CN110299725B - Thyristor fast switch and protection control circuit and control method thereof - Google Patents
Thyristor fast switch and protection control circuit and control method thereof Download PDFInfo
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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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—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 for distribution gear, e.g. bus-bar systems; for switching devices for switches
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- H02J3/382—
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/04—Modifications for accelerating switching
- H03K17/0403—Modifications for accelerating switching in thyristor switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
- H03K17/08108—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit in thyristor switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0824—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in thyristor switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0009—AC switches, i.e. delivering AC power to a load
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0036—Means reducing energy consumption
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
A thyristor fast switch and protection control circuit and control method thereof, comprising an SF6 circuit breaker, a primary side coupling coil L 1 A coupling coil L 1 The end of the same name is connected with an SF6 circuit breaker and a coupling coil L 1 The different name end side is connected with a thyristor switching module; coupling coil L 2 Different name terminal and coupling coil L 3 The homonymous terminals are connected with a coupling coil L 2 、L 3 Common terminal and diode D 1 Positive pole connected to coupling coil L 3 Different name terminal and diode D 2 The positive electrodes are connected; charging and discharging capacitor C 1 One end is connected with a coupling coil L 2 End of same name, charging and discharging capacitor C 2 One end is connected with a diode D 2 Negative electrode, charge-discharge capacitor C 1 、C 2 The common terminal is respectively connected with a diode D 1 Negative pole, load reactance X L One end of the tube. The SF6 circuit breaker, the sensor unit and the thyristor switching module are all connected with the control unit. The invention can not only promote the rapid switching of the thyristor, but also realize the cooperative protection among the switches by the coordination control method of the main circuit compound switch, thereby reducing the damage caused by the failure of the switches.
Description
Technical Field
The invention relates to a thyristor fast switch, a protection control circuit and a control method thereof, relating to the technical field of switch circuit control.
Background
With the rapid development of national economy, the demand for energy is increasing day by day, the problem of energy shortage is more prominent, and the development and utilization of renewable resources, such as wind energy, solar energy and the like, are inevitable choices for relieving the energy problem. The distributed power supply is a reliable utilization mode of new energy, and due to the characteristics of environmental friendliness, no pollution, flexible installation, high energy utilization rate, capability of effectively reducing transmission loss and the like, a large number of distributed power supplies are connected to a power grid. However, the distributed power supply also has the problems of difficult and unstable control and the like, and meanwhile, the unstable and frequent fluctuation characteristics of the distributed power supply can cause the instantaneous reactive power of the power grid to change frequently, so that the reliable operation of the power system is influenced.
Aiming at the problems of frequent fluctuation of the distributed power supply and the transient reactive power frequent change of the power grid caused by the frequent fluctuation of the distributed power supply, the problem can be solved by adjusting the grid-connected and off-grid power of the distributed power supply or quickly stabilizing the system power. However, due to the frequent fluctuation characteristic of new energy, whether the grid connection and disconnection of the distributed power supply or the system power stability needs to be realized quickly, a switch circuit is needed to realize the quick grid connection and disconnection switching of the distributed power supply or the quick switching of the power compensation unit. The fast grid-connected and off-grid requirements of distributed power supplies and instantaneous reactive power compensation requirements are met, the fast switching requirements cannot be met by common static switches (STS), low-voltage direct-current system fast switches, thyristor fling-cut switches and the like, and the action switches cannot be effectively protected when faults occur, so that the damage to the switches is large.
The traditional quick switch mostly adopts a mechanical contact structure, and the requirements of grid-connected and off-grid switching of a distributed power supply and quick switching of a power compensation unit are difficult to meet. In addition, the thyristor switching circuit with high switching speed has long switching time of switching on and off, cannot meet the requirement of fast switching, and frequent and fast switching of the thyristor can improve the fault occurrence rate, while the semiconductor switch has high cost, and if the switch fails, great economic loss is generated.
