CN211089117U - Solid-state AC circuit breaker based on thyristor - Google Patents
Solid-state AC circuit breaker based on thyristor Download PDFInfo
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- CN211089117U CN211089117U CN201921039600.3U CN201921039600U CN211089117U CN 211089117 U CN211089117 U CN 211089117U CN 201921039600 U CN201921039600 U CN 201921039600U CN 211089117 U CN211089117 U CN 211089117U
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Abstract
The utility model discloses a solid-state AC circuit breaker based on thyristor relates to circuit breaker technical field. The solid-state alternating current circuit breaker is mainly divided into a current-carrying path, a current transfer path and an energy absorption circuit, wherein the current-carrying path is electrically connected with the energy absorption circuit, a current transfer branch and a controller respectively; the controller is electrically connected with the current transfer branch. The power electronic device thyristor and the diode rectification topology are connected in parallel to serve as a current carrying path, and the current transfer path is composed of a diode rectification bridge, an absorption capacitor, a discharge resistor, a high-frequency transformer and an inverter. The overvoltage absorption circuit is composed of an overvoltage absorption lightning arrester. The utility model discloses can realize the quick break-make to alternating current circuit, breaking capacity is strong, and with low costs, and control is nimble relatively. The utility model discloses operating procedure is simple, and easy control proves its very reliable and stable through long-term practice inspection.
Description
Technical Field
The utility model relates to a circuit breaker technical field, in particular to solid-state AC circuit breaker based on thyristor.
Background
The circuit breaker may be classified into an ac circuit breaker and a dc circuit breaker according to the nature of a breaking power supply, a solid-state circuit breaker depending on power electronic devices such as IGBTs, a conventional mechanical circuit breaker, and a hybrid circuit breaker in which a mechanical switch is combined with a power electronic device according to a breaking principle.
The traditional mechanical circuit breaker has high compressive strength, good reliability and low on-state loss, but can generate electric arc in the process of breaking a current path, so that the breaking contact is abraded, the maintenance is not facilitated, and the breaking speed is low. Therefore, solid-state circuit breakers based on power electronics are becoming a new trend of research.
At present, the breaking capacity of a solid-state alternating-current circuit breaker based on a thyristor is weak, and the control is relatively complex.
SUMMERY OF THE UTILITY MODEL
One of the objects of the utility model is to provide a solid-state ac circuit breaker based on thyristor carries out quick break-make to the alternating current circuit, and the breaking capacity is strong, and is with low costs, and control is nimble relatively. In order to achieve the above object, the utility model provides a following scheme:
a solid-state alternating current circuit breaker based on a thyristor comprises a current carrying path, an energy absorption circuit, a current transfer branch and a controller;
the current-carrying path is electrically connected with the energy absorption circuit, the current transfer branch and the controller respectively; the controller is electrically connected with the current transfer branch circuit;
the current-carrying path is used for providing a current path between an alternating current power supply and electric equipment and can be controlled by a controller to be switched on and switched off;
the energy absorption circuit is used for absorbing overvoltage generated in the switching-on or switching-off process of the semiconductor power device and is connected with the semiconductor power device in the current-carrying path in parallel;
the current transfer branch circuit is used for giving necessary reverse voltage to the current transfer branch circuit when the current carrying path needs to be subjected to breaking operation, so that current does not flow through the current carrying path any more to achieve the purpose of the current carrying path; the current transfer branch is also connected in parallel with the semiconductor power device in the current carrying path;
the controller is used for controlling the current transfer branch circuit to generate reverse voltage and the breaking and recovery operation of the current-carrying path, and the generated driving signal acts on the current-carrying path and the current transfer branch circuit.
Preferably, the current-carrying path comprises a rectifier bridge formed by diodes and a thyristor which are connected in parallel, the alternating current power supply supplies power to the load through a current path formed by the diode rectifier bridge and the thyristor which are connected in parallel, and the controller provides a control signal for the thyristor.
Preferably, the energy absorption circuit is constituted by an overvoltage absorption arrester MOV connected in parallel with the current carrying path for absorbing overvoltages occurring when the thyristor is switched on and off.
