DC bus voltage supporting method based on super capacitor assistance

Abstract

The invention discloses a DC bus voltage supporting method based on super capacitor assistance, and the method employs a charging module which is used for charging a super capacitor module, supporting current limiting and constant voltage, preventing the damage to a super capacitor in a charging process, and guaranteeing the stability of a charging function; the super capacitor module is used for storing electric energy, and the stored electric energy is used for discharging output of the whole system; the voltage boosting and reducing module is used for detecting the voltage output by the super capacitor and boosting or reducing the voltage; the constant voltage module is used for carrying out constant voltage processing on the voltage output by the voltage boosting and reducing module; the anti-reverse protection module is used for preventing reverse input of the voltage; the main control module is a core logic processing unit of the whole system; and the bus voltage detection module is used for detecting a bus voltage state and directly sending the bus voltage state to the main control module, and is used for judging whether the system has an action condition or not. According to the invention, the problem of DC bus voltage loss caused by open circuit of the storage battery can be solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power DC bus, and particularly relates to a DC bus voltage support method based on super capacitor assistance. BACKGROUND

[0002] The power station, power plant and data center machine room adopt a DC system to provide power supply for control, protection and automatic system devices, which is an independent power supply. In normal operation, the charging system bears the frequent load and charges the battery pack to compensate for the self-discharge of the battery pack, so that the battery pack is in a full-capacity state for standby. In the case of AC interruption, the battery pack continues to provide DC power supply to the load, which can guarantee the normal work of the protection, control and braking system. When the battery pack is open-circuited, the battery outlet protection electric appliance or isolation electric appliance is disconnected, the battery pack is disconnected from the bus operation, and in the case of AC power failure, the entire system cannot output DC power supply, resulting in DC bus voltage loss, which leads to the failure of the DC load to work normally, causing signal interruption, protection refusal and other accidents.

[0003] In order to solve the above problems, the application provides a DC bus voltage support method based on super capacitor assistance to solve the problem of DC bus voltage loss caused by open circuit of the battery. SUMMARY

[0004] In order to solve the defects and deficiencies in the prior art, the application provides a DC bus voltage support method based on super capacitor assistance, which can provide reserve power for the DC system instead of the battery to supply power when the battery is open-circuited, the battery outlet protection electric appliance or isolation electric appliance is disconnected, prevent DC bus voltage loss, ensure the continuous normal work of the DC load, timely eliminate the fault of AC power failure, prevent signal interruption and protection refusal, and ensure the stability and safety of the entire system.

[0005] The application provides the following technical scheme: a DC bus voltage support method based on super capacitor assistance, which adopts: A charging module: used for charging the super capacitor module, supporting current limiting and constant voltage, preventing damage to the super capacitor during charging, and ensuring the stability of the charging function; A super capacitor module: used for storing electric energy, and the stored electric energy is used for discharging output of the entire system; A boost-buck module: used for detecting the voltage output by the super capacitor and performing voltage boosting or bucking; A constant voltage module: used for constant voltage processing of the voltage output by the boost-buck module; A reverse protection module: used for preventing reverse voltage input; A main control module: a core logic processing unit of the entire system; Bus voltage detection module: for detecting bus voltage state and directly sent to the main control module, for judging whether the system has the action condition.

[0006] The method of the application is that the power of the DC bus voltage is derived from the super capacitor, and the charging of the super capacitor depends on the input charging of the AC circuit. Since the DC bus and the battery output are in parallel, when the anti-reverse circuit is not set in the method of the application, the battery will charge the super capacitor, resulting in impact on the battery.

[0007] Preferably, the charging module is an AC charging module with DC output, which is connected to an AC 220V power supply. The charging module comprises a rectifier circuit, a constant voltage circuit and a current limiting circuit.

[0008] Preferably, the super capacitor module is the power storage component of the whole system, which comprises single super capacitors and electronic components. The super capacitor module is composed of a plurality of 3.0V 360F single super capacitors connected in series and integrated by a voltage equalization circuit. The charging module charges the super capacitor by constant voltage output. After a certain period of time, the super capacitor is fully charged.

[0009] Preferably, the boost and buck module comprises a detection circuit, a boost circuit and a buck circuit. The voltage output by the super capacitor is detected by the detection circuit. When the voltage value is lower than the preset value, the boost circuit is used for boosting. When the voltage value is higher than the preset value, the buck circuit is used for bucking.

[0010] Preferably, the constant voltage module comprises a voltage stabilizing electronic component, which is a subordinate component of the boost and buck module. The constant voltage module is used to ensure that the output voltage of the whole system is constant, so that the voltage of the DC bus in the actual application of the system meets the needs of the load.

[0011] Preferably, the main control module comprises a set of main control logic processing electronic components, which are used to determine the state of the electrical signals detected by the system and provide action instructions for the output action of the device.

[0012] Preferably, the bus voltage detection module comprises a set of electronic components for measuring the voltage state of the DC bus connected in parallel with the output terminal.

