CN115765025A - Distributed power supply management system - Google Patents
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Abstract
The invention discloses a distributed power management system which is arranged in a converter station and comprises an alternating current distribution control unit, a conversion integration unit, a direct current distribution control unit, a storage battery patrol instrument, an edge controller and a monitoring platform, wherein the alternating current distribution control unit is connected with the alternating current distribution control unit; the output end of the alternating current distribution control unit is respectively the input end of the direct current distribution control unit and the input end of the conversion integrated unit and is used for converting three-phase alternating current into direct current; the output end of the direct current distribution control unit is electrically connected with a direct current bus; the output end of the conversion integration unit is used as the person output end of the direct current distribution control unit and used for charging the storage battery pack; the storage battery polling instrument, the alternating current distribution control unit, the conversion integration unit and the direct current distribution control unit are controlled by the edge controller; the storage battery patrol instrument is used for checking the capacity of the storage battery pack; the edge controller is used for receiving a test and monitoring instruction of the monitoring platform, and the monitoring platform is used for monitoring the state of each device of the converter station. The scheme can assist accurate regulation and control of electric power, and the efficiency of electric power remote monitoring and remote regulation and control is obviously improved.
Description
Technical Field
The invention relates to the technical field of electric power regulation and control, in particular to a distributed power management system.
Background
At present, a direct current system of a 500kV station adopts centralized arrangement, a storage battery pack in the system achieves DC110V voltage through series connection of 54 2V storage batteries, is connected with an output end of a charging unit in parallel on a direct current bus, and provides a direct current power supply with stable reliability for a direct current load through a direct current feeder switch; the storage battery pack of the series direct-current power supply system has the main problems that: the storage batteries are connected in series, so that the reliability is not high; the single battery fault causes the whole storage battery pack to be incapable of outputting, the direct current bus has the risk of open circuit, new and old batteries cannot be used in a mixed mode, and the system reliability is difficult to guarantee. The series storage battery pack with large nuclear capacity maintenance workload can not be maintained on line and is subjected to nuclear capacity verification only in a manual mode, a transformer substation is mostly unattended, and the storage battery is large in operation and maintenance workload, long in time consumption and inconvenient to operate and maintain. According to the requirements of the operation regulation of the DL/T724 storage battery, the storage battery pack needs to be checked for capacity according to the discharge rate of 0.1C, manual on-site discharge is carried out, when the capacity of the storage battery pack needs to be calculated for 10 hours, the storage battery needs to be charged after the discharge is finished, the whole process of checking for capacity needs more than 20 hours, and a large amount of manpower is consumed by checking for capacity through direct current in a station. The conventional direct current system needs to be provided with a nuclear receiving and charging instrument when the storage battery is used for capacity checking, the instrument consumes energy of the storage battery in a heating mode, and for example, a 110V/500Ah battery pack is taken as an example, 110V × 500Ah = 55000Val is lost in one capacity checking, namely 55 degrees of electricity is lost. When the conventional direct current system is used for a 500kV station, if the conventional direct current system is used in a partitioned distributed direct current system scene, 54 2V storage batteries need to be configured in series for one section of the direct current bus storage battery pack in each region to reach DC110V voltage, and the 500kV station requires direct current double bus arrangement, so that the number of the whole used batteries is large.
The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to solve the technical problem that the existing distributed power supply is difficult to remotely monitor and remotely regulate, and provides a distributed power supply management system.
The technical scheme provided by the embodiment of the invention is that the distributed power management system is arranged in a converter station and comprises an alternating current distribution control unit, a conversion integration unit, a direct current distribution control unit, a storage battery patrol instrument, an edge controller and a monitoring platform; the output end of the alternating current distribution control unit is respectively the input end of the direct current distribution control unit and the input end of the conversion integrated unit and is used for converting three-phase alternating current into direct current; the output end of the direct current distribution control unit is electrically connected with the direct current bus and used for direct current output regulation and control; the output end of the conversion integration unit is used as the person conveying end of the direct current distribution control unit and used for charging the storage battery pack; the storage battery polling instrument, the alternating current distribution control unit, the conversion integrated unit and the direct current distribution control unit are all controlled by the edge controller; the storage battery patrol instrument is used for checking the capacity of the storage battery pack; the edge controller is used for receiving the testing and monitoring instructions of the monitoring platform, and the monitoring platform is used for monitoring the states of all equipment of the converter station.
Preferably, the conversion integrated unit comprises a plurality of conversion integrated sub-units arranged in parallel, and the plurality of conversion integrated sub-units are mutually primary and standby.
