Park green energy consumption and management method

Abstract

The invention relates to a park green energy consumption and management method, and the method comprises the following steps: predicting an electrical load in a park, and constructing a park microgrid based on the predicted electrical load; when the power grid runs normally, the park micro-grid is connected into the power grid, the power grid is preferentially used as a park load, then green energy in the park micro-grid is used as load supplement, and residual electricity generated by the green energy is stored in an energy storage battery of the park micro-grid; when the power grid runs abnormally, the park micro-grid is separated from the power grid and independently serves as a park load, the energy storage battery serves as the load, green energy of the park micro-grid serves as load supplement, and when the power grid returns to normal, the park micro-grid is connected into the power grid again.

Description

Technical Field

[0001] The invention relates to a method for absorbing and managing green energy in a park, and belongs to the technical field of power systems. Background Art

[0002] Developing and strengthening the clean energy industry is an important measure to promote the adjustment of my country's energy structure, and achieving full absorption is the key guarantee for the high-quality development of the clean energy industry.

[0003] With the increasing global attention to environmental protection and sustainable development, green energy has become an important direction for future energy development. As an important carrier of modern industrial development, the energy consumption mode of industrial parks is of great significance to the promotion of green energy development. Therefore, studying the key technologies of green energy consumption and smart microgrids in industrial parks will not only help improve the energy utilization efficiency of industrial parks, but also provide strong support for the development of green energy in the whole society.

[0004] In China, as the country continues to promote renewable energy and green development, the research and application of green energy consumption technology in parks has developed rapidly. Many scholars and institutions have conducted in-depth research on park energy structure, energy management, energy storage technology and other aspects.

[0005] The current status of research on green energy consumption technology in industrial parks shows a positive development trend. Through extensive literature review and case analysis, it can be seen that certain research results have been achieved in this field. At present, the research on green energy consumption technology in industrial parks mainly focuses on the efficient use of energy, the reduction of environmental pollution and the stable operation of the system. However, the existing technologies all use self-built new energy power generation as an independent management unit, which cannot interact and uniformly manage with the power grid. In this case, how to realize the consumption and use of new energy in the park has become a new technical problem.

[0006] The invention patent with the announcement number "CN117175694B" discloses a microgrid optimization scheduling method based on new energy consumption, including the following steps: extracting wind power data and load data from energy data; obtaining predicted wind power data of distributed energy and predicted demand data of load-side resources; generating microgrid power scheduling strategy; implementing microgrid power distribution; evaluating and optimizing the scheduling strategy; reapplying the optimized scheduling strategy to the microgrid until the optimal scheduling strategy is achieved. The present invention can improve the efficiency of energy use by accurately predicting and optimizing power demand and wind power supply, and by optimizing the scheduling strategy of wind power and load resources, it effectively promotes the use of green energy, alleviates environmental pressure, and promotes sustainable development, thereby improving the intelligence level of microgrids, thereby improving operating efficiency and reducing management costs.

[0007] However, in the above solution, self-built renewable energy power generation is an independent management unit, which cannot interact and be uniformly managed with the main power grid, making management more difficult. Summary of the invention

[0008] In order to solve the above problems existing in the prior art, the present invention proposes a method for absorbing and managing green energy in a park.

[0009] The technical solution of the present invention is as follows:

[0010] In one aspect, the present invention provides a method for absorbing and managing green energy in a park, comprising the following steps:

[0011] Predict the power load in the park and build a park microgrid based on the predicted power load;

[0012] When the power grid is operating normally, the park microgrid is connected to the grid, and the grid is used first as the park load. Secondly, the green energy in the park microgrid is used as the load supplement, and the surplus electricity generated by the green energy is stored in the energy storage battery of the park microgrid;

[0013] When the grid operates abnormally, the park microgrid disconnects from the grid and acts independently as the park load, with the energy storage battery acting as the load and the green energy of the park microgrid serving as a load supplement. When the grid returns to normal, the park microgrid is reintegrated into the grid.

[0014] As a preferred implementation mode of the present invention, the power load forecasting and planning in the park is carried out by using the load natural growth rate method, specifically:

[0015] Through the load growth of the park over the years, the annual load growth rate in historical years is calculated, and the load growth rate in the planning year is determined, thereby obtaining the electricity load in the planning year.

