CN108306266B - Hybrid direct current breaker with reclosing module and control method thereof - Google Patents
Hybrid direct current breaker with reclosing module and control method thereof Download PDFInfo
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- CN108306266B CN108306266B CN201810227858.XA CN201810227858A CN108306266B CN 108306266 B CN108306266 B CN 108306266B CN 201810227858 A CN201810227858 A CN 201810227858A CN 108306266 B CN108306266 B CN 108306266B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses a hybrid direct current breaker with a reclosing module and a control method thereof, wherein the topology of the traditional hybrid direct current breaker comprises a through current branch, a current breaking branch and an energy consumption branch; the invention improves the traditional topology, and by adding the reclosing module in the current breaking branch, the circuit breaker has flexible reclosing capability after breaking fault current, and can limit the current within a reasonable range in the reclosing process, thereby reducing impact of the reclosing process on a power grid and preventing secondary damage to the system caused by overlarge current when the reclosing process is overlapped with the fault.
Description
Technical Field
The invention relates to the field of direct current circuit breakers in direct current transmission, in particular to a hybrid direct current circuit breaker with a reclosing module and a control method thereof.
Background
In recent years, flexible direct current transmission develops rapidly, and a direct current breaker required for protecting the flexible direct current transmission and a direct current power grid becomes a research hot spot. In an overhead transmission line direct current network, most faults are transient faults. In order to improve the reliability of power transmission, a dc circuit breaker is required to have not only the capability of rapidly breaking a dc current but also the reclosing capability after breaking a fault current.
In the current direct current breaker scheme, the hybrid direct current breaker has the most application prospect. The topology of many hybrid dc circuit breakers are somewhat different, but all have three branches in common: the through-flow branch consists of a mechanical switch and an auxiliary switch, wherein the auxiliary switch is formed by serially and parallelly connecting a small number of fully-controlled devices and is mainly used for transferring fault current; a current interruption branch: the device is formed by connecting a large number of fully-controlled devices in series and parallel and is used for breaking fault current; energy consumption branch: the lightning arrester is composed of a lightning arrester group and is used for absorbing residual energy of a direct current power grid after a circuit breaker is opened. Many topologies of the traditional hybrid direct current circuit breaker do not have reclosing capability, and when reclosing, the reclosing current of some circuit breakers with reclosing capability is large if the circuit breakers are coincident with faults, and secondary damage can be caused to a power grid.
The Chinese patent application with the application number of 201610245174.3, namely a direct current turn-off device and a control method thereof, improves a hybrid direct current breaker, and can realize the reclosing process, but a large number of parallel reclosing modules use full-control devices, so that the investment of the direct current breaker is greatly increased.
Therefore, the topology of the hybrid direct current breaker is improved, the flexible reclosing function is an important content in the design of the direct current breaker on the premise that the investment cost is not greatly increased, the overcurrent when the reclosing process is overlapped with faults is limited, the impact of the reclosing process on a power grid is reduced, and the method has important significance on the safety of the system.
Disclosure of Invention
The invention aims to solve the technical problem of providing a hybrid direct current breaker with a reclosing module and a control method thereof, and the hybrid direct current breaker is improved on the premise of not obviously increasing investment cost, so that the hybrid direct current breaker has flexible reclosing capability, overcurrent in the reclosing process is reduced, and impact on a power grid in the reclosing process is reduced.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a hybrid direct current breaker with reclosing module, includes the through-flow branch road that has mechanical switch K1 and auxiliary switch, has the cutout branch road of main switch and has the power consumption branch road of arrester group the series connection reclosing module in the cutout branch road, reclosing module is parallelly connected by mechanical switch K2 and current-limiting resistor R and forms, current-limiting resistor R's resistance:
wherein: v (V) N For the rated voltage of the system, I N For rated operating current of the system, V m For the maximum transient voltage that the current branch auxiliary switch module can withstand, α is a coefficient less than 1.
Further, α=0.9.
