Optical storage and charging integrated charging method and system based on dynamic scheduling

Abstract

The invention discloses an optical storage and charging fusion charging method and system based on dynamic scheduling. The system comprises an optical storage hybrid inverter, a photovoltaic power assembly, a double-path PCS and a battery system. An input side DC in the double-path PCS is connected with the battery system, an output side DC is connected to a charging station system, and an AC is connected to a power grid; the PV side of the photovoltaic storage and charging hybrid inverter is connected with a photovoltaic power assembly, the output side DC is connected to the charging station system, and the AC is connected to a power grid. The optical storage and charging hybrid inverter and the dual-path PCS are both in communication connection with an optical storage and charging system, and the dual-path PCS is in communication connection with a battery system; under the condition that mains supply power is not used, charging of a charging station system and battery charging and discharging operation can be supported at the same time, when no vehicle is charged, the storage and charging loop supplies power to the photovoltaic storage and charging loop, the photovoltaic stable grid-connected discharging power operation function is assisted, and the problem of photovoltaic light abandoning of a direct-current coupling framework can be effectively solved.

Description

[0001] This divisional application is based on the mother patent of an invention patent with an application date of June 6, 2024, an application number of 202410726444.7, and a title of "A Photovoltaic-Storage-Charging Integration System and Charging Method". Technical Field

[0002] The present invention relates to the technical field of photovoltaic-storage-charging inspection, and particularly to a photovoltaic-storage-charging integration charging method and system based on dynamic scheduling. Background Art

[0003] Currently, energy storage batteries follow the development route of power batteries. When the capacity of power batteries develops towards an ultra-large capacity, the development direction of energy storage batteries also follows. The current photovoltaic-storage-charging system consists of a DC coupling system. Its advantage is that the batteries in the system can be used as the main source of charging energy support, reducing dependence on the power grid. At the same time, it reduces the impact of orderly charging and disorderly charging on the power grid and reduces the influence on the power grid.

[0004] However, as the battery capacity increases, in order to reduce dependence on the power grid, the demand for photovoltaic power is also greater. The photovoltaic-storage-charging system gives priority to ensuring that the battery does not discharge externally when full, and when there is no vehicle charging, the photovoltaic power is directly coupled into the storage-charging-inspection system, resulting in the phenomenon of abandoned light. To avoid abandoned light and reduce the installed capacity of photovoltaic power, it will affect the battery charging time, and at the same time, problems such as fast consumption of the charging station's power and long charging time will occur. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: to provide a photovoltaic-storage-charging integration charging method and system based on dynamic scheduling, solve the problem of abandoned light in the direct current coupling architecture of photovoltaic power, and ensure the charging efficiency while making full use of photovoltaic power.

[0006] To solve the above technical problem, the technical solution adopted by the present invention is:

[0007] A photovoltaic-storage-charging integration system includes a photovoltaic-storage hybrid inverter, a photovoltaic power component, a dual-path PCS, and a battery system;

[0008] The input side DC of the dual-path PCS is connected to the battery system, the output side DC is connected to the charging station system, and the AC is connected to the power grid;

[0009] The PV side of the photovoltaic-storage-charging hybrid inverter is connected to the photovoltaic power component, the output side DC is connected to the charging station system, and the AC is connected to the power grid;

[0010] Both the photovoltaic-storage-charging hybrid inverter and the dual-path PCS are communicatively connected to the photovoltaic-storage-charging system, and at the same time, the dual-path PCS is communicatively connected to the battery system.

[0011] To solve the above technical problems, another technical solution adopted by the present invention is as follows:

[0012] A charging method for optical storage and charging integration, based on the above-mentioned optical storage and charging integration system, and includes the following steps:

[0013] S1. Determine whether there is a vehicle charging demand in the charging station system. If so, go to step S2; otherwise, go to step S3.

[0014] S2. Judge the battery SOC. If the battery SOC is greater than a preset first threshold, the battery system preferentially provides power for the charging station system; otherwise, the photovoltaic power component and the battery system jointly provide power for the charging station system.

[0015] S3. Judge the battery SOC. If the battery SOC is greater than a preset second threshold, the battery system assists the photovoltaic power component to stably connect to the grid for power generation; otherwise, the photovoltaic power component preferentially discharges, and the battery system does not participate in the regulation.

