CN110912202A - Safety and stability control method applied to independent power grid - Google Patents
Safety and stability control method applied to independent power grid Download PDFInfo
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- CN110912202A CN110912202A CN201911109369.5A CN201911109369A CN110912202A CN 110912202 A CN110912202 A CN 110912202A CN 201911109369 A CN201911109369 A CN 201911109369A CN 110912202 A CN110912202 A CN 110912202A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- H02J3/12—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
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- 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
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- 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)
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to the technical field of independent power grid control, in particular to a safety and stability control method applied to an independent power grid. The invention realizes the electrolytic aluminum power supply mode of 'alternating current different network and direct current parallel' by utilizing the characteristics of the electrolytic aluminum rectification system in the enterprise independent power grid and utilizing the principle that different alternating current power supplies run in parallel on the direct current side through the rectification system so as to solve the problems existing in the operation, namely the control, of the enterprise independent power grid in the prior art. Under the mode, a control mode of 'load transfer and load removal' under the condition of power failure in the independent power grid is formulated to keep the stability of the power grid, so that the risk of full stop of an electrolytic aluminum enterprise is avoided, and the loss of the electrolytic aluminum enterprise is reduced. The electrolytic aluminum load of the rotatable belt is formulated according to the accident reserve capacity of the public network power supply, so that the public network has the load supporting effect, the loss load is reduced, the electrolytic aluminum production is ensured not to be stopped completely, the most basic residual load is ensured to ensure the heat-preservation security load of the electrolytic cell, and the rapid recovery of the independent power grid is facilitated.
Description
Technical Field
The invention relates to the technical field of independent power grid control, in particular to a safety and stability control method applied to an independent power grid.
Background
Independently operating enterprise grids are relatively weak to operate and are subject to various power disturbances at all times. Different from a conventional large power grid, the independent power grid is low in load level and small in installed capacity, and small disturbance, especially surplus power disturbance or shortage disturbance, can cause large impact on the system. For the enterprise electrolytic aluminum load is essentially a constant power load, which is not very sensitive to load voltage changes and frequency changes. Then, it becomes an inevitable challenge to achieve accurate control of system power and frequency after the system suffers power disturbance for a specific load level in a specific manner.
Especially, the independent power grid with less units and larger unit capacity loses the only large power supply in the independent power grid after 1 unit and unit with larger capacity in the independent power grid have voltage boosting transformation faults or are sent out to a line for tripping. Experience and extensive analysis have shown that for independent grids with relatively weak power supplies, tripping of large units often leads to voltage collapse before frequency collapse. For independently operating enterprise power grids, the direct consequence of voltage collapse is that the slip of the induction motor load (including electrolytic aluminum power load and service power) in the grid rises rapidly to cause stalling.
If 1 unit with large capacity in the independent power grid, unit step-up voltage transformation fault or sending line tripping occurs, a control measure of deep pressure load is adopted, because the proportion of the output of the fault unit to the total load is quite large, the stability of the power grid is difficult to guarantee, the complete stop of the independent power grid is inevitably caused, and great economic loss is brought to enterprises. The prior art cannot solve the technical problems.
Disclosure of Invention
The invention aims to solve the problems existing in the operation and control of the independent power grid of an enterprise in the prior art, and provides a safety and stability control method applied to the independent power grid
In order to achieve the purpose, the invention adopts the following technical scheme:
a safety and stability control method applied to an independent power grid comprises the following steps:
step 1) when the system normally operates, the power supply of the independent power grid is connected with an electrolytic aluminum load, and the power supply of the public power grid is in an empty load state; the trigger angles of thyristors of N rectifier sets supplied with power by an independent power grid are automatically adjusted according to a series rated current constant operation feedback signal to meet the normal production of an electrolysis series;
step 2) when 1 large-capacity unit in the independent power grid trips, the safety and stability control system executes a load switching command to the electrolytic aluminum control system, and the electrolytic aluminum control system realizes that partial loads of electrolytic aluminum are connected by M rectifier units powered by a public power grid according to the received load switching command; or the safety and stability control system executes a command of 'load transfer and load pressing' to the electrolytic aluminum control system, the electrolytic aluminum control system simultaneously finishes partial load of electrolytic aluminum according to the received 'load transfer and load pressing' command, M rectifier units powered by a public network power supply are connected with the electrolytic aluminum, and N rectifier units powered by an independent power grid adjust the trigger angle of the thyristor according to the 'load pressing' command to reduce the load, and the power grid is ensured to run stably.
