CN216794631U - SVG static var generator of precision finishing - Google Patents
SVG static var generator of precision finishing Download PDFInfo
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- CN216794631U CN216794631U CN202122703043.4U CN202122703043U CN216794631U CN 216794631 U CN216794631 U CN 216794631U CN 202122703043 U CN202122703043 U CN 202122703043U CN 216794631 U CN216794631 U CN 216794631U
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Abstract
The utility model provides a precisely processed SVG static var generator, which comprises a box body, a power panel, a signal conditioning panel, an FPGA controller, an IGBT module, a direct current bus capacitor, a radiator, a reactor, a fuse board and a current terminal, wherein a left supporting transverse plate and a right supporting transverse plate are arranged in the box body; the power panel is arranged on the left side wall plate of the box body, and the current terminal is arranged on the outer side of the right side wall plate of the box body; a left auxiliary supporting plate is arranged above the left supporting transverse plate in parallel, and the signal conditioning plate and the FPGA controller are arranged on the left auxiliary supporting plate; the direct current bus capacitor is arranged below the left supporting transverse plate; the reactor sets up in the below of right branch frame diaphragm, and the fuse board is located the top of right branch frame diaphragm. The utility model triggers the IGBT power converter to inject the compensation current into the military integrated power grid, thereby realizing closed-loop control and completing the compensation function.
Description
Technical Field
The utility model relates to the field of filters, in particular to an APF active filter used in the military industry integrated circuit industry.
Background
The most common passive filter structure is to connect the inductor and the capacitor in series to form a low-impedance bypass for the major subharmonics (3, 5, 7). The passive filter is composed of passive elements such as LC and the like, is designed to be extremely low impedance under a certain frequency, shunts harmonic current of the corresponding frequency, and has a behavior mode of providing a passive harmonic current bypass channel. The single-tuned filter, the double-tuned filter and the high-pass filter belong to passive filters.
The passive filter has the following disadvantages in application:
1. the resonant frequency depends on the element parameters, so that only the major harmonics can be filtered, and the drift of the LC parameters will cause the filter characteristics to change, making the filter performance unstable.
2. The filter characteristic depends on the parameters of the power grid, and the impedance and harmonic frequency of the power grid change at any time along with the change of the operating condition of the power system, so that the design of the LC network is difficult.
3. The impedance of the power grid system may generate series-parallel resonance with the LC network, thereby generating a harmonic overvoltage or harmonic current amplification phenomenon, which affects the stable operation and power supply quality of the power grid.
4. Harmonic currents near the harmonic source are injected into the local filter, causing the local filter to overload.
5. The volume is large, the harmonic frequency is required to be selected specifically according to the harmonic frequency, and only the specific harmonic frequency can be eliminated.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide an APF active filter for the military industry integrated circuit industry, which reduces the volume, increases the compensation capacity, improves the compensation precision and the corresponding speed, and carries out accurate dynamic compensation on the system.
In order to solve the technical problems, the embodiment of the utility model provides a precision-machined SVG static var generator, which comprises a box body, a power supply board, a signal conditioning board, an FPGA controller, an IGBT module, a direct-current bus capacitor, a radiator, a reactor, a fuse board and a current terminal, wherein the box body comprises a bottom plate, a top plate and four side enclosing plates;
the power panel is arranged on the left side wall plate of the box body, and the current terminal is arranged on the outer side of the right side wall plate of the box body;
a left auxiliary supporting plate is arranged above the left supporting transverse plate in parallel, and the signal conditioning plate and the FPGA controller are both arranged on the left auxiliary supporting plate;
the direct-current bus capacitor is arranged below the left supporting transverse plate;
the reactor is arranged below the right supporting transverse plate, and the fuse board is arranged above the right supporting transverse plate.
Wherein, the SVG solution of precision finishing for the well boat industry still include radiator fan, the below fixedly connected with of left side support diaphragm and the parallel left branch strut vertical plate of left side bounding wall, radiator fan locates the left side of left branch strut vertical plate, be equipped with radiator grid on the left side bounding wall.
Preferably, there are a plurality of the heat dissipation fans, and the plurality of the heat dissipation fans are arranged in a row in front and back on the left side of the left supporting vertical plate.
Wherein the IGBT module comprises an IGBT drive plate and a power converter.
Preferably, the SVG static var generator solution of the precision finishing for the middle aviation industry include 4 current terminal and 3 fuse plates, 3 arrange in the top of right branch support diaphragm around the fuse plate, 3 fuse plate and direct current bus capacitance are connected through copper bar and 4 current terminal one-to-one respectively.
The bottom of the radiator is fixedly connected with the bottom plate of the box body.
Furthermore, 5 fan mounting holes are formed in the left supporting longitudinal plate, and 5 cooling fans are mounted in the 5 fan mounting holes in a one-to-one correspondence mode.
