Thermal power storage segmented boosting and segmented commutation method and system

Abstract

The invention discloses a thermal power energy storage segmented boosting and segmented conversion method and system, and relates to the technical field of segmented boosting and segmented conversion, and the method comprises the steps: dividing a thermal power energy storage system into two segments, connecting the two segments to a DC bus, and achieving the boosting through a DC transformer; converging the boosted energy storage section to a direct current convergence bus of a boosted voltage level; the energy storage power is adjusted through the high-voltage segmented inversion device, and the frequency of the thermal power generating unit is adjusted; an improved droop control scheme is implemented to control power, and on-off control of the inversion device is realized through electronic components. According to the invention, an improved droop control scheme is adopted in a control system of the high-voltage segmented inversion device, so that the power can be accurately adjusted, and meanwhile, transient fluctuation caused by the voltage of the direct-current bus is avoided. According to the high-voltage segmented inversion device, the loop on-off function of the high-voltage segmented inversion device can be achieved only by controlling on / off of power electronic components in the high-voltage segmented inversion device, a traditional high-voltage large-current circuit breaker is replaced, and the equipment cost is not increased.

Description

Technical Field

[0001] The invention relates to the technical field of segmented boosting and segmented commutation, in particular to a thermal power energy storage segmented boosting and segmented commutation method and system. Background Art

[0002] In the current large-scale thermal power plant power system, the traditional design relies on power frequency transformers for power conversion. This method has exposed many disadvantages when the unit capacity continues to grow. For example, the common power plant system adopts two-stage transformation, which is reduced from 20kV at the generator outlet to 6kV, and then to 400V, and the power frequency transformer is used to process the AC power. As the unit capacity increases, the capacity of the power plant system increases accordingly, resulting in a larger capacity of the high-voltage plant transformer, which in turn causes a sharp increase in the short-circuit current of the power plant system. This change puts higher requirements on the short-circuit breaking capacity of the high-voltage switch. At the same time, in order to meet the short-circuit thermal stability requirements, the high-voltage cable of the power plant system has to choose a thicker specification, which undoubtedly increases the investment cost. Moreover, the traditional power frequency transformer is large in size. The capacity expansion and transformation to expand the capacity of the power plant system is not only expensive and time-consuming, but also affects the normal power generation of the power plant.

[0003] In contrast, the application of DC networking in the plant power system shows significant advantages. DC networking has a larger power supply capacity, does not need to consider phase angle and frequency, can realize asynchronous system interconnection, and the plant load is connected to the DC plant power system through a rectifier, which can improve the efficiency of power conversion, reduce equipment loss, realize load variable frequency drive, simplify the internal circuit of the load, and reduce the failure rate and equipment cost. Based on these advantages, the present invention proposes a thermal power energy storage segmented boost segmented commutation method and system, which aims to solve the problems faced by traditional plant power systems and improve the performance and efficiency of thermal power energy storage systems.

[0004] The present invention relates to a thermal power energy storage segmented boost segmented commutation method and system, specifically to constructing energy storage DC low voltage DC networking, divided into two sections A and B connected to energy storage 976V DC A and B busbars, A and B DC energy storage is boosted from DC 976V to DC 28.28kV by a DC transformer and then converged to the energy storage 28.28kV DC convergence busbar, in order to assist two thermal power units in frequency regulation, innovatively adopts a high-voltage segmented inverter device, and realizes convergence energy storage power absorption / release by controlling the high-voltage segmented inverter device, and the convergence energy storage can assist #1 and #2 thermal power units in frequency regulation alone, or assist #1 and #2 thermal power units in frequency regulation at the same time according to the allocated power. DC boosting is highly efficient, has no power loss, and has simple DC boosting protection and control logic. An improved droop control scheme is adopted in the control system of the high-voltage segmented inverter device, which can achieve accurate power regulation without transient fluctuations in DC bus voltage. By only controlling the on / off of the power electronic components in the high-voltage segmented inverter device, the on / off circuit function of the high-voltage segmented inverter device can be realized, replacing the traditional high-voltage and high-current circuit breaker without increasing the equipment cost. Summary of the invention

