A multi-level energy router collaborative system and method

Abstract

The present invention discloses a multi-level energy router coordination system and method, including: a total control center, which manages the flow of electric energy in the entire distribution network, including a total energy router and a total energy storage module that can transmit electric energy to each other, and is also provided with a cloud; a unit grid, all unit grids together constitute a distribution network, and each unit grid is provided with a sub-energy router; the sub-energy router and the total energy router can perform two-way transmission of electric energy, and the sub-energy router and the cloud can perform two-way communication; the total energy router and the sub-energy router manage the flow of electric energy according to the actual electric energy required by the unit grid. The present invention uses energy routers as core nodes to form an energy routing network in the entire distribution network, which has the functions of energy management, enhancing the flexibility of the distribution network, regulating the quality of electric energy, and interconnecting network information, etc. It can solve the intermittent problem of distributed energy, improve the utilization efficiency of electric energy, and enhance the working stability of the distribution network.

Description

Technical Field

[0001] The present invention relates to the technical field of energy routers, and in particular to a multi-level energy router coordination system and method. Background Art

[0002] With the access of distributed energy generation, energy storage equipment and different types of electric energy loads, the traditional power system can no longer meet the requirements of diversified power supply forms, multi-dimensional energy flow and power flow regulation, and is not enough to meet the needs of power marketization. The power router composed of power electronic conversion technology can provide flexible and diverse interface electrical for different distributed energy sources and different types of loads, and can also realize the multi-directional flow of energy and active control of power flow. After integrating information technology, the power router has communication and intelligent decision-making capabilities, which can conveniently access new energy generation, energy storage, and loads, realize efficient energy supply and active management of power network energy flow; the power routing network formed with energy routers as the core can give full play to the "routing" function of energy routers, and has the advantages of energy management, flexible access, deep perception, regulation of power quality, and full network information interconnection, providing solid technical support for the gradual implementation of the concept of "high elasticity power grid" and the realization of diversified energy utilization.

[0003] The "Energy Router Operation Control Method and System" disclosed in the Chinese patent literature, with publication number CN113258562A and publication date 2021-08-13, divides the energy router into two working modes: normal operation mode and low voltage ride-through mode. In the normal operation mode, the system coordination and stability are achieved by scheduling the output of the diesel generator in stages, maintaining the power balance between the source and the load, and realizing the SOC regulation of the energy storage unit to ensure the efficient operation of the energy router; in the low voltage ride-through mode, by making the diesel generator and the photovoltaic power generation unit output at the maximum output power, the energy storage unit adopts constant voltage control, and the system-level coordinated control is used to suppress the continuous decline of the bus voltage, support the rapid recovery of the bus voltage, and ensure the effective ride-through of the low voltage fault of the energy router. However, in this technology, only a single energy router is controlled, and in the actual distribution network, a large number of energy routers are required as the core to form the routing network of electric energy. Therefore, a control method is needed to coordinate and control all energy routers to provide the working stability of the distribution network. Summary of the invention

[0004] The present invention aims to overcome the problem in the prior art of lacking technology for coordinating and managing energy flow in a distribution network using a large number of energy routers. A multi-level energy router collaborative system and method is provided, in which energy routers are used as core nodes to form an energy routing network in the entire distribution network. The system has the functions of energy management, enhanced flexibility of distribution networks, power quality regulation, network information interconnection, etc. It can solve the intermittent problem of distributed energy, improve the utilization efficiency of electric energy, and enhance the working stability of distribution networks.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A multi-level energy router coordination system, comprising:

[0007] A general control center is used to manage the flow of electric energy in the entire distribution network. The general control center includes a general energy router and a general energy storage module that can transmit electric energy to each other, and is also equipped with a cloud for data storage;

[0008] Several unit grids, all of which together form the entire distribution network, and each unit grid is provided with a sub-energy router;

[0009] The sub-energy router and the main energy router can perform bidirectional transmission of electric energy, and the sub-energy router and the cloud can perform bidirectional communication.

[0010] In the present invention, the total energy router in the total control center is used as the core node of the distribution network. The total energy router can be a combination of multiple energy routers set in parallel; the sub-energy routers in each unit power grid are used as the next-level nodes to form a radial routing network with the total energy router, covering the entire distribution network, so that the flow of electric energy in the distribution network is controlled and managed through the energy routers at each node. In addition, the total control center is also equipped with cloud storage data information. The data collected by each sub-energy router will be automatically uploaded to the cloud. The total control center can organize and analyze the data received in the cloud, so as to adjust the scheme and planning of the total energy router to control the flow of electric energy in the distribution network.

