Regional balanced power supply method based on virtual power plant

Abstract

The invention provides a regional balanced power supply method based on a virtual power plant. The method comprises the following steps: S1, acquiring position information and power information of all energy monomers participating in power compensation in a region covered by the virtual power plant; s2, a power exchange network is constructed, at least one power exchange station is arranged between every two adjacent energy single bodies, the power exchange stations are connected into the virtual power plant, and the power exchange stations are electrically connected with the power grid main network; s3, the virtual power plant obtains the energy single bodies needing power compensation, and power compensation is conducted on the energy single bodies according to the shortest path principle; according to the invention, the exchange base station is arranged to realize mutual power assistance among the distributed power supplies, and local consumption of the power distribution network is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-energy power compensation, and in particular to a regional balanced power supply method based on a virtual power plant. Background Art

[0002] In order to actively respond to the external situation of energy development and the problem of interaction between sources and loads in the internal power grid, with the help of the organic integration of "Internet +" technology and smart grid technology, a new model of "virtual power plant" in the county is innovatively constructed. On the one hand, by constructing a "virtual power plant" with hierarchical and partitioned elastic balance with rapid response at the unit level, fine adjustment of the site, and comprehensive coordination at the regional level, multiple distributed energy sources are "connected in series" to achieve self-regulation of power generation and power consumption within the virtual power plant unit; on the other hand, by constructing a hierarchical and partitioned precise demand response mechanism to solve the limitation problem of local areas of the power grid, the pre-prediction, precise matching, and flexible call of distributed power sources, energy storage, load side and other resources are achieved, providing strong support for the coordinated interaction of source, grid, load and storage resources. The virtual power plant has created a regional centralized management platform for source, grid, load and storage, promoted the aggregation and coordinated optimization of various resources in the power grid, promoted the aggregation of multi-type, multi-energy flow, and multi-subject resources, achieved multi-energy complementarity on the power supply side, and flexible interaction on the load side, and achieved the effect of filling the macro traffic of the power grid like a large "power bank", empowering the traditional power grid, and further improving the operation efficiency of the power grid on the premise of ensuring the power demand of users, supporting the safe, efficient, clean and low-carbon operation of the power grid, and becoming a vivid practice of the implementation of the international leading energy Internet in the county. Large-scale access to new energy has led to insufficient local absorption capacity of distribution networks. With the large-scale access of distributed new energy to distribution networks, power reverse transmission has occurred in some areas, and distribution networks are facing great pressure to absorb new energy locally. In the future, a high proportion of distributed new energy will be connected to the distribution network, which will inevitably have an impact on the safe and stable operation of the distribution network and the large power grid. Therefore, it is necessary to further improve the distribution network's ability to absorb distributed new energy locally. Existing distributed new energy has two modes: island operation and grid-connected operation. In the island operation mode, distributed power sources and part of the load will form a self-sufficient island, and the distributed power source will independently supply power to the load.Referring to a load reduction method applied to an active distribution network with Chinese patent publication number CN104504524A, the active distribution network is in an isolated island area, including a load point, a distributed power source and a battery. The method includes: step 11: setting an initial time, an end time and a time interval, calculating the total power of the load point in the time interval when its reduction state is 1, and determining the initial time as the simulation clock time; step 12: at the currently determined simulation clock time, calculating the first net exchange power of the isolated island area, judging whether the first net exchange power is greater than 0, if not, controlling the distributed power source to charge the battery, and determining its actual absorption power in the time interval according to the battery parameters of the battery, Calculate and update the battery parameters according to the actual absorbed power, and execute step 13; if yes, determine the maximum discharge power of the battery within the time interval according to the battery parameters; judge whether the maximum discharge power meets the preset conditions, if yes, calculate the actual release power of the battery within the time interval, calculate and update the battery parameters according to the actual release power, and execute step 13; if not, determine the load point with the smallest total power, set its reduction state to 0, and execute step 13; step 13: take the sum of the simulation clock time and the time interval as the currently determined simulation clock time, execute step 12, until the simulation clock time is equal to the end time, and count and record the reduction state of the load point. The active distribution network can complement the power of the mains in the grid-connected mode, and can use the mains to charge the active distribution network for peak shaving and valley filling of the power grid. However, neither of these two modes can achieve power mutual assistance between distributed power sources, which is not conducive to local consumption of the distribution network. Summary of the invention

[0003] The present invention solves the problem that the existing distributed power supply operation mode cannot achieve power mutual assistance, and proposes a regional balanced power supply method based on a virtual power plant. By setting up a power exchange station, power mutual assistance between distributed power sources is achieved, which is beneficial to the local consumption of the distribution network.

