CN105048477A - Self-adaptive phase sequence control method of static var compensator (SVC) device - Google Patents
Self-adaptive phase sequence control method of static var compensator (SVC) device Download PDFInfo
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Abstract
The invention discloses a self-adaptive phase sequence control method of a static var compensator (SVC) device. The method comprises the following steps of: acquiring voltage waveform of a secondary side of a voltage transformer through a data acquisition board and acquiring output voltage waveform of each power module through a voltage acquisition circuit by a main controller in the SVG device; respectively carrying out waveform superimposition calculation according to three phases A, B and C; carrying out phase comparison and calculation on the superimposed voltage waveform and the acquired voltage waveform of the secondary side of the voltage transformer; performing phase sequence control according to a phase calculation result; and leading a system bus voltage phase sequence corresponding to a wiring phase to be consistent with the output voltage phase sequence of a three-phase (A, B and C) reactive compensation unit of the SVG device. According to the self-adaptive phase sequence control method, the main controller is used for data processing on an acquired signal, the output voltage phase sequence of the three-phase reactive compensation unit of the SVG device is automatically adjusted by a simulation switch, thus, manual phase alignment is avoided, devices such as potential transformer (PT) are not needed to be additionally erected, power is unnecessarily cut off to adjust wiring, phase alignment efficiency is improved, and the speed of putting the SVG device into operation is accelerated.
Description
Technical field
the present invention relates to a kind of phase sequence control method of SVG device, belong to high-pressure reactive compensation field.
Background technology
need in network system running to carry out reactive power compensation to electrical network, to improve power factor during operation of power networks, reduce grid loss.In recent years, conventional reactive-load compensation equipment is dynamic reactive compensation device, is called for short SVG.
generally, be installed with a large amount of power model in the power cabinet of SVG device, power model is connected in series by carrying out grouping mutually, forms three-phase (A phase, B phase and C phase) reactive compensation unit, and the A phase of difference connected system bus, B phase and C phase.When SVG device is run, A phase, the B phase of voltage-phase and system busbar that A, B, C three-phase reactive compensation unit exports are necessary identical with the voltage-phase of C phase, could normally run.
for guaranteeing the normal operation of SVG, before SVG puts into operation, need the three-phase voltage phase place of the output voltage phase place of SVG three-phase reactive compensation unit and system busbar to compare respectively, and adjust phase sequence by the order of connection of adjustment SVG three-phase reactive compensation unit and system busbar, make the output voltage of SVG three-phase reactive compensation unit consistent with the phase sequence of system busbar (corresponding wiring phase), this process is called for short phase.
current SVG mainly contains two kinds to phase method:
one is gather the output voltage of SVG with high voltage potential transformer and compare with the secondary voltage of the voltage transformer of system busbar.This method needs to carry heavy high-voltage mutual inductor to on-the-spot, and needs on-the-spot adjustment cable or copper bar wiring, and wiring is loaded down with trivial details and there is electric shock hidden danger.
two is the complete SVG to phase of a kind of convenience disclosed in patent CN204230914U, comprises the SVG power cabinet being built-in with some power models, the master controller be connected with the power model of SVG power cabinet; Each power model connects a drive plate, and drive plate is with a voltage sampling circuit, and voltage sampling circuit gathers the ac output voltage waveform of power model; Master controller is also connected with the computer that storage has waveform software for display and standard voltage shape.To phase time, the ac output voltage waveform of each power model is gathered by drive plate and carries out A/D conversion, then passes in master controller and external computer, observes phase result by using the waveform software for display that computer is installed.This method needs the output waveform of checking each module, determines whether the output waveform of each module is consistent with expection, and namely each unanimously think that three-phase phase-sequence is corresponding with system phase sequence.This approach reduces the use to phase equipment, but need artificial judgment to phase result, and need the output waveform of checking each power model, process is loaded down with trivial details.Need manually to adjust cable or copper bar wiring after discovery phase sequence mistake, reduce the speed of putting into operation, and easily wiring accident occurs.