Further, in the step 2), the safety and stability control system determines the power disturbance quantity Px before the fault and the maximum transfer power Pt according to the power shortage quantity R corresponding to each Hz frequency drop, the frequency correction coefficient KF of the load transfer band and the pressure load correction coefficient KL, judges the frequency drop amplitude Fd and the pressure load quantity LS after the load transfer band, and then sends a "load transfer band" command or a "load transfer band + pressure load" command to the electrolytic aluminum control system.
Further, the logic of the safety and stability control system in the step 2) executes the following steps:
1) according to a grid structure, setting a power deficit R, a frequency correction coefficient KF of a load transfer band and a voltage load correction coefficient KL corresponding to each Hz frequency drop;
2) in the actual power grid operation process, when 1 large-capacity unit trips, a safety and stability control system is started logically, and the pre-fault power disturbance quantity Px value and the maximum transfer power Pt are determined;
3) if the power disturbance quantity Px is smaller than the power shortage quantity R corresponding to each Hz frequency drop, the stable operation of the power grid can be ensured by depending on the frequency modulation capability of other units in the independent power grid network, no safety and stability measures are taken any more, and the control logic is finished;
4) if the power disturbance quantity Px is larger than or equal to the power shortage quantity R corresponding to each Hz frequency drop, the set logic calculates the frequency drop amplitude Fd after the load is transferred, and Fd = KF x (Px-Pt)/R;
5) if the frequency drop amplitude Fd after the load is transferred is less than 1.0, the stability control system executes a load transfer command to the electrolytic aluminum control system, the control logic is finished, and the electrolytic aluminum control system immediately executes the command after receiving the command, so that the connection of M rectifier units of which the electrolytic aluminum part load is supplied with power by a public network power supply is realized;
6) if the frequency drop amplitude Fd after the load is transferred to the belt is larger than or equal to 1.0, the stability control system calculates the pressure load LS = KL { Px-Pt-Rx (1+ KF)/KF/2} according to the set logic, determines the electrolytic aluminum pressure load, simultaneously sends a load transfer belt + pressure load command to the electrolytic aluminum control system according to the maximum transfer power Pt and the calculation result, and the electrolytic aluminum control system receives the command, finishes partial loads of the electrolytic aluminum, adjusts the trigger angle of the thyristor according to the pressure load command and adjusts the thyristor trigger angle to reduce the loads by M rectifier sets connected with the belt of the public network power supply and N rectifier sets supplied with power by the independent power grid.
Compared with the prior art, the invention has the following beneficial effects: the invention realizes the electrolytic aluminum power supply mode of 'alternating current different network and direct current parallel' by utilizing the characteristics of the electrolytic aluminum rectification system in the independent power grid of the enterprise and utilizing the principle that different alternating current power supplies run in parallel at the direct current side through the rectification system. Under the mode, a control mode of 'load transfer and load removal' under the condition of power failure in the independent power grid is formulated to keep the stability of the power grid, so that the risk of full stop of an electrolytic aluminum enterprise is avoided, and the loss of the electrolytic aluminum enterprise is reduced. The main characteristic is that the electrolytic aluminium load of the rotatable belt is made according to the accident reserve capacity of the public network power supply, so that the public network can play a role of load support, the loss load is reduced, the full stop of the electrolytic aluminium production series is ensured, the most basic residual load is ensured to ensure the heat preservation safety load of the electrolytic cell, and the quick recovery of the independent power grid is facilitated.
The invention solves the problem of insufficient power supply caused by tripping of the units in the network in the operation process of the independent power grid, and realizes load transfer by using the public network accident standby power supply. The control mode of 'load transfer belt + pressure load' is adopted, so that the load amount of the cut-off is effectively reduced, and the stable operation of the independent power grid and the economic benefit of enterprises are facilitated.
Drawings
FIG. 1 is a logic diagram of the present invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
A safety and stability control method applied to an independent power grid comprises the following steps:
step 1) when the system normally operates, the power supply of the independent power grid is connected with an electrolytic aluminum load, and the power supply of the public power grid is in an empty load state; the trigger angles of thyristors of N rectifier sets supplied with power by an independent power grid are automatically adjusted according to a series rated current constant operation feedback signal to meet the normal production of an electrolysis series;
step 2) when 1 large-capacity unit in the independent power grid trips, the safety and stability control system executes a load transfer command to the electrolytic aluminum control system, wherein the electrolytic aluminum control system is a control system on the existing electrolytic aluminum; or the safety and stability control system executes a command of 'load transfer and load pressing' to the electrolytic aluminum control system, the electrolytic aluminum control system simultaneously finishes partial load of electrolytic aluminum according to the received 'load transfer and load pressing' command, M rectifier units powered by a public network power supply are connected with the electrolytic aluminum, and N rectifier units powered by an independent power grid adjust the trigger angle of the thyristor according to the 'load pressing' command to reduce the load, and the power grid is ensured to run stably.
