Hybrid energy storage system, cluster and power supply control method

Abstract

The invention discloses a hybrid energy storage system, a cluster and a power supply control method. The hybrid energy storage system comprises a new energy power generation device, a traditional energy power generation device, an energy storage device, a dual-power change-over switch, an energy storage converter and an energy management device. The energy management device is connected with the new energy power generation device, the traditional energy power generation device, the energy storage device, the dual-power change-over switch and the energy storage converter. An input interface of the dual-power change-over switch is connected with the traditional energy power generation equipment and is also used for being connected with a power grid; an output interface of the dual-power change-over switch is connected with a first input interface of the energy storage converter; the new energy power generation equipment is connected with a second input interface of the energy storage converter; the energy storage equipment is connected with a third input interface of the energy storage converter; the output end of the energy storage converter is used for being connected with a load. The power supply requirement can be met under different load conditions, and the influence of power supply fluctuation is reduced.

Description

Technical Field

[0001] This invention relates to the field of power control technology, and in particular to a hybrid energy storage system, cluster, and power supply control method. Background Technology

[0002] In the application of power grid supply, some areas face problems such as high power generation costs and large power supply fluctuations due to geographical reasons such as remote location and complex terrain. Summary of the Invention

[0003] The technical problem to be solved by this invention is: a hybrid energy storage system, cluster and power supply control method to reduce the impact of power supply fluctuations and reduce power generation costs.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A hybrid energy storage system includes a new energy power generation device, a traditional energy power generation device, an energy storage device, a dual-power transfer switch, an energy storage converter, and an energy management device. The energy management device is connected to the new energy power generation device, the traditional energy power generation device, the energy storage device, the dual-power transfer switch, and the energy storage converter. The input interface of the dual-power transfer switch is connected to the traditional energy power generation device and is also used for connection to the power grid. The output interface of the dual-power transfer switch is connected to the first input interface of the energy storage converter. The new energy power generation device is connected to the second input interface of the energy storage converter. The energy storage device is connected to the third input interface of the energy storage converter. The output terminal of the energy storage converter is used for connection to a load.

[0005] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is as follows: A hybrid energy storage cluster includes multiple hybrid energy storage systems as described above, wherein the hybrid energy storage systems are connected in parallel with at least one identical hybrid energy storage system.

[0006] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is as follows: A power supply control method for a hybrid energy storage system, applied to a hybrid energy storage system as described above, or a hybrid energy storage cluster as described above, the method comprising: Determine whether the new energy power generation equipment is in power generation mode; if so, control the new energy power generation equipment to supply power to the load. If it is detected that the power output of the new energy power generation equipment is greater than the power required by the load, then the power output of the new energy power generation equipment to the load is reduced; If the power output of the new energy power generation equipment is detected to be less than the power required by the load, the energy storage equipment is controlled to provide supplementary power. When the energy storage equipment is detected to be in a low power state, the power grid or traditional energy power generation equipment is controlled to provide supplementary power.

[0007] The beneficial effects of this invention are as follows: By constructing a hybrid energy storage system for power supply, and controlling the power supply mode of the hybrid energy storage system through a power supply control method, when the new energy power generation equipment is generating power, priority is given to controlling the power supply of the new energy power generation equipment to the load; by comparing the power generation of the new energy power generation equipment with the power required by the load, when the power generation of the new energy power generation equipment is greater than the power required by the load, the output power of the new energy power generation equipment is reduced to avoid the new energy power generation flowing back to the grid; when the power generation of the new energy power generation equipment is less than the power required by the load, the energy storage equipment is used to supplement the power supply first, and when the energy storage equipment cannot meet the power supply demand, the grid or traditional energy power generation equipment is used to supplement the power supply; based on the judgment of the power required by the load, the power supply demand can be met under different load conditions, reducing the impact of power supply fluctuations; and by supplying power in the order of new energy power generation equipment, energy storage equipment, traditional energy power generation equipment, and grid, the power supply cost can be effectively reduced. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a hybrid energy storage system according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram showing the connection between the energy storage converter and the power generation equipment; Figure 3 for Figure 1 Schematic diagram of the connection between the energy storage converter and the control distribution box; Figure 4 for Figure 1 A schematic diagram showing the connection between the central control distribution box and the energy storage device; Figure 5 This is a schematic diagram of the communication connection of a hybrid energy storage system according to an embodiment of the present invention; Figure 6 This is a flowchart illustrating the steps of a power supply control method for a hybrid energy storage system according to an embodiment of the present invention. Figure 7 This is a flowchart illustrating the steps of a power supply control method for a hybrid energy storage system during normal grid operation, according to an embodiment of the present invention. Figure 8 This is a flowchart illustrating the steps involved in a power supply control method for a hybrid energy storage system during abnormal grid operation, according to an embodiment of the present invention. Label Explanation: PV (Photovoltaic Power Generation Equipment); DGS (Digital Gas Generation Equipment); BAT (Baidu-Action Power Storage Equipment); ATS (Automatic Power Transfer Switch); PCS (Power Storage Converter); EMS (Energy Management System); Grid (Power Grid). Detailed Implementation

