CN101345508B - Controllable afterflow method of magnetic controlled shunt reactor - Google Patents
Controllable afterflow method of magnetic controlled shunt reactor Download PDFInfo
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- CN101345508B CN101345508B CN200810105711XA CN200810105711A CN101345508B CN 101345508 B CN101345508 B CN 101345508B CN 200810105711X A CN200810105711X A CN 200810105711XA CN 200810105711 A CN200810105711 A CN 200810105711A CN 101345508 B CN101345508 B CN 101345508B
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Abstract
The invention relates to magnet control type parallel reactor controllable afterflow method and excitation system. The present method comprises following steps: a controllable afterflow branch constituted by thyristor valve parallel to DC bus two pole is installed at magnet control type parallel reactor excitation system, the cathode of thyristor valve is connected with anode of DC bus, the anodeof thyristor valve is connected with cathode of DC bus;when rectifier is under normal operation state, DC excitation current, rectifier and excitation branch constitutes loop, thyristor valve of controllable afterflow branch does not conduct; when open phase operation or three phase tripping of transmission line occurs, control circuit locks rectifier and triggers pulse and controllable afterflowbranch thyristor valve, controllable afterflow branch conducts and DC exitation current transfers from rectifier to controllable afterflow branch to constitute loop, thyristor valves of rectifier totally shut off. The invention solves the technical problem of magnet control type parallel reactor excitation branch afterflow, which is significant to safety and reliable operation of magnet control type parallel reactor.
Description
Technical field
The present invention relates to a kind of controllable afterflow method, particularly about a kind of magnetic control type paralleling reactor controllable afterflow method.
Background technology
In superhigh pressure and extra-high voltage grid, controllable parallel reactors can effectively solve the contradiction between reactive power compensation and the over-voltage, is the indispensable technological means of extra-high voltage grid reactive power, has broad application prospects.Magnetic control type paralleling reactor is controlled magnetic saturation degree unshakable in one's determination, thereby is adjusted its reactance value continuously, steadily, apace, thereby have very superior control performance by changing the size of DC excitation electric current.
The magnetic control type paralleling reactor field excitation winding is positioned at controllable parallel reactors body secondary side, and excitation winding connects into open-delta, and the open-delta two ends connect the dc bus positive and negative polarities respectively, and the DC excitation size of current that it flows through is controlled by rectifier.When transmission line generation open-phase operation or three-phase tripping operation, higher overvoltage may appear in the open-delta two ends, works the mischief to rectifier.Traditional solution is the DC side parallel contactor at rectifier, eliminates overvoltage by closed contactor when circuit generation open-phase operation or three-phase tripping operation.In order to make contactor in parallel reliably closed, precondition is the effective locking of rectifier, and promptly the thyristor valve of rectifier all turn-offs.In order to realize the effective locking of rectifier, the DC excitation electric current need be transferred to the afterflow branch road from rectifier, for the shutoff of thyristor valve creates conditions.
Summary of the invention
At the problems referred to above, the objective of the invention is to propose a kind of reliability height, the fast magnetic control type paralleling reactor controllable afterflow method of response speed.
For achieving the above object, the present invention takes following technical scheme: a kind of magnetic control type paralleling reactor controllable afterflow method, it may further comprise the steps: 1) be provided with one in the magnetic control type paralleling reactor field excitation system and be connected in parallel on the controllable afterflow branch road that dc bus the two poles of the earth constitute by thyristor valve, the negative electrode of described thyristor valve connects the positive pole of dc bus, and anode connects the negative pole of dc bus; 2) when rectifier is in normal operating conditions, the DC excitation electric current constitutes loop, the not conducting of thyristor valve of controllable afterflow branch road by rectifier and field excitation branch line; 3) when transmission line generation open-phase operation or three-phase tripping operation, control circuit locking rectifier trigger pulse, trigger the thyristor valve of controllable afterflow branch road simultaneously, the conducting of controllable afterflow branch road, the DC excitation electric current is transferred to the controllable afterflow branch road from rectifier and constitutes the loop, and the rectifier thyristor valve all turn-offs simultaneously.
The present invention is owing to take above technical scheme, it has the following advantages: during 1, owing to the rectifier operate as normal among the present invention, and the not conducting of thyristor valve of controllable afterflow branch road, rectifier can work in inverter mode, therefore can reduce exciting current rapidly, improve response speed.2, when transmission line generation open-phase operation or three-phase tripping operation, trigger controllable afterflow branch road thyristor valve in the time of control circuit locking rectifier trigger pulse, can in the shortest time, realize effective locking of rectifier, for the closure of contactor in parallel creates conditions.3, the controllable afterflow branch road of the present invention's employing is simple in structure, reliability is high, control is convenient, cost is low, has guaranteed safety, the reliability service of excitation system.The present invention has well solved the technical barrier of magnetic control type paralleling reactor field excitation branch line afterflow, has crucial meaning for safety, the reliability service of magnetic control type paralleling reactor.
Description of drawings
Fig. 1 is a magnetic control type paralleling reactor controllable afterflow electrical principle wiring schematic diagram of the present invention
Rectifier transformer secondary side line current waveform schematic diagram when Fig. 2 is a rectifier operate as normal of the present invention
Rectifier transformer secondary side line current waveform schematic diagram when Fig. 3 is no controllable afterflow branch road and rectifier locking
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
As shown in Figure 1, magnetic control type paralleling reactor controllable afterflow of the present invention props up the route thyristor valve and is connected in parallel on dc bus the two poles of the earth formation.The negative electrode of thyristor valve connects the positive pole of dc bus, and anode connects the negative pole of dc bus.
