Distribution network heavy overload control method and system

Abstract

The present application relates to a method for controlling heavy overloads in a distribution network, including collecting the total power load, total power generation load, charging facility load and distributed power supply operation status of the feeder. The total power load and the total power generation load are compared with the heavy load limit respectively. If the total power load is greater than the heavy load limit and the distributed power supply is in a power-limited operation state, the power generation power limit of the distributed power supply is released. If the total power generation load is greater than the heavy load limit, the proportion of the charging facility load to the total power load is compared with the lower limit of the proportion of the charging facility load and the upper limit of the proportion of the charging facility load. If the proportion of the charging facility load to the total power load is less than the lower limit of the proportion of the charging facility load, the real-time electricity price of the charging facility is reduced. The characteristics of the electric vehicle being flexible to move and the distributed power supply being flexible to control are utilized to adjust the power consumption and charging behaviors in the distribution network.

Description

Technical Field

[0001] The present application relates to the field of power distribution automation technology, and in particular to a method and system for controlling heavy overload of a distribution network. Background Art

[0002] As the link directly facing users, the operation status of the distribution network will directly affect the power supply quality. With the rapid development of social economy and the rapid growth of electricity demand, the electricity load for production and life is constantly rising. This makes the load on the original distribution and transformation equipment of the power grid increasingly serious. The heavy overload operation of the equipment has become a major hidden danger to the safe operation of the power grid.

[0003] With the large-scale development of electric vehicles, a large number of electric vehicles are connected to the power grid, increasing the load on the power system. If a large number of electric vehicles are connected for charging during the peak period of the load curve, the peak-to-valley difference of the power grid load curve will be further widened. This may lead to problems such as overload of distribution network lines and distribution transformers, and even exceed the bearing capacity of the local distribution network, bringing burdens to the safe operation of the power grid.

[0004] On the other hand, the application scale of distributed power sources and energy storage devices is gradually increasing. By tapping their regulation potential, the overload situation of the distribution network can be effectively alleviated. However, in some cases, the power load of the distribution network has dropped significantly compared to usual times, and the distributed power sources generate electricity and send it back to the grid, which may cause the distribution network to be overloaded in the reverse direction.

[0005] Traditional methods of heavy overload control: First, carry out load monitoring and load analysis of distribution lines and substations, replace heavy overload equipment in advance, and expand capacity; second, reasonably arrange the line operation mode to transfer the load from the heavy overload area to the light overload area; third, implement an orderly power consumption plan during peak load periods.

[0006] In traditional technology, the method of replacing equipment for expansion cannot adapt to the development speed of distributed resources, and the investment in equipment expansion is large. Summary of the invention

[0007] Based on this, it is necessary to provide a distribution network heavy overload control method and system to address the problem that the method of expanding capacity by replacing equipment cannot adapt to the development speed of distributed resources and the investment in equipment expansion is large.

[0008] The present application provides a distribution network heavy overload control method, comprising:

[0009] Collect the total power load of the feeder, the total power generation load, the charging facility load and the operating status of the distributed power source.

[0010] The total electricity consumption load and the total power generation load are respectively compared with the heavy load limit.

[0011] If the total power load is greater than the heavy load limit and the distributed power source is in a power-limited operation state, the power generation limit of the distributed power source is released.

[0012] If the total power generation load is greater than the heavy load limit, the proportion of the charging facility load to the total power load is compared with the lower limit of the proportion of the charging facility load and the upper limit of the proportion of the charging facility load. If the proportion of the charging facility load to the total power load is less than the lower limit of the proportion of the charging facility load, the real-time electricity price of the charging facility is reduced.

[0013] In one of the embodiments, the total power load of the feeder, the total power generation load, the charging facility load and the distributed power supply operation status are collected, and the actual power of the energy storage device is also collected.

[0014] If the total power load is greater than the heavy load limit and the distributed power source is in a power-limited operation state, the power generation limit of the distributed power source is released. If the total power load is greater than the heavy load limit, it is determined whether the actual power of the energy storage device is greater than zero. If the actual power of the energy storage device is greater than zero, the real-time power generation price of the energy storage device is increased.

[0015] In one of the embodiments, if the actual power level of the energy storage device is not greater than zero, the real-time power generation price of the energy storage device remains unchanged.

