CN201134680Y - Intelligent low-voltage reactive power autocompensating controller - Google Patents
Intelligent low-voltage reactive power autocompensating controller Download PDFInfo
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- CN201134680Y CN201134680Y CNU2007203034575U CN200720303457U CN201134680Y CN 201134680 Y CN201134680 Y CN 201134680Y CN U2007203034575 U CNU2007203034575 U CN U2007203034575U CN 200720303457 U CN200720303457 U CN 200720303457U CN 201134680 Y CN201134680 Y CN 201134680Y
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model discloses an intelligent type low-voltage reactive power automatic compensate controller, which is characterized in that a high-speed digital signal processor is used as a core, the high-speed arithmetic capability of the digital signal processor is utilized to achieve multi-parameter comprehensive control of voltage, current flow, power and power factor, when the simplification of periphery hardware circuit design is achieved through utilizing digital calibration, digital filter, program logic judgment, and the production cost is lowered, the precision, reliability and anti-interference capacity of the controller are improved.
Description
Technical field
The utility model relates to a kind of intelligent type low-voltage reactive power automatic compensation control device, belongs to low-voltage electrical apparatus manufacturing technology field.
Background technology
Low-voltage reactive power power automatic compensating controller is regulated reactive current in the power distribution network by control compensation electric capacity, have reduce line loss, energy savings, stablize line voltage, effect such as increase transformer capacity, be widely used in the distribution system.But existing controller substantially all adopts Single-chip Controlling, because its arithmetic speed is low, can't realize complicated control algolithm, some can only be used the peripheral hardware circuit and realize, exists shortcomings such as circuit structure complexity, low precision, cost height, poor anti jamming capability.For example, normally used phase judgment method adopts comparator to discern the zero crossing of voltage and current, obtains the time difference (being phase difference) between their zero crossings, thereby can calculate power factor.Yet the existence of these hardware circuits has not only improved the cost of controller greatly, and is easy to be subjected to the influence of factors such as harmonic wave, null offset, makes the Performance And Reliability of controller reduce greatly.
Summary of the invention
In view of the problem that above-mentioned technology exists, the utility model purpose provides the intelligent type low-voltage reactive power self-compensating controlling device that a kind of circuit structure is simple, precision is high, cost is low, antijamming capability is good.
Technical solution adopted in the utility model is:
With low-cost high speed digital signal processor is core, simplify the peripheral hardware circuit, adopt digital calibration precision, digital filtering to improve precision and anti-interference, realize the calculating of power factor with high speed acquisition and computing, adopt complicated control algolithms such as multi-parameter comprehensive control, design the intelligent type low-voltage reactive power self-compensating controlling device.
Its concrete structure: with the high speed digital signal processor is core, include sample circuit, parts such as frequency tracking circuit, LCD/LED display circuit, building-out capacitor control output driving circuit, EEPROM, keyboard, digital calibration switch, communication interface circuit, Switching Power Supply.Sample circuit is converted into small-signal with line voltage and electric current and links to each other with digital signal processor A/D mouth after raising level, low-pass filtering, amplitude limit, the voltage small-signal links to each other with digital signal processor high-speed capture mouth through frequency tracking circuit, the level of raising in the sample circuit is formed by electric resistance partial pressure, raises level and links to each other with digital signal processor A/D mouth simultaneously; LCD/LED display circuit, building-out capacitor control output driving circuit link to each other with digital signal processor I/O mouth with keyboard; The digital calibration switch links to each other with digital signal processor I/O port, when closed this switch activated digital calibration program, calibration parameter is stored in EEPROM; The I of EEPROM and digital signal processor
2The C mouth links to each other; The communication interface circuit links to each other with the UART mouth of digital signal processor; Switching Power Supply provides power supply for entire controller.
Digital signal processor processes speed reaches 60MIPS, has 16 tunnel 12 ADC, the 32kB program space, 12kB ram space, inner watchdog circuit, internal reference circuit, timer internal, high-speed capture port, I
2C SPI UART interface etc.
The utility model technology through after the above-mentioned design compared with prior art, has the following advantages:
1, utilize digital signal processor high-speed computation ability and logic determines ability, realize the automatic identification of electric current the same phase and name by software, the phase place of saving hardware circuit is judged, saves cost, has been improved reliability.
2, utilize digital signal processor high-speed computation ability, by digital filtering and digital calibration, sample circuit only needs simple low-pass filtering and amplitude limiting processing can realize high accuracy, saves the adjusting and the filtering of hardware circuit, improves reliability and antijamming capability.
3, digital signal processor carries out behind 32 frequency divisions or 64 frequency divisions A/D being carried out the cycle data acquisition according to the frequency that frequency tracker detects, and can change from the motion tracking mains frequency, applicable to 50Hz or 60Hz electrical network.
4, utilize digital signal processor high-speed computation ability, parameters such as line voltage, electric current, power are carried out real effective to be calculated, parameter control switching circuit such as energy integrated voltage, electric current, power, power factor (PF) carry out switching, the various defectives of avoiding single parameter control to exist.
