Mesh-forming type current source inverter circuit, control method and related equipment
By using current source inverters controlled by IGCT and DSP chips in medium and high voltage systems, the problems of large number of components, large size, and high cost of voltage source inverters have been solved, thereby improving grid stability and response speed.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JINAN UNIVERSITY
- Filing Date
- 2025-12-03
- Publication Date
- 2026-04-17
AI Technical Summary
Voltage source inverters for medium and high voltage systems have problems such as a large number of power devices, a large number of DC electrolytic capacitors, large size, and high cost.
An integrated gate commutated thyristor (IGCT) is used as the switching transistor in the current source grid inverter, and a DSP chip is used to generate control signals. A CL filter and a single resonant controller with high gain at the fundamental frequency are used to optimize the voltage inner loop control.
The number of power devices was reduced, the response speed of the voltage inner loop and the stability of the power grid were improved, and the size and cost of the equipment were reduced.
Smart Images
Figure CN121886992A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power grid connection technology, and in particular to a grid-connected current source inverter circuit, control method and related equipment. Background Technology
[0002] As the penetration rate of new energy sources in new power systems continues to increase, the strength of the power grid is weakening. Grid-connected inverters for wind power, photovoltaics, and energy storage are gradually transitioning from grid-following current control modes with phase-locked loops (PLLs) to grid-connected voltage control modes to improve the stability of inverter grid connection under weak grid conditions. The control system of a grid-connected inverter contains an outer power loop and an inner voltage loop. The active power loop controller includes virtual inertia control, while the controllers for the active and reactive power loops generate the frequency, phase angle, and voltage amplitude of voltage reference values for tracking control by the inner voltage loop controller. This control system architecture enables the grid-connected inverter to actively support the voltage and frequency of the power grid. Currently, the mainstream topology of grid-connected inverters is based on voltage source inverters. Low-voltage systems mostly use two-level or three-level topologies, while voltage source inverters for medium and high-voltage systems are mostly based on modular multilevel (MMC) topologies. Typical applications of grid-connected inverters in medium and high-voltage systems include medium-voltage energy storage grid-connected inverters and receiving-end inverters for high-voltage direct current (HVDC) transmission. Medium and high voltage source inverters using the MMC topology can achieve flexible control, but they also have problems such as requiring a large number of power devices, a large number of DC electrolytic capacitors, large size, and high cost.
[0003] In summary, the technical problems existing in the relevant technologies need to be improved. Summary of the Invention
[0004] The main objective of this application is to propose a grid-type current source inverter circuit, control method, and related equipment to solve problems such as a large number of power devices, a large number of DC electrolytic capacitors, large size, and high cost.
[0005] To achieve the above objectives, one aspect of this application provides a grid-type current source inverter circuit, the circuit comprising: a DSP chip, and a current source inverter integrating an integrated gate commutation thyristor; The DSP chip is used to generate control signals to drive the current source inverter; The current source inverter integrates an integrated gate commutator thyristor, which is connected to the DSP chip. The DSP chip controls the on / off state of the current source inverter through the integrated gate commutator thyristor.
[0006] In some embodiments, the circuit further includes: CL filter; The CLOne end of the filter is connected to the current source inverter, and the CL The other end of the filter is connected to the power grid.
[0007] One aspect of this application proposes a control method for a grid-type current source inverter circuit. In some embodiments, the duty cycle signal is determined within a first time period according to a preset calculation method, wherein the first time period is less than half of the minimum pulse width of the IGCT; Load the duty cycle signal; The control signal for driving the current source inverter is generated based on the loaded duty cycle signal.
[0008] In some embodiments, determining the duty cycle signal within a first time period according to a preset calculation method includes: During the second time period, a sample signal in the current cycle is obtained. The sample signal includes a sample voltage and a voltage controller output signal from the previous cycle. The voltage controller output signal is used to represent a sinusoidal modulated current signal obtained after the sample voltage has been calculated and processed. In the third time period, the total modulation current is determined using the sample voltage and the voltage controller output signal from the previous cycle, and the duty cycle signal is determined using the total modulation current. The first time period is the sum of the second time period and the third time period.
