CN103580054B - A kind of converter valve AC system 1s fault tolerance property analytical method - Google Patents
A kind of converter valve AC system 1s fault tolerance property analytical method Download PDFInfo
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- CN103580054B CN103580054B CN201310573365.9A CN201310573365A CN103580054B CN 103580054 B CN103580054 B CN 103580054B CN 201310573365 A CN201310573365 A CN 201310573365A CN 103580054 B CN103580054 B CN 103580054B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The present invention relates to the failure analysis methods of HVDC (High Voltage Direct Current) transmission system, be specifically related to a kind of converter valve AC system 1s fault tolerance property analytical method.Simulation converter valve AC system AC 1s fault that the method comprises the steps: (1); (2) the thermal stress limit of thyristor valves is determined; (3) determine thyristor valve when AC system 1s fault thyristor valve by maximum direct current.The method adopts emulation mode to calculate the thermal stress limit of thyristor valve, and according to this limit teaching when exchanging 1s fault, the tolerant maximum current of thyristor valves, for the design and running of converter valve provides foundation.
Description
Technical field
The present invention relates to the failure analysis methods of HVDC (High Voltage Direct Current) transmission system, be specifically related to a kind of converter valve AC system 1s fault tolerance property analytical method.
Background technology
Converter valve is the nucleus equipment of HVDC (High Voltage Direct Current) transmission system, and its runnability directly determines the runnability of direct current system.Fault in ac transmission system makes three phase average commutating voltage values measured by current conversion station ac bus be greater than 30% of normal voltage, but be less than extremely minimum continuous working voltage and last up in the period of one second, direct current system should be able to continuous and steady operation, and the maximum direct current can run under these conditions is determined by the thermal stress limit of alternating voltage condition and thyristor valve.
Summary of the invention
For the deficiencies in the prior art, the object of this invention is to provide a kind of converter valve AC system 1s fault tolerance property analytical method, the method adopts emulation mode to calculate the thermal stress limit of thyristor valve, and according to this limit teaching when exchanging 1s fault, the tolerant maximum current of thyristor valves, for the design and running of converter valve provides foundation.
The object of the invention is to adopt following technical proposals to realize:
The invention provides a kind of converter valve AC system 1s fault tolerance property analytical method, its improvements are, described method comprises the steps:
(1) converter valve AC system AC 1s fault is simulated;
(2) the thermal stress limit of thyristor valves is determined;
(3) determine thyristor valve when AC system 1s fault thyristor valve by maximum direct current.
Preferably, in described step (1), converter valve AC system is 12 pulse conversion units, is composed in series by two 6 pulse conversion units;
AC system is equivalent to an AC power; Adopt and regulate the output voltage of this AC power to simulate converter valve AC system AC 1s fault, analog AC system voltage is at the voltage-drop of any ratio.
More preferably, described 6 pulse conversion units comprise: converter transformer, converter valve and valve arrester; Converter transformer is connected with three-phase commutation bridge by the equivalent reactance device of converter valve system; Each of three-phase commutation bridge is formed by upper and lower two brachium pontis, and each brachium pontis is formed by converter valve; Each converter valve two ends parallel valve lightning arrester;
Described converter valve comprises stray capacitance in damping circuit, the equal hydraulic circuit of direct current, thyristor, saturable reactor and valve; Form damping circuit-direct current equal hydraulic circuit-thyristor parallel branch after the equal hydraulic circuit of described damping circuit, direct current and thyristor parallel connection, damping circuit-direct current equal hydraulic circuit-thyristor parallel branch is connected in parallel with stray capacitance in valve with saturable reactor.
More preferably, two converter transformers of two 6 pulse conversion units, one is star-like connection, and one is triangle connection.
Preferably, in described step (2), by the thermal stress limit (the loss limit) of the method determination thyristor valves of integration, be shown below:
Wherein: V
t0: thyristor on-state threshold voltage, r
t: thyristor on-state slope resistance, i: current instantaneous value, T: power frequency period are 0.02s.
Preferably, in described step (3), according to the voltage after the thermal stress limit of thyristor valves and fault in ac transmission system draw thyristor valve when AC system 1s fault thyristor valve by maximum direct current.The current instantaneous value caused in formula (1-1) also changes by direct current difference thereupon, and when the loss in formula (1-1) is determined, the direct current corresponding to transient current is determined corresponding, obtains in simulation calculation by iterative method.
