Method for controlling output level of out-phase energy storage module of energy storage system and related equipment
By adopting the out-of-phase energy storage module output level control method in the energy storage system and using the logic module to modify the switch tube driving signal, the problems of delay and transient fluctuations in the output level control of the energy storage system are solved, and efficient and stable output level control is achieved.
Patent Information
- Application Number
- CN202411820551.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-03-11
AI Technical Summary
The output level control method in existing energy storage systems has problems of delay and transient fluctuations.
By adopting the out-of-phase energy storage module output level control method in the energy storage system, the rise logic module and the down-of-level logic module modify the original driving signal of the switching tube of the energy storage module to realize direct control of the output level of the energy storage module, and the stability of the line voltage output level of the high-voltage square energy storage system is ensured through compensation of the out-of-phase energy storage module.
This method can quickly respond to output level changes, reduce transient fluctuations, and improve the output level control accuracy and stability of the energy storage system.
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Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of energy storage systems, and in particular relates to an output level control method for out-of-phase energy storage modules of an energy storage system and related equipment. Background Art
[0002] As an important part of building a new power system, the energy storage system is of great significance to improving the safe and stable operation of the dual-high power system. At the same time, it plays a key role in smoothing the fluctuations in new energy output, shaving peaks and filling valleys, and improving power quality.
[0003] Existing large-capacity energy storage systems mostly use power conversion devices based on two-level / three-level topology structures to convert the DC power output by the battery unit into AC power that can be connected to the power grid. Whether it is a centralized or decentralized energy storage system, it has the advantages of easy capacity expansion, mature control technology, and simple system structure. However, it also faces problems such as multi-machine parallel circulation, low battery unit circulation efficiency, slow power response speed of the energy storage system, and low system energy conversion efficiency.
[0004] In contrast, the high-voltage cascade energy storage system based on the cascade multi-level converter achieves direct operation on the medium-voltage grid without a step-up transformer by connecting the AC output ends of multiple H-bridge units in series, which has obvious advantages in terms of overall system conversion efficiency and power density. At the same time, since the battery modules connected to the DC side of each H-bridge unit are independent of each other, the direct series and parallel connection of a large number of battery cells is avoided, effectively improving the battery cycle efficiency. Compared with the distributed energy storage system, the single-unit capacity is higher and the response speed is faster after the power reference command is issued.
[0005] Since multiple energy storage modules are integrated in the high-voltage cascade energy storage system and operate as a whole system, in order to ensure the consistency of operation of each energy storage module in the system and avoid overcharging or over-discharging of individual battery modules that affect the safe operation of the system, reduce the overall capacity of the system, and shorten the operating life of the system, the input or output power of each energy storage module needs to have flexible adjustment capabilities.
[0006] The existing methods for adjusting the input or output power of energy storage modules mostly modify the amplitude and phase of their reference signals, and there is a certain delay from the reference signal being given to the actual input or output power changing. When the input or output power of individual energy storage modules needs to change significantly, the output voltage of the cascaded multilevel converter will experience transient fluctuations. Summary of the invention
[0007] The object of the present invention is to provide a method for controlling the output level of out-of-phase energy storage modules of an energy storage system and related equipment, so as to solve the technical problems of time delay and transient fluctuation in the output level control method of the energy storage system in the prior art.
[0008] In order to achieve the above object, the present invention adopts the following technical scheme: A method for controlling output levels of out-of-phase energy storage modules of an energy storage system comprises the following steps: Input the phase sequence and intra-phase sequence number of the energy storage module for output level adjustment, the type of output level adjustment and the output level adjustment enable signal; According to the type of output level adjustment of the energy storage module, the original drive signal of the switch tube of the energy storage module is modified using a level-up logic module or a level-down logic module; According to the type of output level adjustment of the energy storage module and the level adjustment enable signal, a level reduction logic module or a level increase logic module is used to modify the original drive signal of the switch tube of any other energy storage module that is out of phase with the energy storage module to offset the output level change of the energy storage module and ensure that the line voltage output level of the high-voltage cascade energy storage system remains unchanged.
[0009] Furthermore, the types of output level adjustment include level increase and level decrease, and the output level adjustment enable signal includes a level increase enable signal and a level decrease enable signal.