[0009] In some embodiments, determining the total modulation current using the sample voltage and the voltage controller output signal from the previous cycle during the third time period, and determining the duty cycle signal using the total modulation current, includes: The calculated value of the active damping term is determined based on the preset active damping coefficient and the sample voltage; By combining the calculated value of the active damping term with the voltage controller output signal of the previous cycle, the total modulation current is obtained, and the duty cycle signal is determined using the total modulation current.
[0010] In some embodiments, the voltage controller is a single resonant controller.
[0011] To achieve the above objectives, another aspect of this application provides a control device for a grid-type current source inverter circuit, the device comprising: The PWM loading module is used to load the duty cycle signal; The PWM generation module is used to generate control signals to drive the current source inverter based on the loaded duty cycle signal.
[0012] To achieve the above objectives, another aspect of this application provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the method described above.
[0013] To achieve the above objectives, another aspect of the embodiments of this application proposes a computer-readable storage medium storing a computer program that, when executed by a processor, implements the methods described above.
[0014] To achieve the above objectives, another aspect of this application provides a computer program product, including a computer program that, when executed by a processor, implements the methods described above. The embodiments of this application include at least the following beneficial effects: This application provides a grid-type current source inverter circuit, control method, and related equipment. The grid-type current source inverter circuit of this solution includes: a DSP chip, and a current source inverter integrating an integrated gate commutated thyristor; the DSP chip is used to generate control signals to drive the current source inverter; the current source inverter integrates an integrated gate commutated thyristor, which is connected to the DSP chip, and the DSP chip controls the on / off state of the current source inverter through the integrated gate commutated thyristor. This embodiment proposes using an IGCT as the switching transistor of the current source grid-type inverter, and the IGCT itself has the characteristics of high rated voltage and large rated current, which can reduce the number of power devices compared with other technologies. Attached Figure Description
[0015] Figure 1 This is a circuit structure diagram of a grid-type current source inverter provided in an embodiment of this application; Figure 2 This is a flowchart of the control method for a grid-type current source inverter circuit provided in an embodiment of this application; Figure 3 This is a schematic diagram illustrating the time delay of the DSP chip generating the duty cycle signal; Figure 4 This is a block diagram of the voltage inner loop control of a grid-type current source inverter provided in an embodiment of this application; Figure 5 It is an active power waveform diagram; Figure 6 This is a schematic diagram of capacitor voltage frequency; Figure 7 It is a waveform diagram of grid voltage, capacitor voltage and grid-connected current during power change; Figure 8 It is another waveform diagram of grid voltage, capacitor voltage and grid-connected current during power change; Figure 9This is a supplementary description of bidirectional power flow provided in the embodiments of this application.
[0016] Figure 10 This is a schematic diagram of the control structure of the grid-type current source inverter circuit provided in the embodiments of this application; Figure 11 This is a schematic diagram of the hardware structure of the electronic device provided in the embodiments of this application. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit it. In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this application; they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.
[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.
[0019] Before providing a detailed description of the embodiments of this application, some of the nouns and terms involved in the embodiments of this application will be explained first. The nouns and terms involved in the embodiments of this application are subject to the following interpretations.
[0020] 1) A grid-connected current source inverter is a power electronic device with active inertial support and voltage regulation capabilities. It is mainly used in new energy grid connection and microgrids to enhance grid stability.
