CN202917950U - Novel power transformer control system with direct current magnetic bias compensation function - Google Patents
Novel power transformer control system with direct current magnetic bias compensation function Download PDFInfo
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- CN202917950U CN202917950U CN 201220630963 CN201220630963U CN202917950U CN 202917950 U CN202917950 U CN 202917950U CN 201220630963 CN201220630963 CN 201220630963 CN 201220630963 U CN201220630963 U CN 201220630963U CN 202917950 U CN202917950 U CN 202917950U
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Abstract
The utility model relates to a novel power transformer control system with a direct current magnetic bias compensation function. The novel power transformer control system includes a reactor, a PWM controlled rectifier, a single-phase inverter, a capacitor, a positive magnetizing control contactor, a negative magnetizing control contactor, a demagnetization control contactor and a CPU which are connected with a power grid, wherein the PWM controlled rectifier, the single-phase inverter, the positive magnetizing control contactor, the negative magnetizing control contactor and the demagnetization control contactor are all connected with the CPU. According to the system, a conversion function of magnetic properties of a two-phase magnetic material is utilized, so that a transformer itself has a capacity of inhibiting direct current magnetic bias. The novel power transformer control system can assist in eliminating the defects caused by traditional methods for inhibiting direct current magnetic bias, ensuring reliable earthing of a neutral point of the transformer, and improving the reliability and safety of the operation of the power grid and the transformer; and the novel power transformer control system is of great practical significance for a whole power system.
Description
Technical field
The utility model relates to field of power electronics, be particularly related to a kind of novel electric power transformer control system with D.C. magnetic biasing compensate function to suppress the D.C. magnetic biasing of transformer, this device also can be used to realize the magnetic characteristic conversion of two-phase magnetic material, semi-hard magnetic alloy and be applied in the controlled reactor simultaneously.
Background technology
Along with power electronic technology, developing rapidly of computer technology and control theory is gradually improved high voltage dc transmission technology.Be connected the aspects such as asynchronous connection with AC system at high-power long distance power transmission, submarine cable, direct current transportation has the superiority of many uniquenesses.Low by 1996, the DC engineering that has put into operation in the world just has 56, and transmission line capability reaches 54.166GW.Along with the electric power development general policy of China's " transferring electricity from the west to the east, north and south is confession mutually, national network ", HVDC Transmission Technology will play an important role in nationwide integrated power grid is interconnected.At present direct current transportation has obtained significant progress and application in China, China is from the Zhoushan 100KV submarine cable direct current transportation of building up voluntarily, so far successively to build up Three Gorges to Changzhou 500KV DC transmission engineering, day wide 500KV DC transmission engineering, expensive wide 500KV DC transmission engineering.Direct current transportation is to have very large economic benefit under certain condition.Yet find in actual motion, when DC transmission system adopted the earth as the operational mode in loop, huge direct current consisted of the loop with the earth, can near AC system be exerted an influence when flowing through from the earth.Its impact on AC system mainly is caused by near the transformer DC magnetic bias of the neutral-point solid ground earth electrode.
In high voltage direct current transmission, circuit generally all adopts the mode of one pole ground return circuit to move, for example a day wide power transmission network adopts this operational mode exactly, during the operation of direct current one pole ground return circuit, the part AC transformer can be subject to the impact of D.C. magnetic biasing, and meeting is so that the vibration of electrical network some transformers aggravates, and noise increases, the exciting current distortion, similar incidents occurred always after three wide DC power transmission line put into operation.In expensive wide DC line, the monitoring record in May, 2004 shows, under the expensive wide DC power transmission line one pole ground return circuit operational mode, spring city station owner's transformer neutral point DC current reaches 34.5A, and noise reaches 93.9dB, and harmonic voltage resultant distortion rate reaches 2.1%.Three Gorges dragon's fountain---the flat 500kV DC transmission system of Jiangsu political affairs is since in December, 2002 debugging and trial run, and noise significantly rise (rising 20dB) all appears in two groups of 500KVA main transformers of Changzhou Wu Nan transformer station.
In addition, except high voltage direct current transmission project can cause the DC magnetic bias phenomena, the earth magnetism magnetic storm equally also can cause the D.C. magnetic biasing of transformer.Can be found out by document, cause the in addition geomagnetic induction current (GIC) of power transformer D.C. magnetic biasing.When geomagnetic storm occured, the magnetic field that electrode current produces and magnetic field of the earth interacted and produce at the earth's surface;on the face of the globe induced potential (ESP), and this induced potential can reach every kilometer 1～10V or higher.This ground potential will in long-distance transmission system, particularly be brought out geomagnetic induction current between the grounding transformer in the east-west transmission line.This faradic frequency is compared to be similar to the 50Hz power frequency of AC system and is regarded direct current as between 0.001 ~ 0.1Hz.