[0009] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0010] Glossary:

[0011] In grid-connected power supply applications, some areas, due to geographical factors such as remoteness and complex terrain, face challenges such as high generation costs and significant power supply fluctuations when supplying power to these areas. To address these technical problems, this invention provides a hybrid energy storage system, cluster, and power supply control method that can reduce the impact of power supply fluctuations and lower generation costs.

[0012] Please refer to Figures 1 to 5 A hybrid energy storage system includes a new energy power generation device (PV), a traditional energy power generation device (DGS), an energy storage device (BAT), a dual power transfer switch (ATS), an energy storage converter (PCS), and an energy management device (EMS). The EMS is connected to the PV, DGS, BAT, ATS, and PCS. The ATS has an input interface connected to the DGS and also connected to the power grid. The ATS has an output interface connected to a first input interface of the PCS. The PV has a second input interface connected to the PCS. The BAT has a third input interface connected to the PCS. The PCS's output is connected to a load.

[0013] As can be seen from the above description, the beneficial effects of the present invention are as follows: by constructing a hybrid energy storage system consisting of a new energy power generation device (PV), a traditional energy power generation device (DGS), an energy storage device (BAT), a dual power transfer switch (ATS), an energy storage converter (PCS), and an energy management device (EMS), the system can provide three different power generation methods: new energy power generation, traditional energy power generation, and energy storage device (BAT) power generation. Furthermore, by combining the energy storage converter (PCS) and the energy management device (EMS), the system can control the different power generation devices, thereby enabling power supply under different operating conditions.

[0014] Another embodiment of the present invention provides a hybrid energy storage cluster, including multiple hybrid energy storage systems as described above, wherein the hybrid energy storage systems are connected in parallel with at least one identical hybrid energy storage system.

[0015] As described above, by connecting multiple identical hybrid energy storage systems in parallel, these systems can work together to supply power and meet the power requirements of different loads.

[0016] In one embodiment of this application, all the hybrid energy storage systems share a single energy storage converter PCS; or the energy storage converter PCS in each of the hybrid energy storage systems are connected in series.

[0017] As described above, sharing a single energy storage converter (PCS) across all hybrid energy storage systems can be applied to scenarios where a single hybrid energy storage system can meet the load power requirements, but the off-grid operation time is longer. Connecting the energy storage converters (PCS) in each hybrid energy storage system in series allows the cluster to expand its power through series expansion to meet the demand for large load power.

[0018] Another embodiment of the present invention provides a power supply control method for a hybrid energy storage system, applied to a hybrid energy storage system as described above, or a hybrid energy storage cluster as described above, the method comprising: Determine whether the new energy power generation equipment (PV) is in power generation mode; if so, control the new energy power generation equipment (PV) to supply power to the load. If it is detected that the power generation of the new energy power generation equipment PV is greater than the power required by the load, then the power output of the new energy power generation equipment PV to the load is reduced; If the power generation of the new energy power generation equipment PV is detected to be less than the power required by the load, the energy storage device BAT is controlled to provide supplementary power. When the energy storage device BAT is detected to be in a low power state, the grid or the traditional energy power generation equipment DGS is controlled to provide supplementary power.