[0011] Preferably, the unit grid is the minimum distribution network for managing the flow of electric energy, and the sub-energy routers in adjacent unit grids can perform bidirectional transmission of electric energy. In the present invention, the sub-energy routers in adjacent unit grids can also perform bidirectional transmission of electric energy, so that any number of adjacent unit grids in the entire routing network can be combined into a larger distribution network, and electric energy can flow between these unit grids without being controlled by the total energy router. Therefore, even if some energy routers fail, the working stability of the nearby unit grids can be guaranteed.

[0012] Preferably, the unit power grid includes a sub-energy router, which is respectively connected to the energy storage module, several distributed energy sources and several user energy routers for power transmission, and the user energy router is connected to the user-side load. In the present invention, a user energy router is also provided in the next level of the sub-energy router. The user energy router is the most basic node in the energy routing network, which controls the flow of power to the user-side load connected to it, and can also detect the type and parameters of the power consumption of the user-side load, and provide the user-side load with power of higher type and parameter matching, thereby improving power efficiency. The energy storage module is an energy storage device in the unit power grid, which is combined with the distributed energy to supply power to the user-side load in the unit power grid. The power distribution of the sub-energy router can reduce the impact of intermittent power generation of distributed energy on the power grid.

[0013] Preferably, the energy storage module includes several energy storage devices, the distributed energy is a renewable energy power generation device, and the unit power grid is also provided with an environmental parameter acquisition module for collecting environmental parameters that affect the distributed energy power generation efficiency. In the present invention, the energy storage module includes several energy storage devices arranged in parallel, including but not limited to different energy storage methods such as batteries, hydraulic energy storage and thermal energy storage. At the same time, the battery energy storage can also directly move the battery position to achieve the purpose of power transfer without occupying the distribution network transmission load. In addition, distributed energy is mainly photovoltaic power generation, wind power generation, hydropower generation and other renewable resource power generation, which is easily affected by environmental factors and cannot generate electricity stably. Therefore, an environmental parameter acquisition module is set to collect environmental parameters in the vicinity of the distributed energy, which is conducive to predicting the power generation of the distributed energy and facilitating the power flow control of the sub-energy router.

[0014] A multi-level energy router coordination method, comprising:

[0015] S1, predict the electric energy that the unit grid needs to input from the distribution network within a day, and send it to the cloud by the sub-energy router;

[0016] S2. The main control center receives the forecast data from all sub-energy routers and obtains the forecast value of the electric energy that needs to be input from the outside in the entire distribution network within one day;

[0017] S3, the total energy router sets the total initial input power of the entire distribution network according to the power prediction value in S2;

[0018] S4, the total energy router and the sub-energy router manage the flow of electric energy according to the actual electric energy required by the unit power grid.

[0019] In the present invention, since each unit grid can be regarded as a relatively independent microgrid, the electric energy generated by its distributed energy is first consumed locally in the unit grid, and the connection between the unit grid and the outside world is the input and output of electric energy in the distribution network. In the actual process, each unit grid needs to have the electric energy input of the distribution network to meet the electricity demand. Therefore, it is necessary to first predict the distribution network electric energy input required by each unit grid plan, and then the general control center will summarize it to obtain the predicted value of electric energy input from the outside world required for the entire distribution network plan. According to the predicted value, the total initial input electric energy that the total energy router is expected to control next is set. When starting to input electric energy, the initial input electric energy is used as the basis, and then the input electric energy of each unit grid is fine-tuned according to the actual load power consumption and distributed energy generation, so as to ensure the stable operation of the distribution network.

[0020] Preferably, the S1 comprises the following steps:

[0021] S11, predicting the total electricity consumption of the user side load within one day;

[0022] S12. Predict the total power generation of distributed energy in one day;

[0023] S13, comparing the difference between the total power consumption and the total power generation with the storage capacity of the energy storage module to obtain the electric energy that needs to be input from the outside.

[0024] In the present invention, the total electricity consumption of the user-side load in the unit grid is the electric energy that the unit grid is expected to consume, the total amount of distributed energy generation and the amount of storage energy in the energy storage module are the maximum total amount of electric energy that can be provided within the unit grid, and the difference between the two is the electric energy that needs to be input into the unit grid by the distribution network.