[0004] In order to achieve the above objectives, the following technical solutions are proposed: A regional balanced power supply method based on a virtual power plant comprises the following steps: S1, obtaining the location information and power information of all energy units participating in power compensation in the area covered by the virtual power plant; S2, constructing a power exchange network, wherein at least one power exchange station is provided between two adjacent energy units, the power exchange station is connected to the virtual power plant, and the power exchange station is electrically connected to the main power grid; S3, the virtual power plant obtains the energy units that need power compensation and compensates the energy units according to the principle of shortest path.

[0005] The present invention uniformly regulates all distributed power sources within a certain area. Each distributed power source and its coverage area is regarded as an energy unit. A number of energy units are arranged in a certain area. Each energy unit is connected to a power exchange station. The power exchange station and the energy unit are connected to form an energy flow network to achieve power mutual assistance of the energy units. It is a new type of grid-connected operation mode, which is conducive to the on-site consumption of the distribution network.

[0006] Preferably, the power exchange station includes an energy storage module and a monitoring module, the energy storage module and the monitoring module are electrically connected to a main control module, and the main control module is electrically connected to a comprehensive control center.

[0007] The power exchange station includes an interface module, a commutation module, an energy storage module, a communication module, a monitoring module and a main control module. The energy storage module is connected to the interface module through the commutation module. The interface module is used to connect the external energy cell and the main power grid. The monitoring module is used to obtain the operating information of the interface module, the energy cell and the main power grid and send it to the main control module through the communication module. The commutation module and the energy storage module exchange information with the main control module through the communication module. The main control module is electrically connected to the comprehensive control center. The comprehensive control center is used to receive the power demand issued by the demand side, generate and send control instructions to the power exchange station, and control the power exchange station to charge and discharge the energy cell and the main power grid.

[0008] Preferably, S3 specifically includes the following steps: S31, obtaining the power demand of the energy unit, and determining whether the energy unit meets the power demand. If so, the energy unit supplies power by itself, if not, entering S2; S32, calculating the allocation demand and selecting candidate energy units that can participate in the allocation; S33, according to the shortest path principle, select the energy monomer that will eventually participate in the allocation from the candidate energy monomers; S34, controlling the energy units that ultimately participate in the allocation to supply power to the energy units on the demand side.

[0009] The S3 of the present invention specifically comprises the following steps: S31, obtaining the power demand of the energy unit, and then determining whether the energy unit can meet the power demand. If so, the energy unit supplies power to the load in the area. If not, it is considered that the energy unit is short of power and the process goes to S2; S32, calculating the allocation demand according to the power shortage of the load in the area corresponding to the energy unit, and selecting candidate energy units that can participate in the allocation; S33, according to the shortest path principle, select the energy monomer that will eventually participate in the allocation from the candidate energy monomers; S34, using the candidate energy cells with surplus power to perform power compensation on the energy cells that need power compensation.

[0010] The present invention reduces energy loss and increases power mutual assistance speed. Electric energy has line consumption during transmission. The longer the transmission path, the greater the consumption. The present invention selects candidate energy cells based on the principle of the shortest path, effectively avoiding energy transmission loss between energy cells. At the same time, the shorter the path, the faster the compensation speed, which can achieve rapid mutual assistance of the distribution network.

[0011] Preferably, judging whether the energy unit meets the electricity demand specifically includes the following steps: Determine whether the load power of the energy unit is greater than the load power demand. If so, it is considered that the power demand is met; if not, it is considered that the power demand is not met.

[0012] The method of judging whether an energy unit can meet the electricity demand in the present invention specifically includes the following steps: judging whether the load power of the energy unit is greater than the load power demand; if so, it is considered that the energy unit can meet the electricity demand; if not, it is considered that the energy unit does not meet the electricity demand.

[0013] Preferably, the allocation demand = load power demand - load power.

[0014] The allocation demand of the present invention is equal to the difference between the load power demand and the load power.

[0015] Preferably, the load power=the total output power of the energy unit-the operating power, and the operating power is the power required to maintain the operation of the energy unit itself.

[0016] The load power of the present invention is equal to the difference between the total output power of the energy unit and the operating power, and the operating power refers to the power required to maintain the operation of the energy unit itself.

[0017] Preferably, the load power=actual load power+surplus load power. In S2, the condition satisfying the candidate energy unit is: surplus load power>load power×20%.

