CN111490588B - Realization method of mutual backup of communication power supply and operation power supply in substation - Google Patents

Abstract

The implementation method for mutual backup of the transformer substation communication power supply and the operation power supply comprises the steps of determining input and output voltage or power in the transformer substation communication power supply and the operation power supply, and determining the turns ratio of a primary coil to a secondary coil in a high-frequency transformer connected between the communication power supply and the operation power supply according to the determined input and output voltage or power; determining the working mode of the high-frequency transformer according to the current power supply backup requirement; and the input end of the high-frequency transformer is respectively connected with an operating power supply or a communication power supply, and the power supply backup operation is completed after the turn ratio of the primary coil and the secondary coil in the high-frequency transformer is adjusted. The corresponding voltage-boosting and voltage-boosting operation is realized by adjusting the turn ratio of the coil in the high-frequency transformer, and the method is applicable to mutual backup of direct-current power supplies with any voltage grade and power grade. The communication power supply and the operation power supply of the transformer substation have higher safety and power supply reliability.

Description

Realization method of mutual backup between communication power supply and operation power supply in substation

technical field

The application belongs to the field of power supply management, and in particular relates to a method for realizing mutual backup of a substation communication power supply and an operation power supply.

Background technique

The DC power supply of the substation can provide a stable DC supply for various equipment and play a very important role. At present, the operating power supply and communication power supply of many substations are equipped with a set of batteries. The substations equipped with this method have many defects. For example, when the AC power fails and the battery fails, there is a risk of failure of the DC power supply of the substation, which may easily lead to major accidents. , causing huge economic losses. In addition, when checking the capacity of the battery, it is often necessary to carry an additional backup power supply for short-term parallel switching, which increases the difficulty and complexity of the operation, and is prone to human error, which will bring harm to the maintenance work of the battery. Larger personal and property expenses.

At present, DC system backup mostly uses two or more sets of battery packs connected in parallel on the same section of DC bus, or two sets of DC systems are mutually used as backup power supply through switch control. Both of the backup methods realized by these two methods have the above-mentioned shortcomings, and there are certain potential problems. risk. Many electric power researchers solve the above problems by connecting the control device at the input and output ends of the battery pack or using two sets of DC systems to directly connect to the flexible jumper device. When an abnormality occurs or maintenance is required, the safety of the DC system can be improved. and power supply reliability. However, the parallel connection of multiple sets of batteries on the DC bus through the control device will greatly increase the maintenance cost and investment cost of the substation; the flexible bridging method between the two DC systems will greatly increase the voltage level of the two DC systems, The power level has higher requirements, and it is not suitable for backup between two sets of DC systems with different specifications.

Contents of the invention

In order to solve the shortcomings and deficiencies in the prior art, this application proposes a method for realizing mutual backup of the communication power supply and the operating power supply of the substation. There is no specification requirement for the DC systems on both sides, so that the communication power supply and the operating power supply of the substation have higher The safety and reliability of power supply; and the backup power supply can seamlessly and uninterruptedly supply power for abnormal DC power loads, effectively reducing the risk of DC power failure in substations.

Specifically, the implementation method of the substation communication power supply and the operation power supply as mutual backup proposed in the embodiment of the present application, the implementation method includes:

Determine the input and output voltage or power of the communication power supply and the operating power supply of the substation, and determine the turns ratio of the primary coil to the secondary coil in the high-frequency transformer connected between the communication power supply and the operating power supply according to the determined input and output voltage or power;

Determine the working mode of the high-frequency transformer according to the current power backup requirements;

Connect the operating power supply or the communication power supply to the input terminals of the high-frequency transformer, and adjust the turns ratio of the primary coil and the secondary coil in the high-frequency transformer to complete the power backup operation.

Optionally, the determination of the working mode of the high-frequency transformer according to the current power backup requirement includes:

When the operating power supply is backed up by the communication power supply, the high-frequency transformer step-down mode is used; or

When the communication power supply backs up the operating power supply, a high-frequency transformer boost mode is used.

Optionally, when the operating power supply is backed up by the communication power supply, a high-frequency transformer step-down mode is adopted, including:

The operating power supply is connected to the input terminal of the high-frequency transformer, and the communication power supply is connected to the output terminal of the high-frequency transformer;

When abnormal operation of the communication power supply is detected, the PWM isolation drive module is quickly started, and the MOS module C and MOS module D are controlled to be in the switching state;

The energy output by the operating power supply is step-down and rectified by the high-frequency transformer, and then seamlessly and uninterruptedly output to the output line of the communication power supply as a backup power supply for the communication power supply.

