CN101540496B - Measuring and protecting device of output current of chain-type inverter - Google Patents
Measuring and protecting device of output current of chain-type inverter Download PDFInfo
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- CN101540496B CN101540496B CN200910083237XA CN200910083237A CN101540496B CN 101540496 B CN101540496 B CN 101540496B CN 200910083237X A CN200910083237X A CN 200910083237XA CN 200910083237 A CN200910083237 A CN 200910083237A CN 101540496 B CN101540496 B CN 101540496B
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Abstract
The invention relates to a measuring and protecting device of the output current of a chain-type inverter, belonging to the technical field of electric automation equipment. The measuring and protecting device comprises a current sensor used for measuring the output current of the chain-type inverter, an A/D converter and an overcurrent protector used for converting received signals into digital signals and for comparing the signals with set overcurrent-protecting signals, an FPGA used for encoding the signals and converting the signals into series communication data signals, an optical fibre driver used for converting the series communication data signals into light signals, and an isolated voltage-regulating power supply used for supplying power to modules. In the device of the invention, a primary edge and a secondary edge of the current sensor bear the withstand voltage of the maximum output voltage of a chain node power module, thereby solving the withstand voltage problem of the sensor. The output current and the overcurrent protecting signals are sampled by the FPGA and the measured current and overcurrent protecting data are transmitted by optical fibre in a series communication way, thereby realizing high-speed sampling and overcurrent protection to meet the requirements of real-time feedback and control of the output current.
Description
Technical field
The present invention relates to a kind of output current of chain-type inverter and measure and protective device, belong to the electric automatization equipment technical field.
Background technology
Chain-type inverter is also referred to as H bridge series connection converter, this converter is in series by the interchange output of a plurality of chain link modules (or claiming single-phase H bridge converter module), can be widely used in the various convertor assemblys, as high voltage variable frequency speed regulator, novel STATCOM (STATCOM), generation of electricity by new energy inverter, dynamic electric voltage recovery device (DVR), active filter (APF) etc.
Because the application scenario (3kV-35kV) that chain-type inverter is usually used in exporting higher alternating voltage makes its output current measure and the output current protection becomes difficult.When adopting Hall current sensor to measure its output current, be subjected to the restriction of the former secondary dielectric voltage withstand of Hall current sensor, can't directly measure the output current of the chain-type inverter of high voltage application scenario.And it is higher to adopt high-tension current inductor to cause measuring cost.In addition, this output current may be used for FEEDBACK CONTROL, needs to adopt very high sampling rate.Therefore, need to seek a kind of new measurement and output current protective device.
Summary of the invention
The objective of the invention is to propose a kind of output current of chain-type inverter and measure and protective device, overcome the deficiency of prior art, to solve the quick measurement and the protection problem of high-voltage chain type converter output current.
The output current of chain-type inverter that the present invention proposes is measured and protective device, comprising: current sensor, A/D converter and overcurrent protector, field programmable gate array chip, optical fiber driver and isolation stabilized voltage power supply; Wherein,
Current sensor is used to measure the output current of chain-type inverter;
A/D converter and overcurrent protector, A/D converter receives above-mentioned current measurement signal, and convert digital signal to, receive the control signal of field programmable gate array chip simultaneously, overcurrent protector compares current measurement signal and overcurrent protection setting signal, and the overcurrent protection signal is sent to field programmable gate array chip;
Field programmable gate array chip receives current measurement digital signal and overcurrent protection signal from A/D converter and overcurrent protector, signal is encoded and is converted the serial communication data-signal to, and signal is sent to the optical fiber driver;
The optical fiber driver is used for converting the serial communication data-signal of above-mentioned reception to light signal, sends in the optical fiber;
Isolate stabilized voltage power supply, be used to current sensor, A/D converter and overcurrent protector, field programmable gate array chip and optical fiber driver that stabilized voltage power supply is provided.
The output current of chain-type inverter that the present invention proposes is measured and protective device, its advantage is: former limit and the secondary of measuring the current sensor of chain-type inverter only need bear the withstand voltage of a chain link power model maximum output voltage, have solved the problem of withstand voltage of transducer; By field programmable gate array (hereinafter to be referred as FPGA) sampling output current and overcurrent protection signal and carry out serial communication by optical fiber and transmit measured electric current and overcurrent protection data; can realize sampling and overcurrent protection at a high speed, satisfy the needs of real-time FEEDBACK CONTROL output current.Therefore this invention can solve the quick measurement and the protection problem of high-voltage chain type converter output current effectively.
Description of drawings
Fig. 1 is the circuit block diagram of the current sensor of apparatus of the present invention when adopting Hall current sensor.
Fig. 2 is the circuit block diagram of the current sensor of apparatus of the present invention when adopting the common current instrument transformer.
Embodiment
The output current of chain-type inverter that the present invention proposes is measured and protective device, and its structure comprises as shown in Figure 1: current sensor (1), A/D converter and overcurrent protector (2), fpga chip (3), optical fiber driver (4) and isolation stabilized voltage power supply (5).
Above-mentioned current sensor (1) is used to measure the output current of chain-type inverter; it be installed on for above-mentioned isolation stabilized voltage power supply (5) provide the input power supply the chain link module by; an ac output end line of this chain link module directly passes the former limit measured hole of described current sensor (1), and the secondary output signal of above-mentioned current sensor (1) is connected to above-mentioned A/D converter and overcurrent protector (3).Above-mentioned current sensor (1) can adopt common current instrument transformer (as shown in Figure 2) or Hall current sensor (as shown in fig. 1).