[0010] Further, the level-raising logic module includes a first OR gate, a first NOT gate, a second NOT gate, a third NOT gate, a first AND gate and a second AND gate, the output of the first OR gate is connected to the first NOT gate, the output of the first AND gate is connected to the input of the second NOT gate, the output of the second NOT gate is connected to the second AND gate, and the output of the second AND gate is connected to the third NOT gate; Any of the energy storage modules includes four-way switch tube original drive signals.
[0011] Furthermore, the logic expression of the level-raising logic module is:
[0012] in, g ij1 , g ij2 , g ij3 , g ij4 Respectively represent the original driving signals of the four switch tubes of the energy storage module, g ij1P , g ij2P , g ij3P , g ij4P They represent the original drive signals of the four switch tubes of the energy storage module after passing through the level-boosting logic module, P ij Indicates the level-up enable signal of the energy storage module; g ij2and P ij is the input of the first OR gate, g ij2P is the output of the first OR gate, g ij1P is the output of the first NOT gate, P ij , g ij1 and g ij3 is the input of the first AND gate, and one input of the second AND gate is g ij3 , the output of the second AND gate is g ij3P , g ij4P is the output of the third NOT gate.
[0013] Furthermore, the level reduction logic module includes a second OR gate, a fourth NOT gate, a fifth NOT gate, a sixth NOT gate, a third AND gate and a fourth AND gate, the output of the second OR gate is connected to the fourth NOT gate, the output of the third AND gate is connected to the input of the fifth NOT gate, the output of the fifth NOT gate is connected to the input of the fourth AND gate, and the output of the fourth AND gate is connected to the input of the sixth NOT gate.
[0014] Furthermore, the logic expression of the level reduction logic module is:
[0015] in, g ij1N , g ij2N , g ij3N , g ij4N They represent the original driving signals of the four switch tubes of the energy storage module after passing through the level reduction logic module, N ij Indicates the level reduction enable signal of the energy storage module; g ij1 and N ij is the input of the second OR gate, and one output of the second OR gate is g ij1N , g ij2N is the output of the fourth NOT gate, N ij , g ij2 and g ij4 is the input of the third AND gate, and one input of the fourth AND gate is g ij4 , the output of the fourth AND gate is g ij4N , gij3N It is the output of the sixth NOT gate.
[0016] Furthermore, the method of modifying the original drive signal of the switch tube of any other energy storage module out of phase with the energy storage module by using the level reduction logic module or the level increase logic module according to the type of the energy storage module output level adjustment includes: When the energy storage module uses the level-raising logic module to adjust the level, any other energy storage module out of phase uses the level-raising logic module to adjust the level; When the energy storage module uses the level reduction logic module to perform level reduction adjustment, any other energy storage module out of phase uses the level reduction logic module to perform level reduction adjustment.
[0017] Furthermore, when the energy storage module uses the level-raising logic module to perform level-raising adjustment, the condition for any other energy storage module out of phase to use the level-raising logic module to perform level-raising adjustment is: The enable signal corresponding to any energy storage module is a rising level enable signal; Any energy storage module outputs a negative level or a zero level before adjustment.
[0018] When the energy storage module uses the level reduction logic module to perform level reduction adjustment, the condition for any other energy storage module out of phase to use the level reduction logic module to perform level reduction adjustment is: The enable signal corresponding to any energy storage module is a level-falling enable signal; Any energy storage module outputs a positive level or a zero level before adjustment.
[0019] In a second aspect, an energy storage system out-of-phase energy storage module output level control system includes an output module, a modification module and a control module, wherein: Output module: used to input the phase sequence and phase number of the energy storage module for output level adjustment, the type of output level adjustment and the output level adjustment enable signal; Modification module: used to modify the original drive signal of the switch tube of the energy storage module using the level-up logic module or the level-down logic module according to the type of output level adjustment of the energy storage module; Control module: used to modify the original drive signal of the switch tube of any other energy storage module that is out of phase with the energy storage module using the level reduction logic module or the level increase logic module according to the type of output level adjustment of the energy storage module and the level adjustment enable signal, so as to offset the output level change of the energy storage module and ensure that the line voltage output level of the high-voltage cascade energy storage system remains unchanged.
