CN114884200B - Secondary fusion on-column switch controller backup power supply system - Google Patents

Abstract

The utility model provides a secondary fuses on-column switch controller reserve power supply system, including once switch, adjustable class steady voltage unit, charge-discharge management unit and two reserve power supply units. The primary switch obtains electric energy and outputs the electric energy to the adjustable current voltage stabilizing unit, and the electric energy is processed into direct current with a preset voltage level and then is input into the charge and discharge management unit. The charge and discharge management unit is electrically connected with the dual-backup power supply, monitors the working state of the dual-backup power supply in real time, and calculates the residual working electric quantity and the residual time of the dual-backup power supply so as to execute a backup power supply scheme. The dual-backup power supply is provided, and the standby power supply schemes in various combination modes can be realized by controlling the switching of the dual-backup power supply; the double-backup power supply can provide extremely large current instantly, so that the problem of insufficient instant current output capability of a single-backup power supply system is solved; and one set of hardware can adapt to the direct current grade of various specifications.

Description

Primary and secondary fusion pole switch controller backup power supply system

Technical Field

The present disclosure relates to the technical field of backup power supply systems, and in particular to a primary-secondary fusion pole-mounted switch controller backup power supply system.

Background Art

my country's power system is experiencing a booming development in the green energy transformation. New power systems have emerged under this situation. The construction and transformation of distribution networks are an important part of new power systems. Increasing the deployment of intelligent terminals in distribution networks and improving the observability, measurability and controllability of new infrastructure for sources, grids, loads and storage are urgent needs of new power systems. The distribution network equipment technology based on primary and secondary integration is an effective means to improve the level of distribution equipment and an important symbol of the achievements of intelligent distribution network construction in my country's new power system.

The primary and secondary fusion pole-mounted switch uses an electronic AC sensor encapsulated in the pole or installed in the box. With the low power consumption, miniaturization and modularization of the secondary side controller, the secondary equipment is close to the primary equipment, and the integration of the switch is further improved. The primary and secondary fusion pole-mounted switch consists of a switch body, a controller, a connecting cable, etc. The main function of the controller is to collect the electrical quantity of the primary switch and control the switch to open and close. The primary switch has a DC motor mechanism inside, which is driven by the DC provided by the controller. The switch can be opened and closed in the presence or absence of AC power to realize the functions related to feeder automation. Therefore, the quality of the controller backup power system is crucial.

Common primary and secondary fusion pole-mounted switch controllers generally use lead-acid batteries or lithium batteries as backup power supplies. Lead-acid batteries have problems with short service life and pollution. Although lithium batteries have a long life and are safer, they also have insufficient output capacity and insufficient protection methods for lithium batteries.

Therefore, there is an urgent need for a backup power supply system for a primary and secondary fusion pole-mounted switch controller with lithium battery protection function and high current output capability.

Summary of the invention

In view of this, the purpose of the present disclosure is to provide a primary-secondary fusion pole-mounted switch controller backup power supply system.

Based on the above purpose, the present disclosure provides a primary and secondary fusion column switch controller backup power supply system, including:

A primary switch is configured to obtain electrical energy and output it;

an adjustable current stabilizing unit, electrically connected to the primary switch, configured to receive the electric energy output by the primary switch, rectify and stabilize the electric energy, and output direct current of a preset voltage level;

a charge and discharge management unit, electrically connected to the primary switch and the adjustable current stabilizing unit, respectively, configured to receive the direct current output by the adjustable current stabilizing unit and control the primary switch, and select a corresponding backup power supply scheme to power the system according to a preset power supply principle;

The dual backup power supply unit is electrically connected to the charge and discharge management unit and is configured to supply power to the system in the event of a power outage. The charge and discharge management unit is used to monitor its working status in real time, calculate its remaining working power and remaining working time, and execute the backup power supply solution.