[0025] Preferably, in S4, during the power flow management process, the priority of the user-side load consuming power is from high to low: distributed energy power generation power, energy storage module storage power, and power input from the distribution network. In the present invention, when consuming power, priority is given to consuming power generated by distributed energy. When the distributed energy power generation is insufficient, power can be supplied by the energy storage module. In this way, the local consumption of distributed energy can be completed in priority. At the same time, the cooperation of the energy storage module can avoid the impact of the intermittent nature of distributed energy on load power consumption. The power input from the distribution network is supplied as the lowest priority, which can reduce the load of power transmission of the distribution network. At the same time, the excess distributed energy power and the power input from the distribution network can charge the energy storage module to ensure that the energy storage module has enough power storage.

[0026] The present invention has the following beneficial effects: an energy routing network is formed in the entire power distribution network with energy routers as core nodes, and has the functions of energy management, enhancing the flexibility of the distribution network, regulating the power quality, and interconnecting network information, which can solve the intermittent problem of distributed energy, improve the utilization efficiency of electric energy, and enhance the working stability of the distribution network; energy routers are formed into an energy routing network at different levels, and each energy router can control the flow of electric energy of the corresponding unit power grid. Therefore, when a partial failure occurs in the distribution network, each unit power grid or multiple adjacent unit power grids can form an island to control the internal power flow, thereby ensuring that the distribution network can still work normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic block diagram of a multi-level energy router coordination system of the present invention;

[0028] Figure 2 is a schematic diagram of the connection of energy routers within a unit power grid of the present invention;

[0029] Figure 3 It is a flow chart of the coordinated control method of the multi-level energy router of the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] like Figure 1 As shown, a multi-level energy router collaborative system includes a general control center for managing the flow of electric energy in the entire distribution network, the general control center is provided with a total energy router, a total energy storage module and a cloud; the total energy router and the total energy storage module can transmit electric energy to each other, and the cloud is used to store received data; it also includes n unit power grids, the first unit power grid to the nth unit power grid together constitute the entire distribution network, and a sub-energy router is provided in each unit power grid; each sub-energy router performs bidirectional transmission of electric energy with the total energy router, and at the same time the sub-energy router is connected to the cloud for communication to transmit information data.

[0032] The unit grid is the smallest distribution network for managing the flow of electric energy in the distribution network. The sub-energy routers in any adjacent unit grid can transmit electric energy in both directions.

[0033] The unit grid includes sub-energy routers, such as Figure 2 As shown, the sub-energy router and the energy storage module can transmit electric energy bidirectionally, the sub-energy router can transmit electric energy to each distributed energy source, the sub-energy router can transmit electric energy to each user energy router, and the user energy router is connected to the user-side load one by one.

[0034] The energy storage modules in the unit grid can be energy storage devices of different types and quantities. Distributed energy is preferentially connected to renewable energy power generation equipment. An environmental parameter collection module is also provided in the unit grid to collect environmental parameters that affect the efficiency of distributed energy generation.

[0035] In the present invention, the total energy router in the total control center is used as the core node of the distribution network. The total energy router can be a combination of multiple energy routers set in parallel; the sub-energy routers in each unit power grid are used as the next-level nodes to form a radial routing network with the total energy router, covering the entire distribution network, so that the flow of electric energy in the distribution network is controlled and managed through the energy routers at each node. In addition, the total control center is also equipped with cloud storage data information. The data collected by each sub-energy router will be automatically uploaded to the cloud. The total control center can organize and analyze the data received in the cloud, so as to adjust the scheme and planning of the total energy router to control the flow of electric energy in the distribution network.

[0036] In the present invention, bidirectional transmission of electric energy can also be carried out between the sub-energy routers in adjacent unit power grids, so that any number of adjacent unit power grids in the entire routing network can be combined into a larger distribution network, and electric energy can flow between these unit power grids without being controlled by the total energy router. Therefore, even if some energy routers fail, the working stability of nearby unit power grids can be guaranteed.

