CN114884200A - One-time and two-time fusion post-standby power supply system of on-pole switch controller - Google Patents

One-time and two-time fusion post-standby power supply system of on-pole switch controller Download PDF

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Publication number
CN114884200A
CN114884200A CN202210415480.2A CN202210415480A CN114884200A CN 114884200 A CN114884200 A CN 114884200A CN 202210415480 A CN202210415480 A CN 202210415480A CN 114884200 A CN114884200 A CN 114884200A
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Prior art keywords
power supply
backup power
management unit
super capacitor
switch
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Inventor
王光磊
马晓昆
王丹丹
高振伟
杨夏祎
黄吕超
胡源源
张重阳
张国一
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State Grid Information and Telecommunication Co Ltd
Beijing Guodiantong Network Technology Co Ltd
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State Grid Information and Telecommunication Co Ltd
Beijing Guodiantong Network Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302—Overcharge protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306—Overdischarge protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Stand-By Power Supply Arrangements (AREA)

Abstract

The utility model provides a switch controller back-up power supply system on post is fused to a secondary, includes primary switch, adjustable stream steady voltage unit, charge-discharge management unit and two back-up power supply units. The primary switch acquires 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 input into the charging and discharging management unit. The charge and discharge management unit is electrically connected with the double backup power supplies, monitors the working states of the double backup power supplies in real time, and calculates the residual working electric quantity and the residual time of the double backup power supplies so as to execute a backup power supply scheme. The utility model provides a double backup power supply, which can realize multiple combination forms of backup power supply schemes by controlling the switching on and off of the double backup power supply; the double backup power supplies can instantly provide a great current, and the problem that a single backup power supply system is insufficient in instant current output capability is solved; and one set of hardware can adapt to DC grades of various specifications.

Description

One-time and two-time fusion post-standby power supply system of on-pole switch controller
Technical Field
The utility model relates to a reserve electrical power generating system technical field especially relates to a one secondary fuses pole-mounted switch controller back-up electrical power generating system.
Background
With the proposal of carbon peak reaching and carbon neutralization targets, the power system in China is developed vigorously for green energy transformation, a novel power system is produced under the situation, and the construction and the transformation of a power distribution network are important links of the novel power system. The arrangement of the intelligent terminal of the power distribution network is increased, the observability, the testability and the controllability of the novel infrastructure of the source network load storage are improved, and the method is an urgent need of a novel power system. The power distribution network equipment technology integrating primary and secondary power distribution is an effective means for improving the level of power distribution equipment and is also an important symbol for achieving achievement of intelligent power distribution network construction in novel power systems in China.
The switch on post is fused to a secondary adopts electronic type AC sensor encapsulation in utmost point post or installs in the box, along with secondary side controller low-power consumption, miniaturization and modularization development, the primary equipment is pressed close to secondary equipment, and the integration degree of switch further improves. The primary and secondary fusion column switch is composed of a switch body, a controller, a connecting cable and the like, and the controller mainly has the functions of collecting the electric quantity of the primary switch and controlling the opening and closing of the switch. The primary switch is internally provided with a direct current electric mechanism, the primary switch is driven by direct current provided by the controller, and switching-on and switching-off control of the switch can be performed under the condition of existence or nonexistence of alternating current so as to realize related functions of feeder automation, therefore, the quality of a backup power supply system of the controller is of great importance.
A common primary and secondary fusion column switch controller generally adopts a lead-acid storage battery or a lithium battery as a backup power supply, the lead-acid storage battery has the problems of short service life and pollution, and the lithium battery has the conditions of insufficient output capacity and insufficient protection method for the lithium battery although the lithium battery has long service life and is safer.
Therefore, a backup power system for a secondary fusion column switch controller with lithium battery protection function and large current output capability is needed.
Disclosure of Invention
In view of this, the present disclosure provides a secondary power supply system with a post-power controller integrated in a post switch.
