Micro-grid energy management system based on active disturbance rejection control

Abstract

The invention relates to the technical field of new energy photovoltaic power generation, hydroelectric power generation and micro-grid comprehensive utilization, in particular to a micro-grid energy management system based on active disturbance rejection control. Comprising a control module, a micro-grid active-disturbance-rejection control system, a hydroelectric generating set active-disturbance-rejection control system, a water pump system control module, a photovoltaic power generation system control module and an energy storage unit control module. The control module is used for obtaining voltage and current state information of the water pump control subsystem, the hydroelectric generating set control subsystem, the energy storage unit control subsystem and the photovoltaic power generation control subsystem through the micro-grid control platform. According to the micro-grid energy management system based on active-disturbance-rejection control provided by the invention, the system is arranged nearby, the power distribution network is effectively supplemented, and the voltage output of the micro-grid is effectively controlled to stabilize the voltage of the power distribution network by using the strong adaptability of the active-disturbance-rejection control to interference; the technical problems that in the prior art, photovoltaic power generation is low in electric energy use efficiency and cannot be effectively supplemented to a power grid are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy photovoltaic power generation, hydropower generation and microgrid comprehensive utilization, and in particular to a microgrid energy management system based on active anti-disturbance control. Background Art

[0002] The capacity of photovoltaic power generation is also increasing. The characteristics of photovoltaic power generation make it difficult to connect its power to the large power grid. Many domestic units and individuals are studying how to use photovoltaic new energy efficiently and stably.

[0003] The following methods are proposed in the prior art:

[0004] 1. Hydropower, wind, solar power and biomass multi-energy integrated complementary power generation method and device (application number: 201110201589.8). The application of this patent focuses on: taking hydropower as the main body, making full use of the unique valley wind of the hydropower station, utilizing solar energy, biomass energy and other relatively concentrated renewable energy sources on site, gathering them around the hydropower station, and forming a multi-energy integrated complementary power generation system with hydropower as the center, including hydropower, wind, solar power and biomass.

[0005] 2. A complementary control method for wind, solar, water and gas power generation in a regional power grid of a small hydropower cluster (201510291179.5). The core of this patent is to balance the power of the grid-connected wind power by adjusting the active power output of the small hydropower cluster.

[0006] 3. A hybrid wind-solar hybrid pumped storage system and its control method (201110300964.4). The core of this patent is: the traditional wind-solar hybrid system energy storage device - the battery pack is replaced by a pumped storage power generation system, and a reversible pump turbine is used in the pumped storage unit to pump water or generate electricity, and the piecewise integration method is used to monitor and control the energy of the upper water tank of the pumped storage unit.

[0007] However, the above systems are basically located in remote areas, far away from load centers. When the grid capacity is limited, the utilization efficiency of the system is relatively low and it is unable to effectively supplement the grid.

[0008] To this end, a microgrid energy management system based on active disturbance rejection control is designed to provide another technical solution to the above technical problems. Summary of the invention

[0009] Based on this, it is necessary to provide a microgrid energy management system based on active disturbance rejection control to solve the technical problems raised in the above background technology.

[0010] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0011] A microgrid energy management system based on active disturbance rejection control, comprising a control module, a microgrid active disturbance rejection control system, a hydropower unit active disturbance rejection control system, a water pump system control module, a photovoltaic power generation system control module, and an energy storage unit control module;

[0012] The control module is used to obtain the voltage and current status information of the water pump control subsystem, the hydropower unit control subsystem, the energy storage unit control subsystem, and the photovoltaic power generation control subsystem through the microgrid control platform, obtain the voltage and current status information of the mains through the information detection device, and perform control calculations through the microgrid active disturbance rejection control system;

[0013] The water pump control subsystem receives the flow Q instruction from the microgrid control platform and controls it through the water pump system control module. The hydropower unit control subsystem receives the power, frequency and voltage input instructions from the microgrid control platform, and outputs stable electric energy to the city power through the hydropower unit self-disturbance rejection control system. The photovoltaic power generation control subsystem operates through the photovoltaic power generation system control module. The energy storage unit control subsystem receives the charge and discharge curve L input instruction from the microgrid control platform and performs operation control through the energy storage unit control module.