[0020] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides an output level control method for out-of-phase energy storage modules of an energy storage system. The output level of the energy storage module is directly controlled by modifying the driving signal of the switch tube in the power module. The change of the output level of the energy storage module is compensated by the output level of any energy storage module in other phases. Similarly, the driving signal of the switch tube in the power module is modified and directly controlled to ensure that the line voltage output level of the high-voltage cascade energy storage system remains unchanged. The modification of the switch tube driving signal in the power module is realized by logical operation, and there is no need to modify the reference signal of the energy storage module. The method has the advantages of a wide range of applicable modulation strategies and a fast output level response speed. The switch tube driving signal of the energy storage module is directly modified by logical operation. Compared with modifying the reference signal of the energy storage module, the control of the output level of the AC side of the energy storage module has a faster response speed. At the same time, through the homogenization control of the output level of the out-of-phase energy storage module, the line voltage output level of the high-voltage cascade energy storage system can be kept unchanged, and the method has good transient characteristics. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a flow chart of a method for controlling output levels of out-of-phase energy storage modules of an energy storage system according to an embodiment of the present invention; Figure 2 It is the topological structure diagram of the high voltage cascade energy storage system; Figure 3 This is the structure diagram of the level-raising logic module; Figure 4 It is the structure diagram of the level reduction logic module; Figure 5 A schematic diagram of the present invention using a level reduction logic module to modify the original drive signal of the switch tube of any other energy storage module that is out of phase with the energy storage module ik; Figure 6 This is a schematic diagram of using a level-boosting logic module in the present invention to modify the original drive signal of the switch tube of any other energy storage module that is out of phase with the energy storage module ik. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0023] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.
[0024] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.
[0025] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.
[0026] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.
[0027] like Figure 2 As shown, the structure of the high-voltage cascade energy storage system is first introduced. The high-voltage cascade energy storage system adopts a three-phase cascade H-bridge converter topology. Each phase is composed of n energy storage modules. The energy storage module consists of an H-bridge topology, a battery unit, a bypass switch, a DC capacitor, a DC inductor, a pre-charging circuit, and a DC circuit breaker. The AC side of the n energy storage modules in each phase is connected in series and then connected to the AC inductor to access the grid. The circuit structure of the energy storage module in each phase is as shown in Figure 2 As shown, any energy storage module includes four-way switch tube original drive signals.
[0028] The present invention is further described in detail below in conjunction with the accompanying drawings: like Figure 1 As shown, a method for controlling the output level of out-of-phase energy storage modules of an energy storage system comprises the following steps: Step 1: Input the phase sequence and phase number of the energy storage module for output level adjustment, the type of output level adjustment and the output level adjustment enable signal: Specifically, the phase sequence of the energy storage module input for output level adjustment i 、Phase serial number k , the type of output level adjustment (level up or level down) and the output level adjustment enable signal P ik (Level-up enable signal), N ik (Level-down enable signal).
[0029] Step 2: According to the type of output level adjustment of the energy storage module, the original drive signal of the switch tube of the energy storage module is modified using a level-up logic module or a level-down logic module; When the energy storage module needs to be level adjusted, the level adjustment type output in step 1 and the corresponding level-up logic module or level-down logic module are used for adjustment; The structure of the level-up logic module involved is as follows: Figure 3 As shown, its logical expression is:
[0030] in, g ij1 , g ij2 , g ij3 , g ij4 Respectively represent the original driving signals of the four switch tubes of the energy storage module, g ij1P , g ij2P , g ij3P , g ij4P They represent the original drive signals of the four switch tubes of the energy storage module after passing through the level-boosting logic module, P ij Indicates the level-up enable signal of the energy storage module; The level-raising logic module includes a first OR gate, a first NOT gate, a second NOT gate, a third NOT gate, a first AND gate and a second AND gate. The output of the first OR gate is connected to the first NOT gate, the output of the first AND gate is connected to the input of the second NOT gate, the output of the second NOT gate is connected to the second AND gate, and the output of the second AND gate is connected to the third NOT gate. g ij2 and P ij is the input of the first OR gate, g ij2P is the output of the first OR gate, g ij1P is the output of the first NOT gate, P ij , g ij1 and g ij3 is the input of the first AND gate, and one input of the second AND gate is g ij3 , the output of the second AND gate is g ij3P , g ij4P is the output of the third NOT gate.