Disclosure of Invention
In order to solve the above problems, the invention provides a thyristor fast switch and protection control circuit and a control method thereof, wherein the control circuit has simple structure, convenient control and higher practical value in practical application; the control method can promote the rapid switching of the thyristor, and the coordination control method of the main circuit compound switch can realize the cooperative protection among the switches and reduce the damage caused by the failure of the switches.
The technical scheme adopted by the invention is as follows:
a thyristor fast switch and protection control circuit comprises an SF6 circuit breaker, a primary side coupling coil L 1 Secondary side coupling coil L 2 、L 3 And a charge-discharge capacitor C 1 、C 2 (ii) a Coupling coil L 1 The end of the same name is connected with an SF6 circuit breaker and a coupling coil L 1 The different name end side is connected with a thyristor switching module;
coupling coil L 2 、L 3 In a series configuration, a coupling coil L 2 Different name terminal and coupling coil L 3 The homonymous terminals are connected with a coupling coil L 2 、L 3 Common terminal and diode D 1 Positive pole connected to coupling coil L 3 Different name terminal and diode D 2 The positive electrodes are connected;
charging and discharging capacitor C 1 、C 2 Serially connected, charging and discharging capacitor C 1 One end is connected with a coupling coil L 2 End of same name, charging and discharging capacitor C 2 One end is connected with a diode D 2 Negative electrode, charge-discharge capacitor C 1 、C 2 The common terminal is respectively connected with a diode D 1 Negative pole, load reactance X L One end;
coupling coil L 2 And a charging and discharging capacitor C 1 The common end of the relay is connected with one end of a relay KM1,
diode D 2 Negative electrode and charge-discharge capacitor C 2 The common end is connected with one end of the relay KM 2;
the other end of the relay KM1 and a load reactance X L The other end of the relay KM2 is connected with a terminal A, a terminal B and a terminal C respectively;
the terminal A is a coupling coil L 1 A common end of the thyristor switching module,
The terminal B is a common connection point between the two groups of thyristor modules,
And the terminal C is a common connection point of the tail end of the thyristor switching module and the power equipment.
The thyristor module is of an anti-parallel structure of two thyristors, and a plurality of groups of thyristor modules form the whole thyristor switching module.
The charge and discharge capacitor C 1 The relay KM1, the first thyristor module (1) and the load reactance X L And forming a first auxiliary control loop.
The charge and discharge capacitor C 2 Load reactance X L The second thyristor module (2) and the relay KM2 form an auxiliary control loop II.
The circuit also comprises a sensor unit which is respectively arranged on the main circuit and the auxiliary control loop and sends out a corresponding control command by detecting the change of the current.
And the SF6 circuit breaker is used for controlling the on-off of the main circuit and triggering the switching of the circuit breaker through a manual remote signal or a sensor unit signal.
The SF6 circuit breaker, the sensor unit, the thyristor switching module, the relays KM1 and KM2 are all connected with the control unit.
The invention discloses a thyristor fast switch and protection control circuit and a control method thereof, and the technical effects are as follows:
1: the auxiliary control circuit for the rapid switch of the thyristor consists of three coupling coils, two charging and discharging capacitors, two diodes, two relays and a load impedance, and has the advantages of simple structure, low cost, simple and flexible control and higher application value.
: the thyristor fast switch auxiliary control circuit can promote fast switching on and switching off of the thyristor, and when the thyristor is switched on, the auxiliary circuit provides homodromous current to promote the conduction of the thyristor; when the thyristor is turned off, the auxiliary circuit provides reverse current to promote the turn-off of the thyristor; meanwhile, the main circuit coupling reactance is beneficial to reducing current impact, and the auxiliary control circuit can also reduce current impact and reduce switching loss when being turned off.
: the whole switching circuit is provided with two switching switches of a circuit breaker and a thyristor, cooperative protection between the circuit breaker and the thyristor can be realized by coordinately controlling the on-off of the two switches, and meanwhile, the protection capability of the circuit on the circuit breaker is further improved by the rapid turn-off characteristic of the thyristor.
: the thyristor fast and protection control circuit is particularly suitable for fast grid connection and disconnection requirements of distributed power supplies and instantaneous reactive power compensation.
