Ripple suppression method, energy storage power supply and storage medium

Abstract

The invention discloses a ripple suppression method, an energy storage power supply and a storage medium, and is applied to the technical field of ripple suppression of energy storage power supplies. The method comprises sampling to obtain an output voltage; based on the output voltage and a preset multi-resonance PR controller, a plurality of first control quantities are calculated, and the first control quantities are in one-to-one correspondence based on the frequencies of the to-be-suppressed voltage ripples; calculating a third control quantity based on the first control quantity and a preset second control quantity output by a voltage loop; and calculating the duty ratio of pulse width modulation according to the third control quantity. A plurality of first control quantities that suppress a voltage ripple of an output voltage are calculated using a multi-resonant PR controller. And then, the plurality of first control quantities are superposed on a second control quantity output by the voltage loop, so that when the voltage loop realizes voltage control, a compensation waveform opposite to the ripple waveform is generated, ripple suppression is realized, and ripples of a plurality of frequencies can be suppressed at the same time. In addition, filter capacitance does not need to be increased, and the hardware cost and the system failure rate can be reduced.

Description

Technical Field

[0001] This application belongs to the field of ripple suppression technology for energy storage power supplies, and particularly relates to a ripple suppression method, an energy storage power supply, and a computer-readable storage medium. Background Technology

[0002] Currently, the single-phase PFC (Power Factor Correction) + LLC resonant converter is a classic architecture for low-power to medium-power high-efficiency AC-DC power supplies, widely used in server power supplies, charging piles, home appliance power supplies, industrial power supplies, and other scenarios. The core advantages of this architecture are: the front-stage PFC achieves high power factor and low harmonics, while the rear-stage LLC achieves soft switching and high efficiency.

[0003] However, LLC resonant converters are typically affected by bus voltage ripple, which causes AC-side frequency doubling ripple in the control output. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a ripple suppression method, an energy storage power supply, and a computer-readable storage medium, which can achieve ripple suppression.

[0005] In a first aspect, this application provides a ripple suppression method, the method comprising: The output voltage is obtained by sampling; Based on the output voltage and the preset multi-resonant PR controller, multiple first control quantities are calculated, and the first control quantities correspond one-to-one with the frequency of each voltage ripple to be suppressed. Calculate the third control quantity based on the first control quantity and the second control quantity output by the preset voltage loop; The duty cycle of pulse width modulation is calculated based on the third control quantity.

[0006] In some embodiments, the calculation of multiple first control quantities based on the output voltage and a preset multi-resonant PR controller includes: Based on the frequency of each ripple to be suppressed and a preset reference frequency, each target harmonic is determined, wherein the frequency corresponding to the target harmonic is an even multiple of the reference frequency. Based on the output voltage, each of the target harmonics, and the multi-resonant PR controller, the first control quantity corresponding to each of the target harmonics is calculated.

[0007] In some embodiments, the target harmonics include the 2nd harmonic, the 4th harmonic, and the 6th harmonic; calculating the first control quantity corresponding to each of the target harmonics based on the output voltage, each of the target harmonics, and the multi-resonant PR controller includes: Based on the output voltage, each of the target harmonics, and the multi-resonant PR controller, the first control quantity corresponding to the 2nd, 4th, and 6th harmonics is calculated.

[0008] In some embodiments, the preset reference frequency is determined based on the frequency of the input voltage or the frequency of the input voltage locked by a phase-locked loop.

[0009] In some embodiments, the ripple suppression method further includes: The output current is obtained by sampling; Based on the output current and the preset reference current of the current loop, a fourth control quantity is determined; The preset reference voltage of the voltage loop is updated based on the fourth control quantity.

[0010] In some embodiments, determining the fourth control quantity based on the output current and a preset reference current of the current loop includes: When the output current is greater than the preset reference current, the fourth control quantity is determined to be the current lower limit control quantity, which is determined based on the second control quantity. When the output current is less than or equal to the preset reference current, the fourth control quantity is determined to be the upper limit current control quantity, and the lower limit current control quantity is less than the upper limit current control quantity.

[0011] In some embodiments, the current upper limit control value is 0.

[0012] Secondly, this application provides an energy storage power source, comprising: The system includes a main control board, a charging interface, and a battery. The main control board includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the ripple suppression method described above.

[0013] In some embodiments, the energy storage power supply further includes a single-phase PFC converter and an LLC resonant converter. The single-phase PFC converter converts the AC input from the power grid and outputs it to the bus of the energy storage power supply. The bus voltage is input to the LLC resonant converter, which performs voltage conversion on the input voltage to output the output voltage.

