CN104699160A - Voltage stabilization control system for direct-current high-voltage test power source - Google Patents
Voltage stabilization control system for direct-current high-voltage test power source Download PDFInfo
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Abstract
The invention discloses a voltage stabilization control system for a direct-current high-voltage test power source. The voltage stabilization control system comprises a voltage regulator, a bidirectional thyristor, a high-voltage boosting transformer, a rectifying device, a voltage divider, a voltage-current detection device and a voltage regulation and stabilization device. An input end of the voltage regulator is connected with an external power source, one output end of the voltage regulator is outputted to a test object sequentially through the bidirectional thyristor, the high-voltage boosting transformer and the rectifying device, the voltage divider is parallelly connected with the test object, and the voltage-current detection device is connected with the voltage divider. A feedback voltage output end of the voltage-current detection device is connected with a feedback voltage input end of the voltage regulation and stabilization device, the other output end of the voltage regulator is connected with a reference voltage input end of the voltage regulation and stabilization device, and an output end of the voltage regulation and stabilization device is connected with a control end of the bidirectional thyristor. The voltage stabilization control system for the direct-current high-voltage test power source has the advantages of effectiveness in restraining of output ripples, automation in correction of controlled deviations, quickness in response, high voltage stability, high disturbance resistance, structural stability and reliability, simplicity and convenience in operation and simplicity in maintenance.
Description
Technical field
The present invention relates to electrical engineering technical field, be specifically related to a kind of DC high potential test power supply voltage-stabilization control system.
Background technology
Equipment performance and voltage have direct relation, and the variation of voltage can affect the stable of equipment performance or the parameter exported.In actual applications, requirement is regardless of communication power supply or how pull-up resistor changes, and the VD of stable-pressure device all keeps stable.The quality of voltage-stabilization control system and ripple factor, response speed, voltage-regulation coefficient is relevant.
When carrying out artificial direct current pollution test, the output voltage of experiment power supply will remain unchanged from start to finish.But the leakage current of Criterion of Polluted Insulator has the features such as duration length, fluctuation and amplitude are large, and leakage current certainly will cause fluctuating widely of electric power output voltage, the followability of test control system and vulnerability to jamming.Particularly because insulator surface electric discharge causes load to discharge the relative voltage overshoot caused, if control not rapid, then may cause flashover, affect test findings.At present, both at home and abroad the research of the direct current pollution test power supply taking thyristor as main pressure regulation device is made certain gains.Propose to adopt thyristor FEEDBACK CONTROL to have positive effect to the dynamic pressure drop reducing direct supply, control system adopts pure hardware to form, but is not easy to operation and maintenance.Also have a kind of design based on the pollution test power supply of thyristor and carried out open loop research.But compared with closed-loop control, opened loop control can not the departing from of auto modification controlled volume, and performance of noiseproof is poor.
Summary of the invention
The technical problem to be solved in the present invention is: for the problems referred to above of prior art, there is provided one effectively can suppress the controlled bias of output ripple, auto modification, fast response time, voltage-regulation coefficient is high, the DC high potential test power supply voltage-stabilization control system that Immunity Performance is strong.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of DC high potential test power supply voltage-stabilization control system, comprise pressure regulator, bidirectional triode thyristor, H.V. step up transformer, fairing, voltage divider, voltage and current detecting device and voltage-regulating and voltage-stabilizing device, the input end of described pressure regulator is connected with external power source, one road output terminal of described pressure regulator passes through bidirectional triode thyristor successively, H.V. step up transformer, test specimen exported to by fairing, described voltage divider and test specimen are connected in parallel, described voltage and current detecting device is connected with voltage divider, the feedback voltage output terminal of described voltage and current detecting device is connected with the feedback voltage input end of voltage-regulating and voltage-stabilizing device, another road output terminal of described pressure regulator is connected with the reference voltage input of voltage-regulating and voltage-stabilizing device, the output terminal of described voltage-regulating and voltage-stabilizing device is connected with the control end of bidirectional triode thyristor.
