Feedback type charging and discharging system and dynamic power control method thereof

Abstract

The invention discloses a feedback type charging and discharging system and a power dynamic control method thereof, and the method comprises the steps: detecting whether a working step is a charging and discharging working step or not after a test process is started, and directly starting the working step if the working step is not the charging and discharging working step; if the working step is the charging working step, comparing the sum of the working step charging power and the used power of the direct current bus with the rated power of the direct current bus, and comparing the sum of the working step charging power and the used power of the direct current bus with the rated power of the PCS cabinet; if yes, comparing the absolute value of the difference between the working step charging power and the used power of the direct current bus with the rated power of the direct current bus, and comparing the absolute value of the difference between the working step charging power and the used power of the direct current bus with the rated power of the PCS cabinet; and according to a comparison result, determining whether to start a charging and discharging step. According to the invention, the operation of the test equipment is controlled through power dynamic limitation, and the effects of peak-shifting energy utilization and efficient energy utilization are achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric power, and particularly relates to a feedback type charging and discharging system and a power dynamic control method thereof. BACKGROUND

[0002] In existing power battery test projects, considering the construction cost, the power grid capacity of the test plant is usually designed according to the average power, but the power battery test equipment (such as the charging and discharging test cabinet) usually needs 380V / 480V high-voltage power supply, and the power of a single device can reach tens to hundreds of kilowatts; therefore, if the whole plant is operated at full load, the total power may exceed the carrying capacity of the plant power grid, resulting in bus voltage drop or triggering of over-current protection tripping.

[0003] In the scenarios of power battery batch production in the production line or precise test in the laboratory, bus voltage drop or over-current protection tripping belongs to a typical "abnormal interruption of power supply", which will affect five core dimensions of equipment safety, test process, battery performance / safety, data validity and production efficiency, and the emphases of the production line and the laboratory are slightly different (the production line pays more attention to batch capacity and cost, and the laboratory pays more attention to data continuity and experimental period); the specific influences are as follows: 1, direct impact: test equipment damage and function failure; 2, test process interruption: batch rework and experimental period delay; 3, implicit risk: power battery performance damage and safety hazard; 4, data validity failure: test results are unusable and do not meet the standards; 5, chain reaction of the production line / laboratory: significant increase in operating costs and process confusion.

[0004] In addition, in the test of power batteries, the general customer group is a large power consumer, and the test equipment is used without limitation, which may cause peak charging and valley discharging, and based on the difference between peak and valley electricity prices, the enterprise electricity expenditure will be significantly increased, and the enterprise operating cost will be increased. Based on this, the industry needs to design a feedback type charging and discharging system and a power dynamic control method to solve the above technical problems. SUMMARY

[0005] In order to solve the above technical problems, the application provides a feedback type charging and discharging system and a power dynamic control method, which has the advantages of optimizing power resource allocation, preventing power grid overload and reducing enterprise electricity cost.

[0006] In order to solve the above technical problems, the application adopts the following technical solutions: The feedback type charge-discharge system comprises a PCS cabinet, a dispatching system, a plurality of test cabinet modules and a plurality of battery modules, at least one test cabinet is included in one test cabinet module, at least one battery pack is included in one battery module, the PCS cabinet and the test cabinet module are respectively in communication connection with the dispatching system, one test cabinet module is connected with the PCS cabinet through one direct current bus, and the test cabinet module is connected with the battery module one by one through a circuit.

[0007] The power dynamic control method based on the feedback type charge-discharge system comprises the following steps: S1, after starting the test process, detecting whether the current working step is a charge-discharge working step; S2, if the working step is not the charge-discharge working step, directly starting the working step to test the battery pack, if the working step is the charge working step, turning to step S3, and if the working step is the discharge working step, turning to step S5; S3, when detecting that the working step is the charge working step, checking whether the sum of the working step charge power P1 and the total power P2 used by the direct current bus is greater than the rated power P3 of the direct current bus before starting the working step, if yes, not starting the working step, and if no, turning to step S4; S4, checking whether the sum of the working step charge power P1 and the power P4 used by the PCS cabinet is greater than the rated power P5 of the PCS cabinet, if no, starting the charge working step, and if yes, not starting the working step; S5, when detecting that the working step is the discharge working step, checking whether the absolute value of the difference between the working step discharge power P1 and the total power P2 used by the direct current bus is greater than the rated power P3 of the direct current bus before starting the working step, if yes, not starting the working step, and if no, turning to step S6; S6, checking whether the absolute value of the difference between the working step discharge power and the power used by the PCS cabinet is greater than the rated power P5 of the PCS cabinet, if yes, starting the discharge working step, and if no, not starting the working step.