[0016] A charging method for optical storage and charging integration based on dynamic scheduling, including the steps of:

[0017] S1. Determine whether there is a vehicle charging demand in the charging station system. If so, implement an operation strategy of charging the charging station system and charging and discharging the battery system without using commercial power, and go to step S2.

[0018] S2. Judge the battery SOC. If the battery SOC is greater than a preset first threshold, the battery system is the first priority and the photovoltaic power component is the second priority to provide power for the charging station system, where the photovoltaic power component provides supplementary power for the battery system to establish a stable output charging demand, and then implement a power dynamic balance strategy, with the photovoltaic power component as the first priority to provide power for the charging station system.

[0019] Otherwise, the photovoltaic power component and the battery system jointly provide power for the charging station system preferentially.

[0020] An optical storage and charging integration system, including an optical storage hybrid inverter, a photovoltaic power component, a dual-channel PCS, and a battery system;

[0021] The input-side DC of the dual-channel PCS is connected to the battery system, the output-side DC is connected to the charging station system, and the AC is connected to the power grid;

[0022] The PV side of the optical storage and charging hybrid inverter is connected to the photovoltaic power component, the output-side DC is connected to the charging station system, and the AC is connected to the power grid;

[0023] Both the optical storage and charging hybrid inverter and the dual-channel PCS are communicatively connected to the optical storage and charging system, and at the same time, the dual-channel PCS is communicatively connected to the battery system;

[0024] The photovoltaic-storage-charging integrated system implements the following steps:

[0025] S1. Determine whether there is a vehicle charging demand in the charging station system. If so, implement an operation strategy of charging the charging station system and charging and discharging the battery system without using the city power, and enter step S2;

[0026] S2. Judge the battery SOC. If the battery SOC is greater than a preset first threshold, the battery system has the first priority and the photovoltaic power component has the second priority to provide power for the charging station system. The photovoltaic power component provides supplementary power for the battery system to establish a stable output charging demand, and then implement a power dynamic balance strategy;

[0027] Otherwise, the photovoltaic power component and the battery system are preferentially used to provide power for the charging station system.

[0028] The beneficial effects of the present invention are as follows: A photovoltaic-storage-charging integrated charging method and system based on dynamic scheduling of the present invention has a photovoltaic-storage-charging loop, can independently use photovoltaic power generation, charge the battery and the charging station system through a photovoltaic-storage hybrid inverter. At the same time, the storage-charging loop can also independently use the city power to charge and discharge the battery and the charging station system; it can support the charging of the charging station system and the charging and discharging of the battery without using the city power. When there is no vehicle charging, the storage-charging loop supplies power to the photovoltaic-storage-charging loop to assist the photovoltaic in stabilizing the grid-connected discharge power operation function, which can effectively solve the problem of abandoned light in the photovoltaic with a DC coupling structure; at the same time, it can assist in solving the problem of the impact of the unstable power generation characteristics of the photovoltaic system on the city power, is more friendly to the power grid, and can play a certain supporting role; among them, the dual-channel PCS and the hybrid inverter are connected to the charging loop of the charging station system with independence and are not affected by the battery voltage, and the output voltage can be set higher to improve the charging efficiency of the charging station; when there is a vehicle charging demand in the charging station and the battery system has sufficient power, the city power is not used. First, the battery system has the first priority and the photovoltaic system has the second priority to supply power to the charging station, so as to quickly establish a stable output charging demand, and then enter the power dynamic balance mode, with the photovoltaic as the first priority and the battery system as the second priority to supply power, while ensuring the charging efficiency, making full use of the photovoltaic power. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the architecture of a photovoltaic-storage-charging integrated system according to an embodiment of the present invention;

[0030] Figure 2 It is a flow example diagram of a photovoltaic-storage-charging integrated charging method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0031] To describe the technical content, achieved objectives and effects of the present invention in detail, the following is described in conjunction with embodiments and with reference to the drawings.

[0032] Please refer to Figure 1 , a photovoltaic-storage-charging integrated system, including a photovoltaic-storage hybrid inverter, a photovoltaic power component, a dual-channel PCS, and a battery system;

[0033] The input-side DC of the dual-channel PCS is connected to the battery system, the output-side DC is connected to the charging station system, and the AC is connected to the power grid;

[0034] The PV side of the photovoltaic-storage-charging hybrid inverter is connected to the photovoltaic power component, the output-side DC is connected to the charging station system, and the AC is connected to the power grid;

[0035] Both the photovoltaic-storage-charging hybrid inverter and the dual-channel PCS are communicatively connected to the photovoltaic-storage-charging system, and at the same time, the dual-channel PCS is communicatively connected to the battery system.