Drawings
Fig. 1 is a main circuit configuration diagram of the present invention.
FIG. 2 (a) is a first schematic diagram of the circuit operating in different operating modes according to the present invention;
FIG. 2 (b) is a first schematic diagram of the circuit operating in different operating modes according to the present invention;
FIG. 3 (a) is an auxiliary opening flowchart of the present invention;
fig. 3 (b) is a flow chart of the auxiliary shutdown of the present invention.
FIG. 4 (a) is a control block diagram of the thyristor of the present invention operating in an on-state operating state;
fig. 4 (b) is a control block diagram of the thyristor of the present invention operating in an off-state operating state.
Detailed Description
As shown in FIG. 1, a thyristor fast switch and protection control circuit includes an SF6 circuit breaker, a primary side coupling coil L 1 Secondary side coupling coil L 2 、L 3 Charging and discharging capacitor C 1 、C 2 Load reactance X L The device comprises relays KM1 and KM2, a thyristor switching module and a sensor unit.
Coupling coil L 1 The end of the same name is connected with an SF6 circuit breaker and a coupling coil L 1 The different name end side is connected with a thyristor switching module. Coupling coil L 2 、L 3 In a series configuration, a coupling coil L 2 Different name terminal and coupling coil L 3 The homonymous terminals are connected with a coupling coil L 2 、L 3 Common terminal and diode D 1 Positive pole connected to coupling coil L 3 Different name terminal and diode D 2 The positive electrodes are connected. Charging and discharging capacitor C 1 、C 2 Serially connected, charging and discharging capacitor C 1 One end is connected with a coupling coil L 2 End of same name, charging and discharging capacitor C 2 One end is connected with a diode D 2 Negative electrode, charge-discharge capacitor C 1 、C 2 The common terminal is respectively connected with a diode D 1 Negative pole, load reactance X L One end of the tube. Coupling coil L 2 And a charging and discharging capacitor C 1 The public end of the switch is connected with one end of a relay KM1 and a diode D 2 Negative electrode and charge-discharge capacitor C 2 The common end is connected with one end of the relay KM 2; the other end of the relay KM1 and a load reactance X L The other end of the relay KM2 is connected with a terminal A, a terminal B and a terminal C respectively. The terminal A is a coupling coil L 1 A common end of the thyristor switching module,
The terminal B is a common connection point between the two groups of thyristor modules, and the terminal C is a common connection point between the tail end of the thyristor switching module and power equipment.
The thyristor module is of an anti-parallel structure of two thyristors, and a plurality of groups of thyristor modules form the whole thyristor switching module.
The sensor units are respectively arranged on the main circuit and the auxiliary control loop and send out corresponding control commands by detecting the change of current.
The SF6 circuit breaker is used for controlling the on-off of a main circuit, and triggering the switching of the circuit breaker through manual remote signals or sensor unit signals to realize the on-off control of the main circuit and the cooperative protection of a thyristor.
The charge and discharge capacitor C 1 The relay KM1, the first thyristor module (1) and the load reactance X L And forming a first auxiliary control loop.
The charge and discharge capacitor C 2 Load reactance X L The second thyristor module (2) and the relay KM2 form an auxiliary control loop II.
Coupling coil L 1 When the current of the main circuit changes, induced electromotive force and induced current are generated, and the coupling coil L simultaneously 1 Will be in the coupling coil L 2 、L 3 Inducing electromotive force, at this time, coupling coil L 2 、L 3 As a power supply, charging the charge-discharge capacitor; the charge and discharge capacitor is responsible for absorbing the electric energy of the coupling coil and leading the electric energy to pass through a load reactance X L And (4) consumption.
Diode D 1 、D 2 The single-phase conductivity is achieved, and the current flowing direction is controlled by the load; load reactance X L The load unit of the auxiliary loop is responsible for consuming electric energy.
