A fluctuating load advance active compensation system

Abstract

The present application relates to a kind of fluctuation load advance active compensation system, including front-end industrial computer, load controller and the power supply for load power supply;Wherein, front-end industrial computer and user interaction, identify user demand and determine corresponding working mode, and issue working mode instruction to load controller;Load controller identifies the working mode instruction sent by front end, then before controlling high-energy load sudden increase, first provide the compensation parameter corresponding to working mode to power supply;Power supply after receiving the compensation parameter of load controller, advance to high-energy load power shortage is compensated for.This application can not join additional power circuit under the premise, using the compensation algorithm based on load controller, control the power circuit of load power supply itself, active power compensation is carried out to fluctuation load before power shortage appears.Thereby, while reaching better effect than passive compensation, system capacitive device is greatly saved, and it is favorable to the light weight and low cost of fluctuation load system.

Description

Technical Field

[0001] This invention relates to the field of switching power supplies, and more particularly to a fluctuating load lead active compensation system. Background Technology

[0002] Fluctuating loads, primarily in the form of motor starting and detection pulses, are widely present in industry. The power link of a fluctuating load system mainly consists of a front-end industrial control computer, a load controller, and a load power supply. The front-end industrial control computer determines the operating mode of the fluctuating load through user interaction and related calculations; after receiving the operating mode command, the load controller controls the sudden increase and decrease of the fluctuating load; the load power supply is mainly used to provide power support to the fluctuating load.

[0003] Fluctuating loads are characterized by rapid changes, high power, and short duration. The output power of the load power supply is primarily controlled by the output voltage; the power supply only increases its output power when the output voltage drops. This results in a power response lag of approximately 30µs compared to the fluctuating load demand. This lag leads to a power deficit in the load power supply relative to the fluctuating load's power requirement. Severe power deficits can cause insufficient pulse power, preventing the motor from starting normally.

[0004] To compensate for power deficits, existing solutions typically employ passive compensation, which involves connecting several large-capacity capacitors in parallel at the output of the load power supply, allowing the power deficit to be compensated by the discharge of these capacitors. However, this passive compensation method significantly increases the cost and size of the load power supply, reducing the overall power density of the fluctuating load system and hindering the market demand for low-cost, lightweight fluctuating load systems. Therefore, finding a way to compensate for power deficits without increasing the cost and size of the load power supply has become a key challenge in the research and development of low-cost, lightweight fluctuating load systems. Summary of the Invention

[0005] To address the existing technical problems, this invention provides a fluctuating load lead active compensation system.

[0006] The specific content of this invention is as follows: A fluctuating load proactive active compensation system, wherein the hardware circuit used in the fluctuating load proactive active compensation system includes a front-end industrial control computer (hereinafter referred to as the front-end), a load controller, and a load power supply (hereinafter referred to as the power supply). The main function of the front-end is to interact with the user, identify user needs, determine the corresponding operating mode, and send the operating mode command to the load controller. The main function of the load controller is to identify the operating mode command issued by the front-end, and then, before controlling a sudden increase in high-energy load, provide the power supply with compensation parameters corresponding to the operating mode. The main function of the power supply is to, after receiving the compensation parameters from the load controller, proactively compensate for the power deficit of the high-energy load, thereby avoiding the power deficit caused by power supply power response lag.

[0007] In fluctuating load lead-advanced active compensation systems, the highly integrated circuit interconnection used is mainly the integrated design of the load controller and power supply. This not only improves the integration of hardware interconnection but also reduces the possibility of communication interference in complex electromagnetic environments. The circuit interconnection structure involves the front-end industrial control computer being connected to this integrated design via fiber optic or cable, while the load controller and load power supply are integrated designs with board-level interconnection.

[0008] In a fluctuating load lead-based active compensation system, high-reliability data interconnection is used. Communication between the load controller and the front-end is only in operating mode, using Ethernet or fiber optic communication. Furthermore, the load controller has a built-in operating mode interlock after a communication failure, thus improving the fault tolerance of the data interconnection. The integrated design of the load controller and power supply ensures minimal electromagnetic interference at the PCB level. Therefore, the main communication data is concentrated between the load controller and the power supply, using a communication protocol compatible with the power supply.