A/D converter in above-mentioned A/D converter and the overcurrent protector (2) receives the control of above-mentioned fpga chip (3) output signal, and converts current measurement signal to digital signal, exports to above-mentioned fpga chip (3); Overcurrent protector compares current measurement signal and overcurrent protection setting signal and output overcurrent guard signal and gives above-mentioned fpga chip (3).
Above-mentioned fpga chip (3) will be encoded and convert the serial communication data-signal to from the current measurement digital signal of above-mentioned A/D converter and overcurrent protector (2) and overcurrent protection signal, convert light signal to by above-mentioned optical fiber driver (4) and send in the optical fiber.
The input (DC+/DC-) of above-mentioned isolation stabilized voltage power supply (5) is from any chain link module of chain-type inverter, and it is output as above-mentioned current sensor (1), A/D converter and overcurrent protector (2), fpga chip (3) and optical fiber driver (4) stabilized voltage power supply is provided.
In apparatus of the present invention, the model that A/D converter can adopt AD company to produce is the device of AD7864-1; The model that overcurrent protector can adopt TI company to produce is the device of LM393; Fpga chip can adopt the device of XC2S50-TQ144 of the production of XILINX company; Optical fiber driver (4) (HFBR1521Z of the SN75452 of TI company and AVAGO company)
Above-mentioned fpga chip (3) will be encoded and convert the serial communication data-signal to from the current measurement digital signal of above-mentioned A/D converter and overcurrent protector (2) and overcurrent protection signal, send in the optical fiber by the above-mentioned light signal that converts to.
The present invention also can be applicable to other similar high-tension circuit current measurement application scenarios.Any equivalent transformation circuit of doing based on circuit of the present invention all belongs to protection scope of the present invention.
Claims (1)
1. an output current of chain-type inverter is measured and protective device, it is characterized in that this protective device comprises: current sensor, A/D converter and overcurrent protector, field programmable gate array chip, optical fiber driver and isolation stabilized voltage power supply; Wherein,
Current sensor is used to measure the output current of chain-type inverter, makes the former limit and the secondary of the current sensor of measuring chain-type inverter only need bear the withstand voltage of a chain link power model maximum output voltage;
A/D converter and overcurrent protector, A/D converter received current measuring-signal, and convert digital signal to, receive the control signal of field programmable gate array chip simultaneously, overcurrent protector compares current measurement signal and overcurrent protection setting signal, and the overcurrent protection signal is sent to field programmable gate array chip;
Field programmable gate array chip receives current measurement digital signal and overcurrent protection signal from A/D converter and overcurrent protector, signal is encoded and is converted the serial communication data-signal to, and signal is sent to the optical fiber driver;
The optical fiber driver is used for converting above-mentioned serial communication data-signal to light signal, sends in the optical fiber;
Isolate stabilized voltage power supply, be used to current sensor, A/D converter and overcurrent protector, field programmable gate array chip and optical fiber driver that stabilized voltage power supply is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910083237XA CN101540496B (en) | 2009-04-30 | 2009-04-30 | Measuring and protecting device of output current of chain-type inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910083237XA CN101540496B (en) | 2009-04-30 | 2009-04-30 | Measuring and protecting device of output current of chain-type inverter |
Publications (2)
| Publication Number | Publication Date |
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| CN101540496A CN101540496A (en) | 2009-09-23 |
| CN101540496B true CN101540496B (en) | 2010-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910083237XA Expired - Fee Related CN101540496B (en) | 2009-04-30 | 2009-04-30 | Measuring and protecting device of output current of chain-type inverter |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949972A (en) * | 2010-08-12 | 2011-01-19 | 浙江省电力公司 | Current measurement device for high-voltage converter |
| CN102280891B (en) * | 2011-07-28 | 2013-07-31 | 思源清能电气电子有限公司 | Static var generator (SVG) device parallel running control system and method based on optical fiber high speed communication |
| CN103840475A (en) * | 2014-03-12 | 2014-06-04 | 兴盛电器股份有限公司 | Stepless compensating device and method |
| CN105576616A (en) * | 2015-12-22 | 2016-05-11 | 中国科学院等离子体物理研究所 | Full isolation measuring and protective device used for high voltage supply system |
| CN106207977A (en) * | 2016-07-25 | 2016-12-07 | 国网湖南省电力公司 | A kind of output current measurement for chain-type inverter and protection device |
| CN107807287B (en) * | 2017-08-30 | 2019-11-15 | 全球能源互联网研究院有限公司 | A kind of test macro of valve base control equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2582130Y (en) * | 2002-10-29 | 2003-10-22 | 顺德特种变压器厂 | Active optical fibre current transformer |
| CN2874915Y (en) * | 2005-12-09 | 2007-02-28 | 刘文辉 | Power control device for chain converter |
| CN201181842Y (en) * | 2008-01-08 | 2009-01-14 | 江苏省电力试验研究院有限公司 | Dynamic electric voltage recovery device based on GPRS remote monitoring |
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2009
- 2009-04-30 CN CN200910083237XA patent/CN101540496B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2582130Y (en) * | 2002-10-29 | 2003-10-22 | 顺德特种变压器厂 | Active optical fibre current transformer |
| CN2874915Y (en) * | 2005-12-09 | 2007-02-28 | 刘文辉 | Power control device for chain converter |
| CN201181842Y (en) * | 2008-01-08 | 2009-01-14 | 江苏省电力试验研究院有限公司 | Dynamic electric voltage recovery device based on GPRS remote monitoring |
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| CN101540496A (en) | 2009-09-23 |
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