Furthermore, the primary switch includes a capacitor power supply device and a DC electric device;

The capacitor power taking device is electrically connected to the adjustable current stabilizing unit and is configured to obtain the electric energy from the primary switch and perform voltage reduction processing on the electric energy using a capacitor;

The DC electric device is electrically connected to the charge and discharge management unit, and is configured to perform opening and closing control on the primary switch according to the monitoring result of the charge and discharge management unit.

Further, the dual backup power supply unit includes a lithium battery pack, a measurement and control switch D1, a supercapacitor pack, and a measurement and control switch D2;

The measurement and control switch D1 is electrically connected to the lithium battery pack and the charge and discharge management unit respectively, and is configured to obtain voltage and current data of the lithium battery pack in real time, transmit the data to the charge and discharge management unit, and receive a control signal fed back by the charge and discharge management unit;

The measurement and control switch D2 is electrically connected to the supercapacitor group and the charge and discharge management unit respectively, and is configured to obtain voltage and current data of the supercapacitor group in real time, transmit the data to the charge and discharge management unit, and receive a control signal fed back by the charge and discharge management unit.

Furthermore, the measuring and controlling switch D1 and the measuring and controlling switch D2 each include a switch body, a voltage measuring circuit, and a current measuring circuit.

The voltage measurement circuit and the current measurement circuit are configured to measure the real-time voltage and current of the lithium battery pack and the supercapacitor pack, and the switch body is configured to control the working state of the lithium battery pack and the supercapacitor pack.

Furthermore, the working status of the dual backup power supply unit is monitored in real time, and the remaining working power and remaining working time thereof are calculated, including:

The supercapacitor group is monitored, and the voltage and current data of the supercapacitor group are collected through the measurement and control switch D2 and transmitted to the charge and discharge management unit. The remaining working power and the remaining working time are calculated by the charge and discharge management unit. The remaining working power calculation formula is:

Wherein, Q is the remaining working power, C is the capacitance of the supercapacitor bank, V0 is the capacitor discharge start voltage, Vs is the discharge cut-off voltage set by the system, I is the discharge current, and t is the time;

The remaining working time of the supercapacitor group is:

Among them, T is the remaining working time of the supercapacitor group, Q is the remaining working power, and I is the discharge current.

Furthermore, the preset power supply principle includes:

In response to supplying power to the DC electric device, obtaining electrical energy from the primary switch,

In response to insufficient power being obtained by the primary switch, power is obtained from the dual backup power supply unit according to the backup power supply scheme.

Furthermore, the backup power supply scheme includes: a single lithium battery pack power supply scheme, a single supercapacitor pack power supply scheme, and a dual backup power supply scheme.

Further, the selecting a corresponding backup power supply scheme to power the system according to a preset power supply principle includes:

In response to insufficient power acquisition by the primary switch, a single supercapacitor group power supply scheme, a single lithium battery group power supply scheme or a dual backup power supply scheme is selected, and the lithium battery group or the supercapacitor group is controlled to supply power through the charge and discharge management unit.

Furthermore, the selecting a corresponding backup power supply scheme to power the system according to a preset power supply principle also includes:

In response to frequent switch operation without AC power outage, a single supercapacitor group power supply scheme or a dual backup power supply scheme is selected, and the supercapacitor group or the lithium battery group is controlled by the charge and discharge management unit to supply power;

In response to the system working requirement of low current and long battery life, a single super lithium battery pack power supply solution or a dual backup power supply power supply solution is selected, and the lithium battery pack or the super capacitor pack is controlled by the charge and discharge management unit to supply power.

Furthermore, the selecting a corresponding backup power supply scheme to power the system according to a preset power supply principle also includes:

In response to the primary switch obtaining insufficient power and the supercapacitor group having sufficient power, a dual backup power supply solution is selected, and the supercapacitor group is controlled to supply power through the charge and discharge management unit;

In response to insufficient power obtained by the primary switch and insufficient power of the supercapacitor group, a dual backup power supply solution is selected, and the lithium battery group is controlled by the charge and discharge management unit to supply power.

