctuates greatly, especially in the direct grid connection of large-scale centralized new energy power plants, which will have a greater impact on the power grid. Therefore, in many areas of China, the phenomenon of “abandoning the wind” and “abandoning the light” has appeared. In order to solve this phenomenon, China is vigorously developing a microgrid system with distributed power as the core to achieve local consumption of wind power and photovoltaic power generation. The microgrid is a small low-voltage power distribution system consisting of distributed power, energy storage and load. As an effective carrier of distributed power, it can realize the self-balancing of the internal power of the micro-grid, and can be connected to the main power grid and transmit power in both directions.
为了平抑微电网中新能源发电功率的波动，可以分别对分布式电源、微网负荷、储能系统进行协调控制，以维持微电网功率的平衡。而在实际应用中对分布式电源及微网负荷的控制，必然会导致弃风、弃光以及微网甩负荷等现象的出现。而通过控制储能系统平抑功率波动的方法，可以有效解决上述问题。当前常见的微网储能方式主要是化学储能和机械储能。其中化学储能，如蓄电池储能、超级电容储能等模方法，可控制好，但总储能量有限、成本高；机械式储能，如飞轮储能、抽水蓄能等方法，虽储能容量大，但能量转换效率低且受地理条件、技术等因素的限制。介质储能单元的应用，特别是含有介质储热单元的光热发电机组的逐步成熟，成为近年来微电网储能利用的新方向，其优势在于储热装置能够大量存储热能且有良好的可调度性，其中汽轮机组具有良好的可控性，而且其热电转换部分与常规火力发电机组相同，有相对成熟的技术加以利用，是可再生能源发电中最具发展前景的发电形式之一。若将其与风电、光伏等分布式电源配合应用，可有效解决风力、太阳能发电功率波动较大的问题，构成的新型微电网具有控制灵活、输出稳定、发电成本低、能源利用率高等优点。In order to stabilize the fluctuation of new energy generation power in the microgrid, distributed power, microgrid load and energy storage system can be coordinated and controlled to maintain the balance of microgrid power. In practical applications, the control of distributed power and microgrid load will inevitably lead to the phenomenon of wind abandonment, light abandonment and microgrid load shedding. By controlling the energy storage system to suppress power fluctuations, the above problems can be effectively solved. The current common microgrid energy storage methods are mainly chemical energy storage and mechanical energy storage. Among them, chemical energy storage, such as battery energy storage, supercapacitor energy storage and other mode methods, can be controlled, but the total storage energy is limited, the cost is high; mechanical energy storage, such as flywheel energy storage, pumped storage, etc., although energy storage Large capacity, but low energy conversion efficiency and limited by geographical conditions, technology and other factors. The application of the medium energy storage unit, especially the gradual maturity of the photothermal generator set containing the medium heat storage unit, has become a new direction of energy storage and utilization of the microgrid in recent years. The advantage is that the heat storage device can store a large amount of heat energy and has good performance. Dispatching, in which the steam turbine unit has good controllability, and its thermoelectric conversion part is the same as the conventional thermal power generating unit, and has relatively mature technology to utilize it. It is one of the most promising forms of power generation in renewable energy power generation. If it is combined with wind power, photovoltaic and other distributed power sources, it can effectively solve the problem of large fluctuations in wind power and solar power generation. The new microgrid has the advantages of flexible control, stable output, low power generation cost and high energy utilization.
发明内容Summary of the invention
本申请的目的是提供一种利用含介质储能的光热发电机组平抑微电网发电 功率波动的控制系统及控制方法。The purpose of the application is to provide a photothermal generator set containing medium energy storage to stabilize the microgrid Power fluctuation control system and control method.