[0014] As a preferred implementation of the microgrid energy management system based on active disturbance rejection control provided by the present invention, the microgrid active disturbance rejection control system is composed of a microgrid control platform output tracking differentiator, a nonlinear combination, a photovoltaic-small hydropower-energy storage microgrid and a microgrid control platform input tracking differentiator. The power, frequency and voltage command information obtained by the microgrid control platform is output through the microgrid control platform input tracking differentiator to output a set of state information V1…V n The microgrid control platform obtains a set of feedback information Z1…Z through the microgrid control platform output tracking differentiator n ;

[0015] By V i -Z i The value of is obtained by using nonlinear combination to obtain the system control command u0(t), and the control command output gain b0 is output through the microgrid control platform to track the differentiator to obtain the feedback output information Z n+1 ;

[0016] Will The control command is input into the photovoltaic-small hydropower-energy storage microgrid to obtain the system output command power p, frequency f, voltage v, flow rate Q and charging and discharging curve L.

[0017] As a preferred implementation of the microgrid energy management system based on active disturbance rejection control provided by the present invention, the hydropower unit active disturbance rejection control system is composed of a hydropower unit output tracking differentiator, a nonlinear combination, a hydropower unit and a hydropower unit input tracking differentiator. The power, frequency and voltage command information obtained by the microgrid control platform is output through the hydropower unit input tracking differentiator to output a set of state information V1…V n The output of the hydropower unit control subsystem is obtained through the output tracking differentiator of the hydropower unit to obtain a set of feedback information Z1…Z n ;

[0018] By V i -Z i The value of is used to obtain the system control command u0(t) by nonlinear combination, and the control command output gain b0 is passed through the output tracking differentiator of the hydropower unit to obtain the feedback output information Z n+1 ;

[0019] Will The control instructions are input to the hydropower unit to output power p, frequency f and voltage v to the mains.

[0020] As a preferred implementation of the microgrid energy management system based on active anti-disturbance control provided by the present invention, the water pump system control module is composed of a microgrid control platform, a PID control algorithm unit, a water pump and an information processing unit. The information processing unit receives the flow Q instruction output by the microgrid control platform, controls the water pump through the PID control algorithm unit, and sends voltage and current status information to the microgrid control platform.

[0021] As a preferred implementation of the microgrid energy management system based on active anti-disturbance control provided by the present invention, the photovoltaic power generation system control module is composed of a microgrid control platform, a water pump, a photovoltaic power generation system and an MPPT control unit. The photovoltaic power generation system performs maximum power generation control through the MPPT control unit, and the generated electric energy is directly output to the water pump, and the voltage and current status information of the generated electricity is output to the microgrid control platform.

[0022] As a preferred implementation of the microgrid energy management system based on active disturbance rejection control provided by the present invention, the energy storage unit control module is composed of a mains supply, a water pump, a charging optimal control unit, a discharging control unit, a charging controller, a DC-AC water pump connected to an inverter and an energy storage unit subsystem, and the energy storage unit subsystem receives a charge and discharge curve L input instruction from a microgrid control platform, and feeds back voltage and current state information;

[0023] The optimal charging control unit receives charging information for the energy storage unit subsystem and controls charging from the mains through a charging controller; the discharging control unit receives a discharging instruction curve L and outputs electrical energy to the water pump through a DC-AC water pump connected to an inverter.

[0024] As a preferred implementation of the microgrid energy management system based on active anti-disturbance control provided by the present invention, the microgrid control platform has information input with the water pump control subsystem, the hydropower unit control subsystem, the energy storage unit control subsystem, the photovoltaic power generation control subsystem and the information detection device, and the microgrid control platform has control information interaction with the hydropower unit active anti-disturbance control system, the water pump system control module and the energy storage unit control module.

[0025] It can be seen without a doubt that the above-mentioned technical solution of the present application can definitely solve the technical problem to be solved by the present application.

[0026] At the same time, through the above technical solutions, the present invention has at least the following beneficial effects:

[0027] 1. The present invention provides a microgrid energy management system based on active disturbance rejection control. By setting up the system nearby, the distribution network can be effectively supplemented. The strong adaptability of active disturbance rejection control to interference can be used to effectively control the voltage output of the microgrid to stabilize the voltage of the distribution network. The present invention can effectively alleviate the technical problems in the prior art that photovoltaic power generation is inefficient in using electricity and cannot effectively supplement the power grid.