From the above, it can be seen that the present disclosure provides a primary and secondary integrated pole-mounted switch controller backup power supply system, including a primary switch, an adjustable current stabilizing unit, a charge and discharge management unit and a dual backup power supply unit. The primary switch obtains electrical energy and outputs it to the adjustable current stabilizing unit, which is processed into direct current of a preset voltage level and then input into the charge and discharge management unit. The charge and discharge management unit is electrically connected to the dual backup power supplies, monitors the working status of the dual backup power supplies in real time, and calculates the remaining working power and remaining time to execute the backup power supply plan. The present disclosure provides a dual backup power supply, which can realize backup power supply plans in various combinations by controlling the dual backup power supplies to be put in and out; the dual backup power supply can instantly provide extremely large current, solve the problem of insufficient instantaneous current output capacity of a single backup power supply system, and can achieve a set of hardware to adapt to various specifications of DC levels.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the drawings required for use in the embodiments or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of a primary-secondary fusion column switch controller backup power supply system according to an embodiment of the present disclosure;

FIG2 is a schematic diagram of a backup power supply system for an existing primary and secondary fusion column switch controller;

FIG3 is a schematic diagram of a preset power supply principle according to an embodiment of the present disclosure;

FIG4 is a schematic diagram of a backup power supply solution according to an embodiment of the present disclosure;

FIG5 is a schematic diagram of a power supply sequence of a dual backup power supply solution according to an embodiment of the present disclosure.

DETAILED DESCRIPTION

In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should have the usual meanings understood by people with ordinary skills in the field to which the present disclosure belongs. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

As described in the background technology, common primary and secondary fusion pole-mounted switch controllers generally use lead-acid batteries or lithium batteries as backup power supplies. Among them, primary and secondary fusion refers to the inclusion of some secondary equipment intelligent units in the primary equipment in the power system, making the primary equipment more intelligent and equipped with measurement, metering, relay protection, monitoring, control and other functions. The high-voltage primary equipment is close to or even integrated with the secondary equipment. The primary equipment is located on the high-voltage line and the secondary equipment is located on the low-voltage side. There is no safety risk and it is easy to operate manually.

Although lead-acid batteries can discharge at high currents and are suitable for most controllers, they are more polluting and have a short service life. Controllers that require high current discharge operations may fail to operate due to battery aging. In view of the urgent need for green energy transformation in new power systems, green, environmentally friendly and pollution-free lithium batteries are more in line with the market. Lithium batteries have large capacity and small size. In addition to being environmentally friendly, their main advantages over lead-acid batteries are: high cell voltage and high energy density, which can effectively reduce the use space; cycle life can be up to 2,000 times or more, while ordinary lead-acid batteries have a cycle life of 300 to 500 times; high temperature resistance, safer to use; low self-discharge rate, no memory effect, and can be charged and used at any time.

Most of the existing primary and secondary integrated pole switch controller backup power supply systems rely on a single lithium battery pack. However, single lithium battery power supply also has some disadvantages: although there is a charge and discharge protection circuit to prevent the damage to the lithium battery caused by overcharging and over-discharging, it will still generate serious heat when working under strong load current for a long time, which will affect the service life and available capacity of the lithium battery. Therefore, it cannot be used for a long time to discharge high current in the operating circuit; lithium batteries also have high requirements for the charging circuit, and the control circuit needs to be protected and cannot be float charged, otherwise it is easy to overcharge and over-discharge and cause battery failure.

The existing primary and secondary fusion column switch controller backup lithium battery power supply system generally provides fixed levels of DC power supply according to the specifications of the lithium battery, such as DC24V and DC48V. Once the specifications of the lithium battery are determined, the hardware system is fixed, and the DC voltage level it provides is fixed. Generally, it does not support the compatibility and interchangeability of DC24V and DC48V battery packs. Once battery packs of different levels are connected incorrectly, it will cause unpredictable damage to the hardware system.

