CN112234624A - Method for quickly switching main bypass of active voltage quality controller - Google Patents
Method for quickly switching main bypass of active voltage quality controller Download PDFInfo
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- CN112234624A CN112234624A CN202011056049.0A CN202011056049A CN112234624A CN 112234624 A CN112234624 A CN 112234624A CN 202011056049 A CN202011056049 A CN 202011056049A CN 112234624 A CN112234624 A CN 112234624A
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- thyristor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
Abstract
The invention discloses a method for quickly switching a main bypass of an active voltage quality controller, which comprises a main path unit, a bypass unit, an alternating current power grid, a load and a detection circuit, wherein the main path unit comprises a parallel rectification unit, a bus capacitor unit and a series inversion unit, the bypass unit is formed by connecting a contactor and a thyristor in parallel, the bypass unit is connected between the alternating current power grid and the load through the middle point of the connection between the two ends of the contactor and the thyristor, the thyristor is formed by connecting two thyristors in inverse parallel, and the active voltage quality controller has two working modes, namely a bypass standby mode and a main path compensation mode. The method realizes that the device can provide stable power supply for a post-stage user in the main circuit and bypass switching process by using the reversely parallel thyristors as bridging in the main circuit and bypass switching process, realizes uninterrupted switching, and can directly and naturally dissipate heat without an additional radiator because the reversely parallel thyristors are short in conduction time in the switching process.
Description
Technical Field
The invention relates to the field of power quality management, in particular to a method for quickly switching a main bypass of an active voltage quality controller.
Background
The development of a power distribution network in a remote area is relatively lagged, a grid structure is generally presented, the power supply radius is large, residents live in the power distribution network and mainly use electricity for life of the residents, and electricity loads are scattered on a power distribution line, so that large voltage drop is generated on the power distribution line, and the problem of low voltage is generated at the middle and rear sections of the power distribution network, especially during the peak period of power utilization. If the traditional transformation mode is adopted, great transformation cost is generated, and new power grid problems can be caused. On the basis, the method is realized by considering a mode of simple implementation operation, good economic benefit and low later maintenance cost.
The power quality problems of voltage drop, overvoltage, undervoltage and harmonic waves are solved. A novel single-phase series voltage quality controller based on power electronics is adopted. The device consists of a main circuit and a bypass, automatically detects the voltage of a power grid, switches from bypass power supply to the main circuit to be put into operation for compensation when detecting that the voltage of the power grid exceeds the set upper limit and the lower limit of automatic compensation, and switches between the main circuit and the bypass are possible to occur at any time due to the fact that the voltage quality problem occurs at any time. Therefore, in order to ensure the reliability of the power supply of the subsequent stage user, the reliability of the bypass portion needs to be enhanced.
The bypass part of the prior technical scheme consists of a single contactor, and when the voltage is recovered to be normal or the active voltage quality adjusting device breaks down, the bypass part is automatically switched to send a contactor pull-in signal, the contactor pulls in, and power is continuously supplied to a back-stage user. When the fault is recovered and the voltage of the power grid is detected to be abnormal, the controller sends out a contactor cut-off signal, the contactor is disconnected, and the main circuit operates to perform voltage compensation.
How to ensure that the rear-stage load is not powered down during the main bypass switching is a matter that those skilled in the art are dedicated to solve.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for quickly switching a main bypass of an active voltage quality controller.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for fast switching a main bypass of an active voltage quality controller comprises a main circuit unit, a bypass unit, an alternating current power grid, a load and a detection circuit, wherein the main circuit unit comprises a parallel rectification unit, a bus capacitor unit and a series inversion unit, the bypass unit is formed by connecting a contactor and a thyristor in parallel, the bypass unit is connected between the alternating current power grid and the load through the middle point of the connection of the two ends of the contactor and the thyristor, the thyristor is formed by connecting two thyristors in parallel in reverse direction, the active voltage quality controller has two working modes which are respectively a bypass standby mode and a main circuit compensation mode, and when the voltage of the power grid is normal, the contactor in the bypass unit is continuously attracted to supply power to the load; when the abnormal voltage of the power grid is detected, the parallel rectification unit in the main circuit unit operates, the bypass thyristor is put into use, the contactor is cut off, then the corresponding IGBT switch tube in the main circuit unit is switched on, back pressure is generated at two ends of the thyristor, the thyristor is forced to be switched off, and the main circuit compensation mode is entered.