[0037] In the present invention, a user energy router is also provided in the next level of the sub-energy router. The user energy router is the most basic node in the energy routing network. It controls the flow of electric energy for the user-side load connected to it, and can also detect the type and parameters of the user-side load electricity consumption, and provide the user-side load with electric energy with a higher type and parameter matching degree, thereby improving the efficiency of electricity consumption. The energy storage module is an electric energy storage device in the unit power grid, which is combined with distributed energy to supply power to the user-side load in the unit power grid. The electric energy distribution of the sub-energy router can reduce the impact of intermittent power generation of distributed energy on the power grid.

[0038] The energy storage module in the present invention includes several energy storage devices arranged in parallel, including but not limited to different energy storage methods such as batteries, water storage and thermal storage. At the same time, the battery energy storage can also directly move the battery position to achieve the purpose of power transfer without occupying the transmission load of the distribution network. In addition, distributed energy is mainly photovoltaic power generation, wind power generation, hydropower generation and other renewable resources power generation, which are easily affected by environmental factors and cannot generate electricity stably. Therefore, an environmental parameter acquisition module is set to collect environmental parameters of the area near the distributed energy, which is conducive to predicting the power generation of distributed energy and facilitating the power flow control of the sub-energy router.

[0039] A multi-level energy router coordination method, such as Figure 3 As shown, including:

[0040] S1, predicting the electric energy that the unit power grid needs to input from the distribution network within a day, and the sub-energy router sends the prediction result to the cloud; S1 specifically includes the following steps:

[0041] S11, predicting the total power consumption Wic of the user-side load of the i-th unit power grid in one day;

[0042] S12, predict the total power generation Wig of distributed energy in the i-th unit power grid within one day;

[0043] S13, comparing the difference between the total power consumption Wc and the total power generation Wg with the storage energy Qi of the energy storage module to obtain the electric energy Wiq that needs to be input from the outside.

[0044] S2. The main control center sums up all the prediction data from the sub-energy routers to obtain the predicted value of the electric energy that needs to be input from the outside in the entire distribution network within one day;

[0045] S3, the total energy router sets the initial total input power Qt of the entire distribution network according to the power prediction value in S2;

[0046] S4. According to the actual electric energy required by the unit power grid, the total energy router and the sub-energy router respectively manage the electric energy flow of the electric energy input from the distribution network; in the process of electric energy flow management, the user-side load first consumes the electric energy generated by the distributed energy, then consumes the electric energy stored in the energy storage module, and finally consumes the electric energy input from the distribution network.

[0047] In the present invention, since each unit grid can be regarded as a relatively independent microgrid, the electric energy generated by its distributed energy is first consumed locally in the unit grid, and the connection between the unit grid and the outside world is the input and output of electric energy in the distribution network. In the actual process, each unit grid needs to have the electric energy input of the distribution network to meet the electricity demand. Therefore, it is necessary to first predict the distribution network electric energy input required by each unit grid plan, and then the general control center will summarize it to obtain the predicted value of electric energy input from the outside world required for the entire distribution network plan. According to the predicted value, the total initial input electric energy that the total energy router is expected to control next is set. When starting to input electric energy, the initial input electric energy is used as the basis, and then the input electric energy of each unit grid is fine-tuned according to the actual load power consumption and distributed energy generation, so as to ensure the stable operation of the distribution network.

[0048] In the present invention, the total electricity consumption of the user-side load in the unit grid is the electric energy that the unit grid is expected to consume, the total amount of distributed energy generation and the amount of storage energy in the energy storage module are the maximum total amount of electric energy that can be provided within the unit grid, and the difference between the two is the electric energy that needs to be input into the unit grid by the distribution network.

[0049] In the present invention, priority is given to consuming electric energy generated by distributed energy sources when electric energy is consumed. When the distributed energy generation is insufficient, power can be supplied by the energy storage module. In this way, the local consumption of distributed energy can be completed in priority. At the same time, the cooperation of the energy storage module can avoid the impact of the intermittent nature of distributed energy on load power consumption. The electric energy input from the distribution network is used as the lowest priority power supply, which can reduce the load of the distribution network power transmission. At the same time, the excess distributed energy electric energy and the electric energy input from the distribution network can charge the energy storage module to ensure that the energy storage module has sufficient electric energy storage.

[0050] In the embodiments of the present invention, each unit grid area can be regarded as a relatively independent microgrid, with a corresponding sub-energy router to manage and control the flow of electric energy. At the same time, there are only two ways to connect the unit grid with the outside world. One is the direct distribution network connection between the sub-energy router and the total energy router, the purpose of which is to complete the control and distribution of the input electric energy of the unit grid by the entire distribution network through the total energy router and the sub-energy router; the other is the two-way transmission of electric energy between the sub-energy routers in adjacent unit grids, which can complete the control of the flow of electric energy between the unit grids directly according to the direct coordination control of the adjacent sub-energy routers without going through the total energy router.

