CN101969195B - Transformer direct current magnetic bias compensation device with reactive power compensation function and control method - Google Patents
Transformer direct current magnetic bias compensation device with reactive power compensation function and control method Download PDFInfo
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- CN101969195B CN101969195B CN 201010518705 CN201010518705A CN101969195B CN 101969195 B CN101969195 B CN 101969195B CN 201010518705 CN201010518705 CN 201010518705 CN 201010518705 A CN201010518705 A CN 201010518705A CN 101969195 B CN101969195 B CN 101969195B
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Abstract
The invention relates to a transformer direct current magnetic bias compensation device with the reactive power compensation function and a control method, the device comprises a PWM rectifier connected with a power grid through a reactor, the PWM rectifier is connected with the direct current side in parallel as the alternating current side, and the direct current side, a transformer, a neutral wire Hall current sensor and a CPU are sequentially connected; PLL phase-locked loop circuits are respectively connected between the power grid and the CPU and between the reactor and the CPU; and the method can compensate the reactive power of the power grid through the alternating current side and suppress the direct current magnetic bias of a neutral point of the transformer through the direct current side. The device increases the structure for suppressing the direct current magnetic bias on the basis of static reactive power compensation and incorporates the study of the direct current magnetic bias suppression in a large power grid system for consideration, thereby not only suppressing the direct current magnetic bias, but also not affecting the normal operation of the power grid system, realizing the purpose of leading one device to realize two effects, reducing the cost of the device for suppressing the magnetic bias, obtaining certain economic benefits and having great practical significance for the whole power system.
Description
Technical field: the present invention relates to field of power electronics, specifically refer to a kind of device and control method thereof of improving power factor of electric network but also can suppressing the transformer neutral point D.C. magnetic biasing of not only can being used to.
Background technology: along with power electronic technology, developing rapidly of computer technology and control theory is gradually improved high voltage dc transmission technology.Asynchronous aspect such as be connected between high-power long distance power transmission, submarine cable and AC system, direct current transportation has many unique advantages.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 supplies mutually, national network ", the direct current transportation technology will play an important role in nationwide integrated power grid is interconnected.Direct current transportation has at present obtained significant progress and application in China; China begins 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 big economic benefit under certain condition.Yet find that in actual motion when DC transmission system adopted the earth as the operational mode in loop, huge direct current constituted the loop with the earth, can near AC system be exerted an influence when from the earth, flowing through.Its influence to 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, and 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 receive the influence of D.C. magnetic biasing, can make the vibration of electrical network interior section transformer aggravate, and noise increases; The exciting current distortion, similar incidents occurred always after three wide DC power transmission lines put into operation.In expensive wide DC line, the monitoring record in May, 2004 shows that under the expensive wide DC power transmission line one pole ground return circuit operational mode, spring city station owner's transformer neutral point direct current reaches 34.5A, and noise reaches 93.9dB, and harmonic voltage resultant distortion rate reaches 2.1%.The flat 500kV DC transmission system of Three Gorges dragon's fountain---Jiangsu political affairs is since in December, 2002 debugging and trial run, and noise rise significantly (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 D.C. magnetic biasing phenomenon, the earth magnetism magnetic storm equally also can cause the D.C. magnetic biasing of transformer.Can find out by document, cause the geomagnetic induction current (GIC) in addition of power transformer D.C. magnetic biasing.When geomagnetic storm took place, magnetic field that electrode current produces and magnetic field of the earth interacted and produce induced potential (ESP) at the earth's surface, and this induced potential can reach every kilometer 1～10V or higher.This ground potential will be brought out geomagnetic induction current between the grounding transformer in the particularly east-west transmission line in long-distance transmission system.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, and cause is that bias current makes transformer core sharply saturated; Harmonic wave heightens; 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, the inhibition method and the measure of the D.C. magnetic biasing phenomenon of research transformer are that thing must gone to safe operation of power system.
