High-voltage cascade power compensation circuit, method, device, medium and equipment

Abstract

The invention relates to a high-voltage cascade power compensation circuit, method, device, medium and equipment, and the circuit comprises a three-phase high-voltage cascade converter connected with a three-phase power grid, and each phase of the three-phase high-voltage cascade converter comprises a plurality of cascade units which are connected in series. And the cascade unit is connected in series with a battery energy storage unit and a super capacitor unit which are connected in parallel. On the basis of a traditional high-voltage cascade topology, a supercapacitor is connected in parallel to a direct-current bus of a cascade unit through DC-DC, better transient performance is generated through the combination of a battery energy storage unit and the supercapacitor, the service life of the battery energy storage unit is prolonged, the compact size of an ESS (Energy Storage System) is improved, reactive power and active power support can be provided for a power grid, and the energy storage efficiency is improved. The system has the functions of assisting primary frequency modulation of a power grid and providing inertia, and can temporarily replace standard STATCOM voltage support at the same time.

Description

Technical Field

[0001] The present disclosure relates to the field of power electronics technology, and in particular to a high-voltage cascade power compensation circuit, method, device, medium and equipment. Background Art

[0002] As the proportion of photovoltaic and wind power in the energy system continues to increase, the inherent volatility, randomness and intermittency of renewable energy are increasingly challenging the stable operation of the power system. Large-capacity energy storage devices and reactive power compensation devices can achieve the functions of grid frequency adjustment, grid voltage and inertia support, which is critical to improving the reliability of the power system.

[0003] However, connecting supercapacitors via DC-DC to the high-voltage DC bus is suitable for HVDC (High Voltage Direct Current) transmission scenarios, but cannot be implemented on traditional AC power grids; the use of unit bus capacitors to achieve active / reactive power compensation has limited effect, and due to the limitation of battery voltage, active / reactive power compensation cannot be performed by charging and discharging capacitors. Summary of the invention

[0004] The purpose of the present disclosure is to provide a high-voltage cascade power compensation circuit, method, device, medium and equipment. Based on the traditional high-voltage cascade topology, a supercapacitor is connected in parallel to the DC bus of the cascade unit through a DC-DC. The combination of a battery energy storage unit and a supercapacitor produces better transient performance, improves the life of the battery energy storage unit and the compact size of the ESS (Energy Storage System), can provide reactive and active power support for the power grid, has the function of assisting the primary frequency regulation of the power grid and providing inertia, and can temporarily replace the standard STATCOM (static synchronous compensator) voltage support.

[0005] In order to achieve the above object, according to a first aspect of an embodiment of the present disclosure, a high-voltage cascade power compensation circuit is provided, the circuit comprising:

[0006] A three-phase high-voltage cascade converter connected to a three-phase power grid, wherein each phase of the three-phase high-voltage cascade converter comprises a plurality of cascade units connected in series, wherein the cascade units are connected in series with battery energy storage units and supercapacitor units connected in parallel with each other.

[0007] Optionally, the supercapacitor unit comprises:

[0008] DCDC converter and supercapacitor energy storage module connected in series.

[0009] Optionally, the cascade unit includes a single-phase H-bridge inverter.

[0010] According to a second aspect of an embodiment of the present disclosure, a method for determining parameters of a high-voltage cascade power compensation circuit is provided, wherein the high-voltage cascade power compensation circuit comprises: a three-phase high-voltage cascade converter connected to a three-phase power grid, wherein each phase of the three-phase high-voltage cascade converter comprises a plurality of cascade units connected in series, wherein the cascade units are connected in series with battery energy storage units and supercapacitor units connected in parallel with each other; the method comprises:

[0011] Determining the DC side voltage of the cascade unit according to the grid voltage level of the three-phase grid and the number of cascade units;

[0012] The active power and reactive power that the cascade unit needs to process are determined according to the DC side voltage of the cascade unit.

[0013] Optionally, the method further comprises:

[0014] The power capacity of the battery energy storage unit is determined according to the DC side voltage.