Preferably, the conversion integrated subunit includes a first DC/DC converter, a second DC/DC converter and a storage battery pack, the first DC/DC converter is used for converting an output power of the ac distribution control unit into a charging power of the storage battery pack, the second DC/DC converter is used for converting an output power of the storage battery pack into a power supply of the DC bus, and both the first DC/DC converter and the second DC/DC converter are controlled by the edge controller.
Preferably, the edge controller comprises a timer, an inspection coding table and an inspection instruction library, wherein the inspection coding table corresponds to the serial number of the storage battery pack, the timer is used for setting the capacity checking period of the storage battery pack, the inspection instruction library is linked with the timer, the storage battery state test and state acquisition are carried out according to the capacity checking period of the timer, and the storage battery inspection instrument receives the operation instruction information of the inspection instruction library to carry out storage battery capacity checking.
Preferably, the edge controller further comprises a comparison unit and a storage unit, wherein the storage unit stores the storage battery state test information and the state values acquired according to the inspection cycle; the comparison unit sequentially calls the storage battery state test information and the state value to compare with the corresponding storage battery state test information and the corresponding state value, and if the deviation of the comparison value is greater than a set value, the state test information and the state value of the corresponding storage battery are sent to the monitoring platform; if the deviation of the comparison value is within the normal range, the state test information and the state value of the corresponding storage battery are deleted from the storage unit.
Preferably, the method for sending the state test information and the state value of the corresponding storage battery to the monitoring platform comprises the following steps:
acquiring a routing inspection coding table, if the state value detected by the storage battery is abnormal, assigning 1 to the corresponding coding bit in the routing inspection coding table, and if the state value detected by the storage battery is normal, assigning 0 to the corresponding coding bit in the routing inspection coding table to generate a state truth table; and sending the state truth table to the monitoring platform.
Preferably, the inspection instruction base comprises a plan inspection instruction base and an unplanned inspection instruction base, and the plan inspection instruction base stores the triggering time and the inspection time corresponding to each storage battery inspection task; and the unplanned inspection instruction library is used for receiving the inspection instruction of the monitoring platform and performing inspection on the state of the corresponding storage battery according to the phased inspection code.
Preferably, the DC distribution control unit includes a third DC/DC converter and a switching unit, an input port of the switching unit is controlled by a power electronic switching device, and the power electronic switching device performs logic control according to a coded address of the storage battery; the third DC/DC converter is used for converting the output power supply of the alternating current distribution control unit into the power supply of the direct current bus, and the third DC/DC converter is controlled by the edge controller.
Preferably, the power electronic switching device performs logic control according to the coded address of the storage battery, and includes: the third DC/DC converter does not receive the output power supply signal of the alternating current distribution control unit, the edge controller acquires a state truth table of the storage battery, and acquires a corresponding normal storage battery and a corresponding coding address thereof according to the state truth table;
and the edge controller performs power electronic switching action according to the coded address, so that a normal storage battery is used as a power supply of the direct-current bus.
Preferably, the method further comprises the following steps: the edge controller monitors the power output value of the normal storage battery in real time; and if the power output value of the normal storage battery is smaller than the rated operation value of the direct current bus, the edge controller acquires the normal storage battery adjacent to the current storage battery as the power supply of the direct current bus according to the state truth table.
The invention has the beneficial effects that: according to the distributed power management system, the storage battery packs which are connected in parallel are mutually main and standby, so that the normal operation of a direct-current bus can be ensured when an alternating-current side fails, meanwhile, the edge server is arranged and used for monitoring and analyzing the state of the storage battery in real time, assisting in accurate regulation and control of electric power, and remarkably improving the effects of remote monitoring and remote regulation and control of electric power; by setting the power polling table, active polling can be performed according to the polling table and the corresponding polling period, polling results are analyzed and compared, the code addresses of abnormal storage batteries are arranged to obtain a state truth table, and a monitoring platform can position the corresponding storage battery pack according to the state truth table, so that the positioning accuracy and efficiency are improved; secondly, the passive inspection can be carried out according to the abnormal power supply information of the direct current bus received by the monitoring platform, the normal storage battery pack can be locked quickly, and the running stability of the direct current bus can be guaranteed by regulating and controlling the normal storage battery pack to participate in power supply.
The above summary of the present invention is merely an overview of the technical solutions of the present invention, and the present invention can be implemented in accordance with the content of the description in order to make the technical means of the present invention more clearly understood, and the above and other objects, features, and advantages of the present invention will be more clearly understood.
