CN110954799A - TBS valve bank thyristor level online state detection method in UPFC - Google Patents
TBS valve bank thyristor level online state detection method in UPFC Download PDFInfo
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- CN110954799A CN110954799A CN201811122223.XA CN201811122223A CN110954799A CN 110954799 A CN110954799 A CN 110954799A CN 201811122223 A CN201811122223 A CN 201811122223A CN 110954799 A CN110954799 A CN 110954799A
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- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 230000002159 abnormal effect Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 7
- 230000001960 triggered effect Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 description 8
- 238000013016 damping Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2601—Apparatus or methods therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2607—Circuits therefor
- G01R31/263—Circuits therefor for testing thyristors
Abstract
The invention relates to a method for detecting the thyristor level online state of a TBS valve bank in a UPFC.A trigger synchronization signal FCS triggers each level of thyristor level step by step in each phase branch when the TBS is in a charging no-current state, an IP signal is established by a forward voltage generated by the trigger synchronization signal FCS in each period to detect and judge the forward voltage establishment state of each level of thyristor level of the TBS, and if the IP signal is not established by the forward voltage of the corresponding thyristor level in a threshold period, the detection loop of the thyristor level is judged to be abnormal; when the thyristor level detection loop is normal and the trigger synchronization signal FCS is in an effective range, triggering the thyristor level by using a plurality of trigger signal pulses, establishing an IP signal state at the forward voltage after the trigger signal pulses, and judging the thyristor level trigger function.
Description
Technical Field
The invention relates to a thyristor-level online state detection method for a TBS valve bank in a UPFC, and belongs to the technical field of power systems.
Background
The Unified Power Flow Controller (UPFC) is by far the most fully functional flexible ac transmission device (FACTS). The method can quickly and independently control active power and reactive power, realize tidal current regulation in all directions, improve the transmission capacity of a line and realize the optimized operation of a power grid; and the voltage of the access point can be dynamically supported, and the system voltage and power angle stability are improved. The UPFC can provide an effective solution for some problems in the operation and development of the power grid, and is characterized in that:
1) the directional transmission of the tide can be accurately adjusted, the controllability of an alternating current transmission line is improved, and particularly the regulation and control capability of the tide of an electromagnetic ring network is improved, so that the power transmission capability of a power transmission channel can be fully exerted, the overload and nest electricity phenomena are reduced, and the network loss is reduced.
2) The safety and stability of the system can be comprehensively improved, such as: the transient stability of the power system can be improved by utilizing the rapid control capability of the power system; the stable operation voltage and the recovery voltage after the fault are regulated through proper reactive power, and the control capability of the voltage of the power grid is improved; the damping of the system is enhanced to suppress the oscillation of the system, improve the dynamic stability of the system, and the like.
3) The fault current is detected in real time to rapidly control the power electronic device, so that the short-circuit current is reduced.
4) The method can exert strong power flow control capability of the alternating current transmission line, improve the transient stability of the power system and inhibit the oscillation capability of the system, thereby reducing or relieving the erection of new lines and having extremely obvious economic and social benefits.
A Thyristor Bypass Switch (TBS) is connected across the valve side winding of the UPFC series transformer. The TBS has the main functions that when a line fault, a transformer fault or a fault of a series converter area occurs, a series side device (comprising a converter, a series transformer and the like) is quickly conducted to bypass and be isolated from an alternating current line, so that mutual influence of faults of an alternating current system and the valve area is avoided, and the reliability of the system is improved; and when the system normally operates, the TBS must be disconnected, so that the voltage generated by the series side converter can be coupled into a line through a series transformer for power flow optimization control.
The thyristor of the TBS valve is in an off state during normal operation, and it cannot be determined whether the thyristor valve is normal in real time, so that the TBS valve cannot be used to reliably determine whether the thyristor and the trigger circuit are good or bad by using an online detection means as with other devices.
Disclosure of Invention
The invention aims to solve the technical problems that: the defects of the technology are overcome, and an online state detection method for a thyristor level of a Thyristor Bypass Switch (TBS) valve block in a UPFC is provided to ensure the reliability of the function of the TBS valve block before the failure of the UPFC system.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: when TBS is in a charging no-current state, in each phase of branch, each level of thyristor level is triggered step by a trigger synchronization signal FCS, an IP signal is established by a forward voltage generated by the trigger synchronization signal FCS in each period to detect and judge the forward voltage establishment state of each level of thyristor level in TBS, and if the forward voltage establishment IP signal of the corresponding thyristor level is not received in a threshold period, the detection loop of the thyristor level is judged to be abnormal; when the thyristor level detection loop is normal and the trigger synchronization signal FCS is in an effective range, triggering the thyristor level by using a plurality of trigger signal pulses, establishing an IP signal state at the forward voltage after the trigger signal pulses, and judging the thyristor level trigger function.
