CN212412772U - Energy storage type microgrid - Google Patents
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- CN212412772U CN212412772U CN202021708459.4U CN202021708459U CN212412772U CN 212412772 U CN212412772 U CN 212412772U CN 202021708459 U CN202021708459 U CN 202021708459U CN 212412772 U CN212412772 U CN 212412772U
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Abstract
The embodiment of the utility model discloses an energy storage type microgrid, which comprises a monitoring and stabilizing device connected to the microgrid, an independent power supply device and a renewable energy power generation system; the renewable energy power generation system comprises a plurality of renewable energy power generation subsystems and a plurality of first energy storage devices, each first energy storage device is connected with at least one renewable energy power generation subsystem, and the first energy storage devices are used for absorbing electric energy of the corresponding connected renewable energy power generation subsystems or providing electric power for the corresponding connected renewable energy power generation subsystems according to control instructions of the master control device; the independent power supply device is used for receiving a control instruction of the master control device to supply power to the energy storage type micro-grid when the independent power supply device is separated from the main grid; the microgrid monitoring and stabilizing device comprises a second energy storage device, and the second energy storage device is connected to the bus. The utility model discloses can improve the electric energy quality treatment ability and the response speed of little electric wire netting.
Description
Technical Field
The utility model relates to an energy technical field especially relates to an energy storage formula microgrid.
Background
With the trend of more and more intense energy in modern society, people put higher and higher requirements on energy equipment. A Micro-Grid (Micro-Grid), also called Micro-Grid, is a new type of power supply network. The micro-grid is an autonomous system capable of realizing self control, protection and management, and can be operated in a grid-connected mode with an external power grid or in an isolated mode. The micro grid is a concept relative to the traditional large grid. In the prior art, the main energy source of the microgrid is a light energy source or a wind energy source, but the electrical parameter fluctuation of the microgrid is large due to the instability of the light energy source and the wind energy source, and the preset standard is difficult to meet.
SUMMERY OF THE UTILITY MODEL
In view of the above problem, the utility model provides an energy storage formula microgrid.
An embodiment of the utility model provides an energy storage formula microgrid, energy storage formula microgrid provides electric power to main electric wire netting when merging into main electric wire netting operation, when breaking away from main electric wire netting, isolated island operation, this energy storage formula electric wire netting includes renewable energy power generation system, microgrid control stabilising arrangement and independent power supply unit;
the renewable energy power generation system, the micro-grid monitoring and stabilizing device and the independent power supply device are connected to a bus;
the renewable energy power generation system comprises a plurality of renewable energy power generation subsystems and a plurality of first energy storage devices, each first energy storage device is connected with at least one renewable energy power generation subsystem, and the first energy storage devices are used for storing electric energy of the corresponding connected renewable energy power generation subsystems or providing electric power for the corresponding connected renewable energy power generation subsystems;
the microgrid monitoring and stabilizing device comprises a monitoring device and a second energy storage device, wherein the monitoring device is used for acquiring electrical parameters of the energy storage type microgrid, and the second energy storage device is connected to the bus and is used for receiving electric energy through the bus or providing electric power for a load connected to the bus;
the independent power supply device is used for supplying power to the energy storage type micro-grid when the independent power supply device is separated from a main grid.
The utility model discloses an another embodiment provides an energy storage formula microgrid, renewable energy power generation subsystem is the same with the figure of first energy deposit device, and each renewable energy power generation subsystem corresponds and connects a first energy deposit device.
In the energy storage type microgrid, the independent power supply device is at least one of an internal combustion type generator, a mechanical power supply device and a chemical power supply device.
The utility model discloses an energy storage formula microgrid, microgrid control stabilising arrangement still includes SVG, SVG is connected to the generating line is used for receiving total control device's control command is in order to compensate energy storage formula microgrid's idle work.
In the energy storage type microgrid, the microgrid monitoring and stabilizing device further comprises a load adjusting device, and the load adjusting device is connected to the bus and used for receiving the instruction sent by the master control device to adjust the load.
In the energy storage type microgrid, the renewable energy power generation system comprises at least one of a wind power generation system, a hydroelectric power generation system, a tidal power generation system and a photovoltaic power generation system.