Drawings
Other features, objects and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments thereof, which proceeds with reference to the accompanying drawings. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings.
Fig. 1 is a schematic structural diagram of a distributed power management system according to the present invention.
The notation in the figure is: the system comprises a 1-alternating current distribution control unit, a 2-conversion integrated unit, a 3-direct current distribution control unit, a 4-storage battery polling instrument, a 5-edge controller, a 6-monitoring platform and a 21-storage battery pack.
Detailed Description
For the purpose of better understanding the objects, technical solutions and advantages of the present invention, the following detailed description of the present invention with reference to the accompanying drawings and examples should be understood that the specific embodiment described herein is only a preferred embodiment of the present invention, and is only used for explaining the present invention, and not for limiting the scope of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without making creative efforts shall fall within the scope of the present invention.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations (or steps) can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure; the processes may correspond to methods, functions, procedures, subroutines, and the like.
Example (b): as shown in fig. 1, a distributed power management system is disposed in a converter station, and includes an ac distribution control unit 1, a conversion integration unit 2, a dc distribution control unit 3, a storage battery polling instrument 4, an edge controller 5, and a monitoring platform 6; the output end of the alternating current distribution control unit is respectively the input end of the direct current distribution control unit and the input end of the conversion integrated unit and is used for converting three-phase alternating current into direct current; the output end of the direct current distribution control unit is electrically connected with a direct current bus and used for direct current output regulation and control; the output end of the conversion integration unit is used as the person conveying end of the direct current distribution control unit and used for charging the storage battery pack 21; the storage battery polling instrument, the alternating current distribution control unit, the conversion integrated unit and the direct current distribution control unit are all controlled by the edge controller; the storage battery patrol instrument is used for checking the capacity of the storage battery pack; the edge controller is used for receiving the testing and monitoring instructions of the monitoring platform, and the monitoring platform is used for monitoring the states of all equipment of the converter station.
In this embodiment, the input of the ac distribution control unit is ac, for example, the input may be 2-way three-phase ac power supply (three-phase five-line), where one way may be automatically switched to the other way to input power when a fault occurs, and when both ways of power supply have a fault, the storage battery is required to participate in power supply; for example, the DC bus voltage needs DC110V, and normally, the edge controller controls the ac distribution control unit and the DC distribution control unit to convert the ac power into DC110V; when two power supplies are failed, the output voltage of the storage battery pack is regulated into DC110V for power supply through the control conversion integrated unit; the storage battery patrol instrument can detect the state value of the storage battery according to the active instruction and the passive instruction, perform necessary protection and report related states and alarm information to the monitoring platform.
The conversion integrated unit comprises a plurality of conversion integrated subunits which are arranged in parallel, and the conversion integrated subunits are mutually primary and standby.
It can be understood that the conversion integrated subunits are arranged in parallel, and the conversion integrated subunits are electrically isolated and can be independently controlled and independently charged and discharged, so that the robustness of the distributed power management system is ensured.
The conversion integrated subunit comprises a first DC/DC converter, a second DC/DC converter and a storage battery pack, the first DC/DC converter is used for converting an output power supply of the alternating current distribution control unit into a charging power supply of the storage battery pack, the second DC/DC converter is used for converting the output power supply of the storage battery pack into a power supply of the direct current bus, and the first DC/DC converter and the second DC/DC converter are controlled by the edge controller.
It can be understood that when the rated charge-discharge voltage of the storage battery pack is DC12V, the high-voltage direct current output by the alternating current distribution control unit needs to be converted into the rated charge-discharge voltage of the storage battery pack through the first DC/DC converter; further, when the storage battery pack is required to participate in power supply, assuming that the operating voltage of the direct current bus is DC110V, the discharge voltage of the storage battery pack needs to be converted into DC110V through the second DC/DC converter.
The edge controller is including the timer, patrol and examine the code table, patrol and examine the instruction storehouse, patrol and examine the code table with storage battery's serial number corresponds, the timer is used for setting up storage battery's nuclear capacity cycle, patrol and examine the instruction storehouse with the timer linkage, according to the battery state test and state collection are carried out to the nuclear capacity cycle of timer, the battery patrols and examines the appearance and receive the operation instruction information of patrolling and examining the instruction storehouse carries out the battery nuclear capacity.
