CN113013883A - Mobile power flow control and ice melting system and control method - Google Patents
Mobile power flow control and ice melting system and control method Download PDFInfo
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- CN113013883A CN113013883A CN202110258217.2A CN202110258217A CN113013883A CN 113013883 A CN113013883 A CN 113013883A CN 202110258217 A CN202110258217 A CN 202110258217A CN 113013883 A CN113013883 A CN 113013883A
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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Abstract
The invention discloses a mobile power flow control and ice melting system, which comprises a centralized control system and power flow control and ice melting systems arranged on each phase of electricity, wherein the power flow control and ice melting system comprises N centralized series-connected series compensation modules, the N centralized series-connected series compensation modules are arranged in at least one container, N is a natural number and is more than 1, each series compensation module comprises a current conversion unit, an energy taking unit, a control unit and a first type of bypass equipment, and the current conversion unit is electrically connected with the energy taking unit and the first type of bypass equipment. The invention also discloses a control method of the mobile power flow control and ice melting system. According to the invention, the optimal control of the power flow of different areas of the power grid in different periods can be realized in a movable manner according to the structure and the working condition of the power grid, the ice melting of different lines of the power grid is realized, the running performance and the reliability of the whole system are improved, and the advantage of optimizing the power flow of the system by the series compensator is better exerted.
Description
Technical Field
The invention relates to the technical field of flexible power transmission of a power system, in particular to a mobile power flow control and ice melting system and a control method.
Background
With the interconnection of large-scale power systems and the use of various new devices, the scale and complexity of the power systems are increased while the power generation and transmission are more economical and efficient; in addition, a large number of distributed power generation systems are connected into a power grid, so that the traditional fixed power flow transmitted from the power transmission network to the power distribution network is reversed; the continuous increase of user load requires a power flow control means to improve the existing power transmission capability; the complex exchange of power between the booming smart grid and the electricity market requires frequent tidal current optimization control. On the other hand, the ice coating of the power transmission line in winter seriously threatens the safe operation of the power system, in 2008, long-time and large-scale rain, snow and ice weather attacks the south of China, tens of millions of power grid equipment are seriously damaged, large-area power failure accidents occur, and huge loss is brought to social economy; at present, a plurality of ice melting devices are applied in China, and most of the ice melting devices adopt an alternating current short circuit ice melting method and a direct current ice melting method, and the two methods need to stop running an ice-covered line, so that certain influence is caused on the safe and stable running of a power grid.
The movable series compensator can arrange or intensively connect a plurality of small-capacity compensators to a power line, realizes the power flow control function and effect similar to those of a static synchronous series compensator, can provide a more flexible and advanced control means for an intelligent power grid, and effectively improves the power supply capacity and the safety and stability of a power system. The movable series compensator has the characteristics of small volume, movability and the like; meanwhile, the movable series compensation device can be movably arranged on different power transmission lines or substations, and the problem of power flow of different areas and different time periods of a power grid is solved.
At present, the foreign demonstration project (distributed static synchronous series compensator) of the mobile series compensator adopts a module local control mode, the control mode is inflexible, the performance of power flow regulation is poor, and the ice melting function is not provided. Distributed series compensators (distributed series reactors, distributed static synchronous series compensators, distributed power flow controllers and the like) are developed in some colleges and scientific research institutions in China, researches are mainly carried out on topological structures, simulation modeling and control strategies, and no report about the research of mobile power flow controllers is available.
In order to fully exert the characteristic of the power flow optimization of the series compensator, improve the transmission capacity and the safety and stability of a power system, and promote the rapid development of the application of the power flow controller, a movable power flow controller with the ice melting function, which has more comprehensive functions and is more suitable for engineering application, is required.
Disclosure of Invention
The invention mainly solves the technical problems that the original power grid power flow control mode is inflexible, has poor regulation performance and does not have the ice melting function; the mobile power flow control and ice melting system and the control method can realize power flow optimization control on different regions of the power grid in different periods in a mobile mode according to the structure and the working condition of the power grid, realize ice melting on different lines of the power grid, improve the running performance and the reliability of the whole system, and better exert the advantage of optimizing the power flow of the system by the series compensator.
