Light storage direct current flexible energy power supply system and electric equipment

Abstract

The invention discloses an optical storage direct current flexible energy power supply system and electric equipment, the optical storage direct current flexible energy power supply system comprises a direct current bus, a photovoltaic module carried on the direct current bus, a power grid module, a plurality of battery modules and a direct current load, and the optical storage direct current flexible energy power supply system further comprises an auxiliary power supply system; the auxiliary power supply system is provided with at least one auxiliary load unit and an auxiliary power supply for supplying power to the auxiliary load unit, and the auxiliary power supply is connected to the battery module to take electricity. Compared with the prior art, the auxiliary power supply utilizes the battery module to supply power, so that the auxiliary power supply system can operate in the grid-connected and off-grid states of the power grid module, a UPS battery is not needed, the cost is lower, and the problem that the UPS battery is short in service life and needs to be replaced frequently is solved.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic power generation, and in particular to a photovoltaic storage direct flexible energy power supply system and electrical equipment. Background Art

[0002] In the photovoltaic storage direct flexible energy station system, photovoltaic, energy storage, load, and grid converters are the main power components of the energy station system. They need to complete the main functions of photovoltaic MPPT, energy storage charging and discharging, and power supply for AC / DC loads. Their reliable operation is very important. The auxiliary functions of its energy management system (EMS), energy storage battery module battery management system (BMS), fire control system, liquid cooler, etc., as the scheduling coordination, safety protection and temperature control of the main functional components, the reliability of its auxiliary power supply system is also very important.

[0003] In the field of energy storage station products (which is simpler than the photovoltaic storage direct flexible energy station of this patent and only has the energy storage link), patent CN20231074615.4 invented a method for auxiliary power supply of uninterruptible power supply for energy storage system. In order to ensure that the battery in the uninterruptible power supply (UPS) in the auxiliary power supply system of the energy storage system will not be damaged due to long-term idleness, a photovoltaic system and a solar controller are added to the battery charging end to recharge the UPS battery when there is sunlight.

[0004] Patent CN201710025071.0 A storage system auxiliary power control system uses automatic control to recharge UPS batteries instead of using photovoltaic and other energy sources;

[0005] Patent CN202310256687.4 invented an auxiliary power supply for the energy storage system, which realizes composite power extraction through a power supply control module, that is, when the DC bus in the photovoltaic storage system is powered, it draws power from the DC bus, and when the DC bus is powered off, it draws power from the battery module, thereby ensuring that the auxiliary power supply provides a stable auxiliary source voltage for the battery module and ensures the stable operation of the energy storage system;

[0006] Patent CN202110898573.0 A lithium battery energy storage master control system based on redundant dual auxiliary power supplies uses a dual-input single-output auxiliary power supply circuit;

[0007] Patent CN202011505997.8 is an auxiliary power supply and energy storage system, which realizes composite power supply through the interlocking of three auxiliary power supply circuit controls.

[0008] In the photovoltaic storage direct flexible energy station, there are energy storage batteries that can be used as uninterruptible power supplies. However, the lead-acid batteries used in the above patent have a short lifespan and other batteries used only as UPS have insufficient utilization. At the same time, the composite power extraction method in the above patent has the problems of high control complexity and many fault points.

[0009] Therefore, how to design a photovoltaic storage direct flexible energy power supply system and electrical equipment that can solve the problems of short life of lead-acid batteries used in auxiliary power supply systems in the existing technology, high cost of UPS power supply, and insufficient utilization rate is a technical problem that needs to be urgently solved in the industry. Summary of the invention

[0010] In view of the problems in the prior art that the auxiliary power supply system uses lead-acid batteries with short power supply life, high cost and insufficient utilization of UPS power supply, the present invention proposes a photovoltaic storage direct flexible energy power supply system and power-consuming equipment.

[0011] The technical solution of the present invention is to propose a photovoltaic storage direct flexible energy utilization system, including a DC bus, a photovoltaic module mounted on the DC bus, a power grid module, a plurality of battery modules, and a DC load, and also includes an auxiliary power supply system;

[0012] The auxiliary power supply system has at least one auxiliary load unit and an auxiliary power supply for supplying power to the auxiliary load unit, and the auxiliary power supply is connected to the battery module to obtain power.