Preferably, the specific process of switching the bypass standby mode to the main compensation mode is as follows:
A1) the detection circuit detects whether the voltage of the power grid is normal, if so, the bypass unit continues to operate; if not, go to step A2);
A2) judging whether the voltage of the power grid exceeds the overvoltage and undervoltage range, if so, entering the step A3); if not, returning to the step A1);
A3) the parallel connection rectification unit in the main circuit unit enters voltage stabilization, the controller sends an instruction to the thyristor and the contactor to require the thyristor to be put into operation, and the contactor is cut off;
A4) confirming whether the thyristor is put into, if not, returning to the step A3); if yes, continuously confirming whether the contactor is cut off, if yes, entering the step A5), and if not, returning to the step A3);
A5) the controller sends a command to the thyristor to request the thyristor to be cut off, if the thyristor confirms to be cut off, the step A6 is carried out); if the thyristor is not cut off, continuing to send a cutting-off instruction to the thyristor;
A6) and the main circuit unit is connected with the inversion unit in series to work so as to carry out a main circuit compensation mode.
As a specific implementation manner, in step a 5), when the thyristor is turned on and the contactor is cut off, the controller turns on the corresponding IGBT switch tube in the main circuit unit according to the voltage direction of the power grid, so as to generate a back voltage across the thyristor and force the thyristor to turn off rapidly.
Preferably, the specific process of switching the main compensation mode to the bypass standby mode is as follows:
B1) judging whether the power grid voltage is normal or exceeds an over-voltage and under-voltage range, if so, entering a step B2); if the voltage of the power grid is abnormal or exceeds the over-voltage and under-voltage range, continuing the main circuit compensation mode;
B2) the main circuit unit is connected with the inverter unit in series to seal pulses, and the controller sends out an instruction to request the thyristor and the contactor to be switched in;
B3) confirming whether the thyristor is put into, if not, returning to the step B2); if yes, whether the contactor is put into operation is confirmed, if no, the step B2) is returned, and if yes, the step B4) is entered;
B4) the controller sends out an instruction, the main path unit stops running and requires the thyristor to be cut off, and if the thyristor is confirmed to be cut off, the step B5 is carried out); if the thyristor is not cut off, the controller signals to force the thyristor to cut off;
B5) and the bypass unit is put into operation and enters a bypass standby mode.
Preferably, in step B4), after the main circuit unit stops operating, the contactor is switched on, the contactor is closed, and the thyristor is automatically turned off.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the method for rapidly switching the main bypass of the active voltage quality controller realizes that the device can provide stable power supply for a post-stage user in the switching process of the main path and the bypass by using the reversely parallel thyristors as bridging in the switching process of the main path and the bypass, realizes uninterrupted switching, and can directly and naturally dissipate heat without an additional radiator because the reversely parallel thyristors are short in conduction time in the switching process.
Drawings
FIG. 1 is a circuit topology diagram of an active voltage quality controller;
FIG. 2 is a timing diagram of the process of switching from the bypass standby mode to the main path compensation mode;
fig. 3 is a timing diagram illustrating the process of switching the main compensation mode to the bypass standby mode.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the specific embodiments.
A method for fast switching of a main bypass of an active voltage quality controller comprises a main path unit, a bypass unit, an alternating current power grid, a load and a detection circuit, and is shown in figure 1. The main circuit unit comprises a parallel connection rectification unit, a bus capacitance unit and a series connection inversion unit, wherein the bypass unit is formed by connecting a contactor and a thyristor in parallel, the bypass unit is connected between an alternating current power grid and a load through the middle point of the two ends of the contactor, which is connected with the thyristor, the thyristor is formed by two thyristors which are connected in parallel in a reverse direction, and the active voltage quality controller has two working modes, namely a bypass standby mode and a main circuit compensation mode. When the voltage of the power grid is normal, the contactor in the bypass unit is continuously attracted to supply power to the load; when the voltage of the power grid is detected to be abnormal, namely high voltage or low voltage occurs, the parallel rectification unit in the main circuit unit operates, the bypass thyristor is switched on, the contactor is cut off, then the corresponding IGBT switching tube in the main circuit unit is switched on, back voltage is generated at two ends of the thyristor, and the thyristor is forced to be switched off, so that the main circuit compensation mode is entered.