In the energy storage type microgrid, the first energy storage device and the second energy storage device comprise at least one of a chemical battery, a mechanical energy storage device and a super capacitor.
In the energy storage type microgrid, the renewable energy power generation subsystem comprises a renewable energy generator and a transformation device, the renewable energy generator is connected with the transformation device in a one-to-one manner, and the transformation device is connected to the bus.
In the energy storage type microgrid, the microgrid monitoring and stabilizing device further comprises a filtering device, and the filtering device is connected with a power generation outlet of the renewable energy generator.
The utility model discloses a still another embodiment provides an energy storage formula microgrid, still includes main electric wire netting interface, is used for connecting main electric wire netting works as energy storage formula microgrid is connected to during the main electric wire netting, independent power supply unit break off with renewable energy power generation system's connection.
The utility model provides an energy storage type micro-grid, which comprises a micro-grid monitoring and stabilizing device, an independent power supply device and a renewable energy power generation system; the renewable energy power generation system, the independent power supply device and the micro-grid monitoring and stabilizing device are connected to a bus; the renewable energy power generation system comprises a plurality of renewable energy power generation subsystems and a plurality of first energy storage devices, each first energy storage device is connected with at least one renewable energy power generation subsystem, and the first energy storage devices are used for storing electric energy of the corresponding connected renewable energy power generation subsystems or providing electric power for the corresponding connected renewable energy power generation subsystems; the microgrid monitoring and stabilizing device comprises a monitoring device and a second energy storage device, wherein the monitoring device is used for acquiring electrical parameters of the energy storage type microgrid, and the second energy storage device is connected to the bus and is used for receiving electric energy through the bus or providing electric power for a load connected to the bus; the independent power supply device is used for supplying power to the energy storage type micro-grid when the independent power supply device is separated from a main grid. Through the cooperation of using of first energy reserve device and second energy reserve device, can improve the electric energy quality control ability and the response speed of little electric wire netting.
Drawings
In order to illustrate the technical solution of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
Fig. 1 shows a schematic structural diagram of an energy storage type microgrid provided by an embodiment of the present invention;
fig. 2 shows a schematic structural diagram of another energy storage type microgrid provided by an embodiment of the present invention.
Description of the main element symbols:
1-energy storage type micro-grid; 10-independent power supply means; 20-a master control device; 30-a renewable energy power generation system; 40-a microgrid monitoring and stabilizing device; 31-a renewable energy power generation subsystem; 32-a first energy reserve; 41-a second energy reserve; 42-SVG; 43-load adjusting means; 44-a filtering means; 50-main grid; g1-first renewable energy generator; g2 — a second renewable energy generator; f1-first voltage transformation device; f2-second voltage transformation device; f3-third voltage transformation device; f4-fourth voltage transformation device; k1 — main grid interface; r1 — first active filter; r2 — second active filter; m-bus.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
The utility model provides a renewable energy power generation system of energy storage formula microgrid includes a plurality of renewable energy power generation electronic systems and a plurality of first energy deposit device in, at least one renewable energy power generation subsystem is connected to each first energy deposit device, a plurality of first energy deposit devices among the renewable energy power generation system, on the one hand, the electric energy quality of little electric wire netting can be realized adjusting in multiple points, after information-based management, can set up nimble charge-discharge strategy for each renewable energy power generation subsystem, the flexible little electric wire netting steady operation that supports, and utilize first energy deposit device to charge or discharge and adjust the electric energy quality in the renewable energy power generation subsystem that corresponds the connection, the governing speed is more quick, shorten the time of electric energy quality optimization; on the other hand, the energy storage energy density of the first energy storage devices distributed at multiple points is low, and a fire is not easy to cause.
The utility model provides a little electric wire netting control stabilising arrangement of energy storage formula little electric wire netting second energy deposit device that includes can receive the electric energy that comes from renewable energy power generation system, it is surplus at renewable energy power generation system productivity, frequency is higher than in the little electric wire netting and predetermines the frequency upper limit, charge, it is not enough at renewable energy power generation system productivity, frequency is less than in the little electric wire netting and predetermines the frequency lower limit, discharge that can be timely, for the power consumption load in little electric wire netting in time provides electric power support, avoid first energy deposit device after discharging, can not in time provide sufficient electric power for the power consumption load in little electric wire netting.
