CN109599835B - Power protection method and equipment for FACTS device - Google Patents
Power protection method and equipment for FACTS device Download PDFInfo
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- CN109599835B CN109599835B CN201811265589.2A CN201811265589A CN109599835B CN 109599835 B CN109599835 B CN 109599835B CN 201811265589 A CN201811265589 A CN 201811265589A CN 109599835 B CN109599835 B CN 109599835B
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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
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Abstract
The invention discloses a power protection method and equipment for an FACTS device, wherein the FACTS device comprises a converter valve, a transformer and a system access area; the converter comprises at least two converter valves, wherein the direct current sides of the at least two converter valves are connected through a direct current line, and the alternating current side of each converter valve is connected with a system access area through a transformer; the method comprises the following steps: obtaining the alternating voltage of the alternating current side of at least one converter valve; extracting a direct current component of the alternating current voltage; and executing main protection or backup protection according to the direct-current component of the alternating-current voltage. According to the invention, main protection or backup protection is executed according to the direct-current component of the alternating-current side alternating-current voltage of the converter valve or the alternating-current component of the direct-current side direct-current voltage of the converter valve, and when an alternating-current area on the alternating-current side of the converter valve has a ground fault and a direct-current area on the direct-current side of the converter valve has a ground fault, an alarm signal can be timely sent to a background of the flexible transformer substation in an overvoltage protection mode.
Description
Technical Field
The invention relates to the technical field of flexible alternating current transmission systems, in particular to a power protection method and equipment for an FACTS device.
Background
FACTS (Flexible AC Transmission Systems, chinese) devices refer to power electronic devices applied to AC Transmission Systems. The FACTS improves the value of the power transmission network by increasing the transmission capacity of the power transmission network; and the FACTS control device has high operation speed, so that the safe operation area of the power transmission network can be enlarged. The FACTS device is connected with the power system in parallel to control the voltage and reactive power of the power system, and is connected with the power system in series to control the current and power flow of the power system. Currently, FACTS devices are widely used in ac transmission systems. This can lead to a reduction in the transmission quality of the ac transmission system should the FACTS device fail.
However, the inventors have found that existing FACTS devices are relatively prone to failure.
Disclosure of Invention
In view of this, embodiments of the present invention provide a power protection method and device for FACTS devices, so as to solve the problem that the existing FACTS devices are prone to malfunction.
According to a first aspect, an embodiment of the present invention provides a power protection method for FACTS devices, where the FACTS devices include a converter valve, a transformer, and a system access area; the converter comprises at least two converter valves, wherein the direct current sides of the at least two converter valves are connected through a direct current line, the alternating current side of each converter valve is connected with a system access area through a transformer, and the system access area is used for accessing an electric power system; the method comprises the following steps: obtaining the alternating voltage of the alternating current side of at least one converter valve; extracting a direct current component of the alternating current voltage; and executing main protection or backup protection according to the direct-current component of the alternating-current voltage.
Optionally, the method further comprises: for the direct current line, performing at least one of the following power protection strategies: low-voltage overcurrent protection, differential protection, direct-current voltage unbalance protection, direct-current overvoltage protection and direct-current low-voltage protection.
Optionally, the method further comprises: for the system access zone, performing at least one of the following power protection policies: differential protection, overcurrent protection, overvoltage protection, and circuit breaker failure protection.
Optionally, the method further comprises: for the transformer, performing at least one of the following power protection strategies: non-electric quantity protection, differential protection, rich voltage over-current protection, zero sequence voltage protection and zero sequence current protection.
Optionally, the method further comprises: at least one of the following power protection strategies is implemented for the converter valve side of the transformer: differential protection, overcurrent protection, zero sequence voltage protection and overvoltage protection.
Optionally, the method further comprises: for the converter valve, at least one of the following power protection strategies is implemented: differential protection, overcurrent protection, submodule overvoltage protection and valve overcurrent protection.
According to a second aspect, embodiments of the present invention provide a power protection method for FACTS devices, where the FACTS devices include a converter valve, a transformer, and a system access area; the converter comprises at least two converter valves, wherein the direct current sides of the at least two converter valves are connected through a direct current line, the alternating current side of each converter valve is connected with a system access area through a transformer, and the system access area is used for accessing an electric power system; the method comprises the following steps: acquiring direct-current voltage of the direct-current side of at least one converter valve; extracting an alternating current component of the direct current voltage; and executing main protection or backup protection according to the alternating current component of the direct current voltage.