On March 13rd, 1989; the bias current that magnetic storm causes has caused having a power failure on a large scale of Quebec, CAN electrical network; cause is that bias current makes transformer core sharply saturated; harmonic wave increases; cause the protective relaying maloperation of electrical network SVC device to be done, a large amount of capacitors are out of service, the system voltage collapse; finally lose the 9500MW load, nearly 9 hours of grid disconnection.Therefore, inhibition method and the measure of the DC magnetic bias phenomena of research transformer are that thing must gone to safe operation of power system.
In electrical network, a lot of transformers all can be subject to the impact of DC magnetic bias current, and affected transformer has plenty of near the converter direct current grounding pole, and what have but is away from direct current grounding pole, and what also have but is in east-west transmission line.But any is arranged is sure, that be exactly the transformer DC magnetic bias phenomenon be to be caused by the direct current that flows into its neutral point.Direct current produces potential difference between two grounding transformers, electric current is flowed into by a transformer grounding neutral point, flows out from another transformer neutral point.The direct current that flows through Transformer Winding causes that the magnetic bias of transformer causes transformer core saturated, and the exciting current distortion produces a large amount of harmonic waves, and reactive loss increases, even may cause that also system voltage seriously reduces, system relay misoperation etc.So the inhibition of researching DC magnetic bias is imperative.
At present, cause that corresponding to the earth DC potential inhibition method that D.C. magnetic biasing is taked mainly contains four kinds: neutral point string small resistor method, electric capacity are every straight method, potential compensation method and direct current inverse injection method.
But all there is certain problem in the whole bag of tricks.Small resistor current limliting method can't be eliminated neutral point direct current fully, sometimes has to adopt the resistance of larger resistance, and this might affect main transformer neutral point insulation intensity; Although electric capacity can be eliminated neutral point direct current preferably every straight method, affects the effective grounding of transformer, higher to main transformer neutral point insulation requirement of strength, reply short circuit malfunction ability is relatively poor; Neutral point injects the reverse current lambda limiting process need to build the compensation of ground utmost point in addition, and choosing of compensation earth polar is extremely difficult.And at the remote conveying electric system, the efficient of offset current will reduce, and the power of dc generator will double, and the earth mat burden has also been increased the weight of in large electric inflow place, accelerate ground net corrosion, and application cost is high; Potential compensation method power consumption is large, and device is expensive, and choosing of compensation earth polar is also difficult.
Therefore, a kind of novel electric power transformer control system with D.C. magnetic biasing compensate function that the utility model proposes, can make the remarkable advantage of the novel electric power transformer with D.C. magnetic biasing compensate function (from the angle that self designs, set up effective structural system in transformer inside, realize suppressing transformer DC magnetic bias, do not change the connection of power transformer external circuit (particularly neutral point)) be achieved.The D.C. magnetic biasing problem might be fundamentally solved, and the transformer safe operation can be guaranteed.
Summary of the invention
Goal of the invention:
The utility model provides a kind of novel electric power transformer control system with D.C. magnetic biasing compensate function, be used for realizing the conversion of two-phase magnetic material, this function is used for having the novel electric power transformer of D.C. magnetic biasing compensate function, purpose is to suppress transformer DC magnetic bias.
Technical scheme: the utility model is implemented by the following technical programs:
Novel electric power transformer control system with D.C. magnetic biasing compensate function, be connected with the novel electric power transformer with D.C. magnetic biasing compensate function, it is characterized in that: described system is mainly by the reactor that is connected with electrical network, the PWM controlled rectifier, single-phase inverter, electric capacity, the forward control contactor that magnetizes, control contactor oppositely magnetizes, the demagnetization control contactor connects and composes successively, the PWM controlled rectifier connects single-phase inverter, magnetize control contactor and the control contactor that oppositely magnetizes of forward connects the PWM controlled rectifier, and the demagnetization control contactor connects single-phase inverter; PWM controlled rectifier, single-phase inverter, forward magnetize control contactor, oppositely magnetize control contactor, the demagnetization control contactor all be connected with CPU; Have and be provided with two-phase magnetic material, control winding and Hall current sensor in the novel electric power transformer of D.C. magnetic biasing compensate function, the two-phase magnetic material is wound on the control winding and with control system and links to each other, and Hall current sensor is connected with CPU.
The PWM controlled rectifier is to be connected to form by the three-phase bridge that an IGBT and the first fly-wheel diode consist of.
Single-phase inverter is to be connected to form by the single-phase bridge that the 2nd IGBT and the second fly-wheel diode consist of.
