A multi-energy complementary energy storage passive charging station

Abstract

The present disclosure relates to the technical field of new energy equipment, in particular to a multi-energy complementary energy storage passive charging station, comprising energy supply units, regional energy collection units, collection conversion units, energy storage units, charging load units and power distribution units; each energy supply unit is connected to a corresponding regional energy collection unit, adjacent regional energy collection units are switched between independent power supply state and joint power supply state through the collection conversion unit, and the energy storage unit is connected to the joint power supply path through a common compensation branch; through the regional energy collection mode, different energies are first organized in the corresponding region to form a cross-regional power supply path when needed; the energy storage unit only participates in the compensation process in the joint power supply path, reducing the situation that the energy storage frequently participates in the dynamic balance of each energy, and the present disclosure is suitable for photovoltaic, wind power generation, external power distribution grid and energy storage collaborative power supply charging station.

Description

Technical Field

[0001] This disclosure relates to the field of new energy equipment technology, and more specifically to a multi-energy complementary energy storage passive charging station. Background Technology

[0002] With the increasing application of distributed new energy and energy storage equipment in power distribution systems, multi-energy complementary energy storage passive charging stations typically connect photovoltaic power generation, wind power generation, energy storage devices, and external power distribution networks to the same power supply system. After the power is collected through box-type substations or distribution units, it supplies power to charging loads or other electrical equipment. In existing projects, in order to facilitate the unified access and operation management of different energy sources, most adopt a common bus to collect multiple power sources, and then cooperate with energy storage devices to complete power balance, so that each energy source can participate in power supply according to the output situation.

[0003] While the above methods can achieve multi-energy coordinated operation, in actual operation, the output power of different energy sources is affected by environmental changes and load fluctuations, and their changes are usually asynchronous. After the energy sources are gathered through the common bus, even if the overall system supply and demand remain basically balanced, the common bus will still experience short-term power deviations due to differences in the dynamic responses of each power source. The energy storage device needs to continuously participate in compensation to maintain the stability of the power supply on the bus side. This compensation process mostly manifests as frequent charging and discharging with small amplitude and short duration. Over long-term operation, this increases the number of ineffective cycles of the energy storage device and gradually transforms the energy storage from a standby regulating unit into a working unit that continuously participates in the dynamic balancing of the system. Furthermore, since existing systems typically use the common bus as a common energy transfer node for multiple energy sources, each energy source regulates its power around the same bus, making it difficult for the energy storage device to withdraw from the real-time energy coordination process. The above phenomena mainly stem from the coupling mode of the system's energy transfer path, and it is difficult to fundamentally reduce the unnecessary participation of energy storage simply by optimizing existing control strategies. Summary of the Invention

[0004] This disclosure provides a multi-energy complementary energy storage passive charging station, which aims to solve the problems mentioned in the background art.

[0005] This disclosure provides a multi-energy complementary energy storage passive charging station, including at least two energy supply units, at least one energy storage unit, multiple charging load units, and a power distribution unit. The power distribution unit includes multiple regional energy aggregation units respectively set for each energy supply unit. Each energy supply unit is connected to its corresponding regional energy aggregation unit, and each charging load unit can selectively connect to any regional energy aggregation unit. An aggregation conversion unit is provided between adjacent regional energy aggregation units. The aggregation conversion unit is used to switch the multiple regional energy aggregation units between an independent regional power supply state and an interconnected joint power supply state. The energy storage unit is connected to the aggregation conversion unit via a common compensation branch, so that the energy storage unit is disconnected from each regional energy aggregation unit when the regional energy aggregation unit is in a regional power supply state, and connected to the interconnected regional energy aggregation unit via the common compensation branch when multiple regional energy aggregation units are in a joint power supply state.

[0006] In one aspect of this disclosure, the regional energy aggregation unit is disposed between the corresponding power supply unit and the charging load unit, including a source-side aggregation terminal connected to the power supply unit, a load-side power supply terminal connected to the charging load unit, and a regional communication terminal for establishing a power exchange connection with an adjacent regional energy aggregation unit. The source-side aggregation terminal, the load-side power supply terminal, and the regional communication terminal are respectively connected through independent conductive paths, and a regional power supply control component is disposed between the source-side aggregation terminal and the load-side power supply terminal corresponding to any regional energy aggregation unit.

[0007] In one aspect of this disclosure, adjacent regional energy aggregation units are connected to an aggregation conversion unit via a regional communication terminal. No continuously connected common power supply bus is provided between multiple regional energy aggregation units. When the aggregation conversion unit is disconnected, each regional energy aggregation unit forms an independent power supply area. When the aggregation conversion unit is connected, a cross-regional power supply path is formed between adjacent regional energy aggregation units.

[0008] In one aspect of this disclosure, the aggregation conversion unit includes a first regional communication interface and a second regional communication interface respectively connecting two adjacent regional energy aggregation units, a regional communication conduction component disposed between the first regional communication interface and the second regional communication interface, and a compensation access interface connected to the regional communication conduction component; the regional communication conduction component is used to form an electrical connection path between the first regional communication interface and the second regional communication interface, and the compensation access interface is located on the electrical connection path between the first regional communication interface and the second regional communication interface.

[0009] In one aspect of this disclosure, an energy storage access branch is provided between the compensation access interface and the energy storage unit. The energy storage access branch includes an energy storage side connection end, a compensation side connection end, and an energy storage isolation component disposed between the energy storage side connection end and the compensation side connection end. The energy storage side connection end is connected to the energy storage unit, the compensation side connection end is connected to the compensation access interface, and the energy storage access branch is not connected to the source side connection end and the load side power supply end of any regional energy aggregation unit.

[0010] In one aspect of this disclosure, the charging station further includes a power supply status acquisition component disposed in each regional energy aggregation unit and a regional power supply management unit connected to the aggregation conversion unit; the power supply status acquisition component acquires power supply parameter information of the corresponding regional energy aggregation unit respectively, and the regional power supply management unit establishes regional power supply status information according to the power supply parameter information corresponding to each regional energy aggregation unit, and controls the corresponding aggregation conversion unit to form a regional independent power supply status or a regional joint power supply status according to the regional power supply status information; wherein, the regional joint power supply status is formed by at least two regional energy aggregation units establishing a joint power supply path through the corresponding aggregation conversion unit.

[0011] In one aspect of this disclosure, the regional power supply management unit is further configured to acquire joint power supply parameter information corresponding to the regional joint power supply state when multiple regional energy aggregation units are in a regional joint power supply state, and control the energy storage access branch corresponding to the energy storage unit to enter a compensation connection state according to the joint power supply parameter information; when the energy storage access branch enters the compensation connection state, the energy storage unit is connected to the joint power supply path corresponding to the aggregation conversion unit via a common compensation branch, while when the regional energy aggregation unit is in a regional independent power supply state, the energy storage access branch is kept disconnected from the regional energy aggregation unit.

[0012] In one aspect of this disclosure, the regional power supply management unit establishes source-side power supply status information based on the power supply parameter information corresponding to each regional energy aggregation unit, including: Obtain energy type information, output power information and energy status information of corresponding regional energy aggregation units for each energy supply unit. The energy type information includes at least photovoltaic power generation type, wind power generation type and external power distribution network type. Based on the energy type information, the regional identifiers of each energy supply unit are matched, and the output information of the energy supply unit corresponding to the same energy type is associated with the corresponding regional energy aggregation unit to obtain a set of regional energy supply information. Based on the set of regional energy supply information and the load access status information of each regional energy aggregation unit, regional power supply status information is generated. The regional power supply status information includes at least the regional identifier, energy source identifier, regional output capacity information, and regional load occupancy information. Based on the regional power supply status information, the power supply path corresponding to each regional energy aggregation unit is kept as an independent power supply path, or multiple regional energy aggregation units are switched to a joint power supply path through the corresponding aggregation conversion unit.

[0013] In one aspect of this disclosure, the regional power supply management unit controls the energy storage unit to enter a compensated connection state, including: Based on the regional power supply status information corresponding to multiple regional energy aggregation units in a joint power supply state, the target regional energy aggregation units participating in the joint power supply are determined, and a joint power supply regional set is obtained. The joint power supply regional set includes at least two regional energy aggregation units that have established an electrical connection relationship through aggregation conversion units. Obtain the joint power supply status information corresponding to the set of joint power supply areas, and determine the corresponding common compensation access location based on the joint power supply status information. The common compensation access location is located on the joint power supply path formed by the junction conversion unit. Control the connection of the energy storage access branch corresponding to the public compensation access location, so that the energy storage unit can be connected to the joint power supply path corresponding to the joint power supply area set via the public compensation branch; When the regional energy aggregation unit switches from a joint power supply state to an independent power supply state, the corresponding energy storage access branch is disconnected, causing the energy storage unit to exit the power supply path corresponding to the regional energy aggregation unit.