Summary of the invention
the technical issues that need to address of the present invention are to provide a kind of self adaptation phase sequence control method of SVG device, automatically can adjust phase sequence, avoid manually to phase and loaded down with trivial details wiring commutation work of taking out stitches, improve phase efficiency.
for solving the problems of the technologies described above, the technical solution adopted in the present invention is:
a kind of self adaptation phase sequence control method of SVG device, this SVG device comprises A, B, C three-phase reactive compensation unit, master controller and voltage transformer, A, B, in C three-phase, every phase reactive compensation unit is connected in series by some power models, and be connected with system busbar by cable or copper bar, each power model all arranges the voltage collection circuit for gathering ac output voltage waveform, and be connected to master controller, voltage transformer primary side connected system bus, secondary side connects the data acquisition board in master controller, master controller gathers voltage transformer secondary side voltage waveform by data acquisition board, the output voltage waveforms of each power model is gathered by voltage collection circuit, and press A, B, C three-phase carries out addition of waveforms calculating respectively, the voltage transformer secondary side voltage waveform of the voltage waveform after superposition and collection is carried out phase compare calculating, phase sequence control is carried out with phase calculation result, make the system busbar voltage phase sequence of corresponding wiring phase and the A of SVG device, B, C three-phase reactive compensation unit output voltage phase sequence is consistent.
further, master controller gather voltage waveform and carry out data processing, the process of phase sequence control comprises the following steps:
1) gather voltage transformer secondary side voltage waveform signal, gather the output voltage waveforms signal of all power models in SVG device A, B, C three-phase reactive compensation unit;
2) by the output voltage waveforms signal of all power models of step 1) collection by processing mutually, the output voltage waveforms signal often going up all power models in A, B, C three-phase is mutually carried out overlap-add procedure, as the output voltage waveforms signal of this phase, and adopt fft algorithm to extract the fundametal compoment of output voltage waveforms, obtain the fundametal compoment of output voltage waveforms of SVG device A, B, C three-phase reactive compensation unit, extract the fundametal compoment of voltage transformer secondary side voltage waveform simultaneously;
3) calculation procedure 2) in extract SVG device A, the fundametal compoment phase angle of output voltage waveforms of B, C three-phase reactive compensation unit and the fundametal compoment phase angle of voltage transformer secondary side voltage waveform compare, thus show that whether the output voltage phase sequence of the SVG device three-phase reactive compensation unit of corresponding wiring phase consistent with the voltage phase sequence of voltage transformer secondary side;
4) when the output voltage phase sequence of SVG device A, B, C three-phase reactive compensation unit and the voltage phase sequence of voltage transformer secondary side inconsistent time, master controller adjusts the output voltage phase sequence of SVG device A, B, C three-phase reactive compensation unit automatically, makes it consistent with the voltage phase sequence of the voltage transformer secondary side of corresponding wiring phase.
further, described step 2) in as follows by the process processed mutually to the output voltage waveforms signal of all power models,
after the output voltage waveforms signal of power models all in A phase is superposed, as A phase output voltage waveforms signal, fft algorithm is used to convert A phase output voltage waveforms signal, obtain the frequency domain information of A phase output voltage waveforms signal, and extract fundametal compoment from the frequency domain information of A phase output voltage waveforms signal;
after the output voltage waveforms signal of power models all in B phase is superposed, as B phase output voltage waveforms signal, fft algorithm is used to convert B phase output voltage waveforms signal, obtain the frequency domain information of B phase output voltage waveforms signal, and extract fundametal compoment from the frequency domain information of B phase output voltage waveforms signal;
after the output voltage waveforms signal of power models all in C phase is superposed, as C phase output voltage waveforms signal, fft algorithm is used to convert C phase output voltage waveforms signal, obtain the frequency domain information of C phase output voltage waveforms signal, and extract fundametal compoment from the frequency domain information of C phase output voltage waveforms signal;
the fundametal compoment process extracting the voltage waveform of voltage transformer secondary side is as follows:
the A phase voltage waveform signal of fft algorithm to voltage transformer secondary side is used to convert, obtain the frequency domain information of the A phase voltage waveform signal of voltage transformer secondary side, and extract fundametal compoment from the frequency domain information of the A phase voltage waveform signal of voltage transformer secondary side;
the B phase voltage waveform signal of fft algorithm to voltage transformer secondary side is used to convert, obtain the frequency domain information of the B phase voltage waveform signal of voltage transformer secondary side, and extract fundametal compoment from the frequency domain information of the B phase voltage waveform signal of voltage transformer secondary side;
the C phase voltage waveform signal of fft algorithm to voltage transformer secondary side is used to convert, obtain the frequency domain information of the C phase voltage waveform signal of voltage transformer secondary side, and extract fundametal compoment from the frequency domain information of the C phase voltage waveform signal of voltage transformer secondary side.