Preferably, the input end of described voltage-regulating and voltage-stabilizing device is provided with photoisolator, and the voltage and current output terminal of described voltage and current detecting device is connected with the input end of voltage-regulating and voltage-stabilizing device respectively by photoisolator.
Preferably, described voltage-regulating and voltage-stabilizing device is thyristor voltage regulator.
Preferably, described voltage divider is direct current RC divider.
Preferably, described pressure regulator is 10KV column type voltage regulator.
DC high potential test power supply voltage-stabilization control system of the present invention has following advantage: a road output terminal of the pressure regulator of DC high potential test power supply voltage-stabilization control system of the present invention successively with bidirectional triode thyristor, H.V. step up transformer, fairing is connected, fairing respectively with one end of voltage divider, one end of test specimen is connected, pressure regulator, bidirectional triode thyristor, H.V. step up transformer, fairing forms voltage multiplying rectifier circuit, output voltage is up to ± 1000kV, output current 1A, and adopt fairing rapid translating polarity, exportable positive polarity or negative polarity d. c voltage, and adopt perfect voltage-regulating and voltage-stabilizing device to realize DC high voltage test full process automatization and intellectuality, the voltage and current output terminal of voltage and current detecting device is connected with the input end of voltage-regulating and voltage-stabilizing device respectively, another road output terminal of pressure regulator is connected with the reference voltage input of voltage-regulating and voltage-stabilizing device, the output terminal of voltage-regulating and voltage-stabilizing device is connected with the control end of bidirectional triode thyristor, voltage-regulating and voltage-stabilizing device realizes the control to bidirectional triode thyristor based on the principle of closed-loop control, effectively can suppress output ripple, and can the controlled bias of auto modification, there is fast response time, voltage-regulation coefficient is high, the advantage that Immunity Performance is strong, Stability Analysis of Structures is reliable, easy and simple to handle, automaticity is high and maintenance is simple.
Accompanying drawing explanation
Fig. 1 is the framed structure schematic diagram of the embodiment of the present invention.
Marginal data: 1, pressure regulator; 2, bidirectional triode thyristor; 3, H.V. step up transformer; 4, fairing; 5, voltage divider; 6, voltage and current detecting device; 7, voltage-regulating and voltage-stabilizing device; 71, photoisolator; 8, test specimen.
Embodiment
As shown in Figure 1, the DC high potential test power supply voltage-stabilization control system of the present embodiment comprises pressure regulator 1, bidirectional triode thyristor 2, H.V. step up transformer 3, fairing 4, voltage divider 5, voltage and current detecting device 6 and voltage-regulating and voltage-stabilizing device 7, the input end of pressure regulator 1 is connected with external power source, one road output terminal of pressure regulator 1 successively with bidirectional triode thyristor 2, H.V. step up transformer 3, fairing 4 is connected, fairing 4 respectively with one end of voltage divider 5, one end of test specimen 8 is connected, the voltage acquisition input end of voltage and current detecting device 6 is connected with the other end of voltage divider 5, the current acquisition input end of voltage and current detecting device 6 is connected with the other end of test specimen 8, the voltage and current output terminal of voltage and current detecting device 6 is connected with the input end of voltage-regulating and voltage-stabilizing device 7 respectively, another road output terminal of pressure regulator 1 is connected with the reference voltage input of voltage-regulating and voltage-stabilizing device 7, the output terminal of voltage-regulating and voltage-stabilizing device 7 is connected with the control end of bidirectional triode thyristor 2.In the present embodiment, pressure regulator 1 adopts commercially available AC 10kV column type voltage regulator, bidirectional triode thyristor 2 adopts commercially available bidirectional high-pressure thyristor stack (composition element), H.V. step up transformer 3 adopts the step-up transformer of commercially available 3200kVA/800kV power frequency pollution test transformer set of equipments, fairing 4 adopts commercially available filter capacitor and voltage doubling capacitor to realize, in addition the voltage and current detecting device 6 in the present embodiment and voltage-regulating and voltage-stabilizing device 7 are also commercially available product, voltage and current detecting device 6 is for gathering the voltage of voltage divider 5, the electric current of test specimen 8, voltage-regulating and voltage-stabilizing device 7 is commercially available thyristor voltage regulator, for controlling bidirectional triode thyristor 2 according to the voltage and current fed back and reference voltage.