The logic execution steps of the safety and stability control system in the step 2) are as follows:
1) and setting a power shortage amount R, a frequency correction coefficient KF of a load transfer band and a voltage load correction coefficient KL corresponding to each Hz frequency drop according to the grid structure.
2) In the actual power grid operation process, when 1 large-capacity unit trips, the safety and stability control system is started logically, and the pre-fault power disturbance quantity Px value and the maximum transfer power Pt are determined.
3) And if the power disturbance quantity Px is smaller than the power shortage quantity R corresponding to each Hz frequency drop, the stable operation of the power grid can be ensured by depending on the frequency modulation capability of other units in the independent power grid network, no safety and stability measures are taken any more, and the control logic is finished.
4) And if the power disturbance quantity Px is greater than or equal to the power shortage quantity R corresponding to each Hz frequency drop, the set logic calculates the frequency drop amplitude Fd after the load is transferred, and Fd = KF x (Px-Pt)/R.
5) If the frequency drop amplitude Fd after the load is transferred is less than 1.0, the stability control system executes a load transfer command to the electrolytic aluminum control system, the control logic is finished, and the electrolytic aluminum control system immediately executes the command after receiving the command, so that the connection (load transfer) of M rectifier units with partial loads of electrolytic aluminum supplied by a public network power supply is realized.
6) If the frequency drop amplitude Fd after the load is transferred to the belt is larger than or equal to 1.0, the stability control system calculates the voltage load LS = KL { Px-Pt-Rx (1+ KF)/KF/2} according to the set logic, determines the electrolytic aluminum voltage load, simultaneously sends a load transfer belt + voltage load command to the electrolytic aluminum control system according to the maximum transfer power Pt and the calculation result, and after receiving the command, the electrolytic aluminum control system finishes part of the load, adjusts the trigger angle of the thyristor according to the voltage load command and reduces the load by M rectifier sets (load transfer belts) powered by a public network power supply and N rectifier sets powered by an independent power grid.
Claims (3)
1. A safety and stability control method applied to an independent power grid is characterized by comprising the following steps:
step 1) when the system normally operates, the power supply of the independent power grid is connected with an electrolytic aluminum load, and the power supply of the public power grid is in an empty load state; the trigger angles of thyristors of N rectifier sets supplied with power by an independent power grid are automatically adjusted according to a series rated current constant operation feedback signal to meet the normal production of an electrolysis series;
step 2) when 1 large-capacity unit in the independent power grid trips, the safety and stability control system executes a load switching command to the electrolytic aluminum control system, and the electrolytic aluminum control system realizes that partial loads of electrolytic aluminum are connected by M rectifier units powered by a public power grid according to the received load switching command; or the safety and stability control system executes a command of 'load transfer and load pressing' to the electrolytic aluminum control system, the electrolytic aluminum control system simultaneously finishes partial load of electrolytic aluminum according to the received 'load transfer and load pressing' command, M rectifier units powered by a public network power supply are connected with the electrolytic aluminum, and N rectifier units powered by an independent power grid adjust the trigger angle of the thyristor according to the 'load pressing' command to reduce the load, and the power grid is ensured to run stably.
2. The safety and stability control method applied to the independent power grid according to claim 1, wherein: and 2) determining the power disturbance quantity Px before the fault and the maximum transfer power Pt by the safety and stability control system according to the power shortage quantity R corresponding to each Hz frequency drop, the frequency correction coefficient KF of the load transfer band and the pressure load correction coefficient KL in the step 2), judging the frequency drop amplitude Fd and the pressure load quantity LS after the load transfer band, and then sending a load transfer band command or a load transfer band + pressure load command to the electrolytic aluminum control system.