为解决所述技术问题，本申请具体采用以下技术方案：To solve the technical problem, the present application specifically adopts the following technical solutions:
一种含介质储能的智能微电网发电功率控制系统，所述智能微电网通过主电网开关与配电网相连，通过负荷并网开关与微网负荷相连，其特征在于：A smart microgrid power generation control system with medium energy storage, the smart microgrid is connected to a distribution network through a main power grid switch, and is connected to a microgrid load through a load grid connection switch, and is characterized by:
所述智能微电网包括风光互补发电系统、光热发电机组、介质储热系统、功率控制系统；The smart microgrid includes a wind and solar hybrid power generation system, a photothermal generator set, a medium heat storage system, and a power control system;
所述风光互补发电系统通过风光互补发电系统并网开关连接至智能微电网输出母线，通过电转热开关连接至介质储热系统；The wind-solar hybrid power generation system is connected to the smart micro-grid output bus through the grid-connected switch of the wind-solar hybrid power generation system, and is connected to the medium heat storage system through the electric heat switch;
所述光热发电机组中包括光热汽轮机和光热发电机，光热汽轮机带动光热发电机发电，所述介质储热系统以及光热镜场均连接至光热汽轮机的输入端，所述光热发电机通过光热发电机组并网开关连接至智能微电网输出母线；The photothermal generator set includes a photothermal steam turbine and a photothermal generator, and the photothermal steam turbine drives the photothermal generator to generate electricity, and the medium heat storage system and the photothermal mirror field are both connected to the input end of the photothermal steam turbine, The photothermal generator is connected to the smart microgrid output bus through the grid switch of the photothermal generator set;
所述功率控制系统实时监测风光互补发电系统、微网负荷及光热发电机组的功率值，接收微电网调度自动化系统下发的功率指令，优化分配风光互补发电系统、光热发电机组的发电量以及介质储热系统的储热量。The power control system monitors the power values of the wind-solar hybrid power generation system, the micro-grid load and the photo-thermal generator set in real time, receives the power command issued by the micro-grid dispatching automation system, and optimizes the distribution of the wind-solar hybrid power generation system and the photo-thermal generator set. And the heat storage of the medium heat storage system.
本发明还进一步优选包括以下方案：The present invention still further preferably includes the following scheme:
风光互补发电系统包括多个风电机组和光伏机组，风电机组和光伏机组的输出端汇接到风光互补发电系统母线后通过升压变压器连接到电转热开关和风光互补发电系统并网开关。The wind-solar hybrid power generation system includes a plurality of wind turbines and photovoltaic units. The output ends of the wind turbines and the photovoltaic units are connected to the busbar of the wind-solar hybrid power generation system and then connected to the electric-to-heat switch and the wind-solar hybrid power generation system through the step-up transformer.
所述功率控制系统首先确保风光互补发电系统优先发电，通过调节光热发电机组出力及介质储热系统的储热、放热速度，稳定微电网的发电功率。The power control system first ensures that the wind-solar hybrid power generation system preferentially generates power, and stabilizes the power generation of the micro-grid by adjusting the output of the photothermal generator set and the heat storage and heat release rate of the medium heat storage system.
本申请还公开了一种含介质储能的智能微电网发电功率控制方法，其特征在于：The invention also discloses a smart microgrid power generation control method comprising medium energy storage, characterized in that:
智能微电网功率控制系统实时接收微电网调度自动化系统下发的功率指令，并实时采集风光互补发电系统、光热发电机组的发电功率，检测介质储热系统的储热量，对介质储热系统的储热、放热速度及光热发电系统、风光互补发电系统的发电功率进行协调控制，实现微电网发电功率的稳定输出。The intelligent microgrid power control system receives the power command issued by the microgrid dispatching automation system in real time, and collects the power generation of the wind-solar hybrid power generation system and the photothermal generator set in real time, and detects the heat storage capacity of the medium heat storage system, and the heat storage system of the medium heat storage system The heat storage, heat release rate, and the power generation of the CSP system and the wind-solar hybrid power generation system are coordinated to achieve stable output of the microgrid power generation.