[0019] As described above, when power is supplied through a hybrid energy storage system, the power supply mode of the hybrid energy storage system is controlled by a power supply control method. When the renewable energy generation equipment (PV) is generating power, priority is given to controlling the renewable energy generation equipment (PV) to supply power to the load. By comparing the power generation of the renewable energy generation equipment (PV) with the power required by the load, if the power generation of the renewable energy generation equipment (PV) is greater than the power required by the load, the power output of the renewable energy generation equipment (PV) is reduced to prevent renewable energy generation from flowing back to the grid. If the power generation of the renewable energy generation equipment (PV) is less than the power required by the load, the power is first supplemented by the energy storage equipment (BAT). If the energy storage equipment (BAT) cannot meet the power supply demand, the power is then supplemented by the grid or the traditional energy generation equipment (DGS). Based on the judgment of the power required by the load, the power supply demand can be met under different load conditions, reducing the impact of power supply fluctuations. Furthermore, supplying power in the order of renewable energy generation equipment (PV), energy storage equipment (BAT), traditional energy generation equipment (DGS), and grid can effectively reduce power supply costs.

[0020] In one embodiment of the present invention, the step of detecting that the power generation capacity of the new energy power generation equipment PV is greater than the power required by the load further includes: Determine whether the energy storage device BAT has reached a high power state. If not, control the new energy power generation device PV to charge the energy storage device BAT.

[0021] As described above, when the power generation of the new energy power generation equipment (PV) is greater than the power required by the load, and the energy storage device (BAT) has not reached a high power state, the excess power generation of the new energy power generation equipment (PV) can be used to charge the energy storage device (BAT). This can avoid the problem of the power generation of the new energy power generation equipment (PV) flowing back into the grid when the local load cannot absorb it, and at the same time, it can store the excess power.

[0022] In one embodiment of the present invention, determining whether the energy storage device BAT has reached a high power state further includes: If a high power level is reached and the current power supply from the grid is abnormal, the power output of the new energy power generation equipment (PV) to the load is reduced. If the power level reaches a high level and the power grid is supplying power normally, the excess power of the new energy power generation equipment PV is obtained and sold to the power grid.

[0023] As described above, when the energy storage device BAT reaches a high power level, the power supply of the new energy power generation device PV is further controlled in conjunction with the current power supply status of the grid. This reduces the power output of the new energy power generation device PV to the load when the grid power supply is abnormal, and sells the excess power to the grid when the grid power supply is normal.

[0024] In one embodiment of the present invention, the step of detecting that the energy storage device BAT has reached a low power state includes: Determine whether the power supply of the current power grid is normal. If so, control the power grid to provide supplementary power. If not, control the traditional energy power generation equipment (DGS) to provide supplementary power.

[0025] As described above, when it is determined that the current storage device lacks power supply, the system further checks whether the power grid (Grid) is supplying power normally. When the grid is supplying power normally, it provides supplementary power. When the grid is supplying power abnormally, the traditional energy generation equipment (DGS) provides supplementary power.

[0026] In one embodiment of the present invention, the step of controlling the conventional energy power generation equipment DGS to provide supplementary power supply if not included includes: Determine whether the energy storage device BAT has reached the target charge amount. If so, control the energy storage device BAT to provide supplementary power.

[0027] As described above, during the process of supplementing power supply based on traditional energy generation equipment DGS, if the energy storage device BAT regains its power supply capability, the energy storage device BAT will be controlled to supplement power supply, thus avoiding continuous power generation by the traditional energy generation equipment DGS, which would lead to an increase in power supply costs.

[0028] In one embodiment of the present invention, it further includes: Determine whether a start command from the start button switch has been received. If so, control the energy storage device BAT to supply power to the energy management device EMS.

