CN111555279A - Method for maintaining power utilization continuity based on intelligent unloading of three-level load - Google Patents

Method for maintaining power utilization continuity based on intelligent unloading of three-level load Download PDF

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Publication number
CN111555279A
CN111555279A CN202010458026.6A CN202010458026A CN111555279A CN 111555279 A CN111555279 A CN 111555279A CN 202010458026 A CN202010458026 A CN 202010458026A CN 111555279 A CN111555279 A CN 111555279A
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transformer
load
power
level
unloading
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Chinese (zh)
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孙巍巍
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Tianjin Zhongli Shendun Electronics Technology Co Ltd
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Tianjin Zhongli Shendun Electronics 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
    • H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H02J3/144—Demand-response operation of the power transmission or distribution network
    • 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
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
    • 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
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides a method for maintaining power utilization continuity based on intelligent unloading of three-level loads, which is used for acquiring the electrification condition of a line in a transformer bank, detecting the loss of power of one line, judging according to the state parameters of the transformer, and carrying out intelligent switching and unloading of the three-level loads. The invention has the beneficial effects that: when one power supply or one transformer fails and is powered by the transformer on the other power supply, the residual load capacity of the transformer except for the primary load and the secondary load is fully utilized to simultaneously supply power for the tertiary load, so that the continuity of a power supply system is effectively improved; the fine control is improved, the utilization efficiency of the transformer is fully improved on the premise of ensuring the power supply reliability of the primary load and the secondary load according to the monitoring and control of the load utilization rate of the transformer, the normal operation and the power supply continuity of the tertiary load are ensured to the maximum extent, and the power supply reliability of the tertiary load is improved.

Description

Method for maintaining power utilization continuity based on intelligent unloading of three-level load
Technical Field
The invention relates to the technical field of power electrical equipment, in particular to a method for maintaining power utilization continuity based on intelligent unloading of three-level loads.
Background
According to the requirement of power utilization equipment on power supply reliability, the power supply load is divided into three stages; in order to meet the requirements of primary and secondary loads on power supply reliability, a power supply and distribution system usually adopts two paths of medium-voltage power supplies for power supply, two or more transformers are arranged in a power transformation facility, and the transformers are arranged in pairs, run in rows and are mutually standby. The automatic switching system of the bus-coupled standby power supply is connected between two paths of incoming lines of the substation and is switched in an automatic or manual mode. When any power supply fails or one transformer fails, the power supply conversion is realized through the automatic switching of the low-voltage bus coupler, and the other transformer recovers to supply power to the load on the power-off bus. In order to prevent overload which may occur when a single transformer supplies power for two sections of buses at the same time, the three-level load needs to be automatically unloaded while the low-voltage bus coupler is automatically switched on, so that power supply for the first-level load and the second-level load is guaranteed. With the continuous progress of society and the continuous improvement of living standard of people, the requirements of users on the continuity and reliability of power supply are higher and higher.
Existing three-stage load shedding schemes often rely on a no-voltage release. The specific implementation mode is as follows: the method comprises the following steps that (1) a voltage-loss tripper is additionally arranged on all three-level load loops, a coil of the tripper is connected to a main loop, when two paths of power supplies (transformers) all normally operate, each three-level load can be in a powered state, the coil of the voltage-loss tripper is electrified, an attraction state is kept, and the main loop is always in a communicated state; when one power supply (transformer) loses power, all loops carried by the power supply (transformer) are powered off for one time, at the moment, a loss-of-voltage tripper coil on a three-level load loop is powered off along with the loss of power, loss-of-voltage tripping action is generated, the three-level load loop is completely disconnected, then, the switching of a bus coupler or similar actions is executed, and only one-level load and one-level load on the side with power failure can be connected to a normal power supply (transformer) to continue to operate; however, the voltage-loss tripper does not have the switching-on capacity, and the unloaded three-stage load loop is always kept in the off state.
This solution has the following problems: 1) during normal operation, because the condition of power loss does not occur, the voltage-loss tripper coil can be always in an electrified attraction state, is easy to generate heat and age, influences the service life and reliability, and wastes electric energy. 2) When a power supply or a transformer on one side fails, the voltage-loss tripper can only unload the three-level load on the power-loss side bus, but cannot throw off all the three-level loads. After the low-voltage bus coupler is automatically put into use, the transformer still has overload risks with all primary and secondary loads and the tertiary load on a normal power supply bus; 3) the action of the voltage-loss release has no selectivity, but a loop provided with the voltage-loss release is cut by a knife, so that the load capacity of a normal power supply (transformer) cannot be fully utilized; 4) the load utilization rate of the transformer in the operation cannot be effectively monitored in real time, and after all three-level load loops are unloaded, a user manually adds one or more three-level load loops to restore the power supply access system, so that the power supply reliability of the three-level load is reduced. 5) When a large-capacity electric device is started or a low-voltage side of a system has a short-circuit fault, the voltage of a bus drops in a short time, and a voltage-loss release possibly malfunctions, so that unexpected load unloading is caused, and the power supply continuity of three-level loads is influenced.
Disclosure of Invention
In order to solve the problems, the invention provides a method for maintaining power utilization continuity based on intelligent unloading of three-level loads.