含介质储能的智能微电网发电功率控制方法包括以下步骤：The intelligent microgrid power generation control method with medium energy storage includes the following steps:
(1)智能微电网功率控制系统智能微电网主并网开关的运行状态，当主并网开关断开时，所述智能微电网进入孤网运行模式，进入步骤(2)；当主并网开关投入时，所述智能微电网进入并网运行模式，进入步骤(5)；(1) Intelligent micro-grid power control system The operating state of the main grid-connected switch of the intelligent micro-grid. When the main grid-connected switch is disconnected, the smart micro-grid enters the isolated mode and enters step (2); when the main grid-connected switch is put into operation At the time, the smart micro-grid enters the grid-connected operation mode, and proceeds to step (5);
(2)断开风光互补发电系统的并网开关； (2) Disconnecting the grid-connected switch of the wind-solar hybrid power generation system;
(3)检测介质储热系统的储热量，若储热量未超过事先设定好的限值则投入电转热开关，将风光互补发电系统的发电功率储存于介质储热系统中，然后进入步骤(4)；若储热量超过事先设定好的限值则断开电转热开关，风光互补发电系统停运，然后进入步骤(4)；(3) Detecting the heat storage capacity of the medium heat storage system, if the heat storage capacity does not exceed the preset limit value, input the electric heat switch, store the power generated by the wind-solar hybrid power generation system in the medium heat storage system, and then enter the step ( 4); if the stored heat exceeds the preset limit, the electric heat switch is turned off, the wind-solar hybrid power generation system is stopped, and then proceeds to step (4);
(4)所述介质储热系统将介质中的热量交换到高温蒸汽中，推动光热汽轮机带动光热发电机发电，所述智能微电网功率控制系统实时监测微网负荷功率的变化并调节光热系统的出力，维持智能微电网的用电功率平衡；(4) The medium heat storage system exchanges heat in the medium into the high temperature steam to drive the photothermal steam turbine to drive the photothermal generator to generate electricity, and the intelligent micro grid power control system monitors the change of the microgrid load power and adjusts the light in real time. The output of the thermal system maintains the power balance of the smart microgrid;
(5)投入风光互补发电系统的并网开关；(5) Grid-connected switches that are input into the wind-solar hybrid power generation system;
(6)智能微电网功率控制系统实时采集风光互补发电系统、微网负荷及光热发电机组的功率值，接收微电网调度自动化系统下发的计划发电功率指令；(6) The intelligent microgrid power control system collects the power values of the wind-solar hybrid power generation system, the micro-grid load and the photo-thermal generator set in real time, and receives the planned power generation command issued by the micro-grid dispatching automation system;
(7)当电网调度自动化系统下发的计划发电功率大于风光互补发电系统的实时发电功率时，进入步骤(8)，否则进入步骤(9)；(7) When the planned power generation power delivered by the power grid dispatching automation system is greater than the real-time power generation power of the wind and solar hybrid power generation system, proceed to step (8), otherwise proceed to step (9);
(8)智能微电网功率控制系统计算光热发电机组需要增加的发电功率，并通过PI控制器控制光热发电机组增加出力维持智能微电网并网功率与所述计划发电功率的平衡；(8) The intelligent microgrid power control system calculates the required power generation of the photothermal generator set, and controls the photothermal generator set to increase the output by the PI controller to maintain the balance between the smart microgrid grid-connected power and the planned power generation;
(9)智能微电网功率控制系统计算光热发电机组需要减少的发电功率，并通过PI控制器控制光热发电机组减少出力；当光热发电机组需要减少的发电功率超出了光热发电机组的调节能力时，投入电转热开关将多余的风光互补发电系统的发电功率储存于介质储热系统中。(9) Intelligent microgrid power control system calculates the power generation of the photothermal generator set, and controls the photothermal generator set to reduce the output through the PI controller; when the photothermal generator set needs to reduce the generated power beyond the photothermal generator set When adjusting the capacity, the electric heat switch is input to store the generated power of the redundant wind-solar hybrid power generation system in the medium heat storage system.