[0021] 2) An integrated gate-commutated thyristor (IGCT) is a high-voltage, high-power power electronic device primarily used in high-voltage direct current transmission, medium-voltage frequency converters, and rail transit traction systems. Its core technological feature is the low-inductance integration of the gate drive circuit with the thyristor body, achieving high-speed, reliable turn-off capability similar to a transistor. It is typically used in conjunction with an anti-parallel diode (integrated or closely matched). While the IGCT inherits the advantages of low on-state voltage drop and low conduction loss of traditional thyristors, and its switching frequency is orders of magnitude higher than that of traditional gate-turn-off thyristors, it still belongs to the low-to-medium frequency switching device category within the overall power electronic device spectrum.
[0022] 3) VSG control is an advanced power electronic control technology that simulates the characteristics of synchronous generators. Its core is to endow the inverter with inertia and damping characteristics through algorithms.
[0023] 4) Digital signal processing technology (DSP). DSP chips are chips that can implement digital signal processing technology.
[0024] 5) Pulse width modulation (PWM) is a method for digitally encoding analog signal levels.
[0025] In related technologies, the mainstream topology of grid-connected inverters is based on voltage source inverters. Low-voltage systems mostly adopt two-level or three-level topologies, while voltage source inverters for medium and high voltage systems are mostly based on modular multilevel (MMC) topologies. Typical applications of grid-connected inverters in medium and high voltage systems include medium-voltage energy storage grid-connected inverters and receiving-end inverters for high-voltage direct current (HVDC) transmission. Medium and high voltage source inverters using MMC topologies can achieve flexible control, but they suffer from problems such as requiring a large number of power devices, a large number of DC electrolytic capacitors, large size, and high cost.
[0026] In view of this, this application provides a grid-type current source inverter circuit, control method, and related equipment. The grid-type current source inverter circuit of this solution includes: a DSP chip and a current source inverter integrating an integrated gate commutated thyristor; the DSP chip is used to generate control signals to drive the current source inverter; the current source inverter integrates an integrated gate commutated thyristor, which is connected to the DSP chip, and the DSP chip controls the on / off state of the current source inverter through the integrated gate commutated thyristor. This embodiment proposes using an IGCT as the switching transistor of the current source grid-type inverter, and the IGCT itself has the characteristics of high rated voltage and large rated current, which can reduce the number of power devices compared with other technologies.
[0027] This application provides a grid-type current source inverter circuit, such as... Figure 1 As shown, it includes: a DSP chip and a current source inverter; the DSP chip is used to generate control signals to drive the current source inverter; the current source inverter uses an IGCT as a power device, which is connected to the DSP chip to control the on / off state of the IGCT.
[0028] Voltage source inverters using the MMC topology in medium and high voltage applications require a large number of power devices, DC electrolytic capacitors, and are bulky and expensive. This embodiment proposes using IGCTs with reverse voltage withstand capability as the switching transistor, which reduces the number of power devices compared to other technologies.
[0029] In some embodiments, the circuit further includes: CL filter; CL One end of the filter is connected to the current source inverter. CL The other end of the filter is connected to the power grid.
[0030] This invention uses active voltage damping suppression by capacitors. CL The system resonates and uses a single resonant controller with high gain at the fundamental frequency as the voltage controller, which effectively improves the low-frequency gain of the voltage inner loop, thereby increasing the response speed of the voltage inner loop when the voltage setpoint changes.
[0031] Figure 2 This is an optional flowchart of the control method for the grid-type current source inverter circuit provided in the embodiments of this application. Figure 2 The method described herein, when applied to a DSP chip, may include, but is not limited to, steps S201 to S203.
[0032] Step S201: Determine the duty cycle signal within the first time period according to the preset calculation method. The first time period is less than half of the minimum pulse width of IGCT.
[0033] Step S202: Load the duty cycle signal.
[0034] Step S203: Generate control signals for driving the current source inverter based on the loaded duty cycle signal.
[0035] During operation, the main tasks of the DSP chip in a grid-type current source inverter circuit include: 1. Sampling First, sampling is performed in the pulse width modulation (PWM) carrier peak and trough trigger sampling module of the digital signal processor (DSP) to obtain... Figure 1 capacitor voltage in v fabc and grid current i gabc The peripheral hardware circuit detects the capacitor voltage. v fabc Signal processing is performed to obtain a voltage signal that the DSP can receive.