[0016] As a preferred implementation mode of the present invention, the park microgrid includes energy storage batteries, energy storage converters, on-grid and off-grid power distribution, and distributed energy, wherein the distributed energy includes green energy and non-green energy;

[0017] When the power grid operates abnormally, the park microgrid disconnects from the grid and acts as an independent park load. The energy storage battery serves as the load, and the green energy of the park microgrid is used as a load supplement. When power is insufficient, it is supplemented by non-green energy.

[0018] As a preferred implementation mode of the present invention, when the park microgrid is disconnected from the grid and operates independently, the energy storage converter adopts a V / F control mode to maintain the stable operation of the microgrid. The specific steps are:

[0019] The energy storage converter adopts dual closed-loop control, which is divided into a current inner loop and a voltage outer loop. The voltage outer loop performs PI control after comparing the difference between the AC output voltage value and the preset reference voltage value to obtain the reference current value of the voltage inner loop, as shown in the following formula:

[0020]

[0021]

[0022] Where: i dref 、f qref are the reference current values ​​of dq axis respectively; U dref , U qref are the reference voltage values ​​of dq axis respectively; U d , U q are the output voltage values ​​of dq axis in AC measurement respectively; k p1 , k i1 are the PI control proportional coefficient and integral coefficient of the voltage outer loop d axis respectively; k p3 , k i3 are the PI control proportional coefficient and integral coefficient of the voltage outer loop q axis respectively; s is the system function;

[0023] The current inner loop performs PI control after comparing the difference between the current value output by the AC measurement and the reference current value to obtain the original output voltage component, as shown in the following formula:

[0024]

[0025]

[0026] Where: u d1 、u q1 are the original output voltage components of the dq axis respectively; i d 、i q are the output currents of dq axis in AC measurement respectively; k p2 , k i2 are the PI control proportional coefficient and integral coefficient of the current inner loop d axis respectively; k p4 , k i4 They are the PI control proportional coefficient and integral coefficient of the q-axis of the inner current loop respectively;

[0027] The original output voltage component is transformed into a three-phase AC voltage through the coordinate axis, and then generates a drive signal through SVPWM to invert and output three-phase AC power.

[0028] As a preferred implementation mode of the present invention, when the park microgrid is connected to the power grid, the energy storage inverter adopts a micro-source working mode to provide power output, and in this working mode the energy storage inverter adopts a P / Q control method.

[0029] As a preferred implementation mode of the present invention, the energy storage converter has a virtual synchronous machine function.

[0030] As a preferred embodiment of the present invention, the energy storage battery is a lithium iron phosphate battery.

[0031] On the other hand, the present invention also provides a park green energy consumption and management system, including a park microgrid construction module, a park microgrid grid-connected management module, and a park microgrid off-grid management module;

[0032] The park microgrid construction module is used to predict the power load in the park and construct the park microgrid based on the predicted power load;

[0033] The park microgrid grid connection management module is used to connect the park microgrid to the grid when the grid is operating normally, give priority to using the grid as the park load, and secondly use the green energy in the park microgrid as the load supplement, and store the surplus electricity generated by the green energy in the energy storage battery of the park microgrid;

[0034] The campus microgrid grid-connected management module and the microgrid off-grid dispatching module are used to disconnect the campus microgrid from the grid and serve as an independent campus load when the grid operates abnormally, with the energy storage battery serving as the load and the green energy of the campus microgrid serving as a load supplement. When the grid returns to normal, the campus microgrid is reintegrated into the grid.

[0035] On the other hand, the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described in any embodiment of the present invention when executing the program.

[0036] In yet another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described in any embodiment of the present invention.

[0037] The present invention has the following beneficial effects:

[0038] 1. The present invention is based on the microgrid, which can realize the effective dispatch and control of various energy sources in the park, improve energy utilization efficiency, and reduce energy waste. At the same time, the interaction ability between the microgrid and the main grid can enhance the stability and reliability of the power system, providing a strong guarantee for the normal operation of the industrial park. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be understood that the step numbers used in this document are only for convenience of description and are not intended to limit the order in which the steps are executed.