In the present embodiment, the input end of voltage-regulating and voltage-stabilizing device 7 is provided with photoisolator 71, and the voltage and current output terminal of voltage and current detecting device 6 is connected respectively by the input end of photoisolator 71 with voltage-regulating and voltage-stabilizing device 7.Photoisolator 71 is adopted to realize signal one-way transmission, make to fully achieve electrical isolation between the voltage and current output terminal of the input end of voltage-regulating and voltage-stabilizing device 7, voltage and current detecting device 6, the noiseless impact of the input end of output signal on voltage-regulating and voltage-stabilizing device 7, the antijamming capability of the voltage and current output terminal of voltage and current detecting device 6 are strong, there is working stability, contactless, long service life, the advantage that transfer efficiency is high.In the present embodiment, photoisolator 71 adopts commercially available photoisolator.In the present embodiment, voltage divider 5 is direct current RC divider, and the commercially available 1000kV direct current RC divider of concrete employing, measures the voltage of test specimen 8 by direct current RC divider, its measure linear degree and accuracy be not more than ± and 1%, therefore voltage detecting is more accurately and reliably.
The principle of work of the present embodiment DC high potential test power supply voltage-stabilization control system is as follows: in working order, after the 10kV voltage regulation of electric power sources that input end inputs by pressure regulator 1, boosted by H.V. step up transformer 3 after bidirectional triode thyristor 2, export on test specimen 8 after fairing 4 rectification.When there is the fluctuation of load in test specimen 8 (such as test specimen 8 surface occur shelf depreciation cause comparatively gross leak electric current time), voltage divider 5 acquires the feedback voltage level of test specimen 8, voltage and current detecting device 6 detects the feedback voltage level of voltage divider 5, the feedback voltage detected is sent into voltage-regulating and voltage-stabilizing device 7, and the reference voltage of output is together sent into voltage-regulating and voltage-stabilizing device 7 by pressure regulator 1 simultaneously.Because amplifier open-loop gain is very high, and the reference voltage in the present embodiment obtains after pressure regulator 1 pressure regulation, so the present embodiment passes through bidirectional thyristor for regulating voltage circuit based on the voltage after pressure regulator 1 pressure regulation as reference voltage, make the circuit precision of voltage regulation higher, the change of direct supply dynamic pressure drop can be reduced, thus realize exporting the stable of DC voltage (on test specimen 8 voltage).
In the present embodiment, the pressure regulation process of bidirectional thyristor for regulating voltage circuit is as follows: the two-way magnitude of voltage of input carries out sending corresponding trigger pip to bidirectional triode thyristor 2 after operation amplifier obtains difference by voltage-regulating and voltage-stabilizing device 7, controls the conduction angle change of bidirectional triode thyristor 2; When output voltage departs from reference voltage rising, bidirectional triode thyristor 2 delayed trigger, pilot angle increases, conduction angle reduces; When output voltage departs from reference voltage decline, bidirectional triode thyristor 2 shifts to an earlier date triggering and conducting, and pilot angle reduces, conduction angle increases, thus makes the output voltage of bidirectional triode thyristor 2 constant; Simultaneously, the voltage that voltage-regulating and voltage-stabilizing device 7 exports according to the Current Control bidirectional triode thyristor 2 of input, when the electric current of input is excessive, then can determine that the output voltage of bidirectional triode thyristor 2 is less than normal, therefore the output voltage of bidirectional triode thyristor 2 should be increased, if the electric current of contrary input is too small, then can determine that the output voltage of bidirectional triode thyristor 2 is bigger than normal, therefore should reduce the output voltage of bidirectional triode thyristor 2.What needs were said is, the above-mentioned closed-loop control of bidirectional thyristor for regulating voltage circuit is only a kind of close-loop control mode example implemented on the basis of the DC high potential test power supply voltage-stabilization control system of the present embodiment, certainly also can adopt the existing conventional control mode of current bidirectional thyristor for regulating voltage circuit or other control modes improved as required, the DC high potential test power supply voltage-stabilization control system of the present embodiment is as the hardware platform providing closed control circuit structure, and its realization does not rely on a certain specific close-loop control mode.
