A flexible control method and system for microgrid distribution areas based on shared energy storage

Abstract

This invention discloses a flexible control method and system for microgrid distribution areas based on shared energy storage. The method includes: acquiring the increased or supporting power of distributed renewable energy sources; detecting the absorbable / supportable power of energy storage in the medium- and low-voltage microgrid distribution area; and configuring the absorption / support mode of distributed renewable energy power according to a pre-constructed closed-loop operation channel and the absorbable / supportable power, thereby regulating the operation of the medium- and low-voltage microgrid. The method also involves real-time monitoring of the end voltage of the microgrid distribution area through an energy management device, detecting the node line where the end voltage is located through an optimal path, and providing capacitive reactive power support or inductive reactive power consumption through the nearest energy storage. By acquiring information on distributed renewable energy sources and detecting the energy storage capacity of the medium- and low-voltage microgrid distribution area, and configuring a reasonable absorption and support mode for distributed renewable energy power, the method achieves load balancing and voltage optimization control of the medium- and low-voltage microgrid distribution area.

Description

Technical Field

[0001] This invention belongs to the field of medium and low voltage distribution area energy storage control technology, specifically relating to a flexible control method and system for microgrid distribution areas based on shared energy storage. Background Technology

[0002] With the rapid development of new energy power generation technologies, low- and medium-voltage distribution areas require a large amount of electrical energy. Moreover, with the accelerated growth of load, problems such as overload in these areas are intensifying. They are now facing significant challenges in many aspects, including customized and diversified electricity demand, large-scale integration of distributed power sources, and increasingly complex power flow coordination and control. Furthermore, energy storage in new energy distribution networks at different distribution network endpoints places higher demands on grid quality and power supply reliability.

[0003] Currently, medium and low voltage distribution networks mainly use conventional switching and traditional control methods, and rely heavily on human intervention in energy regulation of medium and low voltage power grids. This can easily have a negative impact on the safe operation of smart distribution networks, and also result in low utilization rates of energy storage resources and poor overall benefits in each distribution area. Summary of the Invention

[0004] This invention proposes a flexible control method and system for microgrid distribution areas based on shared energy storage. By reducing human intervention through flexible control and shared energy storage, it improves the resource utilization rate of energy storage in medium and low voltage distribution networks and the operational stability of the system, thereby achieving load balancing.

[0005] A first aspect of the present invention provides a flexible control method for microgrid distribution areas based on shared energy storage, the method comprising:

[0006] The system acquires the increased power of distributed renewable energy sources, detects the absorbable power of energy storage in medium- and low-voltage microgrid areas, and configures the absorption method of distributed renewable energy power based on a pre-constructed closed-loop operation channel and the absorbable power. The closed-loop operation channel is constructed between different medium- and low-voltage microgrid areas based on the ports of multiple medium- and low-voltage microgrid areas and multi-port energy routers.

[0007] Obtain the supporting power of distributed renewable energy, detect the supporting power of energy storage in medium and low voltage microgrid areas, and configure the supporting mode of distributed renewable energy power according to the closed-loop operation channel and the supporting power.

[0008] The operation of medium and low voltage microgrids is regulated according to the absorption and support methods of distributed renewable energy power.

[0009] The above scheme, through a closed-loop operation channel, uses information on the acquired distributed renewable energy power and the energy storage capacity of the medium and low voltage microgrid areas to autonomously implement reasonable methods for absorbing and supporting distributed renewable energy power. This reduces human intervention during the operation of the medium and low voltage microgrid, while simultaneously achieving load balancing in the medium and low voltage microgrid areas and improving operational stability.

[0010] In one possible implementation of the first aspect, the increased power of distributed renewable energy is obtained, the absorbable power of energy storage in the medium- and low-voltage microgrid area is detected, and the absorption method of distributed renewable energy power is configured according to the pre-constructed closed-loop operation channel and the absorbable power, specifically as follows:

[0011] The increased power of distributed new energy sources is obtained through the energy management device of the first medium-low voltage microgrid area; wherein, the energy management device can control the energy allocation of the corresponding medium-low voltage microgrid area;

[0012] Based on the increased power, the rechargeable capacity of the energy storage in the first medium-low voltage microgrid area and the adjustable capacity of the adjustable load are detected to absorb the power.

[0013] When the absorbable power is greater than or equal to the increased power, the increased power of distributed new energy is fully absorbed through the energy storage and adjustable load of the first medium and low voltage microgrid area using the SOC balancing principle.

[0014] When the absorbable power is less than the increased power, the increased power of distributed renewable energy is mobilized using a closed-loop operation channel and absorbed through other medium and low voltage microgrid areas.

[0015] In one possible implementation of the first aspect, when the absorbable power is less than the increased power, the increased power of distributed renewable energy is mobilized using a closed-loop operation channel and absorbed through other medium- and low-voltage microgrid areas, specifically as follows:

[0016] When the absorbable power is less than the increased power, the energy storage and adjustable load of the first medium-low voltage microgrid area shall prioritize absorbing the increased power of the distributed new energy corresponding to the absorbable power; according to the energy management device of the first medium-low voltage microgrid area, a request shall be sent to other areas of the medium-low voltage microgrid group to apply for absorption of the remaining increased power of the distributed new energy.

[0017] When the power that can be absorbed by the energy storage and adjustable load of other distribution areas in the medium- and low-voltage microgrid group is greater than or equal to the increased power of the remaining distributed new energy, the medium- and low-voltage microgrid group adopts the SOC balance principle to allocate the increased power of the remaining distributed new energy to the other distribution areas with absorption capacity through a closed-loop operation channel.