[0008] As a further improvement, a peak period, a valley period and a flat section are set, and the rated charge power of the direct current bus is defined; In the step S3, when the working step is the charge working step, the current period is detected, if the current period is the peak period, the rated power P3 of the direct current bus is equal to the rated charge power of the direct current bus multiplied by (1-N2%), if the current period is the valley period, the rated power P3 of the direct current bus is equal to the rated charge power of the direct current bus multiplied by (1+N3%), and if the current period is the flat section, the rated power P3 of the direct current bus is equal to the rated charge power of the direct current bus, and N2% and N3% are coefficients.

[0009] As a further improvement, the rated charge power of the PCS cabinet is defined; The step S4 is kept in the charging work step, the current period is detected, if it is the peak period, the PCS cabinet rated power P5=PCS cabinet rated charging power*(1-N2%); if it is the valley period, the PCS cabinet rated power P5=PCS cabinet rated charging power*(1+N3%); if it is the flat section, the PCS cabinet rated power P5=PCS cabinet rated charging power.

[0010] As a further improvement, the DC bus rated discharge power is defined; The step S5 is in the discharge work step, the current period is detected, if it is the peak period, the DC bus rated power P3=DC bus rated discharge power*(1+N1%); if it is the valley period, the DC bus rated power P3=DC bus rated discharge power*(1-N4%); if it is the flat section, the DC bus rated power P3=DC bus rated discharge power, N1% and N4% are coefficients.

[0011] As a further improvement, the PCS cabinet rated discharge power is defined; The step S6 is kept in the discharge work step, the current period is detected, if it is the peak period, the PCS cabinet rated power P5=PCS cabinet rated discharge power*(1+N1%); if it is the valley period, the PCS cabinet rated power P5=PCS cabinet rated discharge power*(1-N4%); if it is the flat section, the PCS cabinet rated power P5=PCS cabinet rated discharge power.

[0012] As a further improvement, the PCS cabinet is connected with several DC buses, and one DC bus is connected with at least one test cabinet.

[0013] As a further improvement, the test cabinet communicates with the dispatching system through wired or wireless mode, the dispatching system communicates with the PCS cabinet through wired or wireless mode; the dispatching system is a human-computer interface terminal, and the dispatching system is used for signal interaction with the PCS cabinet and the test cabinet.

[0014] The application has the following beneficial technical effects: The total power exceeds the power grid carrying capacity of the factory building, which causes the bus voltage to drop or triggers the overcurrent protection trip, and brings risks to enterprise production testing; the power grid overload is effectively avoided, and the peak and valley period power consumption strategy is optimized, which has the advantages of optimizing power resource allocation, preventing power grid overload and reducing enterprise power consumption cost, achieves peak-shaving energy use and energy efficient use, and realizes more intelligent, efficient and low-cost power control. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings incorporated into the specification and forming a part thereof demonstrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the application.

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the process of the present invention.

[0018] Figure 2 This is a schematic diagram of the system principle of the present invention. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that if terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0022] like Figure 2As shown, the embodiment of the present application proposes a feedback type charging and discharging system, which comprises a PCS cabinet, a scheduling system, a plurality of test cabinet modules and a plurality of battery modules, at least one test cabinet is included in one test cabinet module, at least one battery pack is included in one battery module, the PCS cabinet and the test cabinet module are respectively in communication connection with the scheduling system, one test cabinet module is connected with the PCS cabinet through one DC bus, the test cabinet module is connected with the battery module one by one through a line, that is, one test cabinet corresponds to one battery pack, and one DC bus can connect and control a plurality of test cabinets. The scheduling system can be a man-machine interface terminal, which is internally provided with a controller, and performs signal interaction with the PCS cabinet and the test cabinet to realize control of the test process and control of the start of the work step. The test cabinets in the test cabinet module are distributed in parallel, and the battery packs in the battery module are also distributed in parallel.

[0023] The PCS cabinet is an energy storage converter PCS cabinet, the DC bus refers to a power transmission channel connecting the PCS cabinet and the test cabinet module, which can be specifically realized by a copper bar or a cable, and is used for carrying bidirectional current.

[0024] Reference Figure 1 and 2 As shown, a power dynamic control method based on the feedback type charging and discharging system comprises the following steps: S1, after starting the test process, it is detected whether the current work step is a charging and discharging work step, and the scheduling system is interacted according to the condition of different work steps.