The utility model provides a little electric wire netting of energy storage formula uses through the cooperation of first energy deposit device and second energy deposit device, can accelerate little electric wire netting's electric energy quality to administer speed, shortens electric energy quality and administers the time.
Example 1
In the embodiment, referring to fig. 1, an energy storage type microgrid 1 is shown, wherein the energy storage type microgrid 1 supplies power to a main power grid when being incorporated into the main power grid for operation, and operates in an isolated island when being separated from the main power grid, and the energy storage type microgrid 1 comprises a microgrid monitoring and stabilizing device 40, an independent power supply device 10 and a renewable energy power generation system 30.
The renewable energy power generation system 30, the independent power supply device 10 and the micro-grid monitoring and stabilizing device 40 are connected to the bus M; the independent power supply device 10 is used for receiving a control instruction of the master control device 20 to supply power to the energy storage type micro-grid 1 when the independent power supply device is separated from the main grid 50; the renewable energy power generation system 30 comprises a plurality of renewable energy power generation subsystems 31 and a plurality of first energy storage devices 32, each first energy storage device 32 is connected with at least one renewable energy power generation subsystem 31, and the first energy storage devices 32 are used for absorbing electric energy of the corresponding connected renewable energy power generation subsystem 31 or providing electric power for the corresponding connected renewable energy power generation subsystem 31 according to a control instruction of the general control device 20. As shown in fig. 2, the microgrid monitoring and stabilizing device 40 includes a monitoring device disposed at a preset sampling point and a second energy storage device 41, the monitoring device is configured to obtain an electrical parameter of the microgrid, and the second energy storage device 41 is connected to the bus M and is configured to receive electrical energy via the bus M or provide electrical power to a load connected to the bus M.
Further, the electrical parameters comprise frequency parameters, voltage parameters and current parameters of the microgrid, and the monitoring device comprises a current detection element, a voltage detection element and a frequency detection element.
The master control device 20 can be used for controlling the independent power supply device 10 to supply power to the renewable energy power generation system 30 according to the electrical parameters obtained by the microgrid monitoring and stabilizing device 40 when the energy storage type microgrid 1 is disconnected from the main power grid.
The overall control device 20 can also be used to: when the frequency parameter acquired by the monitoring device of the microgrid monitoring and stabilizing device 40 is smaller than a preset first frequency parameter threshold value, controlling each first energy storage device 32 to discharge so as to provide power for the corresponding connected renewable energy power generation subsystem 31, and controlling the second energy storage device 41 to discharge so as to provide power for the power load in the energy storage type microgrid 1; when the frequency parameter is greater than the preset second frequency parameter threshold, each first energy storage device 32 is controlled to receive the electric energy of the corresponding connected renewable energy power generation subsystem 31, and the second energy storage device 41 is controlled to receive the electric energy from the renewable energy power generation system 30.
The first energy storage device 32 modularizes the energy storage inverters (PCS), for example, 10 energy storage inverters of 50kW are connected in parallel on the ac side, so as to ensure the external characteristics to be unchanged, and the internal characteristics are dispersed, that is, each energy storage inverter of 50kW is connected to a battery on the dc side, so as to realize the efficacy of the energy storage inverter of 500kW by using 10 energy storage inverters of 50 kW. The first energy storage device 32 does not perform direct current confluence between the battery clusters, so that inter-cluster circulation can be eliminated, the capacity short plate effect can be eliminated, and the service life of the battery can be prolonged.
The second energy storage device 41 is a high-voltage cascade energy storage system, for example, 10 energy storage inverters of 50kW are connected in series on the ac side, so that a transformer can be omitted, voltage boosting is not needed, the energy storage inverters can be directly connected with the bus M, and the system regulation efficiency is higher.