[0036] 2. Calculation The sampled capacitor voltage v fabc The voltage controller output value is obtained through processing by the voltage controller. i v As the output signal of the voltage controller, it is used for the next modulation wave calculation.
[0037] At the same time, the sampled capacitor voltage v f Multiply by the active damping coefficient K The calculated value of the active damping term is obtained. This calculated value is then compared with the output signal of the voltage controller obtained in the previous cycle. i v The total modulated current is calculated by summing the values, and then the total modulated current is used to calculate the modulated wave using space vector modulation (SVPWM). Because the DSP chip in this invention controls the current source inverter at a low switching frequency, the SVPWM calculation is time-consuming. T d The relative switching period is negligible. The duty cycle calculated by modulation is limited by a saturator, and the upper and lower limits of the saturator determine the minimum narrow pulse duty cycle allowed by the IGCT.
[0038] The duty cycle calculated by modulation is loaded into the DSP chip via the immediate load mode.
[0039] The detailed process of the above digital control delay method is as follows: Figure 3 As shown. The power device IGCT used in this invention needs to limit the minimum pulse width. Taking several common IGCTs on the market as a reference, the minimum pulse width of the IGCT used in this invention can be considered as... T mp =40μs. Specifically, in this invention, the switching frequency is 1kHz, and the duty cycle calculated by modulation needs to be within the range of 0.04 to 0.96. This means that as long as... T d < T mp / 2 T d < 20μs, then T d This can be disregarded, consistent with the previous analysis.
[0040] In some embodiments, the voltage inner loop control block diagram of the grid-type current source inverter provided in this application is as follows: Figure 4 As shown.
[0041] Among them, the transfer function from inverter output current to capacitor voltage. G vc (s) Represented as: (1) In the formula, ω r express CL Filter resonant frequency: (2) After discretizing equation (1), the discrete domain transfer function is obtained. G vc (z) as follows: (3) In the formula, T s This indicates the sampling period. Therefore, the transfer function of the controlled object in the voltage inner loop... G p (s) Represented as: (4) Decide G p (z) The characteristic equation for the number of external poles of the unit circle is expressed as: (5) exist f r <f s Within the range of / 4, utilize bilinear transformation z = ( w+1 ) / ( w-1 Map the unit circle of the z-domain in equation (5) to w By finding the imaginary axis of the domain, a new characteristic equation can be obtained. Applying the Routh-Hurwitz stability criterion, the active damping coefficient can be derived. K The range of values for: (6) This patent uses a single resonant controller as the voltage controller, and its discrete-domain transfer function is expressed as: (7) In the formula, K r This represents the resonant gain of the resonant controller. ω 0 and ω b Let represent the resonant frequency and the resonant bandwidth, respectively. Therefore, the open-loop transfer function of the inner voltage loop is expressed as: (8) -180° cross frequency f p Substitute into equation (8) and simultaneously let The imaginary part is 0, and the solution obtained is... f p Substituting into equation (8), while leaving a 3dB amplitude margin, we get: (9) Solving equation (9) yields the maximum resonant gain. Krm .
[0042]
[0043] Table 1.1 Core Electrical Parameters of Grid-Type Current Source Inverter A model of a grid-type current source inverter circuit was constructed, and the main circuit parameters and DSP chip parameters are shown in Table 1.1. During the simulation, the active power command... P ref The reactive power command jumps from 0W to 5MW. Q ref Keep it at 0. Active power P Waveform as Figure 5 As shown, the active power P Accurately tracks commands in steady state. Under the VSG control strategy, the active power loop simulates the inertia characteristics and frequency regulation process of a synchronous generator. By adjusting the frequency of the capacitor voltage, its phase is adjusted, thereby changing the phase difference between the capacitor voltage and the grid voltage, ultimately achieving adjustment of the transmitted active power. (Capacitor voltage frequency) f c like Figure 6 As shown, corresponding to the transient process of the power waveform, the effectiveness of the VSG control strategy applied to the current source inverter and the grid inertia support capability of the grid-connected current source inverter circuit can be verified. During the power change process, the grid voltage... v g capacitor voltage v f With grid-connected current i g The waveform is as follows Figure 7 and Figure 8 As shown, v f The effectiveness of the voltage inner loop control was verified by tracking the voltage command generated by the active loop output during the power point tracking process.
