CN101266265B - Method for detecting high voltage frequency converter electric network voltage phase - Google Patents
Method for detecting high voltage frequency converter electric network voltage phase Download PDFInfo
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- CN101266265B CN101266265B CN2007101797317A CN200710179731A CN101266265B CN 101266265 B CN101266265 B CN 101266265B CN 2007101797317 A CN2007101797317 A CN 2007101797317A CN 200710179731 A CN200710179731 A CN 200710179731A CN 101266265 B CN101266265 B CN 101266265B
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Abstract
The invention discloses a method for testing the electricnetwork pressure phase of the high pressure transducer, comprising directly inputting the pressure at the high pressure side of the transducer by the main control system to detect and process; transmitting the signal containing the electricnetwork pressure phase information to the control chip of each power unit optical fiber; performing the calculation of the control algorithm by the control chip of each power unit based on the electricnetwork pressure phase information received from the optical fiber. The high pressure transducer with energy feedback function without network side reactor after abolishing the network side reactor, still reliably operates at high performance, therefore the cost, volume and weight of the transducer can be greatly reduced.
Description
Technical field
The present invention relates to a kind of method of detection of grid voltage-phase, specifically, the present invention relates to a kind ofly to be used to detect, have the method for the three phase network voltage-phase that many level of power unit cascade type high voltage converter of energy feedback function links to each other with network-free reactor.
Background technology
Along with the development of Power Electronic Technique, high voltage converter, is widely used as industries such as metallurgy, petrochemical industry, water supply, electric power, and is bringing into play more and more important effect in the every field of national economy as energy-saving and cost-reducing main means.
In the high voltage converter of all multiple topologies, many level of power unit cascade type high voltage converter shown in Figure 1 is because its voltage fan-out capability is strong, little to the harmonic pollution of electrical network, dv/dt to the motor output voltage is little, becomes one of the main flow of high voltage converter and optimum form.
In the practical application of many level of power unit cascade type high voltage converter,,, when controlled motor braking, its braking energy need be fed back to grid side from load-side as big inertia blower fan, mine hoist, rolling mill etc. for the load that needs electric braking.In order to make many level of power unit cascade type high voltage converter have energy feedback function, the control chip of each power cell must accurately detect the phase place of its voltage on line side, controls its current on line side.
In order to make each power cell can accurately detect the phase place of its voltage on line side so that the controlled rectification bridge inversion in the power controlling unit, with braking energy feedback to electrical network; Also identical and known for the net side inductance value that makes each power cell, reduce the difficulty of control program, as shown in Figure 1, in the prior art, usually between the secondary winding of the net side of each power cell 1 and many secondary of three-phase winding transformer 2, set up a three-phase low voltage network reactor 3.
Volume, weight and the cost that so many low voltage network reactor will increase frequency converter significantly is installed in having many level of power unit cascade type high voltage converter of energy feedback function.
In order to reduce the volume and weight of above-mentioned high voltage converter, reduce its manufacturing cost, the inventor has developed many level of power unit cascade type high voltage converter a kind of network-free reactor, that have energy feedback function through concentrating on studies, as shown in Figure 2.In the process of development, the inventor finds: behind the network reactor of having cancelled between each power cell 1 net side and the transformer 2 secondary windings, the grid side of each power cell is the power supply outgoing side of its controlled rectification bridge portion, this place's voltage is the output voltage of power cell controlled rectification bridge portion but not line voltage, the control section of each power cell can't be measured the phase place and the amplitude of line voltage, therefore, the control section of each control module can't carry out the calculating of control algolithm, also, can't realize the feedback of energy with regard to the conducting and the shutoff of each on-off element of uncontrollable formation rectifier bridge.
Summary of the invention
In view of the foregoing, the purpose of this invention is to provide and a kind ofly be used to detect, have a method of the three phase network voltage-phase that many level of power unit cascade type high voltage converter of energy feedback function links to each other with network-free reactor.
For realizing above-mentioned purpose, the present invention adopts following design proposal: a kind of method that detects high voltage frequency converter electric network voltage phase is characterized in that: it is directly frequency converter high-pressure side input voltage to be detected and handles by the frequency converter master control system; Then, will comprise the signal of electric network voltage phase information by the control chip of Optical Fiber Transmission to each power cell; Each power cell control chip carries out the calculating of control algolithm according to the electric network voltage phase information that receives from optical fiber.
That is, the present invention adopts the software locks phase method that electric network voltage phase is detected and handles, and concrete grammar is as follows:
1, at first, be line voltage by detection of frequency converter master control system and sampling frequency converter high pressure input side voltage, after the process software phase-lock loop is phase-locked, obtain the phase place of line voltage;
2, then, convert the numerical value of electric network voltage phase to serial signal, be sent to each power cell by optical fiber;
3, after each power cell is received above-mentioned serial signal, be converted into parallel signal, send the control chip in the power cell to, carry out control algolithm and calculate.
The invention has the beneficial effects as follows: the high voltage converter that makes network-free reactor with energy feedback function after having cancelled network reactor, still can high-performance the ground reliability service, thereby reduced cost, the volume and weight of frequency converter widely.