Based on above-mentioned purpose, this disclosure provides a switch controller back-up power supply system on a secondary fusion post, includes:
a primary switch configured to obtain electric energy and output the electric energy;
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 charging and discharging management unit is respectively electrically connected with the primary switch and the adjustable current voltage stabilizing unit, is configured to receive the direct current output by the adjustable current voltage stabilizing unit, controls the primary switch, and selects a corresponding backup power scheme to supply power to the system according to a preset power supply principle;
and the double backup power supply unit is electrically connected with the charging and discharging management unit and is configured to supply power to the system under the condition of power failure, the charging and discharging management unit is utilized to monitor the working state of the system in real time, calculate the residual working electric quantity and the residual working time of the system and execute the backup power supply scheme.
Further, the primary switch comprises a capacitance electricity taking device and a direct current electric device;
the capacitance 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 perform voltage reduction processing on the electric energy by using a capacitor;
the direct current electric device is electrically connected with the charging and discharging management unit and is configured to control the opening and closing of the primary switch according to the monitoring result of the charging and discharging management unit.
Further, 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 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 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 a control signal fed back by the charge and discharge management unit.
Further, the measurement and control switch D1 and the measurement and control switch D2 respectively comprise a switch body, a voltage measuring loop and a current measuring loop,
wherein 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 the working state of the lithium battery pack and the super capacitor pack.
Further, the monitoring of the working state of the dual backup power supply unit in real time and the calculation of the remaining working capacity and the remaining working time thereof include:
it is right super capacitor group monitors, through observe and control switch D2 collection super capacitor group's voltage and current data transmit charge and discharge management unit, via charge and discharge management unit calculates surplus operating power and surplus operating time, surplus operating power computational formula is:
Figure BDA0003602120970000031
wherein Q is the residual working electric quantity, C is the capacitance of the super capacitor bank, V0 is the initial discharge voltage of the capacitance, 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 bank is as follows:
Figure BDA0003602120970000032
wherein T is the residual working time of the super capacitor bank, Q is the residual working electric quantity, and I is the discharge current.
Further, the preset power supply principle includes:
in response to powering the DC powered device, drawing power from the primary switch,
and responding to the situation that the electric energy obtained by the primary switch is insufficient, and obtaining the electric energy from the double backup power supply units according to the backup power supply scheme.
Further, the backup power scheme includes: the system comprises a single lithium battery pack power supply scheme, a single super capacitor pack power supply scheme and a double backup power supply scheme.
Further, the selecting a corresponding backup power scheme according to a preset power supply principle to supply power to the system includes:
and responding to the situation that the electric energy obtained by the primary switch is insufficient, selecting a single super capacitor bank power supply scheme, a single lithium battery pack power supply scheme or a double backup power supply scheme, and respectively controlling the lithium battery pack or the super capacitor bank to supply power through the charge and discharge management unit.
Further, the selecting a corresponding backup power scheme according to a preset power supply principle to supply power to the system further includes:
responding to a frequently-operated switch under the condition of no AC power outage, selecting a single super capacitor bank power supply scheme or a double backup power supply scheme, and controlling the super capacitor bank or the lithium battery pack to supply power through the charge and discharge management unit;
and responding to the working requirement of the system, namely long-time cruising with low current, 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 and discharge management unit.
Further, the selecting a corresponding backup power scheme according to a preset power supply principle to supply power to the system further includes:
responding to the situation that the electric energy obtained by the primary switch is insufficient and the electric quantity of the super capacitor bank is sufficient, selecting a double-backup power supply scheme, and controlling the super capacitor bank to supply power through the charge and discharge management unit;
and responding to the situation that the electric energy obtained by the primary switch is insufficient and the electric quantity of the super capacitor bank is insufficient, selecting a double-backup power supply scheme, and controlling the lithium battery bank to supply power through the charging and discharging management unit.
From the above, it can be seen that the backup power supply system of the primary-secondary fusion column switch controller provided by the present disclosure includes a primary switch, an adjustable current voltage stabilization unit, a charge and discharge management unit, and a dual backup power supply unit. The primary switch acquires 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 input into the charging and discharging management unit. The charge and discharge management unit is electrically connected with the double backup power supplies, monitors the working states of the double backup power supplies in real time, and calculates the residual working electric quantity and the residual time of the double backup power supplies so as to execute a backup power supply scheme. The utility model provides a double backup power supply, which can realize backup power supply schemes in various combination forms by controlling the switching on and off of the double backup power supply; the double backup power supplies can provide extremely large current instantly, the problem that a single backup power supply system is insufficient in instant current output capacity is solved, and one set of hardware can adapt to direct current grades of various specifications.