When the energy storage type microgrid 1 is separated from a main power grid and an island operates independently, the master control device 20 can acquire frequency parameters which can reflect the quality of electric energy and are preset at a plurality of sampling points in the energy storage type microgrid 1 through the monitoring device of the microgrid monitoring and stabilizing device 40, calculate the frequency deviation by using the frequency of each sampling point, and issue an active control instruction and a frequency modulation index value to the renewable energy power generation subsystem 31 and the first energy storage device 32 in the renewable energy power generation system 30 and the second energy storage device 41 in the microgrid monitoring and stabilizing device 40 according to the frequency deviation. The first energy storage device 32 and the second energy storage device 41 respond simultaneously, but the time for adjusting the frequency of each renewable energy power generation subsystem 31 and each first energy storage device 32 in cooperation with each other may be too long, and the second energy storage device 41 can realize rapid frequency adjustment to maintain stable frequency in the energy storage type microgrid 1. In addition, the renewable energy power generation system 30 is difficult to respond to the small fluctuation, the pulsating component of the slow output, and the sustained component, and the second energy reserve device 41 is required to adjust the small fluctuation, the pulsating component of the slow output, and the sustained component.
It should be understood that the renewable energy power generation system 30 formed by the renewable energy power generation subsystem 31 and the first energy storage device 32 has an internal frequency modulation function, the first energy storage device 32 can receive the excess capacity of the corresponding connected renewable energy power generation subsystem 31, when the capacity of the renewable energy power generation subsystem 31 is insufficient, the corresponding connected first energy storage device 32 can provide power to the corresponding renewable energy power generation subsystem 31 in time, and the first energy storage device 32 adjusts the internal speed of the renewable energy power generation system 30 more rapidly.
The first energy storage device 32 and the second energy storage device 41 complement each other to exert their advantages, so that the energy storage microgrid 1 has efficient and stable frequency modulation capability.
Example 2
Further, referring to fig. 2, the number of the renewable energy power generation subsystems 31 is the same as that of the first energy storage devices 32, and each renewable energy power generation subsystem 31 is correspondingly connected with one first energy storage device 32. First energy reserve device 32 can provide the back-up source for renewable energy power generation subsystem, guarantees also can start, shut down when energy storage formula microgrid breaks away from the major network.
The renewable energy power generation system 30 realizes one-to-one matching use of the first energy storage device 32 and the renewable energy power generation subsystem 31, when the capacity of the renewable energy power generation subsystem 31 is too high, the uniquely corresponding first energy storage device 32 is charged, so that the electric energy of the uniquely corresponding renewable energy power generation subsystem 31 can be received more quickly and efficiently, and the corresponding first energy storage device 32 can be ensured to have sufficient storage space; when the capacity of the renewable energy power generation subsystem 31 is too low, the uniquely corresponding first energy storage device 32 discharges, and the uniquely corresponding renewable energy power generation subsystem 31 can be more quickly and efficiently provided with electric power support.
Further, the independent power supply device 10 is at least one of an internal combustion generator, a mechanical power supply apparatus, and a chemical power supply apparatus. When the independent power supply device 10 is a chemical battery, the microgrid monitoring and stabilizing device 40 further comprises an SVG42, the SVG42 is a reactive power compensation device, and the SVG42 is connected to the bus M and used for receiving a control command of the general control device 20 to compensate the reactive power of the energy storage type microgrid 1.
Further, the master control device 20 may adjust the output voltage of the independent power supply device 10 first and then adjust the priority order of the SVG42 to adjust the voltage inside the energy storage type microgrid 1 according to the voltage obtained by the monitoring device of the microgrid monitoring and stabilizing device 40. When the output voltage of the independent power supply device 10 is not enough to increase the voltage, reactive power is output through the SVG42 to compensate the voltage inside the energy storage type micro-grid 1, so that the power quality of the energy storage type micro-grid 1 is optimized by improving the voltage quality.
Further, the microgrid monitoring and stabilizing device 40 further comprises a load adjusting device 43, and the load adjusting device 43 is connected to the bus M and is used for receiving a command sent by the master control device 20 to adjust the load.
The general control device 20 is used for: when the frequency parameter of the energy storage type microgrid 1 is smaller than a preset first frequency parameter threshold value, the frequency parameter is increased in a priority order of firstly controlling the load adjusting device 43 to reduce the load, then controlling the first energy storage device 32 and the second energy storage device 41 to discharge, and finally controlling the independent power supply device 10 to increase the electric energy output. Exemplarily, the first frequency parameter threshold may be 49.8Hz, the load adjusting device 43 is first controlled to reduce the load amount in the energy storage type microgrid 1, so as to increase the frequency in a manner of reducing the load, if the load is reduced to the preset load threshold, the frequency is still less than 49.8Hz, the first energy storage device 32 and the second energy storage device 41 may be controlled to discharge, and if the frequency is still less than 49.8Hz after the first energy storage device 32 and the second energy storage device 41 discharge to the preset discharge threshold, the independent power supply device 10 is controlled to increase the power output so as to increase the frequency. The priority adjustment sequence can effectively ensure the effective utilization of the reserve energy, avoid the excessive station load from consuming the reserve energy, generally ensure the non-renewable energy of the independent power supply device 10, and avoid the consumption of the energy of the independent power supply device 10 as much as possible.
