A method and system for accessing a power electronic energy storage transformer distribution converter
By using the distributed converter access method of thermal power energy storage electronic transformer, and utilizing power electronic transformers and improved droop control scheme, the problems of large equipment size and high retrofit cost in traditional thermal power plant power systems have been solved. Stable operation and efficient power regulation of plant photovoltaic inverters have been achieved, improving the system's operating efficiency and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XIAN THERMAL POWER RES INST CO LTD
- Filing Date
- 2025-03-06
- Publication Date
- 2026-07-03
AI Technical Summary
In traditional thermal power plant power systems, as the unit capacity increases, the capacity of the power plant transformer also increases, leading to an increase in short-circuit current, which increases investment costs and equipment size. Furthermore, the cost of retrofitting traditional power frequency transformers is high, making it difficult to achieve stable operation of the plant photovoltaic inverter under power imbalance conditions.
The thermal power energy storage electronic transformer distributed converter access method is adopted. By constructing a thermal power energy storage combined power electronic transformer distributed converter access system, an improved droop control scheme is adopted, voltage compensation and current compensation modules are introduced, and the power electronic transformer is used to centrally step up the voltage and then connect to the thermal power unit through a segmented high-voltage converter device to achieve the consistency of DC bus voltage and the proportional regulation of current.
Reduce equipment footprint, improve power regulation accuracy, enable stable operation of plant photovoltaic inverters under power imbalance conditions, reduce equipment costs, and improve system operating efficiency and stability.
Smart Images
Figure CN120185059B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of energy storage and current convergence technology, and in particular to a method and system for connecting thermal power energy storage electronic transformers to distributed converters. Background Technology
[0002] Currently, the typical design of power supply systems for large thermal power units involves step-down transformers connected to the generator outlet, which can be divided into two stages: one stage steps down the 20kV generator outlet voltage to 6kV, and the other stage steps down the 6kV voltage to 400V. Both stages use power frequency transformers and involve alternating current. As the unit capacity continues to increase, the capacity of the power supply system also increases. With larger transformers, the short-circuit current in the power supply system becomes very large, placing higher demands on the short-circuit breaking capacity of the high-voltage switches. To meet the requirements for short-circuit thermal stability, thicker cables are needed for the high-voltage cables in the power supply system, increasing investment costs. Traditional high-voltage transformers use power frequency transformers, which are bulky. Furthermore, to achieve a larger power supply system capacity, capacity expansion is often required, resulting in huge costs, long construction periods, and delays in normal power generation.
[0003] Adopting DC grid networking in plant power systems can effectively solve some bottleneck problems in the development of traditional AC plant power systems. Compared with traditional AC plant power systems, DC grid networking has many advantages: DC grids have a larger power supply capacity; DC grids do not need to consider phase angle and frequency, and can realize asynchronous system interconnection; plant loads are connected to the DC plant power system through rectifiers, which can improve power conversion efficiency and reduce equipment losses, realize load frequency conversion drive, simplify the internal circuit of the load, and reduce failure rate and equipment cost. Summary of the Invention
[0004] In view of the above-mentioned problems, the present invention is proposed.
[0005] Therefore, the technical problem solved by this invention is: how to achieve stable operation of plant photovoltaic inverters under power imbalance conditions, and solve the problem of excessive distortion rate of inverter output current caused by input power imbalance in plant photovoltaics.
[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for accessing distributed converters via electronic transformers for thermal power storage, comprising: constructing a distributed converter access system for thermal power storage combined power electronic transformers; adopting an improved droop control scheme to ensure the consistency of the DC bus voltage; introducing a voltage compensation module and a current compensation module to correct the droop curve coefficient, so that the output current of the two sets of segmented high-voltage converter devices can be proportionally adjusted.