[0005] In view of the above-mentioned problems, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is: how to solve the problem that the traditional industrial frequency transformer is large in size, and the capacity expansion and reconstruction for expanding the capacity of the power system of the power plant is not only expensive and time-consuming, but also affects the normal power generation of the power plant.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a thermal power energy storage segmented boost segmented commutation method, comprising: dividing a thermal power energy storage system into two sections and connecting them to a DC bus, and achieving boost through a DC transformer; converging the boosted energy storage sections to a DC bus of the boosted voltage level; adjusting the energy storage power through a high-voltage segmented inverter device to adjust the frequency of the thermal power unit; the energy storage power adjustment includes adopting a high-voltage segmented inverter device, controlling the high-voltage segmented inverter device to achieve converged energy storage power absorption and release, the converged energy storage assists the frequency regulation of the #1 and #2 thermal power units alone, or assists the #1 and #2 thermal power units in frequency regulation at the same time according to the allocated power, controlling the conduction and shutdown of power electronic components in the high-voltage segmented inverter device, and realizing the function of the on-off circuit of the high-voltage segmented inverter device; implementing an improved droop control scheme to control power, and realizing the switch control of the inverter device through electronic components.

[0008] As a preferred solution of the thermal power energy storage segmented boost and segmented commutation method described in the present invention, wherein: the two-section access to the DC bus includes constructing an energy storage DC low-voltage DC network, which is divided into two sections A and B and respectively connected to the energy storage DC A and B bus sections, and boosted by a DC transformer, and after boosting, the boosted current is converged to a DC bus of the boosted voltage level.

[0009] As a preferred solution of the thermal power energy storage segmented boost and segmented commutation method described in the present invention, the DC transformer includes DC boost, the DC boost protection and control logic are simple, the DC transformation uses power electronic components, built-in control algorithm and control strategy, and is scalable.

[0010] As a preferred scheme of the thermal power energy storage segmented boost and segmented commutation method described in the present invention, the droop control scheme controls power, including adopting an active power-DC voltage droop control scheme in the high-voltage segmented inverter control system to achieve power regulation, improve the droop coefficient, introduce a linear function of the DC bus voltage change, and characterize the droop coefficient according to the voltage change rate exponent.

[0011] As a preferred solution of the thermal power energy storage segmented boost segmented commutation method of the present invention, wherein: the realization of power regulation includes adopting an active power-DC voltage droop control scheme in the high-voltage segmented inverter control system to realize power regulation, which is expressed as: , in, The output / absorption power target value of the high-voltage segment inverter device, The current value of the output / absorption power of the high-voltage segmented inverter. is the active power-DC voltage droop coefficient, is the target value of the DC side voltage of the high-voltage segmented inverter device, It is the current value of the DC side voltage of the high-voltage segmented inverter.

[0012] As a preferred solution of the thermal power energy storage segmented boost and segmented commutation method of the present invention, the improvement of the droop coefficient includes introducing a linear function of the DC bus voltage change, characterizing the droop coefficient according to the voltage change rate index, and the adaptive active power-DC voltage droop coefficient is expressed as: , in, is the adaptive active power-DC voltage droop coefficient, The maximum DC bus voltage deviation allowed for the high voltage segment inverter. is the DC bus voltage deviation adjustment exponential coefficient; the adaptive active power-DC voltage droop coefficient is introduced into the active power-DC voltage droop control, which is expressed as: , in, is the adaptive active power-DC voltage droop coefficient.

[0013] Another object of the present invention is to provide a system for a thermal power energy storage segmented boost and segmented commutation method, which can solve the problem of thermal power energy storage segmented boost and segmented commutation by constructing a thermal power energy storage segmented boost and segmented commutation system.

[0014] In order to solve the above technical problems, the present invention provides the following technical solutions: a thermal power energy storage segmented boost segmented commutation system, comprising a thermal power energy storage segmented grid-connected unit, an energy storage segmented DC boost commutation unit and an energy storage distributed DC networking unit; the thermal power generator in the thermal power energy storage segmented grid-connected unit is boosted by a main transformer and connected to the power system, and energy storage grid-connected section A and section B busbars are arranged at the generator outlets of #1 and #2 thermal power units; the AC sides of the A and B sets of high-voltage segmented inverter devices in the energy storage segmented DC boost commutation unit are connected to the A and B sets of energy storage grid-connected switches through the A and B sets of energy storage grid-connected switches. The thermal power energy storage segmented grid-connected unit has high-voltage grid-connected section A and section B busbars, and the energy storage of sections A and B is boosted by A and B sets of energy storage DC transformers and converged to the DC busbar of the boosted voltage level; the distributed energy storage in the energy storage distributed DC networking unit adopts a DC networking form, and the energy storage module is connected to the energy storage DC busbar through a DC-DC converter. The energy storage DC busbar is divided into two sections, A and B, which are respectively connected to the DC side of the low-voltage side converter of A and B sets of energy storage DC transformers through A and B sets of energy storage low-voltage DC circuit breakers in the energy storage segmented DC boost converter unit.