[0029] As described above, by setting a start button switch to control the energy storage device (BAT) to supply power to the energy management device (EMS), the system can achieve a black start for the energy storage system when the mains power is abnormal and the customer's load requires off-grid power. This is possible when the system is not running and the mains power supply is interrupted, but the customer's load requires off-grid power. In one embodiment of the present invention, it further includes: Obtain the required power of the load; Determine whether the required power is a multiple of the rated power of one set of the hybrid energy storage system. If so, control the corresponding number of sets of the hybrid energy storage system to supply power according to the multiple.

[0030] As described above, when the power required by the load is identified as a multiple of the rated power of a hybrid energy storage system, the corresponding number of hybrid energy storage systems are simultaneously controlled to supply power to ensure the normal operation of the load.

[0031] A specific embodiment of the present invention is as follows: Please refer to Figures 1 to 5 A hybrid energy storage system includes a new energy power generation device (PV), a traditional energy power generation device (DGS), an energy storage device (BAT), a dual power transfer switch (ATS), an energy storage converter (PCS), and an energy management device (EMS). In this embodiment, the traditional energy power generation device (DGS) is a diesel generator, depending on the actual application scenario. The energy management device (EMS) is connected to the new energy power generation device (PV), the traditional energy power generation device (DGS), the energy storage device (BAT), the dual power transfer switch (ATS), and the energy storage converter (PCS). The input interface of the dual power transfer switch (ATS) is connected to the traditional energy power generation device (DGS) and is also used for connection to the power grid (Grid). The output interface of the dual power transfer switch (ATS) is connected to the first input interface of the energy storage converter (PCS). The new energy power generation device (PV) is connected to the second input interface of the energy storage converter (PCS). The energy storage device (BAT) is connected to the third input interface of the energy storage converter (PCS). The output terminal of the energy storage converter (PCS) is used for connection to the load.

[0032] like Figure 1 As shown, the ESS in this embodiment consists of an electrical cabinet (one cabinet can hold up to 8 energy storage devices BAT), one energy storage converter PCS, one control distribution box, one main control box, one air conditioner, one dual power transfer switch ATS, and one fire protection system. The energy management device EMS is connected to the traditional energy generation equipment DGS, energy storage devices BAT, and air conditioner via RS485. Typically, 8 electrical cabinets (109kWh) are connected to one 50kW-PCS hybrid inverter to form one device. The application method based on the electrical cabinet can be freely matched with the battery capacity and PCS power requirements according to the user or project scenario to meet the actual use needs. For example, two devices + one hybrid inverter PCS (i.e., DC parallel connection) can be configured to become a 50kW / 200kWh system; or two devices + two hybrid inverter PCS (i.e., AC parallel connection) can be configured to become a 100kW / 200kWh system.

[0033] The main and backup power transfer switch (ATS) has automatic switching and automatic recovery functions. The traditional energy generation equipment (DGS) is normally connected to the backup input interface of the ATS, and the grid is connected to the common input interface of the ATS. The energy storage converter (PCS) defaults to load priority mode. For details on the specific strategy, please refer to the subsequent control method. The new energy generation equipment (PV) is directly connected to the energy storage converter (PCS). The transformation is completed internally by the energy storage converter (PCS), and the output power of the new energy generation equipment (PV) is also controlled by the energy storage converter (PCS) (that is, the function of the energy storage converter (PCS) includes the function of the photovoltaic controller (MPPT)).

[0034] The AC output interface of the energy storage converter PCS is connected to the terminal block to supply power to the customer's load. Simultaneously, a single-phase circuit is drawn to power the air conditioner of the temperature control equipment. This power is then connected in parallel through an AC / DC (220Vac / 24Vdc) module and diode D1 to supply power (Vout) to the 24Vdc load inside the cabinet. Inside the main control box, a parallel power supply is connected to the DC bus (DC+ / DC-) through a miniature circuit breaker QF3, fuse FU3, a DC / DC (1000Vdc / 24Vdc) module, and diode D2 to supply power to the load inside the cabinet. The load is powered by a 24Vdc load (Vout). The AC / DC output side (V1) voltage is adjusted to 25.8~26.3Vdc, and the DC-DC output side (V2) voltage is adjusted to 24.8~25.3Vdc. The forward voltage drop of the diode is Vf1 / 2 (i.e., the forward voltage drop). According to the diode characteristics, when the grid power supply is normal, diode D1 conducts to supply power to the 24V load; when the grid power supply is abnormal, diode D2 conducts to supply power to the 24V load, thus acting as an uninterruptible power supply. The 24Vdc load includes EMU, router, switch, indicator lights, water immersion sensor, smoke detector, temperature sensor, combustible gas detector, leakage current detection board, main control box, and other equipment. The main control box also contains 24Vdc loads, and the power supply is introduced from the control distribution box. It includes main positive / main negative relays, pre-charge relays, DC / DC switching power supply (24V to 12V), Hall sensor (12V), secondary BMS board, and other equipment.