[0025] S2, if it is not a charging and discharging work step, such as in a silent state, the work step is directly started, at this time, information interaction with the scheduling system is not needed, and the battery pack is tested; if it is a charging work step, step S3 is entered; if it is a discharging work step, step S5 is entered, and whether the work step is charging and discharging is identified, which is convenient for subsequent control.

[0026] S3, when it is detected that it is a charging work step, before the work step is started, it is checked whether the sum of the charging power P1 of the work step and the total power P2 of the DC bus is greater than the rated power P3 of the DC bus, if yes, it is indicated that the sum of the total power of the operating equipment controlled by the DC bus at this time and the charging power required by the work step after the work step is started is greater than the rated power of the DC bus, at this time, an overload condition occurs, and if the test is continued, the test equipment may be damaged, therefore, the work step is not started; if no, it is indicated that the work step is started for charging test processing, the total power will not exceed the rated power of the DC bus, and will not be overloaded, and step S4 is entered. P2 is positive for charging, and P2 is negative for discharging.

[0027] S4, check whether the sum of the charging power P1 of the work step and the used power P4 of the PCS cabinet is greater than the rated power P5 of the PCS cabinet, if less, start the charging work step; if greater, do not start the work step. Under the condition of meeting the DC bus rating, the rated power of the PCS cabinet is further checked to ensure that the sum of the total power of each device and the charging power of the work step also does not exceed the rated power of the PCS cabinet.

[0028] S5, when detecting the discharging work step, before starting the work step, check whether the absolute value of the difference between the discharging power P1 of the work step and the total used power P2 of the DC bus is greater than the rated power P3 of the DC bus, if greater, do not start the work step; if less, go to step S6; S6, check whether the absolute value of the difference between the discharging power of the work step and the used power of the PCS cabinet is greater than the rated power P5 of the PCS cabinet, if greater, start the discharging work step; if less, do not start the work step.

[0029] The charging power of the work step refers to the power value required for single charging operation in the test process, which can be realized by real-time collection of the product of the charging current and voltage by a power sensor, and is used to quantify the instantaneous load demand of the charging process on the power grid. The total used power of the DC bus refers to the total power occupied by all currently running charging or discharging work steps on the DC bus, i.e., the total power of all test cabinets actually running corresponding to the connection and control of the DC bus, which is used to evaluate the remaining capacity of the DC bus. The used power of the PCS cabinet refers to the power resource allocated by the PCS cabinet to other test cabinets at present, which can be obtained through the communication interface of the power distribution unit in the cabinet, and is used to judge the remaining power carrying capacity of the PCS cabinet.

[0030] Specifically, when the test process is started, the work step type identification module is first used to judge whether the current operation is charging, discharging or non-charging and discharging work step. If it is a non-charging and discharging work step, the regular test process is directly executed; if it is a charging work step, the system will successively execute two levels of power verification before starting: the first level of verification superimposes the work step charging power and the real-time load of the DC bus, and compares it with the bus rated power, if it exceeds the rated value, it is prohibited to start to avoid bus overload; if it does not exceed, the second level of verification is entered, which superimposes the work step charging power and the current load of the PCS cabinet, and compares it with the rated power of the PCS cabinet, to ensure that the device level power does not exceed the limit. For the discharging work step, the difference value verification logic is used, which calculates the absolute value of the difference between the work step discharging power and the used power of the bus, to judge whether the discharging operation will cause the bus reverse power to exceed the rated range, if it does not exceed, the power margin of the PCS cabinet is further checked, so as to maintain the stability of the power grid in the energy feedback process.

[0031] By using the hierarchical checking mechanism, the superimposed checking is adopted in the charging scenario to prevent the forward power from exceeding the limit, and the difference checking is adopted in the discharging scenario to control the reverse power fluctuation, so as to realize the dynamic power coordination in the charging and discharging process, and cover the power safety boundary of the bus level and the PCS device level. The power overload tripping of the power grid caused by the power superposition of the test equipment during the batch charging and discharging can be effectively avoided, the test interruption times are reduced, the continuity of the power battery test data and the equipment operation safety are ensured. At the same time, through the power prediction mechanism of the charging and discharging steps, potential overload operations can be actively intercepted before the steps are started, the implicit damage to the battery performance caused by abnormal interruption is avoided, and the reliability of the test process is improved.

