Power distribution room DC power supply system based on buck-boost module control

Abstract

The invention belongs to the technical field of training simulation, discloses a power distribution room direct-current power supply system based on buck-boost module control, and aims to provide stable direct-current voltage output to a load, supply power to the load after the commercial power is rectified, and charge a storage battery after accurate control voltage reduction of the buck-boost module through PWM (Pulse Width Modulation)-based signal processing. When the mains supply does not supply power or the mains supply is unstable, the storage battery is switched to supply power to the load through the control module, and the output voltage is boosted to supply power to the load according to the power supply voltage of the load and accurate control of the voltage boosting and reducing module based on PWM signal processing, so that the stability and the reliability of power supply are ensured, and the change of different load and voltage requirements is adapted.

Description

Technical Field

[0001] The invention belongs to the technical field of training simulation, and in particular relates to a DC power supply system for a power distribution room based on buck-boost module control. Background Art

[0002] With the rapid development of power electronics technology, DC power supply systems are increasingly used in power distribution rooms. However, traditional DC power supply systems often have problems such as limited voltage regulation range, slow response speed, and low efficiency, which makes it difficult to meet the high requirements of modern power distribution rooms for power quality and power supply reliability.

[0003] Most of the existing DC power supply systems in distribution rooms cannot monitor the mains power, provide uninterrupted power supply to the load when the mains power fluctuates or cannot be supplied, and can also output a stable constant voltage to meet the load power supply needs. Therefore, it is particularly important to develop a DC power supply system that can automatically adjust the voltage, improve power supply efficiency, and enhance system stability. Summary of the invention

[0004] The object of the present invention is to provide a DC power supply system for a power distribution room based on buck-boost module control, so as to solve the problems faced in the above-mentioned background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A DC power supply system for a power distribution room based on buck-boost module control, the system comprising a rectifier module, an energy storage module, a buck-boost module, a load interface and an intelligent control unit;

[0007] The rectifier module is connected to the mains terminal and is used to convert AC power into DC power to supply power to the load;

[0008] The buck-boost module is used to adjust the output voltage according to the PWM signal to achieve a boost or buck function;

[0009] The energy storage module includes a plurality of storage batteries, which are used to provide temporary power support when the power grid is abnormal;

[0010] The monitoring module is used to monitor the operating status of the system in real time and send a control signal corresponding to the monitoring result to the control module through the communication module;

[0011] The control module is used to send the corresponding PWM signal to the buck-boost module according to the control signal of the communication module.

[0012] As a further description of the solution of the present invention, the buck-boost module includes at least one buck-boost unit;

[0013] One of the buck-boost units includes a resistor R1, a MOS tube Q1, and a MOS tube Q2. The G pole of the MOS tube Q1 is externally connected to a PWM1 control signal, the G pole of the MOS tube Q2 is externally connected to a PWM2 control signal, and the D pole of the MOS tube Q1 is connected to the S pole of the MOS tube Q2.

[0014] As a further description of the scheme of the present invention, when the buck-boost unit is set to two, the other buck-boost unit includes a resistor R2, a MOS tube Q3, and a MOS tube Q4, the G pole of the MOS tube Q3 is externally connected to the PWM3 control signal, the G pole of the MOS tube Q4 is externally connected to the PWM4 control signal, and the D pole of the MOS tube Q3 is connected to the S pole of the MOS tube Q4.

[0015] As a further description of the solution of the present invention, the monitoring module is used to monitor the input voltage and output voltage parameters in real time, and feed back the input voltage and output voltage parameters to the control module;

[0016] The input voltage is the voltage received by the rectifier module, and the output voltage is the voltage across the load device.