In electrical network, a lot of transformers all can receive the influence 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
[6], 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 cause 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 possibly cause that also system voltage seriously reduces, system relay misoperation or the like.So the inhibition of researching DC magnetic bias is imperative.
But only the inhibition of a researching DC magnetic bias is far from being enough; Should this problem be put into big network system considers; Not only suppressed D.C. magnetic biasing but also do not influenced network system normally to move; Perhaps can also do bigger contribution,, on the basis of SVC, increase the structure that suppresses D.C. magnetic biasing such as the present invention for network system.
In sum; D.C. magnetic biasing is that outer room is imposed on transformer, so not still with the inhibition of researching DC magnetic bias, also will restraining device be embedded in the static reacance power compensator; To reach two kinds of effect purposes of a device, this is to have great practical significance to electric power system.
Summary of the invention:
Goal of the invention: the present invention provides a kind of device, and the DC-DC converter that will be used to suppress D.C. magnetic biasing is connected in parallel on the PWM rectifier DC side that is used for static reactive, and purpose is to reduce the cost of the device that is used to suppress magnetic bias.
Technical scheme: the present invention implements through following technical scheme:
Have the transformer DC magnetic bias compensation arrangement of no-power compensation function, it is characterized in that: said device comprises the PWM rectifier that is connected through reactor with electrical network, and the PWM rectifier is to be connected to form by the three-phase commutation bridge that IGBT and fly-wheel diode constitute; The PWM rectifier is as the AC side and the DC side parallel of whole device; Wherein DC side comprises that electric capacity, resistance, DC-DC converter compose in parallel; Between resistance and DC-DC converter, insert diverter switch, wherein the DC-DC converter is connected to form by IGBT, fly-wheel diode; A circuit of DC-DC converter connects ground wire, and another link tester is crossed choke and is connected with transformer, and transformer is connected with CPU through neutral line Hall current sensor; Be connected through first PLL phase-locked loop circuit between electrical network and the CPU; Insert second PLL phase-locked loop circuit between reactor and the CPU.
DC side is composed in parallel by electric capacity, resistance, protective circuit, DC-DC converter, between protective circuit and resistance, inserts diverter switch; Wherein protective circuit is connected to form by resistance, IGBT, fly-wheel diode.
Control method with transformer DC magnetic bias compensation arrangement of no-power compensation function; It is characterized in that: said control method is for to compensate through the reactive power of AC side to electrical network; Suppress through the neutral point direct current magnetic bias of DC side to transformer, concrete grammar is:
When transformer generation D.C. magnetic biasing phenomenon, through the neutral line Hall current sensor detection signal is sent into CPU, the CPU control its switch is linked into DC side with the DC-DC converter then; Begin to produce DC power supply and suppress D.C. magnetic biasing, the PWM rectifier is in rectification state under the current state, can only be operated in three, four-quadrant; Wherein the PWM rectifier is equivalent to inductance when three quadrants; The PWM rectifier is equivalent to electric capacity when four-quadrant, not only can absorb active power but also can absorbing reactive power, and wherein active power is much larger than reactive power; When the needs potential compensation; The active power energy consumption increases, and detection signal feeds back to the control core CPU of reactive power compensation, and the DC-DC converter just can utilize this active power to suppress D.C. magnetic biasing; When transformer non DC bias phenomenon produces; Through the neutral line Hall current sensor detection signal is sent into CPU, the CPU control its switch is broken off, and the DC-DC converter is excised from DC side; This moment, the PWM rectifier was operated near under the pure electric capacity state, i.e. the negative semiaxis of Y axle;
Through first PLL phase-locked loop circuit, according to instantaneous reactive power theory, real component in the detection of grid and idle component; Draw the reactive current of required generation simultaneously; Again through second PLL phase-locked loop circuit sensed current signal, according to instantaneous reactive power theory, in conjunction with the resistance value of known reactor; Calculate the active current that potential compensation consumed; Produce the relative trigger pulse with above by first PLL phase-locked loop circuit, second two detection signal input CPU that the PLL phase-locked loop circuit is drawn, reach the double effects of reactive power compensation and potential compensation.
