CN101266264A - Method for detecting network-free reactor high voltage frequency converter electric network voltage phase - Google Patents
Method for detecting network-free reactor high voltage frequency converter electric network voltage phase Download PDFInfo
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- CN101266264A CN101266264A CNA2007101797302A CN200710179730A CN101266264A CN 101266264 A CN101266264 A CN 101266264A CN A2007101797302 A CNA2007101797302 A CN A2007101797302A CN 200710179730 A CN200710179730 A CN 200710179730A CN 101266264 A CN101266264 A CN 101266264A
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Abstract
The invention discloses a method for testing the electricnetwork pressure phase of the high pressure transducer without network side reactor, comprising: the high pressure input side pressure namely electricnetwork pressure being subjected to zero cross balancing by an analog comparator and obtaining a square wave in the same phase with the electricnetwork pressure by the main control system of the transducer; locking phase by a phase locked loop chip to obtain a stable square wave output; sending the square wave to each power unit by the optical fiber; each power unit receiving the optical fiber signal and obtaining the phase of the electricnetwork pressure by calculating the frequency and phase of the square wave. 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, and it may further comprise the steps:
A, frequency converter master control system directly detect and handle frequency converter high-pressure side input voltage;
B, the signal that will comprise electric network voltage phase information are given the control chip of each power cell by Optical Fiber Transmission;
C, each power cell control chip carry 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.
Concrete steps are as follows:
At first, be line voltage by the frequency converter master control system with detected frequency converter high pressure input side voltage, carried out zero balancing by analog comparator, obtain a square wave with the line voltage homophase;
Then, undertaken phase-lockedly by phase-locked loop chip, obtain a stable square wave output, this square wave is corresponding with the phase place of line voltage;
Again this square wave is sent to each power cell by optical fiber;
At last, after each power cell was received this fiber-optic signal, the control chip of each power cell utilized this value that separately DC bus-bar voltage and current on line side are independently accurately controlled by the frequency of calculating square wave and the phase place that phase place obtains line voltage.
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 hardware phase-locked-loop for 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 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 phase place of hardware phase-lock mode detection of grid voltage, and concrete grammar is as follows:
At first, be line voltage by the frequency converter master control system with detected frequency converter high pressure input side voltage, carried out zero balancing by analog comparator, obtain a square wave with the line voltage homophase;
Then, undertaken phase-lockedly by phase-locked loop chip, obtain a stable square wave output, this square wave is identical with the frequency of line voltage, and the angle that the phase phasic difference is fixing is spent or the like as 0 degree, 15;
Again this square wave is sent to each power cell by optical fiber;
At last, after each power cell is received this fiber-optic signal, the control chip of each power cell utilizes this value that separately DC bus-bar voltage and current on line side are independently accurately controlled by the frequency of measuring square wave and frequency and the phase place that phase place obtains line voltage.Concrete grammar is: the control chip of each power cell is by counting to get the cycle and the frequency of square-wave signal to the reference clock source signal in the complete cycle of square-wave signal, this frequency is numerically equal to the frequency of line voltage; By rising edge or negative edge the value of reference clock source counter is demarcated the phase place that obtains square-wave signal, the phase place numerically equal of this phase place and line voltage or differ a constant at square-wave signal.Control chip will independently accurately be controlled its DC bus-bar voltage and current on line side by the frequency and the phase place substitution control algolithm of the detected line voltage of this method.
Fig. 3 detects and the theory diagram of handling electric network voltage phase for master control system of the present invention adopts the hardware phase-lock mode.As shown in the figure, behind a certain phase voltage process electric resistance partial pressure of master control system with frequency converter high pressure input side, obtain the low-voltage signal that phase place is identical with it, size is directly proportional; This low-voltage signal is carried out hardware by the Schmidt trigger chip cross zero balancing, obtain the identical square-wave signal of phase place with it; This square-wave signal is transferred to phase-locked loop chip after light-coupled isolation, CD4046 chip for example obtains the square-wave signal of hardware after phase-locked, and this signal is corresponding with electric network voltage phase, and when detected line voltage was interfered, this signal was steady relatively; After converting this signal to light signal by the optical fiber driver, be sent to each power cell by optical fiber.
After each power cell receives this fiber-optic signal, be converted into electric signal earlier, export to microprocessor chip in the power cell, microprocessor chip in the power cell carries out cycle and the frequency that timing can obtain line voltage to the cycle of this electric signal, and being sampled in the edge of this electric signal to obtain the phase place of line voltage.