[0014] Thirdly, this application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described ripple suppression method.

[0015] The ripple suppression method, energy storage power supply, and computer-readable storage medium provided in this application obtain the real-time output voltage through sampling. Then, using a multi-resonant PR controller, multiple first control quantities are calculated to suppress the voltage ripple of the output voltage. The number of these first control quantities is determined by the number of ripple frequencies to be suppressed. These multiple first control quantities are then superimposed onto a second control quantity output by the voltage loop. This generates a compensation waveform that is opposite to the ripple waveform when the voltage loop implements voltage control, thus achieving ripple suppression and simultaneously suppressing ripple at multiple frequencies. Furthermore, this application eliminates the need to increase the filter capacitor, reducing hardware costs and system failure rate.

[0016] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram illustrating an application scenario of the ripple suppression method provided in some embodiments of this application; Figure 2 This is a first flowchart illustrating the ripple suppression method provided in certain embodiments of this application; Figure 3 This is a second flowchart illustrating the ripple suppression method provided in certain embodiments of this application; Figure 4 This is a schematic diagram illustrating the first effect of the ripple suppression method provided in certain embodiments of this application; Figure 5 This is a schematic diagram illustrating the second effect of the ripple suppression method provided in certain embodiments of this application; Figure 6 This is a schematic diagram of a ripple suppression device provided in certain embodiments of this application. Detailed Implementation

[0018] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0019] The technical background of this application will be introduced below: When using a voltage PI (Proportional-Integral) controller + PR (Proportional-Resonant) controller for ripple suppression, the PI controller handles the DC component and steady-state deviation of the LLC output voltage. It accelerates the response speed through the proportional element and eliminates static errors through the integral element, ensuring the basic stability of the output voltage. The PR controller targets ripple at specific frequencies such as 100Hz in the LLC output (mostly conducted from the PFC). Through its high gain characteristics at a specific center frequency, it accurately filters out the DC component and high-frequency harmonics, outputting an AC quantity in phase with the PFC, thus specifically suppressing the target ripple.

[0020] This solution employs a ripple suppression method combining a voltage PI controller and a multi-resonant PR controller. This method provides multiple suppressions for AC ripple conducted by the PFC circuit, allowing the LLC circuit to generate a compensation waveform that is the opposite of the ripple waveform. This compensation waveform cancels out the original output ripple, ultimately achieving ripple suppression. Furthermore, it eliminates the need to increase the filter capacitor, reducing hardware costs and system failure rate.

[0021] Please see Figure 1 , Figure 1 This diagram illustrates an application scenario of a ripple suppression method provided in this application. The application scenarios provided in this application include an energy storage power supply 100 and an electronic device 200.

[0022] Here, the energy storage power supply 200 refers to a device capable of storing power. It is generally equipped with a rechargeable battery. By storing a large amount of power in the battery within the energy storage power supply, the energy storage power supply can output the stored electrical energy when needed.

[0023] There are many types of energy storage power supplies, which can be classified according to application scenarios: (1) Portable energy storage: It is generally a small energy storage power supply, using lithium-ion batteries, etc. It is easy to carry and used for outdoor camping, emergency charging and other scenarios. It can power mobile phones, computers, lighting equipment, etc.

[0024] (2) Home energy storage: Used in homes to store solar power or electricity generated during off-peak hours of the power grid for use by home electrical equipment, achieving the purpose of peak shaving and valley filling, saving electricity costs, etc.

[0025] (3) Industrial and commercial energy storage: Used in factories, data centers, shopping malls and other places, it can be used for load regulation, demand-side management, power quality improvement, etc., to help users reduce electricity costs and improve power supply reliability.

[0026] (4) Grid energy storage: It is widely used in power systems to regulate the peak-valley difference of the power grid, smooth the fluctuations of renewable energy generation, and improve the stability and reliability of the power grid. Common types include large lithium-ion battery energy storage power stations, flow battery energy storage power stations, and pumped storage power stations.

[0027] In order to adapt to the increasingly diverse power consumption scenarios, portable energy storage power supplies have emerged. Portable energy storage power supplies, also known as portable lithium-ion battery energy storage power supplies or outdoor power supplies, usually refer to backup or emergency power supplies weighing no more than 18 kg. They use lithium-ion batteries as energy storage components and have AC or DC input charging interfaces as well as AC or DC output interfaces.