A control method of a hybrid direct current breaker with a reclosing module comprises the following steps:
1) During normal operation, the through-flow branch is conducted, the main switch of the cut-off branch is locked, and the mechanical switch K2 of the reclosing module is closed;
2) Fault breaking process:
201. opening a main switch of the current interruption branch, locking an auxiliary switch of the current interruption branch, and opening a mechanical switch K1 of the current interruption branch after the current is completely transferred to the current interruption branch;
202. after the mechanical switch K1 of the through-flow branch is completely switched off, the main switch of the current-breaking branch is locked, and the residual energy is absorbed by the lightning arrester group of the energy-consuming branch;
203. after the current of the current breaking branch is reduced to zero, a mechanical switch K2 of the reclosing module is disconnected;
3) Reclosing process:
301. receiving a reclosing command, and immediately closing a main switch of the current breaking branch;
302. detecting the electrical quantity of the fault line at the moment, and judging whether the fault exists continuously or not: A. if the fault exists continuously, the main switch of the current-breaking branch is turned on, the residual energy is absorbed by the energy-consuming branch, and reclosing is finished; B. if the fault has been cleared, go to step 303;
303. closing a mechanical switch K1 of the through-flow branch, and opening an auxiliary switch of the through-flow branch; and (3) opening the main switch of the current breaking branch, closing the mechanical switch K2 of the reclosing module, ending the reclosing, and entering a normal running state.
Further, in step 302, determining whether the fault continues to exist in the electrical quantity includes: A. the current rise rate at this time; B. the voltage of the fault side line; C. the voltage across the current limiting resistor R of the reclosing module.
Further, when judging whether the fault is continued or not by the current rising rate at this time, if the fault is superimposed on the fault clearing state, the current rising rate is:
if the current is coincident with a fault, the current rise rate is:
wherein V is N For the rated voltage of the system, I N For rated running current of the system, L is inductance of the system, R is the resistance value of limiting resistor R, R f Is a fault resistance.
Further, when judging whether the fault is continued by the voltage of the fault line, if the fault is overlapped with the fault clearing state, the voltage V of the fault line L The method comprises the following steps:
if the voltage is superposed on the fault, the voltage V at the fault line side L The method comprises the following steps:
wherein V is N For the rated voltage of the system, I N For rated running current of the system, R is the resistance value of a current-limiting resistor R, R f Is a fault resistance.
Further, when judging whether the fault is continued or not by using the voltages at the two ends of the current-limiting resistor R of the reclosing module, if the fault is overlapped with the fault clearing state, the voltage V at the two ends of the resistor in the reclosing module R The method comprises the following steps:
if the voltage is coincident with the fault, the voltage V at two ends of the resistor in the reclosing module R The method comprises the following steps:
wherein V is N For the rated voltage of the system, I N For rated running current of the system, R is the resistance value of a current-limiting resistor R, R f Is a fault resistance.
Compared with the prior art, the invention has the beneficial effects that: 1. according to the invention, the reclosing module is connected in series in the current breaking branch of the hybrid direct current breaker, so that the hybrid direct current breaker has flexible reclosing capability; 2. the reclosing module provided by the invention is formed by connecting a current limiting resistor and a mechanical switch in parallel, so that the investment cost is low, and the investment of the direct current breaker is not increased obviously; 3. the reclosing module and the control method thereof provided by the invention can limit the current of the hybrid direct current breaker in a reasonable range during reclosing, and prevent secondary damage to a power grid during reclosing. 4. In the reclosing module and the control method thereof provided by the invention, all mechanical switches of the circuit breaker are in arc-free action, so that the reclosing module is beneficial to long-term repeated use of the circuit breaker.
Drawings
Fig. 1 is a circuit diagram of an implementation of a hybrid dc circuit breaker having a reclosing module in accordance with the present invention.
Fig. 2 is a flowchart of the operation of the hybrid dc circuit breaker having the reclosing module according to the present invention when the fault is opened.
Fig. 3 is a flowchart of an operation of the hybrid dc circuit breaker having the reclosing module in the present invention at the time of reclosing.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
In the hybrid direct current breaker with the reclosing module, as shown in fig. 1, the reclosing module is formed by connecting a current limiting resistor R and a mechanical switch K2 in parallel, wherein the current limiting resistor R is used for limiting current in the reclosing process, and the mechanical switch K2 is used for switching the resistor. The mechanical switch K2 keeps a closed state in the normal operation and on-off process, and bypasses the current limiting resistor R. After receiving the reclosing command, the mechanical switch K2 is disconnected, the current limiting resistor R is put into the power grid, and the current limiting resistor R is connected in series to limit transient current in the reclosing process. The current limiting resistor R is calculated in the following way:
wherein: v (V) N For the rated voltage of the system, I N For rated operating current of the system, V m For the maximum transient voltage that the current branch auxiliary switch module can withstand, α is a coefficient smaller than 1, and is recommended to be 0.9 as a safety margin.