[0018] The load power of the present invention is equal to the sum of the actual load power and the surplus load power. In addition, in S2, the condition for satisfying the candidate energy unit is that the surplus load power of the energy unit is greater than 20% of the load power.

[0019] Preferably, S3 specifically includes the following steps: S301, combining candidate energy units according to their surplus load powers, where the combination condition is that each combination contains at least one candidate energy unit and the sum of the surplus load powers of all candidate energy units in the combination is greater than or equal to the dispatch demand; S302, calculating the allocation paths of all combinations. If the combination contains more than two candidate energy units, the allocation path is the sum of the paths from each candidate energy unit to the energy unit on the demand side; S303, selecting a corresponding combination according to the shortest path principle, and the candidate energy monomers in the combination are the energy monomers that ultimately participate in the allocation.

[0020] The S3 of the present invention specifically comprises the following steps: S301, combining the surplus load powers of the candidate energy units according to the deployment demand, where the combination condition is that each combination contains at least one candidate energy unit, and the sum of the surplus load powers of all the candidate energy units in the combination is greater than or equal to the deployment demand; S302, calculating the allocation paths of all combinations. Assuming that the combination contains more than two candidate energy units, the allocation path is equal to the sum of the paths from each candidate energy unit to the energy unit on the demand side; S303, selecting a corresponding combination with the shortest allocation path according to the shortest path principle, and taking the candidate energy monomers in the combination as the energy monomers that ultimately participate in the allocation.

[0021] Preferably, the site selection process of the power exchange station is as follows: S21, marking coordinate points corresponding to the location information of energy cells in a certain area, connecting two coordinate points into site selection line segments, and taking the midpoints of the site selection line segments as preset power exchange station coordinate points, thereby obtaining a preset power exchange station coordinate point set; S22, each energy unit retains the shortest distance site selection line segment to obtain a set of coordinate points of the initial screening power exchange station; S23, removing power exchange stations whose adjacent distances are less than a set value from the initially screened power exchange station coordinate point set; S24, obtaining the candidate coordinates with the shortest sum of distances to the coordinate points corresponding to the location information of each energy unit, adding the candidate coordinates to the initial screening power exchange station coordinate point set and then returning to S23.

[0022] The site selection process of the power exchange station of the present invention is as follows: S21, marking the coordinate points corresponding to the location information of the energy monomers in a certain area, connecting the coordinate points in pairs to form a site selection line segment, and regarding the midpoint of the site selection line segment as a preset power exchange station coordinate point, thereby obtaining a preset power exchange station coordinate point set; S22, for each energy unit, only the site selection line segment with the shortest distance to it is retained to obtain a set of coordinate points of the initial screening power exchange station; S23, removing power exchange stations whose adjacent distances are less than a set value from the initially screened power exchange station coordinate point set; S24, obtaining candidate coordinates, the sum of the distances between the candidate coordinates and the coordinate points corresponding to the location information of each energy cell is the shortest, and adding the candidate coordinates to the initial screening power exchange station coordinate point set and then returning to S23.

[0023] Preferably, the S23 specifically includes the following steps: calculating the distance L between each power exchange station coordinate point in the preliminary screening power exchange station coordinate point set, determining whether there are two power exchange station coordinate points whose distance L is less than a set value, and if so, selecting the coordinate points corresponding to the location information of all energy cells associated with the two power exchange station coordinate points, and removing the two power exchange station coordinate points whose distance L is less than the set value from the preliminary screening power exchange station coordinate point set, and then proceeding to S24; if not, the site selection is completed, and then proceeding to S3.

[0024] The S23 of the present invention specifically includes the following steps: calculating the distance L between the coordinate points of each power exchange station in the preliminary screening power exchange station coordinate point set, first determining whether there are two coordinate points of the power exchange station with a distance L less than a set value, and if so, selecting the coordinate points corresponding to the location information of all energy cells associated with the coordinate points of the two power exchange stations, and removing the two power exchange station coordinate points with a distance L less than the set value from the preliminary screening power exchange station coordinate point set, and then proceeding to S24; if not, the site selection is completed directly, and then proceeding to S3.

[0025] The beneficial effect of the present invention is that the present invention uniformly regulates all distributed power sources within a certain area, each distributed power source and its coverage area is regarded as an energy unit, a number of energy units are arranged in a certain area, each energy unit is connected to a power exchange station, the power exchange station and the energy unit are connected to form an energy flow network, and the power mutual assistance of the energy units is realized. It is a new type of grid-connected operation mode, which is conducive to the on-site consumption of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a balanced power supply flow chart of the present invention.