The scheme is further improved in that: the threshold period is a power frequency period, i.e., 20 milliseconds.
The scheme is further improved in that: the return detection window is 90 microseconds.
The TBS valve bank thyristor level online state detection method in the UPFC provided by the invention can be used for detecting each thyristor level damping loop, TCU forward detection function, thyristor normal, return detection optical fiber and trigger function under the condition that the TBS valve locking state does not affect the normal TBS protection function; the thyristor valve can be effectively ensured to be quickly conducted when the system side or the valve side fails; the TBS valve can effectively solve the difficult problem that the quality of the thyristor and the trigger circuit can not be reliably judged by completely utilizing an online detection means like other equipment; the TBS valve group in the UPFC can be adapted, and the online detection of the function is easy to realize.
Drawings
FIG. 1: timing diagram of a preferred embodiment of the present invention.
Detailed Description
Examples
In the method for detecting the online state of the thyristor level of the TBS valve bank in the UPFC of this embodiment, when the TBS is in a charging no-current state, each level of thyristor level is triggered step by a trigger synchronization signal FCS in each phase of branch, an IP signal is established by a forward voltage generated by the trigger synchronization signal FCS of each period to detect and determine the forward voltage establishment state of each level of thyristor level of the TBS, and if the IP signal is not established by the forward voltage of the corresponding thyristor level within a threshold period, it is determined that the detection loop of the thyristor level is abnormal; when the thyristor level detection loop is normal and the trigger synchronization signal FCS is in an effective range, triggering the thyristor level by using a plurality of trigger signal pulses, establishing an IP signal state at the forward voltage after the trigger signal pulses, and judging the thyristor level trigger function.
The UPFC considers the protection of important equipment such as a converter, a series transformer and the like, is provided with protection measures such as a network side fast bypass switch, a valve side (a bridging arrester, a thyristor bypass switch, a fast bypass switch and a ground-to-ground arrester) and a line switch, and ensures the safety of UPFC main equipment through the coordination control cooperation of all switches.
The TBS complete function can be divided into a valve group side and a control side; the valve group side consists of 8-level anti-parallel thyristor levels (comprising a TCU module, a thyristor, a damping loop and the like), the TCU establishes an IP signal according to the forward voltage returned by the thyristor level forward voltage establishment state, receives a trigger pulse FP signal and generates a gate pulse signal to trigger the thyristor. The control side mainly completes control and detection projects by the VCU, and establishes an IP signal output trigger pulse to the TBS valve group according to a trigger synchronization signal FCS issued by the control system and a forward voltage returned by the TCU; the transmission of each signal adopts an optical fiber interface.
According to the use characteristics of the TBS in the UPFC, the thyristor of the TBS valve is in an off state in normal operation, namely the thyristor stage in the valve bank only bears pressure and is not triggered. Taking a single thyristor level of TBS as an example, detecting a forward voltage establishment signal IP in each period during normal operation, not receiving a forward voltage establishment IP signal returned by a corresponding thyristor level TCU within 20ms (or a set period), and judging that a detection loop of the thyristor level is abnormal (TCU, a damping loop and an optical fiber loop); when the trigger loop is detected (under the condition that the detection loop is normal), in order to ensure reliable detection, 3 trigger detection pulses (independent of normal TBS trigger control logic) are respectively output at 100us, 200us and 300us where a trigger synchronization signal FCS is effective, if the trigger function is normal, a thyristor level is instantly turned off after each detection pulse, a forward voltage is reestablished, and a TCU returns the forward voltage again to establish an IP signal; 90us after triggering is regarded as triggering and returned to the detection window; and the VCU judges whether the thyristor level trigger function state is normal or not according to the pulse return condition.
The timing diagram of the present embodiment is shown in fig. 1, which includes: trigger synchronization signal FCS, trigger signal FP, forward voltage build signal IP and TBS valve individual thyristor level voltage waveform diagrams. Because the antiparallel thyristor stage includes a positive and a negative two thyristors connected in parallel, the forward thyristor is tested during the forward voltage cycle and the reverse thyristor is tested during the reverse cycle.
The processing flow of the invention is as follows: detecting the TCU independently of the normal VCU; detecting a TBS thyristor level detection loop and expressing a detection process; independent of the normal trigger logic, the independent trigger logic, the detection logic and the judgment processing are carried out according to the trigger synchronous FCS signal. And the VCU reports the abnormal (normal) event information of the detection loop of the forward thyristor level of the A-phase TBS-2 level and the abnormal (normal) event information of the trigger loop of the forward thyristor level of the A-phase TBS-2 level according to the detection result.
The present invention is not limited to the above-described embodiments. All technical solutions formed by equivalent substitutions fall within the protection scope of the claims of the present invention.