Preferably, the current transfer branch comprises an absorption capacitor C, a discharge resistor R, a diode rectifier bridge, a transformer Tr and an inverter;
the discharge resistor R is connected with the absorption capacitor C in series, a diode forms a rectifier bridge which is connected on the discharge resistor R in parallel, two middle points of the rectifier bridge are respectively connected with two primary taps of a transformer Tr, and the secondary output of the transformer Tr is connected with the inverter; the inverter is powered by a battery or a capacitor.
The utility model provides a main advantage of solid-state AC circuit breaker based on thyristor embodies in following several aspects:
1. compared with the traditional mechanical alternating current-direct current circuit breaker, the solid-state circuit breaker based on the power electronic device and the hybrid circuit breaker based on the combination of the power electronic device and the mechanical switch have outstanding advantages in the aspects of action time, arc suppression, maintenance cost and the like.
2. The current-carrying path in the first part selects the combination of the diode rectifier bridge and the thyristor, compared with a full-control device IGBT, the thyristor is more deeply researched, the voltage-resisting effect is better, and the cost is lower. Meanwhile, according to different voltage class application occasions, a plurality of thyristors can be selected to be connected in series to improve the whole voltage-resistant effect, so that the high-voltage thyristor is also suitable for a high-voltage environment. Because the thyristor series technology is relatively mature, the solid-state alternating current circuit breaker is more flexible in application and lower in cost.
3. In the current transfer branch circuit, a high-frequency inverter is combined with a high-frequency transformer, and a proper reverse voltage is given to a thyristor when the action of a breaker is needed through a diode rectifier bridge, so that the control is more convenient. Meanwhile, the capacity of the solid-state circuit breaker for cutting off current and recovering a current path is optimized by setting a reasonable transformer transformation ratio, and the breaking speed is ideal. Compare in other solid-state circuit breakers that adopt the IGBT as control core, the circuit breaker still possesses the area little, and the technical difficulty is low grade advantage.
The utility model provides a solid-state AC circuit breaker control method based on thyristor operating sequence is simple, easy control, and it is very reliable and stable through long-term practice inspection proof.
Drawings
Fig. 1 is a structural diagram of a thyristor-based solid-state ac circuit breaker system according to the present invention;
fig. 2 is the present invention provides a thyristor-based solid-state ac circuit breaker topology.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described clearly and completely with reference to fig. 1 to 2 of the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
As shown in fig. 1, a solid-state ac thyristor-based circuit breaker includes a current-carrying path 1, an energy absorption circuit 2, a current transfer branch 3, and a controller 4.
The current-carrying path 1 is electrically connected with the energy absorption circuit 2, the current transfer branch 3 and the controller 4 respectively; the controller 4 is electrically connected to the current transfer branch 3.
The current carrying path 1 is used for providing a current path between an alternating current power supply source and a power consumer, and can be controlled to be switched on and off by the controller 4.
The energy absorption circuit 2 is used to absorb an overvoltage generated during the turn-on or turn-off of the semiconductor power device, and is connected in parallel with the semiconductor power device in the current carrying path 1.
The current transfer branch 3 is used for giving necessary reverse voltage to the current transfer branch when the current carrying path 1 needs to be subjected to breaking operation, so that current does not flow through the current carrying path 1 any more, and the purpose of the current carrying path 1 is achieved. The current transfer branch 3 is also connected in parallel with the semiconductor power device in said current carrying path 1.
The controller 4 is used for controlling the current transfer branch 3 to generate reverse voltage and the breaking and recovery operations of the current carrying path 1, and the generated driving signal acts on the current carrying path 1 and the current transfer branch 3.
Specifically, as shown in fig. 2, the current carrying path 1 is formed by connecting a thyristor and a diode rectifier topology in parallel in the power electronic device, that is, an ac power supply supplies power to a load through a current path in which a diode rectifier bridge is connected in parallel with the thyristor. The controller 4 provides control signals for the thyristor, when the thyristor is provided with a turn-on signal, the alternating voltage can be continuously supplied to the load, when the two ends of the thyristor bear certain reverse voltage, the thyristor can be turned off, and the alternating voltage can not continuously supply power to the load. Therefore, the thyristor plays a role in controlling the on-off of the solid-state alternating current circuit breaker.