[0027] Figure 2 It is a flow chart of site selection for a power exchange station of the present invention. DETAILED DESCRIPTION

[0028] Embodiment 1: This embodiment proposes a regional balanced power supply method based on a virtual power plant. Figure 1 , including the following steps: S1, obtaining the power information and location information of all energy units participating in power compensation in the area covered by the virtual power plant; S2, constructing a power exchange network for energy cells to exchange power, wherein at least one power exchange station is provided between two adjacent energy cells, wherein the power exchange station exchanges information with the virtual power plant, and the power exchange station is electrically connected to the main power grid; The power exchange station includes an interface module, a commutation module, an energy storage module, a communication module, a monitoring module and a main control module. The energy storage module is connected to the interface module through the commutation module. The interface module is used to connect the external energy cell and the main power grid. The monitoring module is used to obtain the operating information of the interface module, the energy cell and the main power grid and send it to the main control module through the communication module. The commutation module and the energy storage module exchange information with the main control module through the communication module. The main control module is electrically connected to the comprehensive control center. The comprehensive control center is used to receive the power demand issued by the demand side, generate and send control instructions to the power exchange station, and control the power exchange station to charge and discharge the energy cell and the main power grid.

[0029] S3, the virtual power plant calculates and obtains energy units that need power compensation and candidate energy units with power surplus, and uses the candidate energy units with power surplus to compensate the energy units that need power compensation according to the shortest path principle.

[0030] The S3 of the present invention specifically comprises the following steps: S31, obtaining the power demand of the energy unit, and then determining whether the energy unit can meet the power demand. If so, the energy unit supplies power to the load in the area. If not, it is considered that the energy unit is short of power and the process goes to S2; The method of judging whether an energy unit can meet the electricity demand in the present invention specifically includes the following steps: judging whether the load power of the energy unit is greater than the load power demand; if so, it is considered that the energy unit can meet the electricity demand; if not, it is considered that the energy unit does not meet the electricity demand.

[0031] S32, calculating the allocation demand according to the power shortage of the load in the area corresponding to the energy unit, and selecting candidate energy units that can participate in the allocation; S33, according to the shortest path principle, select the energy monomer that will eventually participate in the allocation from the candidate energy monomers; The allocation demand of the present invention is equal to the difference between the load power demand and the load power.

[0032] The load power of the present invention is equal to the difference between the total output power of the energy unit and the operating power, and the operating power refers to the power required to maintain the operation of the energy unit itself.

[0033] The load power of the present invention is equal to the sum of the actual load power and the surplus load power. In addition, in S2, the condition for satisfying the candidate energy unit is that the surplus load power of the energy unit is greater than 20% of the load power.

[0034] S34, using the candidate energy cells with surplus power to perform power compensation on the energy cells that need power compensation.

[0035] The present invention reduces energy loss and increases power mutual assistance speed. Electric energy has line consumption during transmission. The longer the transmission path, the greater the consumption. The present invention selects candidate energy cells based on the principle of the shortest path, effectively avoiding energy transmission loss between energy cells. At the same time, the shorter the path, the faster the compensation speed, which can achieve rapid mutual assistance of the distribution network.

[0036] The present invention uniformly regulates all distributed power sources within a certain area. Each distributed power source and its coverage area is regarded as an energy unit. A number of energy units are arranged in a certain area. Each energy unit is connected to a power exchange station. The power exchange station and the energy unit are connected to form an energy flow network to achieve power mutual assistance of the energy units. It is a new type of grid-connected operation mode, which is conducive to the on-site consumption of the distribution network.

[0037] Embodiment 2: This embodiment optimizes S33 on the basis of embodiment 1 and proposes a regional balanced power supply method based on a virtual power plant. Figure 1 , including the following steps: S1, obtaining the power information and location information of all energy units participating in power compensation in the area covered by the virtual power plant; S2, constructing a power exchange network for energy cells to exchange power, wherein at least one power exchange station is provided between two adjacent energy cells, wherein the power exchange station exchanges information with the virtual power plant, and the power exchange station is electrically connected to the main power grid; The power exchange station includes an interface module, a commutation module, an energy storage module, a communication module, a monitoring module and a main control module. The energy storage module is connected to the interface module through the commutation module. The interface module is used to connect the external energy cell and the main power grid. The monitoring module is used to obtain the operating information of the interface module, the energy cell and the main power grid and send it to the main control module through the communication module. The commutation module and the energy storage module exchange information with the main control module through the communication module. The main control module is electrically connected to the comprehensive control center. The comprehensive control center is used to receive the power demand issued by the demand side, generate and send control instructions to the power exchange station, and control the power exchange station to charge and discharge the energy cell and the main power grid.