[0014] In one aspect of this disclosure, the regional power supply management unit is further configured to isolate the regional connection terminal and load access terminal corresponding to the abnormal region when the power supply path corresponding to any regional energy aggregation unit in the set of joint power supply regions is abnormal, including: Obtain the power supply status information corresponding to the energy aggregation unit of each region in the set of joint power supply regions, and determine the energy aggregation unit of abnormal regions; The regional communication terminal corresponding to the abnormal area energy aggregation unit is disconnected, causing the abnormal area energy aggregation unit to exit the joint power supply path, while maintaining the joint power supply relationship formed between other area energy aggregation units through the aggregation conversion unit; Based on the regional power supply status information corresponding to the remaining regional energy aggregation units, a new set of joint power supply areas is established, and the energy storage units are connected to the newly established joint power supply path via the common compensation branch. When the energy aggregation unit in the abnormal area resumes power supply, the restored energy aggregation unit will be reconnected to the joint power supply path via the corresponding area connection terminal.

[0015] Compared to existing power supply methods that aggregate multiple energy sources through a common bus and rely on energy storage for continuous regulation, this disclosure sets up multiple regional energy aggregation units and uses aggregation conversion units to switch between independent regional power supply and joint power supply states. This allows different energy sources, such as photovoltaic, wind power, and external distribution grids, to first aggregate energy within their respective regions and then form a cross-regional joint power supply path according to power supply organization needs. Simultaneously, energy storage units are placed in the common compensation path of the joint power supply layer, preventing energy storage from directly participating in the daily power exchange process between regional energy supply units. This reduces the frequent compensation needs of energy storage due to instantaneous differences among multiple energy sources, minimizes unnecessary energy storage cycles, and improves the effective utilization of energy storage units during charging station operation. Furthermore, through regionalized energy organization, different types of energy supply units, charging load units, and energy storage units form a hierarchical connection. When the output of some energy supply units fluctuates or the regional operating status changes, regional isolation and joint power supply path adjustments can maintain the power supply organization of other regions, avoiding the continuous impact of single energy fluctuations on the overall power supply network under the traditional common bus structure. This improves the adaptability of multi-energy charging stations under complex operating conditions.

[0016] In addition, this disclosure adopts regional energy aggregation units as the basic power supply nodes for access to new energy sources, the power grid and loads. Different energy units can be modularly configured through corresponding regional interfaces, enabling the charging station to increase or adjust the power supply units and load units according to the actual construction scale, without having to rebuild the overall public bus structure, which facilitates the engineering deployment and subsequent expansion of multi-energy complementary charging stations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This schematic diagram illustrates the overall structure of the multi-energy complementary energy storage passive charging station provided in this disclosure. Figure 2 A schematic diagram of the regionalized power supply topology provided in this disclosure is shown. Figure 3 This schematic diagram illustrates the operation of the regional energy aggregation unit provided in this disclosure when it is in a regional independent power supply state; Figure 4 The schematic diagram illustrates the joint power supply path and common compensation path after the regional energy aggregation unit provided in this disclosure forms a joint power supply state. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0019] To enable those skilled in the art to better understand the present application, and in conjunction with the specific application environment architecture or specific hardware architecture upon which a multi-energy complementary energy storage passive charging station depends, the specific application environment architecture or specific hardware architecture of this disclosure will first be described and explained.

[0020] In one specific implementation scenario, the multi-energy complementary energy storage passive charging station described in this disclosure is applied to a comprehensive energy supply scenario that includes distributed new energy supply, energy storage regulation, and charging load power supply needs. Its overall hardware architecture includes an energy supply side, a power distribution side, an energy storage side, and a load side. The energy supply side includes at least photovoltaic power generation units, wind power generation units, and an external power grid interface, with each energy supply unit providing a corresponding type of electrical energy input. The power distribution side includes multiple regional energy aggregation units and aggregation conversion units located between adjacent regional energy aggregation units. Each regional energy aggregation unit serves as an electrical connection node for energy input, load output, and inter-regional energy exchange within its corresponding energy supply area. The energy storage side includes energy storage units and a common compensation branch connected to the aggregation conversion unit, used to participate in energy compensation when forming a joint power supply path. The load side includes multiple charging load units, each charging load unit connecting to the regional energy aggregation unit through a corresponding load access path.

[0021] Furthermore, to realize the aforementioned multi-level power supply organization process, this disclosure also includes a regional power supply management unit connected to the energy aggregation unit, aggregation conversion unit, and energy storage access branch of each region, and configured with energy supply status acquisition components, load status acquisition components, and energy storage status acquisition components to obtain the energy supply status, load status, and energy storage status information corresponding to each energy supply region. It should be noted that the basic working principles of energy supply parameter acquisition, energy storage status detection, and power conversion equipment have been described in detail in existing technologies and will not be repeated here.

[0022] Existing multi-energy complementary charging stations typically employ a common bus convergence mode, connecting photovoltaic power generation, wind power generation, external power distribution grid, and energy storage devices to the same energy exchange node. The energy storage devices then adjust for power deviations arising from fluctuations in energy output and load changes in real time. Under this approach, because each energy output change path is coupled to the common bus, even small changes in a single energy source can create transient power disturbances acting on the common bus, requiring the energy storage devices to continuously participate in the system's dynamic balancing process.

[0023] Unlike the aforementioned energy organization methods based on a common bus, this disclosure does not achieve power balance by increasing energy storage regulation capacity or optimizing a single control strategy. Instead, it reconstructs the energy transfer path of multiple energy sources within the charging station. Specifically, this disclosure sets up multiple regional energy aggregation units, allowing different energy sources to first enter the corresponding regional power supply layer, completing the power supply organization between energy and load within the region. When there is a joint power supply demand between multiple regions, a cross-regional joint power supply path is formed through aggregation and conversion units, and energy storage units are set in the common compensation path corresponding to this joint power supply path.

[0024] In other words, this disclosure transforms the power supply logic of "multiple energy sources coupled together to a common bus" in traditional technology into a power supply logic organized in a hierarchical manner as "regional power supply layer, joint power supply layer, and energy storage compensation layer". Among them, the regional energy aggregation unit defines the initial range of each energy source, the aggregation and conversion unit defines the conditions for the formation of energy exchange between regions, and the common compensation branch defines the positional relationship of energy storage participating in energy regulation. Together, these three constitute an energy transfer architecture that is different from the existing common bus structure.

[0025] In practical implementation, the technical effect of the above-mentioned structural relationship does not stem from the addition of a single component, but from the coordinated constraints between multiple electrical levels. Since the energy storage unit is not directly connected to each regional energy supply layer, but only participates in compensation when a joint power supply path is formed between regions, short-term changes in the output of new energy sources within a region will not directly drive the energy storage unit to respond synchronously. The adjustment target of the energy storage unit changes from all transient differences in energy under the traditional common bus to the overall energy deviation under joint power supply conditions, thereby reducing the number of times the energy storage unit participates in unnecessary dynamic adjustments.

[0026] Furthermore, the hierarchical power supply structure formed by regional energy aggregation units and aggregation conversion units ensures that when there are output changes or operational status adjustments in a certain energy supply area, these changes are initially confined to the corresponding area and only enter the joint power supply layer when cross-regional coordination is required. This reduces the direct impact of differences in the dynamic characteristics of different energy sources on the overall power supply organization of the charging station. Simultaneously, since each energy source, load, and energy storage unit is modularly configured through corresponding regional interfaces, the charging station can add or adjust energy supply units according to the actual construction scale without altering the overall common bus structure.

[0027] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, illustrates the detailed implementation process of the multi-energy complementary energy storage passive charging station described in this disclosure. For details, please refer to... Figure 1 The image shows a multi-energy complementary energy storage passive charging station, comprising multiple energy supply units, multiple regional energy aggregation units, aggregation and conversion units, energy storage units, multiple charging load units, and a regional power supply management unit. Each energy supply unit is connected to a corresponding regional energy aggregation unit. Each regional energy aggregation unit is used to collect electrical energy from its corresponding energy supply unit and control the regional power supply, and establishes a power supply connection with its corresponding charging load unit. Figure 1 In this system, adjacent energy aggregation units are connected via aggregation conversion units, and there is no continuously connected common power supply bus between the energy aggregation units in each region. When the aggregation conversion unit is disconnected, each energy aggregation unit forms an independent power supply area; when the aggregation conversion unit is connected, adjacent energy aggregation units form a joint power supply path to achieve coordinated power supply between multiple energy supply areas.