[0036] From the above description, it can be seen that the beneficial effects of the present invention are as follows: A photovoltaic-storage-charging integrated system of the present invention has a photovoltaic-storage-charging loop, can independently use photovoltaic power generation, charge the battery and the charging station system through the photovoltaic-storage hybrid inverter, and at the same time, the storage-charging loop can also independently use commercial power to charge and discharge the battery and charge the charging station system; it can support the charging of the charging station system and the charging and discharging operation of the battery at the same time without using commercial power. When there is no vehicle charging, the storage-charging loop supplies power to the photovoltaic-storage-charging loop, assisting the photovoltaic to stably grid-connect and discharge power, which can effectively solve the problem of light abandonment in the photovoltaic with a DC coupling structure; at the same time, it can assist in solving the problem of the impact on commercial power caused by the unstable power generation characteristics of the photovoltaic system, is more friendly to the power grid, and can play a certain supporting role; among them, the charging loops of the dual-channel PCS and the hybrid inverter connected to the charging station system are independent and not affected by the battery voltage, and the output voltage can be set higher to improve the charging efficiency of the charging station.

[0037] Furthermore, both the photovoltaic-storage-charging hybrid inverter and the dual-channel PCS are communicatively connected to the photovoltaic-storage-charging system 485, and the dual-channel PCS is communicatively connected to the battery system via CAN.

[0038] From the above description, the above is a specific embodiment of the communication connection relationship in a photovoltaic-storage-charging integrated system.

[0039] Please refer to Figure 2 , a charging method for photovoltaic-storage-charging integration, based on the above-mentioned photovoltaic-storage-charging integrated system, and includes the following steps:

[0040] S1. Determine whether there is a vehicle charging demand in the charging station system. If yes, go to step S2; otherwise, go to step S3;

[0041] S2. Judge the battery SOC. If the battery SOC is greater than the preset first threshold, the battery system preferentially provides power for the charging station system. Otherwise, the photovoltaic power component and the battery system jointly provide power for the charging station system preferentially;

[0042] S3. Judge the battery SOC. If the battery SOC is greater than the preset second threshold, the battery system assists the photovoltaic power component to stably connect to the grid for power generation. Otherwise, the photovoltaic power component preferentially discharges, and the battery system does not participate in the regulation.

[0043] As can be seen from the above description, the beneficial effects of the present invention are as follows: A charging method for integrating photovoltaics, energy storage, and charging of the present invention can support the charging of the charging station system and the charging and discharging operation of the battery without using commercial power. When there is no vehicle charging, the battery system assists the photovoltaic power component to stably connect to the grid for power generation and assist the photovoltaic to stably connect to the grid and discharge power operation function, which can effectively solve the problem of abandoned light of the photovoltaic with a DC coupling structure; at the same time, it can assist in solving the problem that the unstable power generation characteristics of the photovoltaic system impact the commercial power, is more friendly to the power grid, and can play a certain supporting role.

[0044] Further, the specific method for the battery system to preferentially provide power for the charging station system in step S2 is:

[0045] The battery system is the first priority, and the photovoltaic power component is the second priority to provide power for the charging station system, where the photovoltaic power component provides supplementary power for the battery system, and then a power dynamic balance strategy is implemented.

[0046] As can be seen from the above description, without using commercial power, when the battery SOC of the battery system is relatively abundant, considering that the photovoltaic has characteristics such as power intermittency, interruption, and instability, it can only play a balancing role. At the same time, in order to effectively reduce the battery power output, reflect the photovoltaic energy supplement function, and reduce the battery's constant power output state, the battery system preferentially provides stable power support for the charging station system, and the photovoltaic power component is used as supplementary power to meet the charging demand for quickly establishing a stable output. After the charging is established, the charging power balance is maintained through the power dynamic balance strategy.

[0047] Further, the power dynamic balance strategy is specifically:

[0048] The photovoltaic power component is the first priority, and the battery system is the second priority to provide power for the charging station system, where the battery system provides supplementary power for the photovoltaic power component.

[0049] As can be seen from the above description, when implementing power balance, the photovoltaic power is preferentially used, and the battery power plays a stable regulation role.

[0050] Further, the specific process of the photovoltaic power components and the battery system jointly providing power to the charging station system in step S2 is as follows:

[0051] The photovoltaic power is given the first priority, and the battery system is given the second priority to provide power to the charging station system.