[0038] S3, the virtual power plant calculates and obtains energy units that need power compensation and candidate energy units with power surplus, and uses the candidate energy units with power surplus to compensate the energy units that need power compensation according to the shortest path principle.

[0039] The S3 of the present invention specifically comprises the following steps: S31, obtaining the power demand of the energy unit, and then determining whether the energy unit can meet the power demand. If so, the energy unit supplies power to the load in the area. If not, it is considered that the energy unit is short of power and the process goes to S2; The method of judging whether an energy unit can meet the electricity demand in the present invention specifically includes the following steps: judging whether the load power of the energy unit is greater than the load power demand; if so, it is considered that the energy unit can meet the electricity demand; if not, it is considered that the energy unit does not meet the electricity demand.

[0040] S32, calculating the allocation demand according to the power shortage of the load in the area corresponding to the energy unit, and selecting candidate energy units that can participate in the allocation; S33, according to the shortest path principle, select the energy monomer that will eventually participate in the allocation from the candidate energy monomers; The allocation demand of the present invention is equal to the difference between the load power demand and the load power.

[0041] The load power of the present invention is equal to the difference between the total output power of the energy unit and the operating power, and the operating power refers to the power required to maintain the operation of the energy unit itself.

[0042] The load power of the present invention is equal to the sum of the actual load power and the surplus load power. In addition, in S2, the condition for satisfying the candidate energy unit is that the surplus load power of the energy unit is greater than 20% of the load power.

[0043] The S33 of the present invention specifically includes the following steps: S301, combining the surplus load powers of the candidate energy units according to the deployment demand, where the combination condition is that each combination contains at least one candidate energy unit, and the sum of the surplus load powers of all the candidate energy units in the combination is greater than or equal to the deployment demand; S302, calculating the allocation paths of all combinations. Assuming that the combination contains more than two candidate energy units, the allocation path is equal to the sum of the paths from each candidate energy unit to the energy unit on the demand side; S303, selecting a corresponding combination with the shortest allocation path according to the shortest path principle, and taking the candidate energy monomers in the combination as the energy monomers that ultimately participate in the allocation.

[0044] S34, using the candidate energy cells with surplus power to perform power compensation on the energy cells that need power compensation.

[0045] The present invention reduces energy loss and increases power mutual assistance speed. Electric energy has line consumption during transmission. The longer the transmission path, the greater the consumption. The present invention selects candidate energy cells based on the principle of the shortest path, effectively avoiding energy transmission loss between energy cells. At the same time, the shorter the path, the faster the compensation speed, which can achieve rapid mutual assistance of the distribution network.

[0046] The present invention uniformly regulates all distributed power sources within a certain area. Each distributed power source and its coverage area is regarded as an energy unit. A number of energy units are arranged in a certain area. Each energy unit is connected to a power exchange station. The power exchange station and the energy unit are connected to form an energy flow network to achieve power mutual assistance of the energy units. It is a new type of grid-connected operation mode, which is conducive to the on-site consumption of the distribution network.

[0047] Embodiment 3: This embodiment optimizes the location of the power exchange station in S2 on the basis of embodiment 2, and proposes a regional balanced power supply method based on a virtual power plant. Figure 1 , including the following steps: S1, obtaining the power information and location information of all energy units participating in power compensation in the area covered by the virtual power plant; S2, constructing a power exchange network for energy cells to exchange power, wherein at least one power exchange station is provided between two adjacent energy cells, wherein the power exchange station exchanges information with the virtual power plant, and the power exchange station is electrically connected to the main power grid; The power exchange station includes an interface module, a commutation module, an energy storage module, a communication module, a monitoring module and a main control module. The energy storage module is connected to the interface module through the commutation module. The interface module is used to connect the external energy cell and the main power grid. The monitoring module is used to obtain the operating information of the interface module, the energy cell and the main power grid and send it to the main control module through the communication module. The commutation module and the energy storage module exchange information with the main control module through the communication module. The main control module is electrically connected to the comprehensive control center. The comprehensive control center is used to receive the power demand issued by the demand side, generate and send control instructions to the power exchange station, and control the power exchange station to charge and discharge the energy cell and the main power grid.