In order to achieve the purpose, the method for maintaining the electricity continuity based on the intelligent unloading of the three-level load is characterized by comprising the following steps: and acquiring the electrification condition of the inlet wires of the same transformer group, and judging according to the state parameters of the transformer to carry out switching and three-stage load unloading actions if detecting that one inlet wire loses power.
Further, the transformer state parameter includes a transformer load utilization.
Further, the operation of switching and unloading the three-level load according to the judgment of the state parameters of the transformer specifically includes: switching to the other path of non-power-loss incoming line under the same transformer bank, monitoring the state parameters of the transformer in real time, diagnosing and polling the state parameters of the transformer on the non-power-loss incoming line, and if the transformer is not overloaded after running for a period of time, unloading a three-level load is not needed; and if the transformer is overloaded and the utilization rate of the transformer load is overhigh, alarming, inquiring the priorities of all three-level load loops mounted under the transformer bank, and selecting and unloading according to the priorities of the three-level load loops until the utilization rate of the transformer load is reduced to a normal level.
Further, the operation of switching and unloading the three-level load according to the judgment of the state parameters of the transformer specifically includes: monitoring the state parameters of the transformer in real time, diagnosing and polling the state parameters of the transformer on the power-loss-free incoming line, and determining the load allowance of the transformer except for a primary load loop and a secondary load loop; determining a three-level load loop capable of being loaded by the transformer according to the load allowance of the transformer, the priority of the three-level load loop and the capacity information; and unloading the three-stage load loop outside the transformer load capacity range on the non-power-loss inlet wire, and switching to the other non-power-loss inlet wire under the same transformer bank.
Furthermore, when the electrification condition of the inlet wire is obtained, the power loss of one inlet wire is detected, the primary, secondary and tertiary loads are preset before the operation of switching and unloading the tertiary loads is judged according to the state parameters of the transformer, and the priority of the tertiary load loop is divided.
Further, the transformer bank refers to a transformer bank relation established by transformers on incoming lines in the same power supply range;
when one transformer in the transformer bank is disconnected, the capacities of the other transformers meet the power consumption of the primary load circuit and the secondary load circuit.
Further, the switching to the other non-power-loss incoming line under the same transformer bank means that switching is performed through the bus tie backup automatic switching system, switching is performed to the other non-power-loss incoming line under the same transformer bank, and all loads under the transformer of the power-loss incoming line are mounted under the transformer of the other non-power-loss incoming line under the same transformer bank.
Further, the diagnosis and polling of the transformer state parameters on the power-on and power-off incoming line comprise transformer state diagnosis and transformer state polling.
Further, the transformer state diagnosis is to determine the transformer state according to the obtained transformer load utilization rate and the load utilization rate threshold.
Further, the method for calculating the load utilization rate of the transformer comprises the following steps: acquiring the working load of a transformer in a set time period, and determining the maximum load of the transformer according to the working load;
and determining the load utilization rate of the transformer according to the maximum load and the rated load of the transformer.
Further, if the load utilization rate of the transformer is too high, the alarm is that the load utilization rate of a certain transformer exceeds a load utilization rate alarm threshold value, the transformer is monitored and timed, and if the overload operation lasts for a period of time, the alarm is given out to prompt the overload of the transformer.
Further, the loop priority is an attribute that characterizes the importance of the loop.
The method for maintaining power utilization continuity based on intelligent unloading of the three-level load has the beneficial effects that: fine control is improved, and the utilization efficiency of the transformer is fully improved on the premise of ensuring the power supply reliability of the primary load and the secondary load according to the monitoring and control of the utilization rate of the transformer load; the fine control is improved, the utilization efficiency of the transformer is fully improved on the premise of ensuring the power supply reliability of the primary load and the secondary load according to the monitoring and control of the load utilization rate of the transformer, the normal operation and the power supply continuity of the tertiary load are ensured to the maximum extent, and the power supply reliability of the tertiary load is improved.
Drawings
FIG. 1 is a flowchart of a method for maintaining electrical continuity based on intelligent offloading of tertiary loads according to example 5 of the present invention;
fig. 2 is a system flow chart of a method for maintaining electrical continuity based on intelligent load shedding of three levels of load according to embodiment 6 of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The method for maintaining the power continuity based on the intelligent unloading three-level load is described in detail below with reference to the attached drawings.
The method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps: and acquiring the electrification condition of the inlet wires of the same transformer group, and judging according to the state parameters of the transformer to carry out switching and three-stage load unloading actions if detecting that one inlet wire loses power.
The transformer state parameters include transformer load utilization.
The operation of switching and unloading three-level loads according to the judgment of the state parameters of the transformer specifically comprises the following steps: switching to the other non-power-loss inlet wire under the same transformer bank, diagnosing and polling the transformer state parameters on the inlet wire on the power-loss inlet wire, and if the transformer is not overloaded after running for a period of time, not needing to unload the third-level load; and if the transformer is overloaded and the utilization rate of the transformer load is overhigh, alarming, inquiring all three-level load loops mounted under the transformer bank, and selecting and unloading according to the priority of the three-level load loops until the utilization rate of the transformer load is reduced to a normal level.