[0052] When the required power of the charging station system is greater than the sum of the powers of the photovoltaic power components and the battery system, if the photovoltaic power meets the preset unstable determination condition, the power provided to the charging station system is reduced or the power supply to the charging station system is stopped.

[0053] As can be seen from the above description, it supports not using the commercial power. When the battery SOC of the battery system is not sufficient, the photovoltaic power is given priority, and the battery power plays a role in stable regulation to provide power to the charging station system. And when the photovoltaic power is unstable, even if the charging power is reduced or the charging is stopped, effective protection is formed.

[0054] Further, the specific process of the battery system assisting the photovoltaic power components in stable grid-connected power generation in step S3 is as follows:

[0055] The photovoltaic power components are given the first priority, and the battery system is given the second priority to provide power to the commercial power, where the battery system provides supplementary power to the photovoltaic power components.

[0056] As can be seen from the above description, when there is no vehicle charging and the battery SOC is relatively sufficient, the storage charging circuit supplies power to the photovoltaic-storage charging circuit to assist the stable grid-connected power generation operation strategy of the photovoltaic power. The photovoltaic power is defined as the priority discharge power and is given the first priority, and the battery power is used as the dynamic adjustment power and is given the second priority.

[0057] Further, in step S3, the photovoltaic power components give priority to discharging, and the battery system does not participate in the regulation. The specific process is as follows:

[0058] The photovoltaic power components give priority to discharging to provide power to the commercial power, and the battery system does not participate in the regulation.

[0059] When the power of the commercial power is less than the first preset ratio of the power of the photovoltaic-storage hybrid inverter, and the power of the photovoltaic power components is greater than the second preset ratio of the power of the photovoltaic-storage hybrid inverter, if the photovoltaic power meets the preset unstable determination condition, the grid-connected power generation power provided to the commercial power is reduced or the grid-connected power generation power supply to the commercial power is stopped.

[0060] As can be seen from the above description, when there is no vehicle charging and the battery SOC is not sufficient, the photovoltaic power is defined as the priority discharge power and is given the first priority. The battery system does not participate in the dynamic regulation. If the photovoltaic power is unstable, the grid-connected discharge power needs to be reduced or the charging is stopped to form protection.

[0061] A photovoltaic-storage-charging integrated system and a charging method of the present invention are applicable to the scenario of new energy vehicle charging.

[0062] Please refer to Figure 1 , the first embodiment of the present invention is:

[0063] A photovoltaic-storage-charging integrated system includes a photovoltaic-storage hybrid inverter, a photovoltaic power component, a dual-channel PCS, and a battery system;

[0064] The input-side DC of the dual-channel PCS is connected to the battery system, and the output-side DC is connected to the charging station system, and the AC is connected to the power grid.

[0065] In this embodiment, for the dual-channel PCS, one input-side DC1 can input a high-voltage wide-range battery system, and the battery system is composed of battery cabinets; one output-side DC2 can output a high-voltage wide-range DC voltage and output it to the charging station system, and the charging station system is composed of DCDC + charging piles; the mains side of the dual-channel PCS is connected to the power grid.

[0066] Figure 1 In, bat represents the battery system.

[0067] The dual-channel PCS provides power for the connected charging system, can be compatible with different voltage levels and obtain the highest efficiency voltage point, improving the compatibility of the charging system and obtaining the best efficiency. When the PCS is off-grid and loses the support of the power grid and needs to supplement energy, it can obtain energy from the output side of the photovoltaic-storage hybrid to avoid battery feed.

[0068] The PV side of the photovoltaic-storage-charging hybrid inverter is connected to the photovoltaic power component, the output-side DC is connected to the charging station system, and the AC is connected to the power grid.

[0069] In this embodiment, the photovoltaic hybrid inverter adopts a high-voltage grid-connected inverter. The PV side of the photovoltaic hybrid inverter has a photovoltaic power component that can be connected to a high-voltage wide range. The photovoltaic power component is composed of mainstream power components; the output DC side of the photovoltaic hybrid inverter can output a high-voltage DC voltage and output it to the charging system, and the charging station system is composed of DCDC + charging piles; the mains side of the photovoltaic hybrid inverter is directly connected to the power grid.