[0031] Similarly, the level reduction logic module structure involved is as follows Figure 4 As shown, its logical expression is:
[0032] in, g ij1N , g ij2N , g ij3N , g ij4N They represent the original driving signals of the four switch tubes of the energy storage module after passing through the level reduction logic module, N ij Indicates the level reduction enable signal of the energy storage module; The level reduction logic module includes a second OR gate, a fourth NOT gate, a fifth NOT gate, a sixth NOT gate, a third AND gate and a fourth AND gate, wherein the output of the second OR gate is connected to the fourth NOT gate, the output of the third AND gate is connected to the input of the fifth NOT gate, the output of the fifth NOT gate is connected to the input of the fourth AND gate, and the output of the fourth AND gate is connected to the input of the sixth NOT gate. g ij1 and N ij is the input of the second OR gate, and one output of the second OR gate is g ij1N , g ij2N is the output of the fourth NOT gate, N ij , g ij2 and g ij4 is the input of the third AND gate, and one input of the fourth AND gate is g ij4 , the output of the fourth AND gate is g ij4N , g ij3N It is the output of the sixth NOT gate.
[0033] Step 3: According to the type of output level adjustment of the energy storage module and the level adjustment enable signal, a level reduction logic module or a level increase logic module is used to modify the original drive signal of the switch tube of any other energy storage module that is out of phase with the energy storage module, so as to offset the output level change of the energy storage module and ensure that the sum of the output levels of all energy storage modules in the whole phase remains unchanged; Specifically, according to the type of output level adjustment of the energy storage module, using the level reduction logic module or the level increase logic module to modify the original drive signal of the switch tube of any other energy storage module that is out of phase with the energy storage module includes: When the energy storage module uses the level-raising logic module to adjust the level, any other energy storage module out of phase also uses the level-raising logic module to adjust the level, so as to ensure that the sum of the output levels of all energy storage modules in the same phase remains unchanged; When the energy storage module uses the level reduction logic module to perform level reduction adjustment, any other energy storage module out of phase also uses the level reduction logic module to perform level reduction adjustment to ensure that the sum of the output levels of all energy storage modules in the same phase remains unchanged.
[0034] On the other hand, when the energy storage module uses the level-boosting logic module to perform level-boosting adjustment, the conditions for any other energy storage module out of phase to use the level-boosting logic module to perform level-boosting adjustment are: The enable signal corresponding to any energy storage module is a rising level enable signal; Any energy storage module outputs a negative level or a zero level before adjustment.
[0035] When the energy storage module uses the level reduction logic module to perform level reduction adjustment, the condition for any other energy storage module out of phase to use the level reduction logic module to perform level reduction adjustment is: The enable signal corresponding to any energy storage module is a level-falling enable signal; Any energy storage module outputs a positive level or a zero level before adjustment.
[0036] In one embodiment of the present invention, Figure 5 As shown, when the energy storage module ik uses the level-raising logic module to adjust the level, the process of any other energy storage module out of phase using the level-raising logic module to adjust the level is: The energy storage module ik outputs a positive level and a rising level enable signal, and any other energy storage module out of phase receives the rising level enable signal; The conditions for the level-up logic module to make level-down adjustments are: The enable signal corresponding to any energy storage module is a rising level enable signal; Any energy storage module outputs a negative level or a zero level before adjustment.
[0037] The prerequisite for the out-of-phase energy storage module to increase the level is: The level-raising logic module corresponding to the out-of-phase energy storage module works. Furthermore, the prerequisite for the level-raising logic module to work is that in addition to the two conditions mentioned in the above steps, the circuit corresponding to the out-of-phase energy storage module also needs g dj1 , g dj4 The original driving signals of the two switch tubes are not 1 at the same time; It should be noted that g dj1 , gdj4 The d in the two switch tubes represents the other two phases except the phase where the energy storage module where the change is located. g dj1 , g dj4 It also represents the original driving signals of the two switching tubes.