The operation of switching and unloading three-level loads according to the judgment of the state parameters of the transformer specifically comprises the following steps: monitoring the state parameters of the transformer in real time, diagnosing and polling the state parameters of the transformer on the power-loss-free incoming line, and determining the load allowance of the transformer except for the primary loop load and the secondary loop load; determining a transformer energy load three-level load loop according to the load allowance of the transformer, the priority of the three-level load loop and the capacity information; and unloading the three-stage load loop outside the transformer load capacity range on the non-power-loss inlet wire, and switching to the other non-power-loss inlet wire under the same transformer bank.
When the electrification condition of an incoming line is taken, the power loss of one incoming line is detected, the first-level load, the second-level load and the third-level load are preset before the operation of switching and unloading the third-level load is judged according to the state parameters of the transformer, and the priority of a third-level load loop is divided.
The transformer bank refers to the relationship of establishing the associated transformer bank for the transformers on the inlet wires in the same power supply range;
when one transformer in the transformer bank is disconnected, the capacities of the other transformers meet the power consumption of the primary load and the secondary load.
The switching to the other non-power-loss inlet wire under the same transformer bank means that the switching is carried out through the bus-tie spare power automatic switching system, the switching is carried out to the other non-power-loss inlet wire under the same transformer bank, and all loads under the transformer of the power-loss inlet wire are mounted to the transformer of the other non-power-loss inlet wire under the same transformer bank.
The diagnosis and polling of the transformer state parameters on the power-on and power-off incoming line comprise transformer state diagnosis and transformer state polling.
The transformer state diagnosis is to determine the transformer state according to the obtained transformer load utilization rate and the load utilization rate threshold. The transformer states include: the transformer load utilization rate is low, the transformer load utilization rate is normal, the transformer load utilization rate is high, and the transformer is overloaded.
Preferably, the load utilization threshold comprises: a first load utilization threshold, a second load utilization threshold, and a third load utilization threshold, wherein the second load utilization threshold is greater than the first load utilization threshold, and the third load utilization threshold is greater than the second load utilization threshold; determining the state of the transformer according to the load utilization rate and the load utilization rate threshold, wherein the step comprises the following steps: when the load utilization rate of the transformer is determined to be smaller than the first load utilization rate threshold value, determining that the transformer state is that the load utilization rate of the transformer is low; and/or when the load utilization rate of the transformer is judged to be more than or equal to the first load utilization rate threshold value and less than or equal to the second load utilization rate threshold value, determining that the transformer state is that the load utilization rate of the transformer is normal; and/or when the load utilization rate of the transformer is judged to be greater than the second load utilization rate threshold value and less than or equal to the third load utilization rate threshold value, determining that the transformer state is that the load utilization rate of the transformer is higher; and/or when the load utilization rate of the transformer is judged to be larger than the third load utilization rate threshold value, determining that the state of the transformer is the overload of the transformer.
The method for calculating the load utilization rate of the transformer comprises the following steps: acquiring the working load of the transformer in a set time period, and determining the maximum load of the transformer according to the working load;
and determining the load utilization rate of the transformer according to the maximum load and the rated load of the transformer.
And if the load utilization rate of the transformer is too high, alarming is that the load utilization rate of a certain transformer exceeds a load utilization rate alarming threshold value, monitoring and timing the transformer, and if the overload operation lasts for a period of time, alarming is given out to prompt the overload of the transformer.
The loop priority is an attribute that characterizes the importance of the loop.
The attribute of the importance degree of the loop adopts numbers, the smaller the number is, the higher the priority is, the smaller the number is, the more important the number is, for example, a loop mark 1, the priority is the 1 st priority, the most important is in all three-level load loops, and the loop is finally considered to be unloaded when the three-level load needs to be unloaded; the attribute of the importance degree of the loop can also adopt English letters, the priority of the English letters is reduced from A to Z, the more the English letters are ranked, the more important the English letters are, for example, the loop mark A, the priority of the loop mark A is the priority of A, the most important of all three-level load loops is, and the unloading of the loop is finally considered when the three-level load needs to be unloaded.
The load utilization rate threshold value and the load utilization rate alarm threshold value are obtained by a self-learning process through initial setting of the load utilization rate threshold value and the load utilization rate alarm threshold value.
Aiming at the places powered by multiple power sources, when one power source loses power and the bus tie backup power automatic switching action is executed, the power monitoring and protecting system can intelligently unload the three-level load in order to ensure that the transformer does not work in an overload mode.
The intelligent unloading of the three-level load not only ensures the operation safety of the transformer, but also enables more three-level load devices to work normally as far as possible. When the three-level load needs to be cut off in an emergency, the three-level load set by the system can be judged and selectively cut off according to the actual load rate of the transformer, and meanwhile, the load type is flexibly reset according to the actual requirement, so that the extensive one-step control of the traditional three-level load is changed, the flexible and fine adjustment and control are realized, and the power supply reliability of the three-level load is improved.