[0070] Both the photovoltaic-storage-charging hybrid inverter and the dual-channel PCS are communicatively connected to the photovoltaic-storage-charging system. Specifically, both the photovoltaic-storage-charging hybrid inverter and the dual-channel PCS are communicatively connected to the photovoltaic-storage-charging system via 485, and the dual-channel PCS is communicatively connected to the battery system via CAN.

[0071] In this embodiment, the hybrid PV energy storage inverter communicates with the EMS of the PV energy storage charging system via 485 communication, and accepts the monitoring and control of the EMS of the PV energy storage charging system. The dual-channel PCS has CAN communication and 485 communication. It communicates with the battery via CAN communication to monitor and control the status information of the battery, and communicates with the EMS system of the PV energy storage charging system via 485 communication to accept the monitoring and control of the EMS.

[0072] In this embodiment, two loops, namely the PV energy storage charging loop and the energy storage charging loop, can be formed based on the above components.

[0073] Among them, the composition of the PV energy storage charging loop: hybrid PV energy storage inverter, PV power module, charging station system, DC input side DC1 and output side DC2 of the dual-channel PCS.

[0074] The connection of the PV energy storage charging loop is as follows: The PV power module is connected to the PV side of the hybrid PV energy storage inverter to provide PV power; the output DC side of the hybrid PV energy storage inverter is connected to the input side of the charging system to provide power to the charging station system, and at the same time is connected to the DC output DC2 of the energy storage charging loop to provide power, which can be used for the battery system to convert and charge; the mains side of the hybrid PV energy storage inverter is connected to the mains power to provide / accept power from the power grid.

[0075] The composition of the energy storage charging loop: dual-channel PCS, charging system, and hybrid PV energy storage inverter.

[0076] The connection of the energy storage charging loop is as follows: The input side DC1 of the dual-channel PCS is connected to the battery to provide and accept power for the battery; the output side DC2 of the dual-channel PCS is connected to the input side of the charging system to directly provide power to the charging station system; the output DC side of the hybrid PV energy storage inverter is connected to the input side of the charging system, and is also connected to the DC output DC2 of the energy storage charging loop to provide power, and at the same time charges the battery and the battery system for conversion.

[0077] The mains side of the dual-channel PCS is connected to the mains power to provide / accept power from the power grid.

[0078] Please refer to Figure 2 , a charging method for the integration of PV energy storage charging, based on the PV energy storage charging integration system described in the above Embodiment 1, and includes the following steps:

[0079] S1. Determine whether there is a vehicle charging demand in the charging station system. If so, go to step S2; otherwise, go to step S3.

[0080] Based on the PV energy storage charging integration system of the above Embodiment 1, the following functions can be realized:

[0081] (1) Implement the operation strategy of the PV energy storage charging loop to independently use PV power generation, and use the hybrid PV energy storage inverter to charge the battery and the charging station system.

[0082] (2) Implement the operation strategy of the storage and charging circuit to independently use the commercial power for charging and discharging the battery and charging the charging station system.

[0083] (3) Implement the operation strategy of charging the charging station system and charging and discharging the battery system without using the commercial power.

[0084] (4) Implement the operation strategy that when there is no vehicle charging, the storage and charging circuit supplies power to the photovoltaic storage and charging circuit to assist the photovoltaic to stably grid-connected discharge power.

[0085] In this embodiment, the functions (3) and (4) are mainly described, and the functions (3) and (4) are distinguished by whether there is a vehicle charging demand.

[0086] S2. Judge the battery SOC. If the battery SOC is greater than the preset first threshold, the battery system preferentially provides power for the charging station system; otherwise, the photovoltaic power component and the battery system jointly provide power for the charging station system.

[0087] In step S2, the battery system preferentially provides power for the charging station system specifically as follows:

[0088] The battery system is the first priority and the photovoltaic power component is the second priority to provide power for the charging station system, where the photovoltaic power component provides supplementary power for the battery system, and then the power dynamic balance strategy is implemented;

[0089] The specific power dynamic balance strategy is as follows:

[0090] The photovoltaic power component is the first priority and the battery system is the second priority to provide power for the charging station system, where the battery system provides supplementary power for the photovoltaic power component.

[0091] In this embodiment, the first threshold is taken as 30%, and in other equivalent embodiments, it can be adjusted according to the actual situation.

[0092] In this embodiment, in the scenario without vehicle charging demand, when the battery SOC is greater than 30%, the battery preferentially provides power for the charging station system. And the following judgments are made:

[0093] (1) Pcharge ≥ Ppv:

[0094] Execute the charging system generation demand strategy:

[0095] Pcharge = Pbat + Ppv.