Advantage and effect:
The utility model can be realized the translation function of two-phase magnetic material magnetic characteristic, this function can effectively be suppressed D.C. magnetic biasing for the novel electric power transformer with D.C. magnetic biasing compensate function, overcome the deficiency that traditional inhibition D.C. magnetic biasing method is brought, guaranteed the reliable ground of transformer neutral point, improved the reliability of power network and transformer safe operation, power savings is obvious, and whole electric power system is had great practical significance.
Description of drawings:
Fig. 1 is structural representation of the present utility model.
Description of reference numerals:
1, electrical network, 2, reactor, 3, the PWM controlled rectifier, 4, IGBT, 5, fly-wheel diode, 6, single-phase inverter, 7, IGBT, 8, fly-wheel diode, 9, electric capacity, 10, the forward control contactor that magnetizes, 11, the reverse control contactor that magnetizes, 12, the demagnetization control contactor, 13, CPU, 14, the two-phase magnetic material, 15, the control winding, 16, Hall current sensor, 17, have a novel electric power transformer of D.C. magnetic biasing compensate function.
Embodiment:
Below in conjunction with accompanying drawing the utility model is specifically described:
The utility model is a kind of novel electric power transformer control system with D.C. magnetic biasing compensate function, as shown in fig. 1, is connected with the novel electric power transformer 17 with D.C. magnetic biasing compensate function, it is characterized in that:
Described system is mainly by the reactor 2 that is connected with electrical network 1, PWM controlled rectifier 3, single-phase inverter 6, electric capacity 9, forward magnetize control contactor 10, the reverse control contactor 11 that magnetizes, demagnetization control contactor 12 connects and composes successively, PWM controlled rectifier 3 connects single-phase inverter 6, magnetize control contactor 10 and the control contactor 11 that oppositely magnetizes of forward connects PWM controlled rectifiers 3, and demagnetization control contactor 12 connects single-phase inverters 6; PWM controlled rectifier 3, single-phase inverter 6, forward magnetize control contactor 10, oppositely magnetize control contactor 11, the demagnetization control contactor 12 all be connected with CPU13; Have and be provided with two-phase magnetic material 14, control winding 15 and Hall current sensor 16 in the novel electric power transformer 17 of D.C. magnetic biasing compensate function, two-phase magnetic material 14 is wound on the control winding 15 and with control system and links to each other, and Hall current sensor 16 is connected with CPU13.
PWM controlled rectifier 3 is to be connected to form by the three-phase bridge that an IGBT 4 and the first fly-wheel diode 5 consist of.
Single-phase inverter 6 is to be connected to form by the single-phase bridge that the 2nd IGBT 7 and the second fly-wheel diode 8 consist of.
This control system can realize the characteristic conversion of two-phase magnetic material 14, the i.e. conversion of magnetic property and soft magnetic characteristic.Two-phase magnetic material 14 begins to present soft magnetic characteristic, when two-phase magnetic material 14 need to carry out the magnetic characteristic conversion, sends high-frequency pulse signal by control system, and two-phase magnetic material 14 is magnetized, and two-phase magnetic material 14 can present magnetic property; In like manner, when two-phase magnetic material 14 was demagnetized processing, two-phase magnetic material 14 can return to again initial condition and present soft magnetic characteristic.
When the novel electric power transformer control system with D.C. magnetic biasing compensate function is used for having the novel electric power transformer 17 of D.C. magnetic biasing compensate function, when D.C. magnetic biasing occurs in the novel electric power transformer 17 with D.C. magnetic biasing compensate function, because bias current changes the transformer core magnetic flux, detect by 16 pairs of bias currents of Hall current sensor (magnetic flux), the signal that detects is sent into CPU13, CPU13 control forward magnetize control contactor 10 or control contactor 11 adhesives of oppositely magnetizing, control simultaneously PWM controlled rectifier 3 and produce direct voltage, direct voltage produces offset current (magnetic flux) by control winding 15, this magnetic flux and magnetic bias magnetic flux equal and opposite in direction, opposite direction.At last, magnetize control contactor 10 or the control contactor 11 that oppositely magnetizes of CPU 13 control forwards disconnects, controlling simultaneously PWM controlled rectifier 3 quits work, and then reach the outage novel electric power transformer 17 with D.C. magnetic biasing compensate function is carried out the inhibition of D.C. magnetic biasing, finished detection and elimination to the transformer DC magnetic bias phenomenon.Energy-saving effect is remarkable; When D.C. magnetic biasing disappears, detection by 16 pairs of exciting currents of Hall current sensor, the signal that detects is sent into CPU 13,12 adhesives of CPU 13 control demagnetization control contactors, and control single-phase inverter 6 produces alternating voltage, alternating voltage produces demagnetization currents (magnetic flux) by control winding 15, and then the conversion that two-phase magnetic material 14 is carried out from the Hard Magnetic characteristic to soft magnetic characteristic.After two-phase magnetic material 14 was characterized by soft magnetic characteristic, CPU 13 control demagnetization control contactors 12 disconnected, and single-phase inverter 6 quits work, and finishes the whole course of work.