The control method of the hybrid direct current breaker comprises the following steps:
1. during normal operation, the mechanical switch K1 of the current-through branch and the auxiliary switch are conducted, the main switch of the current-breaking branch is opened, and the mechanical switch K2 of the reclosing module is closed; the steady-state current flows through the mechanical switch K1 and the auxiliary switch of the through-flow branch, wherein the auxiliary switch is formed by serially and parallelly connecting a small number of fully-controlled semiconductor switching devices, and can be a bridge structure or other through-flow modules commonly used in the prior art.
2. The fault breaking process is as shown in fig. 2:
1. opening a main switch of the current-breaking branch, opening an auxiliary switch of the current-breaking branch, and opening a mechanical switch K1 of the current-breaking branch after the current is completely transferred to the current-breaking branch, wherein the current is completely transferred to the current-breaking branch;
2. after the mechanical switch K1 of the current-through branch is completely switched off, the main switch of the current-interruption branch is switched off, and the residual energy is absorbed by the energy-consumption branch which is formed by a lightning arrester group;
3. and opening a mechanical switch K3 of the reclosing module.
3. The reclosing process is as shown in fig. 3:
1. when a reclosing command is received, a main switch of the current-breaking branch is closed, and at the moment, a current-limiting resistor R of a reclosing module is connected in series into a power grid, so that reclosing current can be limited, and secondary damage to the power grid caused by overlarge current when reclosing to a fault is prevented;
2. the electrical quantity such as the voltage and the current of the fault line at this time is detected, whether the fault exists continuously or not is judged, and the electrical quantity for judging whether the fault exists continuously or not can be any one of the following: 1) The current rise rate at this time; 2) The voltage of the fault side line; 3) The voltage across the current limiting resistor R in the reclosing module.
The electric quantity is calculated by the following steps:
A. current rise rate:
if the fault clearing state is coincident, the current rise rate is:
if the current is coincident with a fault, the current rise rate is:
wherein V is N For the rated voltage of the system, I N For rated operation current of the system, L is inductance of the system, R f Is a fault resistance.
B. Voltage of fault side line:
if the voltage coincides with the fault clearing state, the voltage at the fault line side is:
if the voltage is overlapped with the fault, the voltage at the fault line side is as follows:
wherein V is N For the rated voltage of the system, I N For rated operating current of system, R f Is a fault resistance.
C. Voltage across resistor in reclosing module:
if the voltage is coincident with the fault clearing state, the voltage V at two ends of the resistor in the reclosing module R The method comprises the following steps:
if the voltage is coincident with the fault, the voltage V at two ends of the resistor in the reclosing module R The method comprises the following steps:
wherein V is N For the rated voltage of the system, I N For rated operating current of system, R f Is a fault resistance.
(1) If the fault persists: the main switch of the current breaking branch is closed, the residual energy is absorbed by the energy consumption branch, and reclosing is finished;
(2) If the fault has been cleared: and closing the mechanical switch of the through-flow branch, closing the auxiliary switch of the through-flow branch, locking the main switch of the current-breaking branch, closing the mechanical switch K2 of the reclosing module after the current of the current-breaking branch is reduced to 0, and entering a normal running state after the reclosing is finished.
Claims (5)
1. The control method of the hybrid direct current breaker with the reclosing module is characterized in that the hybrid direct current breaker with the reclosing module comprises a through-flow branch circuit with a mechanical switch K1 and an auxiliary switch, a cut-off branch circuit with a main switch and an energy consumption branch circuit with a lightning arrester group, and the control method is characterized in that the reclosing module is connected in series in the cut-off branch circuit and is formed by connecting a mechanical switch K2 and a current limiting resistor R in parallel, and the resistance value of the current limiting resistor R is as follows:
wherein: v (V) N For the rated voltage of the system, I N For rated operating current of the system, V m The maximum transient voltage which can be born by the auxiliary switch module of the through-flow branch is represented by alpha which is a coefficient smaller than 1;
the control method comprises the following steps:
1) During normal operation, the through-flow branch is conducted, the main switch of the cut-off branch is locked, and the mechanical switch K2 of the reclosing module is closed;
2) Fault breaking process:
201. opening a main switch of the current interruption branch, locking an auxiliary switch of the current interruption branch, and opening a mechanical switch K1 of the current interruption branch after the current is completely transferred to the current interruption branch;
202. after the mechanical switch K1 of the through-flow branch is completely switched off, the main switch of the current-breaking branch is locked, and the residual energy is absorbed by the lightning arrester group of the energy-consuming branch;
203. after the current of the current breaking branch is reduced to zero, a mechanical switch K2 of the reclosing module is disconnected;
3) Reclosing process:
301. receiving a reclosing command, and immediately closing a main switch of the current breaking branch;
302. detecting the electrical quantity of the fault line at the moment, and judging whether the fault exists continuously or not: A. if the fault exists continuously, the main switch of the current-breaking branch is turned on, the residual energy is absorbed by the energy-consuming branch, and reclosing is finished; B. if the fault has been cleared, go to step 303;
303. closing a mechanical switch K1 of the through-flow branch, and opening an auxiliary switch of the through-flow branch; and (3) opening the main switch of the current breaking branch, closing the mechanical switch K2 of the reclosing module, ending the reclosing, and entering a normal running state.