Drawings
In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a secondary fusion post-power supply system of a post-column switch controller according to an embodiment of the disclosure;
FIG. 2 is a schematic diagram of a conventional primary and secondary fusion post-column power supply system;
fig. 3 is a schematic diagram of a preset power supply principle according to an embodiment of the disclosure;
FIG. 4 is a schematic diagram of a backup power scheme according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a power supply sequence of a dual backup power scheme according to an embodiment of the disclosure.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
It is to be noted that technical terms or scientific terms used in the embodiments of the present disclosure should have a general meaning as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
As described in the background art, a common primary and secondary fusion column switch controller generally uses a lead-acid battery or a lithium battery as a backup power supply. The primary equipment and the secondary equipment in the power system contain part of secondary equipment intelligent units, so that the primary equipment is more intelligent and has the functions of measurement, metering, secondary protection, monitoring, control and the like. High-voltage primary equipment is close to or even fuses with secondary equipment, and primary equipment is located the high-voltage line, and secondary equipment is located low pressure one side, does not have the safety risk, the manual operation of being convenient for.
Although the lead-acid storage battery can discharge with large current and is suitable for most controllers, the lead-acid storage battery has higher pollution and short service life, and the controller with the requirement of large-current discharge operation can cause switch failure due to battery aging. Combine the urgent demand of the green transition of novel electric power system energy, green pollution-free lithium cell accords with market more. The lithium battery has large capacity and small volume, is environment-friendly, and has the main advantages compared with a lead-acid storage battery: the monomer voltage is high, the energy density is high, and the use space can be effectively reduced; the cycle life can reach more than 2000 times, and the cycle life of a common lead-acid storage battery is 300-500 times; high temperature resistance and safe use; low self-discharge rate, no memory effect, and can be used as required.
The existing one-time and two-time integrated post-switch controller standby power supply system mostly depends on a single lithium battery pack for power supply. However, there are also some drawbacks to the single lithium battery supply: although the charging and discharging protection circuit can prevent the damage of overcharge and overdischarge to the lithium battery, the lithium battery still generates heat seriously under the condition of working under a strong load current for a long time, and influences the service life and the available capacity of the lithium battery, so the lithium battery can not be used for operating large-current discharge of a loop for a long time; the lithium battery has higher requirements on a charging loop, needs to protect a control circuit and cannot float, otherwise, the battery is easy to cause battery faults due to overcharge and overdischarge.
The existing power supply system of the backup lithium battery of the primary and secondary fusion column switch controller generally provides fixed-grade direct current power supply according to the specification of the lithium battery, such as DC24V and DC 48V. Once the specification of the lithium battery is determined, the hardware system is fixed, the level of the direct current voltage provided by the lithium battery is fixed, compatible interchange of the DC24V and DC48V battery packs is not generally supported, and unexpected damage can be brought to the hardware system when the battery packs of different levels are connected in error.
The primary and secondary post-power supply system with the integrated on-column switch controller mainly refers to a system with a lithium battery as a backup power supply, relevant technical analysis and improvement are carried out on the system according to the technical scheme, and a lithium battery pack and a super capacitor pack double-backup power supply system are formed by adding the super capacitor pack. The super capacitor is not limited by discharge current, and can instantly provide great current, so that the problem of insufficient instant current output capability of a single backup power supply system is solved; meanwhile, the auxiliary power supply branch of the super capacitor bank of the double-backup power supply system can effectively deal with instantaneous large current impact and share load current, provides buffering and protection effects for the lithium battery, can deal with frequent charging and discharging conditions caused by frequent operation of a switch, and prolongs the service life of the battery.
Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The invention provides a backup power supply system of a primary and secondary fusion column switch controller, which comprises:
a primary switch configured to obtain electric energy and output the electric energy; the primary switch is a switch body of the primary and secondary fusion column switch, and external equipment of the primary switch is primary equipment including but not limited to a generator, a transformer, a bus, a transmission line, a power cable, an electric reactor, a motor and the like.