[0038] The level-raising enable signal corresponding to the first energy storage module of the phase is the same as the output level-raising enable signal, both of which are 1. Whether the level-raising logic modules in the second to nth modules in the phase work or not is controlled by the original drive signal and the level-raising enable signal of the switch tube of the previous energy storage module. The two original drive signals and the level-raising enable signal of the switch tube of the previous energy storage module are used as inputs of the AND gate. The level-raising logic module that works is the logic module whose level-raising enable signal corresponding to the last level-raising logic module is 1. Correspondingly, the level-raising enable signals corresponding to the level-raising logic modules before the level-raising logic module are all 1, but do not play a role, and the level-raising enable signals corresponding to the level-raising logic modules after the level-raising logic module are all 0, which also do not play a role; If the level-up logic module corresponding to the third energy storage module is in effect, the following is the logic process: The first module corresponds to the level-raising logic module corresponding to the level-raising enable signal P d1 The same as the output level-up enable signal is 1, but at this time g d11 , g d14 The original drive signals of the two switch tubes are 1 at the same time, and the module does not work. The input of the AND gate of the level-raising logic module of the second energy storage module is the level-raising enable signal. P d1 , g d11 , g d14 The original driving signal of the two switch tubes, then the output of the AND gate P d2 is 1, but at this time g d21 , g d24 The original drive signals of the two switch tubes are 1 at the same time, and the module also does not work. Similarly, the level-raising enable signal corresponding to the level-raising logic module of the third energy storage module P d3 is 1, then g d31 , g d34The original drive signals of the two switch tubes are not 1 at the same time, and the module works. The input of the fourth energy storage module and gate is the rising level enable signal. P d3 , g d31 , g d34 The original driving signal of the two switch tubes, the output of the AND gate at this time P d4 is 0, that is, the module will not function, and the level-raising enable signals of the 4th to nth modules thereafter are all 0, and none of them function.
[0039] like Figure 6 As shown, the level-down logic module and the level-up logic module have the same working principle, the difference is that the input of the AND gate corresponding to the level-down logic module is the level-down enable signal of the previous energy storage module and the level-up enable signal of the previous energy storage module. g dj2 , g dj3 The original driving signals of the two switching tubes.
[0040] In yet another embodiment of the present invention, there is also provided an energy storage system out-of-phase energy storage module output level control system, comprising an output module, a modification module and a control module, wherein: Output module: used to input the phase sequence and phase number of the energy storage module for output level adjustment, the type of output level adjustment and the output level adjustment enable signal; Modification module: used to modify the original drive signal of the switch tube of the energy storage module using the level-up logic module or the level-down logic module according to the type of output level adjustment of the energy storage module; Control module: used to modify the original drive signal of the switch tube of any other energy storage module that is out of phase with the energy storage module using the level reduction logic module or the level increase logic module according to the type of output level adjustment of the energy storage module and the level adjustment enable signal, so as to offset the output level change of the energy storage module and ensure that the sum of the output levels of all energy storage modules in the whole phase remains unchanged.
[0041] The present invention discloses a method for controlling the output level of out-of-phase energy storage modules of a high-voltage cascade energy storage system. The output level of the energy storage module is directly controlled by modifying the driving signal of a switch tube in a power module. The change in the output level of the energy storage module is compensated by the output level of any energy storage module in other phases. Similarly, the driving signal of the switch tube in the power module is modified and directly controlled to ensure that the line voltage output level of the high-voltage cascade energy storage system remains unchanged. The modification of the switch tube driving signal in the power module is achieved through logical operation, and there is no need to modify the reference signal of the energy storage module. The method has the advantages of a wide range of applicable modulation strategies, a fast output level response speed, and the like.
[0042] The above contents are only for explaining the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.
Claims
1. A method for controlling the output level of out-of-phase energy storage modules of an energy storage system, characterized in that: The following steps are involved: Input the phase sequence and intra-phase sequence number of the energy storage module for output level adjustment, the type of output level adjustment and the output level adjustment enable signal; According to the type of output level adjustment of the energy storage module, the original drive signal of the switch tube of the energy storage module is modified using a level-up logic module or a level-down logic module; According to the type of output level adjustment of the energy storage module and the level adjustment enable signal, a level reduction logic module or a level increase logic module is used to modify the original drive signal of the switch tube of any other energy storage module that is out of phase with the energy storage module to offset the output level change of the energy storage module and ensure that the line voltage output level of the high-voltage cascade energy storage system remains unchanged.
2. A method for controlling the output level of out-of-phase energy storage modules of an energy storage system according to claim 1, characterized in that: The types of output level adjustment include level increase and level decrease, and the output level adjustment enable signal includes a level increase enable signal and a level decrease enable signal.
3. The method for controlling the output level of out-of-phase energy storage modules of an energy storage system according to claim 1, characterized in that: The level-raising logic module comprises a first OR gate, a first NOT gate, a second NOT gate, a third NOT gate, a first AND gate and a second AND gate, wherein the output of the first OR gate is connected to the first NOT gate, the output of the first AND gate is connected to the input of the second NOT gate, the output of the second NOT gate is connected to the second AND gate, and the output of the second AND gate is connected to the third NOT gate; Any of the energy storage modules includes four-way switch tube original drive signals.