[0013] Furthermore, the auxiliary power supply system also includes at least one switching switch and an electric quantity parameter detection unit;

[0014] The switching switch and the electric quantity parameter detection unit are both connected between the auxiliary power supply and the battery module.

[0015] Furthermore, the photovoltaic storage direct flexible energy power supply system also includes a battery management module;

[0016] The battery management module is connected between the battery module and the DC power grid, and is used to detect the charge and discharge amount of the photovoltaic storage direct flexible energy power supply system;

[0017] One end of the power parameter detection unit is connected between the battery module and the battery management module, and the other end of the power parameter detection unit is connected to the auxiliary power supply.

[0018] Furthermore, the charge and discharge capacity of the photovoltaic storage direct flexible energy power supply system satisfies the calculation model:

[0019] i 22 =i 21 -i 23

[0020] Among them, i 22 is the charge and discharge capacity of the photovoltaic storage direct flexible energy power supply system, i 21 is the charge and discharge amount detected by the battery management module, i 23 It is the charge and discharge capacity detected by the electrical capacity parameter detection sheet.

[0021] Furthermore, the photovoltaic storage direct flexible energy power supply system also includes a plurality of energy storage converters;

[0022] The energy storage converter is connected between the battery management module and the DC bus.

[0023] Furthermore, the photovoltaic storage direct flexible energy power supply system has a first working mode and a second working mode;

[0024] In the first working mode, the charging and discharging powers of all the energy storage converters in the photovoltaic storage direct flexible energy power supply system are consistent;

[0025] In the second working mode, the charging and discharging power of all the battery modules in the photovoltaic storage direct flexible energy power supply system is consistent.

[0026] Furthermore, when the photovoltaic storage direct flexible energy power supply system operates in the first working mode and the energy storage converter is in the charging mode, the photovoltaic storage direct flexible energy power supply system increases the charging power of the battery module, and the charging power increased by the battery module is consistent with the charging power of the auxiliary power supply;

[0027] When the photovoltaic storage direct flexible energy power supply system operates in the second operating mode and the energy storage inverter is in the discharge mode, the photovoltaic storage direct flexible energy power supply system reduces the discharge power of the battery module, and the reduced discharge power of the battery module is consistent with the charging power of the auxiliary power supply.

[0028] Furthermore, when the photovoltaic storage direct flexible energy power supply system operates in the second operating mode and the battery module is in the charging mode, the photovoltaic storage direct flexible energy power supply system reduces the charging power of the energy storage inverter, and the charging power reduced by the energy storage inverter is consistent with the charging power of the auxiliary power supply;

[0029] When the photovoltaic storage direct flexible energy power supply system operates in the second operating mode and the battery module is in the discharge mode, the photovoltaic storage direct flexible energy power supply system increases the discharge power of the energy storage inverter, and the discharge power increased by the energy storage inverter is consistent with the charging power of the auxiliary power supply.

[0030] Furthermore, the auxiliary load unit includes at least one of: an MES controller, a fire controller, a water immersion sensor, an environment detection module, a local server, and a liquid cooler.

[0031] The present invention also proposes an electrical device, which has the above-mentioned photovoltaic storage direct flexible energy power supply system.

[0032] Furthermore, the above-mentioned electrical equipment is a photovoltaic air conditioner.

[0033] Compared with the prior art, the present invention has at least the following beneficial effects:

[0034] 1. The present invention adopts a battery module to power the auxiliary power supply system, so that the auxiliary power supply system can operate normally both when the power grid module is connected to the grid and when it is off the grid. At the same time, the battery module is used to power the UPS instead of the UPS, which is more cost-effective and avoids the problem of short UPS battery life requiring frequent replacement.