[0018] Otherwise, the local low-voltage microgrid group will first absorb part of the remaining increased power from distributed renewable energy sources locally. Then, the local low-voltage microgrid group will send a request to other low-voltage microgrid groups to absorb the remaining increased power from distributed renewable energy sources. The remaining increased power from distributed renewable energy sources will be distributed to other low-voltage microgrid groups with absorption capacity through a closed-loop operation channel.

[0019] The above scheme formulates different absorption schemes based on the absorption capacity of other medium and low voltage microgrid areas, and then transports the distributed new energy power that needs to be absorbed through a closed-loop operation channel. This solves the problem of new energy management in medium and low voltage microgrid areas and reduces the overload of individual areas, thus achieving load balance and stable operation among medium and low voltage microgrid areas.

[0020] In one possible implementation of the first aspect, the supporting power of distributed renewable energy is obtained, the supportable power of energy storage in the medium- and low-voltage microgrid area is detected, and the support mode of distributed renewable energy power is configured according to the closed-loop operation channel and the supportable power, specifically as follows:

[0021] The supporting power of distributed new energy sources is obtained according to the energy management device of the first medium-low voltage microgrid area; wherein, the energy management device can control the energy allocation of the corresponding medium-low voltage microgrid area;

[0022] Based on the supported power, the discharge capacity of the energy storage in the first medium-low voltage microgrid area and the adjustable capacity of the adjustable load are detected to determine the supported power.

[0023] When the supportable power is greater than or equal to the support power, the support power of distributed new energy will be fully met by the energy storage and adjustable load of the first medium and low voltage microgrid area.

[0024] When the available power is less than the supporting power, the supporting power of distributed new energy sources is mobilized through a closed-loop operation channel to meet the support requirements through other medium and low voltage microgrid areas.

[0025] In one possible implementation of the first aspect, when the supportable power is less than the supporting power, the supporting power of distributed renewable energy is mobilized using a closed-loop operation channel, and the support demand is met through other medium- and low-voltage microgrid areas, specifically as follows:

[0026] When the available power is less than the supporting power, the energy storage and adjustable load of the first medium-low voltage microgrid area shall prioritize supporting the supporting power of the distributed new energy corresponding to the available power; according to the energy management device of the first medium-low voltage microgrid area, a request shall be sent to other areas of the medium-low voltage microgrid group to apply for supporting the remaining distributed new energy.

[0027] When the power that can be supported by the energy storage and adjustable load of other distribution areas in the medium- and low-voltage microgrid group is less than the supporting power of the remaining distributed new energy, the medium- and low-voltage microgrid group will allocate the supporting power of the remaining distributed new energy to the other distribution areas with supporting capabilities through a closed-loop operation channel.

[0028] Otherwise, the local low-voltage microgrid group will prioritize supporting the remaining distributed renewable energy power, and then send a request to the local low-voltage microgrid group to request the remaining distributed renewable energy power to be supplied. The remaining distributed renewable energy power will then be distributed to other low-voltage microgrid groups with the capacity to provide support through a closed-loop operation channel.

[0029] The above scheme formulates different support schemes based on the support capabilities of distributed new energy sources in other medium and low voltage microgrid areas. Then, the required distributed new energy power is transported through a closed-loop operation channel, which solves the management of new energy sources in medium and low voltage microgrid areas and the mutual energy support between groups, and realizes load balancing and stable operation among medium and low voltage microgrid areas.

[0030] In one possible implementation of the first aspect, the operation of the medium- and low-voltage microgrid is regulated according to the absorption and support methods of distributed renewable energy power, specifically as follows:

[0031] Based on the absorption and support methods of distributed renewable energy power in medium and low voltage microgrid areas, the power of distributed renewable energy is allocated among multiple medium and low voltage microgrid areas through a closed-loop operation channel, and the distributed renewable energy is shared between microgrids and microgrid groups to control the load balance of medium and low voltage microgrid operation.

[0032] A second aspect of the present invention provides a flexible control system for microgrid distribution areas based on shared energy storage, the system comprising: a power absorption module, a power support module, and a system control module;

[0033] The power absorption module is used to acquire the increased power of distributed new energy sources, detect the absorbable power of energy storage in medium and low voltage microgrid areas, and configure the power absorption method of distributed new energy sources based on the pre-constructed closed-loop operation channel and the absorbable power. The closed-loop operation channel is constructed between different medium and low voltage microgrid areas based on the ports of multiple medium and low voltage microgrid areas and multi-port energy routers.

[0034] The power support module is used to obtain the supporting power of distributed new energy sources, detect the supportable power of energy storage in medium and low voltage microgrid areas, and configure the power support mode of distributed new energy sources according to the closed-loop operation channel and the supportable power.

[0035] The system control module is used to regulate the operation of the medium and low voltage microgrid according to the absorption and support methods of distributed new energy power.

[0036] In one possible implementation of the second aspect, the power absorption module includes: a data acquisition unit and a power absorption mode configuration unit;

[0037] The data acquisition unit is used to acquire the increased power of distributed new energy sources according to the energy management device of the first medium-low voltage microgrid area; wherein the energy management device can control the energy allocation of the corresponding medium-low voltage microgrid area; and according to the increased power, detect the rechargeable capacity of the energy storage and the adjustable capacity of the adjustable load of the first medium-low voltage microgrid area and the power that can be absorbed.

[0038] The configuration absorption method unit is used to fully absorb the increased power of distributed new energy through energy storage and adjustable loads in the first medium-low voltage microgrid area when the absorbable power is greater than or equal to the increased power, using the SOC balancing principle; when the absorbable power is less than the increased power, the unit uses a closed-loop operation channel to mobilize the increased power of distributed new energy and absorb it through other medium-low voltage microgrid areas.