[0009] In the active compensation system for fluctuating load, the advanced compensation model and related parameter calculation methods are used. An advanced compensation model is established, and the advanced compensation parameters are calculated using the model. Then, the power supply reference DC voltage fluctuation is controlled to achieve active compensation for fluctuating load power fluctuation. The advanced compensation model and parameter calculation methods are as follows.

[0010] The load controller establishes a proactive compensation model, and calculates the proactive compensation parameters using this model. The proactive compensation model is as follows:

[0011] The input is the reference voltage VREF of the voltage loop controller, which is then processed by the voltage controller. The gain coefficient g of the voltage loop output to the inductor current m 1 / Cs, where Cs is the compensation capacitor. For fluctuating load pulses, the output voltage VOUT is...

[0012] The calculation method for the advance compensation parameter X is as follows:

[0013] .

[0014] In the active compensation system for fluctuating load advance, the advance compensation parameter discretization algorithm is used. Taking into account the power communication rate and power calculation frequency, an appropriate discretization time is selected to process the advance compensation parameters and obtain the discretized advance compensation parameters that can be used in practice. The discretization algorithm is as follows.

[0015]

[0016] in, This refers to the proportional element coefficient of the load controller. Here, is the coefficient of the integral element of the controller, and s is the differential operator;

[0017]

[0018] Where t is the current time, For the processing steps after discretization, For the controller output,

[0019] .

[0020] In a fluctuating load lead-advanced active compensation system, a highly efficient and reliable load controller is used. The load controller's memory contains pre-calculated compensation parameters corresponding to the operating mode. After recognizing the operating mode command, the load controller provides the compensation parameters to the power supply via a lookup table, avoiding extensive real-time calculations, saving controller resources, and reliably ensuring the correspondence between compensation parameters and the operating mode. The load controller resource configuration is as follows:

[0021] The load controller includes an FPGA chip, which has SPI interface, I2C interface, Ethernet interface, I / O and spare interface. It is connected to the crystal oscillator, WATCH DOG, FLASH PRAM chip, and PWM through optocoupler isolation, and is also connected to optical fiber.

[0022] In a fluctuating load lead active compensation system, the passive parameter optimization method used, after applying active lead compensation, uses the fluctuating load withstand voltage, power supply stability, power density requirements, and cost constraints as boundary conditions to derive the minimum system parameters for passive capacitive devices. This reduces the manufacturing cost of the fluctuating load system and increases its power density. The passive parameter optimization method is as follows:

[0023] The passive parameter optimization method is as follows:

[0024] Under the condition that the maximum withstand voltage Umax is not exceeded, i.e. , Minimum compensation capacitance under this condition The output voltage in steady state. The delay time of fluctuating load relative to the leading active compensation control;

[0025] Under the condition of ensuring the stability of the power supply loop, i.e. , Minimum compensation capacitance under this condition This is the controller cutoff frequency;

[0026] Under the constraint of system power density on capacitor volume, i.e. , The maximum value of the compensation capacitor under this condition. This represents the maximum value that can be placed under the actual circuit volume constraints;

[0027] Under the constraint of cost on capacitor size, i.e. , The maximum value of the compensation capacitor under this condition. This represents the maximum value that can be placed under the actual circuit cost constraints;

[0028] Maximum required compensation capacitor capacity Minimum required compensation capacitor capacity .

[0029] The beneficial effects of this invention are as follows: The fluctuating load advance active compensation system provided by this invention can, without adding additional power circuits, utilize a compensation algorithm based on a load controller to control the power circuit of the load power supply itself, and perform active power compensation for fluctuating loads before power deficits occur. This achieves better results than passive compensation while significantly reducing the number of capacitive components in the system, thus contributing to the lightweight and low-cost design of fluctuating load systems. Attached Figure Description

[0030] The specific embodiments of the present invention will be further explained below with reference to the accompanying drawings.