[0035] 2. The auxiliary power supply system in the present invention only needs to be connected to the battery module to draw power, and no longer needs to be coordinated with other power supply modules to switch in and out, which reduces the control complexity and solves the problem of multiple fault points;

[0036] 3. The present invention is provided with a battery management module and an electric quantity parameter detection unit. When detecting the charge and discharge amount of the photovoltaic storage direct flexible energy power supply system, the charge and discharge amount detected by the battery management module and the electric quantity parameter detection unit can be combined to accurately determine the charge and discharge amount of the photovoltaic storage direct flexible energy power supply system, and accurately feedback the energy efficiency of the photovoltaic storage direct flexible energy power supply system;

[0037] 4. The present invention is provided with two working modes, and in the two working modes, the charging and discharging power of the auxiliary power supply system can be considered, and the charging and discharging power of the energy storage inverter or battery module can be adjusted accordingly, thereby ensuring that the charging and discharging power of each energy storage inverter or battery module remains consistent, thereby optimizing the operation of the photovoltaic storage direct flexible energy power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0039] Figure 1 It is a structural schematic diagram of the auxiliary power supply system in the present invention;

[0040] Figure 2 is a control schematic diagram of the auxiliary power supply system in the present invention;

[0041] Figure 3 This is a control schematic diagram of the charge and discharge control performed by the photovoltaic storage direct flexible energy power supply system in the present invention. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0044] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0045] In the photovoltaic storage direct flexible energy power supply system, the auxiliary power supply system is a very important part. In the current design, the auxiliary power supply system is generally powered by lead-acid batteries or UPS power supplies. However, the use of lead-acid batteries has the problem of short life, and the use of UPS power supplies has the problems of high cost and insufficient utilization.

[0046] In view of the problems existing in the prior art, the present invention proposes a photovoltaic storage direct flexible energy power supply system, which includes a DC bus, a photovoltaic module mounted on the DC bus, a power grid module, a plurality of battery modules, and a DC load;

[0047] It also includes an auxiliary power supply system, which has at least one auxiliary load unit and an auxiliary power source for supplying power to the auxiliary load unit, and the auxiliary power source is connected to the battery module to obtain power.

[0048] Here, the photovoltaic module, the grid module, and the battery module are all power supply modules of the photovoltaic storage direct flexible energy power supply system. When in use, the photovoltaic module, the grid module, and the battery module can be dispatched to supply power or charge according to actual needs to achieve full utilization of energy;

[0049] For example, when the light intensity is strong during the day, the photovoltaic module can be used to power the DC load alone. Due to the strong light intensity, the photovoltaic module will have excess power, which can be used to power the grid module or the battery module.

[0050] When the light intensity is weak during the day, the DC load can be powered by the photovoltaic module in conjunction with the grid module or battery module;

[0051] At night, the grid module and the battery module can be allocated to supply power to the DC load separately or together;

[0052] The photovoltaic storage direct flexible energy power supply system can achieve full utilization of energy by adjusting the charging and discharging status of the above photovoltaic modules, grid modules, and battery modules;

[0053] The auxiliary power supply system generally has auxiliary functions such as EMS controller, fire control system, liquid cooler, etc. As the main functional components of scheduling coordination, safety protection and temperature control, the reliability of the auxiliary power supply system is also very important;

[0054] like Figures 1 to 3 As shown, in a preferred embodiment of the present invention, the auxiliary load unit includes: an MES controller, a fire controller, a water immersion sensor, an environmental detection module, a local server, and a liquid cooler.

[0055] The auxiliary load unit mentioned in the above text is also part of the load such as the above-mentioned EMS controller, fire control system, liquid cooler, etc. At the same time, the auxiliary power supply system also has an auxiliary power supply, which mainly plays a DC / DC conversion function. It is connected to the above-mentioned battery module and can draw power from the battery module. After its DC / DC conversion function, it is converted into a suitable voltage and provided to the auxiliary power supply system. In this application, the preferred working voltage of the auxiliary load unit is 48V, that is, the output voltage of the auxiliary power supply after the DC / DC conversion function is preferably 48V.

[0056] In other embodiments of the present invention, the preferred operating voltage of the auxiliary load unit may also be other voltage levels such as 24V.

[0057] It can be seen from the above structure that the auxiliary power supply system in the present invention is powered by a battery module, which replaces the UPS power supply solution, has lower cost, and avoids the problem of short UPS battery life requiring frequent replacement.