[0016] In one embodiment, if the total power load is greater than the heavy load limit and the distributed power source is in a power-limited operation state, the power generation limit of the distributed power source is released. If the total power load is greater than the heavy load limit, the proportion of the charging facility load to the total power load is compared with the upper limit of the charging facility load proportion and the lower limit of the charging facility load proportion. If the proportion of the charging facility load to the total power load is greater than the upper limit of the charging facility load proportion, the real-time electricity price of the charging facility of the feeder is increased.

[0017] In one of the embodiments, if the proportion of the charging facility load to the total electricity load is less than the lower limit of the charging facility load proportion, the real-time electricity price of the charging facility remains unchanged.

[0018] In one embodiment, if the total power generation load is greater than the heavy load limit, the proportion of the charging facility load to the total power load is compared with the lower limit of the proportion of the charging facility load and the upper limit of the proportion of the charging facility load. If the proportion of the charging facility load to the total power load is less than the lower limit of the proportion of the charging facility load, the real-time electricity price of the charging facility is reduced. If the total power generation load is greater than the heavy load limit, and the proportion of the charging facility load to the total power load is greater than the upper limit of the proportion of the charging facility load, the real-time electricity price of the charging facility remains unchanged.

[0019] In one embodiment, if the total power generation load is greater than the heavy load limit, the proportion of the charging facility load to the total power load is compared with the lower limit of the proportion of the charging facility load and the upper limit of the proportion of the charging facility load. If the proportion of the charging facility load to the total power load is less than the lower limit of the proportion of the charging facility load, the real-time electricity price of the charging facility is reduced. If the total power generation load is greater than the heavy load limit, it is determined whether the actual power of the energy storage device is less than the capacity of the energy storage device. If the actual power of the energy storage device is less than the capacity of the energy storage device, the real-time charging price of the energy storage device is reduced.

[0020] In one of the embodiments, if the actual power of the energy storage device is not less than the power capacity of the energy storage device, the real-time charging electricity price of the energy storage device remains unchanged.

[0021] In one embodiment, if the total power generation load is greater than the heavy load limit, the proportion of the charging facility load to the total power load is compared with the lower limit of the proportion of the charging facility load and the upper limit of the proportion of the charging facility load. If the proportion of the charging facility load to the total power load is less than the lower limit of the proportion of the charging facility load, the real-time electricity price of the charging facility is reduced. If the total power generation load is greater than the heavy load limit and the distributed power source is not in a power-limited operation state, the power generation power limit of the distributed power source is started.

[0022] The present application provides a distribution network heavy overload control system, comprising:

[0023] The data collection terminal is used to connect to the feeder, charging facility, energy storage device and distributed power source respectively. The data collection terminal is used to collect the total power load of the feeder, the total power generation load, the load of the charging facility, the actual power of the energy storage device and the operating status of the distributed power source.

[0024] A power grid monitoring system is connected to the acquisition terminal. The power grid monitoring system is used to receive the total power load, the total power generation load, the charging facility load, the actual power of the energy storage device and the operating status of the distributed power source. The power grid monitoring system compares the total power load and the total power generation load of the feeder (400) with the heavy load limit respectively. If the total power load is greater than the heavy load limit and the distributed power source (700) is in a power-limited operating state, the power generation limit of the distributed power source (700) is released. If the total power generation load is greater than the heavy load limit, the proportion of the charging facility load to the total power load is compared with the lower limit of the proportion of the charging facility load and the upper limit of the proportion of the charging facility load. If the proportion of the charging facility load to the total power load is less than the lower limit of the proportion of the charging facility load, the real-time electricity price of the charging facility (500) is reduced.

[0025] The display terminal is connected to the power grid monitoring system for receiving and displaying the real-time electricity price.

[0026] In the distribution network heavy overload control method and system described in the embodiment of the present application, when the total power load of the feeder is too high, resulting in an overload, the power limit of the distributed power supply is released to encourage the behavior of charging the distribution network. When the total charging load of the feeder is too high, resulting in an overload, the real-time electricity price of the charging facility of the feeder is reduced to guide electric vehicles to charge at the charging facility of the feeder, thereby encouraging electricity consumption on the feeder. There is no need to change the equipment on the distribution network, and the electric vehicle charging facilities and the distributed power sources are included in the distribution network heavy overload control process, and the characteristics of the electric vehicle being flexible to move and the distributed power sources being flexible to control are used to adjust the electricity consumption and charging behavior in the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A flow chart of a distribution network heavy overload control method provided in one embodiment of the present application;

[0029] Figure 2 A flow chart of a distribution network heavy overload control method provided by another embodiment of the present application;

[0030] Figure 3A flow chart of a distribution network heavy overload control method provided by another embodiment of the present application;

[0031] Figure 4 A schematic diagram of a distribution network heavy overload control system provided in one embodiment of the present application.