[0007] As a preferred embodiment of the thermal power energy storage electronic transformer distributed converter access method described in this invention, the thermal power energy storage busbar power electronic transformer distributed converter access system connects to the generator outlets of two thermal power units after centralized voltage boosting via a power electronic transformer and then through segmented high-voltage converter devices. One section of busbar energy storage is connected to two sets of segmented high-voltage converter devices. When assisting one thermal power unit in frequency regulation, one set of high-voltage converter devices in the connected segment is turned on, while the other set is locked. When assisting two thermal power units in frequency regulation, power is allocated according to the frequency regulation command, and power regulation is performed by controlling the segmented high-voltage converter devices, while simultaneously receiving SOC status information of the energy storage equipment.
[0008] As a preferred embodiment of the distributed converter access method for thermal power energy storage electronic transformers described in this invention, the droop control scheme, i.e., DC voltage-current droop control, is expressed as follows:
[0009] ,
[0010] in, This is the reference value for the DC-side bus voltage of the segmented high-voltage converter unit. Let be the actual value of the DC-side bus voltage of the i-th high-voltage converter unit. I is the DC voltage-current droop factor. i The output current of the i-th segmented high-voltage converter unit.
[0011] As a preferred embodiment of the distributed converter access method for thermal power energy storage electronic transformers according to the present invention, the voltage compensation module and the current compensation module are represented as follows:
[0012] ,
[0013] in, For voltage compensation module, This is a current compensation module, where 'a' is the voltage compensation coefficient. To adjust the total duration, Let be the output voltage of the i-th segmented high-voltage converter at time t. Let be the output voltage of the i-th segmented high-voltage converter at time t-1. This is a current compensation module, where b is the current compensation coefficient. Let t be the output current of the i-th segmented high-voltage converter at time t; Let t-1 be the output current of the i-th segmented high-voltage converter.
[0014] As a preferred embodiment of the distributed converter access method for thermal power energy storage electronic transformers described in this invention, wherein: combining the above formula, a DC voltage-current droop control containing a voltage compensation module and a module current compensation module can be obtained, expressed as:
[0015] .
[0016] Secondly, another objective of this invention is to provide a distributed converter access system for thermal power energy storage electronic transformers, comprising: a thermal power energy storage segmented converter access unit, an energy storage busbar power electronic boost unit, and an energy storage segmented boost unit; the thermal power energy storage segmented converter access unit is used to connect the generator of the thermal power unit to the power grid through a segmented high-voltage converter device, realizing flexible frequency regulation control of energy storage and the thermal power unit; the energy storage busbar power electronic boost unit is used to centrally boost and filter the voltage through a power electronic transformer, connecting the energy storage device to the segmented high-voltage converter device to provide a stable high-voltage power supply for the system; the energy storage segmented boost unit is used to combine the low-voltage power of the energy storage module to the energy storage busbar after conversion and boosting, providing energy support for the input of the power electronic transformer.
[0017] As a preferred embodiment of the thermal power energy storage electronic transformer distributed converter access system of the present invention, the thermal power energy storage segmented converter access unit includes a No. 1 generator, a No. 1 main transformer, a 330kV power grid system, a first photovoltaic inverter, a first photovoltaic grid-connected switch, a second photovoltaic inverter, a second photovoltaic grid-connected switch, a No. 2 generator, and a No. 2 main transformer.
[0018] The No. 1 generator is connected to the 330kV power grid system through the No. 1 main transformer, and the No. 2 generator is connected to the 330kV power grid system through the No. 2 main transformer, so as to realize the output and grid connection of electrical energy; the first photovoltaic inverter is connected to the 200V energy storage bus through the first photovoltaic grid connection switch, and the second photovoltaic inverter is connected to the 200V energy storage bus through the second photovoltaic grid connection switch.
[0019] As a preferred embodiment of the thermal power energy storage electronic transformer distributed converter access system of the present invention, the energy storage segmented step-up access unit includes a 6kV energy storage bus, a No. 1 energy storage transformer, a No. 1 energy storage system converter cabinet, a No. 1 energy storage module, an nth energy storage transformer, an nth energy storage system converter cabinet, and an nth energy storage module.
