CN216162403U - Fault ride-through circuit of active voltage regulator - Google Patents
Fault ride-through circuit of active voltage regulator Download PDFInfo
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- CN216162403U CN216162403U CN202121839276.0U CN202121839276U CN216162403U CN 216162403 U CN216162403 U CN 216162403U CN 202121839276 U CN202121839276 U CN 202121839276U CN 216162403 U CN216162403 U CN 216162403U
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Abstract
The utility model relates to the technical field of flexible direct current transmission, particularly provides a fault ride-through circuit of an active voltage regulator, and aims to solve the technical problem of fault ride-through of the active voltage regulator. The method comprises the following steps: the fault ride-through circuit comprises: a converter transformer and an active voltage regulator; the positive output end of the inversion side of the active voltage regulator is connected with the lowest end of a first winding of the converter transformer; the positive output end of the inversion side of the active voltage regulator is connected with a second winding of the converter transformer through a quick switching device; the negative output end of the inversion side of the active voltage regulator is grounded; and the rectifying side of the active voltage regulator is connected with two ends of the second winding of the converter transformer through an energy-taking transformer. The scheme designs reasonable alternating current fault ride-through current of the active voltage regulator, can smoothly quit the active voltage regulator without influencing the work of the converter transformer in the period of serious fault of an external alternating current system, and is put into operation again after the fault is ended.
Description
Technical Field
The utility model relates to the field of voltage regulation of a direct current system, in particular to a fault ride-through circuit of an active voltage regulator.
Background
The converter transformer is the core of a high-voltage direct-current transmission system, in order to meet the voltage regulation requirement of the direct-current system, a mechanical on-load voltage regulating switch is arranged in the converter transformer, and the purpose of regulating the voltage of a valve side winding is achieved by regulating the number of turns of a high-voltage side winding of the converter transformer. However, the on-load tap changer is extremely complex in mechanical structure, and in long-term operation, the switch gear needs to be frequently adjusted, so that various mechanical faults are easily caused, and the risk of short circuit between the converter transformer turns exists.
The active voltage regulation technology based on the power electronic technology can regulate the voltage at two ends of a side winding of a converter transformer network by controlling the output voltage of an active voltage regulator, further realize the regulation of the voltage of a side winding of a valve, and the power electronic device has the advantages of flexible control, unlimited action times, high response speed, capability of quickly supporting the voltage when the system voltage drops, capability of resisting the commutation failure of a direct current system, and new development direction of the on-load voltage regulation of the converter transformer. At present, a technical scheme of replacing a traditional transformer tap with an active voltage regulator has been developed, the active voltage regulator obtains energy through a second winding of a converter transformer, the voltage regulating function is realized by a cascaded AC/AC converter, and the voltage on a first winding is changed by regulating the potential at the bottommost end of the first winding, so that the effect of regulating the voltage on a valve side is achieved.
However, when a serious voltage drop fault occurs in an ac or dc system connected to the outside of the active voltage regulator, the active voltage regulator may be over-current or over-voltage. Therefore, a reasonably designed ac fault ride-through structure of the active voltage regulator is needed.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above-mentioned drawbacks, the present invention provides a fault ride-through circuit of an active voltage regulator, including: a converter transformer and an active voltage regulator;
the positive output end of the inversion side of the active voltage regulator is connected with the lowest end of a first winding of the converter transformer;
the positive output end of the inversion side of the active voltage regulator is connected with a second winding of the converter transformer through a quick switching device;
the negative output end of the inversion side of the active voltage regulator is grounded or grounded through small impedance;
and the rectifying side of the active voltage regulator is connected with two ends of the second winding of the converter transformer through an energy-taking transformer.
Preferably, the fast switching device comprises at least one of: the thyristor bypass switch, the insulated gate bipolar transistor, the fast switch and the thyristor bypass switch are connected with the breaker in parallel.
Preferably, the converter transformer is composed of a first winding, a second winding, a third winding and a tap.
Furthermore, two ends of the third winding are connected to a direct current system through a converter valve.