[0032] Description of Figure Numbers

[0033] Distribution network heavy overload control system 10, collection terminal 100, power grid monitoring system 200, display terminal 300, feeder 400, charging facility 500, energy storage device 600, distributed power source 700. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of this application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0036] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] See also Figure 1 The present application provides a distribution network heavy overload control method, comprising:

[0038] S10, collecting the total power load of the feeder, the total power generation load, the charging facility load and the operating status of the distributed power source;

[0039] S20, comparing the total power consumption load and the total power generation load with the heavy load limit respectively;

[0040] S30, if the total power load is greater than the heavy load limit and the distributed power source is in a power-limited operation state, then releasing the power generation limit of the distributed power source;

[0041] If the total power generation load is greater than the heavy load limit, then the proportion of the charging facility load to the total power consumption load is compared with the lower limit of the proportion of the charging facility load and the upper limit of the proportion of the charging facility load respectively;

[0042] If the proportion of the charging facility load to the total electricity load is less than the lower limit of the proportion of the charging facility load, the real-time electricity price of the charging facility is reduced.

[0043] In S10, the total power load includes the conventional power load and the charging facility load. The conventional power load is the power load taken from the distribution network by conventional power devices, and the charging facility load is the power load taken from the distribution network by the charging facility. The total power generation load is the sum of the loads of the power generation devices on the feeder charging the distribution network.

[0044] In S20, the total power consumption load and the total power generation load are compared with the heavy load limit respectively to determine whether the feeder is in a heavy overload operation state, and to determine whether the feeder is in a power consumption heavy overload operation state or a charging heavy overload operation state.

[0045] In S30, when the total power load is greater than the heavy load limit, the feeder is in a heavy power overload operation state. At this time, the power generation limit of the distributed power source in the limited power operation state is released. After the power generation limit of the distributed power source is released, the power generation of the distributed power source increases. After the electricity generated by the distributed power source enters the feeder, it is directly used to power the conventional power devices and the charging facilities of the feeder. At this time, the amount of electricity consumed by the conventional power devices and the charging facilities from the distribution network is reduced, and the total power load of the feeder is reduced. The heavy power overload situation of the feeder is effectively alleviated.

[0046] When the total power generation load is greater than the heavy load limit, the feeder is in a charging heavy overload operation state. At this time, the proportion of the charging facility load to the total power load is compared with the lower limit of the proportion of the charging facility load and the upper limit of the proportion of the charging facility load. If the proportion of the charging facility load to the total power load is less than the lower limit of the proportion of the charging facility load, it means that the power consumption of the charging facility is very small, and the charging facility load is still within the normal range after the increase. At this time, the real-time electricity price of the charging facility is reduced to guide electric vehicle owners to transfer their electric vehicles to the charging facilities of the feeder for charging. At this time, the charging facilities will directly consume the total power generation load, and the total power generation load will be reduced, so the power generation heavy overload situation of the feeder will be alleviated.

[0047] The distribution network heavy overload control method alleviates the heavy overload of the feeder by stimulating the behavior of charging the distribution network. The charging heavy overload of the feeder is alleviated by stimulating the power consumption behavior on the feeder. There is no need to change the equipment on the distribution network. The electric vehicle charging facilities and the distributed power sources are included in the distribution network heavy overload control process, and the characteristics of the electric vehicle's flexible mobility and the distributed power sources' flexible control are used to adjust the power consumption and charging behavior in the distribution network.

[0048] In one embodiment, the lower limit of the charging facility load ratio and the upper limit of the charging facility load ratio can be adjusted according to actual conditions.

[0049] In one embodiment, the lower limit of the charging facility load ratio is 20%, and the upper limit of the charging facility load ratio is 30%.

[0050] See also Figure 2 In one embodiment, the S10 further includes collecting the actual power of the energy storage device. In the S30, if the total power load is greater than the heavy load limit, it is determined whether the actual power of the energy storage device is greater than zero. If the actual power of the energy storage device is greater than zero, the real-time power generation price of the energy storage device is increased.

[0051] In S10, when the energy storage device generates electricity, it will charge the distribution network. When the energy storage device is charged, it will use the electricity of the distribution network. The real-time power generation price of the energy storage device is the price per kilowatt-hour that the energy storage device needs to pay to the user when generating electricity, and the real-time charging price of the energy storage device is the price per kilowatt-hour that the user needs to pay when charging the energy storage device.