本申请具有以下有益的技术效果：该微电网功率控制方法适用于微电网的并网运行和孤网运行两种模式，可满足实时的电网调度要求和微网负荷需求，有效的抑制微电网的功率波动且兼顾了供电可靠性，有效的解决分布式新能源并网中出现是“弃风”、“弃光”现象，能够保障微电网的长时安全稳定运行，延长设备的使用寿命。The application has the following beneficial technical effects: the micro grid power control method is applicable to the grid-connected operation and the isolated network operation mode of the micro grid, and can meet the real-time grid dispatching requirements and the microgrid load demand, and effectively suppress the micro grid. The power fluctuations take into account the reliability of the power supply, and effectively solve the phenomenon of “discarding the wind” and “abandoning the light” in the network of distributed new energy, which can guarantee the long-term safe and stable operation of the micro-grid and prolong the service life of the equipment.
附图说明DRAWINGS
图1是本申请含介质储能的智能微电网发电功率控制系统构架图；1 is a structural diagram of a smart microgrid power generation control system with medium energy storage according to the present application;
图2是微电网发电功率PI控制器；Figure 2 is a microgrid power PI controller;
图3是本申请含介质储能的智能微电网发电功率控制方法流程图。3 is a flow chart of a method for controlling power generation of a smart microgrid containing medium energy storage according to the present application.
具体实施方式：detailed description:
下面通过实施例并结合说明书附图对本发明的技术方案作进一步详细说明。 The technical solution of the present invention will be further described in detail below by way of embodiments and with reference to the accompanying drawings.
本申请以图1所示的风电、光伏、光热联合稳定发电的微电网系统作为实施例。然而，本实施例可以体现为多种不同形式，并不应理解为局限在这里诉述的示例性实施例。而是，提供这些实施例，从而使本发明更全面地传达给本领域的技术人员。The present application takes the wind power, photovoltaic, photothermal and stable power generation microgrid system shown in FIG. 1 as an embodiment. However, the present embodiments may be embodied in many different forms and should not be construed as being limited to the exemplary embodiments described herein. Rather, these embodiments are provided so that this disclosure will be more fully disclosed to those skilled in the art.
实施例中的微电网系统，其一次拓扑结构是：The micro-grid system in the embodiment has a primary topology:
风光互补发电系统通过一台共用的升压变压器及断路器连接至10kV微电网的输出母线；光热镜场将接受到的光能转化成高温蒸汽输送给光热汽轮机与介质储能系统，带介质储能的光热发电机组的机端经过一台断路器接至10kV微电网的输出母线；微电网的输出母线通过并网断路器与35kV主电网相连，通过负荷断路器与微电网的用电负荷相连；微电网输出母线与电转热设备经过电转热变压器及电转热开关相互联接，将风光互补发电系统过剩的不能并网的电能转化为热能存储起来。The wind-solar hybrid power generation system is connected to the output bus of the 10kV microgrid through a common step-up transformer and circuit breaker; the photothermal mirror converts the received light energy into high-temperature steam for the photothermal steam turbine and the medium energy storage system. The end of the photothermal generator set of the medium energy storage is connected to the output bus of the 10kV microgrid through a circuit breaker; the output bus of the microgrid is connected to the 35kV main grid through the grid-connected circuit breaker, and the load circuit breaker and the microgrid are used. The electrical load is connected; the micro-grid output bus and the electric heating device are connected to each other through an electric-to-heat transformer and an electric-to-heat switch, and the excess electric power that cannot be connected to the wind-solar hybrid power generation system is converted into heat energy for storage.