step 4) in, when the output voltage phase sequence of SVG device A, B, C three-phase reactive compensation unit and the voltage phase sequence of voltage transformer secondary side inconsistent time, master controller adjusts the output voltage phase sequence of SVG device A, B, C three-phase reactive compensation unit automatically by the software simulation switch of inside.
owing to have employed technique scheme, the technological progress that the present invention obtains is:
the present invention is by gathering the output voltage waveforms signal of voltage transformer secondary side voltage waveform signal and SVG device three-phase reactive compensation unit, and the signal gathered is superposed, extract first-harmonic, calculate phase angle, compare the data processings such as phase sequence, the analog switch in master controller is utilized automatically to adjust the output voltage phase sequence of SVG device three-phase reactive compensation unit, avoid artificial to phase, whole process completes the work to phase and adjustment automatically, do not need to set up PT(voltage transformer in addition) etc. device, power-off is not needed to adjust wiring, improve phase efficiency, accelerate the speed that puts into operation of SVG device.
gather the output voltage waveforms of the power model of all series connection in each phase, and using the output of multiple output voltage waveforms superposition as this phase, instead of represent with sampling, can eliminate some impact occurring the power model of accidental error under multiple superpositions, the mode of this overlap-add procedure reflects the output situation of every phase accurately.
output voltage waveforms signal is represented by the fundametal compoment in output voltage waveforms signal, effectively avoid harmonic signal (SVG device generation) impact on output voltage waveforms, because when there being humorous wave interference, larger on the impact of voltage waveform, when only needing to gather voltage waveform phase place, the fundametal compoment of voltage waveform is utilized to fully demonstrate phase information, do not need again to process harmonic signal numerous and diverse in voltage waveform information, enormously simplify the workload of computing, improve computing speed, eliminate harmonic influence simultaneously, make to accelerate the speed of phase.
use FFT(fast Fourier transform) signal is processed, accelerate the operational speed of a computer.When needs adjustment phase sequence, software simulation switch is utilized to adjust the output voltage phase sequence of SVG device three-phase reactive compensation unit.Software simulation switch realizes based on FPGA hardware in master controller and software code, utilize the output of software code control FPGA, thus realize the adjustment of the output voltage phase sequence of SVG device three-phase reactive compensation unit, power-off is not needed to adjust wiring, improve phase efficiency, accelerate the speed that puts into operation.
Accompanying drawing explanation
fig. 1 is the flow chart of the self adaptation phase sequence control method of SVG device of the present invention;
fig. 2 is the structural representation of the SVG device based on self adaptation phase sequence control method.
Embodiment
below in conjunction with drawings and Examples, the present invention is described in further details:
the present invention relates to a kind of self adaptation phase sequence control method of SVG device, wherein the structure of SVG device as shown in Figure 2, comprise A, B, C three-phase reactive compensation unit, master controller and voltage transformer, A, B, in C three-phase, every phase reactive compensation unit is connected in series by some power models, and be connected with system busbar by cable or copper bar, each power model all arranges the voltage collection circuit for gathering ac output voltage waveform, and be connected to master controller, voltage transformer primary side connected system bus, secondary side connects the data acquisition board in master controller.The self adaptation phase sequence control method of this SVG device take main controller as core, realizes data acquisition by built-in software program, and analyzing and processing also controls the output voltage phase sequence of A, B, C three-phase reactive compensation unit of SVG device; First, master controller gathers voltage transformer secondary side voltage waveform by data acquisition board, the output voltage waveforms of each power model is gathered by voltage collection circuit, and carry out addition of waveforms calculating respectively by A, B, C three-phase, then the voltage transformer secondary side voltage waveform of the voltage waveform after superposition and collection is carried out phase compare calculating, carry out phase sequence control with phase calculation result, make the system busbar voltage phase sequence of corresponding wiring phase consistent with A, B, C three-phase reactive compensation unit output voltage phase sequence of SVG device.