[0031] Figure 1 This is a schematic diagram of the system hardware composition and circuit interconnection of the present invention;

[0032] Figure 2 This is a schematic diagram of the system information flow and data interconnection relationship of the present invention;

[0033] Figure 3 A schematic diagram of the system's advance compensation model and parameter calculation method;

[0034] Figure 4 A schematic diagram of the discretization processing method for system advance compensation parameters;

[0035] Figure 5 A schematic diagram of load controller resource configuration;

[0036] Figure 6 Flowchart of the method for optimizing passive parameters of the system. Detailed Implementation

[0037] Combination Figures 1-6 The fluctuating load lead active compensation system of the present invention includes the following steps:

[0038] Step S1: According to Figure 1 The interconnections shown connect the various hardware components.

[0039] The communication data between the load controller and the front end is only in working mode, using network port or fiber optic communication; the communication between the load controller and the load power supply adopts an integrated circuit design, which not only improves the integration of hardware interconnection, but also reduces the possibility of communication interference in complex electromagnetic environments, ensuring minimal electromagnetic interference at the PCB level.

[0040] Step S2: According to Figure 2 The interconnections shown indicate how to write communication data between the various hardware components.

[0041] The communication data between the load controller and the front end is only in the working mode, which reduces the interference of the environment on the cable or optical cable, and the load controller has built-in disconnection lockout protection; the main communication data is concentrated between the load controller and the power supply.

[0042] Step S3: According to Figure 3 The system advance compensation model and parameter calculation method shown calculate the compensation parameters. The core principle is to use the load controller to generate fluctuations in the reference direct voltage, thereby compensating for fluctuations in load power.

[0043] The load controller establishes a proactive compensation model, and calculates the proactive compensation parameters using this model. The proactive compensation model is as follows:

[0044] The input is the reference voltage VREF of the voltage loop controller, which is then processed by the voltage controller. The gain coefficient g of the voltage loop output to the inductor current m 1 / Cs, where Cs is the compensation capacitor. For fluctuating load pulses, the output voltage VOUT is...

[0045] The calculation method for the advance compensation parameter X is as follows:

[0046] .

[0047] Step S4: According to Figure 4The algorithm for discretizing the advanced compensation parameters shown discretizes the compensation parameters and performs a single-integration discretization of the advanced compensation model based on the internal calculation frequency of the power supply, thereby obtaining compensation parameters that can be used in practice.

[0048] The discretization algorithm is as follows;

[0049]

[0050] in, This refers to the proportional element coefficient of the load controller. Here, is the coefficient of the integral element of the controller, and s is the differential operator;

[0051]

[0052] Where t is the current time, For the processing steps after discretization, For the controller output,

[0053] .

[0054] Step S5: According to Figure 5 The load controller resource configuration shown writes the discretized compensation parameters corresponding to the operating mode into the load controller's memory. This allows the load controller to provide the compensation parameters to the power supply via a lookup table, avoiding extensive real-time calculations and saving controller resources.

[0055] The load controller includes an FPGA chip, which has SPI interface, I2C interface, Ethernet interface, I / O and spare interface. It is connected to the crystal oscillator, WATCH DOG, FLASH PRAM chip, and PWM through optocoupler isolation, and is also connected to optical fiber.

[0056] Step S6: According to Figure 6 The system passive parameter optimization method shown calculates the minimum system parameters for passive capacitive devices using the fluctuation load withstand voltage, power supply stability, power density requirements, and cost constraints as boundary conditions, thereby achieving a high power density and low cost power deficit compensation scheme.

[0057] The passive parameter optimization method is as follows:

[0058] Under the condition that the maximum withstand voltage Umax is not exceeded, i.e. , Minimum compensation capacitance under this condition The output voltage in steady state. The delay time of fluctuating load relative to the leading active compensation control;

[0059] Under the condition of ensuring the stability of the power supply loop, i.e. , Minimum compensation capacitance under this condition This is the controller cutoff frequency;

[0060] Under the constraint of system power density on capacitor volume, i.e. , The maximum value of the compensation capacitor under this condition. This represents the maximum value that can be placed under the actual circuit volume constraints;

[0061] Under the constraint of cost on capacitor size, i.e. , The maximum value of the compensation capacitor under this condition. This represents the maximum value that can be placed under the actual circuit cost constraints;

[0062] Maximum required compensation capacitor capacity Minimum required compensation capacitor capacity .