Description of drawings
Fig. 1 is the main circuit topological structure that has many level of the power unit cascade type high voltage converter with energy feedback function of network reactor;
Fig. 2 is the high voltage converter main circuit topological structure figure with energy feedback function of network-free reactor;
Fig. 3 adopts the theory diagram of the phase-locked electric network voltage phase of software phase-lock loop for master control system of the present invention;
The software phase-lock-loop algorithm block diagram that Fig. 4 adopts for master control system of the present invention;
Fig. 5 adopts the theory diagram of the phase-locked power cell decoding of software phase-lock loop fiber-optic signal for master control system of the present invention.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments, is not limitation of the invention.
Has the electric network voltage phase that many level of power unit cascade type high voltage converter of energy feedback function links to each other in order to detect with network-free reactor, the present invention directly detects frequency converter high-pressure side input voltage by frequency converter master control system 4, then, the signal that will comprise electric network voltage phase information is transferred to the control chip of each power cell 1 by optical fiber 5; Each power cell control chip carries out the calculating of control algolithm according to the electrical network phase information that receives from optical fiber, and its DC bus-bar voltage and current on line side are independently controlled.
Master control system of the present invention adopts the software locks phase method that electric network voltage phase is detected and handles, and concrete grammar is as follows:
1, at first, be line voltage by detection of frequency converter master control system and sampling frequency converter high pressure input side voltage, after the process software phase-lock loop is phase-locked, obtain the phase place of line voltage;
2, then, convert the numerical value of electric network voltage phase to serial signal, be sent to each power cell by optical fiber;
3, after each power cell is received above-mentioned serial signal, be converted into parallel signal, send the control chip in the power cell to, carry out control algolithm (as vector controlled) and calculate.
Because for some control algolithm, know that accurately the amplitude of line voltage helps to improve the dynamic property of control, therefore can calculate the amplitude of line voltage by software algorithm, together carry out the parallel-to-serial conversion, be sent to each power cell by optical fiber with phase signal.
Fig. 3 detects and handles the theory diagram of electric network voltage phase for master control system of the present invention adopts the software locks phase method.As shown in the figure, after master control system passes through electric resistance partial pressure with frequency converter high pressure input side three-phase voltage (being line voltage), obtain the three-phase low-voltage signal that phase place is identical with it, size is directly proportional, through isolating the isolation and the amplification of amplifier chip (for example ISO124 chip), obtaining can be for the three-phase voltage signal of A/D sampling thief sampling; After the A/D sampling thief carries out analog to digital conversion to this group signal, the microprocessor of transferring in the master control system carries out software phase-lock loop calculating, obtain the amplitude and the phase place of line voltage comparatively stably, pass through parallel-to-serial converter again, the phase number of line voltage is converted into serial signal, after finally being converted into light signal by the optical fiber driver, give each power cell by Optical Fiber Transmission.
Fig. 4 is a kind of implementation of software phase-lock loop of the present invention.As shown in the figure, at first, the instantaneous value of the three phase network voltage of master control system microprocessor after with A/D sampling thief analog to digital conversion obtains the line voltage instantaneous value under the polar coordinate system, i.e. the instantaneous value of the amplitude of line voltage and phase place through the mathematic(al) manipulation of rectangular coordinate system → polar coordinate system;
Then, the amplitude instantaneous value of line voltage by after the low-pass filter filtering, is obtained metastable line voltage amplitude, be sent to parallel-to-serial converter;
The phase place instantaneous value and the software phase-lock loop phase place of line voltage are exported the poor of instantaneous value,, be transferred to proportional-integral controller (pi regulator) as the phase control error of phaselocked loop; With the output and predefined mains frequency reference value (is 50Hz in the China) addition of regulator, obtain the frequency of current phaselocked loop again; Phase-locked loop frequency is carried out integration promptly obtain electric network voltage phase after phase-locked, the numerical value with this phase place is sent to parallel-to-serial converter then, and then is sent to each power cell with filtered line voltage amplitude by optical fiber.
The theory diagram that Fig. 5 decodes to the fiber-optic signal that receives for each power cell.As shown in the figure, after each power cell receives fiber-optic signal, by photoelectric commutator it is carried out the electric signal that opto-electronic conversion obtains serial, this signal comprises the amplitude information and the phase information of line voltage; After again this signal being changed through the serial-to-parallel converter, the line voltage amplitude signal and the phase signal that obtain walking abreast; After microprocessor chip on the power cell (being the control chip of power cell) takes out these two signals from the serial-to-parallel converter, carry it into the calculation procedure of controlled rectifier control algolithm, calculate accurately.
The method that also has a kind of equivalence is that master control system directly passes through parallel-to-serial converter with the three phase network instantaneous voltage that samples, and converts serial signal to, is sent on each power cell by optical fiber again.Above-mentioned software phase-lock loop program is responsible for execution by the microprocessor chip on each power cell.
The advantage of above-mentioned software phase-lock loop is to calculate accurately, and when detected mains voltage signal was interfered, the line voltage amplitude of its output was relative with electric network voltage phase steady, finally makes the controlled rectification bridge stable working of each power cell.