[0017] As a further description of the solution of the present invention, the working process of the control module includes:

[0018] When the input voltage is detected to be unstable or completely interrupted, the MOS tube is periodically turned on and off under the control of the PWM wave, so that the inductor stores energy and releases the energy when the switch tube is turned off, thereby achieving boost and cooperating with the battery to supply power to the load normally;

[0019] On the contrary, when the input voltage is monitored to be stable, the duty cycle of the PWM wave is adjusted and the on-time of the control switch tube is controlled so that the output voltage is lower than the input voltage, thereby achieving voltage reduction to charge the battery.

[0020] As a further description of the solution of the present invention, the working process of the control module also includes:

[0021] The current input voltage and output voltage are obtained, and then compared with the standard input voltage and output voltage, and the comparison result is fed back to the control module. The control module controls the on and off of the MOS tube through the PWM wave to achieve step-up and step-down.

[0022] As a further description of the solution of the present invention, the working process of the control module also includes:

[0023] Real-time acquisition of input voltage change function U over time in (t) and the output voltage as a function of time U out (t), the stability factor σ of the DC power supply system is calculated by the following formula:

[0024]

[0025] Where α and β are weight coefficients, U1(t) and U2(t) are standard variation functions of input voltage and output voltage respectively, and U in (t2) and U out (t2) are the current input voltage and output voltage, t1 is the initial monitoring time, and t2 is the current time;

[0026] Compare the stability coefficient σ with the preset stability coefficient threshold [σ1,σ2]. If σ belongs to [σ1,σ2], it means that the power supply system is stable. Otherwise, it means that the power supply system is unstable and an early warning is issued immediately.

[0027] Beneficial effects of the present invention:

[0028] 1. Through the flexible control of the buck-boost module, the system can adjust the range of DC voltage to meet the voltage requirements of different load devices;

[0029] 2. Using advanced high-speed MOS tube switching technology, the system can quickly respond to input voltage and load changes to ensure the stability and reliability of the output voltage;

[0030] 3. The system has a complete monitoring function, which can monitor the operating status and parameters of the system in real time, and can take timely measures to protect the safety of equipment and personnel under abnormal circumstances. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0032] Figure 1 The schematic diagram of the structure of the DC power supply system in the power distribution room based on the step-up and step-down module control of the present invention is shown in FIG. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention discloses a DC power supply system for a power distribution room based on buck-boost module control, the system comprising a rectifier module, an energy storage module, a buck-boost module, a load interface and an intelligent control unit;

[0035] The rectifier module is connected to the mains terminal and is used to convert AC power into DC power to supply power to the load;

[0036] The buck-boost module is used to adjust the output voltage according to the PWM signal to achieve a boost or buck function;

[0037] The energy storage module includes a plurality of storage batteries, which are used to provide temporary power support when the power grid is abnormal;

[0038] The monitoring module is used to monitor the operating status of the system in real time and send a control signal corresponding to the monitoring result to the control module through the communication module;

[0039] The control module is used to send the corresponding PWM signal to the buck-boost module according to the control signal of the communication module.

[0040] Through the above technical scheme, the present invention provides a stable DC voltage output to the load, rectifies the AC power and supplies power to the load, and simultaneously charges the battery after stepping down the voltage by precisely controlling the buck-boost module based on PWM signal processing. When the AC power is not supplied or the AC power is unstable, the control module switches to the battery to supply power to the load. According to the supply voltage of the load, the buck-boost module is precisely controlled based on PWM signal processing to boost the output voltage and supply power to the load, thereby ensuring the stability and reliability of the power supply and adapting to changes in different loads and voltage requirements.

[0041] As a further description of the solution of the present invention, the buck-boost module includes at least one buck-boost unit;

[0042] One of the buck-boost units includes a resistor R1, a MOS tube Q1, and a MOS tube Q2. The G pole of the MOS tube Q1 is externally connected to a PWM1 control signal, the G pole of the MOS tube Q2 is externally connected to a PWM2 control signal, and the D pole of the MOS tube Q1 is connected to the S pole of the MOS tube Q2.