[0020] The 6kV energy storage busbar is connected to the AC side of the low-voltage converter device of the power electronic transformer in the energy storage busbar power electronic step-up unit; the No. 1 energy storage module and the No. n energy storage module are connected to the 6kV energy storage busbar through the No. 1 energy storage system converter cabinet, the No. n energy storage system converter cabinet and the No. 1 energy storage transformer and the No. n energy storage module.
[0021] Thirdly, a computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the distributed converter access method for thermal power storage electronic transformers as described above.
[0022] Fourthly, a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the distributed converter access method for thermal power energy storage electronic transformers as described above.
[0023] The beneficial effects of this invention are as follows: The distributed converter access method and system for thermal power energy storage using electronic transformers of this invention connects to the generator outlets of two thermal power units after centralized voltage boosting via a power electronic transformer and then through a segmented high-voltage converter device. The use of a power electronic transformer saves equipment space and provides flexible control. Centralized energy storage can achieve frequency regulation of two thermal power units through two segmented high-voltage converter devices. Only the power regulation of the segmented high-voltage converter devices needs to be controlled, which increases the power regulation accuracy and ensures that the energy storage can optimize power output according to frequency commands. It can realize global frequency regulation and proportional distribution of active power of the segmented high-voltage converter devices. Attached Figure Description
[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 This is an overall flowchart of a distributed converter access method for thermal power energy storage electronic transformers provided in one embodiment of the present invention;
[0026] Figure 2 This is a schematic diagram of a distributed converter access system for thermal power energy storage electronic transformers provided in one embodiment of the present invention. Detailed Implementation
[0027] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0028] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.
[0029] Example 1
[0030] Reference Figure 1 As an embodiment of the present invention, a method for distributed converter access of thermal power energy storage electronic transformers is provided, comprising:
[0031] S1: Construct a distributed converter access system for thermal power energy storage and power electronic transformers;
[0032] Furthermore, the thermal power energy storage combined power electronic transformer distributed converter access system connects to the generator outlets of two thermal power units after centralized voltage boosting via a power electronic transformer and then passing through segmented high-voltage converter devices. One section of combined energy storage passes through two sets of segmented high-voltage converter devices. When assisting one thermal power unit in frequency regulation, one set of high-voltage converter devices in the connected segment is turned on, while the other set is locked. When assisting the two thermal power units in frequency regulation, power is allocated according to the frequency regulation command, and power regulation is performed by controlling the segmented high-voltage converter devices, while simultaneously receiving SOC status information from the energy storage devices.
[0033] S2: An improved droop control scheme is adopted to ensure the consistency of DC bus voltage;
[0034] Furthermore, the droop control scheme, namely DC voltage-current droop control, can be expressed as:
[0035] ,
[0036] in, This is the reference value for the DC-side bus voltage of the segmented high-voltage converter unit. Let be the actual value of the DC-side bus voltage of the i-th high-voltage converter unit. I is the DC voltage-current droop factor. i The output current of the i-th segmented high-voltage converter unit.
[0037] S3: Introduce voltage compensation module and current compensation module to correct the droop curve coefficient, so that the output current of the two sets of segmented high-voltage converter devices can be adjusted proportionally.
[0038] Furthermore, the voltage compensation module and the current compensation module are represented as follows:
[0039] ,
[0040] in, For voltage compensation module, This is a current compensation module, where 'a' is the voltage compensation coefficient. To adjust the total duration, Let be the output voltage of the i-th segmented high-voltage converter at time t. Let be the output voltage of the i-th segmented high-voltage converter at time t-1. This is a current compensation module, where b is the current compensation coefficient. Let t be the output current of the i-th segmented high-voltage converter at time t; Let t-1 be the output current of the i-th segmented high-voltage converter.
[0041] Combining the above formulas, the DC voltage-current droop control containing a voltage compensation module and a module current compensation module can be obtained, expressed as:
[0042] .