And 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 rectifier circuit has the task of converting alternating current with positive and negative polarity into direct current with unidirectional pulsation by utilizing the unidirectional conductivity of the diode, and further optionally, a filter circuit is connected to the output end of the rectifier circuit in the embodiment, so that alternating current components can be filtered, and smooth direct current voltage can be obtained; the voltage after rectification and filtering is unstable, and when the voltage of a power grid or a load changes, the voltage changes, and the ripple voltage is large, so that the output voltage can be stable and unchanged within a certain range only by a voltage stabilizing circuit after rectification and filtering. Further optionally, a resonant voltage type double-loop control resonant switching power supply technology is selected, and the resonant switching power supply has the characteristics of high voltage stabilization precision and fast dynamic response.
And the charging and discharging management unit is respectively electrically connected with the primary switch and the adjustable current voltage stabilizing unit, is configured to receive the direct current output by the adjustable current voltage stabilizing unit, controls the primary switch, and selects a corresponding backup power scheme to supply power to the system according to a preset power supply principle.
And the double backup power supply unit is electrically connected with the charging and discharging management unit and is configured to supply power to the system under the condition of power failure, the charging and discharging management unit is utilized to monitor the working state of the system in real time, calculate the residual working electric quantity and the residual working time of the system and execute the backup power supply scheme.
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 voltage 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 fig. 1, the charging and discharging management unit is externally connected with a main control unit in addition to the adjustable current voltage stabilizing unit, the primary switch and the dual backup power supply unit.
Further, the primary switch comprises a capacitance power taking device and a direct current electric device.
The capacitance 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 perform voltage reduction processing on the electric energy by using a capacitor. Further optionally, the capacitance power taking device limits the maximum working current by using a capacitive reactance generated by a capacitance under a certain alternating current signal frequency, so as to play a role in voltage reduction. Further optionally, in this embodiment, the capacitor is immersed in nonpolar iron shells.
The direct current electric device is electrically connected with the charging and discharging management unit and is configured to control the opening and closing of the primary switch according to the monitoring result of the charging and discharging management unit. The electric operating mechanism of the primary-secondary fusion column switch preferentially uses the electric energy taken from the primary switch.
The pole-mounted switch is commonly provided with a pole-mounted breaker, a pole-mounted load switch and a pole-mounted isolating switch, and the primary switch direct-current electric mechanism of the pole-mounted load switch is commonly provided with different specifications such as DC24V and DC 48V. The inside of the primary switch is provided with a direct current electric mechanism which is driven by direct current provided by the controller, and the switch can be controlled to be switched on and off under the condition of the existence or non-existence of alternating current, so that the related functions of feeder automation are realized.
In some embodiments, the dual backup power unit comprises a lithium battery pack, a measurement and control switch D1, a super capacitor pack, a measurement and control switch D2; the measurement and control switch D1 is respectively 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 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 a control signal fed back by the charge and discharge management unit.
Lithium cell group and two reserve electrical power generating system of super capacitor group have had lithium cell and super capacitor's advantage concurrently, can solve the problem that single lithium cell group power supply received the upper limit restriction of discharge current, can provide very big direct current output in the twinkling of an eye, have solved but reserve electrical power generating system current output ability not enough in the twinkling of an eye problem.
The super capacitor is an electrochemical element, but does not have chemical reaction during the energy storage process. The energy storage process is reversible, and the super capacitor can be repeatedly charged and discharged for tens of thousands of times, so that the super capacitor has the advantages of extremely high efficiency, high current capacity, wide voltage range, wide use temperature range, long rewinding service life, long working life, no maintenance, easy maintenance, simple integration, low cost and the like. The working voltage of the super capacitor monomer is not high and is only 1V-4V generally, and a plurality of super capacitor monomers are connected in series to obtain the super capacitor group, so that the requirement of higher working voltage can be met.
The charging and discharging protection circuit in the lithium battery can prevent the harm to the lithium battery caused by overcharge and overdischarge, but because the internal resistance of the lithium battery is large, the lithium battery can seriously generate heat when working under strong negative current for a long time, the service life and the available capacity of the lithium battery are influenced, and an auxiliary power supply branch circuit provided by the super capacitor bank can provide buffering and protection effects for the lithium battery and effectively share load current.