[0035] In this embodiment, the system has an off-grid black-start function: when the system is not running and the grid power supply is abnormal, the device can draw power from the energy storage device BAT, and wake up the energy management device EMS system along the DC / DC and diode D2 circuit, thereby starting the ESS device to operate normally off-grid. Please refer to Table 1 for the state of the diode under different operating conditions.

[0036] Table 1. Diode status under different operating conditions

[0037] like Figure 5The diagram shows the communication architecture of ESS. In the BAT energy storage device, the first-level BMS communicates with the second-level BMS_CAN, and the second-level BMS communicates with the EMS_CAN. The new energy power generation equipment PV, grid, energy storage converter PCS, ACMeter, and combustible gas detector H2 all communicate with the energy management device EMS. The energy management device EMS can send ESS data to the upstream customer EMS or cloud platform. In one embodiment of the present invention, the above-described hybrid energy storage system can be connected in parallel with multiple identical hybrid energy storage systems to form a hybrid energy storage cluster. During connection, all the hybrid energy storage systems can share a single energy storage converter (PCS); or the energy storage converters (PCS) within each hybrid energy storage system can be connected in series.

[0038] Please refer to Figure 6 Another embodiment of the present invention provides a power supply control method for a hybrid energy storage system, applied to a hybrid energy storage system as described above, or a hybrid energy storage cluster as described above, the method comprising: S1. Determine whether the new energy power generation equipment PV is in power generation state. If so, control the new energy power generation equipment PV to supply power to the load. S2. If it is detected that the power generation of the new energy power generation equipment PV is greater than the power required by the load, the power output of the new energy power generation equipment PV to the load is reduced; further, it is also determined whether the energy storage device BAT has reached a high power state. If not, the new energy power generation equipment PV is controlled to charge the energy storage device BAT.

[0039] When controlling the new energy power generation equipment (PV) to charge the energy storage device (BAT), if a high power state is reached and the current power supply of the grid is abnormal, the power output of the new energy power generation equipment (PV) to the load is reduced; if a high power state is reached and the current power supply of the grid is normal, the excess power of the new energy power generation equipment (PV) is obtained and sold to the grid.

[0040] S3. If the power generation of the new energy power generation equipment PV is detected to be less than the power required by the load, the energy storage device BAT is controlled to provide supplementary power. Furthermore, when the energy storage device BAT is detected to be in a low-power state, the grid or traditional energy power generation equipment DGS is controlled to provide supplementary power. Specifically: Determine whether the current power supply of the grid is normal. If so, control the grid to provide supplemental power. If not, control the conventional energy generation equipment (DGS) to provide supplemental power. During charging, determine whether the energy storage device (BAT) has reached the target charge amount. If so, control the energy storage device (BAT) to provide supplemental power.

[0041] When the system is not running, if there is a mains power failure and the power supply cannot be supplied normally, the customer load will require the ESS to be powered off-grid. At this time, the energy management device EMS (powered by the energy storage device BAT) can be woken up by the ESS start button switch to realize the black start of the off-grid ESS system.

[0042] Meanwhile, in the application scenario of hybrid energy storage clusters: Obtain the required power of the load; determine whether the required power is a multiple of the rated power of one set of the hybrid energy storage system; if so, control the corresponding number of sets of the hybrid energy storage system to supply power according to the multiple.