The software of the remote intelligent monitoring master station configures and starts an intelligent unloading three-level load program, the first, second and third-level loads are preset, the importance degree of the three-level loads is further subdivided, when an emergency occurs, reasonable calculation and planning are carried out according to the load allowance of the transformer, the three-level loads are automatically unloaded according to a preset program, and the power supply continuity of the three-level loads is realized to the maximum extent under the condition that the power supply continuity and reliability of the first and second-level loads are guaranteed as far as possible.
Example 1
The method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps: and acquiring the electrification condition of the inlet wires of the same transformer group, and judging according to the state parameters of the transformer to carry out switching and three-stage load unloading actions if detecting that one inlet wire loses power.
Example 2
The method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps: and acquiring the electrification condition of the inlet wires of the same transformer group, and judging according to the state parameters of the transformer to carry out switching and three-stage load unloading actions if detecting that one inlet wire loses power.
The transformer state parameters include transformer load utilization.
Example 3
The method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps: the method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps:
and acquiring the electrification condition of the inlet wires of the same transformer bank, and if detecting that the two inlet wires are normal and have no power loss, continuing normal operation without performing switching and three-stage load unloading actions.
Example 4
The method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps: the method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps:
step 101: acquiring the electrification condition of the incoming line, detecting the loss of power of one incoming line,
step 102: all load loops on the power-loss incoming line are switched to the other power-loss incoming line of the same transformer bank;
step 103: monitoring the state parameters of the transformer on the incoming line without power loss in real time, and diagnosing and polling the state parameters of the transformer on the incoming line without power loss; wherein the transformer state parameter comprises a transformer load utilization rate.
Step 104: if no overload occurs after the transformer on the non-power-loss incoming line operates for a period of time, the transformer does not need to unload the three-level load and continues to operate normally;
example 5
The method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps: the method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps:
step 201: acquiring the electrification condition of an incoming line, and detecting the loss of power of one incoming line;
step 202: all load loops on the power-loss incoming line are switched to the other power-loss incoming line of the same transformer bank;
step 203: monitoring the state parameters of the transformer on the incoming line without power loss in real time, and diagnosing and polling the state parameters of the transformer on the incoming line without power loss; the transformer state parameters comprise transformer load utilization rate;
step 204: and if the transformer on the power-loss incoming line is overloaded and the utilization rate of the transformer load is overhigh, alarming, inquiring all three-level load loops mounted under the transformer bank, and selecting and unloading according to the priority of the three-level load loops until the transformer is reduced to a normal level.
Example 6
The method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps: the method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps:
step 301: acquiring the electrification condition of an incoming line, and detecting the loss of power of one incoming line;
step 302: monitoring the state parameters of the transformer on the incoming line without power loss in real time, and diagnosing and polling the state parameters of the transformer on the incoming line without power loss;
step 303: determining the load allowance of the transformer on the inlet wire without power loss except for a primary load loop and a secondary load loop;
step 304: determining a three-level load loop which can be loaded by the transformer according to the load allowance of the transformer on the incoming line without power loss, the priority of the three-level load loop and the capacity information;
step 305: and unloading the three-stage load loop outside the transformer load capacity range on the non-power-loss inlet wire, and switching to the other non-power-loss inlet wire under the same transformer bank.
Example 7
The method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps: the method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps:
step 401: presetting first, second and third level loads, and dividing the priority of the third level load loop.
Step 402: acquiring the electrification condition of an incoming line, and detecting the loss of power of one incoming line;
step 403: all load loops on the power-loss incoming line are switched to the other power-loss incoming line of the same transformer bank;
step 404: monitoring the state parameters of the transformer on the incoming line without power loss in real time, and diagnosing and polling the state parameters of the transformer on the incoming line without power loss; wherein the transformer state parameter comprises a transformer load utilization rate.
Step 405: and if the transformer on the power-loss incoming line is overloaded and the utilization rate of the transformer load is overhigh, alarming, inquiring all three-level load loops mounted under the transformer bank, and selecting and unloading according to the priority of the three-level load loops until the transformer is reduced to a normal level.
The transformer bank refers to the relationship of establishing the associated transformer bank for the transformers on the inlet wires in the same power supply range;
when one transformer in the transformer bank is disconnected, the capacities of the other transformers meet the power consumption of the primary load and the secondary load.
The utilization rate of the transformer in the transformer bank is required after switching and unloading, great redundancy can be reserved during the design of the transformer, and the transformer can be overloaded for a short time.
Example 8
The method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps: the method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps:
step 501: setting a transformer bank;
the transformer bank refers to the relationship of establishing the associated transformer bank for the transformers on the inlet wires in the same power supply range;
when one transformer in the transformer bank is disconnected, the capacities of the other transformers meet the power consumption of the primary load and the secondary load.
Step 502: presetting first, second and third level loads, and dividing the priority of the third level load loop.
Step 503: acquiring the electrification condition of an incoming line, and detecting the loss of power of one incoming line;
step 504: all load loops on the power-loss incoming line are switched to the other power-loss incoming line of the same transformer bank;
step 505: monitoring the state parameters of the transformer on the incoming line without power loss in real time, and diagnosing and polling the state parameters of the transformer on the incoming line without power loss; wherein the transformer state parameter comprises a transformer load utilization rate.