[0015] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the above-mentioned thermal power energy storage segmented boosting and segmented commutation method are implemented.

[0016] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the above-mentioned thermal power energy storage segmented boosting and segmented commutation method.

[0017] The beneficial effects of the present invention are as follows: the thermal power energy storage segmented boost segmented commutation method provided by the present invention innovatively adopts a high-voltage segmented inverter device to assist two thermal power units in frequency regulation. By controlling the high-voltage segmented inverter device, the converged energy storage power absorption / release is realized. The converged energy storage can either assist the frequency regulation of the #1 and #2 thermal power units alone, or assist the frequency regulation of the #1 and #2 thermal power units at the same time according to the allocated power. The use of DC boost is highly efficient and has no power loss. The DC boost protection and control logic are simple. The improved droop control scheme is used in the control system of the high-voltage segmented inverter device, which can achieve precise power regulation without transient fluctuations in the DC bus voltage. It only needs to control the on / off of the power electronic components in the high-voltage segmented inverter device to realize the function of the on-off circuit of the high-voltage segmented inverter device, replacing the traditional high-voltage and high-current circuit breaker without increasing the equipment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0019] Figure 1 A flow chart of a method for segmented boosting and segmented commutation of thermal power energy storage provided in the first embodiment of the present invention.

[0020] Figure 2 This is a structural diagram of a thermal power energy storage segmented boost and segmented commutation system provided in the second embodiment of the present invention.

[0021] In the figure: 100, thermal power energy storage segmented grid-connected unit; 200, energy storage segmented DC boost converter unit; 300, energy storage distributed DC networking unit; 101, generator #1; 102, main transformer #1; 103, 330kV AC bus; 104, energy storage 20kV high-voltage grid-connected bus section A; 105, A set of energy storage AC grid-connected circuit breaker; 106, energy storage 20kV high-voltage grid-connected bus section B; 107, B set of energy storage AC grid-connected circuit breaker; 108, generator #2; 109, main transformer #2; 201, A set of high-voltage segmented inverter device; 202, B set of high-voltage segmented inverter device; 203, energy storage DC high-voltage grid-connected circuit breaker; 204, A set of energy storage power electronic transformer high-voltage side converter; 205, A set of energy storage high-frequency transformer ; 206, A set of energy storage power electronic transformer low voltage side converter; 207, A set of energy storage DC low voltage grid-connected circuit breaker; 208, B set of energy storage power electronic transformer high voltage side converter; 209, B set of energy storage high frequency transformer, 210, B set of energy storage power electronic transformer low voltage side converter; 211, B set of energy storage DC low voltage grid-connected circuit breaker; 301, energy storage 976V DC A section bus; 302, A section energy storage system converter cabinet 1; 303, A section 1# energy storage module; 304, A section energy storage system converter cabinet n; 305, A section n# energy storage module; 306, energy storage 976V DC B section bus; 307, B section energy storage system converter cabinet 1; 308, B section 1# energy storage module; 309, B section energy storage system converter cabinet m; 310, B section m# energy storage module. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Example 1, reference Figure 1 , which is the first embodiment of the present invention, provides a thermal power energy storage segmented boost and segmented commutation method, including: dividing the thermal power energy storage system into two sections and connecting them to a DC bus, and achieving boost through a DC transformer; merging the boosted energy storage sections to a DC bus with a boosted voltage level; adjusting the energy storage power through a high-voltage segmented inverter device to adjust the frequency of the thermal power unit; implementing an improved droop control scheme to control the power, and achieving switch control of the inverter device through electronic components.

[0025] S1. Divide the thermal power storage system into two sections and connect them to the DC bus, and boost the voltage through a DC transformer.