[0042] It should be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0043] The terms “include” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0044] The term "and / or" means and includes any and all possible combinations of one or more of the associated listed items.

[0045] Embodiment 1:

[0046] See also Figure 1 , a method for consuming and managing green energy in a park, comprising the following steps:

[0047] Predict the power load in the park and build a park microgrid based on the predicted power load;

[0048] When the power grid is operating normally, the park microgrid is connected to the grid, and the grid is used first as the park load. Secondly, the green energy in the park microgrid is used as the load supplement, and the surplus electricity generated by the green energy is stored in the energy storage battery of the park microgrid;

[0049] When the grid operates abnormally, the park microgrid disconnects from the grid and acts independently as the park load, with the energy storage battery acting as the load and the green energy of the park microgrid serving as a load supplement. When the grid returns to normal, the park microgrid is reintegrated into the grid.

[0050] As a preferred implementation mode of the present invention, the power load forecasting and planning in the park is carried out by using the load natural growth rate method, specifically:

[0051] Through the load growth of the park over the years, the annual load growth rate in historical years is calculated, and the load growth rate in the planning year is determined, thereby obtaining the electricity load in the planning year.

[0052] In this embodiment, the overall energy consumption of the park is planned as follows: the power load of the park is mainly consumed by the sheet metal workshop, the assembly workshop, the office area, and the employee living area. According to the existing power demand, the park plans to install two transformers of 630kVA and 240kVA.

[0053] Based on the actual value of the park's maximum electricity load in 2023 and the average annual growth rate of 12.1% in the past three years, the maximum load from 2024 to 2026 is calculated, and the long-term annual load from 2025 to the long-term saturation year 2035 is calculated at an average annual growth rate of 20%.

[0054] Combined with the overall planning of the park and the forecast of natural growth rate, it is calculated that the regional load of the park will be 139MW in 2024 and 200MW in 2026. The microgrid photovoltaic power generation power supply can basically meet the load demand when the roof of the sheet metal production building (installed capacity 934KW) is jointly output.

[0055] Before building the park microgrid, the construction requirements were analyzed:

[0056] Build the park into a smart microgrid application demonstration project integrating city power + photovoltaic + energy storage + energy efficiency management;

[0057] In the case of abnormal external power supply, the self-balancing control within the microgrid can ensure the uninterrupted operation of important loads in the microgrid and improve the reliability of microgrid power supply;

[0058] Through the internal coordinated control of power supply, energy storage and load, the internal renewable energy can be fully absorbed, reducing the impact of high penetration rate renewable energy on the power grid;

[0059] Through the coordinated management of internal power supply, energy storage and other resources, the voltage level of power supply can be stabilized and the power quality level within the micro-grid can be improved;

[0060] As a controllable whole, the microgrid can also provide operational support for the safe operation of the regional power grid.

[0061] According to the above requirements, a park microgrid is constructed, which is mainly composed of energy storage batteries, energy storage converters, grid-connected and off-grid power distribution, distributed energy (wind power, photovoltaic power, diesel power, hydropower), etc. It can be operated both on-grid and off-grid.

[0062] When the power grid is normal, the microgrid is connected to the grid, and the load and battery charging are preferentially powered by photovoltaic and wind power (hydropower), and the surplus power is connected to the grid. The microgrid can perform functions such as peak shaving and valley filling, and smoothing the transformer demand power.

[0063] When the power grid is abnormal, the microgrid automatically disconnects from the main grid and operates independently, with batteries supplying power to the load, supplemented by photovoltaic and wind power, and diesel or hydropower generation when power is insufficient.

[0064] When the power grid returns to normal, the microgrid will automatically be integrated into the large power grid.