[0015] Optionally, the method further comprises:

[0016] Determine the active power that needs to be output by the supercapacitor energy storage module in the supercapacitor unit according to the active power that needs to be processed by the cascade unit and the power capacity of the battery energy storage unit;

[0017] The capacitor capacity of the supercapacitor energy storage module is determined according to the active power that the supercapacitor energy storage module needs to output.

[0018] Optionally, the method comprises:

[0019] Determining the voltage fluctuation range of the supercapacitor energy storage module according to the DC side voltage and device parameters of the cascade unit;

[0020] Determine the reactive power that the supercapacitor energy storage module needs to output according to the active power that the cascade unit needs to process and the power capacity of the battery energy storage unit;

[0021] The capacitor capacity of the supercapacitor energy storage module is determined according to the voltage fluctuation range of the supercapacitor energy storage module and the reactive power that the supercapacitor energy storage module needs to output.

[0022] According to a third aspect of an embodiment of the present disclosure, a high-voltage cascade power compensation circuit parameter determination device is provided, wherein the high-voltage cascade power compensation circuit comprises: a three-phase high-voltage cascade converter connected to a three-phase power grid, wherein each phase of the three-phase high-voltage cascade converter comprises a plurality of cascade units connected in series, wherein the cascade units are connected in series with battery energy storage units and supercapacitor units connected in parallel with each other; the device comprises:

[0023] A first determination module, used to determine the DC side voltage of the cascade unit according to the grid voltage level of the three-phase grid and the number of cascade units;

[0024] The second determination module is used to determine the active power and reactive power that the cascade unit needs to process according to the DC side voltage of the cascade unit.

[0025] According to a fourth aspect of an embodiment of the present disclosure, there is provided a non-temporary computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the steps of any one of the methods described in the second aspect are implemented.

[0026] According to a fifth aspect of an embodiment of the present disclosure, there is provided an electronic device, including:

[0027] a memory having a computer program stored thereon;

[0028] A processor is used to execute the computer program in the memory to implement the steps of any one of the methods in the second aspect.

[0029] In summary, the embodiment of the present disclosure provides a high-voltage cascade power compensation circuit, the circuit comprising: a three-phase high-voltage cascade converter connected to a three-phase power grid, each phase of the three-phase high-voltage cascade converter comprising a plurality of cascade units connected in series, the cascade units being connected in series with battery energy storage units and supercapacitor units connected in parallel with each other. Based on the traditional high-voltage cascade topology, a supercapacitor is connected in parallel to the DC bus of the cascade unit through a DC-DC, and the combination of the battery energy storage unit and the supercapacitor produces better transient performance, improves the life of the battery energy storage unit and the compact size of the ESS (Energy Storage System), can provide reactive and active power support for the power grid, has the function of assisting the primary frequency modulation of the power grid and providing inertia, and can temporarily replace the standard STATCOM voltage support.

[0030] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0032] Figure 1a The diagram is a topology diagram of a high-voltage cascade power compensation circuit according to an exemplary embodiment.

[0033] Figure 1b is a schematic diagram of a circuit topology of a cascade unit according to an exemplary embodiment.

[0034] Figure 2 The present invention is a flow chart of a method for determining parameters of a high-voltage cascade power compensation circuit according to an exemplary embodiment.

[0035] Figure 3 The present invention is a flow chart of a method for determining parameters of a high-voltage cascade power compensation circuit according to an exemplary embodiment.

[0036] Figure 4 The present invention is a flow chart of a method for determining parameters of a high-voltage cascade power compensation circuit according to an exemplary embodiment.

[0037] Figure 5 The present invention is a flow chart of a method for determining parameters of a high-voltage cascade power compensation circuit according to an exemplary embodiment.

[0038] Figure 6 It is a block diagram of a high-voltage cascade power compensation circuit parameter determination device 600 according to an exemplary embodiment.

[0039] Figure 7 is a block diagram of an electronic device 700 according to an exemplary embodiment. DETAILED DESCRIPTION

[0040] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0041] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0042] It should be understood that the various steps described in the method embodiments of the present disclosure may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present disclosure is not limited in this respect.