[0026] Construct a low-voltage DC network with energy storage, which is divided into two sections, A and B, and connected to the energy storage DC A and B busbars respectively. The voltage is boosted by a DC transformer and then converged to the DC busbar with the boosted voltage level.

[0027] DC boost is highly efficient and has no power loss. The protection and control logic of DC boost are simple. DC transformer uses power electronic components and can have built-in control algorithms and control strategies to achieve more functions while boosting the voltage, which is scalable.

[0028] S2, merge the boosted energy storage section to the DC busbar of the boosted voltage level.

[0029] S3. The energy storage power is adjusted through the high-voltage segmented inverter to adjust the frequency of the thermal power unit.

[0030] A high-voltage segmented inverter is used to control the high-voltage segmented inverter to achieve power absorption and release of the converged energy storage. The converged energy storage can assist the frequency regulation of the #1 and #2 thermal power units alone, or assist the frequency regulation of the #1 and #2 thermal power units simultaneously according to the allocated power. The power electronic components in the high-voltage segmented inverter are controlled to be turned on and off, thereby achieving the function of the on-off circuit of the high-voltage segmented inverter.

[0031] S4. Implement an improved droop control scheme to control power, and achieve switching control of the inverter device through electronic components.

[0032] An active power-DC voltage droop control scheme is adopted in the control system of the high-voltage segmented inverter to realize power regulation. Furthermore, in order to reduce the DC bus fluctuation during power regulation, the droop coefficient is improved, a linear function of the DC bus voltage change is introduced, and the droop coefficient is characterized according to the voltage change rate exponent, so as to achieve the purpose of adaptively adjusting the droop coefficient according to the voltage change. The proposed improved droop control scheme has the characteristic of not causing transient fluctuation of the DC bus voltage due to power regulation.

[0033] The active power-DC voltage droop control scheme is adopted in the control system of the high-voltage segmented inverter to achieve power regulation: (1) in, The output / absorption power target value of the high-voltage segment inverter device, The current value of the output / absorption power of the high-voltage segmented inverter. is the active power-DC voltage droop coefficient, is the target value of the DC side voltage of the high-voltage segmented inverter device, It is the current value of the DC side voltage of the high-voltage segmented inverter.

[0034] The conventional active power-DC voltage droop coefficient is a constant, which can characterize the linear relationship between active power and DC voltage. Within a certain range, the droop coefficient takes a smaller value, and the high-voltage segmented inverter control system is more accurate in active power regulation, which can speed up the regulation response speed, but will cause deviations in DC voltage regulation and large fluctuations; the larger the droop coefficient, the stronger the voltage deviation suppression capability. When facing the same active power regulation amount, the DC voltage fluctuation is smaller, but it will cause active power overshoot exceeding the regulation limit of the high-voltage segmented inverter.

[0035] In order to reduce the DC bus fluctuation during power regulation, the droop coefficient is improved, a linear function of DC bus voltage change is introduced, and the droop coefficient is characterized according to the voltage change rate exponent. The adaptive active power-DC voltage droop coefficient can be expressed as: (2) in, is the adaptive active power-DC voltage droop coefficient, The maximum DC bus voltage deviation allowed for the high voltage segment inverter. is the DC bus voltage deviation adjustment exponential coefficient. The adaptive active power-DC voltage droop coefficient can achieve the purpose of adaptively adjusting the droop coefficient according to voltage changes, reducing the DC bus voltage deviation during power regulation. Introducing the adaptive active power-DC voltage droop coefficient into the active power-DC voltage droop control can be expressed as: (3) Construct a low-voltage DC network for energy storage, which is divided into two sections, A and B, and connected to the energy storage 976V DC A and B busbars. The DC energy storage in sections A and B is boosted from DC 976V to DC 28.28kV through a DC transformer and then converged to the energy storage 28.28kV DC busbar.

[0036] In order to assist the two thermal power units in frequency regulation, an innovative high-voltage segmented inverter is used. By controlling the high-voltage segmented inverter, the convergent energy storage power absorption / release is realized. The convergent energy storage can either assist the frequency regulation of the #1 and #2 thermal power units individually, or assist the frequency regulation of the #1 and #2 thermal power units at the same time according to the allocated power.