The sensor unit is used for detecting the current of the main circuit, controlling the connection and disconnection of the SF6 circuit breaker and the thyristor, detecting the current of the auxiliary loop, and judging whether the charging and discharging of the capacitor is finished or not and whether the relay is put into use or not. The sensor unit mainly adopts an MP25P1 current sensor manufactured by ABB company, is respectively arranged on a main circuit and an auxiliary control loop, and sends out a corresponding control command by detecting the change of current.
The relays KM1, KM2 and KM3 are used for conducting the thyristor auxiliary control circuit, load main circuit switching of the thyristor switching module and SF6 breaker switching protection.
According to the working principle of the thyristor auxiliary control circuit, firstly, induced electromotive force is generated in a coupling coil according to the current change of a main circuit, then, energy generated by the coil is transferred to a charge-discharge capacitor, and finally, the energy is released through the auxiliary control circuit, wherein the current generated in the circuit discharging process promotes the thyristor to be rapidly switched on and switched off. When the thyristor is switched on, the current of the main circuit is increased, the coupling coil can generate induced electromotive potential energy, and at the moment, the coupling coil L is connected with the thyristor 2 、L 3 The energy of the capacitor charging system can charge the charging and discharging capacitors C1 and C2, and when the voltage of the main circuit is stable and the voltage of the coil is equal to that of the capacitor, the capacitor charging process is finished; the sensor unit detects that the current change of the capacitor branch circuit stops, the control unit controls the relay to be closed, the capacitor discharges through the auxiliary loop, the direction of the loop current is the same as the conduction current direction of the thyristor, and the forward current of the capacitor can promote the conduction process of the thyristor so as to realize the rapid conduction of the thyristor; when the thyristor is turned off, the coupling coil L 2 、L 3 Can generate reverse electromotive force and reversely charge the charging and discharging capacitors C1 and C2, and after the charging is finished, the charging and discharging capacitors C1 and C2 are assisted by the aid of the auxiliary capacitorThe loop discharges, the direction of the loop current is opposite to the direction of the conduction current of the thyristor, and the reverse current can accelerate the turn-off process of the thyristor and realize the rapid turn-off of the thyristor.
The invention relates to a thyristor fast switch and protection control circuit, which respectively works in the following steps: the circuit working principle in different working modes under four operating modes of an opening process, a thyristor on-state, a closing process and a thyristor off-state is shown in fig. 2 (a) and 2 (b), arrows in fig. 2 (a) and 2 (b) represent energy transmission directions, U is 1 Indicating the change of current by the coupling coil L 1 Electromotive force generated, U 2 、U 3 Indicating the coupling coil L 2 、L 3 Induced electromotive force of U C1 、U C2 The capacitor voltage is charged and discharged. The working mode of the circuit is determined by the current state of the main circuit, when the thyristor switching module is switched, the current of the main circuit can be changed, and the auxiliary control loop works to promote the thyristor to be switched quickly; when the thyristor operates in an on state and an off state, whether the switching of the circuit breaker or the thyristor switching module is controlled or not is judged by detecting the change state of the current, so that the coordination of the two switches is realized. The specific operating principle of the circuit is explained as follows:
(1): the SF6 circuit breaker and the thyristor are in a series structure, the on-off control of a circuit can be realized by switching of a single switch device, the long switching time, the large loss and the high manufacturing cost of the SF6 circuit breaker are considered, the thyristor is generally adopted for switching, and the SF6 circuit breaker is kept in a normally closed state. When the SF6 circuit breaker breaks down during working, the thyristor module can be controlled to be turned off, damage to the SF6 circuit breaker is reduced, and the electrical performance of the SF6 circuit breaker is protected. When the thyristor module breaks down in operation, the SF6 circuit breaker can be prevented from being damaged by disconnecting the SF6 circuit breaker. By connecting the two switches in series and detecting the operation state of the switches and the current state of the main circuit, the cooperative protection of the SF6 circuit breaker and the thyristor module is realized, the device damage caused by working faults is avoided, and the overall economic benefit and the circuit switching operation reliability are improved. When the thyristor module operates in an on state, the operation voltage of each thyristor needs to be ensured to be the same, and each thyristor is in a voltage-sharing state. Under the condition that the thyristor modules are in normal voltage-sharing operation, the operation current of the thyristor modules is kept within a certain margin, if a certain thyristor fails in operation, a failed thyristor unit can generate large overcurrent, when the current sensor detects that the operation current is increased and exceeds a threshold value, a current alarm signal is sent to the control unit, and the control unit controls the SF6 circuit breaker to be turned off after receiving the signal, so that the thyristor is prevented from bearing the overcurrent, and the effect of protecting the thyristor is achieved.