When transformer generation D.C. magnetic biasing phenomenon, through the neutral line Hall current sensor detection signal is sent into CPU, the CPU control its switch is linked into DC side with DC-DC converter, protective circuit then, begins to produce DC power supply and suppresses D.C. magnetic biasing; When transformer non DC bias phenomenon produces, through the neutral line Hall current sensor detection signal is sent into CPU, the CPU control its switch is broken off, and DC-DC converter, protective circuit are excised from DC side.
Advantage and effect: the present invention is through increasing the structure that suppresses D.C. magnetic biasing on the basis of static reactive; To put into big network system to the research that D.C. magnetic biasing suppresses and consider, both suppress D.C. magnetic biasing, not influence the normal operation of network system again; Realized the purpose of two kinds of effects of a device; Reduced the cost that suppresses the magnetic bias device, obtained certain economic benefits, whole electric power system has been had great practical significance.
Description of drawings:
Fig. 1 is a structural representation of the present invention;
Description of reference numerals:
1: electrical network, 2: reactor, 3: first PLL phase-locked loop circuit, 4:PWM rectifier, 5:IGBT, 6: DC side, 7: protective circuit, 8: diverter switch, 9: choke, 10:DC-DC converter, 11: transformer, 12: neutral line Hall current sensor, 13:CPU, 14: fly-wheel diode, 15: the second PLL phase-locked loop circuits.
Embodiment:
Below in conjunction with accompanying drawing the present invention is specified:
Fig. 1 is structural representation of the present invention, and is as shown in the figure, and electrical network 1 is connected with PWM rectifier 4 through reactor 2, and PWM rectifier 4 is to be connected to form by the three-phase commutation bridge that six IGBT5 and fly-wheel diode 14 constitute; PWM rectifier 4 is parallelly connected with DC side 6, here the AC side of PWM rectifier 4 as whole device; DC side 6 is composed in parallel by an electric capacity, resistance, protective circuit 7, a DC-DC converter 10 successively, between resistance and protection circuit 7, inserts diverter switch 8; Wherein protective circuit 7 is connected to form by resistance, IGBT5, fly-wheel diode 14, and DC-DC converter 10 is connected to form by four IGBT5, fly-wheel diode 14; A circuit of DC-DC converter 10 connects ground wire, and another link tester is crossed choke 9 and is connected with transformer 11, and transformer 11 is connected with CPU13 through neutral line Hall current sensor 12; Be connected through first PLL phase-locked loop circuit 3 between electrical network 1 and the CPU13; Insert second PLL phase-locked loop circuit 15 between reactor 2 and the CPU13.
The groundwork of whole device partly is AC side and DC side; AC side can compensate the reactive power of electrical network 1; Through DC side transformer 11 is suppressed by the magnetic bias that the neutral point direct current electric current causes; Wherein AC side is a voltage type PWM rectifier 4, only lets it operate in rectification state, promptly not only from electrical network 1 absorbing reactive power but also absorb the state of active power; The active power that absorbs is used to reduce line loss and suppresses D.C. magnetic biasing, and the reactive power of absorption is used to improve the power factor (PF) of electrical network 1; The DC side major part is a DC-DC converter 10, can change output voltage along with the bias current size of neutral point, thereby the neutral point direct current magnetic bias of transformer 11 is suppressed.