[0063] This invention avoids the significant increase in cost and size of the load power supply caused by passive compensation for fluctuating load power deficit, and proposes a fluctuating load proactive active compensation system. Proactive active compensation achieves better power deficit compensation than passive compensation while also greatly reducing the need for large-capacity capacitive components required by passive compensation, decreasing the size of the load power supply, and increasing the power density of the fluctuating load system. This significantly promotes the lightweighting and cost reduction of related products for fluctuating load systems.

[0064] Many specific details have been set forth in the foregoing description to provide a thorough understanding of the present invention. However, the above description is merely a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A fluctuating load lead active compensation system, characterized in that: This includes the front-end industrial control computer, load controller, and power supply for the load; Among them, the front-end industrial control computer interacts with the user, identifies the user's needs and determines the corresponding working mode, and sends the working mode instruction to the load controller; The load controller identifies the operating mode command issued by the front end, and then provides the power supply with compensation parameters corresponding to the operating mode before controlling the sudden increase in fluctuating load; After receiving the compensation parameters from the load controller, the power supply proactively compensates for the power deficit of fluctuating loads. The load controller establishes a proactive compensation model, and calculates the proactive compensation parameters using this model. The proactive compensation model is as follows: The input is the reference voltage VREF of the voltage loop controller, which is then processed by the voltage controller. The gain coefficient g of the voltage loop output to the inductor current m And 1 / Cs, the output voltage VOUT, Cs is the compensation capacitor, For fluctuating load pulses, The calculation method for the advance compensation parameter X is as follows: ； Considering the power communication rate and power calculation frequency, a suitable discrete time is selected to process the lead compensation parameters, resulting in practically usable discretized lead compensation parameters. The discretization algorithm is as follows: ， in, This refers to the proportional element coefficient of the load controller. Here, is the coefficient of the integral element of the controller, and s is the differential operator; Where t is the current time, For the processing steps after discretization, For the controller output, 。 2. The active compensation system for fluctuating load advance according to claim 1, characterized in that: The load controller and power supply are integrated into one design.

3. The active compensation system for fluctuating load advance according to claim 1, characterized in that: The communication data between the load controller and the front-end industrial control computer is in working mode, using network port or fiber optic communication, and the load controller has a built-in working mode interlock after the communication between the load controller and the front-end is disconnected.

4. The active compensation system for fluctuating load advance according to claim 1, characterized in that: The pre-calculated compensation parameters corresponding to the operating mode are written into the memory. After recognizing the operating mode command, the load controller provides the compensation parameters to the power supply through a lookup table method.

5. The active compensation system for fluctuating load advance according to claim 4, characterized in that: The load controller includes an FPGA chip, which has SPI interface, I2C interface, Ethernet interface, I / O and spare interface. It is connected to a crystal oscillator, WATCHDOG, FLASH PRAM chip, and is also connected to a PWM module through optocoupler isolation and optical fiber.

6. The active compensation system for fluctuating load advance according to claim 1, characterized in that: After using active lead compensation, the minimum system parameters for passive capacitive devices are obtained by taking the fluctuation load withstand voltage, power supply stability, power density requirements and cost constraints as boundary conditions.

7. The active compensation system for fluctuating load advance according to claim 6, characterized in that: The passive parameter optimization method is as follows: Under the condition that the maximum withstand voltage Umax is not exceeded, i.e. , Minimum compensation capacitance under this condition The output voltage in steady state. The delay time of fluctuating load relative to the leading active compensation control; Under the condition of ensuring the stability of the power supply loop, that is , Minimum compensation capacitance under this condition This is the controller cutoff frequency; Under the constraint of system power density on capacitor volume, i.e. , The maximum value of the compensation capacitor under this condition. This represents the maximum value that can be placed under the actual circuit volume constraints; Under the constraint of cost on capacitor size, i.e. , The maximum value of the compensation capacitor under this condition. This represents the maximum value that can be placed under the actual circuit cost constraints; Maximum required compensation capacitor capacity ; Minimum required compensation capacitor capacity .

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