[0052] In the S30, when the total electricity load is greater than the heavy load limit (that is, the feeder is in a heavy overload operation state), the actual power of the energy storage device can also be compared with zero. If the actual power of the energy storage device is greater than zero, it means that the energy storage device can generate electricity. At this time, the real-time power generation price of the energy storage device is increased to guide the user to control the energy storage device to generate electricity. After the electricity generated by the energy storage device enters the feeder, it is directly used to power the conventional electrical devices and the charging facilities. At this time, the total electricity load of the feeder is reduced. When the total electricity load is reduced to less than the heavy load limit, the feeder is no longer in a heavy overload operation state.

[0053] See also Figure 2 In one embodiment, if the actual power of the energy storage device is not greater than zero, the real-time power generation price of the energy storage device remains unchanged.

[0054] If the actual power of the energy storage device is not greater than zero, it means that the energy storage device cannot generate electricity. At this time, the real-time power generation price of the energy storage device is not changed.

[0055] In one embodiment, if the actual power level of the energy storage device is not greater than zero, the real-time charging electricity price of the energy storage device is increased.

[0056] See also Figure 2 In one embodiment, in S30, if the total power load is greater than the heavy load limit, the proportion of the charging facility load to the total power load is compared with the upper limit of the charging facility load proportion and the lower limit of the charging facility load proportion. If the proportion of the charging facility load to the total power load is greater than the upper limit of the charging facility load proportion, the real-time electricity price of the charging facility of the feeder is increased.

[0057] When the total electricity load is greater than the heavy load limit (i.e., the feeder is in a heavy overload operation state), the proportion of the charging facility load to the total electricity load is compared with the upper limit of the charging facility load proportion and the lower limit of the charging facility load proportion. When the proportion of the charging facility load to the total electricity load is greater than the upper limit of the charging facility load proportion, the charging facility consumes too much electricity and the charging facility load is not within the normal range. At this time, the real-time electricity price of the charging facility is increased to guide electric vehicle owners to stop charging at the charging facility on the feeder. In this way, the total electricity load is reduced and the heavy overload of the feeder is alleviated.

[0058] See also Figure 2 In one embodiment, if the proportion of the charging facility load to the total electricity load is less than the lower limit of the charging facility load proportion, the real-time electricity price of the charging facility remains unchanged.

[0059] When the proportion of the charging facility load to the total power load is less than the lower limit of the charging facility load proportion, the power consumption of the charging facility is very small. Reducing the charging facility load has little effect on the total power load and cannot return the feeder to normal operation. Therefore, the real-time electricity price of the charging facility remains unchanged. At the same time, the conventional power grid heavy overload processing method is adopted to cut off the load according to the power load level.

[0060] See also Figure 3 In one embodiment, in S30, if the total power generation load is greater than the heavy load limit, and the proportion of the charging facility load to the total power consumption load is greater than the upper limit of the charging facility load proportion, the real-time electricity price of the charging facility remains unchanged.

[0061] If the total power generation load is greater than the heavy load limit (i.e. the feeder is in a charging heavy overload operation state), and the proportion of the charging facility load to the total power load is greater than the upper limit of the charging facility load proportion (i.e. the charging facility consumes too much electricity). At this time, the charging facility load exceeds the normal range and the charging facility load cannot be increased. Therefore, the real-time electricity price of the charging facility remains unchanged.

[0062] See also Figure 3 In one embodiment, in S30, if the total power generation load is greater than the heavy load limit, it is determined whether the actual power of the energy storage device is less than the capacity of the energy storage device. If the actual power of the energy storage device is less than the capacity of the energy storage device, the real-time charging price of the energy storage device is reduced.

[0063] When the total power generation load is greater than the heavy load limit (that is, the feeder is in a charging heavy overload operation state), it is determined whether the energy storage device can be charged by judging whether the actual power of the energy storage device is less than the capacity of the energy storage device. If the actual power of the energy storage device is less than the capacity of the energy storage device, the energy storage device can be charged. At this time, the real-time charging electricity price of the energy storage device is reduced to guide the user to control the energy storage device to charge. The total charging load will be consumed when the energy storage device is charged. If the total charging load is reduced, the charging heavy overload situation of the feeder will be alleviated.