Step 506: and if the transformer on the power-loss incoming line is overloaded and the utilization rate of the transformer load is overhigh, alarming, inquiring all three-level load loops mounted under the transformer bank, and selecting and unloading according to the priority of the three-level load loops until the transformer is reduced to a normal level.
Example 9
The method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps: the method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps:
step 601: setting a transformer bank;
the transformer bank refers to the relationship of establishing the associated transformer bank for the transformers on the inlet wires in the same power supply range;
when one transformer in the transformer bank is disconnected, the capacities of the other transformers meet the power consumption of the primary load and the secondary load
Step 602: presetting first, second and third level loads, and dividing the priority of the third level load loop.
Step 603: acquiring the electrification condition of an incoming line, and detecting the loss of power of one incoming line;
step 604: monitoring the state parameters of the transformer on the incoming line without power loss in real time, and diagnosing and polling the state parameters of the transformer on the incoming line without power loss;
step 605: determining the load allowance of the transformer on the inlet wire without power loss except for a primary load loop and a secondary load loop;
step 606: determining a three-level load loop which can be loaded by the transformer according to the load allowance of the transformer on the incoming line without power loss, the priority of the three-level load loop and the capacity information;
step 607: and unloading the three-stage load loop outside the transformer load capacity range on the non-power-loss inlet wire, and switching to the other non-power-loss inlet wire under the same transformer bank.
Example 10
The method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps: the method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps:
step 701: setting a transformer bank;
the transformer bank refers to the relationship of establishing the associated transformer bank for the transformers on the inlet wires in the same power supply range;
when one transformer in the transformer bank is disconnected, the capacities of the other transformers meet the power consumption of the primary load and the secondary load.
Step 702: presetting first, second and third level loads, and dividing the priority of the third level load loop.
Step 703: acquiring the electrification condition of an incoming line, and detecting the loss of power of one incoming line;
step 704: switching is carried out through a bus-tie spare power automatic switching system, the switching is carried out on the other non-power-loss inlet wire under the same transformer bank, and all loads under the transformer of the power-loss inlet wire are mounted under the transformer of the other non-power-loss inlet wire under the same transformer bank;
all load loops on the power-loss incoming line are switched to the other power-loss incoming line of the same transformer bank;
step 705: monitoring the state parameters of the transformer on the incoming line without power loss in real time, and diagnosing and polling the state parameters of the transformer on the incoming line without power loss; wherein the transformer state parameter comprises a transformer load utilization rate.
Step 706: and if the transformer on the power-loss incoming line is overloaded and the utilization rate of the transformer load is overhigh, alarming, inquiring all three-level load loops mounted under the transformer bank, and selecting and unloading according to the priority of the three-level load loops until the transformer is reduced to a normal level.
Example 11
Besides any scheme of the embodiment 4-10, the method also comprises the following technical scheme:
the diagnosis and polling of the state parameters of the transformer on the power-on and power-off incoming line comprise transformer state diagnosis and transformer state polling;
the transformer state diagnosis method comprises the following steps: and determining the state of the transformer according to the obtained transformer load utilization rate and the load utilization rate threshold.
Example 12
The method also comprises the following technical scheme in addition to any scheme of the embodiment 2-10:
the method for calculating the load utilization rate of the transformer comprises the following steps:
step 801: acquiring the working load of a transformer in a set time period, and determining the maximum load of the transformer according to the working load;
in a power distribution system, an electrical signal of a transformer in an operation process is acquired through a sensor (such as a shunt, an electromagnetic current transformer, an electronic current transformer), a digital control terminal samples, converts and the like the acquired electrical signal, and determines a workload of the transformer in a set time period, wherein the workload can be, but is not limited to, the current or the power of the transformer in an operation state.
And determining the maximum load of the transformer, such as the maximum current or the maximum power of the transformer in the running state, according to the acquired working load of the transformer in the set time period.
Step 802: and determining the load utilization rate of the transformer according to the maximum load and the rated load of the transformer.
Based on the calculation formula of the load utilization rate of the transformer, the load utilization rate of the transformer is determined according to the maximum load and the rated load of the transformer, and in this embodiment, the load utilization rate of the transformer may adopt the following formula:
n＝T1/T2
wherein, T1Indicating the maximum load, T, of the transformer2Representing the rated load of the transformer and n representing the load utilization of the transformer.
106, determining the state of the transformer according to the load utilization rate and the load utilization rate threshold value
And comparing the load utilization rate of the transformer with a load utilization rate threshold, and determining the state of the transformer according to the comparison result.
The method specifically comprises the following steps: and when the load utilization rate of the transformer is not less than the load utilization rate threshold value, determining that the state of the transformer is abnormal.
In this embodiment, the load utilization threshold may be set according to the distribution system and the transformer, for example, 85%, and this embodiment is not particularly limited.