[0043] As a further description of the scheme of the present invention, when the buck-boost unit is set to two, the other buck-boost unit includes a resistor R2, a MOS tube Q3, and a MOS tube Q4, the G pole of the MOS tube Q3 is externally connected to the PWM3 control signal, the G pole of the MOS tube Q4 is externally connected to the PWM4 control signal, and the D pole of the MOS tube Q3 is connected to the S pole of the MOS tube Q4.

[0044] As a further description of the solution of the present invention, the monitoring module is used to monitor the input voltage and output voltage parameters in real time, and feed back the input voltage and output voltage parameters to the control module;

[0045] The input voltage is the voltage received by the rectifier module, and the output voltage is the voltage across the load device.

[0046] As a further description of the solution of the present invention, the monitoring module is used to monitor the input voltage and output voltage parameters in real time, and feed back the input voltage and output voltage parameters to the control module;

[0047] The input voltage is the voltage received by the rectifier module, and the output voltage is the voltage across the load device.

[0048] As a further description of the solution of the present invention, the working process of the control module includes:

[0049] When the input voltage is detected to be unstable or completely interrupted, the MOS tube is periodically turned on and off under the control of the PWM wave, so that the inductor stores energy and releases the energy when the switch tube is turned off, thereby achieving boost and cooperating with the battery to supply power to the load normally;

[0050] On the contrary, when the input voltage is monitored to be stable, the duty cycle of the PWM wave is adjusted and the on-time of the control switch tube is controlled so that the output voltage is lower than the input voltage, thereby achieving voltage reduction to charge the battery.

[0051] See also Figure 1 As shown, in this embodiment, when the AC power is supplied, the load is powered by the AC power after rectification, and the on-off of Q4 or Q2 is controlled by PWM, and the duty cycle of the PWM wave is adjusted to make the on-off of Q4 or Q2 reach a balance to reduce the input voltage and charge the battery. When there is no AC battery to supply power to the load, the on-off of Q3 or Q1 is controlled by PWM, and the duty cycle of the PWM wave is adjusted to make the on-off of Q3 or Q1 reach a balance to increase the output voltage of the battery and supply power to the load. When the AC power is suddenly cut off, emergency power can be provided to avoid damage to the equipment, and stable power can be provided to prevent damage to the equipment caused by excessive high or low voltage.

[0052] As a further description of the solution of the present invention, the working process of the control module also includes:

[0053] The current input voltage and output voltage are obtained, and then compared with the standard input voltage and output voltage, and the comparison result is fed back to the control module. The control module controls the on and off of the MOS tube through the PWM wave to achieve step-up and step-down.

[0054] As a further description of the solution of the present invention, the working process of the control module also includes:

[0055] Real-time acquisition of input voltage change function U over time in (t) and the output voltage as a function of time U out (t), the stability factor σ of the DC power supply system is calculated by the following formula:

[0056]

[0057] Where α and β are weight coefficients, U1(t) and U2(t) are standard variation functions of input voltage and output voltage respectively, and U in (t2) and U out (t2) are the current input voltage and output voltage, t1 is the initial monitoring time, and t2 is the current time;

[0058] Compare the stability coefficient σ with the preset stability coefficient threshold [σ1,σ2]. If σ belongs to [σ1,σ2], it means that the power supply system is stable. Otherwise, it means that the power supply system is unstable and an early warning is issued immediately.

[0059] Through the above technical solution, this embodiment monitors the input voltage change function U over time. in (t) and the output voltage as a function of time U out (t), then, by the formula Calculate the stability factor σ of the DC power supply system, where: is the difference between the cumulative change of input voltage and the standard cumulative change, is the difference between the output voltage cumulative change and the standard cumulative change, U in (t2) is the real-time input voltage, U out (t2) is the real-time output voltage. The stability coefficient σ is compared with the preset stability coefficient threshold [σ1,σ2]. If σ belongs to [σ1,σ2], it means that the power supply system is stable. Otherwise, it means that the power supply system is unstable. An early warning is issued immediately to ensure that a stable power supply can be provided to prevent damage to the equipment caused by excessively high or low voltage.