[0064] See also Figure 3 In one embodiment, if the actual power of the energy storage device is not less than the power capacity of the energy storage device, the real-time charging price of the energy storage device remains unchanged.

[0065] If the actual amount of electricity in the energy storage device is not less than the capacity of the energy storage device, it means that the capacity of the energy storage device is full and the energy storage device cannot be charged any more. At this time, the real-time charging price of the energy storage device remains unchanged.

[0066] In one embodiment, in S30, if the actual power of the energy storage device is not less than the power capacity of the energy storage device, the real-time power generation price of the energy storage device is reduced, so as to guide the user to reduce the power generation behavior of the energy storage device.

[0067] See also Figure 3 In one embodiment, in S30, if the total power generation load is greater than the heavy load limit and the distributed power source is not in a power-limited operation state, the power generation power limitation of the distributed power source is started.

[0068] After the power generation limit of the distributed power source is started, the power generation of the distributed power source will be reduced. Therefore, the total charging load is reduced, effectively alleviating the charging heavy overload situation of the feeder.

[0069] See also Figure 4 The present application provides a distribution network heavy overload control system 10, including a collection terminal 100, a power grid monitoring system 200 and a display terminal 300. The collection terminal 100 is used to be connected to a feeder 400, a charging facility 500, an energy storage device 600 and a distributed power source 700 respectively. The collection terminal 100 is used to collect the total power load of the feeder 400, the total power generation load, the load of the charging facility 500, the actual power of the energy storage device 600 and the operating status of the distributed power source 700.

[0070] The power grid monitoring system 200 is connected to the acquisition terminal 100. The power grid monitoring system 200 is used to receive the total power load, the total power generation load, the charging facility load, the actual power of the energy storage device and the operating status of the distributed power source, and compare the total power load and the total power generation load of the feeder 400 with the heavy load limit respectively. If the total power load is greater than the heavy load limit and the distributed power source 700 is in a power-limited operating state, the power generation limit of the distributed power source 700 is released. If the total power generation load is greater than the heavy load limit, the proportion of the charging facility load to the total power load is compared with the lower limit of the proportion of the charging facility load and the upper limit of the proportion of the charging facility load. If the proportion of the charging facility load to the total power load is less than the lower limit of the proportion of the charging facility load, the real-time electricity price of the charging facility 500 is reduced.

[0071] The display terminal 300 is in communication connection with the power grid monitoring system 200. The display terminal 300 is used to receive and display the real-time electricity price.

[0072] In one embodiment, the display terminal 300 receives and displays the real-time electricity price of the charging facility 500 , the real-time charging electricity price of the energy storage device 600 , and the real-time power generation price of the energy storage device 600 .

[0073] In one embodiment, the display terminal 300 may be a display screen, and the display screens are respectively arranged on the charging facility 500 and the energy storage device 600 .

[0074] In one embodiment, the display terminal 300 may be a mobile phone APP. The mobile phone APP receives the real-time electricity price of the charging facility 500, the real-time charging electricity price of the energy storage device 600, and the real-time power generation price of the energy storage device 600, and forms an electricity price map according to the location information of the charging facility 500 and the energy storage device 600. The mobile phone APP can push the electricity price information to the user.

[0075] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A distribution network heavy overload control method, characterized in that: include: Collect the total power load of the feeder, the total power generation load, the charging facility load, the operating status of the distributed power source and the actual power of the energy storage device; Comparing the total power consumption load and the total power generation load with the heavy load limit respectively; If the total power load is greater than the heavy load limit and the distributed power source is in a power-limited operation state, the power generation limit of the distributed power source is released, and it is determined whether the actual power of the energy storage device is greater than zero; If the actual amount of electricity of the energy storage device is greater than zero, the real-time electricity price of the energy storage device is increased; if the actual amount of electricity of the energy storage device is not greater than zero, the real-time electricity price of the energy storage device remains unchanged; or if the actual amount of electricity of the energy storage device is less than the capacity of the energy storage device, the real-time charging price of the energy storage device is reduced; If the total power generation load is greater than the heavy load limit and the distributed power source is not in a power-limited operation state, the power generation power limitation of the distributed power source is started, and the proportion of the charging facility load to the total power load is compared with the lower limit of the charging facility load and the upper limit of the charging facility load respectively; if the proportion of the charging facility load to the total power load is greater than the upper limit of the charging facility load, the real-time electricity price of the charging facility remains unchanged; if the proportion of the charging facility load to the total power load is less than the lower limit of the charging facility load, the real-time electricity price of the charging facility is reduced.