a self adaptation phase sequence control method for SVG device, master controller gather voltage waveform and carry out data processing, phase sequence control program circuit as shown in Figure 1, comprise following concrete steps:
1) voltage waveform signal collection
gather voltage transformer secondary side voltage waveform signal, gather the output voltage waveforms signal of all power models in SVG device A, B, C three-phase reactive compensation unit; Signals collecting adopts conventional method collection, and the central processing unit that the data of collection send into master controller through A/D conversion carries out digitized processing, obtains voltage waveform signal.Because the voltage waveform signal of voltage transformer secondary side and the voltage waveform signal of primary side are that amplitude is different, phase angle (phase sequence) is identical, therefore, the voltage waveform signal of characterization system bus can be carried out with the voltage waveform signal of voltage transformer secondary side, obtained the phase sequence information of the voltage waveform signal of system busbar by the voltage waveform signal detecting voltage transformer secondary side.
2) fundametal compoment is extracted
by the output voltage waveforms signal of all power models of step 1) collection by processing mutually, the output voltage waveforms signal often going up all power models in A, B, C three-phase is mutually carried out overlap-add procedure, as the output voltage waveforms signal of this phase, and adopt fft algorithm to extract the fundametal compoment of output voltage waveforms, obtain the fundametal compoment of output voltage waveforms of SVG device A, B, C three-phase reactive compensation unit, extract the fundametal compoment of voltage transformer secondary side voltage waveform simultaneously; A large amount of harmonic signals has been mixed in voltage waveform signal due to collection, cause the distortion of voltage waveform signal, have a strong impact on the accuracy of result, and the first-harmonic of voltage waveform signal is accurately from start to finish, therefore adopts fundametal compoment to characterize voltage waveform signal.
3) phase angle is compared (phase sequence compares)
calculation procedure 2) in extract SVG device A, the fundametal compoment phase angle of output voltage waveforms of B, C three-phase reactive compensation unit and the fundametal compoment phase angle of voltage transformer secondary side voltage waveform compare, thus show that whether the output voltage phase sequence of the SVG device three-phase reactive compensation unit of corresponding wiring phase consistent with the voltage phase sequence of voltage transformer secondary side;
4) adjustment exports phase sequence
when the output voltage phase sequence of SVG device A, B, C three-phase reactive compensation unit and the voltage phase sequence of voltage transformer secondary side inconsistent time, master controller adjusts the output voltage phase sequence of SVG device A, B, C three-phase reactive compensation unit automatically by the software simulation switch of inside, makes it consistent with the voltage phase sequence of the voltage transformer secondary side of corresponding wiring phase.
described step 2) in as follows by the process processed mutually to the output voltage waveforms signal of all power models,
after the output voltage waveforms signal of power models all in A phase is superposed, as A phase output voltage waveforms signal, fft algorithm is used to convert A phase output voltage waveforms signal, obtain the frequency domain information of A phase output voltage waveforms signal, and extract fundametal compoment from the frequency domain information of A phase output voltage waveforms signal;
after the output voltage waveforms signal of power models all in B phase is superposed, as B phase output voltage waveforms signal, fft algorithm is used to convert B phase output voltage waveforms signal, obtain the frequency domain information of B phase output voltage waveforms signal, and extract fundametal compoment from the frequency domain information of B phase output voltage waveforms signal;
after the output voltage waveforms signal of power models all in C phase is superposed, as C phase output voltage waveforms signal, fft algorithm is used to convert C phase output voltage waveforms signal, obtain the frequency domain information of C phase output voltage waveforms signal, and extract fundametal compoment from the frequency domain information of C phase output voltage waveforms signal;
the fundametal compoment process extracting the voltage waveform of voltage transformer secondary side is as follows:
the A phase voltage waveform signal of fft algorithm to voltage transformer secondary side is used to convert, obtain the frequency domain information of the A phase voltage waveform signal of voltage transformer secondary side, and extract fundametal compoment from the frequency domain information of the A phase voltage waveform signal of voltage transformer secondary side;
the B phase voltage waveform signal of fft algorithm to voltage transformer secondary side is used to convert, obtain the frequency domain information of the B phase voltage waveform signal of voltage transformer secondary side, and extract fundametal compoment from the frequency domain information of the B phase voltage waveform signal of voltage transformer secondary side;
the C phase voltage waveform signal of fft algorithm to voltage transformer secondary side is used to convert, obtain the frequency domain information of the C phase voltage waveform signal of voltage transformer secondary side, and extract fundametal compoment from the frequency domain information of the C phase voltage waveform signal of voltage transformer secondary side.