[0032] In addition, in order to realize accurate control in different time periods, peak-valley control is also performed in the charging and discharging process.

[0033] In one aspect, in the charging process of the power dynamic control method: a peak period, a valley period and a flat period are set, and a direct current bus rated charging power is defined; In the step S3, when the charging step is in the charging step, the current period is detected, if it is the peak period, the direct current bus rated power P3=direct current bus rated charging power×(1-N2%); if it is the valley period, the direct current bus rated power P3=direct current bus rated charging power×(1+N3%); if it is the flat period, the direct current bus rated power P3=direct current bus rated charging power, N2% and N3% are coefficients. According to the use condition, the peak period, the valley period and the flat period are flexibly set.

[0034] a PCS cabinet rated charging power is defined; In the step S4, when the charging step is kept in the charging step, the current period is detected, if it is the peak period, the PCS cabinet rated power P5=PCS cabinet rated charging power×(1-N2%); if it is the valley period, the PCS cabinet rated power P5=PCS cabinet rated charging power×(1+N3%); if it is the flat period, the PCS cabinet rated power P5=PCS cabinet rated charging power.

[0035] The peak period refers to a time period with high power demand, which can be divided by using the grid load monitoring data, for example, the time period from 9:00 to 12:00 and from 18:00 to 21:00 every day. The valley period refers to a time period with low power demand, for example, the time period from 0:00 to 6:00 every day. The flat period refers to a time period with power demand between the peak period and the valley period. The direct current bus rated charging power refers to the maximum charging power value that the direct current bus can bear when the system is designed, which can be set by the rated parameters of the equipment. N2% and N3% refer to the adjustment coefficients set according to the grid bearing capacity and the electricity price strategy, for example, N2% can be 5%, and N3% can be 8%.

[0036] Specifically, before the start of the charging step, the system determines the current time period according to the preset time period division rule. If it is in the peak period, the DC bus rated power is adjusted to (1-N2%) of the rated charging power, for example, when N2% is 5%, the actual available power is reduced to 95%. This adjustment avoids the risk of grid overload by actively reducing the upper limit of the charging power. If it is in the valley period, the rated power is increased to (1+N3%), for example, when N3% is 8%, the available power is increased to 108%, so as to fully utilize the surplus power resources in the valley period. The flat section maintains the rated power unchanged to ensure the normal operation demand.

[0037] The PCS cabinet rated charging power refers to the maximum charging power value that the PCS cabinet is allowed to output under standard working conditions, which can be realized by using device nominal parameters or system configuration parameters, and is used as a reference value for power adjustment.

[0038] Specifically, during the execution of the charging step, the rated power limit of the PCS cabinet is dynamically adjusted by real-time detection of the current time period type. When in the peak period, the PCS cabinet rated power is reduced by N2%, for example, the original rated power 200kW is adjusted to 190kW (when N2% is 5%), thereby reducing the power load of the grid during the peak period. When in the valley period, the rated power is increased by N3%, for example, the original rated power 200kW is adjusted to 220kW (when N3% is 10%), so as to fully utilize the redundant capacity of the grid in the valley period. In the flat period, the rated power remains unchanged. This dynamic adjustment mechanism is realized by a power control module, for example, a PLC controller is used to link with the grid time period signal to ensure that the charging power is always matched with the grid carrying capacity.

[0039] The present scheme avoids the voltage drop or tripping problem caused by grid overload in the peak period, and also improves the charging efficiency in the valley period. For example, in the scenario of limited grid capacity, actively reducing the power in the peak period can prevent the total power from exceeding the standard due to simultaneous charging of multiple devices.

[0040] The present application solves the problem of grid capacity overlimit caused by concentrated charging of test equipment in the peak period, and also increases the upper limit of the charging power in the valley period to realize efficient use of power resources. For example, in the laboratory continuous test scenario, the system can automatically adjust the charging power according to the time period, which not only avoids the invalidation of test data caused by abnormal interruption of the grid, but also accelerates the charging in the valley period to shorten the experimental period.

[0041] The overload tripping problem caused by the centralized charging of the test equipment during the power grid peak period is solved, and the charging power is increased during the valley period to reduce the electricity cost. The dynamic adjustment of the charging power keeps the total power consumption within the safe carrying range of the power grid, ensuring the continuous and stable operation of the test process and significantly reducing the electricity expenditure of the enterprise.