Description of drawings
Accompanying drawing 1 is the schematic block circuit diagram of this novel practical.
The schematic block circuit diagram of a kind of embodiment of accompanying drawing 2 novel practical intelligent type low-voltages reactive power self-compensating controlling device.
Wherein:
1---represents sample circuit; 2---represents frequency tracking circuit;
3---represents digital signal processor; 4---represents the LCD/LED display module;
5---represents building-out capacitor control output driving circuit;
6---represents eeprom memory; 7---represents the keyboard input module
8---represents the digital calibration switch; 9---represents the communication interface circuit
10---represents switch power module.
Embodiment:
Below in conjunction with accompanying drawing, specific embodiments of the present utility model is described in further detail:
Intelligent type low-voltage reactive power self-compensating controlling device described in the utility model, it is formed as shown in Figure 1, with high speed digital signal processor 3 is core, includes parts such as sample circuit 1, frequency tracking circuit 2, LCD/LED display circuit 4, building-out capacitor control output driving circuit 5, EEPROM6, keyboard 7, digital calibration switch 8, communication interface circuit 9, Switching Power Supply 10.Sample circuit 1 is converted into small-signal with the line voltage electric current and links to each other with the A/D port of digital signal processor 3 after raising level, low-pass filtering, amplitude limit, link to each other with frequency tracking circuit 2 simultaneously, frequency tracking circuit 2 is caught mouth with digital signal processor 3 and is linked to each other; LCD/LED display circuit (4), building-out capacitor control output driving circuit (5) link to each other with the I/O mouth of digital signal processor 3 with keyboard (7); The I of EEPROM6 and digital signal processor 3
2The C mouth links to each other; Switching Power Supply 10 provides power supply for entire controller.Wherein storing working procedures such as digital filtering, digital calibration, control algolithm in the memory of digital signal processor 3.
As shown in Figure 2: the intelligent type low-voltage reactive power self-compensating controlling device core of present embodiment adopts TI company up-to-date release low-cost and high-performance digital signal processor (DSP) TMS320F28015, it has 100 pins, have 16 tunnel 12 A/D port (AN0～AN7, BN0～BN7), two-way high-speed capture port (ECAP1, ECAP2), I2C interface SDA and SCL, communication interface SCIRXDA and SCIRXDA, 34 general purpose I/O interfaces (GPIO00-GPIO34 comprises and shows that I/O interface and output drive the I/O interface).
Sample circuit (1) is by voltage signal change-over circuit, current signal change-over circuit and raise level circuit and form, and raises level circuit and is formed by resistance R 5 and R6 dividing voltage supply voltage VCC, raises level and links to each other with the A/D port of digital signal processor 3 simultaneously; Its magnitude of voltage is near 1/2 of digital signal processor 3 internal reference voltages, capacitor C 3 carries out linking to each other with A/D mouth AN7, voltage signal change-over circuit, current signal change-over circuit, the frequency tracking circuit of digital signal processor 3 after the simple and easy filtering, because the voltage and current signal is ambipolar, on hardware, they are converted to unipolar A/D mouth electrical characteristic (it specifically acts in the algorithm and describes) that satisfies digital signal processor 3 by half that raise full scale.The voltage signal change-over circuit with high pressure through resistance R 0, instrument transformer PT1, resistance R 1 with raise level circuit and convert the low voltage signal that digital signal processor (3) A/D mouth can bear to, through resistance R 2 and capacitor C 1 low-pass filtering, and link to each other with the A/D mouth AN0 of digital signal processor 3 by behind diode D1 and the D2 amplitude limit.The current signal change-over circuit with big electric current through instrument transformer CT1, resistance R 3 with raise the low voltage signal that A/D mouth that level circuit converts digital signal processor 3 to can bear, through resistance R 4 and capacitor C 2 low-pass filtering, and link to each other with the A/D mouth BN0 of digital signal processor 3 by behind diode D3 and the D4 amplitude limit.The only routine A phase wherein of voltage and current signal change-over circuit in this example, other two-phase modes are identical.
The resistance R 9 of digital calibration switch 8 and jumper switch K1 form, digital calibration switch 8 also links to each other with the universaling I/O port GPIO30 of digital signal processor 3, when jumper switch is opened, digital signal processor 3 is by normal control program operation, when jumper switch is closed, digital signal processor 3 starts the digital calibration program that embeds, show the calibration menu, this moment is to controller input standard signal, select calibration parameter (as voltage by button, electric current etc.), proportionality coefficient k and side-play amount b deposit EEPROM (6) between digital calibration Automatic Program calculating sampling result and the standard value, open jumper switch after parametric calibration is finished, system re-powers the back by normal control program operation (calibration parameter is used in the following control algolithm and describes).