实施例中风光互补发电系统额定发电容量为15MW；光热镜场的热功率容量为30MW；光热发电机额定容量为15MW，增减出力的速度最快为每分钟调节机组额定容量的5％，即每分钟最大调节0.75MW功率；介质储热系统共分3个储热罐，每个储热罐的储热容量设计为240MWh，总储热量可供光热发电机满功率发电运行48小时；电转热系统中的加热器接近于纯阻性负载，响应速度快，可以快速消耗电功率。每个储热罐内加热器的加热功率为5MW，加热最小功率调节档位为1MW，储热系统最大同时加热功率为15MW，每个储热罐的储热容量达到240MWh后断开电转热开关。In the embodiment, the rated power generation capacity of the wind-solar hybrid power generation system is 15MW; the thermal power capacity of the photothermal mirror field is 30MW; the rated capacity of the photothermal generator is 15MW, and the speed of increasing or decreasing the output is the fastest 5% of the rated capacity of the unit per minute. That is, the maximum regulation of 0.75MW per minute; the medium heat storage system is divided into three heat storage tanks, the heat storage capacity of each heat storage tank is designed to be 240MWh, and the total heat storage capacity can be used for 48 hours of full power generation of the photothermal generator; The heater in the electric heating system is close to the pure resistive load, and the response speed is fast, and the electric power can be quickly consumed. The heating power of the heater in each storage tank is 5MW, the minimum power adjustment gear is 1MW, and the maximum heating power of the heat storage system is 15MW. The heat storage capacity of each heat storage tank reaches 240MWh and then the electric heat switch is disconnected.
如附图3所示为本发明含介质储能的智能微电网发电功率控制方法流程图，所述智能微电网发电功率控制方法包括以下步骤：FIG. 3 is a flowchart of a method for controlling power generation of a smart microgrid containing medium energy storage according to the present invention. The smart power grid power generation control method includes the following steps:
(1)监测智能微电网主并网开关的运行状态，当主并网开关断开时，所述智能微电网进入孤网运行模式，进入步骤(2)；当主并网开关投入时，所述智能微电网进入并网运行模式，进入步骤(5)；(1) monitoring the running state of the main grid-connected switch of the smart micro-grid. When the main grid-connected switch is disconnected, the smart micro-grid enters the isolated network operation mode, and proceeds to step (2); when the main grid-connected switch is turned on, the intelligence The microgrid enters the grid-connected operation mode and proceeds to step (5);
(2)断开风光互补发电系统的并网开关；(2) Disconnecting the grid-connected switch of the wind-solar hybrid power generation system;
(3)检测介质储热系统的储热量，若储热量未超过每个储热罐240MWh的储热容量则投入电转热开关，将风光互补发电系统的发电功率储存于介质储热系统中，然后进入步骤(4)；若储热量超过每个储热罐240MWh的储热容量则断开电转热开关，风光互补发电系统停运，然后进入步骤(4)；(3) Detecting the heat storage capacity of the medium heat storage system. If the heat storage capacity does not exceed the heat storage capacity of 240MWh of each heat storage tank, the electric heat switch is input, and the power generated by the wind-solar hybrid power generation system is stored in the medium heat storage system, and then enters Step (4); if the stored heat exceeds the heat storage capacity of each storage tank 240MWh, the electric heat switch is disconnected, the wind and solar hybrid power generation system is stopped, and then proceeds to step (4);
(4)介质储热系统将热量交换到高温蒸汽中，推动光热汽轮机带动光热发电 机发电，智能微电网功率控制系统实时监测微电网内负荷功率的变化情况并调节光热系统的出力，维持智能微电网的用电负荷的平衡。(4) The medium heat storage system exchanges heat into high-temperature steam to drive the photothermal steam turbine to drive photothermal power generation. Machine power generation, intelligent micro-grid power control system monitors the change of load power in the micro-grid in real time and adjusts the output of the photo-thermal system to maintain the balance of the power load of the smart micro-grid.