When the D.C. magnetic biasing phenomenons take place in transformer 11, through neutral line Hall current sensor 12 detection signal is sent into CPU13, CPU13 control its switch 8 is linked into DC side 6 with protective circuit 7, DC-DC converter 10 then; Begin to produce DC power supply and suppress D.C. magnetic biasing, PWM rectifier 4 is in rectification state under the current state, can only be operated in three, four-quadrant; Wherein PWM rectifier 4 is equivalent to inductance when three quadrants; PWM rectifier 4 is equivalent to electric capacity when four-quadrant, not only can absorb active power but also can absorbing reactive power, and wherein active power is much larger than reactive power; When the needs potential compensation; The active power energy consumption increases, and detection signal feeds back to the control core CPU 13 of reactive power compensation, and DC-DC converter 10 just can utilize this active power to suppress D.C. magnetic biasing; This moment, the effect of protective circuit 7 was when the voltage on the dc bus surpasses safety value; IGBT conducting on the excess voltage protection, through this circuit earial drainage, the unnecessary electric energy on the bus distributes with the form of heat; When transformer 11 non DC bias phenomenons produce; Through neutral line Hall current sensor 12 detection signal is sent into CPU13; CPU13 control its switch 8 is broken off; Protective circuit 7, DC-DC converter 10 are excised from DC side 6, and PWM rectifier 4 is operated near under the pure electric capacity state at this moment, i.e. the negative semiaxis of Y axle.
The three-phase commutation bridge that six IGBT5 are constituted is connected on the electrical network 1 through reactor 2; Pass through first PLL phase-locked loop circuit 3 then, according to instantaneous reactive power theory, real component in the detection of grid 1 and idle component; Draw the reactive current of required generation simultaneously; Again through second PLL phase-locked loop circuit 15 sensed current signal, according to instantaneous reactive power theory, in conjunction with the resistance value of known reactor 2; Calculate the active current that potential compensation consumed; Produce the relative trigger pulse with above by first PLL phase-locked loop circuit 3, second two detection signals input CPU13 that PLL phase-locked loop circuit 15 is drawn, reach the double effects of reactive power compensation and potential compensation.
So, when the whole device of control, realize both having guaranteed that PWM rectifier 4 is operated in four-quadrant, regulate DC-DC converter 10 output available powers again.
Claims (4)
1. the transformer DC magnetic bias compensation arrangement that has no-power compensation function; It is characterized in that: said device comprises the PWM rectifier (4) that is connected through reactor (2) with electrical network (1), and PWM rectifier (4) is to be connected to form by the three-phase commutation bridge that IGBT (5) and fly-wheel diode (14) constitute; PWM rectifier (4) is parallelly connected with DC side (6) as the AC side of whole device; Wherein DC side (6) comprises that electric capacity, resistance, DC-DC converter (10) compose in parallel; Between resistance and DC-DC converter (10), insert diverter switch (8), wherein DC-DC converter (10) is connected to form by IGBT (5), fly-wheel diode (14); A circuit of DC-DC converter (10) connects ground wire, and another link tester is crossed choke (9) and is connected with transformer (11), and transformer (11) is connected with CPU (13) through neutral line Hall current sensor (12); Be connected through first PLL phase-locked loop circuit (3) between electrical network (1) and the CPU (13); Insert second PLL phase-locked loop circuit (15) between reactor (2) and the CPU (13).
2. according to the said transformer DC magnetic bias compensation arrangement of claim 1 with no-power compensation function; It is characterized in that: DC side (6) is composed in parallel by electric capacity, resistance, protective circuit (7), DC-DC converter (10), between protective circuit (7) and resistance, inserts diverter switch (8); Wherein protective circuit (7) is connected to form by resistance, IGBT (5), fly-wheel diode (14).