[0042] In one aspect, the power dynamic control method has a discharging step: The DC bus rated discharging power is defined. In the step S5, when the discharging step is executed, the current period is detected. If it is a peak period, the DC bus rated power P3 = DC bus rated discharging power × (1 + N1%); if it is a valley period, the DC bus rated power P3 = DC bus rated discharging power × (1 - N4%); if it is a flat period, the DC bus rated power P3 = DC bus rated discharging power, and N1% and N4% are coefficients.

[0043] The PCS cabinet rated discharging power is defined. In the step S6, when the discharging step is maintained, the current period is detected. If it is a peak period, the PCS cabinet rated power P5 = PCS cabinet rated discharging power × (1 + N1%); if it is a valley period, the PCS cabinet rated power P5 = PCS cabinet rated discharging power × (1 - N4%); if it is a flat period, the PCS cabinet rated power P5 = PCS cabinet rated discharging power.

[0044] Specifically, before the discharging step is executed, first determine the type of the current period. If it is a peak period, the DC bus rated power is dynamically adjusted to (1 + N1%) of the rated discharging power, for example, N1% can be 5% or 10%, so as to allow the DC bus discharging capacity to be moderately increased when the power grid load is high to support the test demand. If it is a valley period, the DC bus rated power is adjusted to (1 - N4%) of the rated discharging power, for example, N4% can be 8% or 12%, so as to reduce the operating pressure of the bus when the power grid capacity is sufficient to prolong the service life of the equipment. If it is a flat period, the rated discharging power remains unchanged. This adjustment process obtains the period information in real time through the scheduling system and calculates the power threshold, ensuring that the power demand of the discharging step and the carrying capacity of the bus are dynamically matched, avoiding the voltage drop or protection tripping of the bus due to power overrun.

[0045] If in the peak period, the PCS cabinet rated power is dynamically increased to (1+N1%) times of the rated discharge power, so that the discharge power output capability is enhanced to adapt to the high load demand of the power grid and realize economic benefits in the high price period. If in the valley period, the PCS cabinet rated power is reduced to (1-N4%) times of the rated discharge power, thereby reducing energy consumption in the low price period and avoiding resource waste. In the flat period, the standard rated power is maintained to ensure the stability of the test process. The dynamic adjustment mechanism realizes the coordinated optimization of power output and operating cost by real-time matching of the grid state and price strategy.

[0046] The application introduces a period perception and dynamic power adjustment mechanism, so that the DC bus rated power can be self-adaptive to the grid load state, which not only improves the upper limit of discharge capacity in the peak period, but also optimizes the resource utilization rate in the valley period, thereby reducing the risk of grid impact while ensuring the continuity of the test.

[0047] The application can effectively alleviate the problem of grid overload caused by concentrated peak discharge demand in the power battery test process, and at the same time, reduce the bus operating pressure in the valley period to prolong the service life of the equipment. By dynamically adapting the grid carrying capacity in different periods, the test interruption or equipment damage caused by fixed power setting is avoided, and the data invalidation and operating cost increase caused by power supply abnormalities are further reduced.

[0048] By introducing period detection and dynamic coefficient adjustment, the discharge power output can actively adapt to the changes in the external grid environment, which not only avoids the risk of equipment overload, but also improves the economic efficiency of energy utilization.

[0049] Therefore, through two-level verification, the dispatching system replies whether the current requested test step can be enabled according to the comparison result, and when enabled, the test step starts running to test the battery pack. The application does not need additional hardware structure for control, and does not need to control the closing and opening of the AC / DC module, which reduces the hardware damage rate, avoids the adverse effects on enterprises caused by power overload, and achieves the effects of peak-shifting energy use and energy efficient use.

[0050] Those skilled in the art can understand that all or part of the processes in the method of implementing the above embodiments can be completed by a computer program instructing related hardware. The computer program can be stored in a storage medium, which is a computer readable storage medium. The computer program is executed by at least one processor in the computer system to realize the process steps of the above-mentioned embodiment of the method.

[0051] Those skilled in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been described in general terms in the above description. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions, but such implementation should not be considered beyond the scope of the present application.

[0052] In several embodiments provided by the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of each unit is only a logical function division, and actual implementation can have another division manner. For example, a unit or component can be combined or integrated into another system, or some features can be ignored or not executed.

[0053] The steps in the method embodiments of the present application can be adjusted, combined and deleted in sequence according to actual needs. The units in the device embodiments of the present application can be combined, divided and deleted according to actual needs. In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0054] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a storage medium. Based on such understanding, the technical solutions of the present application essentially or say the parts that make contributions to the prior art, or the whole or part of the technical solutions can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a plurality of instructions to make a computer device (which can be a personal computer, terminal or network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.