[0039] In one possible implementation of the second aspect, when the absorbable power is less than the increased power, the increased power of distributed renewable energy is mobilized using a closed-loop operation channel and absorbed through other medium- and low-voltage microgrid areas, specifically as follows:

[0040] When the absorbable power is less than the increased power, the energy storage and adjustable load of the first medium-low voltage microgrid area shall prioritize absorbing the increased power of the distributed new energy corresponding to the absorbable power; according to the energy management device of the first medium-low voltage microgrid area, a request shall be sent to other areas of the medium-low voltage microgrid group to apply for absorption of the remaining increased power of the distributed new energy.

[0041] When the power that can be absorbed by the energy storage and adjustable load of other distribution areas in the medium- and low-voltage microgrid group is greater than or equal to the increased power of the remaining distributed new energy, the medium- and low-voltage microgrid group adopts the SOC balance principle to allocate the increased power of the remaining distributed new energy to the other distribution areas with absorption capacity through a closed-loop operation channel.

[0042] Otherwise, the local low-voltage microgrid group will first absorb part of the remaining increased power from distributed renewable energy sources locally. Then, the local low-voltage microgrid group will send a request to other low-voltage microgrid groups to absorb the remaining increased power from distributed renewable energy sources. The remaining increased power from distributed renewable energy sources will be distributed to other low-voltage microgrid groups with absorption capacity through a closed-loop operation channel.

[0043] In one possible implementation of the second aspect, the system control module includes: a data acquisition unit and a configuration support unit;

[0044] The data acquisition unit is used to acquire the supporting power of distributed new energy sources according to the energy management device of the first medium-low voltage microgrid area; wherein the energy management device can control the energy allocation of the corresponding medium-low voltage microgrid area; and according to the supporting power, detect the discharge capacity of the energy storage and the adjustable capacity of the adjustable load of the first medium-low voltage microgrid area to support the power.

[0045] The configuration support unit is used to fully meet the support requirements by using the energy storage and adjustable load of the first medium-low voltage microgrid area when the supportable power is greater than or equal to the support power; when the supportable power is less than the support power, the unit uses a closed-loop operation channel to mobilize the support power of the distributed new energy and meet the support requirements through other medium-low voltage microgrid areas.

[0046] In one possible implementation of the second aspect, when the available power is less than the supporting power, the supporting power of distributed renewable energy is mobilized using a closed-loop operation channel, and the supporting demand is met through other medium- and low-voltage microgrid areas. Specifically:

[0047] When the available power is less than the supporting power, the energy storage and adjustable load of the first medium-low voltage microgrid area shall prioritize supporting the supporting power of the distributed new energy corresponding to the available power; according to the energy management device of the first medium-low voltage microgrid area, a request shall be sent to other areas of the medium-low voltage microgrid group to apply for supporting the remaining distributed new energy.

[0048] When the power that can be supported by the energy storage and adjustable load of other distribution areas in the medium- and low-voltage microgrid group is less than the supporting power of the remaining distributed new energy, the medium- and low-voltage microgrid group will allocate the supporting power of the remaining distributed new energy to the other distribution areas with supporting capabilities through a closed-loop operation channel.

[0049] Otherwise, the local low-voltage microgrid group will prioritize supporting the remaining distributed renewable energy power, and then send a request to the local low-voltage microgrid group to request the remaining distributed renewable energy power to be supplied. The remaining distributed renewable energy power will then be distributed to other low-voltage microgrid groups with the capacity to provide support through a closed-loop operation channel.

[0050] In one possible implementation of the second aspect, the operation of the medium- and low-voltage microgrid is regulated according to the absorption and support methods of distributed renewable energy power, specifically as follows:

[0051] Based on the absorption and support methods of distributed renewable energy power in medium and low voltage microgrid areas, the power of distributed renewable energy is allocated among multiple medium and low voltage microgrid areas through a closed-loop operation channel, and the distributed renewable energy is shared between microgrids and microgrid groups to control the load balance of medium and low voltage microgrid operation. Attached Figure Description

[0052] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 This is a flowchart illustrating a flexible control method for microgrid distribution areas based on shared energy storage, according to a certain embodiment of the present invention.

[0054] Figure 2 This is a structural block diagram of a microgrid area flexible control system based on shared energy storage, provided by a certain embodiment of the present invention. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] It should be understood that the step numbers used in the text are for ease of description only and are not intended to limit the order in which the steps are performed.

[0057] like Figure 1 As shown, Figure 1 This invention provides a flowchart illustrating a flexible control method for microgrid distribution areas based on shared energy storage, according to a specific embodiment of the present invention. The flexible control method for microgrid distribution areas based on shared energy storage in this embodiment includes steps S1 to S3, detailed below:

[0058] Step S1: Obtain the increased power of distributed new energy sources, detect the absorbable power of energy storage in the medium and low voltage microgrid area, and configure the absorption method of distributed new energy power according to the pre-constructed closed-loop operation channel and the absorbable power.

[0059] In this step, the energy aggregation management device of the first medium-low voltage microgrid area first aims at the power balance of the area. Based on the "source-load" characteristic analysis, it monitors the increase in power and load changes of distributed new energy sources in real time through distributed power sources, typical load curves, distributed power sources and load forecasts, that is, the changes in current and voltage of the first medium-low voltage microgrid area. When backflow is detected, excessive line voltage or excessive distribution index, it indicates that the increase in power of distributed new energy sources is too large, and it is necessary to arrange a reasonable absorption method to reduce the operation of the first medium-low voltage microgrid area.

