CN219496539U

CN219496539U - SVG power unit module detecting instrument based on FPGA

Info

Publication number: CN219496539U
Application number: CN202223561720.4U
Authority: CN
Inventors: 李海燕; 胡东升; 刘勇
Original assignee: Wuhan Woostar Electrical Technology Co ltd
Current assignee: Wuhan Woostar Electrical Technology Co ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-08-08
Anticipated expiration: 2032-12-30

Abstract

An SVG power unit module detection instrument based on an FPGA comprises a main control board, a sampling plate and a power supply unit; the power supply unit is respectively and electrically connected with the main control board, the sampling plate and the SVG power unit module to be tested, and supplies power to the main control board, the sampling plate and the SVG power unit module to be tested; the main control board is electrically connected with the control port of the SVG power unit module and used for issuing control instructions to the SVG power unit module, the sampling board is electrically connected with the sampling port of the SVG power unit module and used for sampling corresponding electric signals, and the sampling board is also electrically connected with the main control board and used for sending collected electric signals to the main control board. The portable H-bridge power unit module detection instrument is specifically designed, the operation is simple and convenient, and the production inspection and application efficiency of SVG products can be greatly improved.

Description

SVG power unit module detecting instrument based on FPGA

Technical Field

The utility model relates to the field of SVG power unit detection, in particular to an SVG power unit module detection instrument based on an FPGA.

Background

The chained static synchronous compensator (StaticSynchronous Compensator, STATCOM) system formed by cascading H bridge modules is also called (SVG), and is widely applied to medium-high voltage and high-capacity occasions and dynamically adjusts reactive power of a power grid due to the advantages of simple structure, fast dynamic response, small output harmonic and the like. Compared with a traditional SVC instrument represented by TCR, the SVG has the advantages of higher regulating speed and wide operating range, and greatly reduces the harmonic content of output current after adopting multiplexing, multi-level and other PWM technical measures. More importantly, the reactors and capacitive elements used in SVG are much smaller than those used in SVC, which reduces the size of the instrument. A high voltage Static Var Generator (SVG) in the form of a cascaded H-bridge is made up of a plurality of H-bridge power cells. In order to ensure reliable grid connection of the SVG device, careful factory detection and detection before field grid connection are required to be carried out on the H-bridge power unit. At present, a test program of an H-bridge power unit is specially designed, and an oscilloscope is used for observing whether waveforms of H-bridge power single inversion are normal or not. This approach is inefficient and requires high levels of testing personnel.

Disclosure of Invention

In view of the technical defects and technical drawbacks existing in the prior art, the embodiment of the utility model provides an SVG power unit module detecting instrument based on FPGA, which overcomes the above problems or at least partially solves the above problems, and the specific scheme is as follows:

an SVG power unit module detection instrument based on an FPGA comprises a main control board, a sampling plate and a power supply unit; the power supply unit is respectively and electrically connected with the main control board, the sampling plate and the SVG power unit module to be tested, and supplies power to the main control board, the sampling plate and the SVG power unit module to be tested; the main control board is electrically connected with the control port of the SVG power unit module and used for issuing control instructions to the SVG power unit module, the sampling board is electrically connected with the sampling port of the SVG power unit module and used for sampling corresponding electric signals, and the sampling board is also electrically connected with the main control board and used for sending collected electric signals to the main control board.

Further, the power supply unit is an AC220V alternating current power supply, and is electrically connected with the transformer and the rectifier in sequence and then is electrically connected with the direct current side power supply port of the SVG power unit module to supply power to the SVG power unit module.

Further, the power supply unit is electrically connected with the main control board, the sampling board and the internal control board of the SVG power unit module through a switching power supply.

Further, the sampling board comprises a first voltage acquisition circuit and a second voltage acquisition circuit, the first voltage acquisition circuit is electrically connected with the direct-current side voltage acquisition port of the SVG power unit module, and the second voltage acquisition circuit is electrically connected with the alternating-current side voltage acquisition port of the SVG power unit module.

Further, the main control board is electrically connected with a display unit for displaying the electric signals collected by the sampling plate.

Further, the main control board is electrically connected with a fault display lamp for displaying the state of the SVG power unit module.

Further, the SVG power unit module is also electrically connected with a discharging circuit.

Further, the main control board is a control board adopting FPGA as the main control chip

The utility model has the following beneficial effects:

the design adopts the FPGA as a main control chip, performs real-time communication with the SVG power unit through the optical fiber, can issue corresponding tasks to the SVG power unit according to corresponding instructions, and analyzes whether the SVG power unit is normal or not by reading in the uploading data of the SVG power unit in real time; for voltage display, the instrument adopts a four-bit nixie tube for display, the volume of the instrument is greatly reduced, because the sine wave THD of the PWM form output by the instrument is very high, the instrument can accurately display the alternating-current side voltage by designing a corresponding filter circuit, a two-position knob switch (discharge/800V) is used for replacing a universal change-over switch of an original detecting instrument, the instrument is in a discharge state after being electrified, the instrument is simplified on the basis of the original detecting instrument, and the current limiting protection is added on an 800V direct-current circuit, so that the running state of an SVG power unit can be rapidly analyzed, the short-circuit protection can be carried out on the detecting instrument, and fault judgment can be carried out to have a guiding effect on maintenance.

