CN103580054A - Converter valve alternating current system 1s fault tolerance property analysis method - Google Patents
Converter valve alternating current system 1s fault tolerance property analysis method Download PDFInfo
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Abstract
The invention relates to a fault current analysis method of a high-voltage DC transmission system, in particular to a converter valve alternating current system 1s fault tolerance property analysis method. The method includes the steps of step 1, simulating a converter valve alternating current system alternating current side 1s fault, step 2, determining the thermal stress limit of a thyristor converter valve, and step 3, determining the maximum direct current which can pass through the thyristor valve when the 1s fault happens to the alternating current system. According to the method, the thermal stress limit of the thyristor valve is calculated in a simulation way, in addition, the maximum current that the thyristor converter valve can bear when the 1s fault happens to the alternating current system is calculated according to the limit, and therefore a basis is provided for design and operation of the converter valve.
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 resistance characteristics analytical method.
Background technology
Converter valve is the nucleus equipment of HVDC (High Voltage Direct Current) transmission system, and its runnability has directly determined the runnability of direct current system.Fault in ac transmission system makes to be greater than 30% of normal voltage in three measured phase average commutating voltage values of current conversion station ac bus, but be less than extremely minimum continuous working voltage and last up in period of one second, direct current system should be able to continuous and steady operation, and the maximum direct current that can move under this condition 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 resistance characteristics analytical method, the method adopts emulation mode to calculate the thermal stress limit of thyristor valve, and calculated when exchanging 1s fault according to this limit, 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 resistance characteristics analytical method, its improvements are, described method comprises the steps:
(1) simulation converter valve AC system AC 1s fault;
(2) determine the thermal stress limit of thyristor valves;
(3) determine the thyristor valve maximum direct current that thyristor valve can pass through when AC system 1s fault.
Preferably, in described step (1), converter valve AC system is 12 pulse conversion units, by two 6 pulse conversion units, is composed in series;
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 forms by upper and lower two brachium pontis, and each brachium pontis forms by converter valve; Each converter valve two ends valve arrester in parallel;
Described converter valve comprises stray capacitance in damping circuit, the equal hydraulic circuit of direct current, thyristor, saturable reactor and valve; After described damping circuit, the equal hydraulic circuit of direct current and thyristor parallel connection, form the equal hydraulic circuit-thyristor of damping circuit-direct current parallel branch, the equal hydraulic circuit-thyristor of damping circuit-direct current 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, one is triangle connection.
Preferably, in described step (2), by the method for integration, determine the thermal stress limit (the loss limit) of thyristor valves, 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 is 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 the maximum direct current that thyristor valve thyristor valve when the AC system 1s fault can pass through.Direct current difference will cause the current instantaneous value in formula (1-1) also to change thereupon, and when the loss in formula (1-1) is determined, the corresponding direct current of transient current is determined corresponding, in simulation calculation, by iterative method, obtained.
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, neatly the voltage-drop at any ratio of analog AC system voltage;
2. the present invention calculates the thermal stress limit of thyristor valves by the method for integration, calculates fast, and result is accurate;
3. the present invention, according to the voltage after the thermal stress limit of thyristor valves and fault in ac transmission system, can accurately draw the thyristor valve maximum direct current that thyristor valve can pass through when AC system 1s fault.
Accompanying drawing explanation
Fig. 1 is the flow chart of converter valve AC system 1s fault resistance characteristics 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 while being down to 80%;
Fig. 5 is certain engineering direct voltage provided by the invention direct voltage electric heating simulation waveform figure while being down to 80%;
Fig. 6 is certain engineering direct voltage provided by the invention direct current electric heating simulation waveform figure while being down to 80%;
Fig. 7 is certain engineering direct voltage provided by the invention thyristor loss electric heating simulation waveform figure while being down to 60%;
Fig. 8 is certain engineering direct voltage provided by the invention direct voltage electric heating simulation waveform figure while being down to 60%;
Fig. 9 is certain engineering direct voltage provided by the invention direct current electric heating simulation waveform figure while being down to 60%;
Figure 10 is certain engineering direct voltage provided by the invention thyristor loss electric heating simulation waveform figure while being down to 40%;
Figure 11 is certain engineering direct voltage provided by the invention direct voltage electric heating simulation waveform figure while being down to 40%;
Figure 12 is certain engineering direct voltage provided by the invention direct current electric heating simulation waveform figure while 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 resistance characteristics 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, by two 6 pulse conversion units, is composed in series; 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 forms by upper and lower two brachium pontis, and each brachium pontis forms by converter valve; Each converter valve two ends valve arrester in parallel; 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; After described damping circuit, the equal hydraulic circuit of direct current and thyristor parallel connection, form the equal hydraulic circuit-thyristor of damping circuit-direct current parallel branch, the equal hydraulic circuit-thyristor of damping circuit-direct current 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, one is triangle connection.