Example 13
Besides the embodiments 11 and 12, the method also comprises the following technical scheme:
a method of transformer condition diagnosis, comprising:
step 901: acquiring a load utilization rate and a load utilization rate threshold of a transformer;
wherein: the method for calculating the load utilization rate of the transformer comprises the following steps:
acquiring the working load of a transformer in a set time period, and determining the maximum load of the transformer according to the working load;
determining the load utilization rate of the transformer according to the maximum load and the rated load of the transformer;
wherein the load utilization threshold comprises: a first load utilization threshold, a second load utilization threshold, and a third load utilization threshold, the second load utilization threshold being greater than the first load utilization threshold, the third load utilization threshold being greater than the second load utilization threshold;
step 902: determining the state of the transformer;
wherein the transformer state comprises: the transformer load utilization rate is low, the transformer load utilization rate is normal, the transformer load utilization rate is high, and the transformer is overloaded.
A method of determining a state of a transformer, comprising:
when the load utilization rate of the transformer is determined to be smaller than the first load utilization rate threshold value, determining that the transformer state is that the load utilization rate of the transformer is low;
and/or when the load utilization rate of the transformer is judged to be more than or equal to the first load utilization rate threshold value and less than or equal to the second load utilization rate threshold value, determining that the transformer state is that the load utilization rate of the transformer is normal;
and/or when the load utilization rate of the transformer is judged to be greater than the second load utilization rate threshold value and less than or equal to the third load utilization rate threshold value, determining that the transformer state is that the load utilization rate of the transformer is higher;
and/or when the load utilization rate of the transformer is judged to be larger than the third load utilization rate threshold value, determining that the state of the transformer is the overload of the transformer.
In this embodiment, the load utilization threshold may be, but is not limited to: a first load utilization threshold, a second load utilization threshold, and a third load utilization threshold, wherein the second load utilization threshold is greater than the first load utilization threshold, and the third load utilization threshold is greater than the second load utilization threshold; for example, the first load utilization threshold is 40%, the second load utilization threshold is 85%, and the third load utilization threshold is 110%.
Example 13
Besides any scheme of the embodiment 5-11, the method also comprises the following technical scheme:
and if the load utilization rate of the transformer is too high, alarming is that the load utilization rate of a certain transformer exceeds a load utilization rate alarming threshold value, monitoring and timing the transformer, and if the overload operation lasts for a period of time, alarming is given out to prompt the overload of the transformer.
Example 14
Besides the embodiments 10 and 11, the method also comprises the following technical scheme:
the loop priority is an attribute that characterizes the importance of the loop.
The attribute of the importance degree of the loop adopts numbers, the smaller the number is, the higher the priority is, the smaller the number is, the more important the number is, for example, a loop mark 1, the priority is the 1 st priority, the most important is in all three-level load loops, and the loop is finally considered to be unloaded when the three-level load needs to be unloaded; the attribute of the importance degree of the loop can also adopt English letters, the priority of the English letters is reduced from A to Z, the more the English letters are ranked, the more important the English letters are, for example, the loop mark A, the priority of the loop mark A is the priority of A, the most important of all three-level load loops is, and the unloading of the loop is finally considered when the three-level load needs to be unloaded.
Example 15
The method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps:
step 1: system configuration
And establishing a transformer bank management module, establishing a transformer bank relation between the two associated transformers, and realizing the functions of increasing, deleting, changing, checking and the like of the transformer bank by the module. And meanwhile, a loop mounted under the transformer carries out marking management of grade (first, second and third grade) and priority.
Step 2: transformer bus-tie automatic switching
When one of the two transformers in the bus coupler is in fault and power failure, the automatic switching is carried out, and all the mounting loops under the fault transformer are automatically mounted on the other transformer in the transformer bank, namely all the loops in the original transformer bank are mounted on the same transformer.
And step 3: transformer load rate monitoring
And starting a transformer load rate monitoring process, polling the states of all transformers in the system, monitoring and timing the transformer when the negative utilization rate of one transformer exceeds an alarm value, and popping an alarm event to prompt that the load of the transformer is too high when the overload operation lasts for a period of time (which can be set).
And 4, step 4: automatic unloading three-level load
When the transformer overload operation alarm event is monitored in the step 3, whether the scene described in the step 2 occurs in the transformer bank is judged firstly (namely whether one transformer in the transformer exits is judged through a bus tie switch signal), if the scene in the step 2 is met, all three-level load loops in the transformer bank are inquired, one three-level loop is selected in reverse order according to the priority, and the system automatically exits the loop and records a log. If the load is still too high when the transformer is next polled, the method continues to unload a three-stage loop until the transformer load rate is reduced to a normal level.
5. Three-stage load recovery
When the transformer load with the transformer overload operation alarm is detected to be recovered to be normal, the transformer alarm event is relieved, and a user can manually add one or more three-level load loops to recover power supply or automatically recover power supply according to the priority of the loops; in addition, when two transformers in the transformer bank are recovered to run simultaneously, the hardware equipment can recover the normal running of the lower loops of all the transformers
6. Three-level load automatic exit record
And the loop is inquired according to the condition, and the record is automatically quitted, so that the later inquiry is facilitated.