The technical problem of the invention is mainly solved by the following technical scheme: the invention relates to a mobile power flow control and ice melting system, which comprises a centralized control system and power flow control and ice melting systems arranged on each phase of electricity, wherein the power flow control and ice melting system comprises N series compensation modules which are arranged in a centralized and serial manner, the N series compensation modules which are arranged in the centralized and serial manner are arranged in at least one container, N is a natural number and is greater than 1, each series compensation module comprises a current conversion unit, an energy taking unit, a control unit and first-class bypass equipment, the current conversion unit is electrically connected with the energy taking unit and the first-class bypass equipment, the centralized control system is used for receiving a power flow optimization control instruction and an ice melting current instruction of a dispatching control layer, converting the power flow optimization control instruction and the ice melting current instruction into an injection voltage instruction of the series compensation modules and sending the injection voltage instruction into the control unit, and the control unit is used for converting the injection voltage instruction into a switching-on command and a switching-off A stream unit.
According to the power grid structure and the working conditions, the tide optimization control of different areas of the power grid in different periods can be movably realized, the ice melting of different lines of the power grid is realized, the running performance and the reliability of the whole system are improved, and the advantage of optimizing the tide of the system by the series compensator is better exerted.
Preferably, the current conversion unit includes 4 power transistors, a resistor and a capacitor, the 4 power transistors are electrically connected in a full bridge type, a first pin of the power transistor electrically connected in a full bridge type is electrically connected with one end of the resistor and one end of the capacitor, a third pin of the power transistor electrically connected in a full bridge type is electrically connected with the other end of the resistor and the other end of the capacitor, a second pin of the power transistor electrically connected in a full bridge type is electrically connected with the energy obtaining unit and one end of the first type of bypass device, and a fourth pin of the power transistor electrically connected in a full bridge type is electrically connected with the other end of the first type of bypass device.
Preferably, the energy obtaining unit is a current transformer.
The energy taking unit is used for collecting the current value output to the power transmission line by each series compensation module and feeding the current value back to the centralized control system, so that the centralized control system can conveniently control and adjust in real time.
Preferably, the first bypass device is a mechanical switch or a fast switch composed of power electronics, and the on and off of the first bypass device is controlled by the control unit.
Preferably, the mobile power flow control and ice melting system further comprises a second bypass device, the second bypass device is connected in parallel with the N series compensation modules which are connected in series in a centralized manner, and the opening and closing sections of the second bypass device are controlled by the centralized control system.
Preferably, the second type of bypass device is a fast mechanical bypass switch, and the closing time of the fast mechanical bypass switch is shorter than the opening time.
The stability and reliability of power transmission in the power flow control or ice melting control process of the power transmission line are ensured.
The invention discloses a control method of a mobile power flow control and ice melting system, which comprises the following steps:
selecting one power transmission line from a plurality of power transmission lines and installing a mobile type power flow control and ice melting system;
judging whether the transmission line coated with ice or possibly coated with ice is the transmission line provided with the mobile type power flow control and ice melting system;
if the transmission line coated with ice or possibly coated with ice is the transmission line provided with the mobile power flow control and ice melting system, the dispatching control layer issues an ice melting current instruction to the centralized control system, the centralized control system converts the ice melting current instruction into an injection voltage instruction of each series compensation module and sends the injection voltage instruction to the control unit of each series compensation module, the control unit of each series compensation module coordinately controls the current of the transmission line provided with the mobile power flow control and ice melting system to reach an instruction value, and ice melting is carried out through heat dissipation after the current flows through the transmission line;
if the transmission line which is or is possible to be iced is the transmission line which is not provided with the mobile power flow control and ice melting system, the dispatching control layer issues ice melting current instructions of other lines to the centralized control system, the centralized control system converts the ice melting current instructions into injection voltage instructions of all the series compensation modules and sends the injection voltage instructions to the control units of all the series compensation modules, the control units of all the series compensation modules coordinate to control the current of the transmission line which is not provided with the mobile power flow control and ice melting system to reach an instruction value, and ice melting is carried out through heat dissipation after the current flows through the transmission line.
According to the power grid structure and the working conditions, the tide optimization control of different areas of the power grid in different periods can be movably realized, the ice melting of different lines of the power grid is realized, the running performance and the reliability of the whole system are improved, and the advantage of optimizing the tide of the system by the series compensator is better exerted.
Preferably, the control method of the mobile power flow control and ice melting system further comprises the following steps:
installing a mobile power flow control and ice melting system on each power transmission line in a plurality of power transmission lines;
when one of the plurality of power transmission lines is iced or is likely to be iced, the scheduling control layer issues an ice-melting current instruction to the centralized control system, the centralized control system converts the ice-melting current instruction into an injection voltage instruction of each series compensation module and sends the injection voltage instruction to the control units of each series compensation module, the control units of each series compensation module coordinate to control the current of the iced or likely-iced power transmission line to reach an instruction value, and ice melting is performed through heat dissipation of the power transmission line after the current flows through the power transmission line.