in the present invention, the self adaptation output of phase sequence adjusts is utilize the software simulation switch in master controller to realize, based on FPGA hardware and software control code in master controller, utilize the output of software control code control FPGA, thus realize the adjustment of the output voltage phase sequence of SVG device three-phase reactive compensation unit.The phase sequence control of above-mentioned phase sequence self-adaption control model is based on FPGA hardware, and this is the mode of wherein a kind of less expensive, can also adopt other passage bridge hardware and coordinate control program to control, and realizes self adaptation phase modulation and controls.
Claims (4)
1. the self adaptation phase sequence control method of a SVG device, this SVG device comprises A, B, C three-phase reactive compensation unit, master controller and voltage transformer, A, B, in C three-phase, every phase reactive compensation unit is connected in series by some power models, and be connected with system busbar by cable or copper bar, each power model all arranges the voltage collection circuit for gathering ac output voltage waveform, and be connected to master controller, voltage transformer primary side connected system bus, secondary side connects the data acquisition board in master controller, it is characterized in that: master controller gathers voltage transformer secondary side voltage waveform by data acquisition board, the output voltage waveforms of each power model is gathered by voltage collection circuit, and press A, B, C three-phase carries out addition of waveforms calculating respectively, the voltage transformer secondary side voltage waveform of the voltage waveform after superposition and collection is carried out phase compare calculating, phase sequence control is carried out with phase calculation result, make the system busbar voltage phase sequence of corresponding wiring phase and the A of SVG device, B, C three-phase reactive compensation unit output voltage phase sequence is consistent.
2. the self adaptation phase sequence control method of a kind of SVG device according to claim 1, master controller gather voltage waveform and carry out data processing, the process of phase sequence control comprises the following steps:
1) gather voltage transformer secondary side voltage waveform signal, gather the output voltage waveforms signal of all power models in SVG device A, B, C three-phase reactive compensation unit;
2) by the output voltage waveforms signal of all power models of step 1) collection by processing mutually, the output voltage waveforms signal often going up all power models in A, B, C three-phase is mutually carried out overlap-add procedure, as the output voltage waveforms signal of this phase, and adopt fft algorithm to extract the fundametal compoment of output voltage waveforms, obtain the fundametal compoment of output voltage waveforms of SVG device A, B, C three-phase reactive compensation unit, extract the fundametal compoment of voltage transformer secondary side voltage waveform simultaneously;
3) calculation procedure 2) in extract SVG device A, the fundametal compoment phase angle of output voltage waveforms of B, C three-phase reactive compensation unit and the fundametal compoment phase angle of voltage transformer secondary side voltage waveform compare, thus show that whether the output voltage phase sequence of the SVG device three-phase reactive compensation unit of corresponding wiring phase consistent with the voltage phase sequence of voltage transformer secondary side;
4) when the output voltage phase sequence of SVG device A, B, C three-phase reactive compensation unit and the voltage phase sequence of voltage transformer secondary side inconsistent time, master controller adjusts the output voltage phase sequence of SVG device A, B, C three-phase reactive compensation unit automatically, makes it consistent with the voltage phase sequence of the voltage transformer secondary side of corresponding wiring phase.