[0028] Furthermore, the energy storage unit is connected to the corresponding compensation access interface of the aggregation conversion unit via a common compensation branch, rather than directly connected to the source-side aggregation terminal or load-side power supply terminal of each regional energy aggregation unit. It should be noted that the common compensation branch is used to establish the compensation connection between the energy storage unit and the joint power supply path, and is not intended as a common power supply bus for multiple energy supply units; those skilled in the art will understand this. Figure 1 This diagram is primarily used to illustrate the overall power supply architecture and the connection relationships between various functional units. The number of energy supply units, regional energy aggregation units, and charging load units shown in the diagram are for illustrative purposes only and can be adjusted in actual projects based on the scale of the charging station, the type of energy supply, and the load configuration, without affecting the implementation methods of regional independent power supply and regional joint power supply described in this disclosure. Subsequent implementation methods are all based on... Figure 1 The overall architecture shown is explained in detail below. The same structures and connections will not be repeated.

[0029] It should be noted that the energy supply unit in this disclosure is not limited to a single type of energy equipment; it can be photovoltaic power generation equipment, wind power generation equipment, external power distribution network interface, or other energy supply equipment capable of providing electrical input. Each energy supply unit corresponds to a regional energy aggregation unit, so that different energy sources have corresponding regional access nodes when entering the internal power supply network of the charging station, rather than being directly connected to the same public energy exchange node.

[0030] In implementation, the regional energy aggregation unit acts as an energy organization node within its corresponding energy supply area. One side connects to the corresponding energy supply unit to receive energy input, while the other side connects to the charging load unit to provide a power supply interface to the charging load within the corresponding area. Simultaneously, the regional energy aggregation unit also retains connection interfaces for energy exchange with other regional energy aggregation units, enabling the establishment of a joint power supply path when cross-regional power supply is required. It should be noted that the regional power supply state described in this disclosure does not mean that the energy supply units cease supplying energy to other areas, but rather that under the current operating state, there is no continuous power supply path formed by the aggregation and conversion unit between the various regional energy aggregation units. Each energy supply unit primarily supplies energy to its corresponding charging load unit via the corresponding regional energy aggregation unit. In this state, different energy supply areas maintain a relatively independent energy organization relationship.

[0031] Accordingly, the joint power supply state described in this disclosure refers to the establishment of an electrical connection between at least two regional energy aggregation units through corresponding aggregation conversion units, transforming previously independent regional power supply paths into a continuous joint power supply path. In this state, multiple energy supply areas can exchange electrical energy to meet cross-regional power supply needs. It should be noted that the aggregation conversion unit is not used to replace the traditional common bus, but rather serves as a controllable connection node between regions. Unlike existing technologies that connect photovoltaic power generation, wind power generation, power distribution networks, and energy storage devices to the same common bus for extended periods, this disclosure organizes different energy sources into different regions through multiple regional energy aggregation units, establishing inter-regional energy exchange relationships only when needed through aggregation conversion units, thereby changing the fixed coupling method between multiple energy sources.

[0032] In practice, multiple charging load units can choose to connect to any regional energy aggregation unit according to their actual power supply needs. For example, when the power supply capacity of a certain region can meet the needs of the corresponding charging load, the charging load unit can remain connected to the energy aggregation unit of that region; when multiple regions need to coordinate power supply, a joint power supply path can be established through the aggregation conversion unit, so that charging loads connected to different regions can share the power provided by multiple power supply regions.

[0033] Furthermore, the energy storage unit in this disclosure is not directly connected to the power supply side of each regional energy aggregation unit, but is connected to the corresponding location of the aggregation conversion unit via a common compensation branch. That is, the energy exchange object of the energy storage unit is the regional joint power supply path, not the local power supply path corresponding to any one regional energy supply unit. This connection method gives the energy storage unit a clear operational hierarchy. When multiple regional energy aggregation units are in an independent regional power supply state, the aggregation conversion unit does not form a joint power supply path, and the energy storage unit remains disconnected from each regional energy aggregation unit. When multiple regional energy aggregation units form a joint power supply state through the aggregation conversion unit, the energy storage unit connects to the connected regional joint power supply path via the common compensation branch to participate in energy compensation during the joint power supply process.

[0034] Therefore, in practice, the multi-energy complementary energy storage passive charging station does not continuously balance the output differences between all energy supply units through the energy storage unit. Instead, it organizes the energy input, regional power supply and energy storage compensation process in a hierarchical manner through the coordination between regional energy aggregation units, aggregation conversion units and energy storage access paths, so that different energy supply areas can choose to operate independently or jointly according to the actual operating status.

[0035] As an example, see Figure 2 As shown, multiple energy supply units are each assigned to an independent regional energy aggregation unit. For example, a photovoltaic power generation unit corresponds to the first energy supply area, a wind power generation unit corresponds to the second energy supply area, and an external power distribution network corresponds to the third energy supply area. Each energy supply unit is connected to its corresponding regional energy aggregation unit via a corresponding source-side aggregation terminal. Those skilled in the art will understand that the diagram uses three typical energy supply units as examples. In actual projects, diesel generators, fuel cells, or other new energy supply equipment can be configured according to site construction needs, and their connection methods are consistent with this disclosure, which will not be elaborated here.

[0036] In practical implementation, each regional energy aggregation unit includes a source-side aggregation terminal, a load-side power supply terminal, and a regional communication terminal. The source-side aggregation terminal connects to the output of the corresponding energy supply unit, the load-side power supply terminal connects to the charging load within the region, and the regional communication terminal establishes an electrical connection with the aggregation conversion unit. It should be noted that these three interfaces correspond to independent conductive paths. The regional communication terminal does not assume normal power supply function within its region; it only establishes a cross-regional energy exchange path when a joint regional power supply is established. Therefore, in a region-independent power supply state, the power supply paths of each region remain electrically isolated from each other.

[0037] Furthermore, multiple regional connection terminals are connected to a junction conversion unit. The junction conversion unit is equipped with a compensation access interface, which connects to energy storage units via an energy storage access branch. The energy storage access branch includes an energy storage isolation component, an energy storage converter (PCS), and energy storage units. The energy storage isolation component is used to control whether the energy storage units participate in the joint power supply path. It should be noted that... Figure 2 The energy storage access branch is not directly connected to any regional energy aggregation unit, but is connected to the compensation access interface corresponding to the aggregation conversion unit. This connection relationship constitutes an important electrical topology that distinguishes this disclosure from the traditional common bus structure. The existing technology has already disclosed the power conversion equipment, protection equipment and basic electrical connection methods in the charging station, and will not be repeated here.

[0038] The following detailed description of the specific structure and operation process of the regional energy aggregation unit, aggregation conversion unit, and energy storage compensation path, in conjunction with specific implementation methods, provides a detailed explanation.

[0039] Those skilled in the art will understand that in a multi-energy power supply system, the power supply unit and the charging load unit typically need to complete the collection, distribution, and exchange of electrical energy through a power distribution structure. In the prior art, multiple power supply devices are usually directly connected to a common power distribution bus, and the common bus provides power supply interfaces to multiple load devices. This method can achieve multi-energy access, but the output changes between different power supply devices will collectively affect the same energy exchange node. In this embodiment, to avoid multiple power supply units being directly coupled to the same common power supply node, this disclosure sets up regional energy aggregation units corresponding to each power supply unit, so that each power supply unit first enters the corresponding regional energy aggregation unit, and then the regional energy aggregation unit completes the power supply organization within the corresponding region.

[0040] Specifically, the regional energy aggregation unit is located between the corresponding energy supply unit and the charging load unit. As an energy exchange node within a single region, it includes a source-side aggregation terminal, a load-side power supply terminal, and a regional communication terminal. The source-side aggregation terminal is used to receive the electrical energy output from the corresponding energy supply unit, the load-side power supply terminal is used to provide electrical energy output to the corresponding charging load unit, and the regional communication terminal is used to establish energy exchange connections between regions with other regional energy aggregation units.

[0041] It should be noted that the source-side junction, load-side power supply, and regional communication terminal in this disclosure are not simply multiple connection interfaces located on the same conductive node, but rather are electrically connected through independent conductive paths. That is, the electrical energy input to the power supply unit first enters the corresponding regional power supply path through the source-side junction, the charging load unit obtains the corresponding regional output through the load-side power supply terminal, and the energy exchange between regions is completed independently through the regional communication terminal.

[0042] By setting up independent conductive paths as described above, distinct source-side input paths, load power supply paths, and regional connection paths are formed within the regional energy aggregation unit. In this way, when no joint power supply relationship is established between regions, the energy input and load power supply within each region can remain relatively independent, preventing changes in the power supply of one region from directly affecting other regions.

[0043] In practical implementation, a regional power supply control component is installed between the source-side junction and the load-side power supply. The regional power supply control component can be a switching device, contactor, circuit breaker, or other electrical component capable of power supply path control with electrical on / off control function. It is installed in the corresponding regional power supply path to control the power transmission status from the corresponding power supply unit to the regional load side.