[0028] 2. The present invention adopts an anti-disturbance control algorithm with strong anti-interference ability and no need for precise mathematical models. It regards the uncertainties in the system as interference, effectively solving the problems of user load changes and unstable photovoltaic output. The control system design only consists of a hydropower unit anti-disturbance control system, energy storage unit control module, and microgrid control platform composed of rooftop photovoltaics, water pump units and hydropower units. There are information exchange channels between the microgrid control platform and the hydropower unit anti-disturbance control system and energy storage unit control module; the microgrid control platform collects all information of the microgrid, including power generation information, load information, environmental information, etc., and issues control instructions to the hydropower units, energy storage unit subsystems, etc. through the anti-disturbance control algorithm, so that the microgrid output can be voltage-regulated, frequency-regulated, and active and reactive power controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a schematic diagram of a control system model of the present invention;

[0031] Figure 2 It is a schematic diagram of the microgrid active disturbance rejection control system model of the present invention;

[0032] Figure 3 It is a schematic diagram of the model of the hydropower unit self-disturbance rejection control system of the present invention;

[0033] Figure 4 It is a schematic diagram of a water pump control system model of the present invention;

[0034] Figure 5 It is a schematic diagram of the control model of the photovoltaic power generation system of the present invention;

[0035] Figure 6 It is a schematic diagram of the energy storage unit system control model of the present invention.

[0036] In the figure: 1. Microgrid control platform; 2. Water pump control subsystem; 3. Hydropower unit control subsystem; 4. Energy storage unit control subsystem; 5. Photovoltaic power generation control subsystem; 6. Information detection device; 7. Mains; 8. Microgrid control platform output tracking differentiator; 9. Nonlinear combination; 10. Photovoltaic-small hydropower-energy storage microgrid; 11. Microgrid control platform input tracking differentiator; 12. Hydropower unit output tracking differentiator; 13. Nonlinear combination; 14. Hydropower unit; 15. Hydropower unit input tracking differentiator; 16. PID control algorithm unit; 17. Water pump; 18. Information processing unit; 19. Photovoltaic power generation system; 20. MPPT control unit; 21. Charging optimal control unit; 22. Discharge control unit; 23. Charging controller; 24. DC-AC water pump connected to inverter; 25. Energy storage unit subsystem. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0041] Reference Figure 1-Figure 6 , a microgrid energy management system based on active disturbance rejection control, including a control module, a microgrid active disturbance rejection control system, a hydropower unit active disturbance rejection control system, a water pump system control module, a photovoltaic power generation system control module, and an energy storage unit control module;

[0042] The control module is used to obtain the voltage and current status information of the water pump control subsystem 2, the hydropower unit control subsystem 3, the energy storage unit control subsystem 4, and the photovoltaic power generation control subsystem 5 through the microgrid control platform 1, and obtain the voltage and current status information of the mains 7 through the information detection device 6; Figure 2 The control calculation of the microgrid active disturbance rejection control system is carried out;

[0043] The water pump control subsystem 2 receives the flow Q instruction of the microgrid control platform 1 and controls it through the water pump system control module (that is, Figure 4 The hydropower unit control subsystem 3 receives the input instructions of power, frequency and voltage from the microgrid control platform 1, and Figure 3 The hydroelectric unit self-disturbance rejection control system shown outputs stable electric energy to the mains 7;

[0044] The photovoltaic power generation control subsystem 5 is controlled by the photovoltaic power generation system control module (i.e. Figure 5 The energy storage unit control subsystem 4 receives the charge and discharge curve L input instruction of the microgrid control platform 1, and performs the following operations: Figure 6 The energy storage unit control module shown performs operation control;

[0045] like Figure 2 As shown, the microgrid active disturbance rejection control system consists of a microgrid control platform output tracking differentiator 8, a nonlinear combination 9, a photovoltaic-small hydropower-energy storage microgrid 10 and a microgrid control platform input tracking differentiator 11. The power, frequency and voltage command information obtained by the microgrid control platform 1 is output through the microgrid control platform input tracking differentiator 11 to output a set of state information V1…V n The microgrid control platform obtains a set of feedback information Z1…Z through the microgrid control platform output tracking differentiator 8 n , both through V i -Z i The value of is used to obtain the system control command u0(t) by using the nonlinear combination 9, and the control command output gain b0 is then output through the microgrid control platform tracking differentiator 8 to obtain the feedback output information Z n+1 ,Will The control command is input into the photovoltaic-small hydropower-energy storage microgrid 10 to obtain the system output command power p, frequency f, voltage v, flow rate Q and charge and discharge curve L.