The SF6 circuit breaker adopts an LW8-35 type SF6 circuit breaker.
The control unit is programmable controller SIMMENS S7-200SMART CPUST40.
After receiving the alarm signal, the control unit sends a brake-separating signal for controlling the SF6 circuit breaker to be switched off; after the SF6 circuit breaker low-voltage controller receives the opening control signal, the low-voltage controller controls the opening magnet exciting coil to be electrified, the electric appliance unit acts after the coil is electrified, and the opening loop is conducted; and when the switching-off loop is switched on, the operating mechanism controlled by the switching-off loop starts to act, and finally, the switching-off control of the SF6 circuit breaker is realized.
(2): when the thyristor is in an off state, the thyristor has lower leakage current, the forward maximum average leakage current and the reverse maximum average leakage current of the thyristor are both smaller than 100 muA under normal conditions, if the thyristor has larger leakage current due to failure or other reasons in the turn-off process of the thyristor, and the sensor unit detects that the leakage current is increased and exceeds a threshold value, a current alarm signal is sent to the control unit, and the control unit controls the SF6 circuit breaker to be turned off after receiving the signal, so that the thyristor is prevented from being damaged due to the increase of the leakage current.
(3): when the thyristor is turned on, the current of the main circuit is increased and the coil L is coupled on the primary side 1 The voltage (up, positive, down, negative) and the current (main circuit current direction is opposite) are generated in the middle. Due to the primary side coupling coil L 1 There is a voltage, its corresponding coupling coil L 2 、L 3 Induced voltage and current can be generated, the generated induced current can charge the charging and discharging capacitors C1 and C2, and the auxiliary circuit enters a capacitor charging state at the moment. When the main circuit current is stable, the voltage of the primary and secondary side coupling coils is kept constant, generally speaking, the capacitor voltage and the secondary side current are kept constantDifferential pressure, coupling coil L 2 、L 3 And continuously charging the charging and discharging capacitor. When the voltage of the charge-discharge capacitor is the same as the voltage of the secondary side, the charge process of the charge-discharge capacitor is finished, the relay switches of the branches a and C on the right side of the charge-discharge capacitor are closed at this time, the auxiliary circuit enters a capacitor discharge working state, and the auxiliary circuit discharges through the loops 1 and 2, as shown in fig. 2 (a). Because the direction of the loop current is the same as the current direction of the thyristor, the forward current of the loop current can promote the conduction process of the thyristor, and the thyristor is quickly conducted.
(4): when the thyristor is turned off, the main circuit current is reduced, and the primary side coupling coil L 1 The voltage (lower positive and upper negative) and the current (main circuit current direction is the same) are generated in the middle. Due to the primary side coupling coil L 1 There is a voltage, its corresponding coupling coil L 2 、L 3 Induced voltage and induced current can be generated, the current flows into the same-name end, the generated induced current can charge the charging and discharging capacitors C1 and C2, and the circuit enters a capacitor charging state. When the main circuit current stops changing, the coupling coil L 2 、L 3 When no induced current is generated, the charging process of the charge and discharge capacitor is finished, at this time, the relay switches of the branches a and C on the right side of the capacitor are closed, the auxiliary circuit enters a capacitor discharge state, and the auxiliary circuit is discharged through the loops 3 and 4, as shown in fig. 2 (b). Because the direction of the loop current is opposite to the current direction of the thyristor, the reverse current can accelerate the turn-off process of the thyristor, and the thyristor can be turned off quickly.