Referring to fig. 2, the main circuit commissioning process, that is, the specific process of switching the bypass standby mode to the main circuit compensation mode, is as follows:
A1) the detection circuit detects whether the voltage of the power grid is normal, if so, the bypass unit continues to operate, namely the bypass unit operates, and the main circuit module is cut off; if not, go to step A2);
A2) judging whether the voltage of the power grid exceeds the overvoltage and undervoltage range, if so, entering the step A3); if not, returning to the step A1);
A3) entering a main circuit module switching process, enabling a parallel rectification unit in the main circuit unit to enter voltage stabilization, sending an instruction to a thyristor and a contactor by a controller, requiring the thyristor to be switched in, and switching off the contactor;
A4) confirming whether the thyristor is put into, if not, returning to the step A3); if yes, continuing to confirm whether the contactor is cut off, if yes, entering step A5), if not, returning to step A3), wherein the thyristor throw-in time is less than 10ms, and the contactor cut-off time is within 100 ms;
A5) the controller sends a command to the thyristor to request the thyristor to be cut off, if the thyristor confirms to be cut off, the step A6 is carried out); if the thyristor is not cut off, continuing to send a cutting-off instruction to the thyristor;
A6) after the thyristor is switched off, the series inversion unit in the main circuit unit is put into operation to carry out the main circuit compensation mode.
Here, in step a 5), when the thyristor is turned on and the contactor is cut off, the controller turns on the corresponding IGBT switch tube in the main circuit unit according to the forward and reverse of the grid voltage, so as to generate a back voltage across the thyristor and force the thyristor to turn off rapidly.
Referring to fig. 3, the bypass operation process, that is, the specific process of switching the main compensation mode to the bypass standby mode, is as follows:
B1) judging whether the power grid voltage is normal or exceeds an over-voltage and under-voltage range, if so, entering a step B2); if the voltage of the power grid is abnormal or exceeds the over-voltage and under-voltage range, continuing the main circuit compensation mode;
B2) the main circuit unit is connected with the inverter unit in series to seal pulses, and the controller sends out an instruction to request the thyristor and the contactor to be switched in;
B3) confirming whether the thyristor is put into, if not, returning to the step B2); if yes, whether the contactor is put into the device is confirmed, if no, the step B2 is returned, if yes, the step B4) is carried out, wherein the time for putting the thyristor into the device is within 10ms, and the time for putting the contactor into the device is within 100 ms;
B4) the controller sends out an instruction, the main road module is cut off, the main road unit stops running, the thyristor is required to be cut off, and if the thyristor is confirmed to be cut off, the step B5 is carried out); if the thyristor is not cut off, the controller signals to force the thyristor to cut off;
B5) and the bypass unit is put into operation and enters a bypass standby mode.
And step B4), after the main circuit unit stops running, the contactor is put into operation, the contactor is closed, and the thyristor is automatically turned off.
In the method for rapidly switching the main bypass of the active voltage quality controller, the thyristor only plays a role of bridging in the switching process of the main bypass, the working time is extremely short and is within 10ms, so that a radiator does not need to be arranged at the thyristor; in addition, the invention mainly carries out switching work between the contactor and the main circuit in the main bypass switching process, belongs to steady state compensation and cannot influence the electricity consumption of a post-stage user.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (5)
1. A method for fast switching a main bypass of an active voltage quality controller is characterized in that the active voltage quality controller comprises a main circuit unit, a bypass unit, an alternating current power grid, a load and a detection circuit, wherein the main circuit unit comprises a parallel rectification unit, a bus capacitor unit and a series inversion unit, the bypass unit is formed by connecting a contactor and a thyristor in parallel, the bypass unit is connected between the alternating current power grid and the load through the middle point of the connection between the two ends of the contactor and the thyristor, the thyristor is formed by connecting two thyristors in parallel in a reverse direction, the active voltage quality controller has two working modes which are a bypass standby mode and a main circuit compensation mode respectively, and when the voltage of the power grid is normal, the contactor in the bypass unit is continuously attracted to supply power to the load; when the abnormal voltage of the power grid is detected, the parallel rectification unit in the main circuit unit operates, the bypass thyristor is put into use, the contactor is cut off, then the corresponding IGBT switch tube in the main circuit unit is switched on, back pressure is generated at two ends of the thyristor, the thyristor is forced to be switched off, and the main circuit compensation mode is entered.