[0058] Furthermore, the auxiliary power supply system in the present invention further includes at least one switching switch and an electric quantity parameter detection unit;

[0059] The switch and the electric quantity parameter detection unit are both connected between the auxiliary power supply and the battery module.

[0060] See also Figure 1 , the above auxiliary power supply system is a deepened part, the auxiliary power supply is a DC / DC module, which can perform DC conversion;

[0061] The above-mentioned power parameter detection unit is Figure 1 The meter in the middle, the switch connected to the meter, Figure 1 It can be seen that the switch and the power detection unit are both connected between the auxiliary power supply and the battery module.

[0062] Here, a switch is added between the battery module and the electric meter to control the power on and off of the auxiliary power supply. This ensures that the photovoltaic storage direct flexible energy power supply system will not consume the power in the battery module when it is not used for a long time at the project site or stored in the inventory for a long time after it is put into use. At the same time, the switch can also be used to quickly obtain power for the auxiliary power supply.

[0063] In the present invention, the switching switch is configured as a circuit breaker, a contactor, and the like.

[0064] Among them, in other embodiments of the present invention, the above-mentioned power detection unit can also be replaced by an auxiliary power supply with a DC metering or detection circuit, without the need for an external electric meter. Compared with the solution using an electric meter, each has its own advantages and disadvantages. The solution using an auxiliary power supply in conjunction with an electric meter can realize the universalization of the auxiliary power supply, without the need for customized development of an input with a DC metering or detection function;

[0065] The use of an auxiliary power supply with a DC metering or detection circuit can realize the reuse of the DC metering or detection circuit, which not only realizes the DC power detection output, but also realizes the application of internal algorithms.

[0066] Furthermore, the photovoltaic storage direct flexible energy power supply system also includes a battery management module;

[0067] The battery management module is connected between the battery module and the DC grid to detect the charge and discharge capacity of the photovoltaic storage direct flexible energy power supply system;

[0068] One end of the electric quantity parameter detection unit is connected between the battery module and the battery management module, and the other end of the two-point detection unit is connected to the auxiliary power supply.

[0069] See also Figure 2 The battery management module in the present invention is actually a BMS module arranged in the high-voltage box. The BMS module can communicate with the power parameter detection unit (that is, the electric meter introduced above) to exchange the charging and discharging data collected by each other.

[0070] Figure 2 The current i 23 The data of charge and discharge collected by the power parameter detection unit, the current i 21 The data of charge and discharge collected by the battery management module. According to Kirchhoff's law, the charge and discharge collected by the battery management module (that is, the charge and discharge of the solar-storage direct-flexible energy power supply system mentioned above) satisfies the calculation model:

[0071] i 22 =i 21 -i 23

[0072] Among them, i 22is the charge and discharge capacity of the photovoltaic storage direct flexible energy power supply system, i 21 is the charge and discharge amount detected by the battery management module, i 23 It is the charge and discharge amount detected by the power parameter test sheet.

[0073] In order to realize the calculation of the above-mentioned calculation model, it is necessary to ensure that the sampling accuracy of the power parameter detection unit and the battery management module are consistent in the present invention, and at the same time, it is necessary to exchange their respective charge and discharge amounts through communication. The communication method between the power parameter detection unit and the battery management module in the present invention is preferably CAN communication.

[0074] In other embodiments of the present invention, the communication method between the above-mentioned power parameter detection unit and the battery management module can also adopt 85 communication, wireless Lora and other communication methods.

[0075] The present invention can improve the accuracy of the SOC estimation of the battery module by the above method. Specifically, when the auxiliary power supply system is not connected, the battery management module in the high-voltage box connected to the battery module calculates the charge and discharge amount of the direct-storage flexible energy power supply system by the Ah integration method, which corresponds to the charge and discharge amount of the battery module, and then the SOC data of the battery module can be estimated;

[0076] After adding the auxiliary power supply system, the battery management module in the high-voltage box connected to the battery module calculates the charge and discharge capacity of the direct-current flexible energy power supply system as the sum of the charge and discharge capacity of the battery module and the charge and discharge capacity of the auxiliary power supply system through the Ah integration method, which satisfies the above calculation model;

[0077] In the above calculation model, i 21 、i 22 Has positive and negative values, representing bidirectional current, i 23 A positive value indicates a unidirectional current. For battery modules with an auxiliary power supply system connected, the charge and discharge amount of the auxiliary power supply system is subtracted when estimating the SOC data of the battery module.

