CN201946981U - Generating device for simulating electrical property of typical non-linear loads - Google Patents
Generating device for simulating electrical property of typical non-linear loads Download PDFInfo
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- CN201946981U CN201946981U CN2010206961283U CN201020696128U CN201946981U CN 201946981 U CN201946981 U CN 201946981U CN 2010206961283 U CN2010206961283 U CN 2010206961283U CN 201020696128 U CN201020696128 U CN 201020696128U CN 201946981 U CN201946981 U CN 201946981U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a generating device for simulating electrical property of typical non-linear loads, which comprises a harmonic source (1), a feedback link (2), a middle direct current link (3), a control terminal (4), a fist lower control limit (LCL) wave filtering link (5), a second LCL wave filtering link (6) and an outside arranged resistor link (7). The control terminal (4) is realized by adopting a digital signal processor (DSP) controller, and produces a control signal according to subscribers, and controls a harmonic source portion to produce current disturbance. The harmonic source is in cascade connection with the feedback link through the middle direct current capacitor. An alternating current (AC)-direct current (DC)-AC structure is formed and energy feedback is realized. A harmonic source AC side is connected with an outside arranged resistor and a grid through a first wave filter. A feedback link AC side is connected with the grid through the second LCL wave filtering link. The resistor arranged outside is utilized for obtaining harmonic voltage. The generating device for simulating electrical property of typical non-linear loads can simulate a plurality of compound-frequency harmonic currents, and simulate conditions of the non-liner loads such as an electric arc furnace, an intermediate frequency furnace, and a frequency converter.
Description
Technical field
The utility model relates to a kind of generating means of simulating typical non linear load electrical characteristic, and this device comprises that harmonic wave takes place, the inversion energy regenerative, and harmonic current is measured and harmonic voltage measurement, belongs to the Measurement of Harmonics in Power System field.
Background technology
Along with growing continuously and fast of power industry, the continuous increase of nonlinear loads such as various power electronic equipments, arc furnace and electrically-driven car in the electric power system, very big variation has taken place in electrical network and part throttle characteristics, and the voltage and current distortion is more and more obvious.The metering of the reactive energy of electric power system is extremely important, and it is related to the interests for the electricity consumption both sides, also is to strengthen harmonic management, improves the prerequisite of electric power quality management and safe operation.All need from the harmonious signal wave current of input harmonics of electric power network voltage before using various wattless power measurement algorithms such as Hilbert algorithm, Fourier algorithm, Walsh algorithm measurement power system reactive power, so accurately obtain the harmonic voltage of electrical network and the value of harmonic current seems extremely important.
Some study the device that current harmonicss produce at present, and as the electrical energy power quality disturbance generating means of simulation nonlinear load actual condition, this device can only detect current harmonics and can not obtain voltage harmonic.The device that directly uses PWM current transformer generation harmonic wave can not accomplish to save electric energy not the electric energy feedback grid.The utility model can detect current harmonics and voltage harmonic simultaneously, the electric energy of harmonic wave consumption is fed back to electrical network, thereby save a large amount of electric energy.
The utility model content
Technical problem to be solved in the utility model provides a kind of high-power, low-power consumption, can produce harmonic voltage and harmonic current, the generating means of various typical non linear load electrical characteristics such as simulation arc furnace, intermediate frequency furnace, welding machine, frequency converter.
For solving the problems of the technologies described above, the utility model provides a kind of generating means of simulating typical non linear load electrical characteristic, comprise harmonic source, feedback link, intermediate dc electric capacity, control terminal, a LCL (inductor-capacitor-inductance) filtering link, the 2nd LCL filtering link, external resistance, it is characterized in that: described control terminal adopts dsp controller to realize, set the generation control signal according to the user, the control harmonic source partly produces current disturbing; Harmonic source passes through the cascade mutually of intermediate dc electric capacity with the feedback link, forms the AC-DC-AC topological structure, realizes the energy feedback; The AC side of harmonic source links to each other with electrical network by a LCL filtering link, and the AC side of feedback link is connected with electrical network by the 2nd LCL filtering link.