[0043] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0044] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0045] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise clearly indicated in the context, they should be understood as "one or more". In the description of the present disclosure, unless otherwise specified, "multiple" refers to two or more than two, and other quantifiers are similar; "at least one item", "one or more items" or similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one item a can represent any number of a; for another example, one or more items of a, b and c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple; "and / or" is a kind of association relationship that describes the associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural.

[0046] Although operations or steps are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood that it is required to perform these operations or steps in the specific order shown or in a serial order, or to perform all the operations or steps shown to obtain the desired results. In the embodiments of the present disclosure, these operations or steps can be performed in series; these operations or steps can also be performed in parallel; or some of these operations or steps can be performed.

[0047] At the same time, it is understood that the data involved in this technical solution (including but not limited to the data itself, the acquisition or use of the data) should comply with the requirements of the corresponding laws and regulations and relevant provisions. The present disclosure is described below in conjunction with specific embodiments.

[0048] The main purpose of the present disclosure is to realize a circuit topology that can quickly provide active and reactive power compensation for the power grid, and it is expected that the number of charge and discharge switching of the battery energy storage unit can be reduced during operation. Compared with the existing scheme, the present scheme connects the supercapacitor in parallel to the busbar of the cascade unit through DC-DC, and the voltage of the supercapacitor can fluctuate in a larger range to achieve a larger range of active / reactive power compensation.

[0049] Figure 1a FIG. 1 is a schematic diagram showing a topology of a high voltage cascade power compensation circuit according to an exemplary embodiment. Figure 1aAs shown, an embodiment of the present disclosure provides a high-voltage cascade power compensation circuit, the circuit comprising:

[0050] A three-phase high-voltage cascade converter connected to a three-phase power grid, each phase of the three-phase high-voltage cascade converter includes a plurality of cascade units 10 connected in series, and the cascade units 10 are connected in series with battery energy storage units 20 and super capacitor units 30 connected in parallel. Among them, each level of the cascade unit 10 inverts the DC voltage into an AC voltage, and after the multiple levels of cascade units 10 are connected in series, a level requirement of a single-phase AC voltage that meets the three-phase power grid can be generated. For example, if the single-phase AC voltage of the three-phase power grid is AC300V, and the output voltage of the cascade unit 10 of each level is AC100V, then the single-phase voltage of the three-phase power grid can be obtained after the three-level cascade units 10 are connected in series. The parallel battery energy storage unit 20 and super capacitor unit 30 are used to provide DC voltage / current support for the cascade unit 10, and the cascade unit 10 is used to convert the DC voltage / current into AC voltage / current, and inject active and reactive power into the three-phase power grid. The combination of the battery energy storage unit 20 and the supercapacitor unit 30 produces better transient performance, improves the life of the battery energy storage unit 20 and the compact size of the ESS (Energy Storage System), can provide reactive and active power support for the power grid, has the function of assisting the primary frequency regulation of the power grid and providing inertia, and can temporarily replace the standard STATCOM voltage support.

[0051] In summary, the disclosed embodiment provides a high-voltage cascade power compensation circuit, the circuit comprising: a three-phase high-voltage cascade converter connected to a three-phase power grid, each phase of the three-phase high-voltage cascade converter comprising a plurality of cascade units connected in series, the cascade units being connected in series with battery energy storage units and supercapacitor units connected in parallel with each other. Based on the traditional high-voltage cascade topology, a supercapacitor unit is connected in parallel to the DC bus of the cascade unit through a DC-DC, and the combination of the battery energy storage unit and the supercapacitor unit produces better transient performance, improves the life of the battery energy storage unit and the compact size of the ESS (Energy Storage System), can provide reactive and active power support for the power grid, has the function of assisting the primary frequency modulation of the power grid and providing inertia, and can temporarily replace the standard STATCOM voltage support.