The energy absorption circuit 2 is formed by an overvoltage absorption arrester MOV, which is connected in parallel with the current carrying path 1 and mainly functions to absorb overvoltage occurring when the thyristor is turned on and off.
The current transfer branch 3 is composed of an absorption capacitor C, a discharge resistor R, high-frequency diodes D5 to D8, a high-frequency transformer Tr, and a high-frequency inverter.
The current transfer branch 3 is also connected in parallel with the current carrying path 1 and the energy absorption circuit 2. In the current transfer branch 3, a discharge resistor R is connected in series with an absorption capacitor C, high-frequency diodes D5-D8 form a rectifier bridge which is connected in parallel with the discharge resistor R, two middle points of the rectifier bridge are respectively connected with two primary taps of a high-frequency transformer Tr, and the secondary output of the high-frequency transformer Tr is connected with a high-frequency inverter. The high frequency inverter is powered by a battery or capacitor.
When a short-circuit fault occurs in an alternating current power supply system or when a certain device needs to be overhauled, a power supply current-carrying path needs to be cut off, at this time, a driving signal of a high-frequency inverter is triggered through the controller 4, a fixed high-frequency alternating current voltage is output, a cut-off voltage opposite to the conduction direction of a thyristor is output through the diode rectifier bridge, and the effects of cutting off the thyristor and cutting off a current path are achieved. After the circuit is disconnected, the alternating current path does not flow through the thyristor any more, but flows through the discharge resistor and the absorption capacitor along one current direction through the diode rectifier bridge, at this time, the alternating current output voltage can be rectified, the absorption capacitor is charged at the same time, and on the other hand, the alternating current voltage output by the high-frequency transformer also charges the capacitor through the diode rectifier bridge. When the modulation of the driving signal of the inverter is stopped, only the alternating current power supply of the power supply source charges the capacitor at the moment. When the fault repair is finished and the current-carrying path needs to be conducted again to recover power supply, the thyristor is triggered again to be conducted, and at the moment, the voltage on the capacitor can complete discharging through the current-carrying path. Waiting for the next time the circuit needs to be opened.
The thyristor of the current-carrying path 1 is connected in parallel with the overvoltage absorption arrester MOV in the second part, the absorption capacitor and the discharge resistor in the current transfer branch of the third part are connected in series and then connected in parallel with the overvoltage absorption arrester MOV in the second part, the diode rectifier bridge is connected in parallel with the discharge resistor, the input end of the diode rectifier bridge is the secondary side of the high-frequency transformer Tr, and the primary side of the diode rectifier bridge is connected to the high-frequency inverter.
The control of the thyristor-based solid-state ac circuit breaker may employ the following method steps, including:
step 101: when a short-circuit fault occurs in an alternating current power supply system or certain equipment needs to be overhauled, giving a trigger instruction to a controller;
step 102: the controller outputs a driving signal of the high-frequency inverter and outputs a fixed high-frequency alternating voltage;
step 103: the diode rectifier bridge outputs cut-off voltage opposite to the conduction direction of the thyristor, the thyristor is turned off, the current path is cut off, the alternating current path does not flow through the thyristor any more, but flows through the discharge resistor and the absorption capacitor along one current direction through the diode rectifier bridge, and the absorption capacitor is charged;
step 104: the alternating voltage output by the high-frequency transformer charges the absorption capacitor through the diode rectifier bridge;
step 105: stopping the modulation of the driving signal of the inverter through the controller, and only charging the absorption capacitor by the alternating current power supply of the power supply at the moment;
step 106: when the current-carrying path needs to be conducted again to recover power supply, the thyristor is triggered again through the controller to be conducted, at the moment, the voltage on the absorption capacitor can complete discharging through the current-carrying path, and then the moment when the circuit needs to be disconnected next time is waited.
The utility model provides a main advantage of solid-state AC circuit breaker based on thyristor embodies in following several aspects:
1. compared with the traditional mechanical alternating current-direct current circuit breaker, the solid-state circuit breaker based on the power electronic device and the hybrid circuit breaker based on the combination of the power electronic device and the mechanical switch have outstanding advantages in the aspects of action time, arc suppression, maintenance cost and the like.