The generating means of aforesaid simulation typical non linear load electrical characteristic, it is characterized in that: described harmonic source comprises first brachium pontis, second brachium pontis, the 3rd brachium pontis, form three-phase bridge PWM converter structure, the DC side of harmonic source is connected with intermediate dc electric capacity, one end of an AC side and a LCL filtering link joins, and a described LCL filtering link comprises first inductance, second inductance, the 3rd inductance, the 4th inductance, the 5th inductance, the 6th inductance and first capacitance-resistance, second capacitance-resistance, three single-phase T mode filters of the 3rd capacitance-resistance composition; The mid point of first brachium pontis links to each other with the 4th inductance, and the mid point of second brachium pontis links to each other with the 5th inductance, and the mid point of the 3rd brachium pontis links to each other with the 6th inductance.
The generating means of aforesaid simulation typical non linear load electrical characteristic, it is characterized in that: described feedback link comprises the 4th brachium pontis, the 5th brachium pontis and the 6th brachium pontis, form three-phase bridge PWM converter structure, the DC side of feedback link links to each other with intermediate dc electric capacity, AC side links to each other with the 2nd LCL filtering link, and described the 2nd LCL filtering link is formed three individual event T mode filters by the 7th inductance, the 8th inductance, the 9th inductance, the tenth inductance, the 11 inductance, the 12 inductance and the 4th capacitance-resistance, the 5th capacitance-resistance, the 6th capacitance-resistance; The mid point of the 4th brachium pontis links to each other with the 7th inductance, and the mid point of the 5th brachium pontis links to each other with the 8th inductance, and the mid point of the 6th brachium pontis links to each other with the 9th inductance.
The generating means of aforesaid simulation typical non linear load electrical characteristic, it is characterized in that: described external resistance comprises the 7th resistance, the 8th resistance, the 9th resistance, the left side of the 7th resistance links to each other with the tenth inductance of the 2nd LCL filtering link, and the right side links to each other with first inductance of a LCL filtering link; The left side of the 8th resistance links to each other with the 11 inductance of the 2nd LCL filtering link, and the right side links to each other with second inductance of a LCL filtering link; The left side of the 9th resistance links to each other with the 12 inductance of the 2nd LCL filtering link, and the right side links to each other with the 3rd inductance of a LCL filtering link; The 7th resistance, the 8th resistance, the 9th resistance respectively with a short-circuit piece parallel connection, the effect of short-circuit piece is to work when the dc capacitor link is charged to a certain degree, resistive short, harmonic current increases on the circuit, the dc capacitor link continues to be charged to stationary value, and the voltage on the measuring resistance is harmonic voltage.
Described control terminal adopts dsp controller to realize, sets the generation control signal according to the user, and the control harmonic source partly produces current disturbing.Described harmonic source is realized by the PWM current transformer, adopts the current tracking control technology, and the command signal of tracking Control terminal produces the harmonic wave that requires.The AC side of harmonic source links to each other with electrical network, middle by a LCL filtering link, external resistance and contactor, switch, fuse, the one LCL filter filtering switch subharmonic, obtain harmonic voltage on the external resistance, necessary safety device when contactor, switch, fuse are the circuit actual motion.Harmonic source passes through the cascade mutually of intermediate dc electric capacity with the feedback link, forms the AC-DC-AC structure, realizes the energy feedback.Described feedback link has inverter to realize, it is uncertain to keep dc capacitor voltage that the energy of the high-power electric current consumption that harmonic source is produced is fed back to mains side.The same current tracking control technology that adopts of the bad joint of feedback, its AC side are fed back to power supply after by the switch subharmonic in the LCL filtering link filtering electric current.
According to instantaneous reactive power theory, for the PWM inverter, if do not consider the loss of each several part, then the instantaneous active power of AC side will all be delivered to DC side, instantaneous active power is depended in the energy exchange that is AC side and DC side, and irrelevant with reactive power.Therefore, producing active current will make dc capacitor voltage constantly raise.The utility model feeds back to electrical network after adopting Feedback Technology will be delivered to the energy inversion of DC side, to keep the stable of dc capacitor voltage.