Compared with the prior art, the beneficial effect that the present invention reaches is:
1. the present invention adopts and regulates the form of converter transformer output voltage to carry out analog AC side 1s fault, can the voltage-drop at any ratio of analog AC system voltage neatly;
2. the method for the present invention's integration calculates the thermal stress limit of thyristor valves, and calculate quick, result is accurate;
3. the present invention is according to the voltage after the thermal stress limit of thyristor valves and fault in ac transmission system, can accurately draw thyristor valve when AC system 1s fault thyristor valve by maximum direct current.
Accompanying drawing explanation
Fig. 1 is the flow chart of converter valve AC system 1s fault tolerance property analytical method provided by the invention;
Fig. 2 is the structure chart of converter valve AC system provided by the invention;
Fig. 3 is the structure chart of single converter valve provided by the invention;
Fig. 4 is certain engineering direct voltage provided by the invention thyristor loss electric heating simulation waveform figure when being down to 80%;
Fig. 5 is certain engineering direct voltage provided by the invention direct voltage electric heating simulation waveform figure when being down to 80%;
Fig. 6 is certain engineering direct voltage provided by the invention direct current electric heating simulation waveform figure when being down to 80%;
Fig. 7 is certain engineering direct voltage provided by the invention thyristor loss electric heating simulation waveform figure when being down to 60%;
Fig. 8 is certain engineering direct voltage provided by the invention direct voltage electric heating simulation waveform figure when being down to 60%;
Fig. 9 is certain engineering direct voltage provided by the invention direct current electric heating simulation waveform figure when being down to 60%;
Figure 10 is certain engineering direct voltage provided by the invention thyristor loss electric heating simulation waveform figure when being down to 40%;
Figure 11 is certain engineering direct voltage provided by the invention direct voltage electric heating simulation waveform figure when being down to 40%;
Figure 12 is certain engineering direct voltage provided by the invention direct current electric heating simulation waveform figure when being down to 40%.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The flow chart of converter valve AC system 1s fault tolerance property analytical method provided by the invention as shown in Figure 1, comprises the steps:
(1) AC system is equivalent to an AC power; Adopt and regulate the output voltage of this AC power to simulate converter valve AC system AC 1s fault, analog AC system voltage is at the voltage-drop of any ratio.Converter valve AC system is 12 pulse conversion units, is composed in series by two 6 pulse conversion units; 6 pulse conversion units comprise: converter transformer, converter valve and valve arrester; Converter transformer is connected with three-phase commutation bridge by the equivalent reactance device of converter valve system; Each of three-phase commutation bridge is formed by upper and lower two brachium pontis, and each brachium pontis is formed by converter valve; Each converter valve two ends parallel valve lightning arrester; Its structure chart as shown in Figure 2.
The structure chart of single converter valve as shown in Figure 3, comprises stray capacitance in damping circuit, the equal hydraulic circuit of direct current, thyristor, saturable reactor and valve; Form damping circuit-direct current equal hydraulic circuit-thyristor parallel branch after the equal hydraulic circuit of described damping circuit, direct current and thyristor parallel connection, damping circuit-direct current equal hydraulic circuit-thyristor parallel branch is connected in parallel with stray capacitance in valve with saturable reactor.Two converter transformers of two 6 pulse conversion units, one is star-like connection, and one is triangle connection.
(2) calculate the thermal stress limit (the loss limit) of thyristor valves by the method for integration, be shown below:
Wherein: V
t0: thyristor on-state threshold voltage, r
t: thyristor on-state slope resistance, i: current instantaneous value, T: power frequency period are 0.02s.
(3) according to the voltage after the thermal stress limit of thyristor valves and fault in ac transmission system draw thyristor valve when AC system 1s fault thyristor valve by maximum direct current.The current instantaneous value caused in formula (1-1) also changes by direct current difference thereupon, and when the loss in formula (1-1) is determined, the direct current corresponding to transient current is determined corresponding, obtains in simulation calculation by iterative method.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.