The primary and secondary fusion column switch controller backup power supply system proposed in the present disclosure mainly refers to the system with lithium battery as the backup power supply, and conducts relevant technical analysis and improvement on its technical solution, and forms a dual backup power supply system of lithium battery group and supercapacitor group by adding supercapacitor group. Supercapacitor is not limited by discharge current and can provide extremely large current instantly, which solves the problem of insufficient instantaneous current output capacity of single backup power supply system; at the same time, the auxiliary power supply branch of supercapacitor group of dual backup power supply system can effectively cope with instantaneous large current impact and share load current, provide buffering and protection for lithium battery, and can cope with frequent charging and discharging caused by frequent operation of switch, thus extending battery life.

The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

The present invention provides a primary-secondary fusion column switch controller backup power supply system, comprising:

The primary switch is configured to obtain and output electrical energy; the primary switch is the switch body of the primary and secondary fusion pole-mounted switch, and its external equipment is the primary equipment, including but not limited to generators, transformers, busbars, transmission lines, power cables, reactors, motors, etc.

The adjustable current stabilizing unit is electrically connected to the primary switch and is configured to receive the electric energy output by the primary switch, rectify and stabilize it, and output direct current of a preset voltage level. The task of the rectifier circuit is to use the unidirectional conductivity of the diode to convert the positive and negative alternating alternating current into unidirectional pulsating direct current. Further optionally, this embodiment also connects a filter circuit to the output end of the rectifier circuit to filter out the AC component, thereby obtaining a smooth direct current voltage; the voltage after rectification and filtering is not stable, and when the grid voltage or load changes, the voltage will change, and the ripple voltage is large, so after rectification and filtering, it must also pass through a voltage stabilizing circuit to make the output voltage stable within a certain range. Further optionally, a resonant switching power supply technology with a resonant voltage type dual-loop control is selected, which has the characteristics of high voltage stabilization accuracy and fast dynamic response.

The charge and discharge management unit is electrically connected to the primary switch and the adjustable current stabilizing unit, respectively, and is configured to receive the direct current output by the adjustable current stabilizing unit and control the primary switch, and select a corresponding backup power supply scheme to power the system according to a preset power supply principle.

The dual backup power supply unit is electrically connected to the charge and discharge management unit and is configured to supply power to the system in the event of a power outage. The charge and discharge management unit is used to monitor its working status in real time, calculate its remaining working power and remaining working time, and execute the backup power supply solution.

In this embodiment, the system is composed of a primary device and a secondary device, the primary switch belongs to the primary device, and the adjustable current stabilizing unit, the charge and discharge management unit, and the dual backup power supply unit belong to the secondary device. Further optionally, as shown in FIG1 , in addition to being connected to the adjustable current stabilizing unit, the primary switch, and the dual backup power supply unit, the charge and discharge management unit is also externally connected to a main control unit.

Furthermore, the primary switch includes a capacitor power supply device and a DC electric device.

The capacitor power supply device is electrically connected to the adjustable current stabilizing unit and is configured to obtain the electric energy from the primary switch and use a capacitor to reduce the voltage. Further optionally, the capacitor power supply device uses the capacitive reactance generated by the capacitor at a certain AC signal frequency to limit the maximum operating current, thereby reducing the voltage. Further optionally, in this embodiment, a non-polar iron shell oil-immersed capacitor is selected.

The DC electric device is electrically connected to the charge and discharge management unit and is configured to control the opening and closing of the primary switch according to the monitoring result of the charge and discharge management unit. The electric operating mechanism of the primary and secondary fusion column switch preferentially uses the electric energy taken from the primary switch.

Common pole switches include pole circuit breakers, pole load switches, and pole disconnectors. The DC motors of primary switches are commonly available in different specifications such as DC24V and DC48V. The primary switch has a DC motor that is driven by the DC provided by the controller. The switch can be opened or closed with or without AC power to achieve functions related to feeder automation.