This novel electric power transformer control system with D.C. magnetic biasing compensate function of the utility model has utilized the function to the conversion of two-phase magnetic material magnetic characteristic, makes transformer self have the ability that suppresses D.C. magnetic biasing.Overcome the deficiency that traditional inhibition D.C. magnetic biasing method is brought, guaranteed the reliable ground of transformer neutral point, improved the reliability of power network and transformer safe operation, whole electric power system has been had great practical significance.
Claims (3)
1. the novel electric power transformer control system that has the D.C. magnetic biasing compensate function, be connected with the novel electric power transformer (17) with D.C. magnetic biasing compensate function, it is characterized in that: described system is mainly by the reactor (2) that is connected with electrical network (1), PWM controlled rectifier (3), single-phase inverter (6), electric capacity (9), the forward control contactor (10) that magnetizes, control contactor (11) oppositely magnetizes, demagnetization control contactor (12) connects and composes successively, PWM controlled rectifier (3) connects single-phase inverter (6), magnetize control contactor (10) and the control contactor (11) that oppositely magnetizes of forward connects PWM controlled rectifier (3), and demagnetization control contactor (12) connects single-phase inverter (6); PWM controlled rectifier (3), single-phase inverter (6), forward magnetize control contactor (10), oppositely magnetize control contactor (11), demagnetization control contactor (12) all and CPU(13) be connected; Have and be provided with two-phase magnetic material (14), control winding (15) and Hall current sensor (16) in the novel electric power transformer (17) of D.C. magnetic biasing compensate function, two-phase magnetic material (14) is wound on control winding (15) and upward and with control system links to each other Hall current sensor (16) and CPU(13) be connected.
2. the novel electric power transformer control system with D.C. magnetic biasing compensate function according to claim 1, it is characterized in that: PWM controlled rectifier (3) is by an IGBT(4) three-phase bridge that consists of with the first fly-wheel diode (5) connects to form.
3. the novel electric power transformer control system with D.C. magnetic biasing compensate function according to claim 1, it is characterized in that: single-phase inverter (6) is by the 2nd IGBT(7) single-phase bridge that consists of with the second fly-wheel diode (8) connects to form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220630963 CN202917950U (en) | 2012-11-26 | 2012-11-26 | Novel power transformer control system with direct current magnetic bias compensation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220630963 CN202917950U (en) | 2012-11-26 | 2012-11-26 | Novel power transformer control system with direct current magnetic bias compensation function |
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| Publication Number | Publication Date |
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| CN202917950U true CN202917950U (en) | 2013-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220630963 Expired - Fee Related CN202917950U (en) | 2012-11-26 | 2012-11-26 | Novel power transformer control system with direct current magnetic bias compensation function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983549A (en) * | 2012-11-26 | 2013-03-20 | 沈阳工业大学 | Novel power transformer control system having direct current magnetic biasing compensation function |
| EP4254446A1 (en) * | 2022-03-31 | 2023-10-04 | Hitachi Energy Switzerland AG | Transformer dc magnetization detection and mitigation through vibration measurement |
-
2012
- 2012-11-26 CN CN 201220630963 patent/CN202917950U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983549A (en) * | 2012-11-26 | 2013-03-20 | 沈阳工业大学 | Novel power transformer control system having direct current magnetic biasing compensation function |
| CN102983549B (en) * | 2012-11-26 | 2018-01-30 | 沈阳工业大学 | Novel electric power transformer control system with D.C. magnetic biasing compensation function |
| EP4254446A1 (en) * | 2022-03-31 | 2023-10-04 | Hitachi Energy Switzerland AG | Transformer dc magnetization detection and mitigation through vibration measurement |
| WO2023186497A1 (en) * | 2022-03-31 | 2023-10-05 | Hitachi Energy Switzerland Ag | Transformer dc magnetization detection and mitigation through vibration measurement |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CHINA DATANG GROUP SCIENCE AND TECHNOLOGY RESEARCH Effective date: 20130916 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130916 Address after: Shen Liaoning Road 110870 in Liaoning province Shenyang City Economic and Technological Development Zone No. 111 Patentee after: Shenyang University of Technology Patentee after: China Datang Group Science & Technology Research Institute Co., Ltd. Address before: Shen Liaoning Road 110870 in Liaoning province Shenyang City Economic and Technological Development Zone No. 111 Patentee before: Shenyang University of Technology |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130501 Termination date: 20161126 |
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| CF01 | Termination of patent right due to non-payment of annual fee |