[0044] It should be noted that the area power supply control component operates on the power supply path within the area, not the energy exchange path between areas. That is, the area power supply control component is used to control the power supply relationship between the corresponding power supply unit and the corresponding charging load unit, while whether energy exchange occurs between areas is controlled by the junction conversion unit set on the area connection path.

[0045] As an optional implementation, when the output of the power supply unit corresponding to the energy aggregation unit in a certain area can meet the power supply requirements of the charging load unit in that area, the area power supply control component keeps the power supply path between the corresponding source-side aggregation terminal and the load-side power supply terminal connected, so that the area forms an independent power supply area; when multiple areas need to coordinate power supply, an inter-area connection is established with the aggregation conversion unit through the area communication terminal.

[0046] Furthermore, adjacent area energy aggregation units are connected to aggregation conversion units via area communication terminals. These conversion units are located on the area communication paths between two or more area energy aggregation units and are used to control whether a continuous electrical connection is formed between the areas.

[0047] It should be noted that the multiple regional energy aggregation units in this disclosure do not have a continuously connected common power supply bus. That is, unlike the connection method in the prior art where multiple energy devices are connected in parallel to the same bus for a long time, this disclosure maintains an independent power supply structure at the regional level, and only establishes a temporary joint power supply path through the aggregation and conversion unit when cross-regional power supply is required.

[0048] During implementation, when the energy aggregation and conversion unit is in the disconnected state, there is no conductive relationship between the interconnection terminals of each region, and each region's energy aggregation unit maintains an independent power supply state. At this time, the first energy supply unit supplies power to the corresponding charging load unit through the first region's energy aggregation unit, and the second energy supply unit supplies power to the corresponding charging load unit through the second region's energy aggregation unit. There is no direct energy exchange path between the regions.

[0049] When the energy aggregation and conversion unit is in the conducting state, adjacent regional energy aggregation units form a cross-regional power supply path through the regional connection terminal, connecting multiple originally independent regional power supply paths into a joint power supply path. In this state, energy supply units corresponding to different regions can jointly participate in load power supply through the joint power supply path, and subsequent energy storage units can also be connected to this joint power supply path through the common compensation branch. It should be noted that the joint power supply path formed by the aggregation and conversion unit does not change the regional attributes of the energy source corresponding to each regional energy aggregation unit, but rather increases the energy exchange capacity between regions while maintaining the regional energy access relationship. That is, this disclosure replaces the traditional "all energy sources continuously connected in parallel" method with the method of "regional independent organization + joint interconnection when necessary", thus separating the energy access relationship from the energy coordination relationship.

[0050] In some more specific application scenarios, when a charging station includes multiple new energy supply areas, multiple regional energy aggregation units can be set up according to the construction scale, and a multi-regional interconnection network can be formed through multiple aggregation and conversion units, so that any adjacent areas can establish power supply connections according to operational needs without changing the existing regional power supply structure. The specific electrical protection devices, voltage conversion equipment and conventional power distribution structures used inside the regional energy aggregation units have been disclosed in the existing technology and will not be elaborated here.

[0051] As an example, see Figure 3 As shown, when each energy supply area can meet the power supply needs of its corresponding load, the regional power supply management unit keeps the aggregation conversion unit disconnected to prevent the formation of a joint power supply path between adjacent areas. At this time, each regional energy aggregation unit establishes an independent power supply path. The photovoltaic energy supply area, wind power supply area, and external distribution network energy supply area supply power to their respective charging loads. There is no continuously connected energy exchange path between the areas. In practice, the regional power supply management unit continuously acquires the corresponding energy supply parameter information and load access status information for each area. When the output capacity of each area meets the load demand of its corresponding area and there is no need for cross-regional power allocation, the aggregation conversion unit corresponding to the regional connection end is kept disconnected. Simultaneously, the energy storage isolation component in the energy storage access branch is kept disconnected, causing the energy storage unit to exit the regional power supply path.

[0052] It should be noted that the energy storage unit leaving the regional power supply path does not mean that the energy storage system stops operating. Rather, the energy storage converter remains in standby mode, and the battery management system continuously collects operating parameters of the energy storage unit, including information such as state of charge, battery cluster voltage, battery cluster temperature, and allowable charge and discharge capacity, to provide an operational basis for entering the joint power supply compensation state. The above-mentioned energy storage monitoring process is existing technology and will not be elaborated here.

[0053] That is, in Figure 3 Under the operating conditions shown, each energy supply area first uses its own energy supply capacity to complete the regional power supply. The energy storage unit does not participate in the real-time power balance formed by the output fluctuations of each new energy source, thereby avoiding the operation mode of continuous low-power compensation of energy storage under the traditional common bus structure.

[0054] Based on the aforementioned implementation methods, the energy exchange process between regions and the energy storage compensation path are further explained.

[0055] In practice, adjacent energy aggregation units are connected to aggregation conversion units via regional communication terminals to achieve controllable connections between power supply paths in different areas. It should be noted that the aggregation conversion unit is not located in the conventional power supply path between the energy supply unit and the charging load unit, but rather on the regional communication path between the regional energy aggregation units, and its control object is the power exchange relationship between regions.

[0056] Specifically, the junction conversion unit includes a first area communication interface and a second area communication interface, which are respectively connected to two adjacent area energy junction units, and an area communication conduction component disposed between the first area communication interface and the second area communication interface. The first area communication interface is used to connect an area communication path in a first direction, the second area communication interface is used to connect an area communication path in a second direction, and the area communication conduction component disposed between the two area communication interfaces is used to control whether a continuous electrical connection path is formed between the two area communication interfaces.

[0057] It should be noted that the regional interconnection and conduction components function differently from the aforementioned regional power supply control components. The regional power supply control components are used to control the power supply relationship between the power supply unit and the charging load unit within a single region, while the regional interconnection and conduction components are used to control whether an energy exchange relationship is established between energy aggregation units in different regions. That is, one acts on the power supply path within a region, and the other acts on the interconnection path between regions; together, they constitute a multi-regional power supply structure.

[0058] As an optional implementation, the regional communication connection component can be implemented using switching equipment, contactors, circuit breakers, or other power electronic switching components with electrical on / off control capabilities. When the regional power supply management unit outputs a regional joint power supply control command, the regional communication connection component performs a closing action, forming an electrical connection path between the first regional communication interface and the second regional communication interface; when inter-regional coordination is not required, the regional communication connection component disconnects, allowing the corresponding region to maintain an independent power supply state.

[0059] Furthermore, the aggregation and conversion unit is also equipped with a compensation access interface, which is located on the electrical connection path between the first regional communication interface and the second regional communication interface. That is, the compensation access interface is not connected to the power supply node inside any regional energy aggregation unit, but is located in the regional joint power supply path formed by the regional communication conduction component.

[0060] It should be noted that the above-mentioned setup limits the energy exchange location of the energy storage unit. When the junction conversion unit is not activated, there is no continuous electrical connection path between the first area connection interface and the second area connection interface, and the compensation access interface does not form an effective joint compensation node. When the junction conversion unit is activated, a joint power supply path is formed between multiple area energy junction units. At this time, the compensation access interface is located inside this joint power supply path and can be used to connect the energy storage unit to participate in energy regulation during the joint power supply process.

[0061] In practical implementation, the energy storage unit is connected to the compensation access interface via an energy storage access branch. The energy storage access branch includes an energy storage side connection terminal, a compensation side connection terminal, and an energy storage isolation component disposed between the two. The energy storage side connection terminal is connected to the energy storage unit, the compensation side connection terminal is connected to the compensation access interface of the aggregation conversion unit, and the energy storage isolation component is used to control the connection status between the energy storage unit and the regional joint power supply path.

[0062] It should be noted that the energy storage access branch differs from the existing method of parallel access of energy storage to a common bus. This energy storage access branch does not connect to the source-side junction of any regional energy aggregation unit, nor to the load-side power supply of any regional energy aggregation unit. Instead, it only connects to the compensation access interface on the regional interconnection path. That is, the energy storage unit does not directly participate in the power exchange between the energy supply unit and the charging load unit within a certain region. Instead, it compensates for the joint power supply path when multiple regions form a joint power supply relationship.

[0063] Furthermore, in implementation, the regional power supply management unit is used to coordinate the operational status between various regional energy aggregation units and aggregation conversion units. Specifically, each regional energy aggregation unit is equipped with an energy supply status acquisition component to collect energy supply parameter information for the corresponding region.

[0064] The power supply parameter information may include electrical parameters that reflect the regional power supply status, such as the output power, voltage status, current status, and power supply capacity of the corresponding power supply unit. The specific structure and acquisition method of the power parameter acquisition component are already publicly available in the prior art and will not be described further here.