[0051] In addition, the sub-energy router can be used to detect the types and parameters of different distributed access energy sources, including AC or DC, power generation, input voltage and current value, etc.; while the user energy router can detect the types and parameters of user-side load power consumption, including AC or DC, power consumption, rated voltage, rated current, etc. When the sub-energy router controls the flow of power, the power with the same or similar power type and parameters as the user-side load can be used as the preferred power supply source, that is, the AC power supply is preferred to supply the user-side load that consumes AC power, and the DC power supply is preferred to supply the user-side load that consumes DC power. At the same time, for voltage, current and power parameters, the smallest difference is selected first for power supply, and then the difference gradually increases. This can reduce the loss in the power conversion process, thereby improving the utilization efficiency of power in the distribution network. At the same time, the power generated by distributed energy is consumed first in the unit power grid. If the power generated by distributed energy is greater than the power consumed by the user-side load, the excess power can be stored in the energy storage module, that is, the primary goal is to complete the local consumption of distributed energy.

[0052] In the embodiment of the present invention, the prediction result of the electric energy that the unit grid needs to input from the distribution network in one day is explained by taking the i-th unit grid as an example. First, the electric energy Wiq input from the external distribution network is the total electric energy that the unit grid needs to consume in one day minus the total electric energy that the unit grid can provide by itself in one day. Among them, the total electric energy that the unit grid needs to consume in one day is Wic, which is the total amount of electricity consumed by the user-side load of the unit grid in one day. Since it is a predicted value, and under normal circumstances, the fluctuation range of electricity consumption in adjacent days is small, Wic can use the total amount of electricity consumed by the user-side load of the unit grid on the previous day as the predicted value. As for the total electric energy that the unit grid can provide by itself in one day, it includes two parts, the first part is the electric energy that the distributed energy can provide, and the second part is the electric energy that the energy storage module can provide. The electric energy that distributed energy can provide is Wig, which is the predicted total power generation of distributed energy in a unit grid in one day. Here, the prediction of the total power generation needs to be predicted through the environmental parameters collected by the environmental parameter acquisition module. The power generation of photovoltaic power generation is obtained according to factors such as light intensity and light time; the power generation of wind power generation is obtained according to factors such as wind force level and wind direction; the power generation of new energy power generation is specifically predicted according to the actual values ​​of the influencing factors of new energy power generation, and finally Wig is obtained. As for the energy storage Qi in the energy storage module, when the distribution network suddenly fails, the unit grid or the distribution network composed of adjacent unit grids will not be able to receive the power input from the distribution network as an island. At this time, the sub-energy router needs the energy storage module as the power supply source when controlling the flow of power. Therefore, the energy storage Qi in the energy storage module cannot be used as the power supply energy. Considering that the total power that the unit grid can provide in one day, only a part of Qi can be selected for consideration. In this embodiment, Qi / 2 is selected as the power supply energy for convenience of explanation, and the remaining Qi / 2 is used as emergency backup power. Therefore, the electric energy Wiq that needs to be input from the outside to the i-th unit grid is Wiq=Wic-Wig-Qi / 2. When Wiq is a positive value, it means that Wiq of electric energy needs to be input from the outside to the unit grid. When Wiq is a negative value, it means that there is surplus electric energy in the unit grid and excess electric energy can be input to the distribution network.

[0053] After completing the prediction data Wiq of the electric energy that each unit power grid needs to input from the outside, the sub-energy router will send the prediction data to the cloud of the main control center. The main control center can sum up all the prediction data Wiq on the cloud to obtain the predicted electric energy that the entire distribution network needs to input from the outside. According to the prediction value, the main control center plans to allocate the same value of electric energy as the initial total input electric energy Qt of the entire distribution network within one day. The total energy router first controls the quota of electric energy flow for each unit power grid according to the data information Wiq uploaded by each unit power grid. If the electric energy that the entire distribution network actually needs to input from the outside is greater than Qt, the total energy storage module in the main control center will first provide electric energy and the total energy router will distribute the electric energy. If the energy storage of the total energy storage module is not enough to make up for the electric energy shortage, or the storage capacity of the total energy storage module drops to a certain threshold, such as half of the total amount, the total energy router can continue to obtain electric energy from the outside and input it into the distribution network. If the electric energy that the entire distribution network actually needs to input from the outside is less than Qt, the excess electric energy can be distributed and stored in the total energy storage module by the total energy router, thereby ensuring the stable operation of the distribution network. If the total energy storage module is full, the excess electric energy can be transmitted to the outside through the distribution network again, thereby maintaining the stable operation of the distribution network and completing the flexible control of the distribution network.