[0065] As a preferred implementation method of this embodiment, when the park microgrid is disconnected from the grid and operates independently, the energy storage inverter adopts a V / F control mode (V / F control means that when the inverter is off-grid, in order to ensure the stable operation of the system, the microgrid bus voltage and frequency are controlled within a certain range) to maintain the stable operation of the microgrid. The specific steps are:

[0066] The energy storage converter adopts dual closed-loop control, which is divided into a current inner loop and a voltage outer loop. The voltage outer loop performs PI control after comparing the difference between the AC output voltage value and the preset reference voltage value to obtain the reference current value of the voltage inner loop, as shown in the following formula:

[0067]

[0068]

[0069] Where: i dref 、f qref are the reference current values ​​of dq axis respectively; U dref , U qref are the reference voltage values ​​of dq axis respectively; U d , U q are the output voltage values ​​of dq axis in AC measurement respectively; k p1 , k i1 are the PI control proportional coefficient and integral coefficient of the voltage outer loop d axis respectively; k p3 , k i3 are the PI control proportional coefficient and integral coefficient of the voltage outer loop q axis respectively; s is the system function;

[0070] The current inner loop performs PI control after comparing the difference between the current value output by the AC measurement and the reference current value to obtain the original output voltage component, as shown in the following formula:

[0071]

[0072]

[0073] Where: u d1 、u q1 are the original output voltage components of the dq axis respectively; i d 、i qare the output currents of dq axis in AC measurement respectively; k p2 , k i2 are the PI control proportional coefficient and integral coefficient of the current inner loop d axis respectively; k p4 , k i4 They are the PI control proportional coefficient and integral coefficient of the q-axis of the inner current loop respectively;

[0074] The original output voltage component of the dq coordinate axis is obtained by obtaining the value of the βγ coordinate axis. Under the action of the phase-locked loop technology, its three-phase AC voltage is obtained, and then the drive signal is generated through SVPWM to invert and output three-phase AC power.

[0075] In this embodiment, the d-axis reference voltage is set to 311V, the phase-locked loop frequency is controlled at 50HZ, the filter inductance is set to 3mH, the capacitance is set to 1.5mF, the q-axis reference voltage is set to 0, the energy storage battery is boosted by DC / DC, and the DC side voltage is stabilized at 600V. Then, the inverter output voltage amplitude is 311V and the frequency is stabilized at 50Hz.

[0076] As a preferred implementation mode of this embodiment, when the park microgrid is connected to the power grid, the energy storage converter adopts the micro-source working mode to provide power output, and in this working mode, the energy storage converter adopts the P / Q control mode;

[0077] P / Q control means that the energy storage converter outputs active power and reactive power according to system parameters. The inverter controls the output current through the voltage output on the AC side. The three-phase voltage and current can be used to calculate the output power, active power and reactive power. The phase-locked loop technology is used to control the frequency of the microgrid (usually 50HZ).

[0078] When the microgrid is working in a state of sufficient energy, the energy storage converter often adopts P / Q control. According to the output current of distributed energy, the output current is converted from the abe coordinate axis to the dq coordinate axis through Park transformation. After the output voltage of the inverter is obtained, the active power and reactive power output by the inverter are obtained through orthogonal Park transformation. The active power and reactive power required by the system load are set as reference values, and they are controlled to improve the energy efficiency of the microgrid system.

[0079] As a preferred implementation of this embodiment, the energy storage converter has a virtual synchronous machine function;

[0080] The virtual synchronous machine is based on advanced synchronous inverter technology and energy storage units. By simulating the active frequency modulation and reactive voltage regulation of synchronous generators, the new energy power generation equipment can be comparable to traditional synchronous generators such as thermal power in terms of operation mechanism and external characteristics. The virtual synchronous machine technology can track the system voltage and frequency changes in real time, simulate the synchronous generator primary frequency modulation and automatic voltage regulation AVR control mechanism, realize the automatic regulation of active and reactive power, adaptively participate in the system frequency and voltage regulation, and damp the system oscillation by simulating the synchronous machine rotor motion equation and electromechanical transient equation in the power electronic equipment control link, configuring appropriate energy storage units or using the inertia of the new energy power generation equipment itself, so as to achieve the purpose of improving the safe and stable operation level of the regional power grid.

[0081] Conventional DC / AC modules have fast response speed, almost no rotational inertia, and are difficult to participate in grid regulation, which poses a huge challenge to the safe and stable operation of distribution networks and microgrids. Based on the high impedance, large inertia, and self-synchronization characteristics of traditional synchronous generators, DC / AC has the characteristics of synchronous generators in both external characteristics and mechanisms, namely virtual synchronous generator (VSG) technology. According to the operating characteristics of the system and the strength of the grid, a method of surpassing virtual synchronous generators (VSG) with self-optimization of rotational inertia and damping is adopted. By adaptively changing its inertia and damping size, the grid-connected stability domain of the DG system is improved, and the "grid-friendly" characteristics and networking characteristics of the DC / AC module are realized.