(5)投入风光互补发电系统的并网开关；(5) Grid-connected switches that are input into the wind-solar hybrid power generation system;
(6)智能微电网功率控制系统实时采集风光互补发电系统、微网负荷及光热发电机组的功率值，接收微电网调度自动化系统下发的计划发电功率指令。假设主电网要求的微电网稳定并网电量为20MW，允许的功率波动范围是±3％，即±0.6MW。某一时刻风光互补发电系统的发电功率为15MW，光热发电机组的发电功率为5MW，则微电网并网总功率为20MW。当天气条件发生变化导致风光互补系统的发电功率以0.75MW/min波动率突然向下波动时，功率控制系统监测到风光系统功率增加后，进入步骤(8)；(6) The intelligent microgrid power control system collects the power values of the wind-solar hybrid power generation system, the micro-grid load and the photo-thermal generator set in real time, and receives the planned power generation command issued by the micro-grid dispatching automation system. Assume that the microgrid required by the main grid is stable with a grid-connected power of 20 MW, and the allowable power fluctuation range is ±3%, that is, ±0.6 MW. At a certain moment, the power generation of the wind-solar hybrid power generation system is 15MW, and the power generation capacity of the photothermal generator set is 5MW, and the total power of the microgrid is 20MW. When the weather conditions change and the power generation of the wind-solar complementary system suddenly fluctuates downward at a fluctuation rate of 0.75 MW/min, after the power control system detects that the power of the wind-light system increases, the process proceeds to step (8);
(7)当天气条件发生变化导致风光互补系统的发电功率以1.5MW/min的波动率突然向上波动时，功率控制系统监测到风光系统功率增加后，进入步骤(8)；光热机组的最大爬坡速度是0.75MW/min，当超过该速率后仅靠光热发电机已无法调节，进入步骤(9)；(7) When the weather conditions change and the power generation of the wind-solar complementary system suddenly fluctuates upward with a fluctuation rate of 1.5 MW/min, the power control system monitors the power of the wind-light system and then enters step (8); the maximum of the photothermal unit The climbing speed is 0.75MW/min. When the rate is exceeded, the photothermal generator can only be adjusted, and the process proceeds to step (9);
(8)智能微电网功率控制系统根据计划功率与当前功率之差计算出功率的变化量，经过图2所示PI控制器调节后，通过下达控制指令，时时增大光热发电机的出力，以稳定微电网的输出功率。光热机组的最大爬坡速度是0.75MW/min，即此时可以维持微电网并网功率在20MW。(8) The intelligent microgrid power control system calculates the amount of change of power according to the difference between the planned power and the current power. After adjusting by the PI controller shown in Fig. 2, the output of the photothermal generator is increased by issuing a control command. To stabilize the output power of the microgrid. The maximum climbing speed of the photothermal unit is 0.75 MW/min, which means that the grid-connected power of the micro-grid can be maintained at 20 MW.
(9)智能微电网功率控制系统计算光热发电机组需要减少的发电功率，并通过PI控制器控制光热发电机组减少出力；当光热发电机组需要减少的发电功率超出了光热发电机组的调节能力0.75MW/min时，投入电转热开关将多余的风光互补发电系统的发电功率储存于介质储热系统中，维持微电网并网功率在20MW。由于加热器可快速消耗过剩的电能，只要储热罐仍可存储功率，就不会导致弃风、弃光现象的发生。(9) Intelligent microgrid power control system calculates the power generation of the photothermal generator set, and controls the photothermal generator set to reduce the output through the PI controller; when the photothermal generator set needs to reduce the generated power beyond the photothermal generator set When the adjustment capacity is 0.75MW/min, the electric heat transfer switch is input to store the generated power of the redundant wind-solar hybrid power generation system in the medium heat storage system, and the grid-connected power of the micro-grid is maintained at 20MW. Since the heater can quickly consume excess power, as long as the heat storage tank can still store power, it will not cause wind and light to be discarded.
申请人结合说明书附图对本发明的实施例做了详细的说明与描述，但是本领域技术人员应该理解，以上实施例仅为本发明的优选实施方案，详尽的说明只是为了帮助读者更好地理解本发明精神，而并非对本发明保护范围的限制，相反，任何基于本发明的发明精神所作的任何改进或修饰都应当落在本发明的保护范围之内。 The embodiments of the present invention have been described and illustrated in detail with reference to the accompanying drawings, but those skilled in the art should understand that the above embodiments are only preferred embodiments of the present invention, and the detailed description is only to help the reader understand better. The present invention is not intended to limit the scope of the present invention. Instead, any modifications or variations made by the spirit of the present invention should fall within the scope of the present invention.

