CN102901893B - Control method for drag test of power units of high voltage static reactive power compensation device - Google Patents
Control method for drag test of power units of high voltage static reactive power compensation device Download PDFInfo
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- CN102901893B CN102901893B CN201210364459.0A CN201210364459A CN102901893B CN 102901893 B CN102901893 B CN 102901893B CN 201210364459 A CN201210364459 A CN 201210364459A CN 102901893 B CN102901893 B CN 102901893B
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Abstract
The invention discloses a control method for a drag test of power units of a high voltage static reactive power compensation device. The method comprises the following steps of: (1) controlling a power unit A in the drag test; (2) controlling the power unit B in the drag test; and (3) reducing triple frequency harmonic content in the current. The control method has the beneficial effects that 1) the operation is simple, corresponding current can be output by setting different reactive currents, and the amplitude and the phase position of the output voltage are not needed to be repeatedly adjusted manually; 2) the cost is reduced; under the same current higher harmonic, a back-to-back structure needs two electric reactors, but the method only needs an electric reactor, and the capacity of the electric reactor of the method is half of that of the back-to-back structure; and 3) the triple frequency harmonic content in the current can be effectively reduced, and the current waveform can be improved.
Description
Technical field:
The present invention relates to a kind of control method of power cell mechanical back to back test, especially for a control method for high-pressure static reactive power compensation device power cell mechanical back to back test, be applicable to the power cell of high-pressure static reactive power compensation device, high voltage converter to carry out the test of declared working condition operation.
Background technology:
In order effectively to verify control under power cell declared working condition, protection, temperature rise, electromagnetic compatibility, electric parameter choose and install and connect technique whether reach designing requirement, and power cell need to carry out the running test under nominal operating conditions.
Chinese patent SVG link discloses to the control system (application number is 201120230665.3, the applying date be to be on March 14th, 2012 July 2, the day for announcing in 2011) of mending test unit the back to back structure (referring to Fig. 1) that a kind of power cell mechanical back to back test adopts back-to-back: two unit DC terminal are directly connected, ac output end is connected respectively by two reactors, now in circuit, having two independently current paths, is different by the electric current of two reactors.Two modules, by outside direct voltage source stable DC voltage, adopt open loop control to make to exchange the PWM voltage of the end different amplitudes of output and phase place.In test, amplitude and the phase place of power cell A output AC voltage immobilize, and amplitude and the phase place of manual Modulating Power unit B output voltage, to realize reactive current flowing between power model.Owing to being only flowing of reactive current, therefore only need to absorb from outside a small amount of active power with the loss of supplemental capacity unit switch, thereby in miniwatt situation, just can carry out the running test under declared working condition to power cell consuming very.
Although said method has advantages of that algorithm simply, does not need, by algorithm stable DC voltage, to have following shortcoming:
1) manually adjust the amplitude of output voltage and phase angle and realize the process more complicated of certain reactive current output, need to repeatedly attempt, and along with amplitude and the phase angle of the different output voltages of DC voltage need to be readjusted;
2), when the power cell of H bridge construction carries out mechanical back to back test, for the direct short-circuit of avoiding DC voltage need to be at two of a unit ac output end two reactors of connecting respectively, thereby increase cost;
3) power cell of H bridge construction can pass through the switching frequency of the anti-phase raising output voltage of modulating wave to the twice of IGBT switching frequency, thereby the higher harmonic components in reduction electric current, and the switching frequency that in existing method, the switching frequency of reactor both end voltage is IGBT, this causes higher harmonic content in electric current to greatly increase.
Summary of the invention:
The object of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of control method for high-pressure static reactive power compensation device power cell mechanical back to back test is provided, in the method, two power cells are taked respectively different main circuit connected mode and control method, and take measures to reduce third harmonic content in electric current.
The object of the invention is to solve by the following technical programs:
For a control method for high-pressure static reactive power compensation device power cell mechanical back to back test, comprise the steps:
(1) in mechanical back to back test, power cell A controls: power cell A DC terminal is connected with direct voltage source, exchanges end and is connected with power cell B ac output end by a reactor, takes open loop to be controlled at the PWM voltage that exchanges end output;
(2) in mechanical back to back test, power cell B controls: power cell B DC terminal is unsettled, by a reactor, (embody is identical reactor with feature 1 reactor to ac output end, such as reactor in claim 1) be connected with power cell A ac output end, take two closed-loop controls of Voltage loop and electric current loop, stable DC voltage is also realized reactive current flowing between power cell A and power cell B;
(3) reduce third harmonic content in electric current: reactive current circulating between power cell A and power cell B causes the secondary fluctuation of DC voltage, and contain third-harmonic component in the alternating voltage that the fluctuation of the secondary of DC voltage causes power cell A or power cell B to export under Sine Modulated, and then cause containing in electric current larger third-harmonic component, the strategy of adjusting according to sampling DC voltage offset of sinusoidal modulating wave, reduce third-harmonic component in output voltage, thereby reduce third-harmonic component in output current.