2. The control method according to claim 1, wherein determining whether the fault continues to exist in the electrical quantity in step 302 includes: A. the current rise rate at this time; B. the voltage of the fault side line; C. the voltage across the current limiting resistor R of the reclosing module.
3. The control method according to claim 2, wherein when judging whether the fault is continued or not at the current rise rate at that time, if the fault is superimposed on the fault clearing state, the current rise rate is:
if the current is coincident with a fault, the current rise rate is:
wherein V is N For the rated voltage of the system, I N For rated running current of the system, L is inductance of the system, R is the resistance value of limiting resistor R, R f Is a fault resistance.
4. The control method as set forth in claim 2, wherein the voltage V on the fault line side is determined by the voltage on the fault line side if the fault is coincident with the fault clearing state when the fault is continued L The method comprises the following steps:
if the voltage is superposed on the fault, the voltage V at the fault line side L The method comprises the following steps:
wherein V is N For the rated voltage of the system, I N For rated running current of the system, R is the resistance value of a current-limiting resistor R, R f Is a fault resistance.
5. The control method as claimed in claim 2, wherein the voltage across the resistor in the reclosing module is V when the fault is coincident with the fault clearing state when the voltage across the current limiting resistor R of the reclosing module is used to determine whether the fault is continued R The method comprises the following steps:
if the voltage is coincident with the fault, the voltage V at two ends of the resistor in the reclosing module R The method comprises the following steps:
wherein V is N For the rated voltage of the system, I N For rated running current of the system, R is the resistance value of a current-limiting resistor R, R f Is a fault resistance.
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| CN109167379B (en) * | 2018-09-20 | 2020-01-07 | 四川大学 | Coordination control method for converter station and direct current circuit breaker of flexible direct current system |
| CN109494693A (en) * | 2018-11-16 | 2019-03-19 | 北京交通大学 | A kind of hybrid dc circuit breaker and control method reducing reclosing impact |
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| CN105356411A (en) * | 2015-11-10 | 2016-02-24 | 南京南瑞继保电气有限公司 | Bridge circuit, high voltage DC circuit breaker and control method thereof |
| CN105680409A (en) * | 2016-04-19 | 2016-06-15 | 南京南瑞继保电气有限公司 | Bridge circuit, direct current disjunction device and control method thereof |
| CN105790236A (en) * | 2016-04-19 | 2016-07-20 | 南京南瑞继保电气有限公司 | DC turn-off apparatus and control method thereof |
| WO2018028247A1 (en) * | 2016-08-09 | 2018-02-15 | 南京南瑞继保电气有限公司 | Closing control method for high-voltage direct-current circuit breaker |
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| CN208015359U (en) * | 2018-03-20 | 2018-10-26 | 四川大学 | A kind of hybrid dc circuit breaker with reclosing module |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356411A (en) * | 2015-11-10 | 2016-02-24 | 南京南瑞继保电气有限公司 | Bridge circuit, high voltage DC circuit breaker and control method thereof |
| CN105680409A (en) * | 2016-04-19 | 2016-06-15 | 南京南瑞继保电气有限公司 | Bridge circuit, direct current disjunction device and control method thereof |
| CN105790236A (en) * | 2016-04-19 | 2016-07-20 | 南京南瑞继保电气有限公司 | DC turn-off apparatus and control method thereof |
| WO2018028247A1 (en) * | 2016-08-09 | 2018-02-15 | 南京南瑞继保电气有限公司 | Closing control method for high-voltage direct-current circuit breaker |
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