[0078] Furthermore, the photovoltaic storage direct flexible energy power supply system of the present invention also includes a plurality of energy storage converters;

[0079] The energy storage converter is connected between the battery management module and the DC bus.

[0080] See also Figure 2 and Figure 3 , the battery module mentioned above is Figure 2 and Figure 3 From the battery module 1 and the battery module 2, it can be seen that each battery module is connected to a high-voltage box and an energy storage inverter. The battery management module is arranged in the high-voltage box, that is, the energy storage inverter in the previous text is connected between the battery management module and the DC bus.

[0081] Based on the above settings, the photovoltaic storage direct flexible energy power supply system in the present invention has a first working mode and a second working mode;

[0082] In the first working mode, the charging and discharging power of all energy storage converters in the photovoltaic storage direct flexible energy power supply system is consistent;

[0083] In the second working mode, the charging and discharging power of all battery modules in the photovoltaic storage direct flexible energy power supply system is consistent.

[0084] Among them, when the photovoltaic storage direct flexible energy power supply system operates in the first working mode and the energy storage converter is in the charging mode, the photovoltaic storage direct flexible energy power supply system increases the charging power of the battery module, and the charging power increased by the battery module is consistent with the charging power of the auxiliary power supply;

[0085] When the photovoltaic storage direct flexible energy power supply system operates in the second operating mode and the energy storage inverter is in the discharge mode, the photovoltaic storage direct flexible energy power supply system reduces the discharge power of the battery module, and the reduced discharge power of the battery module is consistent with the discharge power of the auxiliary power supply.

[0086] When the photovoltaic storage direct flexible energy power supply system operates in the second working mode and the battery module is in the charging mode, the photovoltaic storage direct flexible energy power supply system reduces the charging power of the energy storage inverter, and the charging power reduced by the energy storage inverter is consistent with the charging power of the auxiliary power supply;

[0087] When the photovoltaic storage direct flexible energy power supply system operates in the second operating mode and the battery module is in the discharge mode, the photovoltaic storage direct flexible energy power supply system increases the discharge power of the energy storage inverter, and the discharge power increased by the energy storage inverter is consistent with the discharge power of the auxiliary power supply.

[0088] The following is combined with Figure 3 The charge and discharge control method in the first working mode and the second working mode is described. The EMS controller first collects the charge and discharge power set by the user, which is set to P use , assuming that the number of energy storage converters configured in the photovoltaic storage direct flexible energy power supply system is N, without considering the power consumption of the energy storage converter itself, there are the following charging and discharging control methods:

[0089] 1. The target requirement is that the charging and discharging power of each energy storage converter is consistent (i.e., the first working mode), that is, at this time, P1=P2=...=P N , the target power actually sent by the EMS controller to each energy storage converter is: P N =P use / N,P2=P 22 +P 23 ;

[0090] According to the above calculation model, the charging and discharging power of the energy storage converter is composed of the battery module and the auxiliary power supply module. Therefore, for the battery module connected to the auxiliary power supply module, its actual charging and discharging power cannot be calculated according to the target power P. N To determine Figure 3 The example of connecting the auxiliary power supply module to the battery module 2 is used to illustrate the target power P. N During charging, since the auxiliary power module is also charged, the actual charging power of the battery module 2 does not reach the target power P N , but will be less than the target power P N Therefore, the charging power of the battery module 2 needs to be increased, and the increased charging power is consistent with the charging power of the auxiliary power supply;

[0091] Similarly, when the target power is P N During discharge, since the auxiliary power module will be charged, it will cause the actual discharge power of the battery module 2 to exceed the target power P N Therefore, it is necessary to reduce the discharge power of the battery module 2, and the reduced discharge power is consistent with the charging power of the auxiliary power supply.