2. The current-carrying path in the first part selects the combination of the diode rectifier bridge and the thyristor, compared with a full-control device IGBT, the thyristor is more deeply researched, the voltage-resisting effect is better, and the cost is lower. Meanwhile, according to different voltage class application occasions, a plurality of thyristors can be selected to be connected in series to improve the whole voltage-resistant effect, so that the high-voltage thyristor is also suitable for a high-voltage environment. Because the thyristor series technology is relatively mature, the solid-state alternating current circuit breaker is more flexible in application and lower in cost.
3. In the current transfer branch circuit, a high-frequency inverter is combined with a high-frequency transformer, and a proper reverse voltage is given to a thyristor when the action of a breaker is needed through a diode rectifier bridge, so that the control is more convenient. Meanwhile, the capacity of the solid-state circuit breaker for cutting off current and recovering a current path is optimized by setting a reasonable transformer transformation ratio, and the breaking speed is ideal. Compare in other solid-state circuit breakers that adopt the IGBT as control core, the circuit breaker still possesses the area little, and the technical difficulty is low grade advantage.
The utility model provides a solid-state AC circuit breaker control method based on thyristor operating sequence is simple, easy control, and it is very reliable and stable through long-term practice inspection proof.
Claims (4)
1. A solid-state AC circuit breaker based on thyristors is characterized by comprising a current-carrying path (1), an energy absorption circuit (2), a current transfer branch (3) and a controller (4);
the current-carrying path (1) is electrically connected with the energy absorption circuit (2), the current transfer branch (3) and the controller (4) respectively; the controller (4) is electrically connected with the current transfer branch (3);
the current-carrying path (1) is used for providing a current path between an alternating current power supply and electric equipment and can be controlled to be on and off through a controller (4);
the energy absorption circuit (2) is used for absorbing overvoltage generated in the process of switching on or switching off the semiconductor power device and is connected with the semiconductor power device in the current-carrying path (1) in parallel;
the current transfer branch circuit (3) is used for giving necessary reverse voltage to the current transfer branch circuit when the current carrying path (1) needs to be subjected to breaking operation, so that current does not flow through the current carrying path (1) any more to achieve the purpose of the current carrying path (1); the current transfer branch (3) is also connected in parallel with the semiconductor power device in the current carrying path (1);
the controller (4) is used for controlling the current transfer branch (3) to generate reverse voltage and the breaking and recovery operation of the current-carrying path (1), and the generated driving signal acts on the current-carrying path (1) and the current transfer branch (3).
2. The thyristor-based solid state alternating current circuit breaker of claim 1, wherein:
the current-carrying path (1) comprises a rectifier bridge formed by diodes and a thyristor which are connected in parallel, an alternating current power supply supplies power to a load through a current path formed by the diode rectifier bridge and the thyristor which are connected in parallel, and the controller (4) provides a control signal for the thyristor.
3. The thyristor-based solid state alternating current circuit breaker of claim 2, wherein:
the energy absorption circuit (2) is composed of an overvoltage absorption arrester MOV which is connected with the current carrying path (1) in parallel and is used for absorbing overvoltage generated when the thyristor is switched on and switched off.
4. The thyristor-based solid state alternating current circuit breaker of claim 2, wherein:
the current transfer branch circuit (3) comprises an absorption capacitor C, a discharge resistor R, diodes (D5-D8) rectifier bridges, a transformer Tr and an inverter;
the discharge resistor R is connected with the absorption capacitor C in series, diodes (D5-D8) form a rectifier bridge which is connected on the discharge resistor R in parallel, two middle points of the rectifier bridge are respectively connected with two primary taps of a transformer Tr, and the secondary output of the transformer Tr is connected with the inverter; the inverter is powered by a battery or a capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921039600.3U CN211089117U (en) | 2019-07-05 | 2019-07-05 | Solid-state AC circuit breaker based on thyristor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921039600.3U CN211089117U (en) | 2019-07-05 | 2019-07-05 | Solid-state AC circuit breaker based on thyristor |
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| CN211089117U true CN211089117U (en) | 2020-07-24 |
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| CN201921039600.3U Active CN211089117U (en) | 2019-07-05 | 2019-07-05 | Solid-state AC circuit breaker based on thyristor |
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