The above is only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a DC high potential test power supply voltage-stabilization control system, it is characterized in that: comprise pressure regulator (1), bidirectional triode thyristor (2), H.V. step up transformer (3), fairing (4), voltage divider (5), voltage and current detecting device (6) and voltage-regulating and voltage-stabilizing device (7), the input end of described pressure regulator (1) is connected with external power source, one road output terminal of described pressure regulator (1) is successively by bidirectional triode thyristor (2), H.V. step up transformer (3), test specimen (8) exported to by fairing (4), described voltage divider (5) and test specimen (8) are connected in parallel, described voltage and current detecting device (6) is connected with voltage divider (5), the feedback voltage output terminal of described voltage and current detecting device (6) is connected with the feedback voltage input end of voltage-regulating and voltage-stabilizing device (7), another road output terminal of described pressure regulator (1) is connected with the reference voltage input of voltage-regulating and voltage-stabilizing device (7), the output terminal of described voltage-regulating and voltage-stabilizing device (7) is connected with the control end of bidirectional triode thyristor (2).
2. DC high potential test power supply voltage-stabilization control system according to claim 1, it is characterized in that: the input end of described voltage-regulating and voltage-stabilizing device (7) is provided with photoisolator (71), the voltage and current output terminal of described voltage and current detecting device (6) is connected respectively by the input end of photoisolator (71) with voltage-regulating and voltage-stabilizing device (7).
3. DC high potential test power supply voltage-stabilization control system according to claim 2, is characterized in that: described voltage-regulating and voltage-stabilizing device (7) is thyristor voltage regulator.
4. DC high potential test power supply voltage-stabilization control system according to claim 3, is characterized in that: described voltage divider (5) is direct current RC divider.
5. DC high potential test power supply voltage-stabilization control system according to claim 4, is characterized in that: described pressure regulator (1) is 10KV column type voltage regulator.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552521A (en) * | 2021-06-22 | 2021-10-26 | 中国电力科学研究院有限公司 | Method and system for determining linearity parameter of impulse voltage divider |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013329A (en) * | 2006-04-12 | 2007-08-08 | 中国科学院上海光学精密机械研究所 | Constant-current high-voltage direct-current power supply |
| CN204480098U (en) * | 2015-03-27 | 2015-07-15 | 国家电网公司 | A kind of DC high potential test power supply voltage-stabilization control system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013329A (en) * | 2006-04-12 | 2007-08-08 | 中国科学院上海光学精密机械研究所 | Constant-current high-voltage direct-current power supply |
| CN204480098U (en) * | 2015-03-27 | 2015-07-15 | 国家电网公司 | A kind of DC high potential test power supply voltage-stabilization control system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552521A (en) * | 2021-06-22 | 2021-10-26 | 中国电力科学研究院有限公司 | Method and system for determining linearity parameter of impulse voltage divider |
| CN113552521B (en) * | 2021-06-22 | 2024-02-13 | 中国电力科学研究院有限公司 | Method and system for determining linearity parameters of impulse voltage divider |
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