[0065] In practice, the energy supply status acquisition component sends the acquired energy supply parameter information for each region to the regional power supply management unit. The regional power supply management unit then establishes regional power supply status information based on the corresponding energy supply parameter information for each region. This regional power supply status information is used to characterize the current energy supply status of each region's energy aggregation unit and whether a joint power supply relationship needs to be established between regions.

[0066] It should be noted that the regional power supply management unit does not directly adjust the output power of each power supply unit, but controls the working status of the junction conversion unit according to the regional power supply status information, so that the corresponding regional energy junction unit is in the regional independent power supply state or the regional joint power supply state.

[0067] For example, when multiple areas have independent power supply capabilities, the area power supply management unit controls the corresponding junction conversion unit to remain disconnected, and each area energy junction unit supplies power to the corresponding charging load unit; when there is a joint power supply demand between at least two areas, the area power supply management unit controls the corresponding junction conversion unit to be turned on, so that a joint power supply path is established between adjacent area energy junction units, and the energy storage unit has the condition to access the joint power supply path through the common compensation branch.

[0068] In other words, the system implements a control link of "energy status acquisition - regional power supply status establishment - junction conversion control - joint power supply formation" to achieve dynamic switching of regional power supply structure, rather than achieving multi-energy coordination by continuously maintaining the connection relationship of the common bus. In some more specific application scenarios, when the charging station contains multiple new energy supply areas, the connection relationship between different areas can be controlled according to the energy supply status information of each area, so that some areas can maintain independent operation, while areas that need to be coordinated to power supply form a joint power supply path, thereby realizing the flexible configuration of multi-region power supply structure.

[0069] The data processing methods, communication protocols, and basic control programs within the regional power supply management unit fall within the scope of existing power control technologies, which are already publicly available and will not be elaborated upon here.

[0070] The control method for energy storage units participating in the joint power supply process and the formation process of regional power supply status are further explained. In implementation, after multiple regional energy aggregation units establish a joint power supply path through corresponding aggregation and conversion units, the regional power supply management unit further obtains the joint power supply parameter information corresponding to this joint power supply status to determine the current operating status of the joint power supply path. The joint power supply parameter information is not the power supply parameter of a single regional energy aggregation unit, but rather reflects the overall operating status when multiple regional energy aggregation units jointly participate in power supply. As an example, the joint power supply parameter information may include information on the number of regions participating in the joint power supply, the total output capacity information in the joint power supply path, the joint power supply load demand information, and the power exchange status information corresponding to the joint power supply path.

[0071] In practice, the regional power supply management unit controls the operating status of the energy storage access branch based on the acquired joint power supply parameter information. When the joint power supply parameter information meets the operating conditions for energy storage to participate in compensation, the regional power supply management unit controls the energy storage isolation component in the energy storage access branch to operate, establishing an electrical connection between the energy storage side connection terminal and the compensation side connection terminal. The energy storage unit then connects to the joint power supply path corresponding to the junction conversion unit via the common compensation branch. The energy storage access branch enters the compensation connection state, which does not mean that the energy storage unit continuously outputs energy to all regional power supply paths, but rather that the energy storage unit obtains the connection conditions for energy exchange with the joint power supply path. Whether the energy storage unit performs a charging or discharging process can be further determined based on the actual power status in the joint power supply path.

[0072] In other words, the access process of the energy storage unit in this disclosure has clear hierarchical restrictions: under the state of independent regional power supply, the energy storage access branch remains disconnected, and there is no direct energy exchange path between the energy storage unit and the energy aggregation unit of each region; under the state of joint regional power supply, the energy storage unit is only connected to the joint power supply path formed by regional connection through the common compensation branch.

[0073] Furthermore, through the aforementioned energy storage access method, the working object of the energy storage unit changes from local power supply changes within a single area to overall power changes during the joint operation of multiple areas. It should be noted that this operating mode differs from the traditional structure of energy storage directly connected to a common bus. The energy storage unit does not need to compensate for all transient differences between the various energy supply units in real time, but rather participates in the energy regulation at the corresponding level after a joint power supply relationship is formed.

[0074] In implementation, the regional power supply management unit establishes regional power supply status information based on the power supply parameter information corresponding to each regional energy aggregation unit. Specifically, the regional power supply management unit first obtains the energy type information, output power information, and power supply status information of the corresponding regional energy aggregation unit for each power supply unit.

[0075] The energy type information is used to distinguish the attributes of different energy sources. For example, energy type information can include photovoltaic power generation, wind power generation, and external power grid supply type. Output power information is used to characterize the current power output capacity that the corresponding energy supply unit can provide, and energy supply status information is used to characterize whether the corresponding regional energy aggregation unit is currently in power supply status and the status of the corresponding power supply path. It should be noted that the energy type information is not used to change the output characteristics of different energy devices themselves, but rather to establish the correspondence between energy sources and regional energy aggregation units during the regional power supply management process, enabling the management unit to distinguish the energy sources of different regions.

[0076] In practice, the regional power supply management unit matches the regional identifiers of each energy supply unit based on the energy type information, and associates the output information of the energy supply units with corresponding energy source relationships with the corresponding regional energy aggregation unit to form a regional energy supply information set.

[0077] For example, when an energy aggregation unit in a certain area corresponds to a photovoltaic power generation unit, the regional power supply management unit establishes an association between the output power information and operating status information of the photovoltaic power generation unit and the energy aggregation unit in that area; when another energy supply area corresponds to a wind power generation unit, another independent set of regional energy supply information is formed.

[0078] Furthermore, the regional power supply management unit combines the regional energy supply information set with the load access status information corresponding to each regional energy aggregation unit to generate regional power supply status information.

[0079] The load access status information reflects the number of charging loads connected to the current regional energy aggregation unit, the load demand status, or the load occupancy status. Regional power supply status information includes at least the regional identifier, energy source identifier, regional output capacity information, and regional load occupancy information.

[0080] It should be noted that the regional power supply status information is not a simple data set, but rather operational status information describing the relationship between the current power supply capacity of each regional energy aggregation unit and the load demand. Based on this status information, the regional power supply management unit determines whether the corresponding region should maintain an independent power supply path, or whether a joint power supply path needs to be established through the aggregation and conversion unit.

[0081] In practice, when the output capacity of each regional energy aggregation unit matches the load demand, the regional power supply management unit controls the corresponding aggregation conversion unit to remain disconnected, so that each region maintains an independent power supply path; when the energy supply capacity of some regions is insufficient or there is a collaborative power supply demand between multiple regions, the regional power supply management unit controls the corresponding aggregation conversion unit to be turned on, so that multiple regional energy aggregation units form a joint power supply path.

[0082] It should be noted that the regional power supply management unit does not adjust the power supply by changing the internal power supply topology of the regional energy aggregation unit, but rather changes the overall power supply organization by controlling the interconnection between regions. That is, the power supply path within a region remains relatively stable, and changes in the power supply structure are mainly achieved through the aggregation and conversion unit. In some more specific application scenarios, when a charging station is simultaneously configured with multiple photovoltaic power supply areas, wind power supply areas, and external distribution network power supply areas, the regional power supply management unit can select some areas to maintain independent operation based on the current power supply capacity and load access status of each area, and form a joint power supply path for areas that need coordinated power supply, thereby adapting to changes in different energy output states.

[0083] The specific communication methods, data transmission protocols, and basic control programs used within the regional power supply management unit fall within the scope of existing power system control technologies, which are already publicly available and will not be elaborated upon here. Further explanation will be given regarding the specific process of energy storage units connecting to the joint power supply path and the regional anomaly handling process under joint power supply conditions.

[0084] In practical implementation, when multiple regional energy aggregation units form a joint power supply state through corresponding aggregation conversion units, the regional power supply management unit first determines the current actual participating regional range based on the regional power supply status information corresponding to each regional energy aggregation unit. The set of joint power supply regions is not a pre-set list of regions, but a dynamically determined set of electrical connections based on the current conduction status of the aggregation conversion units and the regional power supply status. That is, only regional energy aggregation units that establish actual electrical connections through aggregation conversion units and jointly participate in the same joint power supply path are identified as the same set of joint power supply regions. In a specific application scenario, a multi-energy complementary charging station includes a photovoltaic power supply region, a wind power supply region, and an external distribution network power supply region. When the regional interconnection branch between the photovoltaic power supply region and the wind power supply region is connected, while the external distribution network power supply region remains independently operating, the regional power supply management unit only identifies the regional energy aggregation units corresponding to the photovoltaic power supply region and the regional energy aggregation units corresponding to the wind power supply region as the set of joint power supply regions.

[0085] Furthermore, after determining the set of joint power supply areas, the regional power supply management unit obtains the joint power supply status information corresponding to that set. This joint power supply status information reflects the current electrical operating status of the joint power supply path, and may include the number of areas participating in the joint power supply, the output power of each area, the power exchange status in the joint power supply path, the regional load demand status, and the operating status of connecting branches, etc.