It can be understood that 12V storage battery packs are independently configured for each component in the parallel direct-current system, and the components adopt an intermittent output voltage regulation mode, so that the online 0.1C10 full-capacity checking function of the storage battery is realized, and the automatic capacity checking management problem is solved. Through automatic capacity checking, the lagging storage battery is found in advance, the capacity checking result is stored in the edge controller, and the normal storage battery and the abnormal storage battery are calibrated. The distributed power management system can automatically carry out on-line full-capacity nuclear capacity on the storage battery according to a nuclear capacity period, only one battery is allowed to carry out nuclear capacity at each time, the system bus load is utilized to carry out the nuclear capacity, the battery automatically shifts to a uniform charging management stage after the nuclear capacity is finished, nuclear capacity data (storage battery voltage, current and the like) are recorded at half an hour interval in the nuclear capacity process, the nuclear capacity data are recorded every 10 minutes after the storage battery voltage is lower than 11V, the nuclear capacity data (including the voltage, the current, the nuclear capacity time and the physical capacity after the nuclear capacity) are stored in a storage unit of an edge controller, and through the N + X redundancy design of the system, even if one module on site exits from running due to the occurrence of a nuclear capacity problem, the running of the whole system is not influenced. The capacity lagging battery can be found in time through automatic capacity checking, when the capacity of the storage battery after capacity checking is less than 80% of the nominal capacity, monitoring is carried out, an alarm is sent out in time, operation and maintenance personnel are reminded to replace the storage battery, the maintenance workload of the system is reduced, and the operation reliability of the direct current system is improved.
The edge controller also comprises a comparison unit and a storage unit, wherein the storage unit stores the storage battery state test information and the state value acquired according to the polling period; the comparison unit sequentially calls the storage battery state test information and the state value to compare with the corresponding storage battery state test information and the corresponding state value, and if the deviation of the comparison value is greater than a set value, the state test information and the state value of the corresponding storage battery are sent to the monitoring platform; if the deviation of the comparison value is within the normal range, the state test information and the state value of the corresponding storage battery are deleted from the storage unit.
It can be understood that the state test information and the state values of the storage battery are compared and analyzed through the edge controller, and then the comparison result is sent to the monitoring platform, so that the field information can be displayed more efficiently and visually, and meanwhile, the state test information and the state values of the abnormal storage battery are deleted from the storage unit, so that the information redundancy can be reduced.
The method for sending the state test information and the state value of the corresponding storage battery to the monitoring platform comprises the following steps:
acquiring a routing inspection coding table, if the state value detected by the storage battery is abnormal, assigning 1 to the corresponding coding bit in the routing inspection coding table, and if the state value detected by the storage battery is normal, assigning 0 to the corresponding coding bit in the routing inspection coding table to generate a state truth table; and sending the state truth table to the monitoring platform.
The inspection instruction base comprises a plan inspection instruction base and an unplanned inspection instruction base, wherein the plan inspection instruction base stores trigger time and inspection duration corresponding to each storage battery inspection task; and the unplanned inspection instruction library is used for receiving the inspection instruction of the monitoring platform and performing inspection on the state of the corresponding storage battery according to the phased inspection code.
The direct current distribution control unit comprises a third DC/DC converter and a switching unit, wherein an input port of the switching unit is controlled by a power electronic switching device, and the power electronic switching device carries out logic control according to the coding address of the storage battery; the third DC/DC converter is used for converting the output power supply of the alternating current distribution control unit into the power supply of the direct current bus, and the third DC/DC converter is controlled by the edge controller.
As a supplementary implementation manner of this embodiment, the power electronic switching device performs logic control according to the coded address of the storage battery, and includes:
the third DC/DC converter does not receive an output power signal of the alternating current distribution control unit, the edge controller acquires a state truth table of the storage battery, and acquires a corresponding normal storage battery and a corresponding coding address thereof according to the state truth table;
and the edge controller performs power electronic switching action according to the coded address, so that a normal storage battery is used as a power supply of the direct-current bus.
As a supplementary implementation manner of this embodiment, the method further includes: the edge controller monitors the power output value of the normal storage battery in real time; and if the power output value of the normal storage battery is smaller than the rated operation value of the direct current bus, the edge controller acquires the normal storage battery adjacent to the current storage battery as the power supply of the direct current bus according to the state truth table.
The above-mentioned embodiments are preferred embodiments of the distributed power management system of the present invention, and not intended to limit the scope of the present invention, which includes but is not limited to the embodiments, and all equivalent changes in shape and structure made according to the present invention are within the scope of the present invention.