Optionally, the method further comprises: for the direct current line, performing at least one of the following power protection strategies: low-voltage overcurrent protection, differential protection, direct-current voltage unbalance protection, direct-current overvoltage protection and direct-current low-voltage protection.
Optionally, the transformer comprises a series transformer and/or a shunt transformer.
Optionally, the method further comprises: for the system access zone, performing at least one of the following power protection policies: differential protection, overcurrent protection, overvoltage protection, and circuit breaker failure protection.
Optionally, the method further comprises: for the transformer, performing at least one of the following power protection strategies: non-electric quantity protection, differential protection, rich voltage over-current protection, zero sequence voltage protection and zero sequence current protection.
Optionally, the method further comprises: at least one of the following power protection strategies is implemented for the converter valve side of the transformer: differential protection, overcurrent protection, zero sequence voltage protection and overvoltage protection.
Optionally, the method further comprises: for the converter valve, at least one of the following power protection strategies is implemented: differential protection, overcurrent protection, submodule overvoltage protection and valve overcurrent protection.
According to a third aspect, an embodiment of the present invention provides a power protection device, which executes the power protection method according to the first aspect, the second aspect, or any optional implementation manner thereof.
According to a third aspect, an embodiment of the present invention provides a FACTS apparatus including the power protection device of the third aspect.
Optionally, the FACTS apparatus is any one of: the system comprises a unified power flow controller, a static synchronous series compensator and a static synchronous compensator.
According to the power protection method for the FACTS device, provided by the embodiment of the invention, main protection or backup protection is executed according to the direct current component of the alternating current voltage at the alternating current side of the converter valve, so that when an alternating current area (namely an area with alternating current transmission current) at the alternating current side of the converter valve has a ground fault (for example, before the grounding line selection work of the alternating current area or in the line selection process), an alarm signal is sent to a background of a flexible transformer substation in time in an overvoltage protection mode, and operation and maintenance personnel are informed in advance.
According to the power protection method for the FACTS device, provided by the embodiment of the invention, main protection or backup protection is executed according to the alternating current component of the direct current voltage at the direct current side of the converter valve, and when a direct current region (namely, a region with direct current transmission current, as shown in a region A in fig. 1) at the direct current side of the converter valve has a ground fault, an alarm signal is sent to a background of a flexible substation in time in an overvoltage protection mode, so that operation and maintenance personnel are informed in advance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 shows a schematic structural diagram of a FACTS apparatus;
FIG. 2 illustrates a flow diagram of a power protection method for FACTS devices according to an embodiment of the present invention;
fig. 3 shows a flow diagram of another power protection method for FACTS devices, according to an embodiment of the invention.
Detailed Description
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.
The invention finds that the existing FACTS device is easy to have faults because no ground fault protection is arranged on a direct current line between converter valves and an alternating current position of the converter valves. To this end, embodiments of the present invention provide at least two power protection methods for FACTS devices. The FACTS apparatus described in this application includes a converter valve, a transformer and a system access area. The converter valves are at least two, the direct current sides of the at least two converter valves are connected through direct current lines, and the alternating current side of each converter valve is connected with a system access area through a transformer; the transformer can be a series transformer or a parallel transformer; the system access area is used for accessing the power system. As shown in fig. 1, the dc sides of the three converter valves 11, 12 and 13 are connected by a dc line, a being the dc region where the dc line is located; 21 is a shunt transformer, 22 and 23 are series transformers; 31. 32 and 33 are three system access areas, respectively.
Example one
Fig. 2 illustrates a flow chart of a power protection method for FACTS devices, which may be used for FACTS devices shown in fig. 1, according to an embodiment of the present invention. As shown in fig. 2, the method comprises the steps of:
s101: an alternating voltage on the alternating side of at least one converter valve is obtained.
For example, an alternating voltage on the alternating side of the converter valve 11 in fig. 1, i.e. the side close to the transformer 21, is obtained.
S102: a DC component of the AC voltage is extracted.
The method for extracting the dc component from the ac voltage is prior art, and is not described herein again.
S103: main protection or backup protection is performed according to a direct current component of the alternating voltage.
The method of performing main protection or backup protection according to a predetermined voltage is the prior art, and is not described in detail in this application.