In some embodiments, the dual backup power supply unit includes a lithium battery pack, a measurement and control switch D1, a supercapacitor group, and a measurement and control switch D2; the measurement and control switch D1 is electrically connected to the lithium battery pack and the charge and discharge management unit, respectively, and is configured to obtain the voltage and current data of the lithium battery pack in real time, pass the data to the charge and discharge management unit, and receive the control signal fed back by the charge and discharge management unit; the measurement and control switch D2 is electrically connected to the supercapacitor group and the charge and discharge management unit, respectively, and is configured to obtain the voltage and current data of the supercapacitor group in real time, pass the data to the charge and discharge management unit, and receive the control signal fed back by the charge and discharge management unit.

The dual backup power supply system of lithium battery pack and supercapacitor pack has the advantages of both lithium batteries and supercapacitors. It can solve the problem that the power supply of a single lithium battery pack is limited by the upper limit of the discharge current. It can instantly provide a huge DC output, solving the problem of insufficient instantaneous current output capacity of the backup power supply system.

Supercapacitor is an electrochemical element, but no chemical reaction occurs during its energy storage process. This energy storage process is reversible, and it is precisely because of this that supercapacitors can be repeatedly charged and discharged hundreds of thousands of times, and they have excellent characteristics such as extremely high efficiency, high current capacity, wide voltage range, wide operating temperature range, long rewinding service life, long working life, maintenance-free and easy maintenance, simple integration, and low cost. The operating voltage of a supercapacitor monomer is not high, generally only 1V-4V. Connecting multiple supercapacitor monomers in series to obtain the supercapacitor group can meet the needs of higher operating voltages.

The charge and discharge protection circuit in the lithium battery can prevent the damage to the lithium battery caused by overcharging and over-discharging. However, due to the large internal resistance of the lithium battery, it will generate serious heat when working under strong load current for a long time, affecting its service life and available capacity. The auxiliary power supply branch provided by the supercapacitor group can provide buffering and protection for the lithium battery and effectively share the load current.

Further optionally, this embodiment uses a supercapacitor group with a rated voltage of 48V or above. Since the charge stored in the supercapacitor group is the product of its voltage and the capacitance farad value, it can also carry the charge of the 24V voltage level, so a set of supercapacitors can be compatible with the charge storage of two voltage specifications. When replacing lithium battery packs of different voltage levels, there is no need to replace the supercapacitor group, so that a set of hardware can adapt to multiple specifications of DC levels.

In some embodiments, the measurement and control switch D1 and the measurement and control switch D2 each include a respective switch body, a voltage measurement circuit, and a current measurement circuit, wherein the voltage measurement circuit and the current measurement circuit are configured to measure the real-time voltage and current of the lithium battery group and the supercapacitor group, and the switch body is configured to control the working status of the lithium battery group and the supercapacitor group.

In some embodiments, real-time monitoring of the working status of the dual backup power supply unit and calculation of the remaining working power and remaining working time thereof include:

The supercapacitor group is monitored, and the voltage and current data of the supercapacitor group are collected through the measurement and control switch D2 and transmitted to the charge and discharge management unit. The remaining working power and the remaining working time are calculated by the charge and discharge management unit. The remaining working power calculation formula is:

Among them, Q is the remaining working capacity, unit is coulomb, C is the capacitance of the supercapacitor group, unit is farad; V0 is the capacitor discharge starting voltage, unit is volt; Vs is the discharge cut-off voltage set by the system, unit is volt; I is the discharge current, unit is ampere; t is the time, unit is second.

Further optionally, in order to calculate the discharge charge from the start of discharge to the measurement time t, the present patent adopts the ampere-hour integration method, which is also used when calculating the discharge charge of the lithium battery pack from the start of discharge to the measurement time t.

The fast calculation method of the ampere-hour integration method is as follows:

The first step is to sample the discharge current 2 times or more per second;

The second step is to calculate the second average value of the discharge current;

The third step is to accumulate the average current value per second from the start of discharge to the measurement time t. The resulting value is the discharge charge calculated by the ampere-hour integration method.