Preferably, the active voltage regulator includes: the energy-taking device comprises an AC/AC serial branch, an energy-taking transformer and a bypass switch device;
the negative output end of the inversion side of the AC/AC serial branch is grounded;
the positive output end of the inversion side of the AC/AC serial branch is connected with the lowest end of a first winding of a converter transformer;
a bypass switch device is connected between the negative output end of the rectification side of the AC/AC serial branch and the positive output end of the inversion side of the AC/AC serial branch;
and the rectifying side of the AC/AC serial branch is connected with two ends of the second winding of the converter transformer through an energy-taking transformer.
Further, the AC/AC series branch is composed of a plurality of AC/AC units, wherein the AC/AC units are composed of a first branch, a second branch, a third branch, a fourth branch and a fifth branch which are sequentially connected in parallel, the first branch, the second branch, the fourth branch and the fifth branch are composed of two power modules connected in series, and the third branch is a capacitor branch.
Further, a connection point between two power modules connected in series in the first branch and a connection point between two power modules connected in series in the second branch are respectively a positive and negative output terminal at a rectification side of the AC/AC unit, a connection point between two power modules connected in series in the fourth branch and a connection point between two power modules connected in series in the fifth branch are respectively the positive and negative output ends of the AC/AC unit on the inversion side, the rectifying sides of all the AC/AC units in the AC/AC series branch are the rectifying sides of the AC/AC series branch, the positive output end of the inversion side of the first AC/AC unit in the AC/AC serial branch is the positive output end of the inversion side of the AC/AC serial branch, and the negative output end of the inversion side of the last AC/AC unit in the AC/AC serial branch is the negative output end of the inversion side of the AC/AC serial branch.
Further, the bypass switching device includes at least one of: breaker, contactor, IGBT, fast switch, TBS parallel circuit breaker.
Preferably, the positive output end of the inversion side of the active voltage regulator is connected to any point between two ends of the second winding of the converter transformer through a fast switching device.
One or more technical schemes of the utility model at least have one or more of the following beneficial effects:
the utility model provides a fault ride-through circuit of an active voltage regulator, which comprises: a converter transformer and an active voltage regulator; the positive output end of the inversion side of the active voltage regulator is connected with the lowest end of a first winding of the converter transformer; the positive output end of the inversion side of the active voltage regulator is connected with a second winding of the converter transformer through a quick switching device; the negative output end of the inversion side of the active voltage regulator is grounded; and the rectifying side of the active voltage regulator is connected with two ends of the second winding of the converter transformer through an energy-taking transformer. The technical scheme can quit the operation of the active voltage regulator when the external part of the active voltage regulator has serious faults, avoids the problems of overcurrent and overvoltage of the voltage regulator, and can not cause any influence on the operation of the converter transformer due to the quit of the voltage regulator.
Drawings
Fig. 1 is a main block diagram of a fault ride-through circuit of an active voltage regulator according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a single AC/AC structure inside the active voltage regulator in the present embodiment;
fig. 3 is a schematic diagram of a locked path of the active voltage regulator when the active voltage regulator in the present embodiment adopts a conducting fast switching device and locks the active voltage regulator strategy to pass through the fault;
fig. 4 is a schematic diagram of a path of the active voltage regulator after being locked when the active voltage regulator adopts a strategy of conducting a bypass switching device to pass through a fault in the present embodiment.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a fault ride-through circuit for an active voltage regulator according to an embodiment of the present invention, which specifically includes: a converter transformer and an active voltage regulator;
the positive output end of the inversion side of the active voltage regulator is connected with the lowest end of a first winding of the converter transformer;
the positive output end of the inversion side of the active voltage regulator is connected with a second winding of the converter transformer through a quick switching device;
the negative output end of the inversion side of the active voltage regulator is grounded or grounded through small impedance;
and the rectifying side of the active voltage regulator is connected with two ends of the second winding of the converter transformer through an energy-taking transformer.
In this embodiment, the positive output end of the inverting side of the active voltage regulator is connected to any point between two ends of the second winding of the converter transformer through the fast switching device.
In an embodiment, any point between two ends of the second winding may be a tap on the second winding, and if the bottommost end of the first winding of the converter transformer in the dc system voltage adjustment system is connected to the tap on the second winding through the fast switching device, the tap may be adjusted to a tap position corresponding to a tap position instruction issued by the dc system.