Claims (4)

  1. 一种含介质储能的智能微电网发电功率控制系统，所述智能微电网通过主电网开关与配电网相连，通过负荷并网开关与微网负荷相连，其特征在于：A smart microgrid power generation control system with medium energy storage, the smart microgrid is connected to a distribution network through a main power grid switch, and is connected to a microgrid load through a load grid connection switch, and is characterized by:
    所述智能微电网包括风光互补发电系统、光热发电机组、介质储热系统、功率控制系统；The smart microgrid includes a wind and solar hybrid power generation system, a photothermal generator set, a medium heat storage system, and a power control system;
    所述光热互补发电系统通过风光互补发电系统并网开关连接至智能微电网输出母线，通过电转热开关连接至介质储热系统；The photothermal complementary power generation system is connected to the smart microgrid output bus through the grid-connected switch of the wind-solar hybrid power generation system, and is connected to the medium heat storage system through the electric heat switch;
    所述光热发电机组中包括光热汽轮机和光热发电机，光热汽轮机带动光热发电机发电，所述介质储热系统及光热镜场均连接至光热汽轮机的输入端，所述光热发电机通过光热机组并网开关连接至智能微电网输出母线；The photothermal generator set includes a photothermal steam turbine and a photothermal generator, and the photothermal steam turbine drives the photothermal generator to generate electricity, and the medium heat storage system and the photothermal mirror field are both connected to the input end of the photothermal steam turbine, The photothermal generator is connected to the smart microgrid output bus through the photothermal unit grid-connected switch;
    所述功率控制系统实时监测风光互补发电系统、微网负荷及光热发电机组的功率值，接收微电网调度自动化系统下发的功率指令，优化分配风光互补发电系统、光热发电机组的发电量以及介质储热系统的储热量。The power control system monitors the power values of the wind-solar hybrid power generation system, the micro-grid load and the photo-thermal generator set in real time, receives the power command issued by the micro-grid dispatching automation system, and optimizes the distribution of the wind-solar hybrid power generation system and the photo-thermal generator set. And the heat storage of the medium heat storage system.
  2. 根据权利要求1所述的智能微电网发电功率控制系统，其特征在于：The intelligent microgrid power generation control system according to claim 1, wherein:
    风光互补发电系统包括多个风电机组和光伏机组，风电机组和光伏机组的输出端汇接到风光互补发电系统母线后通过升压变压器连接到电转热开关和风光互补发电系统并网开关。The wind-solar hybrid power generation system includes a plurality of wind turbines and photovoltaic units. The output ends of the wind turbines and the photovoltaic units are connected to the busbar of the wind-solar hybrid power generation system and then connected to the electric-to-heat switch and the wind-solar hybrid power generation system through the step-up transformer.
    所述功率控制系统首先确保风光互补发电系统优先发电，通过调节光热发电机组出力及介质储热系统的储热、放热速度，稳定微电网的发电功率。The power control system first ensures that the wind-solar hybrid power generation system preferentially generates power, and stabilizes the power generation of the micro-grid by adjusting the output of the photothermal generator set and the heat storage and heat release rate of the medium heat storage system.
  3. 一种含介质储能的智能微电网发电功率控制方法，其特征在于：A smart microgrid power generation control method comprising medium energy storage, characterized in that:
    智能微电网功率控制系统实时接收微电网调度自动化系统下发的功率指令，并实时采集风光互补发电系统、光热发电机组的发电功率，检测介质储热系统的储热量，对介质储热系统的储热、放热速度及光热发电机组、风光互补发电系统的发电功率进行协调控制，实现微电网发电功率的稳定输出。The intelligent microgrid power control system receives the power command issued by the microgrid dispatching automation system in real time, and collects the power generation of the wind-solar hybrid power generation system and the photothermal generator set in real time, and detects the heat storage capacity of the medium heat storage system, and the heat storage system of the medium heat storage system The heat storage, heat release rate, and the power generation of the photothermal generator set and the wind-solar hybrid power generation system are coordinated to achieve stable output of the microgrid power generation.