Described step (1) comprising:
(a) benchmark modulating wave generates: calculates by trigonometric function the sinusoidal modulation wave that generation certain degree of modulation and frequency are 50Hz;
(b) adjustment of benchmark modulating wave: according to the fluctuation situation of power cell A DC voltage, modulating wave is adjusted, to reduce the third-harmonic component in power cell A output AC voltage;
(c) drive signal to generate: modulating wave and carrier wave ratio generate driving signal.
Described step (2) comprising:
(A) voltage close loop control: voltage close loop is taked PI controller, wherein DC voltage is set the reference value as Voltage loop, and the sampling of DC voltage is as the value of feedback of Voltage loop;
(B) current closed-loop control: electric current loop is taked P controller, wherein the result of calculation of Voltage loop is as active current reference value, and reactive current is set the reactive current reference value as electric current loop, and the sampling of alternating current is as the value of feedback of electric current loop;
(C) adjustment of feed-forward voltage: according to the fluctuation of unit DC voltage, benchmark sinusoidal modulation wave in voltage source unit control method is adjusted, to reduce the third-harmonic component in unit output AC voltage;
(D) drive signal to generate: step (B) and step (C) result of calculation sum, as final modulating wave, generate driving signal with carrier wave ratio.
In described step (1), PWM voltage is equivalent to sinusoidal voltage.
Beneficial effect of the present invention
1) simple to operate, just can realize the output of corresponding electric current by setting different reactive currents, do not need repeatedly manually to adjust amplitude and the phase place of output voltage;
2) cost-saving, under same current higher hamonic wave, back to back structure needs two reactors, and the method only to need a capacity be the reactor of the former half;
3) can effectively reduce third harmonic content in electric current, improve current waveform.
Brief description of the drawings:
Fig. 1 is existing power cell mechanical back to back test back to back structure schematic diagram;
Fig. 2 is power cell mechanical back to back test platform schematic diagram of the present invention;
Fig. 3 is power cell mechanical back to back test control block diagram of the present invention.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is described in further detail:
Referring to Fig. 2-3, a kind of control method for high-pressure static reactive power compensation device power cell mechanical back to back test, comprises the steps:
(1) in mechanical back to back test, power cell A controls: power cell A DC terminal is connected with direct voltage source, exchanges end and is connected with power cell B ac output end by a reactor, takes open loop to be controlled at the PWM voltage that exchanges end output; Described PWM voltage is equivalent to sinusoidal voltage.
(2) in mechanical back to back test, power cell B controls: power cell B DC terminal is unsettled, by a reactor, (embody is identical reactor with feature 1 reactor to ac output end, such as reactor in claim 1) be connected with power cell A ac output end, take two closed-loop controls of Voltage loop and electric current loop, stable DC voltage is also realized reactive current flowing between power cell A and power cell B;
(3) reduce third harmonic content in electric current: reactive current circulating between power cell A and power cell B causes the secondary fluctuation of DC voltage, and contain third-harmonic component in the alternating voltage that the fluctuation of the secondary of DC voltage causes power cell A or power cell B to export under Sine Modulated, and then cause containing in electric current larger third-harmonic component, the strategy of adjusting according to sampling DC voltage offset of sinusoidal modulating wave, reduce third-harmonic component in output voltage, thereby reduce third-harmonic component in output current.
Described step (1) comprising:
(a) benchmark modulating wave generates: calculates by trigonometric function the sinusoidal modulation wave that generation certain degree of modulation and frequency are 50Hz;
(b) adjustment of benchmark modulating wave: according to the fluctuation situation of power cell A DC voltage, modulating wave is adjusted, to reduce the third-harmonic component in power cell A output AC voltage;
(c) drive signal to generate: modulating wave and carrier wave ratio generate driving signal.