[0052] In some embodiments, the supercapacitor unit 30 includes: a DCDC converter 301 and a supercapacitor energy storage module 302 connected in series. The DCDC converter 301 is used to convert the DC voltage provided by the supercapacitor energy storage module 302 into the same DC voltage as the battery energy storage unit 20. Exemplarily, the supercapacitor energy storage module 302 can be a supercapacitor.

[0053] In some embodiments, the cascade unit 10 includes a single-phase H-bridge inverter. Figure 1b FIG. 1 is a schematic diagram of a circuit topology of a cascade unit according to an exemplary embodiment. Figure 1b As shown, the circuit topology composed of IGBTs Q1-Q6 constitutes an H-bridge inverter, the LC connected in series between Q6 and the ground constitutes an LC filter circuit, and the diodes D1 and D2 connected in reverse parallel between the midpoint of the first bridge arm composed of Q1 and Q2 and the midpoint of the second bridge arm composed of Q3 and Q4 are used for voltage isolation.

[0054] Figure 2 FIG. 1 is a flow chart of a method for determining parameters of a high-voltage cascade power compensation circuit according to an exemplary embodiment. Figure 2 As shown, the embodiment of the present disclosure provides a method for determining parameters of a high-voltage cascade power compensation circuit, the high-voltage cascade power compensation circuit comprising: a three-phase high-voltage cascade converter connected to a three-phase power grid, each phase of the three-phase high-voltage cascade converter comprising a plurality of cascade units 10 connected in series, the cascade unit 10 being connected in series with a battery energy storage unit 20 and a super capacitor unit 30 connected in parallel with each other; the method for determining parameters of the high-voltage cascade power compensation circuit may comprise the following steps:

[0055] In step S110, the DC side voltage of the cascade unit is determined according to the grid voltage level of the three-phase grid and the number of cascade units.

[0056] In this step, the AC side voltage VAC of the cascade unit 10 is determined according to the grid voltage level UAC of the three-phase grid and the number N of the cascade units 10, and then the DC side voltage VDC of the cascade unit 10 is determined according to the AC side voltage VAC of the cascade unit 10. Exemplarily, VAC=UAC / N, VAC=mVDC. m is the modulation ratio, and the value range can be 0.9-1.4.

[0057] In step S120, the active power and reactive power that the cascade unit needs to process are determined according to the DC side voltage of the cascade unit.

[0058] In this step, the active power P and reactive power Q that the cascade unit 10 needs to process are determined according to the DC side voltage VDC of the cascade unit 10. Exemplarily, P=VDC*m*I*COSθ, Q=VDC*m*I*SINθ, where I is the phase current, θ is the power factor, and m is the modulation ratio, which can range from 0.9 to 1.4.

[0059] Figure 3 FIG. 1 is a flow chart of a method for determining parameters of a high-voltage cascade power compensation circuit according to an exemplary embodiment. Figure 3 As shown, the method for determining the parameters of the high-voltage cascade power compensation circuit may also include the following steps:

[0060] In step S130, the power capacity of the battery energy storage unit is determined according to the DC link voltage.

[0061] In this step, the power capacity PB of the battery energy storage unit 20 is determined according to the DC link voltage VDC. Exemplarily, PB=VDC*IDC, where IDC is the discharge current of the battery energy storage unit 20.

[0062] Figure 4 FIG. 1 is a flow chart of a method for determining parameters of a high-voltage cascade power compensation circuit according to an exemplary embodiment. Figure 4 As shown, the method for determining the parameters of the high-voltage cascade power compensation circuit may also include the following steps:

[0063] In step S140, the active power that needs to be output by the supercapacitor energy storage module in the supercapacitor unit is determined according to the active power that needs to be processed by the cascade unit and the power capacity of the battery energy storage unit.

[0064] In this step, the active power PC that the supercapacitor energy storage module 302 in the supercapacitor unit 30 needs to output is determined according to the active power P that the cascade unit 10 needs to process and the power capacity PB of the battery energy storage unit. Exemplarily, PC=P-PB.

[0065] In step S150, the capacitor capacity of the supercapacitor energy storage module is determined according to the active power that the supercapacitor energy storage module needs to output.