According to the power protection method for the FACTS device, main protection or backup protection is performed according to the direct current component of the alternating current voltage on the alternating current side of the converter valve, and when an alternating current area (namely an area with alternating current transmission current) on the alternating current side of the converter valve has a ground fault (for example, before the grounding line selection work of the alternating current area or in the line selection process), an alarm signal is sent to a background of a flexible transformer substation in time in an overvoltage protection mode, and operation and maintenance personnel are informed in advance.
Example two
Fig. 3 illustrates a flow chart of another power protection method for FACTS devices, which may be used for FACTS devices shown in fig. 1, according to an embodiment of the present invention. As shown in fig. 3, the method comprises the steps of:
s201: the direct current voltage of the direct current side of at least one converter valve is obtained.
For example, the dc voltage on the dc side of the converter valve 11 in fig. 1, i.e. the side closer to the other converter valves, is obtained.
S202: an alternating current component of the direct current voltage is extracted.
The method for extracting the ac component from the dc voltage is prior art, and is not described herein again.
S203: main protection or backup protection is performed according to an alternating current component of the direct current voltage.
The method of performing main protection or backup protection according to a predetermined voltage is the prior art, and is not described in detail in this application.
According to the power protection method for the FACTS device, main protection or backup protection is performed according to the alternating current component of the direct current voltage on the direct current side of the converter valve, and when a direct current region (namely, a region with direct current transmission current, as shown in a region A in fig. 1) on the direct current side of the converter valve has a ground fault, an alarm signal is sent to a background of the flexible substation in time in an overvoltage protection mode, and operation and maintenance personnel are informed in advance.
It should be added that the first embodiment and the second embodiment can be combined together to form a new embodiment.
As an optional implementation manner of implementing the first embodiment or the second embodiment, the power protection method for the FACTS device further includes: for the direct current line, at least one of the following power protection strategies is implemented: low-voltage overcurrent protection, differential protection, direct-current voltage unbalance protection, direct-current overvoltage protection and direct-current low-voltage protection. These power protection strategies are prior art, and those skilled in the art can easily understand how to apply them to dc lines, and the detailed description of the present application is omitted here.
As an optional implementation manner of implementing the first embodiment or the second embodiment, the power protection method for the FACTS device further includes: for a system access zone, performing at least one of the following power protection policies: differential protection, overcurrent protection, overvoltage protection, and circuit breaker failure protection. These power protection strategies are prior art, and those skilled in the art can easily understand how to use them in the system access area, and the detailed description of the present application is omitted here.
As an optional implementation manner of implementing the first embodiment or the second embodiment, the power protection method for the FACTS device further includes: for the transformer, at least one of the following power protection strategies is implemented: non-electric quantity protection, differential protection, rich voltage over-current protection, zero sequence voltage protection and zero sequence current protection. These power protection strategies are prior art and those skilled in the art can easily understand how to apply them to transformers, and the detailed description of the present application is omitted here.
As an optional implementation manner of implementing the first embodiment or the second embodiment, the power protection method for the FACTS device further includes: at least one of the following power protection strategies is implemented for the converter valve side of the transformer: differential protection, overcurrent protection, zero sequence voltage protection and overvoltage protection. These power protection strategies are prior art, and those skilled in the art can easily understand how to apply them to the converter valve side of the transformer (e.g. the B region, the C region, or the D region in fig. 1), and the description of the present application is omitted here.
As an optional implementation manner of implementing the first embodiment or the second embodiment, the power protection method for the FACTS device further includes: for the converter valve, at least one of the following power protection strategies is implemented: differential protection, overcurrent protection, submodule overvoltage protection and valve overcurrent protection. These power protection strategies are prior art and those skilled in the art will readily understand how to implement them for converter valves, and will not be described in detail herein.
EXAMPLE III
The embodiment of the present invention provides a power protection device, which executes the power protection method described in the first embodiment, the second embodiment, or any optional implementation manner of the power protection device.
The power protection apparatus includes apparatuses necessary to perform the first embodiment or the second embodiment, such as a voltage collecting module (for collecting an alternating-current voltage or a direct-current voltage), a processor (for extracting a direct-current component of the alternating-current voltage or for extracting an alternating-current component of the direct-current voltage), and a circuit breaker, a power communication line, and the like for performing main protection or backup protection.
Example four
The embodiment of the invention provides a FACTS device, which comprises the power protection equipment described in the third embodiment.