Optionally, when the communication power supply backs up the operating power supply, a high-frequency transformer boost mode is adopted, including:

The communication power supply is connected to the input terminal of the high-frequency transformer, and the operating power supply is connected to the output terminal of the high-frequency transformer;

When abnormal operation of the operating power supply is detected, the PWM isolation drive module is quickly started, and the MOS module C and MOS module D are controlled to be in the switching state;

The energy output by the communication power supply is boosted and rectified by the high-frequency transformer, and then seamlessly and uninterruptedly output to the output line of the operating power supply as a backup power supply for the operating power supply.

Optionally, the protection backup device for the communication power supply and the operating power supply of the substation adopts a one-way DC/DC conversion or a two-way DC/DC conversion to realize the mutual backup function of the operating power supply and the communication power supply.

Optionally, the implementation method also includes:

Communication power and operating power are physically isolated from each other.

The beneficial effects brought by the technical solution provided by the application are:

By adjusting the coil turns ratio in the high-frequency transformer to achieve the corresponding buck-boost operation, it can be applied to DC power supplies of any voltage level and power level as mutual backup. At the same time, the backup power supply can seamlessly and uninterruptedly supply power to abnormal DC power loads, effectively reducing the risk of DC power failure in substations.

Description of drawings

In order to illustrate the technical solution of the present application more clearly, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. Ordinary technicians can also obtain other drawings based on these drawings on the premise of not paying creative work.

Fig. 1 is the schematic flow chart of the method that this application proposes;

Fig. 2 is the implementation block diagram of the present application;

Fig. 3 is a circuit structure diagram in which the operating power supply is backed up by the communication power supply;

Fig. 4 is a circuit structure diagram in which the communication power supply is backed up by the operating power supply.

Detailed ways

In order to make the structure and advantages of the present application clearer, the structure of the present application will be further described below in conjunction with the accompanying drawings.

Embodiment one

The implementation method of the mutual backup of the substation communication power supply and the operation power supply proposed in the embodiment of the present application, as shown in Figure 1, the implementation method includes:

11. Determine the input and output voltage or power of the communication power supply and the operating power supply of the substation, and determine the turns ratio of the primary coil to the secondary coil in the high-frequency transformer connected between the communication power supply and the operating power supply according to the determined input and output voltage or power ;

12. Determine the working mode of the high-frequency transformer according to the current power backup requirements;

13. Connect the operating power supply or the communication power supply to the input terminals of the high-frequency transformer, and adjust the turns ratio of the primary coil and the secondary coil in the high-frequency transformer to complete the power backup operation.

In implementation, the present application provides a method for implementing a substation communication power supply and an operating power supply as mutual backup devices. As shown in Figure 2, the involved components include CPU module A, high-frequency transformer B, MOS module C, MOS module D, PWM isolation drive module E, diode F, current sensor G, voltage acquisition module H.

The primary winding group of the high-frequency transformer B leads to an intermediate tap, and the MOS module C and the MOS module D are respectively connected to the lead wires of the primary coil of the high-frequency transformer B; the diode F and the current sensor G is sequentially connected to the output line of the high-frequency transformer B, and the voltage acquisition module H is connected in parallel to the output line, and the current sensor G and the voltage acquisition module H are used to collect the current and voltage of the DC power supply Real-time situation; the CPU module A is respectively connected with the current sensor G and the voltage acquisition module H for receiving and processing the collected data, judging the operating status of the DC power supply, and sending control instructions; the PWM isolation drive module One end of E is connected to the CPU module A, and the other end is connected to the gate of the MOS module for receiving instructions from the CPU module and sending a drive to the MOS module to control the opening and closing of the MOS module. A method for implementing a substation communication power supply and operation power supply protection backup device, including:

(1) Connect a substation communication power supply and operating power supply as a mutual backup device between the first DC power supply and the second DC power supply, and select appropriate turns according to the voltage and power level of the first DC power supply and the second DC power supply High frequency transformer with digital ratio.

(2) When the operating power supply is backed up by the communication power supply, as shown in Figure 3, the high-frequency transformer B adopts a step-down mode, the operating power supply is connected to the input end of the application device, and the communication power supply is connected to the output end of the application device; the current sensor G and the voltage acquisition module H respectively collect the current and voltage changes on the output line of the communication power supply, and transmit them to the CPU module A at specific time intervals for data analysis and processing. When the output of the communication power supply is abnormal and its voltage and current values change, the CPU module A immediately judges the abnormal situation, and sends an instruction to start the backup power supply to the PWM isolation drive module E, and the PWM isolation drive module E intelligently adjusts the duty cycle of PWM1 and PWM2, Control the MOS module C and MOS module D to be in the switch state, the energy output by the operating power supply is converted into alternating current after being oscillated by the MOS module, and is step-down and rectified by the high-frequency transformer B to seamlessly and uninterruptedly provide DC power for the load of the communication power supply Can be used as a backup power supply for communication power.