[0054] When this embodiment is specific to a certain unit power grid, the power quota input by the distribution network is Wiq, but the power of Wiq is not the first input for consumption by the user-side load. The user-side load needs to consume power, and the power consumption at time t is Pic(t); at the same time, the distributed energy will continue to generate electricity, and the power generation at time t is also Pig(t). When Pic(t) is less than or equal to Pig(t), the distributed energy generation completely supplies the power consumption, and the excess power is controlled by the sub-energy router to flow to the energy storage module, and when the energy storage module is full of power, the excess power is transmitted back to the distribution network. When Pic(t) is greater than Pig(t), it means that the power generation of distributed energy is insufficient to cover the energy consumption of all user-side loads. Therefore, the energy stored in the energy storage module needs to be supplied to the user-side loads through the sub-energy router at the same time, where the maximum output power of the energy storage module is Pqmax; when Pic(t) is less than or equal to Pig(t)+Pqmax, it means that the output power of distributed energy and energy storage module is sufficient to cover the energy consumption of user-side loads, and when Pic(t) is greater than Pig(t)+Pqmax, it means that the output power of distributed energy and energy storage module is insufficient to cover the energy consumption of user-side loads. Therefore, the sub-energy router needs to continue to input energy from the distribution network to the unit grid to meet the consumption; in another case, that is, when Pic(t) is less than or equal to Pig(t)+Pqmax, but the energy stored in the energy storage module is lower than Qi / 2, ​​the energy stored in the energy storage module is lower than the pre-set threshold. At this time, the energy storage module cannot continue to supply power, and the sub-energy router needs to input energy from the distribution network to the unit grid to meet the consumption. This completes the control of the sub-energy router over the flow of electric energy in the unit power grid.

[0055] When a fault somewhere in the distribution network makes it impossible for a unit grid, such as a sub-energy router in the ith unit grid, to mobilize the input of electric energy from the total energy router, since the sub-energy routers in adjacent unit grids can transmit electric energy in both directions, the predetermined quota Wiq originally given to the ith unit grid can be evenly distributed to the unit grids adjacent to the ith unit grid, and the adjacent unit grids transmit electric energy to the ith unit grid through the electric energy transmission network between the sub-energy routers, thereby ensuring the stable supply of electric energy in the ith unit grid, and at the same time reducing the sudden increase in transmission load of a line near the fault area when the distribution network fails, and evenly distributing the transmission load to the transmission lines of multiple unit grids in the distribution network, thereby reducing the probability of secondary failures caused by overload transmission and improving the stability of the distribution network. In addition, when multiple faults occur in the distribution network and the power of the distribution network cannot be input into the unit grid, each unit grid is equivalent to an independent island. At this time, only the distributed energy and the power stored in the energy storage module can supply power to the user-side load. The energy storage module uses additional Qi / 2 emergency backup power to maintain low power consumption of the user-side load in the unit grid. At the same time, since the energy storage module includes a battery, the fully charged battery can be transported by vehicle and replaced with the battery without power in the unit grid, thereby extending the power supply time for the user-side load in the unit grid and avoiding the inconvenience caused to users by power outages.

[0056] The above embodiments are further elaborations and illustrations of the present invention for ease of understanding, and are not limitations of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-level energy router collaborative system, characterized in that: include: A general control center is used to manage the flow of electric energy in the entire distribution network. The general control center includes a general energy router and a general energy storage module that can transmit electric energy to each other, and is also equipped with a cloud for data storage; Several unit grids, all of which together form the entire distribution network, each unit grid is equipped with a sub-energy router; the sub-energy routers in adjacent unit grids can perform bidirectional transmission of electric energy; When the sub-energy router of the i-th unit grid cannot mobilize the input of electric energy from the total energy router, the predetermined quota originally given to the i-th unit grid is evenly distributed to the unit grids adjacent to the i-th unit grid, and the adjacent unit grids transmit electric energy to the i-th unit grid; The sub-energy router and the main energy router can perform two-way transmission of electric energy, and the sub-energy router and the cloud can perform two-way communication; The sub-energy router is connected to an energy storage module, which includes a plurality of energy storage devices, including but not limited to batteries, hydraulic energy storage and thermal energy storage; battery energy storage is used to transfer electric energy without occupying the transmission load of the distribution network through mobile batteries.