During for ± 800kV/4500A engineer applied 7.2kV thyristor, when the hottest thyristor junction temperature reaches 90 DEG C, the now loss of single thyristor is: 3.53kW.Under the restriction of this loss limit value, when alternating voltage is respectively 40%, 60%, 80% of rated value, when direct current reaches 4.81kA, 4.98kA, 5.13kA respectively, single thyristor loss is 3.53kW, therefore, the AC system 1s fault tolerance property of this project can be obtained.40%, 60%, 80% time thyristor loss electric heating emulation, direct voltage electric heating emulation and direct current electric heating emulation oscillogram respectively as shown in Fig. 4-12,
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (1)
1. a converter valve AC system 1s fault tolerance property analytical method, is characterized in that, described method comprises the steps:
(1) converter valve AC system AC 1s fault is simulated;
(2) the thermal stress limit of thyristor valves is determined;
(3) determine thyristor valve when AC system 1s fault thyristor valve by maximum direct current;
In described step (1), converter valve AC system is 12 pulse conversion units, is composed in series by two 6 pulse conversion units;
AC system is equivalent to an AC power; Adopt and regulate the output voltage of this AC power to simulate converter valve AC system AC 1s fault, analog AC system voltage is at the voltage-drop of any ratio;
Described 6 pulse conversion units comprise: converter transformer, converter valve and valve arrester; Converter transformer is connected with three-phase commutation bridge by the equivalent reactance device of converter valve system; Each of three-phase commutation bridge is formed by upper and lower two brachium pontis, and each brachium pontis is formed by converter valve; Each converter valve two ends parallel valve lightning arrester;
Described converter valve comprises stray capacitance in damping circuit, the equal hydraulic circuit of direct current, thyristor, saturable reactor and valve; Form damping circuit-direct current equal hydraulic circuit-thyristor parallel branch after the equal hydraulic circuit of described damping circuit, direct current and thyristor parallel connection, damping circuit-direct current equal hydraulic circuit-thyristor parallel branch is connected in parallel with stray capacitance in valve with saturable reactor;
Two converter transformers of two 6 pulse conversion units, one is star-like connection, and one is triangle connection;
In described step (2), by the thermal stress limit of the method determination thyristor valves of integration, be shown below:
Wherein: V
t0: thyristor on-state threshold voltage, r
t: thyristor on-state slope resistance, i: current instantaneous value, T: power frequency period are 0.02s;
In described step (3), according to the voltage after the thermal stress limit of thyristor valves and fault in ac transmission system draw thyristor valve when AC system 1s fault thyristor valve by maximum direct current.
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| CN201310573365.9A CN103580054B (en) | 2013-11-15 | 2013-11-15 | A kind of converter valve AC system 1s fault tolerance property analytical method |
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| CN201310573365.9A CN103580054B (en) | 2013-11-15 | 2013-11-15 | A kind of converter valve AC system 1s fault tolerance property analytical method |
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| CN103580054B true CN103580054B (en) | 2015-12-09 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106329512A (en) * | 2015-06-30 | 2017-01-11 | 国网智能电网研究院 | According to the technical scheme provided by the present invention, the black-start speed and stability of the power grid are improved. |
| CN109557391B (en) * | 2018-11-21 | 2021-12-10 | 中电普瑞电力工程有限公司 | Flexible direct current converter valve fault simulation mechanism and system |
| CN112003484B (en) * | 2020-08-21 | 2021-11-19 | 中国科学院合肥物质科学研究院 | Method for calculating maximum output current of multiple thyristor converters connected in parallel |
| CN113514744B (en) * | 2021-09-14 | 2022-02-15 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and device for determining withstand voltage value of thyristor and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136807A (en) * | 2011-03-08 | 2011-07-27 | 中国电力科学研究院 | Damping parameter designing method of novel converter valve |
| CN103323790A (en) * | 2013-06-07 | 2013-09-25 | 华北电力大学 | Phase commutation failure analytical method based on direct-current transmission inverting side two-phase short-circuit fault |
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- 2013-11-15 CN CN201310573365.9A patent/CN103580054B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136807A (en) * | 2011-03-08 | 2011-07-27 | 中国电力科学研究院 | Damping parameter designing method of novel converter valve |
| CN103323790A (en) * | 2013-06-07 | 2013-09-25 | 华北电力大学 | Phase commutation failure analytical method based on direct-current transmission inverting side two-phase short-circuit fault |
Non-Patent Citations (1)
| Title |
|---|
| 1100kV/5000A换流阀在交流系统故障时的运行能力分析;张雷，李侠，刘宁，娄彦涛;《高压电器》;20121130;第48卷(第11期);98-101 * |
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Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: GLOBAL ENERGY INTERCONNECTION Research Institute Patentee after: State Grid Corporation of China Co-patentee after: CHINA-EPRI ELECTRIC POWER ENGINEERING Co.,Ltd. Co-patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: STATE GRID SMART GRID Research Institute Patentee before: State Grid Corporation of China Co-patentee before: CHINA-EPRI ELECTRIC POWER ENGINEERING Co.,Ltd. Co-patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. |
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Effective date of registration: 20170612 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: GLOBAL ENERGY INTERCONNECTION Research Institute Patentee after: State Grid Corporation of China Co-patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: GLOBAL ENERGY INTERCONNECTION Research Institute Patentee before: State Grid Corporation of China Co-patentee before: CHINA-EPRI ELECTRIC POWER ENGINEERING Co.,Ltd. Co-patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. |