[0086] It should be noted that the regional power supply management unit does not directly determine the energy storage access location based on the energy supply status of a single region, but rather determines the common compensation access location based on the already established joint power supply topology. This common compensation access location is located on the joint power supply path formed by the junction conversion unit, enabling the energy storage unit to connect to the energy exchange path between multiple regions.

[0087] In practice, when the combined power supply path corresponding to the combined power supply area meets the energy storage compensation conditions, the regional power supply management unit controls the energy storage access branch corresponding to the common compensation access location to be connected. The energy storage isolation component in the energy storage access branch operates, enabling the energy storage unit to access the combined power supply path formed by the energy storage side connection terminal, the compensation side connection terminal, and the common compensation branch connection to the junction conversion unit.

[0088] It should be noted that after the energy storage unit is connected to the joint power supply path, its compensation target is the joint power supply network formed by multiple regions, rather than the local power supply path corresponding to the energy aggregation unit of a certain region. For example, when the photovoltaic region and the wind power region form a joint power supply state, the energy storage unit participates in the power regulation of the joint region through the compensation access interface located on the connection path between the two regions, and will not directly connect to the source-side aggregation terminal corresponding to the photovoltaic region or the load-side power supply terminal corresponding to the wind power region.

[0089] Furthermore, when the set of joint power supply areas changes, the energy storage access path is adjusted synchronously. In specific implementation, when a joint power supply area exits the joint power supply state, the area power supply management unit first controls the corresponding junction conversion unit to disconnect, causing the corresponding area energy junction unit to exit the joint power supply path; then it controls the corresponding energy storage access branch to disconnect, causing the energy storage unit to exit the joint power supply path.

[0090] In other words, the access status of the energy storage unit corresponds to the regional joint power supply topology. When there is no joint power supply relationship between regions, the energy storage unit does not maintain the connection status with the power supply path of that region.

[0091] In the process of handling abnormal areas under the combined power supply status, the regional power supply management unit continuously obtains the power supply status information of each regional energy aggregation unit in the combined power supply regional set during the specific implementation.

[0092] The energy supply status information may include electrical parameters such as regional input voltage status, output power status, energy supply equipment operation status, regional load power supply status, and regional interconnection branch operation status.

[0093] It should be noted that the judgment of abnormal areas in implementation is not based on a single parameter change, but on the actual operating status of the energy supply path corresponding to the regional energy aggregation unit. For example, when the corresponding new energy converter in a certain area stops outputting, the electrical parameters on the input side of the area exceed the operating range, or the power supply path of the area experiences an abnormal disconnection, the regional power supply management unit can determine that the area is not suitable to continue participating in the joint power supply.

[0094] After identifying the abnormal area energy aggregation unit, the area power supply management unit controls the corresponding area communication terminal of the abnormal area to disconnect, so that the abnormal area energy aggregation unit exits the current joint power supply path.

[0095] It should be noted that the anomaly isolation process does not disconnect the entire joint power supply network, but only processes the connection path corresponding to the abnormal area. For example, when three regional energy aggregation units form a joint power supply path through two aggregation conversion units, and a power supply anomaly occurs in one of the regions, the regional power supply management unit only controls the regional connection end corresponding to the abnormal region to disconnect, while maintaining the joint power supply relationship between the other two normal regions.

[0096] In practice, after an abnormal area exits, the regional power supply management unit re-establishes a set of joint power supply areas based on the regional power supply status information corresponding to the remaining regional energy aggregation units.

[0097] For example, if the original combined power supply area includes a first photovoltaic area, a second wind power area, and a third distribution network area, when the first photovoltaic area experiences an abnormal power supply outage, the regional power supply management unit reassesses the power supply relationship between the second wind power area and the third distribution network area. If the conditions for combined power supply between the two areas are still met, the corresponding junction conversion unit is kept on, allowing the remaining areas to continue forming a combined power supply path.

[0098] Furthermore, when the re-established joint power supply area set meets the energy storage access conditions, the area power supply management unit controls the corresponding energy storage access branch to re-enter the compensation connection state, so that the energy storage unit can access the new joint power supply path through the common compensation branch.

[0099] It should be noted that the above anomaly handling process reflects the local reconfiguration capability under a regional power supply structure. Since the energy aggregation units in each region are connected through controllable regional communication paths, an anomaly in a single region will not necessarily lead to the collapse of the entire charging station's power supply structure. Instead, the remaining regions can maintain operation through regional withdrawal, joint regional re-establishment, and adjustment of energy storage compensation paths.

[0100] In some more specific application scenarios, when a charging station is configured with multiple new energy supply areas and multiple charging load areas, the regional power supply management unit can dynamically adjust the set of joint power supply areas according to the power supply status, load demand and communication status of different areas, so that the charging station can still maintain an adjustable power supply organization mode in the event of changes in new energy output, partial equipment shutdown for maintenance or local power supply anomalies.

[0101] The specific electrical protection threshold settings, switchgear protection logic, and communication protocol configuration methods fall within the scope of existing power system control technologies, which are already publicly available and will not be elaborated upon here.

[0102] As an example, see Figure 4 , Figure 4 This illustrates the combined power supply path and common compensation path after the regional energy aggregation units form a combined power supply state. When the regional power supply management unit determines that multiple regions have a combined power supply demand based on the regional power supply status information, it controls the corresponding aggregation conversion unit to be turned on, establishing a continuous conductive path between the corresponding regional connection ends, with multiple regional energy aggregation units jointly forming a combined power supply path. As an example, Figure 4 The first and second power supply areas establish a joint power supply relationship through corresponding junction conversion units and jointly provide power to the charging loads within the joint power supply area.

[0103] In practice, after the regional power supply management unit confirms the formation of the joint power supply area, it further obtains the joint power supply status information and determines the location of the corresponding compensation access interface. When the energy storage unit meets the access conditions, it controls the energy storage isolation component in the energy storage access branch to close, so that the AC side of the energy storage converter can be connected to the joint power supply path through the compensation access interface, and the energy storage unit can compensate for the comprehensive power deviation in the joint power supply path.

[0104] It should be noted that in this embodiment, the energy storage unit is always connected to the unified power supply path, and not directly connected to the source-side junction or load-side power supply of any regional energy aggregation unit. Therefore, the power regulation object corresponding to the energy storage unit is the entire unified power supply path, not the output of a single energy supply unit. When a certain new energy supply area experiences short-term output fluctuations, and other energy supply areas within the unified power supply area can achieve energy complementarity, the energy storage access branch maintains its current operating state, and no separate compensation path is established for a single energy supply area.

[0105] Those skilled in the art will understand that a combined power supply path can be formed by two regions, or by three or more regions, depending on the actual engineering needs. Figure 4 Only a typical implementation is shown, and its purpose is to illustrate that the energy storage unit participates in the joint power supply via a common compensation branch, rather than limiting the number of joint power supply areas. Based on the above implementation methods, in order to further illustrate the application process of this disclosure in actual multi-energy charging station projects, the following supplementary explanation of the operation process of this disclosure is given in combination with typical application scenarios including new energy power generation equipment, energy storage equipment and high-power charging equipment.

[0106] In one specific implementation scenario, the multi-energy complementary energy storage passive charging station is applied in park-level new energy charging and swapping infrastructure. This type of application typically involves the simultaneous configuration of photovoltaic arrays, wind turbine generators, external power distribution network access cabinets, energy storage converter systems, and multiple DC charging terminals. Specifically, the photovoltaic power generation units can be connected to the corresponding AC junction box via photovoltaic inverters, the wind power generation units can be connected to the corresponding AC junction box via wind power converter equipment, and the external power distribution network can be connected to the corresponding energy supply area via grid-connected switchgear.

[0107] During construction, the charging station is divided into multiple power supply zones based on the installation location, capacity level, and power supply range of different energy devices. Each power supply zone is equipped with a corresponding energy aggregation unit, which includes a source-side input interface, a load-side output interface, and a zone communication interface. The source-side input interface is configured according to the rated output capacity of the corresponding energy device, the load-side output interface is configured according to the maximum access capacity of charging terminals within the zone, and the zone communication interface is used to meet the electrical connection requirements for energy exchange between different zones.

[0108] It should be noted that different energy devices in actual engineering have different output characteristics. For example, photovoltaic power generation units are affected by solar irradiance intensity, and their output power typically fluctuates in a short period with changes in cloud cover and sunlight angle; wind power generation units are affected by wind speed changes, and their output power variation period differs from that of photovoltaic power generation; the external power distribution network has relatively stable power supply characteristics but is limited by distribution capacity. Therefore, when different energy sources are directly and continuously connected to the same common power supply node, the output changes of each energy source will collectively affect the common node.