Drawings

Fig. 1 is a system block diagram of an SVG power unit module detection apparatus based on an FPGA according to an embodiment of the present utility model.

FIG. 2 is a main electrical schematic diagram of an SVG power unit module detecting instrument based on an FPGA according to an embodiment of the present utility model;

fig. 3 is a schematic diagram of an SVG power unit module detecting instrument based on FPGA according to an embodiment of the present utility model in use.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1-3, the SVG power unit module detecting instrument based on the FPGA provided by the embodiment of the present utility model includes a main control board, a sampling board and a power supply unit, where the power supply unit is electrically connected with the main control board, the sampling board and the SVG power unit module to be tested respectively and supplies power to the main control board, the sampling board and the SVG power unit module to be tested; the main control board is electrically connected with the control port of the SVG power unit module and used for issuing control instructions to the SVG power unit module, the sampling board is electrically connected with the sampling port of the SVG power unit module and used for sampling corresponding electric signals, and the sampling board is also electrically connected with the main control board and used for sending collected electric signals to the main control board.

The main control board comprises an FPGA, a display unit, an instruction issuing circuit, a fault indicator lamp, an optical fiber communication interface, a level conversion circuit and a reset circuit, and all detection, control, communication and display are completed by using one FPGA chip.

The power supply unit is an AC220V alternating current power supply, the AC220V alternating current power supply supplies power to the direct current side of the SVG power unit module through the direct current output by the transformer and the rectifier unit, and meanwhile 15V direct current is output to the control board inside the SVG power unit module and the main control board and the sampling board of the detection instrument. The main control board is communicated with the SVG power unit module through optical fibers, the power generation circuit issues instructions under the instructions, and meanwhile, the SVG power unit performs corresponding actions, wherein the actions comprise inversion output of square waves and sine waves, fault reading and resetting of the SVG power unit.

The sampling board comprises a first voltage acquisition circuit and a second voltage acquisition circuit, the first voltage acquisition circuit is electrically connected with a direct-current side voltage acquisition port of the SVG power unit module, and the second voltage acquisition circuit is electrically connected with an alternating-current side voltage acquisition port of the SVG power unit module. The sampling board voltage acquisition circuit inputs voltage signals of an alternating current side and a direct current side of the SVG power unit to the AD chip, the FPGA reads AD data and obtains voltage display data through corresponding data processing, and meanwhile, the data is output to the display unit which displays the data in a four-bit nixie tube. The main control board of the detecting instrument is communicated with the SVG power unit module in real time, receives data uploaded by the power unit, judges fault information at the same time, and displays the fault information through the LED lamp of the fault indicator lamp; when the system needs to be restarted, the reset circuit is pressed down.

The level conversion circuit converts the voltage of the power supply unit of DC 15V into DC 5V, 3.3V and 1.2V for the FPGA chip and the AD chip. The high-voltage part and the detection control part in the instrument circuit are separately designed, a discharge circuit is designed, and after detection is completed, the capacitor on the direct current side of the SVG power unit module is discharged; a soft start circuit is arranged in a main circuit of the instrument to prevent the power device from being burnt out due to overlarge current when the capacitor is charged; the direct current output circuit of the transformer of the instrument is added with a fuse, so that the secondary side of the transformer is prevented from being burnt out due to short circuit when the anode and the cathode of the inside of the module are connected reversely.

The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.

Claims

1. An SVG power unit module detection instrument based on an FPGA is characterized by comprising a main control board, a sampling plate and a power supply unit; the power supply unit is respectively and electrically connected with the main control board, the sampling plate and the SVG power unit module to be tested, and supplies power to the main control board, the sampling plate and the SVG power unit module to be tested; the main control board is electrically connected with the control port of the SVG power unit module and used for issuing control instructions to the SVG power unit module, the sampling board is electrically connected with the sampling port of the SVG power unit module and used for sampling corresponding electric signals, and the sampling board is also electrically connected with the main control board and used for sending collected electric signals to the main control board.

2. The FPGA-based SVG power unit module testing apparatus of claim 1, wherein the power supply unit is an AC220V AC power supply, and the power supply unit is electrically connected to the dc side power supply port of the SVG power unit module after being sequentially electrically connected to the transformer and the rectifier, to supply power to the SVG power unit module.

3. The FPGA-based SVG power unit module testing apparatus of claim 2, wherein the power supply unit is further electrically connected to the main control board, the sampling board, and the internal control board of the SVG power unit module through a switching power supply.

4. The FPGA-based SVG power cell module testing apparatus of claim 1, wherein the sampling board comprises a first voltage acquisition circuit electrically connected to the dc side voltage acquisition port of the SVG power cell module and a second voltage acquisition circuit electrically connected to the ac side voltage acquisition port of the SVG power cell module.

5. The FPGA-based SVG power module testing apparatus of claim 1, wherein said main control board is electrically connected to a display unit for displaying the electrical signals collected by the sampling board.

6. The FPGA-based SVG power cell module testing apparatus of claim 1, wherein said main control panel is electrically connected with a fault display lamp for displaying the status of the SVG power cell module.

7. The FPGA-based SVG power cell module testing apparatus of claim 1, wherein said SVG power cell module is further electrically connected to a discharge circuit.

8. The FPGA-based SVG power unit module testing apparatus of claim 1, wherein said master control board is a control board employing FPGA as the master control chip.