[0066] In this step, the capacitor capacity C1 of the supercapacitor energy storage module 302 is determined according to the active power PC that the supercapacitor energy storage module 302 needs to output.

[0067] For example, 0.5C1*VDC*VDC=3600PC, then C1=7200PC / (VDC*VDC).

[0068] Figure 5 FIG. 1 is a flow chart of a method for determining parameters of a high-voltage cascade power compensation circuit according to an exemplary embodiment. Figure 5 As shown, the method for determining the parameters of the high-voltage cascade power compensation circuit may include the following steps:

[0069] In step S210, the voltage fluctuation range of the supercapacitor energy storage module is determined according to the DC side voltage and device parameters of the cascade unit.

[0070] In this step, the voltage fluctuation range of the supercapacitor energy storage module 302 is determined according to the DC side voltage VDC and the device parameters of the cascade unit 10. Exemplarily, the voltage fluctuation range of the supercapacitor energy storage module 302 may be greater than or equal to VDC*Dmin and less than or equal to VDC*Dmax, where Dmin and Dmax are the minimum and maximum values ​​of the duty cycle of the PWM control signal of the IGBT of the cascade unit 10, respectively.

[0071] In step S220, the reactive power that the supercapacitor energy storage module needs to output is determined according to the active power that needs to be processed by the cascade unit and the power capacity of the battery energy storage unit.

[0072] In this step, the reactive power Q that the supercapacitor energy storage module 302 in the supercapacitor unit 30 needs to output is determined according to the active power P that the cascade unit 10 needs to process and the power capacity PB of the battery energy storage unit. The specific calculation method can refer to the above step S120 and will not be repeated here.

[0073] In step S230, the capacitor capacity of the supercapacitor energy storage module is determined according to the voltage fluctuation range of the supercapacitor energy storage module and the reactive power that the supercapacitor energy storage module needs to output.

[0074] In this step, the capacitor capacity C2 of the supercapacitor energy storage module 302 is determined according to the voltage fluctuation range of the supercapacitor energy storage module 302 and the reactive power Q that the supercapacitor energy storage module 302 needs to output. Exemplarily, the capacitor capacity C2 of the supercapacitor energy storage module 302 can be determined by the following formula: C2 = Q / (VDC(Dmax 2 -Dmin 2 )).

[0075] In summary, the embodiment of the present disclosure provides a method for determining parameters of a high-voltage cascade power compensation circuit, the method comprising: determining the DC side voltage of the cascade unit according to the grid voltage level of the three-phase grid and the number of cascade units; determining the active power and reactive power that the cascade unit needs to process according to the DC side voltage of the cascade unit, determining the power capacity of the battery energy storage unit according to the DC side voltage, determining the active power that the supercapacitor energy storage module in the supercapacitor unit needs to output according to the active power that the cascade unit needs to process and the power capacity of the battery energy storage unit; determining the capacitor capacity of the supercapacitor energy storage module according to the active power that the supercapacitor energy storage module needs to output. Alternatively, determining the voltage fluctuation range of the supercapacitor energy storage module according to the DC side voltage and device parameters of the cascade unit; determining the active power that the supercapacitor energy storage module needs to output according to the active power that the cascade unit needs to process and the power capacity of the battery energy storage unit; determining the capacitor capacity of the supercapacitor energy storage module according to the voltage fluctuation range of the supercapacitor energy storage module and the active power that the supercapacitor energy storage module needs to output. The disclosed embodiment is based on the traditional high-voltage cascade topology. A supercapacitor unit is connected in parallel to the DC bus of the cascade unit through a DC-DC. The combination of the battery energy storage unit and the supercapacitor unit produces better transient performance, improves the life of the battery energy storage unit and the compact size of the ESS (Energy Storage System), can provide reactive and active power support for the power grid, has the function of assisting the primary frequency regulation of the power grid and providing inertia, and can temporarily replace the standard STATCOM voltage support.