[0109] This disclosure organizes different energy inputs regionally through regional energy aggregation units, forming corresponding power supply units for photovoltaic (PV) areas, wind power areas, and distribution network areas. Under independent regional power supply conditions, each regional energy aggregation unit supplies power to its corresponding charging load according to its own power supply capacity. For example, during the day when PV output is high, the PV area can prioritize meeting the power supply needs of the corresponding charging terminals; at night or when PV output is insufficient, other energy supply areas can participate in power supply through joint power supply methods, depending on their operating status.

[0110] In some more specific application scenarios, when multiple vehicles connect to the charging terminal at the same time, causing the load demand in a certain area to exceed the current output capacity of the corresponding power supply unit, the area power supply management unit obtains the output power, load demand power and area connection status information of that area, and determines whether other areas have the conditions for joint power supply.

[0111] For example, the regional power supply management unit acquires the real-time output power P1 of the first photovoltaic region, the load demand power L1 of the first region, the output power P2 of the second wind power region, and the load demand power L2 of the second region. Based on the relationship between the current energy supply capacity and load demand of each region, it establishes regional power supply status information. When there is a power supply gap in the first photovoltaic region, but the second wind power region has available power supply capacity, the regional power supply management unit controls the corresponding junction conversion unit to be turned on, forming a joint power supply path between the two regional energy junction units. After the joint power supply status is formed, not all energy storage devices are immediately involved in power regulation; instead, the joint power supply region aggregation, regional connection status, and energy storage device operating status are first confirmed. For example, the regional power supply management unit acquires the state of charge (SOC), allowable charging and discharging power, DC side voltage status, and energy storage isolation component status of the energy storage converter system. When the energy storage access conditions are met, it controls the energy storage access branch to be turned on.

[0112] In practical energy storage engineering applications, an energy storage unit typically includes a battery cluster, a power supply converter (PCS), a battery management system (BMS), and energy storage-side protection equipment. The BMS collects information on battery cluster voltage, current, temperature, and state of charge (SOC), while the PCS enables bidirectional energy conversion between the energy storage unit and the AC power supply path. The basic components and operating methods of the aforementioned energy storage equipment are existing technologies and will not be elaborated upon here.

[0113] In this disclosure, the energy storage access branch is located at the location of the combined power supply path corresponding to the junction conversion unit, so that the AC side of the PCS is connected to the combined power supply area, rather than a specific new energy supply area. Therefore, when photovoltaic output changes, wind power output changes, or charging load changes rapidly, the energy storage responds to the overall power deviation in the combined power supply path, rather than directly responding to the instantaneous output changes of each new energy device.

[0114] Furthermore, during the operation of large charging stations, there may be situations where some new energy equipment undergoes maintenance, converter equipment malfunctions, or local power supply areas are out of service. For example, when a photovoltaic inverter malfunctions, causing an abnormal power supply path in the corresponding area, the regional power supply management unit obtains the inverter's operating status, regional output power status, and regional connection terminal status for that area, and controls the disconnection of the regional connection terminal corresponding to the abnormal area. It should be noted that during the abnormal area's exit process, the entire joint power supply network is not directly disconnected. Instead, the set of joint power supply areas is re-determined based on the connection status between the remaining regional energy aggregation units. For example, when three energy supply areas form a joint power supply state, if one area exits, but the remaining two areas still have joint power supply capabilities, the aggregation conversion unit between the remaining two areas remains connected, allowing the charging load to continue to be powered by the remaining areas.

[0115] In some engineering expansion scenarios, when a charging station subsequently adds new energy equipment or new charging terminals, a corresponding regional energy aggregation unit can be added, and the existing regional power supply network can be connected through the new regional communication interface. Since this disclosure uses the regional energy aggregation unit as the energy and load access node, the addition of equipment does not require changing the entire original power supply path, but only requires expanding the corresponding regional interface and regional communication relationship.

[0116] It should be noted that the number of regions, types of energy supply units, and number of charging loads in the implementation can be adjusted according to the actual project scale, and this disclosure does not limit the specific quantitative relationships. The specific model selection of photovoltaic inverters, wind power converters, energy storage PCS, charging modules, and electrical protection devices should be determined based on the actual power level, voltage level, and installation environment.

[0117] In another alternative implementation, the multi-energy complementary energy storage passive charging station described in this disclosure can also be applied to charging scenarios where the proportion of new energy output is high and the capacity of the external power distribution network is limited.

[0118] In these application scenarios, charging stations are typically equipped with large-scale photovoltaic arrays, distributed wind power generation equipment, and energy storage systems, while the external power grid is only connected as a supplementary energy source. Because the output power of new energy equipment is affected by environmental factors, there may be a time mismatch between its actual available output capacity and the charging load demand.

[0119] For example, under favorable midday sunlight conditions, the output power of the energy aggregation unit in the photovoltaic power supply area may exceed the current charging load demand, while the power demand in the charging load area on the other side increases due to concentrated vehicle access. At this time, the regional power supply management unit controls the corresponding aggregation conversion unit to be turned on based on the power supply status information and load access status information of each area, so that the area with surplus power supply capacity and the area with high load demand form a joint power supply area set.

[0120] It should be noted that during this operation, energy exchange between regions is primarily completed through the regional interconnection terminal, rather than preferentially through energy storage units. Only when there is still a power deviation that needs adjustment after the joint power supply path is formed will the energy storage units be connected to the joint power supply path via the common compensation branch.

[0121] Through the above operating mode, when the output capacity of new energy is strong, the energy supply complementarity between different regions can be prioritized to complete the energy allocation between regions, avoiding the frequent participation of energy storage units in the short-cycle fluctuation adjustment of new energy.

[0122] In another alternative implementation, this disclosure can be applied to centralized charging stations with multiple DC fast charging terminals; in this application scenario, the charging load exhibits a clear random access characteristic. For example, within the same time period, multiple new energy vehicles simultaneously connect to charging terminals in different areas, causing a rapid increase in power demand on the load side of a certain area.

[0123] For the above operating conditions, each regional energy aggregation unit is equipped with a load-side power supply terminal for connecting to the corresponding charging load unit. The regional power supply management unit obtains the load access status information for each region, including the number of connected charging terminals, the current charging power demand, the load-side output current, and the regional power supply capacity occupancy status. During actual operation, when the load demand of a certain region exceeds the current output capacity of the energy supply unit in that region, the regional power supply management unit does not directly control the energy storage unit to discharge immediately, but first determines whether other regional energy aggregation units have the conditions for joint power supply.

[0124] For example, the first charging area corresponds to the photovoltaic power supply area, and the second charging area corresponds to the power distribution network power supply area. When the first charging area experiences a power shortage due to the concentrated access of fast-charging vehicles, while the second charging area still has available power supply capacity, the regional power supply management unit controls the connection and conversion unit between the first charging area and the second charging area to be turned on, so that the two areas form a joint power supply path.

[0125] It should be noted that the energy storage unit in this implementation is mainly used for overall power compensation under combined power supply conditions, rather than to handle all changes in charging load. This reduces the frequency of small-scale charging and discharging operations of the energy storage system in response to random changes in charging load.

[0126] In another alternative embodiment, this disclosure is also applicable to extended new energy charging stations that include multiple energy storage units; in actual engineering construction, the energy storage system is usually configured in stages according to the site scale, battery capacity requirements, and construction phase. For example, one energy storage cabinet is configured in the initial construction phase, and multiple energy storage cabinets are added later according to the charging scale.

[0127] To address the aforementioned expansion requirements, each energy storage unit is connected to the common compensation branch via a corresponding energy storage access branch. The regional power supply management unit obtains the corresponding operating status information for each energy storage unit, including the energy storage state of charge (SOC), allowable charging and discharging power, energy storage unit online status, and energy storage protection status.

[0128] In practice, once a joint power supply area is formed, the regional power supply management unit selects an energy storage unit that meets the operating conditions to enter the compensation connection state based on the compensation requirements corresponding to the current joint power supply path.

[0129] For example, when the first energy storage unit is in a high SOC state and has the ability to discharge, the regional power supply management unit controls the corresponding energy storage access branch of the first energy storage unit to be turned on; when the first energy storage unit reaches the operating limit, it can be switched to other energy storage units to participate in the joint power supply path compensation.

[0130] It should be noted that the configuration of multiple energy storage units does not change the basic structure of the energy storage post-connection to the joint power supply path in this disclosure. Multiple energy storage units still participate in energy regulation under the regional joint power supply state through the common compensation path.

[0131] In another alternative implementation, this disclosure can be applied to charging scenarios where the external power distribution network capacity is limited or where it is necessary to reduce peak power consumption.

[0132] In this application scenario, the external power distribution network area, the new energy supply area, and the energy storage compensation area all participate in the operation of the charging station. The regional power supply management unit obtains the output power and load demand information of the energy aggregation units in each area in real time.