(5): the fast switching of the thyristor is mainly realized by energy generated by the coupling coil when current changes, energy transfer is realized by controlling charging and discharging of the capacitor, auxiliary control current for promoting switching or turn-off of the thyristor is generated, and fast switching of the thyristor is promoted, and control block diagrams of the fast switching of the thyristor are shown in fig. 3 (a) and fig. 3 (b). Fig. 3 (a) is an auxiliary opening process, when the main circuit is opened, the current is increased, the coupling coil generates an induced potential and carries out forward charging on the charge-discharge capacitor, and the charge-discharge capacitor enters a forward charging state; after the charging is finished, the relay is controlled to be closed, the discharging loop is conducted, the charging and discharging capacitor enters a discharging state, and the rapid conduction of the thyristor is promoted through the loop current of the auxiliary circuit; and after the discharging is finished, the relay is controlled to be disconnected, and the auxiliary control circuit returns to the initial state. Fig. 3 (b) is an auxiliary turn-off process, when the main circuit is turned off, the current is reduced, the coupling coil generates an induced potential and reversely charges the charge-discharge capacitor, and the charge-discharge capacitor enters a reverse charging state; after the charging is finished, the relay is controlled to be closed, the discharging loop is conducted, the charging and discharging capacitor enters a reverse discharging state, and the thyristor is promoted to be rapidly turned off through the loop current of the auxiliary circuit; and after the discharging is finished, the relay is controlled to be disconnected, and the auxiliary control circuit returns to the initial state.
(6): the coordinated protection control between the switches is realized by judging the working states of the thyristors and the circuit breaker. When the thyristor unit has a voltage-sharing problem or the off-state leakage current of the thyristor is too large, the control unit controls the SF6 circuit breaker to be switched off; when the SF6 circuit breaker has operation problems or the cut-off electric arc is too large, the control unit triggers the thyristor to be turned off, and mutual protection of the two switches is realized through the coordination of the switches.
When the thyristor works in an on-state running state, a control block diagram of the thyristor is shown in fig. 4 (a), and the specific process is as follows: firstly, the current of a main circuit is sampled by a current sensori g And the sampling signal is transmitted to the control unit, the control unit judges whether the current signal is kept in the on-state current fluctuation range, and when the detected current exceeds the stability margin, a turn-off control signal is generated to control the circuit breaker to be turned off reliably, so that the damage of the thyristor is avoided.
When the thyristor works in the off-state running state, the control block diagram is shown in fig. 4 (b), and the specific process is as follows: firstly, the current of a main circuit is sampled by a current sensori g And the sampling signal is transmitted to the control unit, the control unit judges whether the current signal is kept in the fluctuation range of off-state leakage current (less than 100 muA), and when the detected current exceeds a stability margin, a turn-off control signal is generated to control the SF6 circuit breaker to be turned off reliably, so that the thyristor is prevented from being damaged.
When an operation fault or a switching fault occurs in the SF6 circuit breaker, the protection of the circuit breaker is realized through a thyristor, and a control block diagram of the circuit breaker is shown in fig. 4 (b), and the specific process is as follows: the method comprises the steps of firstly detecting the running state of the SF6 circuit breaker, transmitting the running state to a control unit, judging whether the SF6 circuit breaker runs normally or not by the control unit according to state information, and when the SF6 circuit breaker is judged to have a fault, sending a gate pole control signal by the control unit to trigger a thyristor to be rapidly turned off and protect the SF6 circuit breaker.
The invention adopts the combination of the compound switches to realize the on-off switching of the circuit, and can realize the mutual protection of the two switches by controlling the coordination of the SF6 circuit breaker and the thyristor switch. When the thyristor operates in an on-state and an off-state, the protection control is realized by detecting the current of the main circuit and the working state information of the SF6 circuit breaker. When the thyristor operation fault or the leakage current is detected to be overlarge, controlling an SF6 circuit breaker to turn off a protection thyristor; and when the SF6 circuit breaker is detected to work abnormally, triggering the thyristor to turn off the protection circuit breaker. Fig. 3 (a) and 3 (b) show protection control block diagrams of the entire circuit.