[0043] For example: ① If the customer's load power requirement is: P 负载 =n*P pcs Rated (n is a multiple, P) pcs The rated power is the rated power of a hybrid energy storage system. In other words, if a single ESS cannot meet the load demand, multiple ESSs can be connected in parallel on the AC bus copper bus in the external cable distribution box. The energy storage converter PCS expands the power through string expansion to meet the load power demand. ②If a single set of ESS P pcs The rated load is sufficient to meet the customer's P load requirements, but for longer off-grid operation, multiple ESS DC busbars can be connected in parallel. Since the energy storage converter PCS is wall-mounted outside the cabinet, in addition to the first ESS being equipped with the energy storage converter PCS, the second ESS can be equipped with only equipment other than the energy storage converter PCS. For example, the DC+ / DC- of the second ESS can be connected in parallel with the DC+ / DC- of the first ESS on the DC+ / DC- copper busbar in the external cable distribution box.

[0044] This embodiment provides a specific application scenario to illustrate the above control method: (1) Mains power is normal, grid-connected & photovoltaic access operation mode (highest priority): Please refer to Figure 7 If the mains power supply is normal and photovoltaic power generation is available, photovoltaic power generation should be used first (P). 光伏 / P pv ( ) Supply power to the load. When the energy management device (EMS) detects a negative value in the AC main circuit current and power readings detected by the AC meter, i.e., P pv ≥P 负载 The Energy Management System (EMS) will then send a power command to the photovoltaic controller to determine if the battery has reached the target SOC. If not, it will continue charging the battery until the target SOC is reached. Once the target SOC is reached, it will determine whether a grid connection is enabled. If a grid connection is enabled, excess electricity will be sold. If a grid connection is not enabled, the photovoltaic controller will control the power output P. pv ≤P 负载This ensures that no current generated by photovoltaic power generation flows back into the grid. When the photovoltaic power generation P pv ≤P 负载 At this time, the customer's load is powered by photovoltaic power generation (priority) and the grid (to compensate for the power difference), P 负载 =P pv +P 电网 / and P 电池 .

[0045] (2) In the event of a mains power outage, the following operation mode is activated: off-grid photovoltaic grid connection, energy storage system, and diesel generator connection. Please refer to Figure 8 During system operation, when a mains power failure occurs and power supply cannot be provided normally, due to the function of the dual power transfer switch (ATS) component, the input side of the common circuit switch is opened, and the backup circuit is automatically closed (i.e., connecting the circuit of the traditional energy generation equipment (DGS) and the energy storage converter (PCS). The 24V load power supply is drawn from the high voltage of the energy storage equipment (BAT). At the same time, when the AC main circuit current and power detected by the AC meter show a value of "0", the energy management equipment (EMS) prioritizes checking whether the current PV is in the power generation state. a. If the PV is generating power, priority is given to supplying loads powered by photovoltaic power generation. In this case, if P... pv >P 负载 The energy management system (EMS) sends a power command to the photovoltaic controller to determine if the battery has reached the target SOC. If not, it continues to charge the battery until the target SOC is reached. If the target SOC is reached, it controls the photovoltaic controller to output power P. pv ≤P 负载 This ensures that no current from photovoltaic power generation flows back into the grid. If P pv <P 负载 The energy management device (EMS) issues a power command, causing: P pcs =P 负载 -P pv The energy storage converter PCS draws power from the energy storage device BAT (battery); when the energy storage device BAT has insufficient power, it is further powered by a diesel generator (to make up the power difference).

[0046] b. If the PV is not generating power, the energy storage device BAT will be discharged first to supply power to the load; c. If the PV is not in the power generation state and the energy storage device BAT reaches the discharge limit, the energy management device EMS sends a diesel power generation command to the conventional energy power generation device DGS, and the conventional energy power generation device DGS enters the power generation state to supply power to the load.