[0133] For example, during peak evening charging periods, the output of photovoltaic power supply areas decreases, and multiple charging terminals operate simultaneously, increasing the load on external power distribution network supply areas. At this time, the regional power supply management unit controls the joint power supply areas with available energy storage capacity to form a common compensation path, enabling energy storage units to participate in power compensation under joint power supply conditions. It should be noted that the compensation process of the energy storage units is executed after the establishment of the regional joint power supply relationship, and its compensation path is independent of the source-side input paths of each new energy supply unit. Therefore, even if there are output fluctuations in different new energy areas, the energy storage units do not need to track the output changes of each energy device separately, but only need to respond to the overall power changes in the joint power supply path.

[0134] In another alternative implementation, this disclosure is also applicable to weak power grids or temporary energy supply scenarios.

[0135] For example, in remote areas, temporary construction zones, or mobile charging infrastructure where the external power grid capacity is small or there is no stable power input, an independent energy supply system can be built through photovoltaic power supply areas, wind power supply areas, and energy storage areas. In this application scenario, the energy aggregation units in each area are still configured in a regionalized manner. When the output capacity of new energy sources meets part of the load demand, each area maintains an independent power supply status; when multiple energy areas need to supply power collaboratively, a joint power supply path is established through the aggregation and conversion unit, and the access of energy storage units is controlled according to the joint power supply status.

[0136] It should be noted that the term "passive charging station" in this disclosure does not mean that the charging station has no energy input at all, but rather that the charging load side does not need to rely on a single fixed public energy bus for continuous power supply, but achieves power supply through the autonomous organization between multiple energy supply areas.

[0137] The foregoing has provided a detailed description of a multi-energy complementary energy storage passive charging station provided in this application. Those skilled in the art will recognize that the algorithm steps of the various examples disclosed herein can be implemented using electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure. The above description of the embodiments is merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A multi-energy complementary energy storage passive charging station, comprising at least two energy supply units, at least one energy storage unit, multiple charging load units, and a power distribution unit, characterized in that, The power distribution unit includes multiple regional energy aggregation units respectively set up for each power supply unit. Each power supply unit is connected to the corresponding regional energy aggregation unit, and each charging load unit can selectively connect to any regional energy aggregation unit. A junction conversion unit is provided between adjacent area energy junction units. The junction conversion unit is used to switch multiple area energy junction units between an independent area power supply state and an interconnected joint power supply state. The energy storage unit is connected to the aggregation and conversion unit via a common compensation branch, so that the energy storage unit is disconnected from each regional energy aggregation unit when the regional energy aggregation unit is in regional power supply state, and connected to the connected regional energy aggregation unit via a common compensation branch when multiple regional energy aggregation units are in joint power supply state.

2. The method according to claim 1, characterized in that, The regional energy aggregation unit is located between the corresponding energy supply unit and the charging load unit. It includes a source-side aggregation terminal connected to the energy supply unit, a load-side power supply terminal connected to the charging load unit, and a regional communication terminal for establishing a power exchange connection with adjacent regional energy aggregation units. The source-side aggregation terminal, the load-side power supply terminal, and the regional communication terminal are connected through independent conductive paths, and a regional power supply control component is provided between the source-side aggregation terminal and the load-side power supply terminal of any regional energy aggregation unit.

3. The method according to claim 2, characterized in that, Adjacent regional energy aggregation units are connected to aggregation conversion units via regional communication terminals. No continuously connected common power supply bus is provided between multiple regional energy aggregation units. When the aggregation conversion unit is disconnected, each regional energy aggregation unit forms an independent power supply area. When the aggregation conversion unit is connected, a cross-regional power supply path is formed between adjacent regional energy aggregation units.

4. The method according to claim 3, characterized in that, The aggregation and conversion unit includes a first regional communication interface and a second regional communication interface that connect two adjacent regional energy aggregation units respectively, a regional communication conduction component disposed between the first regional communication interface and the second regional communication interface, and a compensation access interface connected to the regional communication conduction component; the regional communication conduction component is used to form an electrical connection path between the first regional communication interface and the second regional communication interface, and the compensation access interface is located on the electrical connection path between the first regional communication interface and the second regional communication interface.

5. The method according to claim 4, characterized in that, An energy storage access branch is provided between the compensation access interface and the energy storage unit. The energy storage access branch includes an energy storage side connection end, a compensation side connection end, and an energy storage isolation component disposed between the energy storage side connection end and the compensation side connection end. The energy storage side connection end is connected to the energy storage unit, and the compensation side connection end is connected to the compensation access interface. The energy storage access branch is not connected to the source side connection end or the load side power supply end of any regional energy aggregation unit.

6. The method according to claim 1, characterized in that, The charging station also includes a power supply status acquisition component installed in each regional energy aggregation unit and a regional power supply management unit connected to the aggregation conversion unit. The power supply status acquisition component collects the power supply parameter information of the corresponding regional energy aggregation unit. The regional power supply management unit establishes regional power supply status information based on the power supply parameter information of each regional energy aggregation unit, and controls the corresponding aggregation conversion unit to form a regional independent power supply status or a regional joint power supply status according to the regional power supply status information. The regional joint power supply status is formed by at least two regional energy aggregation units establishing a joint power supply path through the corresponding aggregation conversion unit.

7. The method according to claim 6, characterized in that, The regional power supply management unit is also used to acquire joint power supply parameter information corresponding to the regional joint power supply state when multiple regional energy aggregation units are in a regional joint power supply state, and control the energy storage access branch corresponding to the energy storage unit to enter the compensation connection state according to the joint power supply parameter information; when the energy storage access branch enters the compensation connection state, the energy storage unit is connected to the joint power supply path corresponding to the aggregation conversion unit through the common compensation branch, while when the regional energy aggregation unit is in a regional independent power supply state, the energy storage access branch is kept disconnected from the regional energy aggregation unit.

8. The method according to claim 6, characterized in that, The regional power supply management unit establishes source-side power supply status information based on the power supply parameter information corresponding to each regional energy aggregation unit, including: Obtain energy type information, output power information and energy status information of corresponding regional energy aggregation units for each energy supply unit. The energy type information includes at least photovoltaic power generation type, wind power generation type and external power distribution network type. Based on the energy type information, the regional identifiers of each energy supply unit are matched, and the output information of the energy supply unit corresponding to the same energy type is associated with the corresponding regional energy aggregation unit to obtain a set of regional energy supply information. Based on the set of regional energy supply information and the load access status information of each regional energy aggregation unit, regional power supply status information is generated. The regional power supply status information includes at least the regional identifier, energy source identifier, regional output capacity information, and regional load occupancy information. Based on the regional power supply status information, the power supply path corresponding to each regional energy aggregation unit is kept as an independent power supply path, or multiple regional energy aggregation units are switched to a joint power supply path through the corresponding aggregation conversion unit.

9. The method according to claim 7, characterized in that, The regional power supply management unit controls the energy storage unit to enter a compensated connection state, including: Based on the regional power supply status information corresponding to multiple regional energy aggregation units in a joint power supply state, the target regional energy aggregation units participating in the joint power supply are determined, and a joint power supply regional set is obtained. The joint power supply regional set includes at least two regional energy aggregation units that have established an electrical connection relationship through aggregation conversion units. Obtain the joint power supply status information corresponding to the set of joint power supply areas, and determine the corresponding common compensation access location based on the joint power supply status information. The common compensation access location is located on the joint power supply path formed by the junction conversion unit. Control the connection of the energy storage access branch corresponding to the public compensation access location, so that the energy storage unit can be connected to the joint power supply path corresponding to the joint power supply area set via the public compensation branch; When the regional energy aggregation unit switches from a joint power supply state to an independent power supply state, the corresponding energy storage access branch is disconnected, causing the energy storage unit to exit the power supply path corresponding to the regional energy aggregation unit.

10. The method according to claim 9, characterized in that, The regional power supply management unit is also used to isolate the regional connection terminal and load access terminal corresponding to the abnormal region when the power supply path corresponding to any regional energy aggregation unit in the joint power supply regional set is abnormal, including: Obtain the power supply status information corresponding to the energy aggregation unit of each region in the set of joint power supply regions, and determine the energy aggregation unit of abnormal regions; The regional communication terminal corresponding to the abnormal area energy aggregation unit is disconnected, causing the abnormal area energy aggregation unit to exit the joint power supply path, while maintaining the joint power supply relationship formed between other area energy aggregation units through the aggregation conversion unit; Based on the regional power supply status information corresponding to the remaining regional energy aggregation units, a new set of joint power supply areas is established, and the energy storage units are connected to the newly established joint power supply path via the common compensation branch. When the energy aggregation unit in the abnormal area resumes power supply, the restored energy aggregation unit will be reconnected to the joint power supply path via the corresponding area connection terminal.

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