[0043] In the field of energy storage and current convergence technology, traditional large-scale thermal power unit auxiliary power systems mostly use power frequency transformers for two-stage voltage transformation: stepping down from 20kV at the generator outlet to 6kV, and then from 6kV to 400V. In this traditional model, as the unit capacity increases, the capacity of the auxiliary power system also increases, leading to a larger high-voltage transformer capacity and consequently, a large short-circuit current in the auxiliary power system. This places higher demands on the short-circuit breaking capacity of the high-voltage switches. Simultaneously, to meet short-circuit thermal stability requirements, the high-voltage cables of the auxiliary power system need to be of thicker specifications, significantly increasing investment costs. Moreover, the traditional power frequency transformers used in high-voltage transformers are enormous; upgrading them is not only expensive but also time-consuming, potentially disrupting normal power generation.
[0044] In comparison, the thermal power energy storage electronic transformer distributed converter access method and system of the present invention have significant advantages. This method constructs a thermal power energy storage combiner power electronic transformer distributed converter access system, which uses a power electronic transformer for centralized voltage boosting followed by segmented high-voltage converter devices to connect to the generator outlets of two thermal power units. In this approach, the power electronic transformer offers more flexible control compared to traditional power frequency transformers and saves equipment space.
[0045] In terms of power regulation, traditional methods struggle to achieve precise frequency regulation of two thermal power units using a single energy storage system. This invention utilizes centralized combined energy storage with two segmented high-voltage converters to assist in frequency regulation of two thermal power units. When assisting in frequency regulation of one thermal power unit, one set of high-voltage converters in the connected segment is activated, while the other is locked. When assisting in frequency regulation of both thermal power units, power is allocated according to the frequency regulation command, and power regulation is achieved by controlling the segmented high-voltage converters. Simultaneously, the system can receive SOC (State of Charge) status information from the energy storage equipment. This significantly increases power regulation accuracy, ensuring that the energy storage can optimize power output according to frequency commands. It achieves global frequency regulation and proportional distribution of active power across the segmented high-voltage converters, effectively improving system operating efficiency and stability.
[0046] Traditional methods for addressing issues related to industrial photovoltaic (PV) inverters struggle to effectively control the inverter's output current distortion rate when faced with unbalanced input power. This invention employs an improved droop control scheme to ensure consistent DC-side bus voltage and introduces voltage and current compensation modules to correct the droop curve coefficient. This allows for proportional adjustment of the output current of the two segmented high-voltage converter units, thereby enabling stable operation of the industrial PV inverter under power imbalance conditions. This solves the problem of excessive output current distortion caused by unbalanced input power in industrial PV inverters.
[0047] Example 2
[0048] Reference Figure 2 According to one embodiment of the present invention, a distributed converter access system for thermal power energy storage electronic transformer is provided, comprising: thermal power energy storage segmented converter access unit 1, energy storage combiner power electronic boost unit 2, and energy storage segmented boost access unit 3;
[0049] The thermal power energy storage segmented converter access unit 1 is used to connect the generator of the thermal power unit to the power grid through the segmented high-voltage converter device, so as to realize flexible frequency regulation control of energy storage and thermal power unit.
[0050] The energy storage combiner power electronic step-up unit 2 is used to centrally step up and filter the voltage through a power electronic transformer, and connect the energy storage device to the segmented high-voltage converter device to provide a stable high-voltage power supply for the system.
[0051] The energy storage segmented step-up access unit 3 is used to convert and step up the low-voltage power of the energy storage module and then connect it to the energy storage bus to provide energy support for the input of the power electronic transformer.
[0052] The thermal power energy storage segmented converter access unit 1 includes generator 1-1, main transformer 1-2, 330kV power grid system 1-3, first photovoltaic inverter 1-4, first photovoltaic grid-connected switch 1-5, second photovoltaic inverter 1-6, second photovoltaic grid-connected switch 1-7, generator 2-8, and main transformer 2-9.