[0076] Figure 6 FIG. 6 is a block diagram of a high-voltage cascade power compensation circuit parameter determination device 600 according to an exemplary embodiment. Figure 6 As shown, the embodiment of the present disclosure provides a device for determining parameters of a high-voltage cascade power compensation circuit, wherein the high-voltage cascade power compensation circuit comprises: a three-phase high-voltage cascade converter connected to a three-phase power grid, wherein each phase of the three-phase high-voltage cascade converter comprises a plurality of cascade units 10 connected in series, wherein the cascade unit 10 is connected in series with a battery energy storage unit 20 and a super capacitor unit 30 connected in parallel with each other; the device may comprise the following modules:

[0077] The first determination module 610 is used to determine the DC side voltage of the cascade unit according to the grid voltage level of the three-phase grid and the number of cascade units.

[0078] The second determination module 620 is used to determine the active power and reactive power that the cascade unit needs to process according to the DC side voltage of the cascade unit.

[0079] Optionally, the device further includes a third determination module, configured to determine the power capacity of the battery energy storage unit according to the DC side voltage.

[0080] Optionally, the device further includes a fourth determination module, configured to determine the active power that needs to be output by the supercapacitor energy storage module in the supercapacitor unit according to the active power that needs to be processed by the cascade unit and the power capacity of the battery energy storage unit;

[0081] The capacitor capacity of the supercapacitor energy storage module is determined according to the active power that the supercapacitor energy storage module needs to output.

[0082] Optionally, the fourth determination module is further used to determine the voltage fluctuation range of the supercapacitor energy storage module according to the DC side voltage and device parameters of the cascade unit;

[0083] Determine the reactive power that the supercapacitor energy storage module needs to output according to the active power that the cascade unit needs to process and the power capacity of the battery energy storage unit;

[0084] The capacitor capacity of the supercapacitor energy storage module is determined according to the voltage fluctuation range of the supercapacitor energy storage module and the reactive power that the supercapacitor energy storage module needs to output.

[0085] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the circuit, and will not be elaborated here.

[0086] In summary, an embodiment of the present disclosure provides a device for determining parameters of a high-voltage cascade power compensation circuit, wherein the high-voltage cascade power compensation circuit includes: a three-phase high-voltage cascade converter connected to a three-phase power grid, wherein each phase of the three-phase high-voltage cascade converter includes a plurality of cascade units connected in series, and the cascade units are connected in series with battery energy storage units and supercapacitor units connected in parallel with each other; the device includes: a first determination module for determining the DC side voltage of the cascade unit according to the grid voltage level of the three-phase power grid and the number of cascade units; and a second determination module for determining the active power and reactive power that the cascade unit needs to process according to the DC side voltage of the cascade unit. The disclosed embodiment is based on the traditional high-voltage cascade topology. A supercapacitor is connected in parallel to the DC bus of the cascade unit through a DC-DC. The combination of the battery energy storage unit and the supercapacitor produces better transient performance, improves the life of the battery energy storage unit and the compact size of the ESS (Energy Storage System), can provide reactive and active power support for the power grid, has the function of assisting the primary frequency regulation of the power grid and providing inertia, and can temporarily replace the standard STATCOM voltage support.

[0087] Figure 7 FIG. 7 is a block diagram of an electronic device 700 according to an exemplary embodiment. Figure 7 As shown, the electronic device 700 may include: a processor 701 and a memory 702. The electronic device 700 may also include one or more of a multimedia component 703, an input / output (I / O) interface 704, and a communication component 705.

[0088] The processor 701 is used to control the overall operation of the electronic device 700 to complete all or part of the steps in the above-mentioned method for determining the parameters of the high-voltage cascade power compensation circuit. The memory 702 is used to store various types of data to support the operation of the electronic device 700, and these data may include, for example, instructions for any application or circuit used to operate on the electronic device 700, and application-related data, such as contact data, sent and received messages, pictures, audio, video, etc. The memory 702 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, referred to as EPROM), programmable read-only memory (Programmable Read-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic memory, flash memory, disk or optical disk. The multimedia component 703 may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may be further stored in the memory 702 or sent through the communication component 705. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 704 provides an interface between the processor 701 and other interface modules, and the other interface modules may be keyboards, mice, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 705 is used for wired or wireless communication between the electronic device 700 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, is not limited here. Therefore, the corresponding communication component 705 may include: Wi-Fi module, Bluetooth module, NFC module, etc.