In this embodiment, the fast switching device includes at least one of the following: the thyristor bypass switch, the insulated gate bipolar transistor, the fast switch and the thyristor bypass switch are connected with the breaker in parallel.
In this embodiment, the converter transformer is composed of a first winding, a second winding, a third winding, and a tap.
In this embodiment, two ends of the third winding are connected to the dc system through the converter valve.
In this embodiment, the active voltage regulator includes: the energy-taking device comprises an AC/AC serial branch, an energy-taking transformer and a bypass switch device;
the negative output end of the inversion side of the AC/AC serial branch is grounded;
the positive output end of the inversion side of the AC/AC serial branch is connected with the lowest end of a first winding of a converter transformer;
a bypass switch device is connected between the negative output end of the rectification side of the AC/AC serial branch and the positive output end of the inversion side of the AC/AC serial branch;
and the rectifying side of the AC/AC serial branch is connected with two ends of the second winding of the converter transformer through an energy-taking transformer.
The AC/AC series branch circuit is composed of a plurality of AC/AC units, as shown in fig. 2, wherein the AC/AC units are composed of a first branch circuit, a second branch circuit, a third branch circuit, a fourth branch circuit, and a fifth branch circuit, which are connected in parallel in sequence, the first branch circuit, the second branch circuit, the fourth branch circuit, and the fifth branch circuit are composed of two power modules connected in series, and the third branch circuit is a capacitor branch circuit.
Further, a connection point between two power modules connected in series in the first branch and a connection point between two power modules connected in series in the second branch are respectively a positive and negative output terminal at a rectification side of the AC/AC unit, a connection point between two power modules connected in series in the fourth branch and a connection point between two power modules connected in series in the fifth branch are respectively the positive and negative output ends of the AC/AC unit on the inversion side, the rectifying sides of all the AC/AC units in the AC/AC series branch are the rectifying sides of the AC/AC series branch, the positive output end of the inversion side of the first AC/AC unit in the AC/AC serial branch is the positive output end of the inversion side of the AC/AC serial branch, and the negative output end of the inversion side of the last AC/AC unit in the AC/AC serial branch is the negative output end of the inversion side of the AC/AC serial branch.
Wherein the bypass switching device comprises at least one of: breaker, contactor, IGBT, fast switch, TBS parallel circuit breaker.
Based on the fault ride-through circuit of the active voltage regulator, the utility model also provides a fault ride-through method based on the fault ride-through circuit of the active voltage regulator, and the method comprises the following steps:
turning on the fast switching means and latching the active voltage regulator, or, turning on the bypass switching means.
Preferably, before turning on the fast switching device and locking the active voltage regulator, the method includes: and adjusting the tap to the gear corresponding to the tap gear instruction issued by the direct current system.
In one embodiment, the structure shown in fig. 2 may be used as an application scenario, and in the application scenario shown in fig. 2, when a fault occurs, a connection point between the fast switching device and the second winding is moved to a specified position, where the position may be determined according to a tap gear instruction issued by the dc system to the second winding; then, locking the voltage regulator, sending out a trigger signal of the fast switching device, and supplying power to the converter valve side by the first winding and the second winding together, as shown in fig. 3;
if the fault voltage drop depth of the alternating-current bus is large and is close to metal grounding, when a fault comes out, the connection point of the fast switching device and the second winding can be directly moved to a point p1 or a point p2, then the voltage regulator is locked, a trigger signal of the fast switching device is sent out, and the first winding and the second winding supply power to the converter valve side together; alternatively, the bypass switching means may be triggered directly after the fast switching means is determined to be in the off-state, and power may be supplied to the converter valve side only from the first winding.
If the fast switching device fails to operate during the above process, the bypass switching device may be directly triggered after the fast switching device is determined to be in the off state during fault ride-through, and only the first winding supplies power to the converter valve side, as shown in fig. 4.