[0053] Generator 1-1 is connected to the 330kV power grid system through main transformer 1-2, and generator 2-8 is connected to the 330kV power grid system through main transformer 2-9, realizing the output and grid connection of electrical energy; the first photovoltaic inverter 1-4 is connected to the 200V energy storage bus through the first photovoltaic grid connection switch 1-5, and the second photovoltaic inverter 1-6 is connected to the 200V energy storage bus through the second photovoltaic grid connection switch 1-7.
[0054] The energy storage segmented step-up access unit 3 includes a 6kV energy storage bus 3-1, energy storage transformer 1 3-3, energy storage system converter cabinet 1 3-4, energy storage module 1 3-5, energy storage transformer n 3-7, energy storage system converter cabinet n 3-8, and energy storage module n 3-9.
[0055] The 6kV energy storage bus 3-1 is connected to the AC side of the low-voltage converter device of the power electronic transformer in the energy storage combiner power electronic step-up unit 2; the No. 1 energy storage module 3-5 and the nth energy storage module 3-9 are combined to the 6kV energy storage bus through the No. 1 energy storage system converter cabinet 3-4, the nth energy storage system converter cabinet 3-8, the No. 1 energy storage transformer 3-3, and the nth energy storage module 3-9.
[0056] The thermal power energy storage segmented converter access unit 1 connects the generator of the thermal power unit to the power grid through a segmented high-voltage converter device, realizing flexible frequency regulation control between energy storage and the thermal power unit. This connection method enables the energy storage system to respond quickly to changes in grid frequency and flexibly adjust the charging and discharging state of the energy storage according to different frequency regulation commands, providing stable frequency support for the thermal power unit. Compared with the traditional single connection method, it breaks the fixed connection pattern, improves the collaborative working capability between the energy storage system and the thermal power unit, enhances the ability of the entire power system to cope with frequency fluctuations, and ensures the stable operation of the power grid.
[0057] The energy storage combiner power electronic step-up unit 2 centrally steps up and filters the voltage using a power electronic transformer, connecting the energy storage device to the segmented high-voltage converter to provide a stable high-voltage power supply to the system. On one hand, compared to traditional transformers, the use of power electronic transformers allows for more precise control of voltage rise and fall, improving energy conversion efficiency and reducing energy loss during transmission. On the other hand, the filtering function effectively removes harmonics and other interference from the power system, providing a cleaner and more stable power supply for subsequent equipment. This improves the operational reliability and lifespan of electrical equipment throughout the system and reduces the risk of equipment failure caused by voltage fluctuations and harmonic interference.
[0058] The energy storage segmented step-up access unit 3 converts and boosts the low-voltage power of the energy storage modules before feeding it into the energy storage bus, providing energy support for the input of the power electronic transformer. This structural design optimizes the energy transmission path of the energy storage system and improves its overall efficiency. Through the conversion and step-up process, the electrical energy of the low-voltage energy storage modules can be efficiently integrated and transmitted to the energy storage bus, meeting the input voltage and power requirements of the power electronic transformer. This ensures that the energy storage system can stably provide energy replenishment to the power system under different operating conditions, enhancing the emergency response capability and power supply reliability of the power system.
[0059] Example 3
[0060] One embodiment of the present invention differs from the previous two embodiments in that:
[0061] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0062] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-including system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.
[0063] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.
[0064] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.