[0028] In one alternative embodiment, the energy storage power supply 100 includes a battery, a main control board, a battery management system, an inverter, and a real-time clock module.

[0029] Among them, the battery is the energy core of the energy storage power supply and is the component that stores the power.

[0030] The main control board is the core of the energy storage power supply. The system's wake-up, shutdown, charging judgment, and power consumption management are all controlled by the main control board.

[0031] Among them, the Battery Management System (BMS) is an electronic system used to monitor, protect, optimize and manage batteries (such as lithium batteries, lead-acid batteries, etc.). Its core function is to ensure that the battery works efficiently within a safe range, extend its service life, and provide stable power output to the equipment.

[0032] For example, a battery management system can control the charging and discharging switches to achieve charging and discharging control; and it can achieve battery balancing by detecting the electrical parameters of each cell in the battery.

[0033] An inverter is a power electronic device that converts direct current (DC) to alternating current (AC).

[0034] In one alternative embodiment, the inverter includes a temperature sensor with independent ambient temperature acquisition and low-power operation capabilities.

[0035] Among them, the Real-Time Clock Module (RTC module) is an electronic module specifically designed to accurately record and maintain time information. It can continue to operate when the device is powered off or in a low-power state, providing a stable and accurate time reference for various electronic systems.

[0036] In an optional embodiment, the energy storage power supply 100 further includes a single-phase PFC converter and an LLC resonant converter.

[0037] A single-phase PFC converter transforms the AC input from the power grid and outputs it to the bus of the energy storage power source. The single-phase PFC converter can correct the input current waveform, making the current track the voltage phase, achieving PF≈1; at the same time, it boosts the pulsating DC to a stable high-voltage bus DC.

[0038] The bus is connected to the input terminal of the LLC resonant converter. The bus voltage serves as the voltage of the LLC resonant converter. The LLC resonant converter converts the input voltage to output voltage, which is then used by various components of the energy storage power supply.

[0039] The energy storage power supply 100 can communicate with the electronic device 200 to cooperate with the electronic device 200 to implement the ripple suppression method of this application.

[0040] Optionally, the electronic device 200 includes at least one of a terminal and a server.

[0041] The terminal may include, but is not limited to: smartphones (such as Android phones, iOS phones, etc.), tablet computers, laptops, desktop computers, smart speakers, smartwatches, portable personal computers, mobile internet devices (MIDs), smart voice interaction devices, smart home appliances, vehicle terminals, aircraft, wearable devices, etc., but this application embodiment does not limit the scope of the terminal.

[0042] The server can be a standalone physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDN (Content Delivery Network), and big data and artificial intelligence platforms. This application does not limit this.

[0043] The ripple suppression method of this application can be implemented by the energy storage power supply alone, or by the energy storage power supply in conjunction with electronic equipment, and there is no limitation on this.

[0044] It is understood that in the specific implementation of this application, user object data, context data and other related data are involved. When the embodiments of this application are applied to specific products or technologies, user permission or consent is required, and the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0045] Based on the above technical background and application scenarios, this application provides a ripple suppression method, which is described in detail below: Please see Figure 2 This application provides a ripple suppression method, which is implemented by steps 011 to 014, as described in detail below.

[0046] Step 011: Sample and obtain the output voltage; The output voltage refers to the voltage output by the target component that requires ripple suppression. For example, if voltage ripple exists in the output voltage of an LLC resonant converter, the output voltage of the LLC resonant converter can be sampled.

[0047] Step 012: Based on the output voltage and the preset multi-resonant PR controller, calculate multiple first control quantities, which correspond one-to-one with the frequency of each voltage ripple to be suppressed.

[0048] Among them, the Multiple Resonant Proportional-Resonant Controller (PR Controller) is a current / voltage tracking controller developed based on the traditional PR controller. Its core is to achieve zero steady-state error tracking of multi-frequency sinusoidal signals by introducing resonant elements at multiple specific frequency points. It is widely used in power electronic devices such as three-phase grid-connected inverters, active power filters (APF), and SVG.

[0049] The multi-resonant PR controller calculates the first control quantity corresponding to the frequency of the voltage ripple to be suppressed based on the output voltage of the LLC resonant converter and the preset reference voltage (generally the same as the reference voltage of the voltage loop of the energy storage power supply).

[0050] The multi-resonant PR controller achieves zero steady-state error control of the fundamental wave and multiple harmonics simultaneously by superimposing multiple resonant elements and aligning them with the fundamental wave and the harmonic frequencies to be suppressed (i.e., the frequencies of voltage ripple).