[0082] The virtual synchronous motor control strategy not only improves the stability of the microgrid itself, but also can further draw on the mature control technology in the large power grid, providing a broader prospect for the application of microgrids. At the same time, the virtual synchronous motor control strategy combines the operating characteristics of the synchronous motor and the inverter's own rapid response and flexible control characteristics, which is more conducive to meeting the technical requirements of microgrid operation and control.

[0083] The virtual synchronous generator is based on power electronic converter and energy storage link. The synchronous machine rotor motion and electromechanical transient equation are introduced in the control, which can be equivalent to a voltage source with controllable power angle and amplitude: the active power output is adjusted by changing the voltage power angle δ, and the reactive power output is adjusted by changing the internal potential amplitude E. When the system frequency increases / decreases, the virtual synchronous machine can control the speed of energy storage / release of energy in the energy storage unit, play a role equivalent to the storage / release of kinetic energy of the synchronous generator rotor, and suppress the sudden change of power system frequency. When the frequency oscillates, the power generated to prevent the frequency oscillation is controlled, which plays a role equivalent to the additional damping winding of the synchronous generator.

[0084] As a preferred implementation mode of this embodiment, the energy storage battery adopts a lithium iron phosphate battery; compared with conventional lead-acid batteries, lithium iron phosphate batteries have a long service life, high energy density, low maintenance, and no memory effect. At the same time, they are equipped with a BMS battery management system, which can maintain battery balance, track battery power, and protect the battery from overcharging and over-discharging.

[0085] In this embodiment, an energy efficiency monitoring and management platform is also constructed to monitor and manage the power distribution switches (current, voltage, temperature, harmonics and other key parameters) and the components of the microgrid system (bidirectional converters, energy storage batteries) in real time. The monitoring system performs multi-dimensional analysis and calculation on the real-time monitoring data and sets the early warning threshold to achieve early warning of accidents and prevent them before they happen. System operation data and equipment pre-alarm information can be viewed in real time through computer web, mobile phone APP, etc., which reduces the workload and maintenance costs of equipment maintenance personnel, and the power supply bureau personnel can remotely monitor the operation of the microgrid in real time.

[0086] Embodiment 2:

[0087] A park green energy consumption and management system, including a park microgrid construction module, a park microgrid grid-connected management module and a park microgrid off-grid management module;

[0088] The park microgrid construction module is used to predict the power load in the park and construct the park microgrid based on the predicted power load;

[0089] The park microgrid grid connection management module is used to connect the park microgrid to the grid when the grid is operating normally, give priority to using the grid as the park load, and secondly use the green energy in the park microgrid as the load supplement, and store the surplus electricity generated by the green energy in the energy storage battery of the park microgrid;

[0090] The campus microgrid grid-connected management module and the microgrid off-grid dispatching module are used to disconnect the campus microgrid from the grid and serve as an independent campus load when the grid operates abnormally, with the energy storage battery serving as the load and the green energy of the campus microgrid serving as a load supplement. When the grid returns to normal, the campus microgrid is reintegrated into the grid.

[0091] This system is used to implement the functions in the first embodiment, which will not be described in detail here.

[0092] Embodiment three:

[0093] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described in any embodiment of the present invention when executing the program.

[0094] Embodiment 4:

[0095] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the method described in any embodiment of the present invention is implemented.

[0096] In the embodiments of the present application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.

[0097] Those of ordinary skill in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented in a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0098] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0099] In several embodiments provided in the present application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as: ROM), random access memory (Random Access Memory; hereinafter referred to as: RAM), disk or optical disk, and other media that can store program codes.