[0096] That is, the battery system and the photovoltaic power component together provide power for the charging station system.

[0097] Among them, Pcharge represents the charging demand power, Pbat represents the battery system power, and Ppv represents the photovoltaic component power.

[0098] Among them, the charging response is preferentially provided by the battery power, which is defined as the first priority, and the photovoltaic power is defined as the supplementary power, which is defined as the second priority.

[0099] The charging demand is to be quickly established and stably output. At this time, the battery power is required to provide stable power support, and the priority is the battery power output + photovoltaic power output mode. Among them, due to the characteristics of power intermittency, interruption, instability, etc. of the photovoltaic, it can only play a balancing role, and at the same time effectively reduce the battery power output, reflecting the photovoltaic energy supplement function and reducing the battery in a constant power output state. After charging is established, the charging power balance is maintained.

[0100] Execute the power dynamic balance strategy: Define the photovoltaic power as the priority charging power, which is defined as the first priority, and define the battery power as the supplementary charging power, which is defined as the second priority. The photovoltaic power is the main energy supplement source for the photovoltaic energy storage charging system. When executing power balance, the photovoltaic power is preferentially used;

[0101] P_charge = P_bat↓ + P_pv↑ & P_charge = P_bat↑ + P_pv↓.

[0102] The explanation of the above relational expression is: The photovoltaic power P_pv in the relational expression is a variable due to the influence of unstable power generation. When the P_pv power rises, to maintain power balance, the P_bat power decreases accordingly. Similarly, when the P_pv power decreases, to maintain power balance, the P_bat power increases accordingly.

[0103] (2) P_charge < P_pv:

[0104] Execute the charging system generation demand strategy:

[0105] P_charge = P_bat + P_pv.

[0106] Execute the power dynamic balance strategy:

[0107] P_charge = -P_bat + P_pv↑ & P_charge = -P_bat + P_pv↓.

[0108] The explanation of the above relational expression is: -P_bat represents the battery for charging. The photovoltaic power P_pv in the relational expression is a variable due to the influence of unstable power generation. When the P_pv power rises, to maintain power balance, the -P_bat power decreases accordingly. Similarly, when the P_pv power decreases, to maintain power balance, the -P_bat power increases accordingly, and the battery power plays a stable regulation role.

[0109] Specifically, in step S2, the photovoltaic power components and the battery system jointly provide power for the charging station system as follows:

[0110] Taking the photovoltaic power as the first priority and the battery system as the second priority to provide power for the charging station system;

[0111] When the required power of the charging station system is greater than the sum of the power of the photovoltaic power components and the battery system, if the photovoltaic power meets the preset unstable determination condition, the power supplied to the charging station system is reduced or the power supply to the charging station system is stopped.

[0112] In this embodiment, when the battery SOC is less than 30%, the photovoltaic power is given the first priority and the battery system responds as the second priority. And the following judgments are made:

[0113] (1) P_charging ≥ P_pv + P_bat:

[0114] Execute the charging station stop strategy to stop charging: The photovoltaic power + battery power responds first, with the photovoltaic power as the first priority and the battery power as the second priority. If the photovoltaic power is unstable, the charging power needs to be reduced or charging stopped.

[0115] (2) P_charging < P_pv + P_bat:

[0116] Execute the charging system demand generation strategy: The photovoltaic power + battery power responds first, with the photovoltaic power as the first priority and the battery power as the second priority;

[0117] P_charging = P_pv↑ + -P_bat↓ & P_charging = P_pv↓ + ±P_bat.

[0118] The photovoltaic power + battery power > charging power, with the photovoltaic power as the priority and the battery power playing a role in stabilizing regulation. When the photovoltaic power fluctuates, ±P_bat represents the charge and discharge direction, + means the battery discharges, and - means the battery charges.

[0119] S3. Judge the battery SOC. If the battery SOC is greater than the preset second threshold, the battery system assists the photovoltaic power components to stably grid-connect and generate electricity. Otherwise, the photovoltaic power components give priority to discharging and the battery system does not participate in the regulation.

[0120] In step S3, the battery system assisting the photovoltaic power components to stably grid-connect and generate electricity is specifically as follows:

[0121] Taking the photovoltaic power components as the first priority and the battery system as the second priority, power is supplied to the commercial power, where the battery system provides supplementary power for the photovoltaic power components.