Example 16
The method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps:
1. recording the importance degree and the capacity information of each load loop;
the judger of the unloading action is no longer a coil of the voltage-loss release, each load loop is provided with a medium-force intelligent terminal, and each terminal records the importance degree and the capacity information of the loop where the terminal is located;
2. monitoring the current utilization rate of the transformer in real time to obtain the total load of the transformer which is not lost;
determining the load allowance of the transformer on the inlet wire without power loss except for a primary load loop and a secondary load loop;
3. determining a three-level load loop which can be loaded by the transformer according to the load allowance of the transformer on the incoming line without power loss, the priority of the three-level load loop and the capacity information;
specifically, the method comprises the following steps: after power failure, the number of the three-level load circuits and the number of the three-level load circuits which should be carried in addition to the first-level load circuit and the second-level load circuit are accurately judged.
4. And unloading the three-stage load loop outside the transformer load capacity range on the non-power-loss inlet wire, and switching to the other non-power-loss inlet wire under the same transformer bank.
Specifically, the method comprises the following steps: after the judgment is completed, the system specifically unloads the three-stage loop outside the load capacity range directly before the backup power automatic switching; the problem of one-time cutting is avoided.
In the embodiment, the priority of the three-level load in the class is required to be deeply subdivided, important three-level loads are kept as much as possible in the unloading process, and the safe operation of the transformer is ensured while the negative influence of power loss is reduced to the maximum extent.
Example 17
Besides any scheme of the embodiment 1 to 16, the method also comprises the following technical scheme:
the shunt release is adopted for automatic unloading, the shunt release is an electromagnetically operated release, and when the power supply voltage is kept at a certain ratio of the rated control power supply voltage, for example, 70% -15%, the shunt release performs a tripping action, so that the unloading of a three-level load loop is realized in the embodiment. The circuit breaker is usually used for a loop which needs an external electric signal to control the circuit breaker to open and break a power supply. The shunt release is normally not energized, only when an external voltage signal is applied or the appliance needs to be locked in the off position, specifically: and a shunt release is arranged in a tertiary load outlet loop of a main power distribution cabinet of the substation, and a normally open contact of a closing auxiliary contact of the bus tie breaker is connected into a control power supply loop of a shunt coil. When the bus coupler is automatically switched in, the switching-on auxiliary contact is closed. And a power supply loop of the shunt coil is switched on, and the breaker trips when the coil is electrified, so that the three-level load is automatically disconnected.
Compared with the scheme of using a voltage-loss release, the invention avoids the misoperation caused by voltage drop and solves the problem that the service life of the coil is influenced by long-term electrification; meanwhile, the three-level load loop can be cut off by utilizing a bus coupler closing signal according to the priority information of the three-level load loop, and the condition that all three-level load loops need to be unloaded is determined according to calculation (a voltage-loss release can only unload the three-level load on a power-loss side bus, but can not throw off all three-level loads); the condition that a three-level load loop of a voltage-loss release is cut by a knife and the load capacity of a normal power supply (transformer) can be fully utilized is also avoided; monitoring the state parameters of the transformer on the incoming line without power loss in real time, and diagnosing and polling the state parameters of the transformer on the incoming line without power loss; selecting and unloading according to the priority of the three-level load circuit until the transformer is reduced to a normal level, and improving the power supply reliability of the three-level load; and by adopting the time-delay action, the accidental load unloading caused by short-time voltage drop of the bus voltage is avoided, and the power supply continuity of the three-level load is ensured.
Example 18
The method for maintaining the power utilization continuity based on the intelligent unloading of the three-level load comprises the following steps: and acquiring the electrification condition of the inlet wires of the same transformer group, and judging according to the state parameters of the transformer to carry out switching and three-stage load unloading actions if detecting that one inlet wire loses power. The transformer state parameter is the load current.
And judging whether the transformer state is overloaded or not. The judgment can be carried out through the load current actually measured by the low-voltage main circuit breaker. Long-delay protection set value I of general main-inlet circuit breakerrClose to or equal to the rated current of the low-voltage side of the transformer when the actual load current exceeds IrWhen the transformer is overloaded, the transformer can be considered to be overloaded, and a signal can be sent to carry out intelligent automatic unloading.
The circuit breakers on the two incoming lines and the bus-bar circuit breakers of the buses are provided with bus-bar spare power automatic switching systems, and the shunt release is installed on the three-level load loops on the two sections of low-voltage buses and used for unloading control. The current unload threshold may be set to Ir85% of the delay time, the delay time is set to be a long delay time tr50% of the total recovery time, the recovery threshold is set to IrAnd 75% of the total time, the delay time is set to 10 s. Of two-way incoming circuit breakers, IrSetting value of 2000A, trThe setting value is 12 s. When the fault of one incoming line transformer fails to work, the circuit breaker on the line is opened, the circuit breaker on the bus is closed, and when the transformer on the non-power-loss line carries all loads, if the load current of the non-power-loss line exceeds 1700A and is delayed for 6s, the circuit breaker contact on the non-power-loss line is closed, and the circuit breaker contact on the bus is already closed. The upper shunt release of each three-level load loop acts, the tripping action of the breaker is carried out according to the priority of the three-level load loop, and the three-level load is automatically unloaded.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and all such changes or substitutions are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (12)

1. The method for maintaining power utilization continuity based on intelligent unloading of three-level loads is characterized by comprising the following steps of: and acquiring the electrification condition of the inlet wires of the same transformer group, and judging according to the state parameters of the transformer to carry out switching and three-stage load unloading actions if detecting that one inlet wire loses power.