When the frequency parameter is greater than the preset second frequency parameter, the frequency parameter is decreased in the order of priority of first charging the first energy storage device 32 and the second energy storage device 41, then controlling the independent power supply device 10 to decrease the power output, and finally controlling the load adjusting device 43 to increase the load. Exemplarily, the second frequency parameter threshold may be 50.2Hz, when the frequency is greater than 50.2Hz, the first energy storage device 32 and the second energy storage device 41 are charged according to the principle of energy storage first, so as to avoid energy waste, then the independent power supply device 10 is controlled to reduce the output of electric energy, and finally the load adjusting device 43 is controlled to increase the load, so that not only the frequent increase and decrease of the load in the station can be avoided, the electrical inertia inside the energy storage type microgrid 1 is ensured, but also the electric energy consumption due to excessive load can be avoided, and the effective utilization of energy is ensured.
Further, the renewable energy power generation system 30 includes at least one of a wind power generation system, a hydro power generation system, a tidal power generation system, and a photovoltaic power generation system.
Further, the first energy reserve apparatus 32 and the second energy reserve apparatus 41 include at least one of a chemical battery, a mechanical energy storage device, and a super capacitor.
Further, the renewable energy power generation subsystem 31 includes a renewable energy generator and a transformer device, the renewable energy generator is connected with the transformer device in a one-to-one manner, and the transformer device is connected to the bus M.
Further, the microgrid monitoring and stabilizing device 40 further comprises a filtering device 44, and the filtering device 44 is connected to a power generation outlet of the renewable energy generator and is used for filtering out harmonic waves generated by a converter of the renewable energy generator. Exemplarily, as shown in fig. 2, the filtering device 44 includes a first active filter R1 and a second active filter R2, the first active filter R1 is connected to the power generation outlet of the first renewable energy generator for filtering the harmonic generated by the converter of the first renewable energy generator, and the second active filter R2 is connected to the power generation outlet of the second renewable energy generator for filtering the harmonic generated by the converter of the second renewable energy generator.
Exemplarily, the first transforming device F1 and the second transforming device F2 may step down the bus M voltage 35kV to 690V for use by the first renewable energy generator G1 and the second renewable energy generator G2; the 690V may also be boosted to bus M voltage 35kV to transfer power with bus M. The third transforming device F3 can boost the 400V output by the independent power supply 10 to the voltage of the bus M of 35kV to transmit electric energy by using the bus M. The fourth transformer F4 steps down the bus M voltage of 35kV to 110V for use by the main grid 50.
Example 3
Referring to fig. 2, the energy storage type microgrid 1 further comprises a main grid interface K1 for connecting with the main grid 50, and the independent power supply device 10 is disconnected from the renewable energy power generation system 30 when the energy storage type microgrid 1 is connected to the main grid 50.
After the energy storage type microgrid 1 is incorporated into the main grid 50, the microgrid monitoring and stabilizing device 40 responds in real time in an agc (automatic Generation control) mode. The renewable energy power generation subsystem 31 and the first energy storage device 32 are independent from each other and communicate with each other, and the master control device 20 issues an instruction to the renewable energy power generation subsystem 31 and the first energy storage device 32 according to the frequency acquired by the microgrid monitoring and stabilizing device 40, so that real-time charging and discharging control is realized, load change on the balanced demand side is realized, the frequency is further maintained stable, and the control frequency is within a standard range.
The first energy reserve 32 and the renewable energy generation subsystem 31 are slow in frequency regulation and cannot cope with the pulsating component and the continuous component of small fluctuation and slow output. The second energy storage device 41 can realize real-time adjustment of the frequency in the power grid, can solve the problem of random active imbalance in the regional power grid with a short time of the second or minute level, and has the advantages of high adjustment speed and high adjustment precision of the second energy storage device 41 and can frequently switch the power adjustment direction.