[0044] To ensure bidirectional power transmission, this application provides an example of a PWM-controlled current source inverter using a double-pole double-throw relay, as shown in the topology diagram below. Figure 9 As shown, bidirectional power transmission can be achieved by controlling the relay to reverse the positive and negative polarities of the DC side. It should also be noted that other solutions for achieving bidirectional power transmission in a current source inverter include: 1. Replacing the original semiconductor switching device with a new type of semiconductor device or switching module that allows bidirectional current flow when on and reverse voltage blocking capability when off; 2. Using a polarity converter composed of four thyristors on the DC side.
[0045] Steps S201 to S203 as shown in the embodiments of this application involve determining a duty cycle signal within a first time period according to a preset calculation method. The first time period is less than half the minimum pulse width of the IGCT. The duty cycle signal is loaded. A control signal for driving the current source inverter is generated based on the loaded duty cycle signal. This can effectively reduce the delay caused by digital control and significantly improve the voltage inner loop bandwidth and response speed of the grid-type current source inverter circuit compared to other technologies.
[0046] Please see Figure 10 This application also provides a control device for a grid-type current source inverter circuit, which can implement the above-described method. The device includes: The determination module 1001 is used to determine the duty cycle signal within a first time period according to a preset calculation method, wherein the first time period is less than half of the minimum pulse width of the IGCT. PWM loading module 1002 is used to load the duty cycle signal; The PWM generation module 1003 is used to generate a control signal to drive the current source inverter based on the loaded duty cycle signal.
[0047] In some embodiments, the determining module 1001 is used to obtain a sample signal in the current period during a second time period. The sample signal includes a sample voltage and a voltage controller output signal in the previous period. The voltage controller output signal is used to represent a sinusoidal modulated current signal obtained after the sample voltage has been calculated and processed. In the third time period, the total modulation current is determined using the sample voltage and the voltage controller output signal from the previous cycle, and the duty cycle signal is determined using the total modulation current. The first time period is the sum of the second time period and the third time period.
[0048] In some embodiments, the determining module 1001 is configured to: The calculated value of the active damping term is determined based on the preset active damping coefficient and the sample voltage; By combining the calculated value of the active damping term with the voltage controller output signal of the previous cycle, the total modulation current is obtained, and the duty cycle signal is determined using the total modulation current.
[0049] In some embodiments, the voltage controller is a single resonant controller.
[0050] It is understood that the content of the above method embodiments is applicable to the present device embodiments. The specific functions implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.
[0051] This application also provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the above-described method. This electronic device can be any smart terminal, including tablet computers, in-vehicle computers, etc.
[0052] It is understood that the content of the above method embodiments is applicable to this device embodiment. The specific functions implemented by this device embodiment are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.
[0053] Please see Figure 11 , Figure 11 The hardware structure of an electronic device according to another embodiment is illustrated. The electronic device includes: The processor 1101 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application. The memory 1102 can be implemented as a read-only memory (ROM), static storage device, dynamic storage device, or random access memory (RAM). The memory 1102 can store the operating system and other applications. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 1102 and is called and executed by the processor 1101 using the methods described in the embodiments of this application. Input / output interface 1103 is used to implement information input and output; The communication interface 1104 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.). Bus 1105 transmits information between various components of the device (e.g., processor 1101, memory 1102, input / output interface 1103, and communication interface 1104); The processor 1101, memory 1102, input / output interface 1103 and communication interface 1104 are connected to each other within the device via bus 1105.