[0037] The use of DC boost is highly efficient, has no power loss, and has simple DC boost protection and control logic. The use of an improved droop control scheme in the control system of the high-voltage segmented inverter device can achieve precise power regulation without causing transient fluctuations in the DC bus voltage.

[0038] By only controlling the on / off of the power electronic components in the high-voltage segmented inverter device, the on / off circuit function of the high-voltage segmented inverter device can be realized, replacing the traditional high-voltage and high-current circuit breaker without increasing the equipment cost.

[0039] Example 2, reference Figure 2 , which is the second embodiment of the present invention, is different from the previous embodiment in that it provides a thermal power energy storage segmented boost segmented commutation system, including: a thermal power energy storage segmented grid-connected unit 100, an energy storage segmented DC boost commutation unit 200 and an energy storage distributed DC networking unit 300.

[0040] The thermal power generator in the thermal power energy storage segmented grid-connected unit 100 is stepped up from 20kV to 330kV through the main transformer and connected to the 330kV power system. At the outlets of the #1 and #2 generators, i.e., the low-voltage side of the main transformer, energy storage 20kV high-voltage grid-connected section A and section B busbars are arranged.

[0041] The AC side of the A and B sets of high-voltage segmented inverter devices in the energy storage segmented DC boost converter unit 200 is connected to the 20kV high-voltage grid-connected A and B sections busbars in the thermal power energy storage segmented grid-connected unit 100 through the A and B sets of energy storage grid-connected switches. The energy storage of sections A and B is boosted from DC 976V to DC 28.28kV through the A and B sets of energy storage DC transformers and then converged to the energy storage 28.28kV DC convergence busbar.

[0042] The distributed energy storage in the energy storage distributed DC networking unit 300 adopts a DC networking form. The energy storage module is connected to the energy storage 976V DC bus through a DC-DC converter. The energy storage 976V DC bus is divided into two sections, A and B, which are respectively connected to the DC side of the low-voltage side converter of the A and B energy storage DC transformers through the A and B sets of energy storage low-voltage DC circuit breakers in the energy storage segmented DC boost converter unit 200.

[0043] like Figure 2 As shown, 101 is the #1 generator, 102 is the #1 main transformer, 103 is the 330kV AC bus, 104 is the energy storage 20kV high-voltage grid-connected A-section bus, 105 is the A-set energy storage AC grid-connected circuit breaker, 106 is the energy storage 20kV high-voltage grid-connected B-section bus, 107 is the B-set energy storage AC grid-connected circuit breaker, 108 is the #2 generator, and 109 is the #2 main transformer.

[0044] 201 is a set of high-voltage segmented inverter device A, 202 is a set of high-voltage segmented inverter device B, 203 is a high-voltage grid-connected circuit breaker for energy storage DC, 204 is a high-voltage side converter of a set of energy storage power electronic transformer A, 205 is a set of energy storage high-frequency transformer A, 206 is a low-voltage side converter of a set of energy storage power electronic transformer A, 207 is a set of low-voltage grid-connected circuit breaker for energy storage DC, 208 is a high-voltage side converter of a set of energy storage power electronic transformer B, 209 is a set of energy storage high-frequency transformer B, 210 is a low-voltage side converter of a set of energy storage power electronic transformer B, and 211 is a set of low-voltage grid-connected circuit breaker for energy storage DC.

[0045] 301 is the energy storage 976V DC section A busbar, 302 is the section A energy storage system converter cabinet 1, 303 is the section A 1# energy storage module, 304 is the section A energy storage system converter cabinet n, 305 is the section A n# energy storage module, 306 is the energy storage 976V DC section B busbar, 307 is the section B energy storage system converter cabinet 1, 308 is the section B 1# energy storage module, 309 is the section B energy storage system converter cabinet m, and 310 is the section B m# energy storage module.