Claims (3)
1. A TBS valve group thyristor level online state detection method in UPFC is characterized in that when TBS is in a charging no-current state, in each phase branch, each level of thyristor level is triggered step by a trigger synchronization signal FCS, an IP signal is established by a forward voltage generated by the trigger synchronization signal FCS of each period to detect and judge the forward voltage establishment state of each level of thyristor level of TBS, and if the forward voltage establishment IP signal of the corresponding thyristor level is not received within a threshold period, the detection loop of the thyristor level is judged to be abnormal; when the thyristor level detection loop is normal and the trigger synchronization signal FCS is in an effective range, triggering the thyristor level by using a plurality of trigger signal pulses, establishing an IP signal state at the forward voltage after the trigger signal pulses, and judging the thyristor level trigger function.
2. The method of claim 1, wherein the TBS bank thyristor level online status detection method comprises: the threshold period is a power frequency period, i.e., 20 milliseconds.
3. The method of claim 1, wherein the TBS bank thyristor level online status detection method comprises: the return detection window is 90 microseconds.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811122223.XA CN110954799A (en) | 2018-09-26 | 2018-09-26 | TBS valve bank thyristor level online state detection method in UPFC |
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| CN201811122223.XA CN110954799A (en) | 2018-09-26 | 2018-09-26 | TBS valve bank thyristor level online state detection method in UPFC |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112394269A (en) * | 2020-11-16 | 2021-02-23 | 中冶赛迪电气技术有限公司 | Thyristor fault diagnosis system of AC-AC frequency conversion device |
| CN112505496A (en) * | 2020-11-03 | 2021-03-16 | 西安交通大学 | Thyristor real-time diagnosis and prediction method for insulation abnormity in converter valve |
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| CN103457590A (en) * | 2013-08-30 | 2013-12-18 | 株洲变流技术国家工程研究中心有限公司 | Method for detecting internal overvoltage protection of light control thyristor and device for generating status signal |
| CN105116314A (en) * | 2015-06-30 | 2015-12-02 | 中国西电电气股份有限公司 | Thyristor protective trigger detection method |
| CN105703481A (en) * | 2016-03-03 | 2016-06-22 | 南京南瑞继保电气有限公司 | Converter valve voltage-sharing state consistency statistics method |
| CN108258715A (en) * | 2018-03-05 | 2018-07-06 | 南京南瑞继保电气有限公司 | A kind of bypass thyristor controlled series compensation method for inspecting and control device |
-
2018
- 2018-09-26 CN CN201811122223.XA patent/CN110954799A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1672852A (en) * | 2004-03-25 | 2005-09-28 | 株式会社大亨 | Consumable electrode gas protection arc welding method with constant current performance |
| CN102055307A (en) * | 2010-10-08 | 2011-05-11 | 广州智光电气股份有限公司 | Trigger and online monitoring system for thyristor valve group |
| CN103457590A (en) * | 2013-08-30 | 2013-12-18 | 株洲变流技术国家工程研究中心有限公司 | Method for detecting internal overvoltage protection of light control thyristor and device for generating status signal |
| CN105116314A (en) * | 2015-06-30 | 2015-12-02 | 中国西电电气股份有限公司 | Thyristor protective trigger detection method |
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| CN108258715A (en) * | 2018-03-05 | 2018-07-06 | 南京南瑞继保电气有限公司 | A kind of bypass thyristor controlled series compensation method for inspecting and control device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505496A (en) * | 2020-11-03 | 2021-03-16 | 西安交通大学 | Thyristor real-time diagnosis and prediction method for insulation abnormity in converter valve |
| CN112394269A (en) * | 2020-11-16 | 2021-02-23 | 中冶赛迪电气技术有限公司 | Thyristor fault diagnosis system of AC-AC frequency conversion device |
| CN112394269B (en) * | 2020-11-16 | 2022-11-15 | 中冶赛迪电气技术有限公司 | Thyristor fault diagnosis system of AC-AC frequency conversion device |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20220301 Address after: No.1, OTI street, Jianye District, Nanjing City, Jiangsu Province, 210019 Applicant after: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. NANJING POWER SUPPLY BRANCH Applicant after: XJ ELECTRIC Co.,Ltd. Applicant after: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. Applicant after: STATE GRID CORPORATION OF CHINA Applicant after: JIANGSU YUANNENG ELECTRIC POWER ENGINEERING Co.,Ltd. Address before: No.1, OTI street, Jianye District, Nanjing City, Jiangsu Province, 210019 Applicant before: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. NANJING POWER SUPPLY BRANCH Applicant before: XJ ELECTRIC Co.,Ltd. Applicant before: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. Applicant before: STATE GRID CORPORATION OF CHINA |
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Application publication date: 20200403 |
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