[0013] Compared with the prior art, the application has the following beneficial effects: The application can provide reserve power for the DC system to replace the battery to supply power when the battery is open-circuited, the battery outlet protection appliance or the isolation appliance is disconnected, prevent the DC bus from losing voltage, ensure the continuous normal work of the DC load, timely eliminate the fault of AC power failure, prevent the occurrence of signal interruption and protection refusal, and ensure the stability and safety of the whole system. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 This is a system framework diagram of the present invention. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] like Figure 1 As shown, a method for supporting DC bus voltage based on supercapacitor assistance is described, which employs a charging module, a supercapacitor module, a step-up / step-down module, a constant voltage module, a reverse protection module, a main control module, and a bus voltage detection module.

[0017] The charging module is an AC charging module with DC output. The system is used to connect to an AC220V power supply and includes a rectifier circuit, a constant voltage circuit, and a current limiting circuit for charging the supercapacitor module. The charging module supports current limiting and constant voltage to prevent damage to the supercapacitor during charging and ensure the stability of the charging function.

[0018] The supercapacitor module is the energy storage system for the entire system, comprising individual supercapacitors and electronic components. It consists of multiple 3.0V 360F individual supercapacitors connected in series and integrated together via a voltage equalization circuit. The charging module charges the supercapacitors with a constant voltage output, fully charging them after a specified time. The stored energy is used for the system's discharge output.

[0019] The buck-boost module includes a detection circuit, a boost circuit, and a buck circuit. The module detects the voltage output from the supercapacitor through the detection circuit. By comparing this voltage value with a preset voltage value, if the voltage value is lower than the preset value, the boost circuit is used to boost the voltage; if the voltage value is higher than the preset value, the buck circuit is used to reduce the voltage.

[0020] The constant voltage module includes a voltage-regulating electronic board and is a downstream component of the buck-boost module. The constant voltage module is used to maintain a constant voltage output from the buck-boost module, ensuring a constant output voltage for the entire system and enabling the system to meet load requirements for the DC bus voltage in practical applications.

[0021] The reverse voltage protection module is used to prevent reverse voltage input. In this method, the electrical energy supported by the DC bus voltage comes from the supercapacitor, which is charged by the input charging of the AC circuit. Since the DC bus and the battery pack output are connected in parallel, when this method does not include a reverse voltage protection circuit, the battery will charge the supercapacitor, causing an impact on the battery.

[0022] The main control module includes a set of main control logic processing electronic boards. This module is the core logic processing unit of the entire system, which is responsible for determining the electrical signal status detected by the system and providing action instructions for the output actions of the equipment.

[0023] The bus voltage detection module includes an electronic board for measuring the DC bus voltage status connected in parallel with the output terminal. The bus voltage status detected by the system is directly sent to the main control module to determine whether the system meets the operating conditions. Example

[0024] Specific Case 1: Example

[0025] Specific Case 2: Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for supporting DC bus voltage based on supercapacitor assistance, characterized in that, The DC bus voltage support method adopts: Charging module: Used to charge the supercapacitor module, it supports current limiting and constant voltage to prevent damage to the supercapacitor during charging and ensure the stability of the charging function; Supercapacitor module: Used for energy storage, and the stored energy is used for the discharge output of the entire system; Buck-boost module: Used to detect the voltage output by the supercapacitor and boost or buck the voltage. Constant voltage module: Used to maintain a constant voltage output from the buck-boost module; Reverse voltage protection module: Used to prevent reverse voltage input; Main control module: the core logic processing unit of the entire system; Bus voltage detection module: Used to detect the bus voltage status and send it directly to the main control module to determine whether the system has the conditions to operate.

2. The method for supporting DC bus voltage based on supercapacitor assistance according to claim 1, characterized in that, The charging module is an AC charging module with DC output, used to connect to an AC220V power supply. The charging module includes a rectifier circuit, a constant voltage circuit, and a current limiting circuit.

3. The method for supporting DC bus voltage based on supercapacitor assistance according to claim 2, characterized in that, The supercapacitor module is the energy storage component of the entire system. It includes individual supercapacitors and electronic boards. It is composed of multiple 3.0V 360F individual supercapacitors connected in series and integrated together through a voltage equalization circuit. The charging module charges the supercapacitors with a constant voltage output voltage, and the charge is fully charged after a certain period of time.

4. The method for supporting DC bus voltage based on supercapacitor assistance according to claim 1, characterized in that, The step-up / step-down module includes a detection circuit, a step-up circuit, and a step-down circuit. The detection circuit detects the voltage output by the supercapacitor and compares the voltage value with a preset voltage value. When the voltage value is lower than the preset value, the step-up circuit is used to increase the voltage; when the voltage value is higher than the preset value, the step-down circuit is used to decrease the voltage.

5. A method for supporting DC bus voltage based on supercapacitor assistance according to claim 1, characterized in that, The constant voltage module includes a voltage-stabilizing electronic board, which is a lower-level component of the buck-boost module. It is used to ensure that the output voltage of the entire system is constant, so that the voltage of the DC bus meets the load requirements in practical applications.

6. A method for supporting DC bus voltage based on supercapacitor assistance according to claim 5, characterized in that, The main control module includes a set of main control logic processing electronic boards, which are used to determine the electrical signal status detected by the system and to provide action commands for the output actions of the equipment.

7. A method for supporting DC bus voltage based on supercapacitor assistance according to claim 1, characterized in that, The bus voltage detection module includes an electronic board for measuring the DC bus voltage status connected in parallel with the output terminal.

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