Utilize this device just can simulate various typical nonlinear loads such as arc furnace, intermediate frequency furnace, welding machine, frequency converter etc., and in device allows range of capacity, regulate arbitrarily at harmonic current.Adopt the electric energy Feedback Technology, the electric energy of harmonic wave consumption is fed back to electrical network, thereby save a large amount of electric energy, the part of feedback simultaneously is by LCL filtering link, can filtering switch subharmonic, do not influence electrical network.
Description of drawings
Fig. 1 is the The general frame of the generating means of simulation typical non linear load electrical characteristic.
Fig. 2 is a main circuit structure schematic diagram of the present utility model.
Fig. 3 is the harmonic source schematic diagram.
Fig. 4 is harmonic source control principle figure.
Fig. 5 is a feedback link schematic diagram.
Fig. 6 is feedback link control principle figure.
Embodiment
Accompanying drawing is embodiment of the present utility model, in conjunction with the accompanying drawings the utility model is described:
This device comprises harmonic source 1, feedback link 2, intermediate dc link 3, control terminal 4, a LCL filtering link 5, the 2nd LCL filtering link 6, external resistance 7; Described control terminal 4 adopts dsp controller to realize, sets the generation control signal according to the user, and the control harmonic source partly produces current disturbing.Harmonic source 1 passes through intermediate dc electric capacity 3 cascade mutually with feedback link 2, forms the AC-DC-AC topological structure, realizes the energy feedback; The AC side of harmonic source 1 links to each other with electrical network with external resistance 7 by a LCL filtering link 5, and the AC side of feedback link 2 links to each other with electrical network by the 2nd LCL filtering link 6.
1, harmonic source
As Fig. 3, harmonic source can be regarded the nonlinear load of power supply as.Comprise the first brachium pontis N1, the second brachium pontis N2, the 3rd brachium pontis N3, form three-phase bridge PWM converter structure, the DC side of harmonic source 1 links to each other with intermediate dc electric capacity 3, AC side links to each other with an end of a LCL filtering link, and a described LCL filtering link 5 is formed the single-phase T mode filter of Sanger by first inductance L 11, second inductance L 12, the 3rd inductance L 13, the 4th inductance L 21, the 5th inductance L 22, the 6th inductance L 23 and the first capacitance-resistance RC1, the second capacitance-resistance RC2, the 3rd capacitance-resistance RC3; Wherein the mid point of the first brachium pontis N1 links to each other with the 4th inductance L 21, and the mid point of the second brachium pontis N2 links to each other with the 5th inductance L 22, and the mid point of the 3rd brachium pontis N3 links to each other with the 6th inductance L 23.
According to setting absorption current from electrical network of control terminal, produce the harmonic current of appointment, the simulation nonlinear load.Harmonic source itself is cashed out the characteristic of nonlinear load in this case.For harmonic source, the feedback link is the resistive load of DC side, absorbs the power of power supply for keeping the stable of dc capacitor voltage thereby consume harmonic source.
The given of harmonic current finished by control terminal, superposes given as harmonic current behind the each harmonic electric current that the harmonic current command signal is produced by control terminal.
The PWM control mode of harmonic source adopts the triangular wave manner of comparison, control terminal produces command signal according to setting, actual current waveform as feedback signal, is deducted after the feedback signal command signal as the control signal of main circuit switch device, and control mode is seen shown in Figure 4.
2, feedback link
Feedback link schematic diagram as shown in Figure 5, feedback link 2 comprises the 4th brachium pontis N4, the 5th brachium pontis N5, the 6th brachium pontis N6, form three-phase bridge PWM converter structure, the DC side of feedback link 2 links to each other with intermediate dc electric capacity 3, AC side links to each other with an end of the 2nd LCL filtering link 6, and described the 2nd LCL filtering link 6 is formed three single-phase T mode filters by the 7th inductance L 31, the 8th inductance L 32, the 9th inductance L 33, the tenth inductance L the 41, the 11 inductance L the 42, the 12 inductance L 43 and the 4th capacitance-resistance RC4, the 5th capacitance-resistance RC5, the 6th capacitance-resistance RC6; Wherein, the mid point of the 4th brachium pontis N4 links to each other with the 7th inductance L 31, and the mid point of the 5th brachium pontis N5 links to each other with the 8th inductance L 32, and the mid point of the 6th brachium pontis N6 links to each other with the 9th inductance L 33.