After calculating the discharge charge from the start of discharge to the measurement time t, the remaining charge Q is calculated, and then combined with the current discharge current I, the remaining working time of the supercapacitor is calculated.

The remaining working time of the supercapacitor group is:

Among them, T is the remaining working time of the supercapacitor group, Q is the remaining working power, and I is the discharge current.

The above calculation method can predict the time of input and output of the supercapacitor group, which helps the charge and discharge management unit to implement precise control strategy.

In some embodiments, referring to FIG3 , the preset power supply principle includes:

In response to supplying power to the DC electric device, obtaining electrical energy from the primary switch,

In response to insufficient power being obtained by the primary switch, power is obtained from the dual backup power supply unit according to the backup power supply scheme.

In some embodiments, referring to FIG4 , the backup power supply solutions include: a single lithium battery pack power supply solution, a single supercapacitor pack power supply solution, and a dual backup power supply solution. Three backup power supply system solutions can be used according to actual working conditions.

Referring to the primary and secondary fusion column switch controller backup power supply system of the embodiment of the present disclosure in FIG1 and the existing primary and secondary fusion column switch controller backup power supply system in FIG2, the main improvement measures of the embodiment of the present disclosure are to change the single lithium battery pack backup power supply to a dual power backup system, add the supercapacitor group as an auxiliary backup power supply, and add independently operable measurement and control switches D1 and D2 between the two backup power supplies and the charge and discharge management unit. When different power supply schemes are selected according to specific working conditions, the opening and closing of the measurement and control switches D1 and D2 in FIG1 can be controlled to complete the selection of the following different power supply schemes.

In some embodiments, referring to FIG. 4 , the selecting a corresponding backup power supply scheme to power the system according to a preset power supply principle includes:

In response to insufficient power acquisition by the primary switch, a single supercapacitor group power supply scheme, a single lithium battery group power supply scheme or a dual backup power supply scheme is selected, and the lithium battery group or the supercapacitor group is controlled to supply power through the charge and discharge management unit.

Referring to Figure 4, when the primary switch does not obtain enough power, you can choose a single supercapacitor group power supply solution, a lithium battery group power supply solution, and a dual backup power supply solution. When the dual backup power supply solution is selected, the measurement and control switch D1 and the measurement and control switch D2 are closed, and the supercapacitor group and the lithium battery group are jointly powered. Furthermore, a single lithium battery group power supply solution and a single supercapacitor group power supply solution can also be selected.

In some embodiments, referring to FIG. 4 , the selecting a corresponding backup power supply scheme to power the system according to a preset power supply principle further includes:

In response to frequent switch operation without AC power outage, a single supercapacitor group power supply scheme or a dual backup power supply scheme is selected, and the supercapacitor group or the lithium battery group is controlled by the charge and discharge management unit to supply power;

In response to the system working requirement of low current and long battery life, a single super lithium battery pack power supply solution or a dual backup power supply power supply solution is selected, and the lithium battery pack or the super capacitor pack is controlled by the charge and discharge management unit to supply power.

Although the capacity of supercapacitors is smaller than that of lithium batteries, the design of the charging and discharging circuit is simple, the charging speed is fast, and it can also cope with the impact of large current discharge. In addition, supercapacitors have a long service life and no memory, which makes them suitable for short-term power supply after power outages. Therefore, when frequent charging and discharging caused by frequent operation of switches without AC power outages occurs, the single supercapacitor group power supply solution is preferred, the measurement and control switch D1 is opened, and the measurement and control switch D2 is closed, and the supercapacitor group supplies power to the system. Further, a dual backup power supply solution can also be selected.

When the primary switch does not obtain enough power or the system requires a low current for a long time, a single lithium battery pack power supply solution is preferred. The measurement and control switch D2 is opened, and the measurement and control switch D1 is closed. At this time, the lithium battery pack powers the system. Lithium batteries have the advantages of high single-cell voltage and high energy density, which can allow the controller to work continuously and stably for several hours in the event of an AC power outage. Further, a dual backup power supply solution can also be selected.