The method of controllable afterflow of the present invention comprises: 1, when rectifier is in normal operating conditions, and the pulse of locking controllable afterflow branch road thyristor valve trigger, the not conducting of controllable afterflow branch road; 2, when transmission line generation open-phase operation or three-phase tripping operation, control circuit (belonging to existing mature technology) locking rectifier trigger pulse triggers controllable afterflow branch road thyristor valve simultaneously.Its principle is summarized as follows:
1, when the rectifier operate as normal, the thyristor valve of controllable afterflow branch road is not open-minded, and DC excitation electric current I L constitutes the loop by rectifier and field excitation branch line, does not contain DC component in the rectifier transformer secondary side line electric current, and current waveform as shown in Figure 2.
2, when transmission line generation open-phase operation or three-phase tripping operation, control circuit locking rectifier trigger pulse, and the thyristor valve of continuous trigger controllable afterflow branch road, the controllable afterflow branch road will be at rectifier output voltage instantaneous value u
dConducting in≤0 o'clock, DC excitation electric current I L is transferred to the controllable afterflow branch road from rectifier and constitutes the loop, and the rectifier thyristor valve all turn-offs simultaneously, for the closure of contactor in parallel has been created condition.
If there is not the controllable afterflow branch road, during the locking rectifier trigger pulse, DC excitation electric current I L still constitutes the loop by field excitation branch line, rectifier and rectifier transformer, and the DC excitation electric current is decayed according to index law.Because rectifier load is strong inductive load, time constant is big, and the thyristor valve of rectifier can not turn-off rapidly, and rectifier transformer secondary side one phase current is zero, two phase flow is crossed equal and opposite in direction in addition, direction is opposite and be the direct current that index law is decayed, and current waveform as shown in Figure 3.If with the thyristor of diode replacement afterflow branch road, then rectifier output voltage instantaneous value u
d〉=0, rectifier not only can not work in inverter mode, and the rectifier output voltage average value also can be much larger than 0 (should be 0 during operate as normal) during in α=90 °, thereby has influenced the normal operation of excitation system.
Can see according to foregoing, the controllable branch path afterflow method that the present invention adopts, the DC excitation electric current not only can be transferred to the afterflow branch road reliably, apace from rectifier, thereby realize the effective locking of rectifier, finally create conditions for the closure of contactor in parallel; And rectifier can be operated in inverter mode, and rapid release DC loop energy does not influence safety, the reliability service of excitation system.
Claims (1)
1. magnetic control type paralleling reactor controllable afterflow method, it may further comprise the steps:
1) be provided with one in the magnetic control type paralleling reactor field excitation system and be connected in parallel on the controllable afterflow branch road that dc bus the two poles of the earth constitute by thyristor valve, the negative electrode of described thyristor valve connects the positive pole of dc bus, and anode connects the negative pole of dc bus;
2) when rectifier is in normal operating conditions, the DC excitation electric current constitutes loop, the not conducting of thyristor valve of controllable afterflow branch road by rectifier and field excitation branch line;
3) when transmission line generation open-phase operation or three-phase tripping operation, control circuit locking rectifier trigger pulse, trigger the thyristor valve of controllable afterflow branch road simultaneously, the conducting of controllable afterflow branch road, the DC excitation electric current is transferred to the controllable afterflow branch road from rectifier and constitutes the loop, and the thyristor valve of rectifier all turn-offs simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810105711XA CN101345508B (en) | 2008-04-30 | 2008-04-30 | Controllable afterflow method of magnetic controlled shunt reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810105711XA CN101345508B (en) | 2008-04-30 | 2008-04-30 | Controllable afterflow method of magnetic controlled shunt reactor |
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| Publication Number | Publication Date |
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| CN101345508A CN101345508A (en) | 2009-01-14 |
| CN101345508B true CN101345508B (en) | 2011-05-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104601067A (en) * | 2014-12-26 | 2015-05-06 | 国家电网公司 | Excitation control method of magnetic controlled type controllable parallel reactor with quick adjusting function |
| CN104811052A (en) * | 2015-04-24 | 2015-07-29 | 国家电网公司 | Alternating voltage and current controller and magnetically controlled reactor as well as working methods thereof |
| CN107395034A (en) * | 2017-09-09 | 2017-11-24 | 孙崇山 | From commutation rectification circuit and idle method for transformation |
| CN107395033A (en) * | 2017-09-09 | 2017-11-24 | 孙崇山 | Novel rectifying circuit and idle method for transformation |
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Owner name: STATE ELECTRIC NET CROP. Effective date: 20130130 |
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Effective date of registration: 20130130 Address after: 100192 Beijing city small business Qinghe Road No. 15 Patentee after: China Electric Power Research Institute Patentee after: State Grid Corporation of China Address before: 100192 Beijing city small business Qinghe Road No. 15 Patentee before: China Electric Power Research Institute |
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| CB03 | Change of inventor or designer information |
Inventor after: Deng Zhanfeng Inventor after: Yang Tong Inventor after: Qiu Yufeng Inventor after: Cui Dawei Inventor after: Zhou Fei Inventor after: Lei Xi Inventor after: Wang Xuan Inventor after: Xu Guizhi Inventor after: Wang Yuhong Inventor after: Zhang Zhenhuan Inventor before: Deng Zhanfeng Inventor before: Cui Dawei Inventor before: Zhou Fei Inventor before: Lei Xi Inventor before: Wang Xuan |
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