[0051] By calculating each voltage ripple to be suppressed, each first control quantity is calculated. Each first control quantity is used to generate a compensation waveform that is opposite to the waveform of the voltage ripple to be suppressed. After the positive and negative waveforms cancel each other out, ripple suppression is achieved.

[0052] Please see Figure 3 In an optional embodiment, step 012 involves calculating multiple first control quantities based on the output voltage and a preset multi-resonant PR controller, including: Step 0121: Based on the preset reference frequency, determine each target harmonic, where the frequency of the target harmonic is an even multiple of the reference frequency; Step 0122: Based on the output voltage, each target harmonic, and the multi-resonant PR controller, calculate the first control quantity corresponding to each target harmonic.

[0053] It is understandable that the voltage ripple in the output voltage of an LLC resonant converter is generally conducted from the PFC, which is typically connected to the power grid. Therefore, the frequency of the voltage ripple to be suppressed is generally an even multiple of the operating frequency of the power grid's input voltage, i.e., the reference frequency is the operating frequency of the power grid.

[0054] For example, the frequency of each voltage ripple to be suppressed (i.e. the frequency of the target harmonic) can be quickly determined based on an even multiple of a preset reference frequency.

[0055] Then, for each target harmonic to be suppressed, the output voltage and the multi-resonant PR controller can quickly calculate the first control quantity corresponding to each target harmonic, so as to achieve ripple suppression of each target harmonic.

[0056] For example, if the target harmonics include the 2nd, 4th, and 6th harmonics, then the corresponding first control quantity can be calculated for the 2nd, 4th, and 6th harmonics respectively.

[0057] It is understandable that PFCs typically incorporate a phase-locked loop (PLL) to lock the frequency and phase of the voltage. Therefore, when a PFC incorporates a PLL, the reference frequency is determined based on the frequency locked by the PLL.

[0058] In this way, by accurately determining the reference frequency and each target harmonic, the effectiveness of ripple suppression can be guaranteed.

[0059] Step 013: Calculate the third control quantity based on the first control quantity and the second control quantity output by the preset voltage loop.

[0060] In power electronic control systems (such as single-phase PFC, LLC resonant converters, inverters, etc.), the voltage loop is the outer loop control in the closed-loop control architecture. Its core objective is to stabilize the system's output voltage (or bus voltage) and ensure that the voltage remains near the set reference value when the load fluctuates or the grid is disturbed.

[0061] The voltage loop is usually combined with the current loop to form a cascaded dual-loop control (outer voltage loop + inner current loop). The outer loop determines the control accuracy and steady-state performance, while the inner loop ensures dynamic response and current limiting protection. The two have a clear division of labor.

[0062] The output voltage of the LLC resonant converter is controlled by a voltage loop, so that the output voltage of the LLC resonant converter is always near the preset reference voltage.

[0063] However, due to the voltage ripple in the output voltage of the LLC resonant converter, it is difficult to suppress the voltage ripple by using the second control quantity output from the voltage loop. Therefore, by combining the first and second control quantities calculated for the voltage ripple at each frequency, a third control quantity that can achieve voltage stability control and ripple suppression can be obtained.

[0064] For example, the third control quantity CtrlOutRect = V0Ctrl.Out + V0AddCtrl1.Out + V0AddCtrl2.Out + V0AddCtrl3.Out, where V0Ctrl.Out is the second control quantity output by the voltage loop, and V0AddCtrl1.Out, V0AddCtrl2.Out, and V0AddCtrl3.Out are the first control quantities corresponding to different target harmonics.

[0065] It is understandable that the above formula takes the target harmonics including the 2nd, 4th, and 6th harmonics as an example.

[0066] Step 014: Calculate the duty cycle of pulse width modulation based on the third control quantity.

[0067] Pulse Width Modulation (PWM) is a control technique that converts a constant amplitude DC voltage into a series of square wave pulses of equal amplitude but unequal width. Its core principle is to adjust the average output voltage or power by changing the pulse's duty cycle (the proportion of the high-level time to one cycle). For example, in an LLC resonant converter, PWM modulation is achieved by adjusting the duty cycle of the switching transistors.

[0068] Specifically, after calculating the third control quantity, the voltage loop can calculate the duty cycle of the resonant converter for pulse width adjustment based on the third control quantity, thereby controlling the corresponding switching transistors and enabling the resonant converter to achieve stable output voltage while suppressing ripple.