The auxiliary control circuit adopts a simple control mode, firstly, the current of the capacitor branch circuit is detected through the sensor unit, when the current change is detected to stop, the control unit triggers the auxiliary circuit relay to be closed, the discharge loop is conducted, and the auxiliary circuit promotes the thyristor to be quickly conducted; when the capacitor discharge stop is detected, the control unit generates a turn-off signal to control the relay to be turned off, the discharge loop is turned off, and the auxiliary circuit waits to enter a capacitor charging state.
Claims (10)
1. A thyristor fast switch and protection control circuit comprises an SF6 circuit breaker and a primary side coupling coil L 1 Secondary side coupling coil L 2 、L 3 And a charge-discharge capacitor C 1 、C 2 (ii) a The method is characterized in that:
coupling coil L 1 The end of the same name is connected with an SF6 circuit breaker and a coupling coil L 1 The different name end side is connected with a thyristor switching module;
coupling coil L 2 、L 3 In a series configuration, a coupling coil L 2 Different name terminal and coupling coil L 3 The ends with the same name are connected with each other, and a coupling coil L 2 、L 3 Common terminal and diode D 1 Positive electrode phaseConnecting and coupling coil L 3 Different name terminal and diode D 2 The positive electrodes are connected;
charging and discharging capacitor C 1 、C 2 Serially connected, charging and discharging capacitor C 1 One end is connected with a coupling coil L 2 End of same name, charging and discharging capacitor C 2 One end is connected with a diode D 2 Negative electrode, charge-discharge capacitor C 1 、C 2 The common terminal is respectively connected with a diode D 1 Negative pole, load reactance X L One end;
coupling coil L 2 And a charging and discharging capacitor C 1 The common end of the relay KM is connected with one end of a relay KM1,
diode D 2 Negative electrode and charge-discharge capacitor C 2 The public end is connected with one end of the relay KM 2;
the other end of the relay KM1 and a load reactance X L The other end of the relay KM2 is connected with a terminal A, a terminal B and a terminal C respectively;
the circuit also comprises a sensor unit which is respectively arranged on the main circuit and the auxiliary control circuit and sends out a corresponding control instruction by detecting the change of current;
the SF6 circuit breaker, the sensor unit, the thyristor switching module, the relays KM1 and KM2 are all connected with the control unit.
2. The thyristor fast switching and protection control circuit of claim 1, wherein: the terminal A is a coupling coil L 1 The terminal B is a common connection point between the two groups of thyristor modules, and the terminal C is a common connection point between the tail end of the thyristor switching module and power equipment.
3. The thyristor fast switch and protection control circuit of claim 1, wherein: the thyristor module is of an anti-parallel structure of two thyristors, and a plurality of groups of thyristor modules form the whole thyristor switching module.
4. The thyristor fast switch and protection control circuit as claimed in claim 1, whereinCharacterized in that: the charge and discharge capacitor C 1 The relay KM1, the first thyristor module ((1)), and the load reactance X L And forming a first auxiliary control loop.
5. The thyristor fast switching and protection control circuit of claim 1, wherein: the charge and discharge capacitor C 2 Load reactance X L The second thyristor module ((2)) and the relay KM2 form an auxiliary control loop II.
6. The thyristor fast switching and protection control circuit of claim 1, wherein: and the SF6 circuit breaker is used for controlling the on-off of the main circuit and triggering the switching of the SF6 circuit breaker through a manual remote signal or a sensor unit signal.
7. A control method for a thyristor fast switch and a protection control circuit is characterized in that: the circuits thereof respectively work in: under four operation modes of a switching-on process, a thyristor on-state, a switching-off process and a thyristor off-state, the working mode of the circuit is determined by the current state of the main circuit, when the thyristor switching module is used for switching, the current of the main circuit can be changed, and the auxiliary control loop works to promote the rapid switching of the thyristor; when the thyristor operates in an on-state and an off-state, the change state of the current is detected by the sensor unit, and whether the switching of the circuit breaker or the thyristor switching module is controlled or not is judged, so that the coordination and the coordination of the two switches are realized.