Preferably, the ice-melting current instruction comprises: increasing an ice melting current instruction corresponding to the power transmission line needing ice melting to the required current; or the sum of the ice melting current instruction corresponding to the transmission line needing ice melting and the ice melting current instruction corresponding to the other transmission lines not needing ice melting is always kept unchanged; or according to the power grid load flow optimization requirement, continuously adjusting the sum of the ice melting current instruction corresponding to the power transmission line needing ice melting and the ice melting current instruction corresponding to the other power transmission lines not needing ice melting.
The invention has the beneficial effects that: according to the structure and the working condition of the power grid, the tide optimization control of different areas of the power grid in different periods can be realized in a movable mode, the ice melting of different lines of the power grid is realized, the running performance and the reliability of the whole system are improved, and the advantage of optimizing the tide of the system by the series compensator is better exerted; the mobile power flow control and ice melting system is simple in wiring, can realize accurate power flow control, does not need to stop running an ice-covered line during ice melting, and is suitable for engineering application.
Drawings
Fig. 1 is a schematic structural diagram of a mobile power flow control and ice melting system of the present invention.
Fig. 2 is another schematic structural diagram of the mobile power flow control and ice melting system of the invention.
In the figure, 1, a centralized control system, 2, a series compensation module, 3, a container, 4, second-class bypass equipment, 5, a power transmission line, 21, a current conversion unit, 22, an energy acquisition unit, 23, a control unit, 24 and first-class bypass equipment.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): the mobile power flow control and ice melting system of the embodiment comprises a centralized control system 1 and power flow control and ice melting systems arranged on each phase of electricity, wherein the power flow control and ice melting systems arranged on each phase of electricity are connected in series into a power transmission line 5, each power flow control and ice melting system comprises N centralized series-connected series compensation modules 2, the N centralized series-connected series compensation modules are arranged in a container 3, N is a natural number and is greater than 1, each series compensation module comprises a current conversion unit 21, an energy taking unit 22, a control unit 23 and a first bypass device 24, each current conversion unit comprises 4 power tubes, a resistor and a capacitor, a first pin of the 4 power tubes which are electrically connected with the power tubes in a full bridge manner is electrically connected with one end of the resistor and one end of the capacitor, a third pin of the power tubes which are electrically connected with the other end of the resistor and the other end of the capacitor, the second pin of the power tube full-bridge type electric connection is electrically connected with the energy taking unit and one end of the first type of bypass equipment, and the fourth pin of the power tube full-bridge type electric connection is electrically connected with the other end of the first type of bypass equipment.
In this embodiment, the energy obtaining unit is a current transformer, the first-type bypass device is a mechanical switch or a fast switch composed of power electronic devices, and the on and off of the first-type bypass device is controlled by the control unit.
The power flow control and ice melting system further comprises a second bypass device 4, the second bypass device is connected with the N series compensation modules which are connected in series in a centralized mode in parallel, the opening and closing sections of the second bypass device are controlled by the centralized control system, in the embodiment, the second bypass device is a quick mechanical bypass switch, and the closing time of the quick mechanical bypass switch is shorter than the opening time of the quick mechanical bypass switch.
The principle of the power flow control in the mobile power flow control and ice melting system of the embodiment is as follows: according to the structure and the working condition of the power grid, a mobile type power flow control and ice melting system is installed in the power transmission lines in different areas of the power grid in different periods, and a scheduling control layer issues a power flow optimization control instruction to a centralized control system; the centralized control system converts the power flow optimization control instruction into an injection voltage instruction of each series compensation module and then sends the injection voltage instruction to a control unit of each series compensation module, the control unit converts the injection voltage instruction into a switching-on and switching-off command of a power electronic device in a current conversion unit and sends the switching-on and switching-off command to the current conversion unit, the control unit controls the switching-on and switching-off of first-class bypass equipment, the switching-on and switching-off of the first-class bypass equipment are the same as the switching-on and switching-off command of the power electronic device in the current conversion unit, when the control unit sends the switching-on and switching-off command to the first-class bypass equipment, the centralized control system sends an opposite command to second-class bypass equipment at the same time, and each series compensation module coordinately controls line current of a mobile.