[0100] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for absorbing and managing green energy in a park, characterized in that: The following steps are involved: Predict the power load in the park and build a park microgrid based on the predicted power load; When the power grid is operating normally, the park microgrid is connected to the grid, and the grid is used first as the park load. Secondly, the green energy in the park microgrid is used as the load supplement, and the surplus electricity generated by the green energy is stored in the energy storage battery of the park microgrid; When the grid operates abnormally, the park microgrid disconnects from the grid and acts independently as the park load, with the energy storage battery acting as the load and the green energy of the park microgrid serving as a load supplement. When the grid returns to normal, the park microgrid is reintegrated into the grid.

2. A method for absorbing and managing green energy in a park according to claim 1, characterized in that: The power load forecasting and planning in the park is carried out by using the load natural growth rate method, specifically: Through the load growth of the park over the years, the annual load growth rate in historical years is calculated, and the load growth rate in the planning year is determined, thereby obtaining the electricity load in the planning year.

3. A method for absorbing and managing green energy in a park according to claim 1, characterized in that: The park microgrid includes energy storage batteries, energy storage converters, on-grid and off-grid power distribution, and distributed energy, wherein the distributed energy includes green energy and non-green energy; When the power grid operates abnormally, the park microgrid disconnects from the grid and acts as an independent park load. The energy storage battery serves as the load, and the green energy of the park microgrid is used as a load supplement. When power is insufficient, it is supplemented by non-green energy.

4. A method for absorbing and managing green energy in a park according to claim 3, characterized in that: When the park microgrid is disconnected from the grid and operates independently, the energy storage converter adopts V / F control mode to maintain the stable operation of the microgrid. The specific steps are as follows: The energy storage converter adopts dual closed-loop control, which is divided into a current inner loop and a voltage outer loop. The voltage outer loop performs PI control after comparing the difference between the AC output voltage value and the preset reference voltage value to obtain the reference current value of the voltage inner loop, as shown in the following formula: Where: i dref 、i qref are the reference current values ​​of dq axis respectively; U dref , U qref are the reference voltage values ​​of dq axis respectively; U d , U q are the output voltage values ​​of dq axis in AC measurement respectively; k p1 , k i1 are the PI control proportional coefficient and integral coefficient of the voltage outer loop d axis respectively; k p3 , k i3 are the PI control proportional coefficient and integral coefficient of the voltage outer loop q axis respectively; s is the system function; The current inner loop performs PI control after comparing the difference between the current value output by the AC measurement and the reference current value to obtain the original output voltage component, as shown in the following formula: Where: u d1 、u q1 are the original output voltage components of the dq axis respectively; i d 、i q are the output currents of dq axis in AC measurement respectively; k p2 , k i2 are the PI control proportional coefficient and integral coefficient of the current inner loop d axis respectively; k p4 , k i4 They are the PI control proportional coefficient and integral coefficient of the q-axis of the inner current loop respectively; The original output voltage component is transformed into a three-phase AC voltage through the coordinate axis, and then generates a drive signal through SVPWM to invert and output three-phase AC power.

5. A method for absorbing and managing green energy in a park according to claim 3, characterized in that: When the park microgrid is connected to the power grid, the energy storage converter adopts the micro-source working mode to provide power output. In this working mode, the energy storage converter adopts the P / Q control method.

6. A method for absorbing and managing green energy in a park according to claim 3, characterized in that: The energy storage converter has a virtual synchronous machine function.

7. A method for absorbing and managing green energy in a park according to claim 3, characterized in that: The energy storage battery is a lithium iron phosphate battery.

8. A green energy consumption and management system for a park, characterized in that: It includes a park microgrid construction module, a park microgrid grid-connected management module, and a park microgrid off-grid management module; The park microgrid construction module is used to predict the power load in the park and construct the park microgrid based on the predicted power load; The park microgrid grid connection management module is used to connect the park microgrid to the grid when the grid is operating normally, give priority to using the grid as the park load, and secondly use the green energy in the park microgrid as the load supplement, and store the surplus electricity generated by the green energy in the energy storage battery of the park microgrid; The campus microgrid grid-connected management module and the microgrid off-grid dispatching module are used to disconnect the campus microgrid from the grid and serve as an independent campus load when the grid operates abnormally, with the energy storage battery serving as the load and the green energy of the campus microgrid serving as a load supplement. When the grid returns to normal, the campus microgrid is reintegrated into the grid.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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