Claims (10)
1. A distributed power management system is arranged in a converter station and is characterized in that: the system comprises an alternating current distribution control unit, a conversion integration unit, a direct current distribution control unit, a storage battery polling instrument, an edge controller and a monitoring platform; the output end of the alternating current distribution control unit is respectively the input end of the direct current distribution control unit and the input end of the conversion integrated unit and is used for converting three-phase alternating current into direct current; the output end of the direct current distribution control unit is electrically connected with a direct current bus and used for direct current output regulation and control; the output end of the conversion integration unit is used as the person output end of the direct current distribution control unit and used for charging a storage battery pack; the storage battery patrol instrument, the alternating current distribution control unit, the conversion integrated unit and the direct current distribution control unit are controlled by the edge controller; the storage battery patrol instrument is used for checking the capacity of the storage battery pack; the edge controller is used for receiving the testing and monitoring instructions of the monitoring platform, and the monitoring platform is used for monitoring the states of all equipment of the converter station.
2. The system according to claim 1, wherein the transform integration unit comprises a plurality of transform integration sub-units connected in parallel, and the plurality of transform integration sub-units are active and standby.
3. The distributed power management system according to claim 2, wherein the conversion integrated subunit includes a first DC/DC converter, a second DC/DC converter and a storage battery pack, the first DC/DC converter is used for converting an output power of the ac distribution control unit into a charging power of the storage battery pack, the second DC/DC converter is used for converting an output power of the storage battery pack into a power supply of the DC bus, and both the first DC/DC converter and the second DC/DC converter are controlled by the edge controller.
4. The distributed power management system of claim 1,
the edge controller is including the timer, patrol and examine the code table, patrol and examine the instruction storehouse, patrol and examine the code table with storage battery's serial number corresponds, the timer is used for setting up storage battery's nuclear capacity cycle, patrol and examine the instruction storehouse with the timer linkage, according to the battery state test and state collection are carried out to the nuclear capacity cycle of timer, the battery is patrolled and examined the appearance and is received the operation instruction information who patrols and examines the instruction storehouse carries out the battery nuclear capacity.
5. The distributed power management system according to claim 4, wherein the edge controller further comprises a comparison unit and a storage unit, wherein the storage unit stores the storage battery state test information and the state values acquired according to the polling cycle; the comparison unit sequentially calls the storage battery state test information and the state value to compare with the corresponding storage battery state test information and the corresponding state value, and if the deviation of the comparison value is larger than a set value, the state test information and the state value of the corresponding storage battery are sent to the monitoring platform; if the deviation of the comparison value is within the normal range, the state test information and the state value of the corresponding storage battery are deleted from the storage unit.
6. The distributed power management system of claim 5,
the method for sending the state test information and the state value of the corresponding storage battery to the monitoring platform comprises the following steps:
acquiring a routing inspection coding table, if the state value detected by the storage battery is abnormal, assigning 1 to the corresponding coding bit in the routing inspection coding table, and if the state value detected by the storage battery is normal, assigning 0 to the corresponding coding bit in the routing inspection coding table to generate a state truth table; and sending the state truth table to the monitoring platform.
7. The distributed power management system of claim 4,
the inspection instruction base comprises a plan inspection instruction base and an unplanned inspection instruction base, and the plan inspection instruction base stores trigger time and inspection duration corresponding to each storage battery inspection task; and the unplanned inspection instruction library is used for receiving the inspection instruction of the monitoring platform and performing inspection on the state of the corresponding storage battery according to the phased inspection code.
8. The distributed power management system of claim 1,
the direct current distribution control unit comprises a third DC/DC converter and a switching unit, an input port of the switching unit is controlled by a power electronic switching device, and the power electronic switching device carries out logic control according to the coding address of the storage battery; the third DC/DC converter is used for converting the output power supply of the alternating current distribution control unit into the power supply of the direct current bus, and the third DC/DC converter is controlled by the edge controller.
9. The distributed power management system of claim 6,
the power electronic switch device carries out logic control according to the coded address of the storage battery, and comprises:
the third DC/DC converter does not receive the output power supply signal of the alternating current distribution control unit, the edge controller acquires a state truth table of the storage battery, and acquires a corresponding normal storage battery and a corresponding coding address thereof according to the state truth table;
and the edge controller performs power electronic switching action according to the coded address, so that a normal storage battery is used as a power supply of the direct-current bus.
10. The distributed power management system of claim 9,
further comprising: the edge controller monitors the power output value of the normal storage battery in real time; and if the power output value of the normal storage battery is smaller than the rated operation value of the direct current bus, the edge controller acquires the normal storage battery adjacent to the current storage battery as the power supply of the direct current bus according to the state truth table.
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