[0069] In one example, please combine Figure 4 and Figure 5 , Figure 4 The output voltage waveform before ripple suppression is shown, with an amplitude of 2.3. Figure 5 The output voltage waveform after second harmonic suppression for the ripple suppression method of this application has an amplitude of 1.3, which shows that the ripple suppression effect is quite obvious.

[0070] The ripple suppression method provided in this application obtains the real-time output voltage through sampling, and then uses a multi-resonant PR controller to calculate multiple first control quantities to suppress the voltage ripple of the output voltage. The number of first control quantities is determined by the number of ripple frequencies to be suppressed. Then, the multiple first control quantities are superimposed on the second control quantity output by the voltage loop, thereby generating a compensation waveform that is opposite to the ripple waveform when the voltage loop implements voltage control, achieving ripple suppression, and simultaneously suppressing ripple at multiple frequencies. Furthermore, this application eliminates the need to increase the filter capacitor, reducing hardware costs and system failure rate.

[0071] Please refer to it again. Figure 3 In some embodiments, the ripple suppression method further includes: Step 015: Sample the output current; Step 016: Determine the fourth control quantity based on the output current and the preset reference current of the current loop; Step 017: Update the preset reference voltage of the voltage loop based on the fourth control quantity.

[0072] It is understandable that the voltage loop generally works in conjunction with the current loop. However, the stress on the switching transistors of an LLC resonant converter is limited. If the output voltage is too high, the output current will also become too high, resulting in excessive stress on the switching transistors, which will affect the lifespan of the switching transistors or even damage them.

[0073] Therefore, output voltage control needs to be based on the current loop.

[0074] The output current of the LLC resonant converter can be sampled first, and then the magnitude of the output current and the preset reference current of the current loop (generally based on the stress adaptability setting of the switching transistor) can be compared to determine the fourth control quantity.

[0075] Finally, the preset reference voltage of the voltage loop is updated based on the fourth control quantity to adjust the output voltage of the LLC resonant converter.

[0076] In one optional embodiment, when the output current is greater than a preset reference current, the fourth control quantity is determined as a lower current control quantity, which is determined based on the second control quantity; when the output current is less than or equal to the preset reference current, the fourth control quantity is determined as a higher current control quantity, which is less than the higher current control quantity.

[0077] In other words, when the output current exceeds the limit (i.e., the output current is greater than the preset reference current), the preset reference voltage can be reduced. At this time, the reduced preset reference voltage can be obtained by adding the preset reference voltage and the current lower limit control value (usually a negative value). When the output current does not exceed the limit, the preset reference voltage can be slightly adjusted or not adjusted at all, such as setting the current upper limit control value to 0 or setting it to be larger than the current lower limit control value.

[0078] For example, the lower current limit control quantity I0Ctrl.Min = 1 - V0Cmd.Out, and the upper current limit control quantity I0Ctrl.Max = 0, where V0Cmd.Out is the second control quantity.

[0079] For example, the preset reference current V0CtrlRef = V0CtrlRef' + I0Ctrl.Out, where V0CtrlRef is the updated preset reference voltage (the initial value is generally the charging reference voltage requested by the battery), and V0CtrlRef' is the preset reference voltage before the update.

[0080] This application also provides a ripple suppression device 300 for performing the steps described above in the ripple suppression method. See also... Figure 6 , Figure 6 This is a schematic diagram of a ripple suppression device 300 provided in an embodiment of this application. The ripple suppression device 300 includes: Sampling module 301 is used to sample and obtain the output voltage; The first calculation module 302 is used to calculate multiple first control quantities based on the output voltage and a preset multi-resonant PR controller. The first control quantities correspond one-to-one with the frequency of each voltage ripple to be suppressed. The second calculation module 303 calculates the third control quantity based on the first control quantity and the second control quantity output by the preset voltage loop; The third calculation module 304 calculates the duty cycle of pulse width modulation based on the third control quantity.

[0081] It should be noted that the specific details of each module unit in the above-mentioned ripple suppression device 300 have been described in detail in the embodiments of the above-mentioned ripple suppression method, and will not be repeated here.

[0082] In the embodiments of this application, the terms "module" or "unit" refer to a computer program or part of a computer program that has a predetermined function and works with other related parts to achieve a predetermined goal, and can be implemented wholly or partially using software, hardware (such as processing circuitry or memory), or a combination thereof. Similarly, a processor (or multiple processors or memory) can be used to implement one or more modules or units. Furthermore, each module or unit can be part of an overall module or unit that includes the functionality of that module or unit.