Exemplarily, the frequency modulation comprehensive index K is 0.25 × (2K1+ K2+ K3), where K1 is measured speed of the generator in the renewable energy power generation subsystem 31/average adjustment speed of the generators in all the renewable energy power generation subsystems 31 in the control area, K2 is 1-response delay time/5 min of the generator in the renewable energy power generation subsystem 31, and K3 is 1-adjustment error of the generator in the renewable energy power generation subsystem 31/adjustment allowable error of the generator in the renewable energy power generation subsystem 31. Exemplarily, K1 is 5 at the most, K2, K3 are 1 at the most, so the value of the composite index K is 3 at the most. The K value of a general coal-fired unit is between 0.6 and 0.9, and the K value of a wind turbine unit is about 0.9 due to the existence of a converter. The first energy storage device 32 and the second energy storage device 41 can improve the performance K value of the generator in each renewable energy power generation subsystem 31, and prolong the service life of the generator.
In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above-described embodiments are merely illustrative of several embodiments of the present invention, which are described in detail and specific, but not intended to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (10)
1. The energy storage type microgrid is characterized in that the energy storage type microgrid supplies power to a main power grid when being connected into the main power grid for operation and operates in an isolated island mode when being disconnected from the main power grid, and the energy storage type microgrid comprises a renewable energy power generation system, a microgrid monitoring and stabilizing device and an independent power supply device;
the renewable energy power generation system, the micro-grid monitoring and stabilizing device and the independent power supply device are connected to a bus;
the renewable energy power generation system comprises a plurality of renewable energy power generation subsystems and a plurality of first energy storage devices, each first energy storage device is connected with at least one renewable energy power generation subsystem, and the first energy storage devices are used for storing electric energy of the corresponding connected renewable energy power generation subsystems or providing electric power for the corresponding connected renewable energy power generation subsystems;
the microgrid monitoring and stabilizing device comprises a monitoring device and a second energy storage device, wherein the monitoring device is used for acquiring electrical parameters of the energy storage type microgrid, and the second energy storage device is connected to the bus and is used for receiving electric energy through the bus or providing electric power for a load connected to the bus;
the independent power supply device is used for supplying power to the energy storage type micro-grid when the independent power supply device is separated from a main grid.
2. The energy storage type microgrid of claim 1, wherein the number of the renewable energy power generation subsystems is the same as that of the first energy storage devices, and each renewable energy power generation subsystem is correspondingly connected with one first energy storage device.
3. The energy storage microgrid of claim 1, wherein the independent power supply device is at least one of an internal combustion generator, a mechanical power supply device and a chemical power supply device.
4. The energy-storing microgrid of claim 1, wherein the renewable energy power generation system comprises at least one of a wind power generation system, a hydroelectric power generation system, a tidal power generation system, and a photovoltaic power generation system.
5. The energy-storing microgrid of claim 1, wherein the first energy storage device and the second energy storage device comprise at least one of a chemical battery, a mechanical energy storage device, and a supercapacitor.
6. The energy-storage microgrid of claim 1, characterized in that the microgrid monitoring and stabilizing device further comprises an SVG connected to the bus for receiving control instructions of a general control device to compensate for the reactive power of the energy-storage microgrid.
7. The energy storage type microgrid of claim 1, wherein the microgrid monitoring and stabilizing device further comprises a load adjusting device, and the load adjusting device is connected to the bus and used for receiving a command sent by the master control device to adjust a load.
8. The energy-storing microgrid of claim 1, wherein the renewable energy power generation subsystem comprises a renewable energy generator and a voltage transformation device, the renewable energy generator is connected with the voltage transformation device in a one-to-one manner, and the voltage transformation device is connected to the bus.
9. The energy storage microgrid of claim 8, wherein the microgrid monitoring and stabilizing device further comprises a filtering device, and the filtering device is connected with a power generation outlet of the renewable energy generator.
10. The energy storage microgrid of any one of claims 1 to 9, further comprising a main grid interface for connecting the main grid, wherein the independent power supply device is disconnected from the renewable energy power generation system when the energy storage microgrid is connected to the main grid.
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