WO2017107246A1 - Système et procédé de régulation de la puissance produite d'un micro-réseau intelligent à stockage d'énergie de moyenne capacité - Google Patents

Système et procédé de régulation de la puissance produite d'un micro-réseau intelligent à stockage d'énergie de moyenne capacité 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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English (en)
Chinese (zh)
Inventor
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/fr

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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.

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  • 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

L'invention concerne un système et un procédé de régulation de la puissance produite d'un micro-réseau intelligent à stockage d'énergie de moyenne capacité. Le système de régulation comprend principalement un système de production d'énergie hybride éolien-solaire, un ensemble de production d'énergie solaire thermique à stockage d'énergie de moyenne capacité, et un système de régulation de puissance de micro-réseau. Le procédé de régulation comprend les étapes suivantes : un centre de commande centralisé de micro-réseau reçoit en temps réel une instruction de puissance envoyée par un système d'automatisation de répartition de micro-réseau, et collecte en temps réel la puissance produite du système de production d'énergie hybride éolien-solaire; et un système de gestion d'énergie calcule un programme de distribution de puissance optimal d'un micro-réseau. Selon le programme de distribution de puissance, une sortie stable de la puissance produite du micro-réseau est mise en œuvre par réalisation d'une commande coordonnée sur des taux de stockage de chaleur et de libération de chaleur d'un système de stockage de chaleur, et la puissance produite de l'ensemble de production d'énergie solaire thermique. Au moyen du procédé de commande, les défauts techniques, tels que l'incontrôlabilité, la discontinuité et les fortes fluctuations d'énergie éolienne et d'énergie solaire produite qui sont provoquées par les changements de l'environnement extérieur, peuvent être surmontés, la puissance produite du micro-réseau est stabilisée, l'énergie électrique provenant d'énergies renouvelables peut être consommée dans la plus grande mesure, et les problèmes de pertes éoliennes et solaires dues aux réductions de capacité (« restriction de vent » et « restriction de lumière ») dans les énergies renouvelables peuvent être efficacement résolus.
PCT/CN2016/000317 2015-12-25 2016-06-17 Système et procédé de régulation de la puissance produite d'un micro-réseau intelligent à stockage d'énergie de moyenne capacité WO2017107246A1 (fr)

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GB1719021.6A GB2561273B (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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CN201510993996.5 2015-12-25
CN201510993996.5A CN105470982B (zh) 2015-12-25 2015-12-25 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

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