[0060] Then, based on the increased power, the energy management device of the first medium-low voltage microgrid area detects the rechargeable capacity of the energy storage and the adjustable capacity of the adjustable load in the first medium-low voltage microgrid area, and the power that can be absorbed. When the absorbable power is greater than or equal to the increased power, the SOC balancing principle is adopted to completely absorb the increased power of the distributed new energy through the energy storage and adjustable load of the first medium-low voltage microgrid area. The energy management device can control the energy allocation of the corresponding medium-low voltage microgrid area, corresponding to the energy storage and adjustable load in the microgrid. The SOC balancing principle is charge balancing, which is a principle used to maintain the balance of remaining electrical energy. When the absorbable power is less than the increased power, the increased power is first partially absorbed locally, and then the remaining increased power of the distributed new energy is mobilized through a closed-loop operation channel to be absorbed through other medium-low voltage microgrid areas. The closed-loop operation channel is constructed between different medium-low voltage microgrid areas based on the ports of multiple medium-low voltage microgrid areas and multi-port energy routers.

[0061] In some embodiments, step S1 includes:

[0062] When the absorbable power is less than the increased power, the energy storage and adjustable load of the first medium- and low-voltage microgrid area prioritize absorbing the increased power of the distributed renewable energy corresponding to the absorbable power. Then, the energy management device of the first medium- and low-voltage microgrid area calculates the remaining increased power of the distributed renewable energy that cannot be absorbed locally. Based on the remaining increased power of the distributed renewable energy, it sends a request to the microgrid area group to request inter-group mutual assistance to absorb the excess power. If the request is responded to, the remaining increased power of the distributed renewable energy will be transmitted to other medium- and low-voltage microgrid areas with absorption capacity through a closed-loop operation channel. The microgrid area group includes multiple medium- and low-voltage microgrid areas, and energy sharing can be carried out within the microgrid area group through a closed-loop operation channel. Energy sharing can also be carried out between multiple microgrid area groups through a closed-loop operation channel.

[0063] When the power that can be absorbed by the energy storage and adjustable load of other distribution areas in the medium- and low-voltage microgrid group is greater than or equal to the additional power of the remaining distributed new energy, the medium- and low-voltage microgrid group adopts the SOC balancing principle to allocate the additional power of the remaining distributed new energy to the other distribution areas with absorption capacity through a closed-loop operation channel, so as to achieve complete local absorption within the microgrid distribution area group.

[0064] Otherwise, the local low-voltage microgrid group will prioritize absorbing some of the remaining increased power from distributed renewable energy sources locally. Then, the energy management device will calculate the remaining increased power from distributed renewable energy sources and simultaneously send requests to other microgrid groups to request mutual assistance in absorbing the remaining increased power from distributed renewable energy sources. After receiving the requests, other microgrid groups will first calculate the absorption capacity of other low-voltage microgrid groups within their respective groups. Low-voltage microgrid groups with absorption capacity will obtain the remaining increased power from distributed renewable energy sources through a closed-loop operation channel, thus realizing resource sharing among microgrid groups.

[0065] S2, obtain the supporting power of distributed new energy, detect the supporting power of energy storage in the medium and low voltage microgrid area, and configure the supporting mode of distributed new energy power according to the closed-loop operation channel and the supporting power.

[0066] In this step, the energy aggregation management device of the first medium-low voltage microgrid area first detects the voltage at the end of the power grid feeder in the first medium-low voltage microgrid area in real time. When the end voltage is low, it detects the node line where the end voltage is located through the optimal path and provides capacitive reactive power support through the nearest energy storage, thereby improving the end voltage and power quality. When the end voltage is high, it detects the node line where the end voltage is located through the optimal path and provides inductive reactive power consumption through the nearest energy storage, thereby reducing the end voltage and improving power quality. If the nearest energy storage cannot provide capacitive support, it is necessary to mobilize the energy storage of the medium-low voltage microgrid area and other medium-low voltage microgrid areas to complete the support. The energy aggregation management device controls the line voltage based on the distflow power flow model, which describes the physical power flow law of the power grid, thereby constructing the online optimal power flow model of the power grid.

[0067] Then, based on the energy management device of the first medium-low voltage microgrid area, the supporting power of distributed new energy is obtained, the discharge capacity of the energy storage and the adjustable capacity of the adjustable load in the first medium-low voltage microgrid area are detected, and the supporting mode of distributed new energy power is configured.

[0068] When the available power is greater than or equal to the supporting power, the supporting power of distributed new energy is fully met by energy storage and adjustable load in the first medium- and low-voltage microgrid area; when the available power is less than the supporting power, the supporting power of distributed new energy is mobilized by a closed-loop operation channel and the supporting demand is met by other medium- and low-voltage microgrid areas.

[0069] In some embodiments, step S2 includes:

[0070] When the available power is less than the supporting power, the energy storage and adjustable load of the first medium-low voltage microgrid area shall prioritize supporting the supporting power of the distributed new energy corresponding to the available power. If the energy storage discharge cannot meet the support, priority support within the first medium-low voltage microgrid area can be achieved by reducing the power consumption of the adjustable load. According to the energy management device of the first medium-low voltage microgrid area, a request is sent to other areas of the medium-low voltage microgrid group to apply for support of the remaining distributed new energy.

[0071] Upon receiving a request, the local low-voltage microgrid group first uses its energy management device to detect the support capacity of energy storage and adjustable loads in other distribution areas. If the support capacity of energy storage and adjustable loads in other distribution areas of the local low-voltage microgrid group is less than the support capacity of the remaining distributed renewable energy, the local low-voltage microgrid group allocates the remaining support capacity of the distributed renewable energy to the other distribution areas with support capabilities through a closed-loop operation channel. Otherwise, the local low-voltage microgrid group prioritizes supporting a portion of the remaining support capacity of the distributed renewable energy, and then sends a request to the local low-voltage microgrid group to request the fulfillment of the remaining support capacity of the distributed renewable energy, allocating the remaining support capacity of the distributed renewable energy to other low-voltage microgrid groups with support capabilities through a closed-loop operation channel.