8. A control method for a thyristor fast switch and a protection control circuit is characterized in that: the combination of the compound switches is adopted to realize the on-off switching of the circuit, and the coordination of the SF6 circuit breaker and the thyristor switch is controlled to realize the mutual protection of the two switches; when the thyristor operates in an on-state and an off-state, the protection control is realized by detecting the current of a main circuit and the working state information of the SF6 circuit breaker; when the thyristor operation fault or the leakage current is detected to be overlarge, controlling an SF6 circuit breaker to turn off a protection thyristor; and when the SF6 circuit breaker is detected to work abnormally, the thyristor is triggered to turn off the SF6 circuit breaker for protection.
9. A control method for a thyristor fast switch and a protection control circuit is characterized in that: the auxiliary control circuit adopts a simple control mode, firstly, the current of the capacitor branch circuit is detected through the sensor unit, when the current change is detected to stop, the control unit triggers the auxiliary circuit relay to be closed, the discharge loop is conducted, and the auxiliary circuit promotes the thyristor to be quickly conducted; when the capacitor discharge stop is detected, the control unit generates a turn-off signal to control the relay to be turned off, the discharge loop is turned off, and the auxiliary circuit waits for entering a capacitor charging state.
10. A control method for a thyristor fast switch and a protection control circuit is characterized in that: the coordinated protection control among the switches is realized by judging the working states of the thyristors and the SF6 circuit breaker:
when the thyristor unit has a voltage-sharing problem or the off-state leakage current of the thyristor is too large, the control unit controls the SF6 circuit breaker to be switched off; when the SF6 circuit breaker has an operation problem or the cut-off electric arc is too large, the control unit triggers the thyristor to be turned off, and mutual protection of the two switches is realized through the coordination of the switches;
when the thyristor works in an on-state running state, the specific process is as follows: firstly, the current of a main circuit is sampled by a current sensori g The sampling signal is transmitted to the control unit, the control unit judges whether the current signal is kept in an on-state current fluctuation range, and when the detected current exceeds a stability margin, a turn-off control signal is generated to control the circuit breaker to be turned off reliably, so that the damage of a thyristor is avoided;
when the thyristor works in an off-state running state, the specific process is as follows: firstly, the current of a main circuit is sampled by a current sensori g And transmitting the sampling signal to a control unit, judging whether the current signal is kept in an off-state leakage current fluctuation range, namely less than 100 muA, generating a turn-off control signal when the detected current exceeds a stability margin, and controlling an SF6 circuit breaker to be reliably turned off to avoid damage of a thyristor;
when the circuit breaker has operation fault or switching fault, the circuit breaker is protected through the thyristor, and the specific process is as follows: the method comprises the steps of firstly detecting the running state of the SF6 circuit breaker, transmitting the running state to a control unit, judging whether the SF6 circuit breaker runs normally or not by the control unit according to state information, and when the SF6 circuit breaker is judged to have a fault, sending a gate pole control signal by the control unit to trigger a thyristor to be rapidly turned off and protect the SF6 circuit breaker.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015154537A1 (en) * | 2014-04-08 | 2015-10-15 | 国家电网公司 | Passive high-voltage direct-current circuit breaker and implementation method therefor |
| CN206442105U (en) * | 2016-12-16 | 2017-08-25 | 国家电网公司 | Current transformer monitoring and protecting system |
| CN107342754A (en) * | 2017-06-28 | 2017-11-10 | 上海交通大学 | Dc circuit breaker and its control method based on coupled inductor |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015154537A1 (en) * | 2014-04-08 | 2015-10-15 | 国家电网公司 | Passive high-voltage direct-current circuit breaker and implementation method therefor |
| CN206442105U (en) * | 2016-12-16 | 2017-08-25 | 国家电网公司 | Current transformer monitoring and protecting system |
| CN107342754A (en) * | 2017-06-28 | 2017-11-10 | 上海交通大学 | Dc circuit breaker and its control method based on coupled inductor |
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