[0092] 2. The target requirement is that the charging and discharging power of each battery module is consistent (i.e., the second working mode), that is, at this time, it is required that P1=P2=...=P N , the target power of each battery module actually sent by the EMS controller is: P N =P use / N,P2=P 22 +P 23 ;

[0093] According to the above calculation model, the charging and discharging power of the energy storage converter is composed of the battery module and the auxiliary power supply module. Therefore, for the energy storage converter connected with the auxiliary power supply module, its actual charging and discharging power cannot be calculated according to the target power P. N To determine Figure 3 The example of connecting the auxiliary power supply module to the battery module 2 is used to illustrate the target power P. N During charging, since the auxiliary power module is also charged, the actual charging power of the energy storage converter will exceed the target power P N Therefore, it is necessary to reduce the charging power of the energy storage converter, and the reduced charging power is consistent with the charging power of the auxiliary power supply;

[0094] Similarly, when the target power is P N During discharge, the auxiliary power module will be charged, which will cause the actual discharge power of the energy storage converter to be less than the target power P NTherefore, it is necessary to increase the discharge power of the energy storage converter, and the increased discharge power is consistent with the charging power of the auxiliary power supply.

[0095] By incorporating the power consumption of the auxiliary power supply system into the SOC estimation as described above, the three-level SOC low warning protection can operate normally, avoiding the over-discharge problem caused by the inability to measure the power consumption of the auxiliary power supply system.

[0096] By adding a DC meter to the front stage of the auxiliary power supply in the auxiliary power supply system, the energy consumption of the auxiliary power supply system can be clearly known, and the system energy efficiency data can be displayed on the human-computer interaction interface. Furthermore, the energy efficiency level of the photovoltaic storage direct flexible energy power supply system is calculated through the EMS controller, that is, the proportion of electricity consumption of the auxiliary power supply system to the main power system, and the operation of the auxiliary power supply system is optimized through the feedback of the system energy efficiency data. For example, with the goal of ensuring that the proportion is sufficiently low, when the photovoltaic storage direct flexible energy power supply system is running at low power or on standby, the EMS controller controls the fire protection, environmental detection module and other components to shut down or standby at low power consumption.

[0097] Overall, the auxiliary power supply system can not only achieve uninterrupted power supply through battery modules, but also use "direct current" to reduce the power supply conversion path. It also does not affect the accuracy of the SOC estimation of the photovoltaic storage direct and flexible energy power supply system. Its protection is enabled normally, making the photovoltaic storage direct and flexible energy power supply system reliable, efficient and stable.

[0098] Furthermore, the present invention also proposes an electrical equipment having the above-mentioned photovoltaic storage direct flexible energy power supply system.

[0099] Furthermore, the above-mentioned electrical equipment is a photovoltaic air conditioner.

[0100] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0101] 1. The present invention adopts a battery module to power the auxiliary power supply system, so that the auxiliary power supply system can operate normally both when the power grid module is connected to the grid and when it is off the grid. At the same time, the battery module is used to power the UPS instead of the UPS, which is more cost-effective and avoids the problem of short UPS battery life requiring frequent replacement.

[0102] 2. The auxiliary power supply system in the present invention only needs to be connected to the battery module to draw power, and no longer needs to be coordinated with other power supply modules to switch in and out, which reduces the control complexity and solves the problem of multiple fault points;

[0103] 3. The present invention is provided with a battery management module and an electric quantity parameter detection unit. When detecting the charge and discharge amount of the photovoltaic storage direct flexible energy power supply system, the charge and discharge amount detected by the battery management module and the electric quantity parameter detection unit can be combined to accurately determine the charge and discharge amount of the photovoltaic storage direct flexible energy power supply system, and accurately feedback the energy efficiency of the photovoltaic storage direct flexible energy power supply system;

[0104] 4. The present invention is provided with two working modes, and in the two working modes, the charging and discharging power of the auxiliary power supply system can be considered, and the charging and discharging power of the energy storage inverter or battery module can be adjusted accordingly, thereby ensuring that the charging and discharging power of each energy storage inverter or battery module remains consistent, thereby optimizing the operation of the photovoltaic storage direct flexible energy power supply system.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A photovoltaic storage direct flexible energy power supply system, comprising a DC bus, a photovoltaic module mounted on the DC bus, a power grid module, a plurality of battery modules, and a DC load, characterized in that: It also includes an auxiliary power supply system; The auxiliary power supply system has at least one auxiliary load unit and an auxiliary power supply for supplying power to the auxiliary load unit, and the auxiliary power supply is connected to the battery module to obtain power.