The wherein electric capacity of main circuit and the same electric capacity of the condenser type in the harmonic source.For power supply, harmonic source is its nonlinear load, and for the feedback link, because shared electric capacity and dc capacitor voltage are almost constant, harmonic source is equivalent to the DC power supply of feedback part DC side again, and the feedback link feeds back to electrical network after with dc inversion, realizes the energy feedback.
The stable of capacitance voltage is crucial, and capacitance voltage is partly controlled by feedback.According to instantaneous reactive power theory, for the PWM inverter, if do not consider the loss of each several part, then the instantaneous active power of AC side will all be delivered to DC side, instantaneous active power is depended in the energy exchange that is AC side and DC side, and irrelevant with reactive power.Therefore, as long as control capacitance voltage is control active power (being active current), and meritorious reactive current direct given needs calculated phase angle, so directly not given, but adopt given method based on the meritorious reactive current of dqo conversion, through active current after the conversion only and i
qRelevant, reactive current only and i
dRelevant, and all be DC component, i
qAnd i
dSize equate with the amplitude of active current reactive current respectively.Passing ratio integrator PI3 deducts reference voltage and carries out proportional integral behind the dc capacitor voltage and obtain keeping capacitance voltage and stablize required electric current Δ i
q
The PWM control mode of feedback link is identical with the harmonic source part, still adopts the triangular wave manner of comparison.Command signal is by load current i
LThe active current stable with keeping dc capacitor voltage is formed by stacking, as shown in Figure 6.Actual feedback waveform as feedback signal, is carried out proportional integral after command signal deducted feedback signal, obtain the Control current of main circuit, this Control current is carried out after the PWM conversion control signal as the main circuit switch device.
3, external resistance
That describes in the foregoing description and the specification just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.
Claims (5)
1. generating means of simulating typical non linear load electrical characteristic, this device comprises harmonic source (1), feedback link (2), intermediate dc link (3), control terminal (4), a LCL filtering link (5), LCL filtering link (6), external resistance link (7), it is characterized in that: control terminal (4) adopts dsp controller to realize, set the generation control signal according to the user, the control harmonic source partly produces current disturbing; Harmonic source passes through the cascade mutually of intermediate dc electric capacity with the feedback link, forms the AC-DC-AC structure, realizes the energy feedback; The harmonic source AC side links to each other with electrical network with external resistance by a LCL filter, and feedback link AC side links to each other with electrical network by the 2nd LCL filtering link.
2. the generating means of simulation typical non linear load electrical characteristic according to claim 1, it is characterized in that described harmonic source (1) comprises first brachium pontis (N1), second brachium pontis (N2), the 3rd brachium pontis (N3), form three-phase bridge PWM converter structure, the DC side of harmonic source (1) links to each other with intermediate dc electric capacity (3), AC side links to each other with an end of a LCL filtering link (5), and a described LCL filtering link (5) is by first inductance (L11), second inductance (L12), the 3rd inductance (L13), the 4th inductance (L21), the 5th inductance (L22), the 6th inductance (L23) and first capacitance-resistance (RC1), second capacitance-resistance (RC2), the 3rd capacitance-resistance (RC3) is formed three single-phase T mode filters; The mid point of first brachium pontis (N1) links to each other with the 4th inductance (L21), and the mid point of second brachium pontis (N2) links to each other with the 5th inductance (L22), and the mid point of the 3rd brachium pontis (N3) links to each other with the 6th inductance (L23).