[0048] refer to Figure 2 , the site selection process of the power exchange station of the present invention is as follows: S21, marking the coordinate points corresponding to the location information of the energy monomers in a certain area, connecting two coordinate points to form a site selection line segment, and regarding the midpoint of the site selection line segment as a preset power exchange station coordinate point, thereby obtaining a preset power exchange station coordinate point set; S22, for each energy unit, only the site selection line segment with the shortest distance to it is retained to obtain a set of coordinate points of the initial screening power exchange station; S23, removing power exchange stations whose adjacent distances are less than a set value from the initially screened power exchange station coordinate point set; S24, obtaining candidate coordinates, the sum of the distances between the candidate coordinates and the coordinate points corresponding to the location information of each energy cell is the shortest, and adding the candidate coordinates to the initial screening power exchange station coordinate point set and then returning to S23.

[0049] S3, the virtual power plant calculates and obtains energy units that need power compensation and candidate energy units with power surplus, and uses the candidate energy units with power surplus to compensate the energy units that need power compensation according to the shortest path principle.

[0050] The S3 of the present invention specifically comprises the following steps: S31, obtaining the power demand of the energy unit, and then determining whether the energy unit can meet the power demand. If so, the energy unit supplies power to the load in the area. If not, it is considered that the energy unit is short of power and the process goes to S2; The method of judging whether an energy unit can meet the electricity demand in the present invention specifically includes the following steps: judging whether the load power of the energy unit is greater than the load power demand; if so, it is considered that the energy unit can meet the electricity demand; if not, it is considered that the energy unit does not meet the electricity demand.

[0051] S32, calculating the allocation demand according to the power shortage of the load in the area corresponding to the energy unit, and selecting candidate energy units that can participate in the allocation; S33, according to the shortest path principle, select the energy monomer that will eventually participate in the allocation from the candidate energy monomers; The allocation demand of the present invention is equal to the difference between the load power demand and the load power.

[0052] The load power of the present invention is equal to the difference between the total output power of the energy unit and the operating power, and the operating power refers to the power required to maintain the operation of the energy unit itself.

[0053] The load power of the present invention is equal to the sum of the actual load power and the surplus load power. In addition, in S2, the condition for satisfying the candidate energy unit is that the surplus load power of the energy unit is greater than 20% of the load power.

[0054] The S33 of the present invention specifically includes the following steps: S301, combining the surplus load powers of the candidate energy units according to the deployment demand, where the combination condition is that each combination contains at least one candidate energy unit, and the sum of the surplus load powers of all the candidate energy units in the combination is greater than or equal to the deployment demand; S302, calculating the allocation paths of all combinations. Assuming that the combination contains more than two candidate energy units, the allocation path is equal to the sum of the paths from each candidate energy unit to the energy unit on the demand side; S303, selecting a corresponding combination with the shortest allocation path according to the shortest path principle, and taking the candidate energy monomers in the combination as the energy monomers that ultimately participate in the allocation.

[0055] S34, using the candidate energy cells with surplus power to perform power compensation on the energy cells that need power compensation.

[0056] The present invention reduces energy loss and increases power mutual assistance speed. Electric energy has line consumption during transmission. The longer the transmission path, the greater the consumption. The present invention selects candidate energy cells based on the principle of the shortest path, effectively avoiding energy transmission loss between energy cells. At the same time, the shorter the path, the faster the compensation speed, which can achieve rapid mutual assistance of the distribution network.

[0057] The present invention uniformly regulates all distributed power sources within a certain area. Each distributed power source and its coverage area is regarded as an energy unit. A number of energy units are arranged in a certain area. Each energy unit is connected to a power exchange station. The power exchange station and the energy unit are connected to form an energy flow network to achieve power mutual assistance of the energy units. It is a new type of grid-connected operation mode, which is conducive to the on-site consumption of the distribution network.

[0058] Embodiment 4: This embodiment optimizes S23 on the basis of embodiment 3, and proposes a regional balanced power supply method based on a virtual power plant. Figure 1 , including the following steps: S1, obtaining the power information and location information of all energy units participating in power compensation in the area covered by the virtual power plant; S2, constructing a power exchange network for energy cells to exchange power, wherein at least one power exchange station is provided between two adjacent energy cells, wherein the power exchange station exchanges information with the virtual power plant, and the power exchange station is electrically connected to the main power grid; The power exchange station includes an interface module, a commutation module, an energy storage module, a communication module, a monitoring module and a main control module. The energy storage module is connected to the interface module through the commutation module. The interface module is used to connect the external energy cell and the main power grid. The monitoring module is used to obtain the operating information of the interface module, the energy cell and the main power grid and send it to the main control module through the communication module. The commutation module and the energy storage module exchange information with the main control module through the communication module. The main control module is electrically connected to the comprehensive control center. The comprehensive control center is used to receive the power demand issued by the demand side, generate and send control instructions to the power exchange station, and control the power exchange station to charge and discharge the energy cell and the main power grid.