Described step (2) comprising:
(A) voltage close loop control: voltage close loop is taked PI controller, wherein DC voltage is set the reference value as Voltage loop, and the sampling of DC voltage is as the value of feedback of Voltage loop;
(B) current closed-loop control: electric current loop is taked P controller, wherein the result of calculation of Voltage loop is as active current reference value, and reactive current is set the reactive current reference value as electric current loop, and the sampling of alternating current is as the value of feedback of electric current loop;
(C) adjustment of feed-forward voltage: according to the fluctuation of unit DC voltage, benchmark sinusoidal modulation wave in voltage source unit control method is adjusted, to reduce the third-harmonic component in unit output AC voltage;
(D) drive signal to generate: step (B) and step (C) result of calculation sum, as final modulating wave, generate driving signal with carrier wave ratio.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, but not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the method for above-mentioned announcement and technology contents to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, still belong in the scope of technical solution of the present invention.
Claims (3)
1. for a control method for high-pressure static reactive power compensation device power cell mechanical back to back test, it is characterized in that, comprise the steps:
(1) in mechanical back to back test, power cell A controls: power cell A DC terminal is connected with direct voltage source, exchanging end is connected with power cell B ac output end by a reactor, take open loop to be controlled at the PWM voltage that exchanges end output, wherein PWM voltage is equivalent to sinusoidal voltage;
(2) in mechanical back to back test, power cell B controls: power cell B DC terminal is unsettled, ac output end is connected with power cell A ac output end by a reactor, take two closed-loop controls of Voltage loop and electric current loop, stable DC voltage is also realized reactive current flowing between power cell A and power cell B; Comprise:
(A) voltage close loop control: voltage close loop is taked PI controller, wherein DC voltage is set the reference value as Voltage loop, and the sampling of DC voltage is as the value of feedback of Voltage loop;
(B) current closed-loop control: electric current loop is taked P controller, wherein the result of calculation of Voltage loop is as active current reference value, and reactive current is set the reactive current reference value as electric current loop, and the sampling of alternating current is as the value of feedback of electric current loop;
(C) adjustment of feed-forward voltage: according to the fluctuation of unit DC voltage, benchmark sinusoidal modulation wave in voltage source unit control method is adjusted, to reduce the third-harmonic component in unit output AC voltage;
(D) drive signal to generate: step (B) and step (C) result of calculation sum, as final modulating wave, generate driving signal with carrier wave ratio;
(3) reduce third harmonic content in electric current: reactive current circulating between power cell A and power cell B causes the secondary fluctuation of DC voltage, and contain third-harmonic component in the alternating voltage that the fluctuation of the secondary of DC voltage causes power cell A or power cell B to export under Sine Modulated, and then cause containing in electric current larger third-harmonic component, the strategy of adjusting according to sampling DC voltage offset of sinusoidal modulating wave, reduce third-harmonic component in output voltage, thereby reduce third-harmonic component in output current.
2. control method as claimed in claim 1, is characterized in that, described step (1) comprising:
(a) benchmark modulating wave generates: calculates by trigonometric function the sinusoidal modulation wave that generation certain degree of modulation and frequency are 50Hz;
(b) adjustment of benchmark modulating wave: according to the fluctuation situation of power cell A DC voltage, modulating wave is adjusted, to reduce the third-harmonic component in power cell A output AC voltage;
(c) drive signal to generate: modulating wave and carrier wave ratio generate driving signal.
3. control method as claimed in claim 1, is characterized in that, in described step (1), PWM voltage is equivalent to sinusoidal voltage.
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Families Citing this family (7)
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| CN103267917B (en) * | 2013-06-06 | 2016-03-30 | 新风光电子科技股份有限公司 | A kind of method and apparatus of high-capacity reactive compensation device full-load test |
| CN104122477A (en) * | 2014-08-08 | 2014-10-29 | 国家电网公司 | Device and method for testing dynamic reactive power compensation device based on virtual instrument technology |
| CN107643455A (en) * | 2016-07-21 | 2018-01-30 | 西安奥特迅电力电子技术有限公司 | The control platform that a kind of mechanical back to back test for railway power regulator power cell is tested |
| CN106483411B (en) * | 2016-11-29 | 2019-07-30 | 西安奥特迅电力电子技术有限公司 | A kind of power cell test method interfered with each other between simulation cascaseded power cell |
| CN110286316B (en) * | 2019-07-02 | 2022-02-01 | 中车大连机车研究所有限公司 | Pure inductance drag-based power module full-power test method and system |
| CN112557792A (en) * | 2020-12-04 | 2021-03-26 | 广东电网有限责任公司 | Power electronic transformer power module online testing device and method thereof |
| CN114825991A (en) * | 2022-03-14 | 2022-07-29 | 思源清能电气电子有限公司 | Topological structure and method for testing power electronic converter |
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