4. A method for controlling output levels of out-of-phase energy storage modules of an energy storage system according to claim 3, characterized in that: The logical expression of the level-raising logic module is: in, g ij1 , g ij2 , g ij3 , g ij4 Respectively represent the original driving signals of the four switch tubes of the energy storage module, g ij1P , g ij2P , g ij3P , g ij4P They represent the original drive signals of the four switch tubes of the energy storage module after passing through the level-boosting logic module, P ij Indicates the level-up enable signal of the energy storage module; g ij2 and P ij is the input of the first OR gate, g ij2P is the output of the first OR gate, g ij1P is the output of the first NOT gate, P ij , g ij1 and g ij3 is the input of the first AND gate, and one input of the second AND gate is g ij3 , the output of the second AND gate is g ij3P , g ij4P is the output of the third NOT gate.
5. The method for controlling the output level of out-of-phase energy storage modules of an energy storage system according to claim 1, characterized in that: The level reduction logic module includes a second OR gate, a fourth NOT gate, a fifth NOT gate, a sixth NOT gate, a third AND gate and a fourth AND gate, the output of the second OR gate is connected to the fourth NOT gate, the output of the third AND gate is connected to the input of the fifth NOT gate, the output of the fifth NOT gate is connected to the input of the fourth AND gate, and the output of the fourth AND gate is connected to the input of the sixth NOT gate.
6. A method for controlling output levels of out-of-phase energy storage modules of an energy storage system according to claim 5, characterized in that: The logical expression of the level reduction logic module is: in, g ij1N , g ij2N , g ij3N , g ij4N They represent the original driving signals of the four switch tubes of the energy storage module after passing through the level reduction logic module, N ij Indicates the level reduction enable signal of the energy storage module; g ij1 and N ij is the input of the second OR gate, and one output of the second OR gate is g ij1N , g ij2N is the output of the fourth NOT gate, N ij , g ij2 and g ij4 is the input of the third AND gate, and one input of the fourth AND gate is g ij4 , the output of the fourth AND gate is g ij4N , g ij3N It is the output of the sixth NOT gate.
7. A method for controlling output levels of out-of-phase energy storage modules of an energy storage system according to claim 1, characterized in that: The method of modifying the original drive signal of the switch tube of any other energy storage module out of phase with the energy storage module by using the level reduction logic module or the level increase logic module according to the type of the energy storage module output level adjustment comprises: When the energy storage module uses the level-raising logic module to adjust the level, any other energy storage module out of phase uses the level-raising logic module to adjust the level; When the energy storage module uses the level reduction logic module to perform level reduction adjustment, any other energy storage module out of phase uses the level reduction logic module to perform level reduction adjustment.
8. A method for controlling output levels of out-of-phase energy storage modules of an energy storage system according to claim 7, characterized in that: When the energy storage module uses the level-raising logic module to perform level-raising adjustment, the condition for any other energy storage module out of phase to use the level-raising logic module to perform level-raising adjustment is: The enable signal corresponding to any energy storage module is a rising level enable signal; Any energy storage module outputs a negative level or a zero level before adjustment.
9. A method for controlling output levels of out-of-phase energy storage modules of an energy storage system according to claim 7, characterized in that: When the energy storage module uses the level reduction logic module to perform level reduction adjustment, the condition for any other energy storage module out of phase to use the level reduction logic module to perform level reduction adjustment is: The enable signal corresponding to any energy storage module is a level-falling enable signal; Any energy storage module outputs a positive level or a zero level before adjustment.
10. An energy storage system out-of-phase energy storage module output level control system, characterized in that: It includes output module, modification module and control module, among which: Output module: used to input the phase sequence and phase number of the energy storage module for output level adjustment, the type of output level adjustment and the output level adjustment enable signal; Modification module: used to modify the original drive signal of the switch tube of the energy storage module using the level-up logic module or the level-down logic module according to the type of output level adjustment of the energy storage module; Control module: used to modify the original drive signal of the switch tube of any other energy storage module that is out of phase with the energy storage module using the level reduction logic module or the level increase logic module according to the type of output level adjustment of the energy storage module and the level adjustment enable signal, so as to offset the output level change of the energy storage module and ensure that the line voltage output level of the high-voltage cascade energy storage system remains unchanged.