[0060] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A DC power supply system for a power distribution room based on buck-boost module control, characterized in that: The system includes a rectifier module, an energy storage module, a buck-boost module, a load interface and an intelligent control unit; The rectifier module is connected to the mains terminal and is used to convert AC power into DC power to supply power to the load; The buck-boost module is used to adjust the output voltage according to the PWM signal to achieve a boost or buck function; The energy storage module includes a plurality of storage batteries, which are used to provide temporary power support when the power grid is abnormal; The monitoring module is used to monitor the operating status of the system in real time and send a control signal corresponding to the monitoring result to the control module through the communication module; The control module is used to send the corresponding PWM signal to the buck-boost module according to the control signal of the communication module.

2. According to the DC power supply system of a power distribution room based on buck-boost module control according to claim 1, it is characterized in that: The buck-boost module includes at least one buck-boost unit; One of the buck-boost units includes a resistor R1, a MOS tube Q1, and a MOS tube Q2. The G pole of the MOS tube Q1 is externally connected to a PWM1 control signal, the G pole of the MOS tube Q2 is externally connected to a PWM2 control signal, and the D pole of the MOS tube Q1 is connected to the S pole of the MOS tube Q2.

3. A DC power supply system for a power distribution room based on buck-boost module control according to claim 2, characterized in that: When the buck-boost unit is set to two, the other buck-boost unit includes a resistor R2, a MOS tube Q3, and a MOS tube Q4. The G pole of the MOS tube Q3 is externally connected to the PWM3 control signal, the G pole of the MOS tube Q4 is externally connected to the PWM4 control signal, and the D pole of the MOS tube Q3 is connected to the S pole of the MOS tube Q4.

4. According to the DC power supply system of a power distribution room based on buck-boost module control according to claim 1, it is characterized in that: The monitoring module is used to monitor the input voltage and output voltage parameters in real time, and feed back the input voltage and output voltage parameters to the control module; The input voltage is the voltage received by the rectifier module, and the output voltage is the voltage across the load device.

5. A DC power supply system for a power distribution room based on buck-boost module control according to claim 4, characterized in that: The working process of the control module includes: When the input voltage is detected to be unstable or completely interrupted, the MOS tube is periodically turned on and off under the control of the PWM wave, so that the inductor stores energy and releases the energy when the switch tube is turned off, thereby achieving boost and cooperating with the battery to supply power to the load normally; On the contrary, when the input voltage is monitored to be stable, the duty cycle of the PWM wave is adjusted and the on-time of the control switch tube is controlled so that the output voltage is lower than the input voltage, thereby achieving voltage reduction to charge the battery.

6. A DC power supply system for a power distribution room based on buck-boost module control according to claim 5, characterized in that: The working process of the control module also includes: The current input voltage and output voltage are obtained, and then compared with the standard input voltage and output voltage, and the comparison result is fed back to the control module. The control module controls the on and off of the MOS tube through the PWM wave to achieve step-up and step-down.

7. A DC power supply system for a power distribution room based on buck-boost module control according to claim 6, characterized in that: The working process of the control module also includes: Real-time acquisition of input voltage change function U over time in (t) and the output voltage as a function of time U out (t), the stability factor σ of the DC power supply system is calculated by the following formula: Where α and β are weight coefficients, U1(t) and U2(t) are standard variation functions of input voltage and output voltage respectively, and U in (t2) and U out (t2) are the current input voltage and output voltage, t1 is the initial monitoring time, and t2 is the current time; Compare the stability coefficient σ with the preset stability coefficient threshold [σ1,σ2]. If σ belongs to [σ1,σ2], it means that the power supply system is stable. Otherwise, it means that the power supply system is unstable and an early warning is issued immediately.

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