And after the fault is recovered, unlocking the voltage regulator, and stopping sending the trigger signal of the quick switching device or triggering the bypass switching device. If the rapid switch or the bypass switch device rejects the action in the process, the active voltage regulator is locked after the rejection is determined.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the utility model without departing from the spirit and scope of the utility model, which is to be covered by the claims.
Claims (9)
1. A fault ride-through circuit for an active voltage regulator, the fault ride-through circuit comprising: a converter transformer and an active voltage regulator;
the positive output end of the inversion side of the active voltage regulator is connected with the lowest end of a first winding of the converter transformer;
the positive output end of the inversion side of the active voltage regulator is connected with a second winding of the converter transformer through a quick switching device;
the negative output end of the inversion side of the active voltage regulator is grounded or grounded through small impedance;
and the rectifying side of the active voltage regulator is connected with two ends of the second winding of the converter transformer through an energy-taking transformer.
2. The fault ride-through circuit of claim 1, wherein the fast switching device comprises at least one of: the thyristor bypass switch, the insulated gate bipolar transistor, the fast switch and the thyristor bypass switch are connected with the breaker in parallel.
3. The fault ride-through circuit of claim 1, wherein the converter transformer is comprised of a first winding, a second winding, a third winding, and a tap.
4. The fault ride-through circuit of claim 3, wherein the dc system is switched in across the third winding via a converter valve.
5. The fault ride-through circuit of claim 1, wherein the active voltage regulator comprises: the energy-taking device comprises an AC/AC serial branch, an energy-taking transformer and a bypass switch device;
the negative output end of the inversion side of the AC/AC serial branch is grounded;
the positive output end of the inversion side of the AC/AC serial branch is connected with the lowest end of a first winding of a converter transformer;
a bypass switch device is connected between the negative output end of the rectification side of the AC/AC serial branch and the positive output end of the inversion side of the AC/AC serial branch;
and the rectifying side of the AC/AC serial branch is connected with two ends of the second winding of the converter transformer through an energy-taking transformer.
6. The fault ride-through circuit of claim 5, wherein the AC/AC series branch is comprised of a plurality of AC/AC units, wherein the AC/AC units are comprised of a first branch, a second branch, a third branch, a fourth branch, and a fifth branch connected in parallel in that order, wherein the first branch, the second branch, the fourth branch, and the fifth branch are each comprised of two power modules connected in series, and wherein the third branch is a capacitive branch.
7. The fault ride-through circuit of claim 6, wherein a connection point between two serially connected power modules in the first branch and a connection point between two serially connected power modules in the second branch are positive and negative output terminals on a rectification side of the AC/AC unit, respectively, a connection point between two serially connected power modules in the fourth branch and a connection point between two serially connected power modules in the fifth branch are positive and negative output terminals on an inversion side of the AC/AC unit, respectively, the rectification sides of all AC/AC units in the AC/AC serial branch are the rectification sides of the AC/AC serial branch, the positive output terminal on the inversion side of a first AC/AC unit in the AC/AC serial branch is the positive output terminal on the inversion side of the AC/AC serial branch, and the negative output terminal on the inversion side of a last AC/AC unit in the AC/AC serial branch is the negative output terminal on the AC/dc serial branch And the negative output end of the inversion side of the AC serial branch.
8. The fault ride-through circuit of claim 5, wherein the bypass switching device comprises at least one of: breaker, contactor, IGBT, fast switch, TBS parallel circuit breaker.
9. The fault ride-through circuit of claim 1, wherein the positive output terminal of the inverting side of the active voltage regulator is connected to any point across the second winding of the converter transformer through a fast switching device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121839276.0U CN216162403U (en) | 2021-08-06 | 2021-08-06 | Fault ride-through circuit of active voltage regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121839276.0U CN216162403U (en) | 2021-08-06 | 2021-08-06 | Fault ride-through circuit of active voltage regulator |
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| Publication Number | Publication Date |
|---|---|
| CN216162403U true CN216162403U (en) | 2022-04-01 |
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| CN202121839276.0U Active CN216162403U (en) | 2021-08-06 | 2021-08-06 | Fault ride-through circuit of active voltage regulator |
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2021
- 2021-08-06 CN CN202121839276.0U patent/CN216162403U/en active Active
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