[0055] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0056] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, these modifications and variations of the present application are intended to be included within the scope of the claims of the present application and their equivalent technologies. Therefore, the present application also intends to include these modifications and variations.

[0057] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A regenerative charging and discharging system, characterized in that, It includes a PCS cabinet, a scheduling system, several test cabinet modules and several battery modules. Each test cabinet module includes at least one test cabinet, and each battery module contains at least one battery pack. The PCS cabinet and the test cabinet modules are respectively connected to the scheduling system. Each test cabinet module is connected to the PCS cabinet through a DC bus, and each test cabinet module is connected to a battery module through a line.

2. A power dynamic control method based on the regenerative charging and discharging system according to claim 1, characterized in that, Includes the following steps: S1, after starting the test process, check whether the current step is a charge / discharge step; S2. If it is not a charging / discharging step, start the step directly to test the battery pack; if it is a charging step, proceed to step S3; if it is a discharging step, proceed to step S5. S3. When a charging step is detected, before starting the step, check whether the sum of the charging power P1 of the step and the total power used by the DC bus P2 is greater than the rated power P3 of the DC bus. If it is greater, the step is not started; if it is less, proceed to step S4. S4. Check if the sum of the charging power P1 of the process step and the power used by the PCS cabinet P4 is greater than the rated power P5 of the PCS cabinet. If it is less, start the charging process step; if it is greater, do not start the process step. S5. When a discharge step is detected, before starting the step, check whether the absolute value of the difference between the discharge power P1 of the step and the total power used by the straight bus P2 is greater than the rated power P3 of the DC bus. If it is greater, the step is not started; if it is less, proceed to step S6. S6. Check if the absolute value of the difference between the discharge power of the working step and the power used by the PCS cabinet is greater than the rated power P5 of the PCS cabinet. If it is greater, start the discharge working step; if it is less, do not start the working step.

3. The power dynamic control method according to claim 2, characterized in that, Set peak hours, off-peak hours, and normal hours, and define the rated charging power of the DC bus; In step S3, when the charging process is underway, the current time period is detected. If it is a peak period, the rated power of the DC bus P3 = rated charging power of the DC bus × (1-N2%); if it is a low period, the rated power of the DC bus P3 = rated charging power of the DC bus × (1+N3%); if it is a flat period, the rated power of the DC bus P3 = rated charging power of the DC bus, where N2% and N3% are coefficients.

4. The power dynamic control method according to claim 3, characterized in that, Define the rated charging power of the PCS cabinet; In step S4, while maintaining the charging process, the current time period is detected. If it is a peak period, the rated power of the PCS cabinet P5 = the rated charging power of the PCS cabinet × (1-N2%); if it is an off-peak period, the rated power of the PCS cabinet P5 = the rated charging power of the PCS cabinet × (1+N3%); if it is a flat period, the rated power of the PCS cabinet P5 = the rated charging power of the PCS cabinet.

5. The power dynamic control method according to claim 4, characterized in that, Define the rated discharge power of the DC bus; In step S5, when the discharge process is underway, the current time period is detected. If it is a peak period, the rated power of the DC bus P3 = rated discharge power of the DC bus × (1 + N1%); if it is a low period, the rated power of the DC bus P3 = rated discharge power of the DC bus × (1 - N4%); if it is a flat period, the rated power of the DC bus P3 = rated discharge power of the DC bus, where N1% and N4% are coefficients.

6. The power dynamic control method according to claim 5, characterized in that, Define the rated discharge power of the PCS cabinet; In step S6, while maintaining the discharge process, the current time period is detected. If it is a peak period, the rated power of the PCS cabinet P5 = the rated discharge power of the PCS cabinet × (1 + N1%); if it is a low period, the rated power of the PCS cabinet P5 = the rated discharge power of the PCS cabinet × (1 - N4%); if it is a flat period, the rated power of the PCS cabinet P5 = the rated discharge power of the PCS cabinet.

7. The power dynamic control method according to claim 2, characterized in that, The PCS cabinet is connected to several DC buses, and each DC bus is connected to at least one test cabinet for control.

8. The power dynamic control method according to claim 2, characterized in that, The test cabinet communicates with the scheduling system via wired or wireless means, and the scheduling system communicates with the PCS cabinet via wired or wireless means; the scheduling system is a human-machine interface terminal, used for signal interaction with the PCS cabinet and the test cabinet.

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