[0072] S3 regulates the operation of medium and low voltage microgrids based on the consumption and support methods of distributed renewable energy power;

[0073] In this step, based on the absorption and support methods of distributed renewable energy power in medium- and low-voltage microgrid areas, the power of distributed renewable energy is allocated among multiple medium- and low-voltage microgrid areas through a closed-loop operation channel, so that distributed renewable energy can be shared between microgrids and microgrid groups, and the operation of medium- and low-voltage microgrids can be controlled to achieve load balancing.

[0074] Furthermore, in order to implement the microgrid area flexible control system based on shared energy storage corresponding to the above method embodiments, and to achieve the corresponding functional and technical effects, Figure 2A structural block diagram of a flexible control system for a microgrid distribution area based on shared energy storage is provided. For ease of explanation, only the parts relevant to this embodiment are shown. The flexible control system for a microgrid distribution area based on shared energy storage provided in this embodiment of the invention includes:

[0075] The power absorption module 201 is used to acquire the increased power of distributed new energy sources, detect the absorbable power of energy storage in medium and low voltage microgrid areas, and configure the power absorption method of distributed new energy sources according to the pre-constructed closed-loop operation channel and the absorbable power; wherein, the closed-loop operation channel is constructed between different medium and low voltage microgrid areas based on the ports of multiple medium and low voltage microgrid areas and multi-port energy routers;

[0076] The power support module 202 is used to obtain the supporting power of distributed new energy sources, detect the supportable power of energy storage in medium and low voltage microgrid areas, and configure the power support mode of distributed new energy sources according to the closed-loop operation channel and the supportable power.

[0077] The system control module 203 is used to regulate the operation of the medium and low voltage microgrid according to the absorption and support methods of distributed renewable energy power.

[0078] In some embodiments, the power absorption module 201 includes:

[0079] The data acquisition unit is used to acquire the increased power of distributed new energy sources according to the energy management device of the first medium-low voltage microgrid area; wherein, the energy management device can control the energy allocation of the corresponding medium-low voltage microgrid area; and according to the increased power, detect the rechargeable capacity of the energy storage and the adjustable capacity of the adjustable load of the first medium-low voltage microgrid area and the power that can be absorbed.

[0080] A power absorption mode unit is configured to, when the absorbable power is greater than or equal to the increased power, use the SOC balancing principle to fully absorb the increased power of distributed new energy through the energy storage and adjustable load of the first medium- and low-voltage microgrid area; when the absorbable power is less than the increased power, use a closed-loop operation channel to mobilize the increased power of distributed new energy and absorb it through other medium- and low-voltage microgrid areas.

[0081] In some embodiments, the data acquisition unit is specifically used for:

[0082] The energy aggregation management device in the first medium-low voltage microgrid area first aims at balancing the power supply in the area. Based on the "source-load" characteristic analysis, it monitors the increase in power and load changes of distributed renewable energy sources in real time through distributed power sources, typical load curves, distributed power sources, and load forecasts. This is reflected in the current and voltage changes of the first medium-low voltage microgrid area. When backflow, excessive line voltage, or excessive distribution indicators are detected, it indicates that the increase in power from distributed renewable energy sources is too large, and a reasonable absorption method needs to be arranged to alleviate the operation of the first medium-low voltage microgrid area. Then, based on the increased power, the energy management device in the first medium-low voltage microgrid area detects the rechargeable capacity of the energy storage and the adjustable capacity of the adjustable load in the first medium-low voltage microgrid area to determine the power that can be absorbed.

[0083] In some embodiments, the configuration and absorption method unit is specifically used for:

[0084] When the absorbable power is greater than or equal to the increased power, the increased power of distributed new energy is completely absorbed locally through energy storage and adjustable loads in the first medium- and low-voltage microgrid area using the SOC balancing principle; wherein, the energy management device can control the energy allocation of the corresponding medium- and low-voltage microgrid area, corresponding to the energy storage and adjustable loads in the microgrid; wherein, the SOC balancing principle is charge balancing, which is a principle used to maintain the balance of remaining electrical energy.

[0085] When the absorbable power is less than the increased power, the energy storage and adjustable load of the first medium- and low-voltage microgrid area prioritize absorbing the increased power of the distributed renewable energy corresponding to the absorbable power. Then, the energy management device of the first medium- and low-voltage microgrid area calculates the remaining increased power of the distributed renewable energy that cannot be absorbed locally. Based on the remaining increased power of the distributed renewable energy, it sends a request to the microgrid area group to request inter-group mutual assistance to absorb the excess power. If the request is responded to, the remaining increased power of the distributed renewable energy will be transmitted to other medium- and low-voltage microgrid areas with absorption capacity through a closed-loop operation channel. The microgrid area group includes multiple medium- and low-voltage microgrid areas, and energy sharing can be carried out within the microgrid area group through a closed-loop operation channel. Energy sharing can also be carried out between multiple microgrid area groups through a closed-loop operation channel.

[0086] When the power that can be absorbed by the energy storage and adjustable load of other distribution areas in the medium- and low-voltage microgrid group is greater than or equal to the additional power of the remaining distributed new energy, the medium- and low-voltage microgrid group adopts the SOC balancing principle to allocate the additional power of the remaining distributed new energy to the other distribution areas with absorption capacity through a closed-loop operation channel, so as to achieve complete local absorption within the microgrid distribution area group.