3. The safety and stability control method applied to the independent power grid according to claim 2, wherein: the logic execution steps of the safety and stability control system in the step 2) are as follows:
1) according to a grid structure, setting a power deficit R, a frequency correction coefficient KF of a load transfer band and a voltage load correction coefficient KL corresponding to each Hz frequency drop;
2) in the actual power grid operation process, when 1 large-capacity unit trips, a safety and stability control system is started logically, and the pre-fault power disturbance quantity Px value and the maximum transfer power Pt are determined;
3) if the power disturbance quantity Px is smaller than the power shortage quantity R corresponding to each Hz frequency drop, the stable operation of the power grid can be ensured by depending on the frequency modulation capability of other units in the independent power grid network, no safety and stability measures are taken any more, and the control logic is finished;
4) if the power disturbance quantity Px is larger than or equal to the power shortage quantity R corresponding to each Hz frequency drop, the set logic calculates the frequency drop amplitude Fd after the load is transferred, and Fd = KF x (Px-Pt)/R;
5) if the frequency drop amplitude Fd after the load is transferred is less than 1.0, the stability control system executes a load transfer command to the electrolytic aluminum control system, the control logic is finished, and the electrolytic aluminum control system immediately executes the command after receiving the command, so that the connection of M rectifier units of which the electrolytic aluminum part load is supplied with power by a public network power supply is realized;
6) if the frequency drop amplitude Fd after the load is transferred to the belt is larger than or equal to 1.0, the stability control system calculates the pressure load LS = KL { Px-Pt-Rx (1+ KF)/KF/2} according to the set logic, determines the electrolytic aluminum pressure load, simultaneously sends a load transfer belt + pressure load command to the electrolytic aluminum control system according to the maximum transfer power Pt and the calculation result, and the electrolytic aluminum control system receives the command, finishes partial loads of the electrolytic aluminum, adjusts the trigger angle of the thyristor according to the pressure load command and adjusts the thyristor trigger angle to reduce the loads by M rectifier sets connected with the belt of the public network power supply and N rectifier sets supplied with power by the independent power grid.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113141015A (en) * | 2021-03-18 | 2021-07-20 | 云南电网有限责任公司 | Control method for electrolytic aluminum load participating in frequency modulation of transmission-end power grid |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2396761A1 (en) * | 2008-11-14 | 2011-12-21 | Thinkeco Power Inc. | System and method of democratizing power to create a meta-exchange |
| CN103474988A (en) * | 2013-09-10 | 2013-12-25 | 国电南瑞科技股份有限公司 | Emergency control optimization method of electrolytic aluminum self-prepared power grid and based on transient state safety and stability |
| CN104836332A (en) * | 2015-04-29 | 2015-08-12 | 酒泉钢铁(集团)有限责任公司 | Parallel power supplying method of electrolytic aluminum different-power-supply-point direct-current sides |
| CN106600130A (en) * | 2016-12-07 | 2017-04-26 | 国网重庆市电力公司电力科学研究院 | Fuzzy neural network model-based independent microgrid security analysis method |
| CN108808688A (en) * | 2018-07-04 | 2018-11-13 | 云南电网有限责任公司 | A kind of steady control cutting load method based on electrolytic aluminium control characteristic |
-
2019
- 2019-11-13 CN CN201911109369.5A patent/CN110912202A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2396761A1 (en) * | 2008-11-14 | 2011-12-21 | Thinkeco Power Inc. | System and method of democratizing power to create a meta-exchange |
| CN103474988A (en) * | 2013-09-10 | 2013-12-25 | 国电南瑞科技股份有限公司 | Emergency control optimization method of electrolytic aluminum self-prepared power grid and based on transient state safety and stability |
| CN104836332A (en) * | 2015-04-29 | 2015-08-12 | 酒泉钢铁(集团)有限责任公司 | Parallel power supplying method of electrolytic aluminum different-power-supply-point direct-current sides |
| CN106600130A (en) * | 2016-12-07 | 2017-04-26 | 国网重庆市电力公司电力科学研究院 | Fuzzy neural network model-based independent microgrid security analysis method |
| CN108808688A (en) * | 2018-07-04 | 2018-11-13 | 云南电网有限责任公司 | A kind of steady control cutting load method based on electrolytic aluminium control characteristic |
Non-Patent Citations (2)
| Title |
|---|
| 唐长忠: "直供电***中电网调频方式研究", 《电工技术》 * |
| 李鸿源: "火电厂带电解铝的孤网安全稳定控制策略", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113141015A (en) * | 2021-03-18 | 2021-07-20 | 云南电网有限责任公司 | Control method for electrolytic aluminum load participating in frequency modulation of transmission-end power grid |
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Application publication date: 20200324 |