[0089] In an exemplary embodiment, the electronic device 700 can be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic components to execute the above-mentioned high-voltage cascade power compensation circuit parameter determination method.

[0090] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, and when the program instructions are executed by a processor, the steps of the above-mentioned method for determining parameters of a high-voltage cascade power compensation circuit are implemented. For example, the computer-readable storage medium may be the above-mentioned memory 702 including program instructions, and the above-mentioned program instructions may be executed by the processor 701 of the electronic device 700 to complete the above-mentioned method for determining parameters of a high-voltage cascade power compensation circuit.

[0091] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0092] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0093] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A high voltage cascade power compensation circuit, characterized in that: The circuit comprises: A three-phase high-voltage cascade converter connected to a three-phase power grid, wherein each phase of the three-phase high-voltage cascade converter comprises a plurality of cascade units connected in series, wherein the cascade units are connected in series with battery energy storage units and supercapacitor units connected in parallel with each other.

2. The high voltage cascade power compensation circuit according to claim 1, characterized in that: The supercapacitor unit comprises: DCDC converter and supercapacitor energy storage module connected in series.

3. The high voltage cascade power compensation circuit according to claim 1, characterized in that: The cascade unit includes a single-phase H-bridge inverter.

4. A method for determining parameters of a high-voltage cascade power compensation circuit, characterized in that: The high-voltage cascade power compensation circuit comprises: a three-phase high-voltage cascade converter connected to a three-phase power grid, each phase of the three-phase high-voltage cascade converter comprises a plurality of cascade units connected in series, and the cascade units are connected in series with battery energy storage units and supercapacitor units connected in parallel with each other; the method comprises: Determining the DC side voltage of the cascade unit according to the grid voltage level of the three-phase grid and the number of cascade units; The active power and reactive power that the cascade unit needs to process are determined according to the DC side voltage of the cascade unit.

5. The method for determining parameters of a high-voltage cascade power compensation circuit according to claim 4, characterized in that: The method further comprises: The power capacity of the battery energy storage unit is determined according to the DC side voltage.

6. The method for determining parameters of a high-voltage cascade power compensation circuit according to claim 5, characterized in that: The method further comprises: Determine the active power that needs to be output by the supercapacitor energy storage module in the supercapacitor unit according to the active power that needs to be processed by the cascade unit and the power capacity of the battery energy storage unit; The capacitor capacity of the supercapacitor energy storage module is determined according to the active power that the supercapacitor energy storage module needs to output.

7. The method for determining parameters of a high-voltage cascade power compensation circuit according to claim 5, characterized in that: The method comprises: Determining the voltage fluctuation range of the supercapacitor energy storage module according to the DC side voltage and device parameters of the cascade unit; Determine the reactive power that the supercapacitor energy storage module needs to output according to the active power that the cascade unit needs to process and the power capacity of the battery energy storage unit; The capacitor capacity of the supercapacitor energy storage module is determined according to the voltage fluctuation range of the supercapacitor energy storage module and the reactive power that the supercapacitor energy storage module needs to output.

8. A device for determining parameters of a high-voltage cascade power compensation circuit, characterized in that: The high-voltage cascade power compensation circuit comprises: a three-phase high-voltage cascade converter connected to a three-phase power grid, each phase of the three-phase high-voltage cascade converter comprises a plurality of cascade units connected in series, and the cascade units are connected in series with battery energy storage units and supercapacitor units connected in parallel with each other; the device comprises: A first determination module, used to determine the DC side voltage of the cascade unit according to the grid voltage level of the three-phase grid and the number of cascade units; The second determination module is used to determine the active power and reactive power that the cascade unit needs to process according to the DC side voltage of the cascade unit.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 4 to 7 are implemented.

10. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 4 to 7.

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