[0087] Otherwise, the local low-voltage microgrid group will prioritize absorbing some of the remaining increased power from distributed renewable energy sources locally. Then, the energy management device will calculate the remaining increased power from distributed renewable energy sources and simultaneously send requests to other microgrid groups to request mutual assistance in absorbing the remaining increased power from distributed renewable energy sources. After receiving the requests, other microgrid groups will first calculate the absorption capacity of other low-voltage microgrid groups within their respective groups. Low-voltage microgrid groups with absorption capacity will obtain the remaining increased power from distributed renewable energy sources through a closed-loop operation channel, thus realizing resource sharing among microgrid groups.

[0088] In some embodiments, the power support module 202 includes:

[0089] The data acquisition unit is used to acquire the supporting power of distributed new energy sources according to the energy management device of the first medium-low voltage microgrid area; wherein, the energy management device can control the energy allocation of the corresponding medium-low voltage microgrid area; and according to the supporting power, detect the discharge capacity of the energy storage and the adjustable capacity of the adjustable load of the first medium-low voltage microgrid area to support the power.

[0090] The configuration support mode unit is used to fully meet the support requirements by using the support power of distributed new energy sources through energy storage and adjustable loads in the first medium- and low-voltage microgrid area when the supportable power is greater than or equal to the support power; when the supportable power is less than the support power, the support power of distributed new energy sources is mobilized through a closed-loop operation channel to meet the support requirements through other medium- and low-voltage microgrid areas.

[0091] In some embodiments, the data acquisition unit is specifically used for:

[0092] The energy aggregation management device in the first medium- and low-voltage microgrid area first monitors the voltage at the end of the grid feeder in real time. When the voltage is low, it detects the node where the voltage is located through the optimal path and provides capacitive reactive power support through the nearest energy storage, thereby improving the voltage and power quality. When the voltage is high, it detects the node where the voltage is located through the optimal path and provides inductive reactive power consumption through the nearest energy storage, thereby reducing the voltage and improving power quality. If the nearest energy storage cannot provide capacitive support, it is necessary to mobilize the energy storage of the medium- and low-voltage microgrid area and other medium- and low-voltage microgrid areas to complete the support. The energy aggregation management device controls the line voltage based on the distflow power flow model, which describes the physical power flow law of the power grid, and constructs an online optimal power flow model for the power grid.

[0093] Then, the supporting power of distributed new energy is obtained from the energy management device of the first medium-low voltage microgrid area, and the discharge capacity of the energy storage and the adjustable capacity of the adjustable load in the first medium-low voltage microgrid area are detected to determine the supporting power.

[0094] In some embodiments, the configuration support method unit is specifically used for:

[0095] When the supportable power is greater than or equal to the support power, the support power of distributed new energy will be fully met by the energy storage and adjustable load of the first medium and low voltage microgrid area.

[0096] When the available power is less than the supporting power, the energy storage and adjustable load of the first medium-low voltage microgrid area shall prioritize supporting the supporting power of the distributed new energy corresponding to the available power. If the energy storage discharge cannot meet the support, priority support within the first medium-low voltage microgrid area can be achieved by reducing the power consumption of the adjustable load. According to the energy management device of the first medium-low voltage microgrid area, a request is sent to other areas of the medium-low voltage microgrid group to apply for support of the remaining distributed new energy.

[0097] Upon receiving a request, the local low-voltage microgrid group first uses its energy management device to detect the support capacity of energy storage and adjustable loads in other distribution areas. If the support capacity of energy storage and adjustable loads in other distribution areas of the local low-voltage microgrid group is less than the support capacity of the remaining distributed renewable energy, the local low-voltage microgrid group allocates the remaining support capacity of the distributed renewable energy to the other distribution areas with support capabilities through a closed-loop operation channel. Otherwise, the local low-voltage microgrid group prioritizes supporting a portion of the remaining support capacity of the distributed renewable energy, and then sends a request to the local low-voltage microgrid group to request the fulfillment of the remaining support capacity of the distributed renewable energy, allocating the remaining support capacity of the distributed renewable energy to other low-voltage microgrid groups with support capabilities through a closed-loop operation channel.

[0098] This embodiment proposes a flexible control method and system for microgrid distribution areas based on shared energy storage: It acquires the increased power of distributed renewable energy sources, detects the absorbable power of energy storage in the medium- and low-voltage microgrid distribution area, and configures the absorption mode of distributed renewable energy power according to a pre-constructed closed-loop operation channel and the absorbable power; it acquires the supporting power of distributed renewable energy sources, detects the supportable power of energy storage in the medium- and low-voltage microgrid distribution area, and configures the support mode of distributed renewable energy power according to the closed-loop operation channel and the support mode; and it regulates the operation of the medium- and low-voltage microgrid according to the absorption mode and support mode of distributed renewable energy power. Its beneficial effects are: by reducing human intervention through flexible control and shared energy storage, it improves the resource utilization rate of energy storage in medium- and low-voltage distribution networks and the operational stability of the system, achieving load balancing.