In some embodiments, the selecting a corresponding backup power supply scheme to power the system according to a preset power supply principle further includes:

In response to the primary switch obtaining insufficient power and the supercapacitor group having sufficient power, a dual backup power supply solution is selected, and the supercapacitor group is controlled to supply power through the charge and discharge management unit;

In response to insufficient power obtained by the primary switch and insufficient power of the supercapacitor group, a dual backup power supply solution is selected, and the lithium battery group is controlled by the charge and discharge management unit to supply power.

In this embodiment, the power supply sequence of the dual backup power supply scheme is shown in FIG5. When the primary switch obtains insufficient power and the supercapacitor group has sufficient power, the dual backup power supply scheme is selected. At this time, the measurement and control switch D1 and the measurement and control switch D2 are closed, and the supercapacitor group is preferentially selected for power supply through the charge and discharge management unit; when the primary switch obtains insufficient power and the supercapacitor group has insufficient power, the dual backup power supply scheme is selected. At this time, the charge and discharge management unit automatically selects the lithium battery group for power supply. Therefore, the advantage of the dual backup power supply is that when one of the backup power supplies is insufficient, the other backup power supply can be put into power supply in time.

It should be noted that, referring to FIG1 , the monitoring function of the charging and discharging unit on the system in the embodiment of the present disclosure can be independently completed by the chip in the charging and discharging unit, or can be executed with the help of a main control unit external to the charging and discharging management unit.

It should be noted that some embodiments of the present disclosure are described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples. Based on the concept of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of simplicity.

In addition, to simplify the description and discussion, and in order not to make the embodiments of the present disclosure difficult to understand, the known power/ground connections to the integrated circuit (IC) chips and other components may or may not be shown in the provided figures. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present disclosure difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform on which the embodiments of the present disclosure will be implemented (that is, these details should be fully within the scope of understanding of those skilled in the art). Where specific details (e.g., circuits) are set forth to describe exemplary embodiments of the present disclosure, it is apparent to those skilled in the art that the embodiments of the present disclosure can be implemented without these specific details or with changes in these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

Although the present disclosure has been described in conjunction with specific embodiments of the present disclosure, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art based on the foregoing description. For example, other primary and secondary fusion pole-mounted switch structures (e.g., circuit breakers, reclosers, sectionalizers) can use the embodiments discussed.

The embodiments of the present disclosure are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present disclosure should be included in the scope of protection of the present disclosure.

Claims (8)

1. A secondary fuses on-column switch controller backup power system, comprising:

a primary switch configured to acquire electric energy and output;

The adjustable current voltage stabilizing unit is electrically connected with the primary switch and is configured to receive the electric energy output by the primary switch, rectify and stabilize the electric energy and output direct current with a preset voltage level;

The charge-discharge management unit is respectively and electrically connected with the primary switch and the adjustable current voltage stabilizing unit, and is configured to receive the direct current output by the adjustable current voltage stabilizing unit and control the primary switch, and select a corresponding backup power supply scheme to supply power to the system according to a preset power supply principle;

The double-backup power supply unit is electrically connected with the charge and discharge management unit and is configured to supply power to the system under the condition of power failure, the charge and discharge management unit is utilized to monitor the working state of the system in real time, the residual working electric quantity and the residual working time of the system are calculated, and the backup power supply scheme is executed;

the double-backup power supply unit comprises a lithium battery pack, a measurement and control switch D1, a super capacitor pack and a measurement and control switch D2;

The measurement and control switch D1 is respectively and electrically connected with the lithium battery pack and the charge and discharge management unit, and is configured to acquire voltage and current data of the lithium battery pack in real time, transmit the data to the charge and discharge management unit and receive a control signal fed back by the charge and discharge management unit;