In addition, also has some other method, as master control system according to the line voltage numerical value that samples, directly calculate electric network voltage phase, by optical fiber deliver to power cell, master control system is directly sent to power cell by optical fiber with the line voltage numerical value that samples, calculate its phase place or the like voluntarily by power cell, because length is limit and can not be enumerated.
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.Because the waveform and the stability of general high voltage side line voltage all are reasonable, also better with the decoupling zero characteristic of the output voltage of the controlled rectification bridge portion of power cell, therefore after these class methods have effectively solved the cancellation network reactor, the problem that electric network voltage phase is measured.
The invention has the beneficial effects as follows: the high voltage converter with energy feedback function that makes no net reactor After having cancelled the net reactor, still can high-performance the ground reliability service, thereby reduced widely frequency converter Cost, volume and weight.
Claims (4)
1, a kind of method that detects network-free reactor high voltage frequency converter electric network voltage phase, it is characterized in that: it may further comprise the steps:
A, frequency converter master control system directly detect and handle frequency converter high-pressure side input voltage;
B, the signal that will comprise electric network voltage phase information are given the control chip of each power cell by Optical Fiber Transmission;
C, each power cell control chip carry 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.
2, the method for detection network-free reactor high voltage frequency converter electric network voltage phase according to claim 1 is characterized in that: described steps A further may further comprise the steps:
A1, frequency converter master control system carried out zero balancing with detected frequency converter high pressure input side voltage by analog comparator, obtained a square wave with the line voltage homophase;
A2, undertaken phase-lockedly by phase-locked loop chip, obtain a stable square wave output, this square wave is corresponding with the phase place of line voltage.
3, the method for detection network-free reactor high voltage frequency converter electric network voltage phase according to claim 2 is characterized in that: described step B is meant that the described square wave that will include electric network voltage phase information is sent to each power cell by optical fiber.
4, the method for detection network-free reactor high voltage frequency converter electric network voltage phase according to claim 3 is characterized in that: the control chip of each power cell is by the frequency of calculating square wave and the phase place that phase place obtains line voltage among the described step C; Concrete grammar is:
After each power cell receives this fiber-optic signal, be converted into electric signal earlier, export to microprocessor chip in the power cell;
Microprocessor chip in the power cell carries out cycle and the frequency that timing can obtain line voltage to the cycle of this electric signal, and being sampled in the edge of this electric signal to obtain the phase place of line voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101797302A CN101266264A (en) | 2007-12-17 | 2007-12-17 | Method for detecting network-free reactor high voltage frequency converter electric network voltage phase |
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| CNA2007101797302A CN101266264A (en) | 2007-12-17 | 2007-12-17 | Method for detecting network-free reactor high voltage frequency converter electric network voltage phase |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833037A (en) * | 2010-05-06 | 2010-09-15 | 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 |
| WO2017139926A1 (en) * | 2016-02-17 | 2017-08-24 | 深圳市英威腾电气股份有限公司 | Method and system for detecting dc zero bias of inverter output current |
| CN108375720A (en) * | 2018-03-29 | 2018-08-07 | 广东电网有限责任公司 | A kind of phase frequency tracing system for partial discharge test |
-
2007
- 2007-12-17 CN CNA2007101797302A patent/CN101266264A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833037A (en) * | 2010-05-06 | 2010-09-15 | 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 |
| 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 |
| WO2017139926A1 (en) * | 2016-02-17 | 2017-08-24 | 深圳市英威腾电气股份有限公司 | Method and system for detecting dc zero bias of inverter output current |
| CN107430173A (en) * | 2016-02-17 | 2017-12-01 | 深圳市英威腾电气股份有限公司 | The detection method and system of a kind of output current direct current zero bias of frequency converter |
| CN107430173B (en) * | 2016-02-17 | 2019-12-03 | 深圳市英威腾电气股份有限公司 | A kind of detection method and system of the output current DC zero bias of frequency converter |
| CN108375720A (en) * | 2018-03-29 | 2018-08-07 | 广东电网有限责任公司 | A kind of phase frequency tracing system for partial discharge test |
| CN108375720B (en) * | 2018-03-29 | 2023-04-28 | 广东电网有限责任公司 | Phase frequency tracking system for partial discharge test |
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