[0054] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method.
[0055] It is understood that the content of the above method embodiments is applicable to this storage medium embodiment. The specific functions implemented in this storage medium embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.
[0056] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.
[0057] It is understood that the content of the above method embodiments is applicable to the embodiments of this program product. The specific functions implemented by the embodiments of this program product are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.
[0058] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
[0059] The grid-type current source inverter circuit, control method, and related equipment provided in this application include: a DSP chip; a current source inverter integrating an integrated gate commutated thyristor; the DSP chip is used to generate control signals to drive the current source inverter; the current source inverter integrates an integrated gate commutated thyristor, which is connected to the DSP chip, and the DSP chip controls the on / off state of the current source inverter through the integrated gate commutated thyristor. This embodiment proposes using an IGCT as the switching transistor of the current source grid-type inverter, and the IGCT itself has the characteristics of high rated voltage and large rated current, which can reduce the number of power devices compared with other technologies.
[0060] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.
[0061] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.
[0062] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.
[0063] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or appropriate combinations thereof.
[0064] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0065] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.
[0066] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.
[0067] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0068] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.
[0069] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part 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 multiple 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 of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0070] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.
Claims
1. A meshed current source inverter circuit, characterized by, include: DSP chip, current source inverter with integrated gate commutated thyristor; The DSP chip is used to generate control signals to drive the current source inverter; The current source inverter integrates an integrated gate commutator thyristor, which is connected to the DSP chip. The DSP chip controls the on / off state of the current source inverter through the integrated gate commutator thyristor.
2. The circuit according to claim 1, characterized in that, The circuit further comprises: CL a filter; The CL One end of the filter is connected to the current source inverter, and the CL The other end of the filter is connected to the power grid.
3. A control method for a grid-type current source inverter circuit, applied to a DSP chip as described in any one of claims 1 or 2, characterized in that, The method includes: According to a preset calculation method, the duty cycle signal is determined within a first time period, where the first time period is less than half of the minimum pulse width of the integrated gate commutated thyristor. Load the duty cycle signal; The control signal for driving the current source inverter is generated based on the loaded duty cycle signal.
4. The method according to claim 3, characterized in that, The step of determining the duty cycle signal within a first time period according to a preset calculation method includes: During the second time period, a sample signal in the current cycle is obtained. The sample signal includes a sample voltage and a voltage controller output signal from the previous cycle. The voltage controller output signal is used to represent a sinusoidal modulated current signal obtained after the sample voltage has been calculated and processed. In the third time period, the total modulation current is determined using the sample voltage and the voltage controller output signal from the previous cycle, and the duty cycle signal is determined using the total modulation current. The first time period is the sum of the second time period and the third time period.
5. The method according to claim 4, characterized in that, In the third time period, the total modulation current is determined using the sample voltage and the voltage controller output signal from the previous cycle, and the duty cycle signal is determined using the total modulation current, including: The calculated value of the active damping term is determined based on the preset active damping coefficient and the sample voltage; By combining the calculated value of the active damping term with the voltage controller output signal of the previous cycle, the total modulation current is obtained, and the duty cycle signal is determined using the total modulation current.
6. The method according to claim 4, characterized in that, The voltage controller is a single resonant controller.
7. A control device for a grid-type current source inverter circuit, installed in a DSP chip as described in any one of claims 1 to 2, characterized in that, The device includes: The determination module is used to determine the duty cycle signal within a first time period according to a preset calculation method, wherein the first time period is less than half of the minimum pulse width of the integrated gate commutated thyristor. The PWM loading module is used to load the duty cycle signal; The PWM generation module is used to generate control signals to drive the current source inverter based on the loaded duty cycle signal.
8. An electronic device, characterized in that, The electronic device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the method according to any one of claims 3 to 6.
9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 3 to 6.
10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 3 to 6.