[0065] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A method for accessing a power electronic energy storage transformer distribution converter, characterized in that, include: Construct a distributed converter access system for thermal power energy storage and power electronic transformers; An improved droop control scheme is adopted to ensure the consistency of DC-side bus voltage; By introducing voltage compensation modules and current compensation modules, the droop curve coefficient is corrected, so that the output current of the two sets of segmented high-voltage converters can be proportionally adjusted. The droop control scheme, namely DC voltage-current droop control, is expressed as follows: wherein, is a DC side bus voltage reference value of the segmented high-voltage converter device, is an actual value of the DC side bus voltage of the i-th high-voltage converter device, is a DC voltage-current droop coefficient, I i is an output current of the i-th segmented high-voltage converter device; The voltage compensation module and the current compensation module are represented as follows: in, For voltage compensation module, This is a current compensation module, where 'a' is the voltage compensation coefficient. To adjust the total duration, Let be the output voltage of the i-th segmented high-voltage converter at time t. Let be the output voltage of the i-th segmented high-voltage converter at time t-1. This is a current compensation module, where b is the current compensation coefficient. Let be the output current of the i-th segmented high-voltage converter at time t; Let t-1 be the output current of the i-th segmented high-voltage converter unit; Combining the above formulas, the DC voltage-current droop control containing a voltage compensation module and a module current compensation module can be obtained, expressed as: The thermal power energy storage combined power electronic transformer distributed converter access system connects to the generator outlets of two thermal power units after centralized voltage boosting via a power electronic transformer and then through segmented high-voltage converter devices. One section of combined energy storage is connected to two sets of segmented high-voltage converter devices. When assisting one thermal power unit in frequency regulation, one set of high-voltage converter devices in the connected segment is turned on, while the other set is locked. When assisting two thermal power units in frequency regulation, power is allocated according to the frequency regulation command, and power regulation is performed by controlling the segmented high-voltage converter devices, while simultaneously receiving SOC status information from the energy storage devices.
2. A system using the method of claim 1, characterized in that, include: Thermal power energy storage segmented converter access unit (1), energy storage combiner power electronic boost unit (2) and energy storage segmented boost access unit (3); The thermal power energy storage segmented converter access unit (1) is used to connect the generator of the thermal power unit to the power grid through the segmented high voltage converter device, so as to realize flexible frequency regulation control of energy storage and thermal power unit; The energy storage combiner power electronic boost unit (2) is used to centrally boost and filter the voltage through the power electronic transformer, connect the energy storage device to the segmented high voltage converter, and provide a stable high voltage power supply for the system. The energy storage segmented step-up access unit (3) is used to convert and step up the low-voltage power of the energy storage module and then connect it to the energy storage bus to provide energy support for the input of the power electronic transformer. The thermal power energy storage segmented converter access unit (1) includes generator No. 1 (1-1), main transformer No. 1 (1-2), 330kV power grid system (1-3), first photovoltaic inverter (1-4), first photovoltaic grid-connected switch (1-5), second photovoltaic inverter (1-6), second photovoltaic grid-connected switch (1-7), generator No. 2 (1-8), and main transformer No. 2 (1-9). Generator No. 1 (1-1) is connected to the 330kV power grid system through main transformer No. 1 (1-2), and generator No. 2 (1-8) is connected to the 330kV power grid system through main transformer No. 2 (1-9) to realize power output and grid connection; the first photovoltaic inverter (1-4) is connected to the 200V energy storage bus through the first photovoltaic grid connection switch (1-5), and the second photovoltaic inverter (1-6) is connected to the 200V energy storage bus through the second photovoltaic grid connection switch (1-7); The energy storage segmented voltage boosting access unit (3) includes a 6kV energy storage bus (3-1), energy storage transformer No. 1 (3-3), energy storage system converter cabinet No. 1 (3-4), energy storage module No. 1 (3-5), energy storage transformer No. n (3-7), energy storage system converter cabinet No. n (3-8), and energy storage module No. n (3-9). The 6kV energy storage bus (3-1) is connected to the AC side of the low-voltage converter device of the power electronic transformer in the energy storage power electronic step-up unit (2); the No. 1 energy storage module (3-5) and the nth energy storage module (3-9) are connected to the 6kV energy storage bus through the No. 1 energy storage system converter cabinet (3-4), the nth energy storage system converter cabinet (3-8), the No. 1 energy storage transformer (3-3), and the nth energy storage module (3-9).
3. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the distributed converter access method for thermal power energy storage electronic transformers as described in claim 1.
4. A computer-readable storage medium having stored thereon a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the distributed converter access method for thermal power energy storage electronic transformers as described in claim 1.