(S1～S7), resistance (R11-R14), form links to each other with the universaling I/O port of digital signal processor 3 by electric capacity (C11-C14) by button for keyboard 7.Eeprom chip IC2 adopts 24LC04B, and communication interface circuit 9 adopts band isolation features RS-485 communication chip ADM2483BRW.LCD/LED display circuit 4, building-out capacitor control output driving circuit 5 link to each other with the universaling I/O port of keyboard 7 with digital signal processor 3.This partial circuit adopts the techniques well known design, and present embodiment is not done detailed description.
Some algorithms that present embodiment is related and control are described:
Wherein: k is that calibration procedure is stored in the proportionality coefficient among the EEPROM (6);
B is that calibration procedure is stored in the side-play amount among the EEPROM (6);
U (n), i (n) are that digital signal processor 3 is gathered n point voltage, current value;
Ref is that digital signal processor 3 collection is raised level value, is the unipolarity value owing to raise the electric current and voltage data of gathering the back, raises level value and is reduced into bi-polar value so the data that need to gather deduct collection;
N is always counting of gathering in the cycle, is 64 points in this example;
Which some n gathers in the cycle.
Phase judgment is handled because low voltage reactive power compensation equipment is used for terminal electricity consumption user, active power be certainly on the occasion of, based on this principle, as meritorious power P is negative value, and then terminal block phase place is wrong certainly, needs controller to adjust phase place automatically so that correct control.Concrete differentiate be when meritorious power be timing, be perception if reactive power is a canonical; Otherwise be capacitive; When meritorious power when negative, if reactive power is for negative then be perceptual; Otherwise be capacitive.Method of discrimination by software saves hardware circuit, reduces production costs and improves product reliability.
Above-mentioned voltage, electric current, power only are the monocycle calculated value in this example, and for preventing accidental interference, system adopts it and on average is used for for 10 times showing and control.
Claims (3)
1, a kind of intelligent type low-voltage reactive power self-compensating controlling device, it is characterized in that this intelligent type low-voltage reactive power self-compensating controlling device is a core with high speed digital signal processor (3), include sample circuit (1), frequency tracking circuit (2), LCD/LED display circuit (4), building-out capacitor control output driving circuit (5), EEPROM (6), keyboard input (7), digital calibration switch (8), communication interface circuit (9), Switching Power Supply (10), sample circuit (1) is with line voltage and electric current is converted into small-signal and through raising level, low-pass filtering, A/D port with digital signal processor (3) behind the amplitude limit links to each other, link to each other with frequency tracking circuit (2) simultaneously, frequency tracking circuit (2) links to each other with the seizure mouth of digital signal processor (3); LCD/LED display circuit (4), building-out capacitor control output driving circuit (5) link to each other with the I/O mouth of keyboard (7) with digital signal processor (3), the I of EEPROM (6) and digital signal processor (3)
2The C mouth links to each other, and Switching Power Supply (10) provides power supply for entire controller.
2, intelligent type low-voltage reactive power self-compensating controlling device according to claim 1 is characterized in that the level of raising in the described sample circuit (1) is formed by electric resistance partial pressure, raises level and links to each other with digital signal processor (3) A/D port simultaneously.
3, intelligent type low-voltage reactive power self-compensating controlling device according to claim 1, it is characterized in that described digital calibration switch (8) resistance R 9 and jumper switch K1 form, digital calibration switch (8) also links to each other with digital signal processor (3) universaling I/O port GPIO30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007203034575U CN201134680Y (en) | 2007-12-27 | 2007-12-27 | Intelligent low-voltage reactive power autocompensating controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2007203034575U CN201134680Y (en) | 2007-12-27 | 2007-12-27 | Intelligent low-voltage reactive power autocompensating controller |
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| CN201134680Y true CN201134680Y (en) | 2008-10-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231525A (en) * | 2011-06-28 | 2011-11-02 | 思源清能电气电子有限公司 | Voltage quality control (VQC) system based on static var generator(SVG) and method thereof |
| CN102402191A (en) * | 2011-11-03 | 2012-04-04 | 珠海博威智能电网有限公司 | High voltage switch controller with automatic calibration function |
| CN104318836A (en) * | 2014-11-04 | 2015-01-28 | 江苏工程职业技术学院 | Computer-controlled power factor compensation demonstration and experiment device and experiment method |
-
2007
- 2007-12-27 CN CNU2007203034575U patent/CN201134680Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231525A (en) * | 2011-06-28 | 2011-11-02 | 思源清能电气电子有限公司 | Voltage quality control (VQC) system based on static var generator(SVG) and method thereof |
| CN102402191A (en) * | 2011-11-03 | 2012-04-04 | 珠海博威智能电网有限公司 | High voltage switch controller with automatic calibration function |
| CN104318836A (en) * | 2014-11-04 | 2015-01-28 | 江苏工程职业技术学院 | Computer-controlled power factor compensation demonstration and experiment device and experiment method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Suzhou Xingzhou Transformer Co., Ltd. Assignor: Zhijiang Switch Co., Ltd., Hangzhou Contract record no.: 2010320000249 Denomination of utility model: Intelligent low-voltage reactive power autocompensating controller Granted publication date: 20081015 License type: Exclusive License Record date: 20100317 |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081015 Termination date: 20131227 |