[0059] refer to Figure 2 , the site selection process of the power exchange station of the present invention is as follows: S21, marking the coordinate points corresponding to the location information of the energy monomers in a certain area, connecting two coordinate points to form a site selection line segment, and regarding the midpoint of the site selection line segment as a preset power exchange station coordinate point, thereby obtaining a preset power exchange station coordinate point set; S22, for each energy unit, only the site selection line segment with the shortest distance to it is retained to obtain a set of coordinate points of the initial screening power exchange station; S23, removing power exchange stations whose adjacent distances are less than a set value from the initial screening power exchange station coordinate point set; the S23 of the present invention specifically includes the following steps: Calculate the distance L between the coordinate points of each power exchange station in the initially screened power exchange station coordinate point set, first determine whether there are two coordinate points of the power exchange station with a distance L less than a set value, if so, select the coordinate points corresponding to the position information of all energy cells associated with the coordinate points of the two power exchange stations, and remove the two coordinate points of the power exchange station with a distance L less than the set value from the initially screened power exchange station coordinate point set, and then proceed to S24; if not, the site selection is completed directly, and then proceed to S3.

[0060] S24, obtaining candidate coordinates, the sum of the distances between the candidate coordinates and the coordinate points corresponding to the location information of each energy cell is the shortest, and adding the candidate coordinates to the initial screening power exchange station coordinate point set and then returning to S23.

[0061] S3, the virtual power plant calculates and obtains energy units that need power compensation and candidate energy units with power surplus, and uses the candidate energy units with power surplus to compensate the energy units that need power compensation according to the shortest path principle.

[0062] The S3 of the present invention specifically comprises the following steps: S31, obtaining the power demand of the energy unit, and then determining whether the energy unit can meet the power demand. If so, the energy unit supplies power to the load in the area. If not, it is considered that the energy unit is short of power and the process goes to S2; The method of judging whether an energy unit can meet the electricity demand in the present invention specifically includes the following steps: judging whether the load power of the energy unit is greater than the load power demand; if so, it is considered that the energy unit can meet the electricity demand; if not, it is considered that the energy unit does not meet the electricity demand.

[0063] S32, calculating the allocation demand according to the power shortage of the load in the area corresponding to the energy unit, and selecting candidate energy units that can participate in the allocation; S33, according to the shortest path principle, select the energy monomer that will eventually participate in the allocation from the candidate energy monomers; The allocation demand of the present invention is equal to the difference between the load power demand and the load power.

[0064] The load power of the present invention is equal to the difference between the total output power of the energy unit and the operating power, and the operating power refers to the power required to maintain the operation of the energy unit itself.

[0065] The load power of the present invention is equal to the sum of the actual load power and the surplus load power. In addition, in S2, the condition for satisfying the candidate energy unit is that the surplus load power of the energy unit is greater than 20% of the load power.

[0066] The S33 of the present invention specifically includes the following steps: S301, combining the surplus load powers of the candidate energy units according to the deployment demand, where the combination condition is that each combination contains at least one candidate energy unit, and the sum of the surplus load powers of all the candidate energy units in the combination is greater than or equal to the deployment demand; S302, calculating the allocation paths of all combinations. Assuming that the combination contains more than two candidate energy units, the allocation path is equal to the sum of the paths from each candidate energy unit to the energy unit on the demand side; S303, selecting a corresponding combination with the shortest allocation path according to the shortest path principle, and taking the candidate energy monomers in the combination as the energy monomers that ultimately participate in the allocation.

[0067] S34, using the candidate energy cells with surplus power to perform power compensation on the energy cells that need power compensation.

[0068] The present invention reduces energy loss and increases power mutual assistance speed. Electric energy has line consumption during transmission. The longer the transmission path, the greater the consumption. The present invention selects candidate energy cells based on the principle of the shortest path, effectively avoiding energy transmission loss between energy cells. At the same time, the shorter the path, the faster the compensation speed, which can achieve rapid mutual assistance of the distribution network.