2. The method for fast switching of the main bypass of the active voltage quality controller according to claim 1, wherein the specific process of switching the bypass standby mode to the main path compensation mode is as follows:
A1) the detection circuit detects whether the voltage of the power grid is normal, if so, the bypass unit continues to operate; if not, go to step A2);
A2) judging whether the voltage of the power grid exceeds the overvoltage and undervoltage range, if so, entering the step A3); if not, returning to the step A1);
A3) the parallel connection rectification unit in the main circuit unit enters voltage stabilization, the controller sends an instruction to the thyristor and the contactor to require the thyristor to be put into operation, and the contactor is cut off;
A4) confirming whether the thyristor is put into, if not, returning to the step A3); if yes, continuously confirming whether the contactor is cut off, if yes, entering the step A5), and if not, returning to the step A3);
A5) the controller sends a command to the thyristor to request the thyristor to be cut off, if the thyristor confirms to be cut off, the step A6 is carried out); if the thyristor is not cut off, continuing to send a cutting-off instruction to the thyristor;
A6) and the main circuit unit is connected with the inversion unit in series to work so as to carry out a main circuit compensation mode.
3. The method for fast switching the main bypass of the active voltage quality controller according to claim 2, wherein in the step A5), when the thyristor is switched on and the contactor is cut off, the controller turns on the corresponding IGBT switch tube in the main unit according to the voltage direction of the power grid, so as to generate a back voltage across the thyristor and force the thyristor to be turned off fast.
4. The method of claim 1, wherein the specific process of switching the main compensation mode to the bypass standby mode is as follows:
B1) judging whether the power grid voltage is normal or exceeds an over-voltage and under-voltage range, if so, entering a step B2); if the voltage of the power grid is abnormal or exceeds the over-voltage and under-voltage range, continuing the main circuit compensation mode;
B2) the controller sends a pulse signal to the series inversion unit in the main circuit unit and sends an instruction to request the thyristor and the contactor to be switched in;
B3) confirming whether the thyristor is put into, if not, returning to the step B2); if yes, whether the contactor is put into operation is confirmed, if no, the step B2) is returned, and if yes, the step B4) is entered;
B4) the controller sends out an instruction, the main path unit stops running and requires the thyristor to be cut off, and if the thyristor is confirmed to be cut off, the step B5 is carried out); if the thyristor is not cut off, the controller signals to force the thyristor to cut off;
B5) and the bypass unit is put into operation and enters a bypass standby mode.
5. The method for fast switching the main bypass of the active voltage quality controller according to claim 4, wherein in the step B4), after the main unit stops operating, the contactor is put into operation, the contactor is closed, and the thyristor is automatically turned off.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011056049.0A CN112234624A (en) | 2020-09-30 | 2020-09-30 | Method for quickly switching main bypass of active voltage quality controller |
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| CN202011056049.0A CN112234624A (en) | 2020-09-30 | 2020-09-30 | Method for quickly switching main bypass of active voltage quality controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113103929A (en) * | 2021-03-23 | 2021-07-13 | 北京交通大学 | Composite switch structure applied to railway ground automatic passing neutral section system |
| CN117477754A (en) * | 2023-12-28 | 2024-01-30 | 武汉中楚柏泰智能科技有限公司 | Working mode switching method and system for electromagnetic type power quality unified controller |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018087603A2 (en) * | 2016-10-28 | 2018-05-17 | Muzychenko Oleksandr | Method of continuous power supply |
| CN108173270A (en) * | 2017-12-16 | 2018-06-15 | 西安翌飞核能装备股份有限公司 | A kind of energy saving power distribution network low-voltage compensating device and method |
| CN110350539A (en) * | 2019-06-25 | 2019-10-18 | 苏州爱科赛博电源技术有限责任公司 | A kind of DVR bypass thyristor quickly cuts off control method |
-
2020
- 2020-09-30 CN CN202011056049.0A patent/CN112234624A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018087603A2 (en) * | 2016-10-28 | 2018-05-17 | Muzychenko Oleksandr | Method of continuous power supply |
| CN108173270A (en) * | 2017-12-16 | 2018-06-15 | 西安翌飞核能装备股份有限公司 | A kind of energy saving power distribution network low-voltage compensating device and method |
| CN110350539A (en) * | 2019-06-25 | 2019-10-18 | 苏州爱科赛博电源技术有限责任公司 | A kind of DVR bypass thyristor quickly cuts off control method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113103929A (en) * | 2021-03-23 | 2021-07-13 | 北京交通大学 | Composite switch structure applied to railway ground automatic passing neutral section system |
| CN117477754A (en) * | 2023-12-28 | 2024-01-30 | 武汉中楚柏泰智能科技有限公司 | Working mode switching method and system for electromagnetic type power quality unified controller |
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Application publication date: 20210115 |