In addition, also have some other method, according to the line voltage numerical value that samples, directly calculate electric network voltage phase, deliver to power cell, calculate its phase place or the like voluntarily by power cell, because length is limit and can not be enumerated by optical fiber as master control system.
The common ground of these methods is: master control system detects frequency converter high-pressure side input voltage (being three phase network voltage), and then, the signal that will comprise electric network voltage phase information is sent to each power cell by optical fiber.
The invention has the beneficial effects as follows: make the high voltage converter with energy feedback function of network-free reactor after having cancelled network reactor, still can high-performance the ground reliability service, thereby reduced widely cost, the volume and weight of frequency converter.
Claims (6)
1. method that detects high voltage frequency converter electric network voltage phase, many level of the power unit cascade type high voltage converter that has energy feedback function at network-free reactor designs, and it is characterized in that: it is directly frequency converter high-pressure side input voltage to be detected and handles by the frequency converter master control system; Then, will comprise the signal of electric network voltage phase information by the control chip of Optical Fiber Transmission to each power cell; Each power cell control chip carries out the calculating of control algolithm according to the electric network voltage phase information that receives from optical fiber.
2. the method for detection high voltage frequency converter electric network voltage phase according to claim 1, it is characterized in that: described frequency converter master control system detects and sampling frequency converter high pressure input side voltage, after the process software phase-lock loop is phase-locked, obtain comprising the information of electric network voltage phase.
3. the method for detection high voltage frequency converter electric network voltage phase according to claim 2, it is characterized in that: the phase-locked master control system microprocessor that is meant of described software passes through the three phase network instantaneous voltage that samples the mathematic(al) manipulation of rectangular coordinate system → polar coordinate system, obtain the line voltage instantaneous value under the polar coordinate system, i.e. the instantaneous value of the amplitude of line voltage and phase place;
Then, the amplitude instantaneous value of line voltage by after the low-pass filter filtering, is obtained metastable line voltage amplitude, be sent to parallel-to-serial converter;
The phase place instantaneous value and the software phase-lock loop phase place of line voltage are exported the poor of instantaneous value, and the phase control error as phaselocked loop is transferred to proportional-integral controller; With the output and the addition of predefined mains frequency reference value of regulator, obtain the frequency of current phaselocked loop again; Phase-locked loop frequency is carried out integration promptly obtain electric network voltage phase after phase-locked, the numerical value with this phase place is sent to parallel-to-serial converter then, and then is sent to each power cell with filtered line voltage amplitude by optical fiber.
4. according to the method for claim 2 or 3 described detection high voltage frequency converter electric network voltage phases, it is characterized in that: the numerical value that described frequency converter master control system will comprise electric network voltage phase converts serial signal to, after finally being converted into light signal by the optical fiber driver again, give each power cell by Optical Fiber Transmission.
5. the method for detection high voltage frequency converter electric network voltage phase according to claim 4, it is characterized in that: after described each power cell is received above-mentioned serial signal, be converted into parallel signal, send the control chip in the power cell to, carry out control algolithm and calculate.
6. the method for detection high voltage frequency converter electric network voltage phase according to claim 5, it is characterized in that: after described each power cell receives fiber-optic signal, by photoelectric commutator it is carried out the electric signal that opto-electronic conversion obtains serial, this signal comprises the phase information of line voltage; After again this signal being changed through the serial-to-parallel converter, the signal that comprises electric network voltage phase that obtains walking abreast; Microprocessor chip on the power cell carries it into the calculation procedure that comprises control algolithm after taking out this signal from the serial-to-parallel converter, calculates accurately.
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| CN101833037B (en) * | 2010-05-06 | 2012-04-11 | 广州智光电气股份有限公司 | Device and method for detecting input voltage phase of power unit of high voltage frequency converter |
| CN102169137B (en) * | 2011-01-12 | 2014-08-06 | 株洲变流技术国家工程研究中心有限公司 | Signal processing method and measuring device for high-voltage frequency converter |
| CN103575990B (en) * | 2012-07-26 | 2016-02-03 | 南京邮电大学 | A kind of method of instantaneous phase of digitized measurement alternating current |
| CN103575991B (en) * | 2012-07-26 | 2016-02-10 | 南京邮电大学 | A kind of accurate measurement method of instantaneous phase of alternating current |
| CN103344815B (en) * | 2013-06-08 | 2015-08-19 | 中国农业大学 | A kind of measurement of electric parameter method and system of wide region change |
| CN105588981A (en) * | 2016-01-13 | 2016-05-18 | 江苏昂内斯电力科技股份有限公司 | Power grid phase-lock method based on low-pass wave trapper |
| CN107968403A (en) * | 2017-12-15 | 2018-04-27 | 广州智光电气股份有限公司 | The power unit direct voltage control device and method of tandem type high voltage converter |
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| CN1738144A (en) * | 2005-09-01 | 2006-02-22 | 上海交通大学 | Single-phase transformer four-layer IGBT type dynamic reactive compensator |
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