[0099] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention in detail. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A flexible control method for microgrid distribution areas based on shared energy storage, characterized in that, include: The process involves acquiring the increased power of distributed renewable energy sources, detecting the absorbable power of energy storage in the medium- and low-voltage microgrid area, and configuring the power absorption method of distributed renewable energy sources based on a pre-constructed closed-loop operation channel and the absorbable power. Specifically, this involves: acquiring the increased power of distributed renewable energy sources through the energy management device of the first medium- and low-voltage microgrid area; wherein the energy management device can control the energy allocation of the corresponding medium- and low-voltage microgrid area; and detecting the absorbable capacity of the rechargeable energy storage and the adjustable capacity of the adjustable load in the first medium- and low-voltage microgrid area based on the increased power. The power is determined by the following: When the absorbable power is greater than or equal to the increased power, the increased power of the distributed new energy is fully absorbed through energy storage and adjustable loads in the first medium-low voltage microgrid area using the SOC balancing principle; when the absorbable power is less than the increased power, the increased power of the distributed new energy is mobilized through a closed-loop operation channel and absorbed through other medium-low voltage microgrid areas; wherein, the closed-loop operation channel is constructed between different medium-low voltage microgrid areas based on the ports of multiple medium-low voltage microgrid areas and multi-port energy routers; Obtain the supporting power of distributed renewable energy, detect the supporting power of energy storage in medium and low voltage microgrid areas, and configure the supporting mode of distributed renewable energy power according to the closed-loop operation channel and the supporting power. The energy management device monitors the terminal voltage of the power grid feeder in the first medium-low voltage microgrid area in real time. When the terminal voltage is low, it detects the node line where the terminal voltage is located through the optimal path and provides capacitive reactive power support through the nearest energy storage. When the terminal voltage is high, it detects the node line where the terminal voltage is located through the optimal path and provides inductive reactive power consumption through the nearest energy storage. The operation of medium and low voltage microgrids is regulated according to the absorption and support methods of distributed renewable energy power.

2. The flexible control method for microgrid distribution areas based on shared energy storage according to claim 1, characterized in that, When the absorbable power is less than the increased power, the increased power of distributed renewable energy is mobilized using a closed-loop operation channel and absorbed through other medium- and low-voltage microgrid areas. Specifically: When the absorbable power is less than the increased power, the energy storage and adjustable load of the first medium-low voltage microgrid area shall prioritize absorbing the increased power of the distributed new energy corresponding to the absorbable power; according to the energy management device of the first medium-low voltage microgrid area, a request shall be sent to other areas of the medium-low voltage microgrid group to apply for absorption of the remaining increased power of the distributed new energy. When the power that can be absorbed by the energy storage and adjustable load of other distribution areas in the medium- and low-voltage microgrid group is greater than or equal to the increased power of the remaining distributed new energy, the medium- and low-voltage microgrid group adopts the SOC balance principle to allocate the increased power of the remaining distributed new energy to the other distribution areas with absorption capacity through a closed-loop operation channel. Otherwise, the local low-voltage microgrid group will first absorb part of the remaining increased power from distributed renewable energy sources locally. Then, the local low-voltage microgrid group will send a request to other low-voltage microgrid groups to absorb the remaining increased power from distributed renewable energy sources. The remaining increased power from distributed renewable energy sources will be distributed to other low-voltage microgrid groups with absorption capacity through a closed-loop operation channel.

3. The flexible control method for microgrid distribution areas based on shared energy storage according to claim 1, characterized in that, The process of obtaining the supporting power of distributed renewable energy, detecting the supportable power of energy storage in medium- and low-voltage microgrid areas, and configuring the support mode of distributed renewable energy power based on the closed-loop operation channel and the supportable power, specifically involves: The supporting power of distributed new energy sources is obtained according to the energy management device of the first medium-low voltage microgrid area; wherein, the energy management device can control the energy allocation of the corresponding medium-low voltage microgrid area; Based on the supported power, the discharge capacity of the energy storage in the first medium-low voltage microgrid area and the adjustable capacity of the adjustable load are detected to determine the supported power. When the supportable power is greater than or equal to the support power, the support power of distributed new energy will be fully met by the energy storage and adjustable load of the first medium and low voltage microgrid area. When the available power is less than the supporting power, the supporting power of distributed new energy sources is mobilized through a closed-loop operation channel to meet the support requirements through other medium and low voltage microgrid areas.

4. The flexible control method for microgrid distribution areas based on shared energy storage according to claim 3, characterized in that, When the available power is less than the supporting power, the supporting power of distributed renewable energy is mobilized using a closed-loop operation channel, and the supporting demand is met through other medium and low voltage microgrid areas. Specifically: When the available power is less than the supporting power, the energy storage and adjustable load of the first medium-low voltage microgrid area shall prioritize supporting the supporting power of the distributed new energy corresponding to the available power; according to the energy management device of the first medium-low voltage microgrid area, a request shall be sent to other areas of the medium-low voltage microgrid group to apply for supporting the remaining distributed new energy. When the power that can be supported by the energy storage and adjustable load of other distribution areas in the medium- and low-voltage microgrid group is less than the supporting power of the remaining distributed new energy, the medium- and low-voltage microgrid group will allocate the supporting power of the remaining distributed new energy to the other distribution areas with supporting capabilities through a closed-loop operation channel. Otherwise, the local low-voltage microgrid group will prioritize supporting the remaining distributed renewable energy power, and then send a request to the local low-voltage microgrid group to request the remaining distributed renewable energy power to be supplied. The remaining distributed renewable energy power will then be distributed to other low-voltage microgrid groups with the capacity to provide support through a closed-loop operation channel.

5. The flexible control method for microgrid distribution areas based on shared energy storage according to claim 1, characterized in that, The regulation of the operation of medium- and low-voltage microgrids based on the absorption and support methods of distributed renewable energy power is specifically as follows: Based on the absorption and support methods of distributed renewable energy power in medium and low voltage microgrid areas, the power of distributed renewable energy is allocated among multiple medium and low voltage microgrid areas through a closed-loop operation channel, and the distributed renewable energy is shared between microgrids and microgrid groups to control the load balance of medium and low voltage microgrid operation.