The control method of the mobile power flow control and ice melting system of the embodiment is applicable to the mobile power flow control and ice melting system shown in fig. 1, and comprises the following steps:
selecting one power transmission line from a plurality of power transmission lines and installing a mobile type power flow control and ice melting system;
judging whether the transmission line coated with ice or possibly coated with ice is the transmission line provided with the mobile type power flow control and ice melting system;
if the transmission line coated with ice or possibly coated with ice is the transmission line provided with the mobile power flow control and ice melting system, a scheduling control layer issues an ice melting current instruction to a centralized control system, the centralized control system converts the ice melting current instruction into an injection voltage instruction of each series compensation module and sends the injection voltage instruction to a control unit of each series compensation module, the control unit converts the injection voltage instruction into an opening and closing instruction of a power electronic device in a current conversion unit and sends the opening and closing instruction to the current conversion unit, the control unit controls the opening and closing of first-class bypass equipment, the opening and closing of the first-class bypass equipment are the same as the opening and closing instruction of the power electronic device in the current conversion unit, when the control unit sends the opening and closing instruction to the first-class bypass equipment, the centralized control system sends an opposite instruction to second-class bypass equipment at the same time, and the control units of each series compensation module coordinate and control to enable the transmission When the current of the line reaches the instruction value, the ice melting is carried out through the heat dissipation of the power transmission line after the current flows through the power transmission line;
if the transmission line coated with ice or possibly coated with ice is the transmission line without the mobile power flow control and ice melting system, a scheduling control layer issues ice melting current instructions of other lines to a centralized control system, the centralized control system converts the ice melting current instructions into injection voltage instructions of each series compensation module and sends the injection voltage instructions to a control unit of each series compensation module, the control unit converts the injection voltage instructions into switching-on and switching-off commands of power electronic devices in a current conversion unit and sends the switching-on and switching-off commands to the current conversion unit, meanwhile, the control unit controls the switching-on and switching-off of first-class bypass equipment, the switching-on and switching-off of the first-class bypass equipment are the same as the switching-on and switching-off commands of the power electronic devices in the current conversion unit, and when the control unit sends the switching-on and switching-off commands to the, and the control units of all the series compensation modules coordinate and control to enable the current of the power transmission line without the mobile power flow control and ice melting system to reach an instruction value, and ice melting is carried out through heat dissipation after the current flows through the power transmission line.
The control method of the mobile power flow control and ice melting system in the embodiment is applicable to the mobile power flow control and ice melting system shown in fig. 2, and comprises the following steps:
installing a mobile power flow control and ice melting system on each power transmission line in a plurality of power transmission lines;
when one of the plurality of power transmission lines is iced or is likely to be iced, the scheduling control layer issues an ice-melting current instruction to the centralized control system, the centralized control system converts the ice-melting current instruction into an injection voltage instruction of each series compensation module and sends the injection voltage instruction to the control units of each series compensation module, the control units of each series compensation module coordinate to control the current of the iced or likely-iced power transmission line to reach an instruction value, and ice melting is performed through heat dissipation of the power transmission line after the current flows through the power transmission line.
Wherein the ice-melting current instruction comprises: increasing an ice melting current instruction corresponding to the power transmission line needing ice melting to the required current; or the sum of the ice melting current instruction corresponding to the transmission line needing ice melting and the ice melting current instruction corresponding to the other transmission lines not needing ice melting is always kept unchanged; or according to the power grid load flow optimization requirement, continuously adjusting the sum of the ice melting current instruction corresponding to the power transmission line needing ice melting and the ice melting current instruction corresponding to the other power transmission lines not needing ice melting.
According to the embodiment, the tide optimization control of different areas of the power grid in different periods can be movably realized according to the structure and the working condition of the power grid, the ice melting of different lines of the power grid is realized, the running performance and the reliability of the whole system are improved, and the advantage of optimizing the tide of the system by the series compensator is better exerted; the mobile power flow control and ice melting system is simple in wiring, can realize accurate power flow control, does not need to stop running an ice-covered line during ice melting, and is suitable for engineering application.
Claims (9)
1. A mobile type power flow control and ice melting system is characterized by comprising a centralized control system and power flow control and ice melting systems arranged on each phase of electricity, wherein each power flow control and ice melting system comprises N series compensation modules which are arranged in a centralized and serial mode, the N series compensation modules which are arranged in the centralized and serial mode are arranged in at least one container, N is a natural number and is greater than 1, each series compensation module comprises a current conversion unit, an energy taking unit, a control unit and first-class bypass equipment, the current conversion unit is electrically connected with the energy taking unit and the first-class bypass equipment, the centralized control system is used for receiving a power flow optimization control instruction and an ice melting current instruction of a dispatching control layer, converting the power flow optimization control instruction and the ice melting current instruction into an injection voltage instruction of the series compensation modules and sending the injection voltage instruction and the ice melting current instruction to the control unit, and the control unit is used for converting the injection voltage instruction into a switching-on command And sending the signals to a commutation unit.