(3) When the communication power supply backs up the operating power supply, as shown in Figure 4, the high-frequency transformer B adopts the boost mode, the communication power supply is connected to the input terminal of the device, and the operating power supply is connected to the output terminal of the device; the current sensor G and the voltage acquisition Module H separately collects the current and voltage changes on the output lines of the operating power supply, and transmits them to CPU module A at specific time intervals for data analysis and processing. When the output of the operating power supply is abnormal and its voltage and current values change, the CPU module A immediately judges the abnormal situation and sends an instruction to start the backup power supply to the PWM isolation drive module E. The PWM isolation drive module E intelligently adjusts the duty cycle of PWM1 and PWM2. Control the MOS module C and MOS module D to be in the switch state, the energy output by the communication power supply is converted into alternating current after being oscillated by the MOS module, and is boosted and rectified by the high-frequency transformer B to provide direct current for the load of the operating power supply Can be used as a backup power supply for the operating power supply.

Optionally, the protection backup device for the communication power supply and the operating power supply of the substation adopts a one-way DC/DC conversion or a two-way DC/DC conversion to realize the mutual backup function of the operating power supply and the communication power supply. Communication power and operating power are physically isolated from each other.

This application proposes a method for realizing a substation communication power supply and an operating power supply as mutual backup devices, which has a wide range of application scenarios and can be applied to DC power supplies of any voltage level and power level as mutual backup. The operating power supply can transmit energy through the step-down mode as the backup power supply of the communication power supply, and the communication power supply can transmit energy through the boost mode as the backup power supply of the operating power supply, so that the communication power supply and the operating power supply of the substation have higher security and power supply reliability . The application of this application can physically isolate the abnormal DC power supply and the backup power supply from each other without affecting each other, and the backup power supply can seamlessly and uninterruptedly supply power to the load of the abnormal DC power supply, effectively reducing the risk of failure of the DC power supply in the substation. Adopting this application can simplify the discharge process of the nuclear capacity of the battery in the substation, no need to carry an additional backup power supply, no tedious and complicated short-term parallel switching, and save a lot of human, financial and material expenses for the maintenance of the battery.

The serial numbers in the above embodiments are for description only, and do not represent the sequence of the components during assembly or use.

The above is only an embodiment of the application, and is not intended to limit the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the application shall be included in the protection scope of the application. Inside.

Claims (3)

1. The realization method that substation communication power supply and operating power supply are mutual backup, it is characterized in that, described realization method comprises: Determine the input and output voltage or power of the communication power supply and the operating power supply of the substation, and determine the turns ratio of the primary coil to the secondary coil in the high-frequency transformer connected between the communication power supply and the operating power supply according to the determined input and output voltage or power; Determine the working mode of the high-frequency transformer according to the current power backup requirements; Connect the operating power supply or communication power supply to the input terminals of the high-frequency transformer, and adjust the turns ratio of the primary coil and the secondary coil in the high-frequency transformer to complete the power backup operation; Said determining the working mode of the high-frequency transformer according to the current power backup requirement; including: When the operating power supply is backed up by the communication power supply, the high-frequency transformer step-down mode is used; or When the communication power supply backs up the operating power supply, the high-frequency transformer boost mode is adopted; When the operating power supply is backed up by the communication power supply, a high-frequency transformer step-down mode is adopted, including: The operating power supply is connected to the input terminal of the high-frequency transformer, and the communication power supply is connected to the output terminal of the high-frequency transformer; When abnormal operation of the communication power supply is detected, the PWM isolation drive module is quickly started, and the MOS module C and MOS module D are controlled to be in the switching state; The energy output by the operating power supply is step-down and rectified by the high-frequency transformer, and then seamlessly and uninterruptedly output to the output line of the communication power supply as a backup power supply for the communication power supply; When the communication power supply backs up the operating power supply, a high-frequency transformer boost mode is adopted, including: The communication power supply is connected to the input terminal of the high-frequency transformer, and the operating power supply is connected to the output terminal of the high-frequency transformer; When abnormal operation of the operating power supply is detected, the PWM isolation drive module is quickly started, and the MOS module C and MOS module D are controlled to be in the switching state; The energy output by the communication power supply is boosted and rectified by the high-frequency transformer, and then seamlessly and uninterruptedly output to the output line of the operating power supply as a backup power supply for the operating power supply. 2. The method for realizing mutual backup of substation communication power supply and operation power supply according to claim 1, characterized in that, said a kind of substation communication power supply and operation power supply protection backup device adopts unidirectional DC/DC conversion or bidirectional DC/DC conversion The method of DC conversion realizes the mutual backup function of the operation power supply and the communication power supply. 3. The realization method that the substation communication power supply and the operating power supply are mutually backed up according to claim 1, is characterized in that, the realization method also includes: Communication power and operating power are physically isolated from each other.

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