6. A flexible control system for microgrid distribution areas based on shared energy storage, characterized in that, include: Power absorption module, power support module and system control module; The power absorption module is used to acquire the increased power of distributed renewable energy, detect the absorbable power of energy storage in the medium- and low-voltage microgrid area, and configure the power absorption method of distributed renewable energy based on the pre-constructed closed-loop operation channel and the absorbable power. Specifically, it acquires the increased power of distributed renewable energy through the energy management device of the first medium- and low-voltage microgrid area; wherein the energy management device can control the energy allocation of the corresponding medium- and low-voltage microgrid area; and detects the rechargeable capacity and adjustable load of the energy storage in the first medium- and low-voltage microgrid area based on the increased power. The adjustable capacity can absorb the power; when the absorbable power is greater than or equal to the increased power, the SOC balancing principle is adopted to fully absorb the increased power of distributed new energy through the energy storage and adjustable load of the first medium- and low-voltage microgrid area; when the absorbable power is less than the increased power, a closed-loop operation channel is used to mobilize the increased power of distributed new energy and absorb it through other medium- and low-voltage microgrid areas; wherein, the closed-loop operation channel is constructed between different medium- and low-voltage microgrid areas based on the ports of multiple medium- and low-voltage microgrid areas and multi-port energy routers; The power support module is used to obtain the supporting power of distributed new energy sources, detect the supportable power of energy storage in medium and low voltage microgrid areas, and configure the power support mode of distributed new energy sources according to the closed-loop operation channel and the supportable power. The energy management device monitors the terminal voltage of the power grid feeder in the first medium-low voltage microgrid area in real time. When the terminal voltage is low, it detects the node line where the terminal voltage is located through the optimal path and provides capacitive reactive power support through the nearest energy storage. When the terminal voltage is high, it detects the node line where the terminal voltage is located through the optimal path and provides inductive reactive power consumption through the nearest energy storage. The system control module is used to regulate the operation of the medium and low voltage microgrid according to the absorption and support methods of distributed new energy power.

7. The flexible control system for microgrid distribution areas based on shared energy storage according to claim 6, characterized in that, When the absorbable power is less than the increased power, the increased power of distributed renewable energy is mobilized using a closed-loop operation channel and absorbed through other medium- and low-voltage microgrid areas. Specifically: When the absorbable power is less than the increased power, the energy storage and adjustable load of the first medium-low voltage microgrid area shall prioritize absorbing the increased power of the distributed new energy corresponding to the absorbable power; according to the energy management device of the first medium-low voltage microgrid area, a request shall be sent to other areas of the medium-low voltage microgrid group to apply for absorption of the remaining increased power of the distributed new energy. When the power that can be absorbed by the energy storage and adjustable load of other distribution areas in the medium- and low-voltage microgrid group is greater than or equal to the increased power of the remaining distributed new energy, the medium- and low-voltage microgrid group adopts the SOC balance principle to allocate the increased power of the remaining distributed new energy to the other distribution areas with absorption capacity through a closed-loop operation channel. Otherwise, the local low-voltage microgrid group will first absorb part of the remaining increased power from distributed renewable energy sources locally. Then, the local low-voltage microgrid group will send a request to other low-voltage microgrid groups to absorb the remaining increased power from distributed renewable energy sources. The remaining increased power from distributed renewable energy sources will be distributed to other low-voltage microgrid groups with absorption capacity through a closed-loop operation channel.

8. The flexible control system for microgrid distribution areas based on shared energy storage according to claim 6, characterized in that, The system control module includes: a data acquisition unit and a configuration support unit; The data acquisition unit is used to acquire the supporting power of distributed new energy sources according to the energy management device of the first medium-low voltage microgrid area; wherein the energy management device can control the energy allocation of the corresponding medium-low voltage microgrid area; and according to the supporting power, detect the discharge capacity of the energy storage and the adjustable capacity of the adjustable load of the first medium-low voltage microgrid area to support the power. The configuration support unit is used to fully meet the support requirements by using the energy storage and adjustable load of the first medium-low voltage microgrid area when the supportable power is greater than or equal to the support power; when the supportable power is less than the support power, the unit uses a closed-loop operation channel to mobilize the support power of the distributed new energy and meet the support requirements through other medium-low voltage microgrid areas.

9. The flexible control system for microgrid distribution areas based on shared energy storage according to claim 8, characterized in that, When the available power is less than the supporting power, the supporting power of distributed renewable energy is mobilized using a closed-loop operation channel, and the supporting demand is met through other medium and low voltage microgrid areas. Specifically: When the available power is less than the supporting power, the energy storage and adjustable load of the first medium-low voltage microgrid area shall prioritize supporting the supporting power of the distributed new energy corresponding to the available power; according to the energy management device of the first medium-low voltage microgrid area, a request shall be sent to other areas of the medium-low voltage microgrid group to apply for supporting the remaining distributed new energy. When the power that can be supported by the energy storage and adjustable load of other distribution areas in the medium- and low-voltage microgrid group is less than the supporting power of the remaining distributed new energy, the medium- and low-voltage microgrid group will allocate the supporting power of the remaining distributed new energy to the other distribution areas with supporting capabilities through a closed-loop operation channel. Otherwise, the local low-voltage microgrid group will prioritize supporting the remaining distributed renewable energy power, and then send a request to the local low-voltage microgrid group to request the remaining distributed renewable energy power to be supplied. The remaining distributed renewable energy power will then be distributed to other low-voltage microgrid groups with the capacity to provide support through a closed-loop operation channel.

10. The flexible control system for microgrid distribution areas based on shared energy storage according to claim 6, characterized in that, The regulation of the operation of medium- and low-voltage microgrids based on the absorption and support methods of distributed renewable energy power is specifically as follows: Based on the absorption and support methods of distributed renewable energy power in medium and low voltage microgrid areas, the power of distributed renewable energy is allocated among multiple medium and low voltage microgrid areas through a closed-loop operation channel, and the distributed renewable energy is shared between microgrids and microgrid groups to control the load balance of medium and low voltage microgrid operation.

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