The measurement and control switch D2 is respectively and electrically connected with the super capacitor bank and the charge and discharge management unit, and is configured to acquire voltage and current data of the super capacitor bank in real time, transmit the data to the charge and discharge management unit and receive control signals fed back by the charge and discharge management unit;

the method for monitoring the working state of the double-backup power supply unit in real time and calculating the residual working electric quantity and the residual working time of the double-backup power supply unit comprises the following steps:

The super capacitor bank is monitored, voltage and current data of the super capacitor bank are collected through the measurement and control switch D2 and transmitted to the charge and discharge management unit, the residual working electric quantity and the residual working time are calculated through the charge and discharge management unit, and the residual working electric quantity calculation formula is as follows:

Q＝C×(V₀-V_s)-∫₀ ^tIdt

Wherein Q is the residual working electric quantity, C is the capacitor of the super capacitor group, V ₀ is the capacitor discharge starting voltage, vs is the discharge cut-off voltage set by the system, I is the discharge current, and t is the time;

the remaining working time of the super capacitor group is as follows:

wherein T is the residual working time of the super capacitor group, Q is the residual working electricity, and I is the discharge current.

2. The system of claim 1, wherein the primary switch comprises a capacitive power take-off and a dc powered device;

the capacitor electricity-taking device is electrically connected with the adjustable current voltage stabilizing unit and is configured to obtain the electric energy from the primary switch and to perform voltage reduction treatment on the electric energy by using a capacitor;

The direct current electric device is electrically connected with the charge and discharge management unit and is configured to perform switching-on and switching-off control on the primary switch according to the monitoring result of the charge and discharge management unit.

3. The system of claim 1, wherein the measurement and control switch D1 and the measurement and control switch D2 each comprise a respective switch body, a voltage measurement loop, a current measurement loop,

The voltage measuring circuit and the current measuring circuit are configured to measure real-time voltage and current of the lithium battery pack and the super capacitor pack, and the switch body is configured to control working states of the lithium battery pack and the super capacitor pack.

4. The system of claim 2, wherein the preset power supply principle comprises:

in response to powering the dc powered device, drawing power from the primary switch,

And responding to the shortage of the primary switch to acquire electric energy, and acquiring electric energy from the double-backup power supply unit according to the backup power supply scheme.

5. The system of claim 1, wherein the backup power scheme comprises: a single lithium battery pack power supply scheme, a single super capacitor pack power supply scheme and a double backup power supply scheme.

6. The system of claim 5, wherein the selecting a corresponding backup power scheme to power the system according to a preset power supply principle comprises:

And responding to the deficiency of the electric energy obtained by the primary switch, selecting a single super capacitor group power supply scheme, a single lithium battery group power supply scheme or a double-backup power supply scheme, and respectively controlling the lithium battery group or the super capacitor group to supply power through the charge and discharge management unit.

7. The system of claim 5, wherein the selecting a corresponding backup power scheme to power the system according to a preset power supply principle further comprises:

responding to frequent operation of a switch under the condition of no power failure of alternating current, selecting a single super capacitor group power supply scheme or a double backup power supply scheme, and controlling the super capacitor group or the lithium battery group to supply power through the charge and discharge management unit;

And responding to the system work requirement to carry out low-current long-time endurance, selecting a single super lithium battery pack power supply scheme or a double-backup power supply scheme, and controlling the lithium battery pack or the super capacitor pack to supply power through a charge-discharge management unit.

8. The system of claim 5, wherein the selecting a corresponding backup power scheme to power the system according to a preset power supply principle further comprises:

the primary switch is used for acquiring insufficient electric energy and the super capacitor bank is sufficient in electric quantity, a double-backup power supply scheme is selected, and the charging and discharging management unit is used for controlling the super capacitor bank to supply power;

And responding to the condition that the primary switch is insufficient in obtaining electric energy and the super capacitor bank is insufficient in electric quantity, selecting a double-backup power supply scheme, and controlling the lithium battery bank to supply power through the charge and discharge management unit.