[0083] In some embodiments, the ripple suppression device in this application can be implemented in hardware, such as an energy storage power supply or a component in the energy storage power supply, such as an integrated circuit or a chip; the ripple suppression device can also be implemented in software, such as as an application installed in a terminal or energy storage power supply.

[0084] In some embodiments, the energy storage power supply includes a main control board, a charging interface, and a battery. The main control board includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the various processes described above in the embodiments of the ripple suppression method and achieves the same technical effect. To avoid repetition, these will not be repeated here.

[0085] In some embodiments, the electronic device includes a processor and a memory. The memory stores a computer program that can run on the processor. When executed by the processor, the program implements the various processes described above in the embodiments of the ripple suppression method and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0086] This application also provides a non-transitory computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the various processes of the above-described ripple suppression method embodiments and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0087] The processor can be the processor in the energy storage power supply of the above embodiments. The computer-readable storage medium can be a computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc.

[0088] Computer-readable media can include computer storage media and communication media. Computer storage media includes volatile and non-volatile, removable and non-removable media implemented using any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media include RAM, ROM, erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other solid-state storage technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape cassettes, magnetic tape, disk storage, or other magnetic storage devices. Of course, those skilled in the art will recognize that computer storage media are not limited to the above-mentioned types.

[0089] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described ripple suppression method. The processor may be the processor in the energy storage power supply described in the above embodiments. When the computer program is executed by the processor, it implements the various processes of the embodiments of the above-described ripple suppression method and achieves the same technical effects; therefore, to avoid repetition, it will not be described again here.

[0090] It is understood that in the specific implementation of this application, data related to user identity or characteristics is involved. When the above embodiments of this application are applied to specific products or technologies, user permission or consent is required, and the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0091] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A ripple suppression method, characterized in that, include: The output voltage is obtained by sampling; Based on the output voltage and the preset multi-resonant PR controller, multiple first control quantities are calculated, and the first control quantities correspond one-to-one with the frequency of each voltage ripple to be suppressed. Calculate the third control quantity based on the first control quantity and the second control quantity output by the preset voltage loop; The duty cycle of pulse width modulation is calculated based on the third control quantity.

2. The ripple suppression method according to claim 1, characterized in that, Based on the output voltage and a preset multi-resonant PR controller, the system calculates multiple first control quantities, including: Based on the frequency of each ripple to be suppressed and a preset reference frequency, each target harmonic is determined, wherein the frequency corresponding to the target harmonic is an even multiple of the reference frequency. Based on the output voltage, each of the target harmonics, and the multi-resonant PR controller, the first control quantity corresponding to each of the target harmonics is calculated.

3. The ripple suppression method according to claim 2, characterized in that, The target harmonics include the 2nd harmonic, the 4th harmonic, and the 6th harmonic; the calculation of the first control quantity corresponding to each target harmonic based on the output voltage, each target harmonic, and the multi-resonant PR controller includes: Based on the output voltage, each of the target harmonics, and the multi-resonant PR controller, the first control quantity corresponding to the 2nd, 4th, and 6th harmonics is calculated.

4. The ripple suppression method according to claim 2 or 3, characterized in that, The preset reference frequency is determined based on the frequency of the input voltage or the frequency of the input voltage locked by a phase-locked loop.

5. The ripple suppression method according to claim 1, characterized in that, Also includes: The output current is obtained by sampling; Based on the output current and the preset reference current of the current loop, a fourth control quantity is determined; The preset reference voltage of the voltage loop is updated based on the fourth control quantity.

6. The ripple suppression method according to claim 5, characterized in that, The determination of the fourth control quantity based on the output current and the preset reference current of the current loop includes: When the output current is greater than the preset reference current, the fourth control quantity is determined to be the current lower limit control quantity, which is determined based on the second control quantity. When the output current is less than or equal to the preset reference current, the fourth control quantity is determined to be the upper limit current control quantity, and the lower limit current control quantity is less than the upper limit current control quantity.

7. The ripple suppression method according to claim 5, characterized in that, The current upper limit control value is 0.

8. An energy storage power source, characterized in that, The device includes a main control board, a charging interface, and a battery. The main control board includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the method as described in any one of claims 1-7.

9. The energy storage power supply according to claim 8, characterized in that, The energy storage power supply also includes a single-phase PFC converter and an LLC resonant converter. The single-phase PFC converter converts the AC input from the power grid and outputs it to the bus of the energy storage power supply. The bus voltage is input to the LLC resonant converter, which performs voltage conversion on the input voltage to output the output voltage.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1-7.

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