2. The photovoltaic storage direct flexible energy power supply system according to claim 1 is characterized in that: The auxiliary power supply system also includes at least one switching switch and an electric quantity parameter detection unit; The switching switch and the electric quantity parameter detection unit are both connected between the auxiliary power supply and the battery module.

3. The photovoltaic storage direct flexible energy power supply system according to claim 2 is characterized in that: The photovoltaic storage direct flexible energy power supply system also includes a battery management module; The battery management module is connected between the battery module and the DC power grid, and is used to detect the charge and discharge amount of the photovoltaic storage direct flexible energy power supply system; One end of the power parameter detection unit is connected between the battery module and the battery management module, and the other end of the power parameter detection unit is connected to the auxiliary power supply.

4. The photovoltaic storage direct flexible energy power supply system according to claim 3 is characterized in that: The charge and discharge capacity of the photovoltaic storage direct flexible energy power supply system meets the calculation model: i 22 =i 21 -i 23 Among them, i 22 is the charge and discharge capacity of the photovoltaic storage direct flexible energy power supply system, i 21 is the charge and discharge amount detected by the battery management module, i 23 It is the charge and discharge capacity detected by the electrical quantity parameter detection sheet.

5. The photovoltaic storage direct flexible energy power supply system according to claim 4 is characterized in that: The photovoltaic storage direct flexible energy power supply system also includes a plurality of energy storage converters; The energy storage converter is connected between the battery management module and the DC bus.

6. The photovoltaic storage direct flexible energy power supply system according to claim 5 is characterized in that: The photovoltaic storage direct flexible energy power supply system has a first working mode and a second working mode; In the first working mode, the charging and discharging powers of all the energy storage converters in the photovoltaic storage direct flexible energy power supply system are consistent; In the second working mode, the charging and discharging power of all the battery modules in the photovoltaic storage direct flexible energy power supply system is consistent.

7. The photovoltaic storage direct flexible energy power supply system according to claim 6 is characterized in that: When the photovoltaic storage direct flexible energy power supply system operates in the first working mode and the energy storage converter is in the charging mode, the photovoltaic storage direct flexible energy power supply system increases the charging power of the battery module, and the charging power increased by the battery module is consistent with the charging power of the auxiliary power supply; When the photovoltaic storage direct flexible energy power supply system operates in the second operating mode and the energy storage inverter is in the discharge mode, the photovoltaic storage direct flexible energy power supply system reduces the discharge power of the battery module, and the reduced discharge power of the battery module is consistent with the charging power of the auxiliary power supply.

8. The photovoltaic storage direct flexible energy power supply system according to claim 6 is characterized in that: When the photovoltaic storage direct flexible energy power supply system operates in the second working mode and the battery module is in the charging mode, the photovoltaic storage direct flexible energy power supply system reduces the charging power of the energy storage inverter, and the charging power reduced by the energy storage inverter is consistent with the charging power of the auxiliary power supply; When the photovoltaic storage direct flexible energy power supply system operates in the second operating mode and the battery module is in the discharge mode, the photovoltaic storage direct flexible energy power supply system increases the discharge power of the energy storage inverter, and the discharge power increased by the energy storage inverter is consistent with the charging power of the auxiliary power supply.

9. The photovoltaic storage direct flexible energy power supply system according to claim 1 is characterized in that: The auxiliary load unit includes: at least one of an MES controller, a fire controller, a water immersion sensor, an environment detection module, a local server, and a liquid cooler.

10. An electrical device, characterized in that: The electrical equipment has a photovoltaic storage direct flexible energy power supply system as described in any one of claims 1 to 9.

11. The electrical equipment according to claim 10, characterized in that: The electrical equipment is a photovoltaic air conditioner.

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