  4. 根据权利要求3所述的智能微电网发电功率控制方法，其特征在于：所述控制方法包括以下步骤：The intelligent microgrid power generation control method according to claim 3, wherein the control method comprises the following steps:
    (1)智能微电网功率控制系统智能微电网主并网开关的运行状态，当主并网开关断开时，所述智能微电网进入孤网运行模式，进入步骤(2)；当主并网开关投入时，所述智能微电网进入并网运行模式，进入步骤(5)；(1) Intelligent micro-grid power control system The operating state of the main grid-connected switch of the intelligent micro-grid. When the main grid-connected switch is disconnected, the smart micro-grid enters the isolated mode and enters step (2); when the main grid-connected switch is put into operation At the time, the smart micro-grid enters the grid-connected operation mode, and proceeds to step (5);
    (2)断开风光互补发电系统的并网开关；(2) Disconnecting the grid-connected switch of the wind-solar hybrid power generation system;
    (3)检测介质储热系统的储热量，若储热量未超过事先设定好的限值则投入电转热 开关，将风光互补发电系统的发电功率储存于介质储热系统中，然后进入步骤(4)；若储热量超过事先设定好的限值则断开电转热开关，风光互补发电系统停运，然后进入步骤(4)；(3) Detecting the heat storage of the medium heat storage system, if the heat storage does not exceed the preset limit, then input the heat transfer The switch stores the generated power of the wind-solar hybrid power generation system in the medium heat storage system, and then proceeds to step (4); if the stored heat exceeds the preset limit, the electric heat switch is turned off, and the wind-solar hybrid power generation system is stopped. Then proceed to step (4);
    (4)所述介质储热系统将介质中的热量交换到高温蒸汽中，推动光热汽轮机带动光热发电机发电，所述智能微电网功率控制系统实时监测微网负荷功率的变化并调节光热系统的出力，维持智能微电网的用电功率平衡；(4) The medium heat storage system exchanges heat in the medium into the high temperature steam to drive the photothermal steam turbine to drive the photothermal generator to generate electricity, and the intelligent micro grid power control system monitors the change of the microgrid load power and adjusts the light in real time. The output of the thermal system maintains the power balance of the smart microgrid;
    (5)投入风光互补发电系统的并网开关；(5) Grid-connected switches that are input into the wind-solar hybrid power generation system;
    (6)智能微电网功率控制系统实时采集风光互补发电系统、微网负荷及光热发电机组的功率值，接收微电网调度自动化系统下发的计划发电功率指令；(6) The intelligent microgrid power control system collects the power values of the wind-solar hybrid power generation system, the micro-grid load and the photo-thermal generator set in real time, and receives the planned power generation command issued by the micro-grid dispatching automation system;
    (7)当电网调度自动化系统下发的计划发电功率大于风光互补发电系统的实时发电功率时，进入步骤(8)，否则进入步骤(9)；(7) When the planned power generation power delivered by the power grid dispatching automation system is greater than the real-time power generation power of the wind and solar hybrid power generation system, proceed to step (8), otherwise proceed to step (9);
    (8)智能微电网功率控制系统计算光热发电机组需要增加的发电功率，并通过PI控制器控制光热发电机组增加出力维持智能微电网并网功率与所述计划发电功率的平衡；(8) The intelligent microgrid power control system calculates the required power generation of the photothermal generator set, and controls the photothermal generator set to increase the output by the PI controller to maintain the balance between the smart microgrid grid-connected power and the planned power generation;
    (9)智能微电网功率控制系统计算光热发电机组需要减少的发电功率，并通过PI控制器控制光热发电机组减少出力；当光热发电机组需要减少的发电功率超出了光热发电机组的调节能力时，投入电转热开关，将多余的风光互补发电系统的发电功率储存于介质储热系统中。 (9) Intelligent microgrid power control system calculates the power generation of the photothermal generator set, and controls the photothermal generator set to reduce the output through the PI controller; when the photothermal generator set needs to reduce the generated power beyond the photothermal generator set When adjusting the capacity, an electric heat transfer switch is input to store the generated power of the redundant wind-solar hybrid power generation system in the medium heat storage system.
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