(2) by the method for integration, calculate the thermal stress limit (the loss limit) of thyristor valves, 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 is 0.02s.
(3) according to the voltage after the thermal stress limit of thyristor valves and fault in ac transmission system, draw the maximum direct current that thyristor valve thyristor valve when the AC system 1s fault can pass through.Direct current difference will cause the current instantaneous value in formula (1-1) also to change thereupon, and when the loss in formula (1-1) is determined, the corresponding direct current of transient current is determined corresponding, in simulation calculation, by iterative method, obtained.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.
Take ± 800kV/4500A engineering application 7.2kV is example during thyristor, and when the hottest thyristor junction temperature reaches 90 ℃, the now loss of single thyristor is: 3.53kW.Under the restriction of this loss limit value, when alternating voltage be respectively rated value 40%, 60%, 80% time, when direct current reaches respectively 4.81kA, 4.98kA, 5.13kA, single thyristor loss is 3.53kW, therefore, can obtain the AC system 1s fault resistance characteristics of this project.40%, the oscillogram of the emulation of thyristor loss electric heating, the emulation of direct voltage electric heating and the emulation of direct current electric heating 60%, 80% time is 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 the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (6)
1. a converter valve AC system 1s fault resistance characteristics analytical method, is characterized in that, described method comprises the steps:
(1) simulation converter valve AC system AC 1s fault;
(2) determine the thermal stress limit of thyristor valves;
(3) determine the thyristor valve maximum direct current that thyristor valve can pass through when AC system 1s fault.
2. 1s fault resistance characteristics analytical method as claimed in claim 1, is characterized in that, in described step (1), converter valve AC system is 12 pulse conversion units, by two 6 pulse conversion units, is composed in series;
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.
3. analytical method as claimed in claim 2, is characterized in that, 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 forms by upper and lower two brachium pontis, and each brachium pontis forms by converter valve; Each converter valve two ends valve arrester in parallel;
Described converter valve comprises stray capacitance in damping circuit, the equal hydraulic circuit of direct current, thyristor, saturable reactor and valve; After described damping circuit, the equal hydraulic circuit of direct current and thyristor parallel connection, form the equal hydraulic circuit-thyristor of damping circuit-direct current parallel branch, the equal hydraulic circuit-thyristor of damping circuit-direct current parallel branch is connected in parallel with stray capacitance in valve with saturable reactor.
4. analytical method as claimed in claim 2, is characterized in that, two converter transformers of two 6 pulse conversion units, and one is star-like connection, one is triangle connection.
5. 1s fault resistance characteristics analytical method as claimed in claim 1, is characterized in that, in described step (2), determines the thermal stress limit of thyristor valves by the method for integration, is 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 is 0.02s.
6. 1s fault resistance characteristics analytical method as claimed in claim 1, it is characterized in that, in described step (3), according to the voltage after the thermal stress limit of thyristor valves and fault in ac transmission system, draw the maximum direct current that thyristor valve thyristor valve when the AC system 1s fault can pass through.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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. |
| CN109557391A (en) * | 2018-11-21 | 2019-04-02 | 中电普瑞电力工程有限公司 | Flexible direct current converter valve fault simulation mechanism and system |
| CN112003484A (en) * | 2020-08-21 | 2020-11-27 | 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 |
| CN113514744A (en) * | 2021-09-14 | 2021-10-19 | 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136807B (en) * | 2011-03-08 | 2014-03-19 | 中国电力科学研究院 | Damping parameter designing method of novel converter valve |
| CN103323790B (en) * | 2013-06-07 | 2015-09-23 | 华北电力大学 | Based on the commutation failure analytical method of direct current transportation inverter side two-phase short-circuit fault |
-
2013
- 2013-11-15 CN CN201310573365.9A patent/CN103580054B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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. |
| CN109557391A (en) * | 2018-11-21 | 2019-04-02 | 中电普瑞电力工程有限公司 | Flexible direct current converter valve fault simulation mechanism and system |
| CN112003484A (en) * | 2020-08-21 | 2020-11-27 | 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 |
| CN113514744A (en) * | 2021-09-14 | 2021-10-19 | 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 |
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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. |