Further alternatively, the present embodiment uses a super capacitor bank rated at a high voltage level above 48V, and since the super capacitor bank can also carry a charge level of 24V since the charge level stored by the super capacitor bank is the product of its voltage and the farad value of the capacitor, a bank of super capacitors can store a charge level compatible with both voltage specifications. When lithium battery packs with different voltage levels are replaced, the super capacitor bank does not need to be replaced, and one set of hardware is suitable for direct current levels with various specifications.
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 real-time voltage and current of the lithium battery pack and the super capacitor pack, and the switch body is configured to control the operating state of the lithium battery pack and the super capacitor pack.
In some embodiments, the monitoring the operating state of the dual backup power unit in real time and calculating the remaining operating power and the remaining operating time thereof includes:
it is right super capacitor group monitors, through observe and control switch D2 collection super capacitor group's voltage and current data transmit charge and discharge management unit, via charge and discharge management unit calculates surplus operating power and surplus operating time, surplus operating power computational formula is:
Figure BDA0003602120970000081
wherein Q is the residual working electric quantity, the unit coulomb, C is the capacitance of the super capacitor group, and the unit farad; v0 is the initial voltage of capacitor discharge in volt; vs is the discharge cutoff voltage set by the system, in volts; i is discharge current in ampere; t is time, in seconds.
Further alternatively, in order to calculate the amount of discharged charge from the start of discharge to the measurement time t, the patent adopts an ampere-hour integration method, which is also adopted when calculating the amount of discharged charge of the lithium battery pack from the start of discharge to the measurement time t.
The ampere-hour integration method comprises the following steps:
firstly, sampling discharge current for 2 times per second or more;
secondly, calculating the second average value of the discharge current;
and thirdly, accumulating the average current value every second from the beginning of discharging to the measurement time t, wherein the obtained value is the discharging charge quantity calculated by the ampere-hour integration method.
And calculating the residual charge Q after the discharge charge quantity from the beginning of discharge to the measurement time t is calculated, and calculating the residual working time of the super capacitor by combining the current discharge current I.
The remaining working time of the super capacitor bank is as follows:
Figure BDA0003602120970000091
wherein T is the residual working time of the super capacitor bank, Q is the residual working electric quantity, and I is the discharge current.
The calculation method can prejudge the input and exit time of the super capacitor bank, and is beneficial to the charging and discharging management unit to realize an accurate control strategy.
In some embodiments, referring to fig. 3, the preset power supply principle includes:
in response to powering the DC powered device, drawing power from the primary switch,
and responding to the situation that the electric energy obtained by the primary switch is insufficient, and obtaining the electric energy from the double backup power supply units according to the backup power supply scheme.
In some embodiments, referring to fig. 4, the backup power scheme comprises: the system comprises a single lithium battery pack power supply scheme, a single super capacitor pack power supply scheme, a double backup power supply scheme and three backup power supply system schemes, and can be used according to actual working conditions.
Referring to a backup power supply system of a primary and secondary fusion column switch controller in an embodiment of the disclosure in fig. 1 and a backup power supply system of a conventional primary and secondary fusion column switch controller in fig. 2, a main improvement measure of the embodiment of the disclosure is to change a backup power supply of a single lithium battery pack into a dual power backup system, add a super capacitor pack as an auxiliary backup power supply, and add a measurement and control switch D1 and a measurement and control switch D2 which can be independently operated between two backup power supplies and a charge and discharge management unit respectively. When different power supply schemes are selected according to specific working conditions, the switching on and switching off of the measurement and control switch D1 and the measurement and control switch D2 in the figure 1 are controlled, and then the following different power supply schemes can be selected.
In some embodiments, referring to fig. 4, the selecting a corresponding backup power scheme according to a preset power supply principle to supply power to the system includes:
and responding to the situation that the electric energy obtained by the primary switch is insufficient, selecting a single super capacitor bank power supply scheme, a single lithium battery pack power supply scheme or a double backup power supply scheme, and respectively controlling the lithium battery pack or the super capacitor bank to supply power through the charge and discharge management unit.
Referring to fig. 4, when the primary switch obtains insufficient electric energy, a single super capacitor bank power supply scheme, a lithium battery bank power supply scheme and a dual backup power supply scheme may be selected. When a double-backup power supply scheme is selected, the measurement and control switch D1 and the measurement and control switch D2 are closed, and at the moment, the super capacitor bank and the lithium battery bank supply power together. Further, a single lithium battery pack power supply scheme and a single super capacitor pack power supply scheme can be selected.