2. The distribution network heavy overload control method according to claim 1, characterized in that: If the total power load is greater than the heavy load limit, the method further includes: Compare the proportion of the charging facility load to the total electricity load with the upper limit of the charging facility load proportion and the lower limit of the charging facility load proportion respectively; If the proportion of the charging facility load to the total electricity load is greater than the upper limit of the charging facility load proportion, the real-time electricity price of the charging facility of the feeder is increased.

3. The distribution network heavy overload control method according to claim 2, characterized in that: If the proportion of the charging facility load to the total electricity load is less than the lower limit of the charging facility load proportion, the real-time electricity price of the charging facility remains unchanged.

4. The distribution network heavy overload control method according to claim 1, characterized in that: If the total power generation load is greater than the heavy load limit, the method further includes: Determining whether the actual power of the energy storage device is less than the power capacity of the energy storage device; If the actual power of the energy storage device is less than the power capacity of the energy storage device, the real-time charging price of the energy storage device is reduced.

5. The distribution network heavy overload control method according to claim 4, characterized in that: If the actual power of the energy storage device is not less than the power capacity of the energy storage device, the real-time charging price of the energy storage device remains unchanged.

6. A distribution network heavy overload control system, characterized in that: include: A data collection terminal (100) is used to be connected to a feeder (400), a charging facility (500), an energy storage device (600) and a distributed power source (700) respectively, and is used to collect the total power consumption load of the feeder (400), the total power generation load, the load of the charging facility (500), the actual power of the energy storage device (600) and the operating status of the distributed power source (700); A power grid monitoring system (200) connected to the acquisition terminal (100) is used to receive the total power load, the total power generation load, the charging facility load, the actual power of the energy storage device and the operating status of the distributed power source, and compare the total power load and the total power generation load of the feeder (400) with the heavy load limit respectively; The power grid monitoring system (200) is further used to, if the total power load is greater than the heavy load limit and the distributed power source (700) is in a power-limited operation state, release the power generation limit of the distributed power source (700) and determine whether the actual power of the energy storage device (600) is greater than zero; if the actual power of the energy storage device (600) is greater than zero, increase the real-time power generation price of the energy storage device (600); if the actual power of the energy storage device (600) is not greater than zero, keep the real-time power generation price of the energy storage device (600) unchanged; or if the actual power of the energy storage device (600) is less than the power capacity of the energy storage device, reduce the real-time charging price of the energy storage device (600); The power grid monitoring system (200) is further configured to, if the total power generation load is greater than the heavy load limit and the distributed power source is not in a power-limited operation state, start the power generation power limitation of the distributed power source, and compare the proportion of the charging facility load to the total power load with the lower limit of the proportion of the charging facility load and the upper limit of the proportion of the charging facility load; if the proportion of the charging facility load to the total power load is greater than the upper limit of the proportion of the charging facility load, maintain the real-time electricity price of the charging facility (500) unchanged; if the proportion of the charging facility load to the total power load is less than the lower limit of the proportion of the charging facility load, reduce the real-time electricity price of the charging facility (500); The display terminal (300) is connected to the power grid monitoring system (200) for receiving and displaying the real-time electricity price.

7. The system according to claim 6, characterized in that If the total electricity load is greater than the heavy load limit, the power grid monitoring system (200) is further used to compare the proportion of the charging facility load to the total electricity load with the upper limit of the charging facility load proportion and the lower limit of the charging facility load proportion respectively; if the proportion of the charging facility load to the total electricity load is greater than the upper limit of the charging facility load proportion, then increase the real-time electricity price of the charging facility of the feeder.

8. The system according to claim 7, characterized in that The power grid monitoring system (200) is also used to maintain the real-time electricity price of the charging facility unchanged if the proportion of the charging facility load to the total electricity load is less than the lower limit of the charging facility load proportion.

9. The system according to claim 6, characterized in that If the total power generation load is greater than the heavy load limit, the power grid monitoring system (200) is further used to determine whether the actual power of the energy storage device is less than the power capacity of the energy storage device; If the actual power of the energy storage device is less than the power capacity of the energy storage device, the real-time charging price of the energy storage device is reduced.

10. The system according to claim 9, characterized in that The power grid monitoring system (200) is also used to keep the real-time charging electricity price of the energy storage device unchanged if the actual electricity amount of the energy storage device is not less than the electricity capacity of the energy storage device.

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