2. The intelligent offloading three level load based method of maintaining electrical continuity according to claim 1, wherein the transformer state parameter comprises transformer load utilization.
3. The method for maintaining power utilization continuity based on intelligent unloading of the three-level load according to claim 2, wherein the operation of switching and unloading the three-level load according to the judgment of the state parameter of the transformer specifically comprises: switching to the other path of non-power-loss incoming line under the same transformer bank, monitoring the state parameters of the transformer in real time, diagnosing and polling the state parameters of the transformer on the non-power-loss incoming line, and if the transformer is not overloaded after running for a period of time, unloading a three-level load is not needed; and if the transformer is overloaded and the utilization rate of the transformer load is overhigh, alarming, inquiring the priorities of all three-level load loops mounted under the transformer bank, and selecting and unloading according to the priorities of the three-level load loops until the utilization rate of the transformer load is reduced to a normal level.
4. The method for maintaining power utilization continuity based on intelligent unloading of the three-level load according to claim 2, wherein the operation of switching and unloading the three-level load according to the judgment of the state parameter of the transformer specifically comprises: monitoring the state parameters of the transformer in real time, diagnosing and polling the state parameters of the transformer on the power-loss-free incoming line, and determining the load allowance of the transformer except for a primary load loop and a secondary load loop; determining a three-level load loop capable of being loaded by the transformer according to the load allowance of the transformer, the priority of the three-level load loop and the capacity information; and unloading the three-stage load loop outside the transformer load capacity range on the non-power-loss inlet wire, and switching to the other non-power-loss inlet wire under the same transformer bank.
5. The method for maintaining power utilization continuity based on intelligent unloading of three-level loads according to claim 1, wherein a power loss of a line is detected in a live condition of the line, and according to the judgment of the state parameters of the transformer, the method further comprises the steps of presetting a first-level load, a second-level load and a third-level load before the operations of switching and unloading the three-level load, and dividing the priority of a three-level load loop.
6. The method for maintaining power utilization continuity based on intelligent unloading of three-level load according to claim 1, wherein the transformer bank refers to a transformer bank relation established by associating transformers on incoming lines of the same power supply range;
when one transformer in the transformer bank is disconnected, the capacities of the other transformers meet the power consumption of the primary load circuit and the secondary load circuit.
7. The method for maintaining power utilization continuity based on intelligent unloading of the three-level load according to claim 3, wherein the switching to the other non-power-loss incoming line under the same transformer bank means that switching is performed through a bus-tie backup automatic switching system to the other non-power-loss incoming line under the same transformer bank, and all loads under the transformer of the power-loss incoming line are mounted under the transformer of the other non-power-loss incoming line under the same transformer bank.
8. The method for maintaining electrical continuity based on intelligent load shedding tertiary load according to claim 3 or 4, wherein the diagnosis and polling of the transformer status parameters on the power-on and power-off incoming lines comprises transformer status diagnosis and transformer status polling.
9. The method for maintaining electrical continuity based on intelligent offloading of tertiary load as recited in claim 8, wherein the transformer status diagnosis is based on obtaining transformer load utilization and load utilization threshold to determine transformer status.
10. The intelligent unloading three-level load continuity-based method for maintaining power utilization continuity according to claim 2 or 9, wherein the method for calculating the transformer load utilization rate comprises the following steps: acquiring the working load of a transformer in a set time period, and determining the maximum load of the transformer according to the working load;
and determining the load utilization rate of the transformer according to the maximum load and the rated load of the transformer.
11. The method for maintaining electrical continuity based on intelligent offloading of tertiary load as recited in claim 3, wherein the alarm of transformer load utilization being too high is that a transformer load utilization exceeds a load utilization alarm threshold, the transformer is monitored and timed, and an alarm is issued when overload operation continues for a period of time exceeding a time limit to indicate that the transformer is overloaded.
12. The intelligent offloading-based three-level load continuity method as recited in claim 3 or 5, wherein the loop priority is an attribute characterizing loop importance.
CN202010458026.6A 2020-05-26 2020-05-26 Method for maintaining power utilization continuity based on intelligent unloading of three-level load Pending CN111555279A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114094593A (en) * 2021-11-22 2022-02-25 广东电网有限责任公司广州供电局 Self-adaptive load control method and system based on real-time monitoring of working condition of transformer
CN114614558A (en) * 2022-03-18 2022-06-10 国网伊犁伊河供电有限责任公司 Self-adaptive acquisition method and device for overload fixed value of spare power automatic switching device
CN115663814A (en) * 2022-12-30 2023-01-31 国网山西省电力公司长治供电公司 220kV transformer substation transformer load reverse connection method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114094593A (en) * 2021-11-22 2022-02-25 广东电网有限责任公司广州供电局 Self-adaptive load control method and system based on real-time monitoring of working condition of transformer
CN114614558A (en) * 2022-03-18 2022-06-10 国网伊犁伊河供电有限责任公司 Self-adaptive acquisition method and device for overload fixed value of spare power automatic switching device
CN115663814A (en) * 2022-12-30 2023-01-31 国网山西省电力公司长治供电公司 220kV transformer substation transformer load reverse connection method

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