[0046] like Figure 3 As shown, the hydropower unit anti-disturbance control system is composed of a hydropower unit output tracking differentiator 12, a nonlinear combination 13, a hydropower unit 14 and a hydropower unit input tracking differentiator 15. The power, frequency and voltage command information obtained by the microgrid control platform 1 is output through the hydropower unit input tracking differentiator 15 to output a set of state information V1…V n The output of the hydropower unit 3 is obtained through the output tracking differentiator 12 of the hydropower unit to obtain a set of feedback information Z1…Z n , both through V i -Z i The value of is used to obtain the system control command u0(t) by using the nonlinear combination 9, and the control command output gain b0 is then passed through the hydropower unit output tracking differentiator 12 to obtain the feedback output information Z n+1 ,Will The control command is input to the hydroelectric generator set 14 to output power p, frequency f and voltage v to the mains 7.

[0047] In this embodiment, the hydroelectric generator set 14 transmits controllable alternating current to the mains 7 through the hydroelectric generator set self-disturbance rejection control system.

[0048] like Figure 4 As shown, the water pump system control module is composed of a microgrid control platform 1, a PID control algorithm unit 16, a water pump 17 and an information processing unit 18. The information processing unit 18 receives the flow Q instruction output by the microgrid control platform 1, controls the water pump 17 through the PID control algorithm unit 16, and sends status information such as voltage and current to the microgrid control platform 1.

[0049] like Figure 5 As shown, the photovoltaic power generation system control module consists of a microgrid control platform 1, a water pump 17, a photovoltaic power generation system 19 and an MPPT control unit 20. The photovoltaic power generation system 19 performs maximum power generation control through the MPPT control unit 20, and the generated electric energy is directly output to the water pump 17, and the state information such as the voltage and current of the generated electricity is output to the microgrid control platform 1.

[0050] like Figure 6As shown, the energy storage unit control module is composed of the mains 7, the water pump 17, the charging optimal control unit 21, the discharging control unit 22, the charging controller 23, the DC-AC water pump connected to the inverter 24 and the energy storage unit subsystem 25. The energy storage unit subsystem 25 receives the charge and discharge curve L input command of the microgrid control platform 1, and feeds back the voltage and current and other status information, so that the energy storage unit subsystem 25 performs the optimal charging and discharging control after receiving the command of the microgrid control platform 1. The charging optimal control unit 21 receives the charging information and performs the optimal charging control on the energy storage unit subsystem 25 from the mains 7 through the charging controller 23; the discharging control unit 22 receives the discharge command curve L and outputs electric energy to the water pump 17 through the DC-AC water pump connected to the inverter 24.

[0051] In this embodiment, the photovoltaic power generation system 19 only performs maximum power point tracking control, and its power output and the energy storage unit subsystem 25 jointly supply power to the water pump 17 .

[0052] In this embodiment, the microgrid control platform 1 has information input with the water pump control subsystem 2, the hydropower unit control subsystem 3, the energy storage unit control subsystem 4, the photovoltaic power generation control subsystem 5 and the information detection device 6, and the microgrid control platform 1 has control information interaction with the hydropower unit self-disturbance rejection control system, the water pump system control module and the energy storage unit control module.

[0053] The energy management system in this embodiment is a distributed control system used for real-time information detection of the city power 7, in which the core hydropower units and the master control system adopt an anti-disturbance control algorithm, and other systems adopt existing mature control algorithms. The energy management system is the process of system principles and control algorithms, and does not involve specific capacity.

[0054] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A microgrid energy management system based on active disturbance rejection control, characterized in that: Including control module, microgrid self-disturbance control system, hydropower unit self-disturbance control system, water pump system control module, photovoltaic power generation system control module, energy storage unit control module; The control module is used to obtain voltage and current status information of a water pump control subsystem (2), a hydroelectric generator set control subsystem (3), an energy storage unit control subsystem (4), and a photovoltaic power generation control subsystem (5) through a microgrid control platform (1), obtain voltage and current status information of a mains power supply (7) through an information detection device (6), and perform control calculations through a microgrid active disturbance rejection control system; The water pump control subsystem (2) receives the flow rate Q instruction from the microgrid control platform (1) and controls it through the water pump system control module; the hydropower unit control subsystem (3) receives the power, frequency and voltage input instructions from the microgrid control platform (1) and outputs stable electric energy to the city power (7) through the hydropower unit self-anti-disturbance control system; the photovoltaic power generation control subsystem (5) operates through the photovoltaic power generation system control module; the energy storage unit control subsystem (4) receives the charge and discharge curve L input instructions from the microgrid control platform (1) and controls its operation through the energy storage unit control module.