3. the generating means of simulation typical non linear load electrical characteristic according to claim 1, it is characterized in that: described feedback link (2) comprises the 4th brachium pontis (N4), the 5th brachium pontis (N5), the 6th brachium pontis (N6), form three-phase bridge PWM converter structure, the DC side of feedback link (2) links to each other with intermediate dc electric capacity (3), AC side links to each other with an end of LCL filtering link (6), and described LCL filtering link (6) is by the 7th inductance (L31), the 8th inductance (L32), the 9th inductance (L33), the tenth inductance (L41), the 11 inductance (L42), the 12 inductance (L43) and the 4th capacitance-resistance (RC4), the 5th capacitance-resistance (RC5), the 6th capacitance-resistance (RC6) is formed three single-phase T mode filters; The mid point of the 4th brachium pontis (N4) links to each other with the 7th inductance (L31), and the mid point of the 5th brachium pontis (N5) links to each other with the 8th inductance (L32), and the mid point of the 6th brachium pontis (N6) links to each other with the 9th inductance (L33).
4. the generating means of simulation typical non linear load electrical characteristic according to claim 1, it is characterized in that: described external resistance link (7) comprises the 7th resistance (R7), the 8th resistance (R8), the 9th resistance (R9), the left side of the 7th resistance (R7) links to each other with the tenth inductance (L41) of the 2nd LCL filtering link (6), the right side links to each other with first inductance (L11) of a LCL filtering link (5), the left side of the 8th resistance (R8) links to each other with the 11 inductance (L42) of the 2nd LCL filtering link (6), the right side links to each other with second inductance (L12) of a LCL filtering link (5), the left side of the 9th resistance (R9) links to each other with the 12 inductance (L43) of the 2nd LCL filtering link (6), and the right side links to each other with the 3rd inductance (L13) of a LCL filtering link (5).
5. the generating means of simulation typical non linear load electrical characteristic according to claim 4 is characterized in that: the 7th resistance, the 8th resistance, the 9th resistance respectively with a short-circuit piece parallel connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206961283U CN201946981U (en) | 2010-12-31 | 2010-12-31 | Generating device for simulating electrical property of typical non-linear loads |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206961283U CN201946981U (en) | 2010-12-31 | 2010-12-31 | Generating device for simulating electrical property of typical non-linear loads |
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| CN201946981U true CN201946981U (en) | 2011-08-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066608A (en) * | 2012-12-21 | 2013-04-24 | 苏州振吴电炉有限公司 | Three-phase equilibrium single-double pole electric slag furnace |
| CN104466969A (en) * | 2014-12-31 | 2015-03-25 | 海南金盘电气有限公司 | LCL type filter based on three-winding transformer |
-
2010
- 2010-12-31 CN CN2010206961283U patent/CN201946981U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066608A (en) * | 2012-12-21 | 2013-04-24 | 苏州振吴电炉有限公司 | Three-phase equilibrium single-double pole electric slag furnace |
| CN104466969A (en) * | 2014-12-31 | 2015-03-25 | 海南金盘电气有限公司 | LCL type filter based on three-winding transformer |
| CN104466969B (en) * | 2014-12-31 | 2018-05-22 | 海南金盘电气有限公司 | A kind of LCL type wave filter based on three-winding transformer |
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Owner name: SOUTHEAST UNIVERSITY JIANGSU ELECTRIC POWER CO. ST Free format text: FORMER OWNER: SOUTHEAST UNIVERSITY Effective date: 20121022 Owner name: THE ELECTRIC POWER SCIENCE RESEARCH INSTITUTE OF J Free format text: FORMER OWNER: JIANGOU PROVINCIAL POWER TEST INST CO., LTD. Effective date: 20121022 |
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| C41 | Transfer of patent application or patent right or utility model | ||
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Free format text: CORRECT: ADDRESS; FROM: 210029 NANJING, JIANGSU PROVINCE TO: 210036 NANJING, JIANGSU PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20121022 Address after: 210036 Fenghuang West Street, Jiangsu, Nanjing, China, No. 243 Patentee after: Electric Power Research Institute of Jiangsu Electric Power Company Patentee after: Southeast University Patentee after: Jiangsu Electric Power Company Patentee after: State Grid Corporation of China Address before: 210029 No. 243 Fenghuang West Street, Jiangsu, Nanjing Patentee before: Jiangou Provincial Power Test Inst Co., Ltd. Patentee before: Southeast University |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20191231 |