In some embodiments, referring to fig. 4, the selecting a corresponding backup power scheme according to a preset power supply principle to supply power to the system further includes:
responding to a frequently-operated switch under the condition of no AC power outage, selecting a single super capacitor bank power supply scheme or a double backup power supply scheme, and controlling the super capacitor bank or the lithium battery pack to supply power through the charge and discharge management unit;
and responding to the working requirement of the system, namely long-time cruising with low current, 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 and discharge management unit.
Although super capacitor's capacity is less than the lithium cell, the charge-discharge circuit design is simple, and the charge speed is very fast, can also deal with the impact of heavy current discharge, and super capacitor long service life, no memory is fit for the power supply condition in short-term after having a power failure, consequently, when meeting the frequent charge-discharge condition that frequently operation switch brought under the circumstances of having a power failure, the preferred selection single super capacitor group power supply scheme, measurement and control switch D1 is opened, measurement and control switch D2 is closed, by this moment super capacitor group is the system power supply. Further optionally, a dual backup power scheme may also be selected.
When the primary switch obtains insufficient electric energy or the working requirement of the system is low current and long-time endurance, a single lithium battery pack power supply scheme is preferably selected, the measurement and control switch D2 is opened, the measurement and control switch D1 is closed, and the lithium battery pack supplies power to the system. The lithium battery has the advantages of high single voltage and high energy density, and can be used for the controller to continuously and stably work for hours under the condition of alternating current power failure. Further optionally, a dual backup power scheme may also be selected.
In some embodiments, the selecting a corresponding backup power scheme according to a preset power supply principle to supply power to the system further includes:
responding to the situation that the electric energy obtained by the primary switch is insufficient and the electric quantity of the super capacitor bank is sufficient, selecting a double-backup power supply scheme, and controlling the super capacitor bank to supply power through the charge and discharge management unit;
and responding to the situation that the electric energy obtained by the primary switch is insufficient and the electric quantity of the super capacitor bank is insufficient, selecting a double-backup power supply scheme, and controlling the lithium battery bank to supply power through the charging and discharging management unit.
In this embodiment, the power supply sequence of the double backup power supply scheme is as shown in fig. 5, when the primary switch obtains insufficient electric energy and the super capacitor bank has sufficient electric quantity, the double 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 charge and discharge management unit preferentially selects the super capacitor bank to supply power; when the primary switch obtains that the electric energy is not enough and the electric energy of the super capacitor group is not enough, the double backup power supply scheme is selected, and at the moment, the charging and discharging management unit automatically selects the lithium battery group for power supply. Thus, a dual backup power supply is also advantageous in that when one of the backup power supplies is short of power, the other backup power supply can be timely powered.
It should be noted that, referring to fig. 1, in the embodiment of the present disclosure, the monitoring function of the system by the charging and discharging unit may be independently completed by a chip in the charging and discharging unit, or may be assisted by a main control unit externally connected to the charging and discharging management unit.
It should be noted that the above describes some embodiments of the disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the present disclosure, also technical features in the above embodiments or in different embodiments may be combined, 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 brevity.
In addition, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown in the provided figures for simplicity of illustration and discussion, and so as not to obscure the embodiments of the disclosure. Furthermore, devices may be shown in block diagram form in order to avoid obscuring embodiments of the present disclosure, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the embodiments of the present disclosure are to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be apparent to one skilled in the art that the embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other primary and secondary fused pole switch configurations (e.g., circuit breakers, reclosers, sectionalizers) may use the discussed embodiments.
The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made within the spirit and principles of the embodiments of the disclosure are intended to be included within the scope of the disclosure.

Claims (10)

1. A secondary fuses pole top switch controller reserve electrical power generating system which characterized in that includes:
a primary switch configured to obtain electric energy and output the electric energy;
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 charging and discharging management unit is respectively electrically connected with the primary switch and the adjustable current voltage stabilizing unit, is configured to receive the direct current output by the adjustable current voltage stabilizing unit, controls the primary switch, and selects a corresponding backup power scheme to supply power to the system according to a preset power supply principle;
and the double backup power supply unit is electrically connected with the charging and discharging management unit and is configured to supply power to the system under the condition of power failure, the charging and discharging management unit is utilized to monitor the working state of the system in real time, calculate the residual working electric quantity and the residual working time of the system and execute the backup power supply scheme.