[0122] In this embodiment, the second threshold is taken as 80%. In other equivalent embodiments, it can be adjusted according to the actual situation.

[0123] In this embodiment, when the battery SOC is greater than 80%, the battery assists the photovoltaic to stably grid-connect and generate electricity.

[0124] Specifically as follows:

[0125] (1) Pac > 50% P_mix (P_mix is the rated power of the photovoltaic and energy storage hybrid inverter):

[0126] Execute the grid-connected power generation power dynamic balance strategy: Define the photovoltaic power as the priority discharge power, which is defined as the first priority, and use the battery power as the dynamic adjustment power, which is defined as the second priority;

[0127] Pac = P_bat / P_dc↓ + P_pv↑

[0128] &

[0129] Pac = P_bat / P_dc↑ + P_pv↓.

[0130] Among them, Pac represents the grid power, and P_dc represents the output-side power.

[0131] (2) Pac < 50% P_mix:

[0132] Execute the grid-connected power generation power dynamic balance strategy;

[0133] Pac = -P_bat / P_dc + P_pv↑ & P_charge = ±P_bat / P_dc + P_pv.

[0134] In step S3, the photovoltaic power components give priority to discharging, and the battery system does not participate in the regulation. Specifically:

[0135] The photovoltaic power components give priority to discharging to provide power for the grid, and the battery system does not participate in the regulation;

[0136] When the grid power is less than the first preset ratio of the photovoltaic and energy storage hybrid inverter power, and the power of the photovoltaic power components is greater than the second preset ratio of the photovoltaic and energy storage hybrid inverter power, if the photovoltaic power meets the preset unstable determination condition, then reduce the grid-connected power generation power provided to the grid, or stop providing grid-connected power generation power to the grid.

[0137] In this embodiment, when the battery SOC is less than 80%, the photovoltaic power is defined as the priority discharge power, and the battery does not participate in the dynamic regulation.

[0138] Specifically as follows:

[0139] (1) P_pv > 30% P_mix (P_mix is the rated power of the photovoltaic and energy storage hybrid inverter):

[0140] Execute the grid-connected power generation full-power strategy: Define the photovoltaic power as the priority discharge power, which is defined as the first priority;

[0141] Pac = P_pv↑.

[0142] Execute the grid-connected power generation power reduction strategy: Define the photovoltaic power as the priority discharge power, which is defined as the first priority;

[0143] Pac = Ppv↓.

[0144] Execute the grid-connected power generation power reduction strategy.

[0145] (2) When Ppv ≤ 30%Pmix (Pmix is the rated power of the photovoltaic-storage hybrid inverter) and the Ppv power fluctuates by 50% - 100%:

[0146] Execute the grid-connected power generation power stop strategy and switch to the battery charging strategy: The photovoltaic power is defined as the priority discharge power. If the photovoltaic power is unstable, it is necessary to reduce the grid-connected discharge power or stop charging;

[0147] Ppv↑ = -Pbat↑;

[0148] Ppv↓ = -Pbat↓.

[0149] The currently limited Pac demand power is within 30%. The Ppv power fluctuates between 50% - 100%, which will not affect the power generation power, and the battery is always in the charging state, maintaining a unique state. What changes is the magnitude of the battery charging power.

[0150] In summary, a photovoltaic-storage-charging integrated system and a charging method provided by the present invention have a photovoltaic-storage-charging circuit, can independently use photovoltaic power generation, charge the battery and the charging station system through a photovoltaic-storage hybrid inverter, and at the same time, the storage-charging circuit can also independently use the commercial power to charge and discharge the battery and the charging station system; it can support the charging of the charging station system and the charging and discharging operation of the battery without using commercial power. When there is no vehicle charging, the storage-charging circuit supplies power to the photovoltaic-storage-charging circuit to assist the photovoltaic in stably grid-connected discharge power operation, which can effectively solve the problem of abandoned light in the photovoltaic with a DC coupling structure; at the same time, it can assist in solving the problem of the impact on the commercial power caused by the unstable power generation characteristics of the photovoltaic system, is more friendly to the power grid, and can play a certain supporting role; among them, the dual-channel PCS and the hybrid inverter are connected to the charging circuit of the charging station system independently and are not affected by the battery voltage, and the output voltage can be set higher to improve the charging efficiency of the charging station.