2. A microgrid energy management system based on active disturbance rejection control according to claim 1, characterized in that: The microgrid active disturbance rejection control system is composed of a microgrid control platform output tracking differentiator (8), a nonlinear combination (9), a photovoltaic-small hydropower-energy storage microgrid (10) and a microgrid control platform input tracking differentiator (11). The microgrid control platform (1) obtains power, frequency and voltage command information and outputs a set of state information V1…V n The microgrid control platform obtains a set of feedback information Z1…Z through the microgrid control platform output tracking differentiator (8) n ; By V i -Z i The value of is obtained by using the nonlinear combination (9) to obtain the system control command u0(t), and the control command output gain b0 is output through the microgrid control platform output tracking differentiator (8) to obtain the feedback output information Z n+1 ; Will The control command is input into the photovoltaic-small hydropower-energy storage microgrid (10), and the system output command power p, frequency f, voltage v, flow rate Q and charging and discharging curve L are obtained.

3. A microgrid energy management system based on active disturbance rejection control according to claim 2, characterized in that: The hydroelectric generator set anti-disturbance control system is composed of a hydroelectric generator set output tracking differentiator (12), a nonlinear combination (13), a hydroelectric generator set (14) and a hydroelectric generator set input tracking differentiator (15). The microgrid control platform (1) obtains the power, frequency and voltage command information and outputs a set of state information V1…V n The output of the hydropower unit control subsystem (3) is obtained through the hydropower unit output tracking differentiator (12) to obtain a set of feedback information Z1…Z n ; By V i -Z i The value of is used to obtain the system control command u0(t) by using the nonlinear combination (9), and the control command output gain b0 is passed through the hydropower unit output tracking differentiator (12) to obtain the feedback output information Z n+1 ; Will The control command is input to the hydroelectric generator set (14) to output power p, frequency f and voltage v to the mains (7).

4. A microgrid energy management system based on active disturbance rejection control according to claim 3, characterized in that: The water pump system control module is composed of a microgrid control platform (1), a PID control algorithm unit (16), a water pump (17) and an information processing unit (18); the information processing unit (18) receives a flow rate Q instruction output by the microgrid control platform (1), controls the water pump (17) through the PID control algorithm unit (16), and sends voltage and current state information to the microgrid control platform (1).

5. A microgrid energy management system based on active disturbance rejection control according to claim 4, characterized in that: The photovoltaic power generation system control module is composed of a microgrid control platform (1), a water pump (17), a photovoltaic power generation system (19) and an MPPT control unit (20); the photovoltaic power generation system (19) performs maximum power generation control through the MPPT control unit (20); the generated electric energy is directly output to the water pump (17); and the voltage and current state information of the generated electric energy is output to the microgrid control platform (1).

6. A microgrid energy management system based on active disturbance rejection control according to claim 5, characterized in that: The energy storage unit control module is composed of a mains supply (7), a water pump (17), a charging optimal control unit (21), a discharging control unit (22), a charging controller (23), a DC-AC water pump connection inverter (24) and an energy storage unit subsystem (25), wherein the energy storage unit subsystem (25) receives a charge and discharge curve L input instruction from the microgrid control platform (1) and feeds back voltage and current state information; The charging optimal control unit (21) receives charging information for the energy storage unit subsystem (25), and controls charging from the mains (7) through the charging controller (23); the discharging control unit (22) receives the discharging instruction curve L, and outputs electric energy to the water pump (17) through the DC-AC water pump connected inverter (24).

7. A microgrid energy management system based on active disturbance rejection control according to claim 6, characterized in that: The microgrid control platform (1) has information input with the water pump control subsystem (2), the hydropower unit control subsystem (3), the energy storage unit control subsystem (4), the photovoltaic power generation control subsystem (5) and the information detection device (6), and the microgrid control platform (1) has control information interaction with the hydropower unit self-anti-disturbance control system, the water pump system control module and the energy storage unit control module.

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