[0046] If the functions are implemented in the form of 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 the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0047] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0048] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0049] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A thermal power energy storage step-up and step-commutation method, characterized in that: include, The thermal power energy storage system is divided into two sections and connected to the DC bus, and the voltage is increased through a DC transformer; The boosted energy storage section is merged to a DC busbar of the boosted voltage level; The energy storage power is adjusted by high-voltage segmented inverters to adjust the frequency of thermal power units; The regulating energy storage power comprises adopting a high-voltage segmented inverter device, and realizing the absorption and release of the converged energy storage power by controlling the high-voltage segmented inverter device, and the converged energy storage assists the frequency modulation of the #1 and #2 thermal power generation units alone, or assists the frequency modulation of the #1 and #2 thermal power generation units at the same time according to the allocated power, and controls the conduction and shutdown of the power electronic components in the high-voltage segmented inverter device, so as to realize the function of the on-off circuit of the high-voltage segmented inverter device; An improved droop control scheme is implemented to control the power, and switching control of the inverter device is achieved through electronic components.

2. The thermal power energy storage segmented boost and segmented commutation method according to claim 1, characterized in that: The two-section access to the DC bus includes constructing an energy storage DC low-voltage DC network, which is divided into two sections, A and B, and respectively connected to the energy storage DC A and B bus sections, and boosted by a DC transformer, and then converged to a DC bus with a boosted voltage level.

3. The thermal power energy storage segmented boost and segmented commutation method according to claim 2, characterized in that: The DC transformer includes a DC boost, the DC boost protection and control logic are simple, the DC transformation uses power electronic components, and has a built-in control algorithm and control strategy, and is scalable.

4. The thermal power energy storage segmented boost and segmented commutation method according to claim 3, characterized in that: The droop control scheme controls power by adopting an active power-DC voltage droop control scheme in a high-voltage segmented inverter control system to achieve power regulation, improve the droop coefficient, introduce a DC bus voltage change linear function, and characterize the droop coefficient according to a voltage change rate exponent.

5. The thermal power energy storage segmented boost and segmented commutation method according to claim 4, characterized in that: The power regulation includes adopting an active power-DC voltage droop control scheme in a high-voltage segmented inverter control system to achieve power regulation, which is expressed as: ， in, The output / absorption power target value of the high-voltage segment inverter device, The current value of the output / absorption power of the high-voltage segmented inverter. is the active power-DC voltage droop coefficient, is the target value of the DC side voltage of the high-voltage segmented inverter device, It is the current value of the DC side voltage of the high-voltage segmented inverter.

6. The thermal power energy storage segmented boost and segmented commutation method according to claim 5, characterized in that: The improvement of the droop coefficient includes introducing a linear function of the DC bus voltage change, characterizing the droop coefficient according to the voltage change rate index, and expressing the adaptive active power-DC voltage droop coefficient as follows: ， in, is the adaptive active power-DC voltage droop coefficient, The maximum DC bus voltage deviation allowed for the high voltage segment inverter. is the DC bus voltage deviation adjustment exponential coefficient; The adaptive active power-DC voltage droop coefficient is introduced into the active power-DC voltage droop control, which is expressed as: ， in, is the adaptive active power-DC voltage droop coefficient.

7. A system using the thermal power energy storage segmented boost and segmented commutation method according to any one of claims 1 to 6, characterized in that: It comprises a thermal power energy storage segmented grid-connected unit (100), an energy storage segmented DC boost converter unit (200) and an energy storage distributed DC networking unit (300); The thermal power generator in the thermal power energy storage segmented grid-connected unit (100) is stepped up by a main transformer and connected to the power system. Energy storage grid-connected busbars A and B are arranged at the generator outlets of the #1 and #2 thermal power units. The AC sides of the A and B sets of high-voltage segmented inverter devices in the energy storage segmented DC boost converter unit (200) are connected to the A and B sets of high-voltage grid-connected busbars in the thermal power energy storage segmented grid-connected unit (100) through the A and B sets of energy storage grid-connected switches. The energy stored in the A and B sections is boosted through the A and B sets of energy storage DC transformers and converged to the DC busbar of the boosted voltage level. The distributed energy storage in the energy storage distributed DC networking unit (300) adopts a DC networking form, the energy storage module is connected to the energy storage DC busbar through a DC-DC converter, the energy storage DC busbar is divided into two sections, A and B, which are respectively connected to the DC side of the low-voltage side converters of the A and B energy storage DC transformers through the A and B sets of energy storage low-voltage DC circuit breakers in the energy storage segmented DC boost converter unit (200).

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the thermal power energy storage segmented boost and segmented commutation method described in any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the thermal power energy storage segmented boost and segmented commutation method described in any one of claims 1 to 6 are implemented.

Images