[0151] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A photovoltaic storage and charging fusion charging method based on dynamic scheduling, characterized in that: Includes steps: S1. Determine whether the charging station system has a vehicle charging demand. If so, implement an operation strategy of charging the charging station system and charging and discharging the battery system without using the mains power, and proceed to step S2; S2. The battery SOC is judged. If the battery SOC is greater than a preset first threshold, the battery system is given the first priority and the photovoltaic power module is given the second priority to provide power to the charging station system, wherein the photovoltaic power module provides supplementary power to the battery system to establish a charging demand for a stable output, and then a power dynamic balancing strategy is implemented, with the photovoltaic power module being given the first priority to provide power to the charging station system; Otherwise, the photovoltaic power components and the battery system will be used to provide power to the charging station system.

2. According to the method of claim 1, the photovoltaic storage and charging fusion charging method based on dynamic scheduling is characterized in that: The power dynamic balancing strategy is specifically as follows: The photovoltaic power components are taken as the first priority and the battery system is taken as the second priority to provide power for the charging station system, wherein the battery system provides supplementary power for the photovoltaic power components.

3. According to the method of claim 1, the photovoltaic storage and charging fusion charging method based on dynamic scheduling is characterized in that: In step S2, the photovoltaic power module and the battery system are preferentially used to provide power to the charging station system, specifically: With photovoltaic power as the first priority and battery system as the second priority, power is provided to the charging station system; When the power demand of the charging station system is greater than the sum of the power of the photovoltaic power components and the battery system, if the photovoltaic power meets the preset instability judgment condition, the power provided to the charging station system is reduced or stopped.

4. According to the method of claim 1, the photovoltaic storage and charging fusion charging method based on dynamic scheduling is characterized in that: The first threshold is 30%.

5. A photovoltaic storage and charging fusion system, characterized in that: Including photovoltaic storage hybrid inverter, photovoltaic power module, dual-channel PCS and battery system; The input side DC in the dual-channel PCS is connected to the battery system, the output side DC is connected to the charging station system, and the AC is connected to the power grid; The PV side of the photovoltaic storage hybrid inverter is connected to the photovoltaic power component, the output DC is connected to the charging station system, and the AC is connected to the power grid; The photovoltaic storage hybrid inverter and the dual-channel PCS are both connected to the photovoltaic storage charging system in communication, and the dual-channel PCS is connected to the battery system in communication; The photovoltaic storage and charging fusion system implements the following steps: S1. Determine whether the charging station system has a vehicle charging demand. If so, implement an operation strategy of charging the charging station system and charging and discharging the battery system without using the mains power, and proceed to step S2; S2. The battery SOC is judged. If the battery SOC is greater than a preset first threshold, the battery system is given the first priority and the photovoltaic power module is given the second priority to provide power for the charging station system. The photovoltaic power module provides supplementary power for the battery system to establish a stable output charging demand, and then implement a power dynamic balance strategy; Otherwise, the photovoltaic power components and the battery system will be used to provide power to the charging station system.

6. The photovoltaic storage and charging fusion system according to claim 5, characterized in that: The power dynamic balancing strategy is specifically as follows: The photovoltaic power components are taken as the first priority and the battery system is taken as the second priority to provide power for the charging station system, wherein the battery system provides supplementary power for the photovoltaic power components.

7. The photovoltaic storage and charging fusion system according to claim 5, characterized in that: In step S2, the photovoltaic power module and the battery system are preferentially used to provide power to the charging station system, specifically: With photovoltaic power as the first priority and battery system as the second priority, power is provided to the charging station system; When the power demand of the charging station system is greater than the sum of the power of the photovoltaic power components and the battery system, if the photovoltaic power meets the preset instability judgment condition, the power provided to the charging station system is reduced or stopped.

8. The photovoltaic storage and charging fusion system according to claim 5, characterized in that: The first threshold is 30%.

9. The photovoltaic storage and charging fusion system according to claim 5, characterized in that: The photovoltaic storage hybrid inverter and the dual-channel PCS are both connected to the photovoltaic storage charging system 485 for communication, and the dual-channel PCS is connected to the battery system for CAN communication.

10. The photovoltaic storage and charging fusion system according to claim 5, characterized in that: The photovoltaic-storage hybrid inverter adopts a high-voltage grid-connected inverter. The photovoltaic side of the photovoltaic-storage hybrid inverter has photovoltaic power components that support access to a wide range of high voltages. The output side DC of the photovoltaic-storage hybrid inverter supports outputting high-voltage direct current voltage.

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