2. A multi-level energy router collaborative system according to claim 1, characterized in that: The unit grid is the smallest distribution network for managing the flow of electric energy.

3. A multi-level energy router collaborative system according to claim 1 or 2, characterized in that: The unit power grid includes a sub-energy router, and the sub-energy router is also connected to a plurality of distributed energy sources and a plurality of user energy routers for power transmission. The user energy router is connected to the user-side load.

4. A multi-level energy router collaborative system according to claim 3, characterized in that: The distributed energy is a renewable energy power generation device, and the unit power grid is also provided with an environmental parameter collection module for collecting environmental parameters that affect the power generation efficiency of the distributed energy.

5. A multi-level energy router coordination method, applicable to the multi-level energy router coordination system as claimed in claim 1, 2 or 4, characterized in that: include: S1, predict the electric energy that the unit grid needs to input from the distribution network within a day, and send it to the cloud by the sub-energy router; S2. The main control center receives the forecast data from all sub-energy routers and obtains the forecast value of the electric energy that needs to be input from the outside in the entire distribution network within one day; S3, the total energy router sets the total initial input power of the entire distribution network according to the power prediction value in S2; S4, the total energy router and the sub-energy router manage the flow of electric energy according to the actual electric energy required by the unit power grid; The power source with the same or similar power type and parameters as the user-side load is selected as the preferred power source; for voltage, current and power parameters, the one with the smallest difference is selected first, and then the ones with gradually larger differences are selected in turn; When a fault somewhere in the distribution network makes it impossible for the sub-energy router in the i-th unit grid to mobilize the input of electric energy from the total energy router, the quota originally reserved for the i-th unit grid will be evenly distributed to the unit grids adjacent to the i-th unit grid, and the adjacent unit grids will transmit electric energy to the i-th unit grid through the electric energy transmission network between the sub-energy routers.

6. A multi-level energy router coordination method according to claim 5, characterized in that: The S1 includes the following steps: S11, predicting the total electricity consumption of the user side load within one day; S12. Predict the total power generation of distributed energy in one day; S13, comparing the difference between the total power consumption and the total power generation with the difference between the storage capacity of the energy storage module and the energy storage threshold to obtain the electric energy that needs to be input from the outside.

7. A multi-level energy router coordination method according to claim 5, characterized in that: In the above S4, during the power flow management process, the priority of the power consumed by the user-side load is, from high to low, the power generated by the distributed energy, the power stored by the energy storage module, and the power input from the distribution network; The power consumption of the user-side load at time t is Pic(t), the power generation of distributed energy at time t is Pig(t), the maximum output power of the energy storage module is Pqmax, and the storage capacity of the energy storage module is Qi; When Pic(t) is less than or equal to Pig(t), the distributed energy generation fully supplies the power consumption, and the excess power flows to the energy storage module through the sub-energy router. When the energy storage module is full, the excess power is transmitted back to the distribution network. When Pic(t) is greater than Pig(t), it means that the distributed energy generation power is insufficient to cover the power consumption of all user-side loads. Therefore, the power stored in the energy storage module needs to be supplied to the user-side loads through the sub-energy router at the same time. When Pic(t) is less than or equal to Pig(t)+Pqmax, it means that the output power of distributed energy and energy storage module is sufficient to cover the energy consumption of user-side load; however, when the energy stored in the energy storage module is lower than Qi / 2, ​​the energy stored in the energy storage module is lower than the threshold set in advance. At this time, the energy storage module can no longer supply power, and the sub-energy router needs to input power from the distribution network to the unit grid to meet the consumption; When Pic(t) is greater than Pig(t)+Pqmax, it means that the output power of distributed energy and energy storage modules is not enough to cover the power consumption of user-side loads. Therefore, the sub-energy router needs to continue to input power from the distribution network to the unit grid to meet the consumption; thereby completing the control of the sub-energy router over the flow of power in the unit grid.

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