2. The mobile power flow control and ice melting system according to claim 1, wherein the current converting unit comprises 4 power tubes, a resistor and a capacitor, the 4 power tubes are electrically connected in a full bridge manner, a first pin of the power tube in the full bridge manner is electrically connected with one end of the resistor and one end of the capacitor, a third pin of the power tube in the full bridge manner is electrically connected with the other end of the resistor and the other end of the capacitor, a second pin of the power tube in the full bridge manner is electrically connected with the energy obtaining unit and one end of the first type bypass device, and a fourth pin of the power tube in the full bridge manner is electrically connected with the other end of the first type bypass device.
3. The mobile power flow control and ice melting system according to claim 1 or 2, wherein the energy taking unit is a current transformer.
4. The mobile power flow control and ice melting system according to claim 1 or 2, wherein the first bypass device is a mechanical switch or a fast switch composed of power electronics, and the on and off of the first bypass device is controlled by the control unit.
5. The mobile power flow control and ice melting system according to claim 1, further comprising a second type of bypass device, wherein the second type of bypass device is connected in parallel with the N series compensation modules collectively connected in series, and the on and off sections of the second type of bypass device are controlled by the centralized control system.
6. The mobile power flow control and ice melting system as claimed in claim 5, wherein the second bypass device is a fast mechanical bypass switch, and the closing time of the fast mechanical bypass switch is shorter than the opening time.
7. A control method of a mobile power flow control and ice melting system is suitable for the mobile power flow control and ice melting system as claimed in claims 1-6, and is characterized by comprising the following steps:
selecting one power transmission line from a plurality of power transmission lines and installing a mobile type power flow control and ice melting system;
judging whether the transmission line coated with ice or possibly coated with ice is the transmission line provided with the mobile type power flow control and ice melting system;
if the transmission line coated with ice or possibly coated with ice is the transmission line provided with the mobile power flow control and ice melting system, the dispatching control layer issues an ice melting current instruction to the centralized control system, the centralized control system converts the ice melting current instruction into an injection voltage instruction of each series compensation module and sends the injection voltage instruction to the control unit of each series compensation module, the control unit of each series compensation module coordinately controls the current of the transmission line provided with the mobile power flow control and ice melting system to reach an instruction value, and ice melting is carried out through heat dissipation after the current flows through the transmission line;
if the transmission line which is or is possible to be iced is the transmission line which is not provided with the mobile power flow control and ice melting system, the dispatching control layer issues ice melting current instructions of other lines to the centralized control system, the centralized control system converts the ice melting current instructions into injection voltage instructions of all the series compensation modules and sends the injection voltage instructions to the control units of all the series compensation modules, the control units of all the series compensation modules coordinate to control the current of the transmission line which is not provided with the mobile power flow control and ice melting system to reach an instruction value, and ice melting is carried out through heat dissipation after the current flows through the transmission line.
8. The method for controlling the mobile power flow control and ice melting system according to claim 7, further comprising the following steps:
installing a mobile power flow control and ice melting system on each power transmission line in a plurality of power transmission lines;
when one of the plurality of power transmission lines is iced or is likely to be iced, the scheduling control layer issues an ice-melting current instruction to the centralized control system, the centralized control system converts the ice-melting current instruction into an injection voltage instruction of each series compensation module and sends the injection voltage instruction to the control units of each series compensation module, the control units of each series compensation module coordinate to control the current of the iced or likely-iced power transmission line to reach an instruction value, and ice melting is performed through heat dissipation of the power transmission line after the current flows through the power transmission line.
9. The method for controlling the mobile power flow control and ice melting system according to claim 8, wherein the ice melting current command comprises: increasing an ice melting current instruction corresponding to the power transmission line needing ice melting to the required current; or the sum of the ice melting current instruction corresponding to the transmission line needing ice melting and the ice melting current instruction corresponding to the other transmission lines not needing ice melting is always kept unchanged; or according to the power grid load flow optimization requirement, continuously adjusting the sum of the ice melting current instruction corresponding to the power transmission line needing ice melting and the ice melting current instruction corresponding to the other power transmission lines not needing ice melting.
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| CN113889957A (en) * | 2021-09-26 | 2022-01-04 | 武汉理工大学 | Non-contact coupling type ice melting topology based on distributed power flow control and ice melting method |
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