2. The system of claim 1, wherein the primary switch comprises a capacitive power take and a dc power device;
the capacitance 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 perform voltage reduction processing on the electric energy by using a capacitor;
the direct current electric device is electrically connected with the charging and discharging management unit and is configured to control the opening and closing of the primary switch according to the monitoring result of the charging and discharging management unit.
3. The system of claim 1, wherein the dual backup power unit comprises a lithium battery pack, a measurement and control switch D1, a super capacitor pack, a measurement and control switch D2;
the measurement and control switch D1 is respectively 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 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 a control signal fed back by the charge and discharge management unit.
4. The system of claim 3, wherein the measurement and control switch D1 and the measurement and control switch D2 each include a respective switch body, a voltage measurement loop, a current measurement loop,
wherein 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 the working state of the lithium battery pack and the super capacitor pack.
5. The system of claim 3, wherein monitoring the operating status of the dual backup power unit in real time and calculating the remaining operating capacity and the remaining operating time thereof comprises:
it is right super capacitor group monitors, through observe and control switch D2 collection super capacitor group's voltage and current data transmit charge and discharge management unit, via charge and discharge management unit calculates surplus operating power and surplus operating time, surplus operating power computational formula is:
Figure FDA0003602120960000021
wherein Q is the residual working electric quantity, C is the capacitance of the super capacitor bank, V 0 The discharge starting voltage of the capacitor, Vs the discharge cut-off voltage set by the system, I the discharge current and t the time;
the remaining working time of the super capacitor bank is as follows:
Figure FDA0003602120960000022
wherein T is the residual working time of the super capacitor bank, Q is the residual working electric quantity, and I is the discharge current.
6. The system of claim 1, wherein the predetermined power supply rules comprise:
in response to powering the DC powered device, drawing power from the primary switch,
and responding to the situation that the electric energy obtained by the primary switch is insufficient, and obtaining the electric energy from the double backup power supply units according to the backup power supply scheme.
7. The system of claim 1, wherein the backup power scheme comprises: the system comprises a single lithium battery pack power supply scheme, a single super capacitor pack power supply scheme and a double backup power supply scheme.
8. The system of claim 7, wherein the selecting the corresponding backup power scheme according to the preset power supply principle to supply power to the system comprises:
and responding to the situation that the electric energy obtained by the primary switch is insufficient, selecting a single super capacitor bank power supply scheme, a single lithium battery pack power supply scheme or a double backup power supply scheme, and respectively controlling the lithium battery pack or the super capacitor bank to supply power through the charge and discharge management unit.
9. The system of claim 7, wherein the selecting a corresponding backup power scheme to power the system according to a preset power supply principle further comprises:
responding to a frequently-operated switch under the condition of no AC power outage, selecting a single super capacitor bank power supply scheme or a double backup power supply scheme, and controlling the super capacitor bank or the lithium battery pack to supply power through the charge and discharge management unit;
and responding to the working requirement of the system, namely long-time cruising with low current, 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 and discharge management unit.
10. The system of claim 7, wherein the selecting a corresponding backup power scheme to power the system according to a preset power supply principle further comprises:
responding to the situation that the electric energy obtained by the primary switch is insufficient and the electric quantity of the super capacitor bank is sufficient, selecting a double-backup power supply scheme, and controlling the super capacitor bank to supply power through the charge and discharge management unit;
and responding to the situation that the electric energy obtained by the primary switch is insufficient and the electric quantity of the super capacitor bank is insufficient, selecting a double-backup power supply scheme, and controlling the lithium battery bank to supply power through the charging and discharging management unit.
CN202210415480.2A 2022-04-18 2022-04-18 One-time and two-time fusion post-standby power supply system of on-pole switch controller Pending CN114884200A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116111722A (en) * 2023-02-20 2023-05-12 北京昊创瑞通电气设备股份有限公司 Secondary deep fusion low-power-consumption power distribution automatic terminal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116111722A (en) * 2023-02-20 2023-05-12 北京昊创瑞通电气设备股份有限公司 Secondary deep fusion low-power-consumption power distribution automatic terminal

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