3. the control method that has the transformer DC magnetic bias compensation arrangement of no-power compensation function according to claim 1; It is characterized in that: said control method is for to compensate through the reactive power of AC side to electrical network (1); Suppress through the neutral point direct current magnetic bias of DC side to transformer (11), concrete grammar is:
When the D.C. magnetic biasing phenomenon takes place in transformer (11), through neutral line Hall current sensor (12) detection signal is sent into CPU (13), CPU (13) control its switch (8) is linked into DC side (6) with DC-DC converter (10) then; Begin to produce DC power supply and suppress D.C. magnetic biasing, PWM rectifier (4) is in rectification state under the current state, can only be operated in three, four-quadrant; Wherein PWM rectifier (4) is equivalent to inductance when three quadrants; PWM rectifier (4) is equivalent to electric capacity when four-quadrant, not only can absorb active power but also can absorbing reactive power, and wherein active power is much larger than reactive power; When the needs potential compensation; The active power energy consumption increases, and detection signal feeds back to the control core CPU (13) of reactive power compensation, and DC-DC converter (10) just utilizes this active power to suppress D.C. magnetic biasing; When transformer (11) non DC bias phenomenon produces; Through neutral line Hall current sensor (12) detection signal is sent into CPU (13); CPU (13) control its switch (8) is broken off; DC-DC converter (10) is excised from DC side (6), and PWM rectifier this moment (4) is operated near under the pure electric capacity state, i.e. the negative semiaxis of Y axle;
Through first PLL phase-locked loop circuit (3), according to instantaneous reactive power theory, real component and idle component in the detection of grid (1); Draw the reactive current of required generation simultaneously; Again through second PLL phase-locked loop circuit (15) sensed current signal, according to instantaneous reactive power theory, in conjunction with the resistance value of known reactor (2); Calculate the active current that potential compensation consumed; With above two detection signal input CPU (13) that drawn by first PLL phase-locked loop circuit (3), second PLL phase-locked loop circuit (15), produce the relative trigger pulse, reach the double effects of reactive power compensation and potential compensation.
4. according to the said control method of claim 3 with transformer DC magnetic bias compensation arrangement of no-power compensation function; It is characterized in that: when the D.C. magnetic biasing phenomenon takes place transformer (11); Through neutral line Hall current sensor (12) detection signal is sent into CPU (13); CPU (13) control its switch (8) is linked into DC side (6) with DC-DC converter (10), protective circuit (7) then, begins to produce DC power supply and suppresses D.C. magnetic biasing; When transformer (11) non DC bias phenomenon produces, through neutral line Hall current sensor (12) detection signal is sent into CPU (13), CPU (13) control its switch (8) is broken off, and DC-DC converter (10), protective circuit (7) are excised from DC side (6).
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102624010A (en) * | 2012-04-19 | 2012-08-01 | 四川电力科学研究院 | Dynamic reactive compensation control method applied to alternating current-direct current hybrid transmission power grid |
| 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 |
| CN104242276A (en) * | 2013-06-07 | 2014-12-24 | 华北电力大学 | Novel transformer DC bias inhibition device |
| CN104796032B (en) * | 2014-01-20 | 2018-03-30 | 珠海格力电器股份有限公司 | Air conditioning system |
| CN103903840B (en) * | 2014-04-16 | 2017-05-10 | 沈阳工业大学 | Power transformer with magnetic bias compensating function |
| CN104022698A (en) * | 2014-06-20 | 2014-09-03 | 沈阳工业大学 | Novel power transformer control system with both direct-current magnetic bias function and reactive compensation function |
| CN104360180B (en) * | 2014-06-26 | 2017-12-26 | 许继集团有限公司 | A kind of converter transformer DC magnetic bias suppresses experimental rig and test method |
| CN106532723B (en) * | 2016-09-08 | 2018-12-18 | 华北电力大学 | Idle method of adjustment under series transformer D.C. magnetic biasing in THE UPFC |
| WO2019088817A1 (en) * | 2017-10-31 | 2019-05-09 | VÁZQUEZ HERNÁNDEZ, Ángel | Energy-optimising apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101306653A (en) * | 2008-04-08 | 2008-11-19 | 北京交通大学 | Traction power supply equipment based on PWM rectifier and control method |
| CN201829945U (en) * | 2010-10-26 | 2011-05-11 | 沈阳工业大学 | Transformer direct-current magnetic biasing compensating device with reactive compensation function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101306653A (en) * | 2008-04-08 | 2008-11-19 | 北京交通大学 | Traction power supply equipment based on PWM rectifier and control method |
| CN201829945U (en) * | 2010-10-26 | 2011-05-11 | 沈阳工业大学 | Transformer direct-current magnetic biasing compensating device with reactive compensation function |
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