3. the self adaptation phase sequence control method of a kind of SVG device according to claim 2, is characterized in that: described step 2) in as follows by the process processed mutually to the output voltage waveforms signal of all power models,
After the output voltage waveforms signal of power models all in A phase is superposed, as A phase output voltage waveforms signal, fft algorithm is used to convert A phase output voltage waveforms signal, obtain the frequency domain information of A phase output voltage waveforms signal, and extract fundametal compoment from the frequency domain information of A phase output voltage waveforms signal;
After the output voltage waveforms signal of power models all in B phase is superposed, as B phase output voltage waveforms signal, fft algorithm is used to convert B phase output voltage waveforms signal, obtain the frequency domain information of B phase output voltage waveforms signal, and extract fundametal compoment from the frequency domain information of B phase output voltage waveforms signal;
After the output voltage waveforms signal of power models all in C phase is superposed, as C phase output voltage waveforms signal, fft algorithm is used to convert C phase output voltage waveforms signal, obtain the frequency domain information of C phase output voltage waveforms signal, and extract fundametal compoment from the frequency domain information of C phase output voltage waveforms signal;
The fundametal compoment process extracting the voltage waveform of voltage transformer secondary side is as follows:
The A phase voltage waveform signal of fft algorithm to voltage transformer secondary side is used to convert, obtain the frequency domain information of the A phase voltage waveform signal of voltage transformer secondary side, and extract fundametal compoment from the frequency domain information of the A phase voltage waveform signal of voltage transformer secondary side;
The B phase voltage waveform signal of fft algorithm to voltage transformer secondary side is used to convert, obtain the frequency domain information of the B phase voltage waveform signal of voltage transformer secondary side, and extract fundametal compoment from the frequency domain information of the B phase voltage waveform signal of voltage transformer secondary side;
The C phase voltage waveform signal of fft algorithm to voltage transformer secondary side is used to convert, obtain the frequency domain information of the C phase voltage waveform signal of voltage transformer secondary side, and extract fundametal compoment from the frequency domain information of the C phase voltage waveform signal of voltage transformer secondary side.
4. the self adaptation phase sequence control method of a kind of SVG device according to claim 2, is characterized in that:
Step 4) in, when the output voltage phase sequence of SVG device A, B, C three-phase reactive compensation unit and the voltage phase sequence of voltage transformer secondary side inconsistent time, master controller adjusts the output voltage phase sequence of SVG device A, B, C three-phase reactive compensation unit automatically by the software simulation switch of inside.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107346891A (en) * | 2016-06-14 | 2017-11-14 | 台州市劲野智能科技有限公司 | SVC with wiring error correction |
| CN112798878A (en) * | 2021-02-25 | 2021-05-14 | 山东科汇电力自动化股份有限公司 | Line transposition automatic phase sequence identification method based on voltage synchronous comparison |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4752726A (en) * | 1986-09-09 | 1988-06-21 | Kabushiki Kaisha Toshiba | Reactive power compensation device |
| CN102868169A (en) * | 2012-09-11 | 2013-01-09 | 吴加林 | Three-phase static reactive compensator based on IGBT |
| CN204230914U (en) * | 2014-10-27 | 2015-03-25 | 河北旭辉电气股份有限公司 | A kind of convenience is to the complete SVG device of phase |
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2015
- 2015-08-04 CN CN201510469224.1A patent/CN105048477B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4752726A (en) * | 1986-09-09 | 1988-06-21 | Kabushiki Kaisha Toshiba | Reactive power compensation device |
| CN102868169A (en) * | 2012-09-11 | 2013-01-09 | 吴加林 | Three-phase static reactive compensator based on IGBT |
| CN204230914U (en) * | 2014-10-27 | 2015-03-25 | 河北旭辉电气股份有限公司 | A kind of convenience is to the complete SVG device of phase |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107346891A (en) * | 2016-06-14 | 2017-11-14 | 台州市劲野智能科技有限公司 | SVC with wiring error correction |
| CN112798878A (en) * | 2021-02-25 | 2021-05-14 | 山东科汇电力自动化股份有限公司 | Line transposition automatic phase sequence identification method based on voltage synchronous comparison |
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