[0069] The present invention uniformly regulates all distributed power sources within a certain area. Each distributed power source and its coverage area is regarded as an energy unit. A number of energy units are arranged in a certain area. Each energy unit is connected to a power exchange station. The power exchange station and the energy unit are connected to form an energy flow network to achieve power mutual assistance of the energy units. It is a new type of grid-connected operation mode, which is conducive to the on-site consumption of the distribution network.

Claims

1. A regional balanced power supply method based on a virtual power plant, characterized in that: The following steps are involved: S1, obtaining the location information and power information of all energy units participating in power compensation in the area covered by the virtual power plant; S2, constructing a power exchange network, wherein at least one power exchange station is provided between two adjacent energy units, the power exchange station is connected to the virtual power plant, and the power exchange station is electrically connected to the main power grid; S3, the virtual power plant obtains the energy units that need power compensation and compensates the energy units according to the principle of shortest path.

2. According to claim 1, a regional balanced power supply method based on a virtual power plant is characterized in that: The power exchange station includes an energy storage module and a monitoring module, wherein the energy storage module and the monitoring module are electrically connected to a main control module, and the main control module is electrically connected to a comprehensive control center.

3. According to claim 1, a regional balanced power supply method based on a virtual power plant is characterized in that: The S3 specifically includes the following steps: S31, obtaining the power demand of the energy unit, and determining whether the energy unit meets the power demand. If so, the energy unit supplies power by itself, if not, entering S2; S32, calculating the allocation demand and selecting candidate energy units that can participate in the allocation; S33, according to the shortest path principle, select the energy monomer that will eventually participate in the allocation from the candidate energy monomers; S34, controlling the energy units that ultimately participate in the allocation to supply power to the energy units on the demand side.

4. According to claim 3, a regional balanced power supply method based on a virtual power plant is characterized in that: Determining whether the energy unit meets the electricity demand specifically includes the following steps: Determine whether the load power of the energy unit is greater than the load power demand. If so, it is considered that the power demand is met; if not, it is considered that the power demand is not met.

5. According to claim 3, a regional balanced power supply method based on a virtual power plant is characterized in that: The allocation demand=load power demand-load power.

6. A regional balanced power supply method based on a virtual power plant according to claim 4 or 5, characterized in that: The load power = the total output power of the energy unit - the operating power, and the operating power is the power required to maintain the operation of the energy unit itself.

7. A regional balanced power supply method based on a virtual power plant according to claim 6, characterized in that: The load power=actual load power+surplus load power. In S2, the condition for satisfying the candidate energy unit is: surplus load power>load power×20%.

8. A regional balanced power supply method based on a virtual power plant according to claim 7, characterized in that: The S33 specifically includes the following steps: S301, combining candidate energy units according to their surplus load powers, where the combination condition is that each combination contains at least one candidate energy unit and the sum of the surplus load powers of all candidate energy units in the combination is greater than or equal to the dispatch demand; S302, calculating the allocation paths of all combinations. If the combination contains more than two candidate energy units, the allocation path is the sum of the paths from each candidate energy unit to the energy unit on the demand side; S303, selecting a corresponding combination according to the shortest path principle, and the candidate energy monomers in the combination are the energy monomers that ultimately participate in the allocation.

9. The regional balanced power supply method based on a virtual power plant according to claim 1 is characterized in that: The site selection process of the power exchange station is as follows: S21, marking coordinate points corresponding to the location information of energy cells in a certain area, connecting two coordinate points into site selection line segments, and taking the midpoints of the site selection line segments as preset power exchange station coordinate points, thereby obtaining a preset power exchange station coordinate point set; S22, each energy unit retains the shortest distance site selection line segment to obtain a set of coordinate points of the initial screening power exchange station; S23, removing power exchange stations whose adjacent distances are less than a set value from the initially screened power exchange station coordinate point set; S24, obtaining the candidate coordinates with the shortest sum of distances to the coordinate points corresponding to the location information of each energy unit, adding the candidate coordinates to the initial screening power exchange station coordinate point set and then returning to S23.

10. A regional balanced power supply method based on a virtual power plant according to claim 9, characterized in that: The S23 specifically includes the following steps: calculating the distance L between the coordinate points of each power exchange station in the initially screened power exchange station coordinate point set, determining whether there are two power exchange station coordinate points with a distance L less than a set value, and if so, selecting the coordinate points corresponding to the location information of all energy cells associated with the two power exchange station coordinate points, and removing the two power exchange station coordinate points with a distance L less than the set value from the initially screened power exchange station coordinate point set, and then proceeding to S24; if not, the site selection is completed, and then proceeding to S3.

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