Optionally, the FACTS apparatus is any one of: the system comprises a unified power flow controller, a static synchronous series compensator and a static synchronous compensator.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A power protection method for FACTS devices, the FACTS devices including converter valves, transformers and system access areas; the converter comprises at least two converter valves, wherein the direct current sides of the at least two converter valves are connected through a direct current line, the alternating current side of each converter valve is connected with a system access area through a transformer, and the system access area is used for accessing an electric power system; characterized in that the method comprises:
obtaining the alternating voltage of the alternating current side of at least one converter valve;
extracting a direct current component of the alternating current voltage;
and executing main protection or backup protection according to the direct-current component of the alternating-current voltage.
2. A power protection method for FACTS devices, the FACTS devices including converter valves, transformers and system access areas; the converter comprises at least two converter valves, wherein the direct current sides of the at least two converter valves are connected through a direct current line, the alternating current side of each converter valve is connected with a system access area through a transformer, and the system access area is used for accessing an electric power system; characterized in that the method comprises:
acquiring direct-current voltage of the direct-current side of at least one converter valve;
extracting an alternating current component of the direct current voltage;
and executing main protection or backup protection according to the alternating current component of the direct current voltage.
3. The power protection method for FACTS devices according to claim 1 or 2, further comprising:
for the direct current line, performing at least one of the following power protection strategies: low-voltage overcurrent protection, differential protection, direct-current voltage unbalance protection, direct-current overvoltage protection and direct-current low-voltage protection.
4. The power protection method for FACTS devices according to claim 1 or 2, further comprising:
for the system access zone, performing at least one of the following power protection policies: differential protection, overcurrent protection, overvoltage protection, and circuit breaker failure protection.
5. The power protection method for FACTS devices according to claim 1 or 2, further comprising:
for the transformer, performing at least one of the following power protection strategies: non-electric quantity protection, differential protection, rich voltage over-current protection, zero sequence voltage protection and zero sequence current protection.
6. The power protection method for FACTS devices according to claim 1 or 2, further comprising:
at least one of the following power protection strategies is implemented for the converter valve side of the transformer: differential protection, overcurrent protection, zero sequence voltage protection and overvoltage protection.
7. The power protection method for FACTS devices according to claim 1 or 2, further comprising:
for the converter valve, at least one of the following power protection strategies is implemented: differential protection, overcurrent protection, submodule overvoltage protection and valve overcurrent protection.
8. A power protection apparatus characterized by performing the power protection method of any one of claims 1 to 7.
9. A FACTS apparatus, characterized by comprising the power protection device of claim 8.
10. FACTS apparatus according to claim 9, characterized in that said FACTS apparatus is any one of the following: the system comprises a unified power flow controller, a static synchronous series compensator and a static synchronous compensator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811265589.2A CN109599835B (en) | 2018-10-29 | 2018-10-29 | Power protection method and equipment for FACTS device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811265589.2A CN109599835B (en) | 2018-10-29 | 2018-10-29 | Power protection method and equipment for FACTS device |
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| CN109599835A CN109599835A (en) | 2019-04-09 |
| CN109599835B true CN109599835B (en) | 2020-04-17 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332968A (en) * | 2014-10-20 | 2015-02-04 | 国家电网公司 | Current differential protection method based on high voltage DC transmission line |
| CN106356883A (en) * | 2016-10-24 | 2017-01-25 | 南方电网科学研究院有限责任公司 | Multi-terminal flexible direct-current power transmission control method |
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2018
- 2018-10-29 CN CN201811265589.2A patent/CN109599835B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332968A (en) * | 2014-10-20 | 2015-02-04 | 国家电网公司 | Current differential protection method based on high voltage DC transmission line |
| CN106356883A (en) * | 2016-10-24 | 2017-01-25 | 南方电网科学研究院有限责任公司 | Multi-terminal flexible direct-current power transmission control method |
Non-Patent Citations (2)
| Title |
|---|
| 柔性直流输电换流器故障特性分析及诊断研究;孙晓云，高鑫，刘延华;《电力系统保护与控制》;20170116;第45卷(第2期);第1-3节 * |
| 柔性直流输电系统中IGBT阀的故障诊断方法;孙晓云，同向前，高鑫;《电工技术学报》;20140831;第29卷(第8期);第2-3节 * |
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