[0047] In summary, this invention discloses a hybrid energy storage system, cluster, and power supply control method. The hybrid energy storage system comprises new energy power generation equipment, traditional energy power generation equipment, energy storage equipment, a dual-power transfer switch, an energy storage converter, and energy management equipment. This allows the system to support three different power generation methods: new energy power generation, traditional energy power generation, and energy storage equipment power generation. The energy storage converter and energy management equipment enable control of these different power generation devices, allowing for power supply under various operating conditions. The power supply control method controls the system or cluster, enabling it to simultaneously support multiple modes such as off-grid black start, grid connection, photovoltaic power generation, and diesel power supplementation. Combined with support for multiple ESS AC / DC parallel operation modes, it is sufficient to meet the stable power supply needs of remote areas while simultaneously achieving the goals of reducing carbon emissions and operation and maintenance costs.

[0048] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A hybrid energy storage system, characterized in that, It includes new energy power generation equipment, traditional energy power generation equipment, energy storage equipment, dual power transfer switch, energy storage converter, and energy management equipment; the energy management equipment is connected to the new energy power generation equipment, traditional energy power generation equipment, energy storage equipment, dual power transfer switch, and energy storage converter respectively; The input interface of the dual power transfer switch is connected to the conventional energy power generation equipment and is also used for connection to the power grid; The output interface of the dual power transfer switch is connected to the first input interface of the energy storage converter. The new energy power generation equipment is connected to the second input interface of the energy storage converter; The energy storage device is connected to the third input interface of the energy storage converter; The output of the energy storage converter is used to connect to the load.

2. A hybrid energy storage cluster, characterized in that, The invention includes a hybrid energy storage system as described in claim 1, wherein the hybrid energy storage system is connected in parallel with at least one identical hybrid energy storage system.

3. A hybrid energy storage cluster according to claim 2, characterized in that, All of the aforementioned hybrid energy storage systems share a single energy storage converter; Or the energy storage converters in each of the hybrid energy storage systems can be connected in series.

4. A power supply control method for a hybrid energy storage system, characterized in that, Applied to a hybrid energy storage system as described in claim 1, or a hybrid energy storage cluster as described in any one of claims 2-3, the method comprises: Determine whether the new energy power generation equipment is in power generation mode; if so, control the new energy power generation equipment to supply power to the load. If it is detected that the power output of the new energy power generation equipment is greater than the power required by the load, then the power output of the new energy power generation equipment to the load is reduced; If the power output of the new energy power generation equipment is detected to be less than the power required by the load, the energy storage equipment is controlled to provide supplementary power. When the energy storage equipment is detected to be in a low power state, the power grid or traditional energy power generation equipment is controlled to provide supplementary power.

5. The power supply control method for a hybrid energy storage system according to claim 4, characterized in that, The condition that the power generation capacity of the new energy power generation equipment is detected to be greater than the power required by the load also includes: Determine whether the energy storage device has reached a high power state; if not, control the new energy power generation equipment to charge the energy storage device.

6. The power supply control method for a hybrid energy storage system according to claim 5, characterized in that, The step of determining whether the energy storage device has reached a high power state also includes: If a high power level is reached and the current power grid supply is abnormal, the power output of the new energy power generation equipment to the load is reduced. If the power level reaches a high level and the power grid is supplying power normally, the excess power generated by the new energy power generation equipment is acquired and sold to the power grid.

7. The power supply control method for a hybrid energy storage system according to claim 4, characterized in that, The step of detecting that the energy storage device has reached a low power state includes: Determine whether the current power supply from the power grid is normal. If so, control the power grid to provide supplementary power supply; otherwise, control the traditional energy power generation equipment to provide supplementary power supply.

8. The power supply control method for a hybrid energy storage system according to claim 7, characterized in that, If not, then controlling the conventional energy power generation equipment to provide supplemental power includes: Determine whether the energy storage device has reached the target charge level. If so, control the energy storage device to provide supplementary power.

9. The power supply control method for a hybrid energy storage system according to claim 4, characterized in that, Also includes: Determine whether a start command from the start button switch has been received. If so, control the energy storage device to supply power to the energy management device.

10. The power supply control method for a hybrid energy storage system according to claim 4, characterized in that, Also includes: Obtain the required power of the load; Determine whether the required power is a multiple of the rated power of one set of the hybrid energy storage system. If so, control the corresponding number of sets of the hybrid energy storage system to supply power according to the multiple.

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