The technical scheme of the utility model has the following beneficial effects:
1. the utility model uses current transformer to collect current on DC line, and through sampling, the obtained current signal is processed by harmonic separation algorithm to obtain harmonic reference signal as modulation signal, comparing with triangular wave to obtain switch signal, the switch signal is used to control single phase bridge, according to the principle of technology, the switch signals of upper and lower bridge arms are reversely connected to obtain harmonic current with same size and opposite direction with the harmonic signal on line, and the harmonic current on line is cancelled.
2. The APF active filter provided by the utility model reduces the volume, increases the compensation capacity; the compensation precision response speed is improved, and the system is subjected to accurate dynamic compensation; the safety of the equipment is improved, and the daily inspection maintenance is convenient; the system is not influenced by system impedance and frequency; the equipment cannot be damaged due to overload; the dynamic compensation can eliminate 2-50 harmonics.
Drawings
FIG. 1 is a perspective view of the interior of the case of the present invention;
FIG. 2 is a front view of the interior of the case of the present invention;
fig. 3 is a circuit diagram of the WICN-APF7 active filter of the present invention.
Description of the reference numerals:
1. a box body; 101. a left support cross plate; 102. a right support cross plate; 103. a left accessory support plate; 104. a left support longitudinal plate; 2. a power panel; 3. a signal conditioning board; 4. an FPGA controller; 5. an IGBT module; 6. a DC bus capacitor; 7. a heat sink; 8. a reactor; 9. a fuse board; 10. a current terminal; 11. a heat dissipation fan.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. As shown in fig. 1-3, an embodiment of the utility model provides a precision-machined SVG static var generator, which includes a box 1, a power board 2, a signal conditioning board 3, an FPGA controller 4, an IGBT module 5, a dc bus capacitor 6, a heat sink 7, a reactor 8, a fuse board 9, and a current terminal 10, where the box 1 includes a bottom plate, a top plate, and four side panels, a left supporting transverse plate 101 and a right supporting transverse plate 102 are provided in the box 1, a left end of the left supporting transverse plate 101 is fixedly connected with the left side panel of the box 1, a right end of the right supporting transverse plate 102 is fixedly connected with the right side panel of the box 1, the heat sink 7 is provided between the left supporting transverse plate 101 and the right supporting transverse plate 102, and a bottom of the heat sink 7 is fixedly connected with the bottom plate of the box 1.
The reactor 8 is arranged below the right support cross plate 102, is mounted on the reactor plate, and is located on the rear side of the radiator 7 and the IGBT module 5.
The IGBT module 5 comprises an IGBT driving board and an IGBT power converter, and the IGBT power converter is triggered by the IGBT driving board. The IGBT module 5 is mounted above the heat sink 7 and regulates the current through the reactor 8 by regulating the output voltage of the IGBT power converter.
The direct current bus capacitor 6 is arranged below the left supporting transverse plate 101, is installed on the capacitor plate, is located on the front side of the radiator 7 and the IGBT module 5, and provides energy for the energy storage device through the IGBT power converter and the compensating current output by the filter reactor inside.
A left auxiliary supporting plate 103 is arranged above the left supporting transverse plate 101 in parallel, and the signal conditioning plate 3 and the FPGA controller 4 are both arranged on the left auxiliary supporting plate 103. The power panel 2 is arranged on the left side wall plate of the box body 1 and provides a 15V power supply for the FPGA controller 4. The CT real-time acquisition current signal is sent to a signal conditioning circuit on the signal conditioning board 3 and then sent to the FPGA controller 4. The FPGA controller 4 separates fundamental wave components, extracts all harmonic currents, compares the acquired current components to be compensated with compensation currents sent by a WICN-APF7 active filter to obtain difference values, outputs the difference values as real-time compensation signals to a driving circuit on an IGBT driving board, triggers an IGBT power converter to inject the compensation currents into a military industry integrated power grid, achieves closed-loop control, and completes the compensation function.
The current terminal 10 is arranged outside the right coaming of the box body 1.
The fuse plate 9 is arranged above the right supporting transverse plate 102 and located at the upper end of the reactor plate for protecting equipment.
Well boat industrial precision finishing's SVG still includes radiator fan 11, the below fixedly connected with of left branch props diaphragm 101 and the parallel left branch props vertical plate 104 of left side bounding wall, radiator fan 11 locates the left side of left branch props vertical plate 104, be equipped with radiator grid on the bounding wall of left side. The heat dissipation fans are arranged in a row at the front and back of the left side of the left supporting vertical plate.
In this embodiment, 5 fan mounting holes are formed in the left supporting longitudinal plate 104, and 5 heat dissipation fans 11 are mounted in the 5 fan mounting holes in a one-to-one correspondence manner.
This embodiment includes 4 current terminal 10 and 3 fuse boards 9, 3 arrange in the top of right branch support diaphragm 102 around the fuse board 9, 3 fuse board 9 and direct current bus electric capacity 6 are connected through copper bar and 4 current terminal 10 one-to-one respectively.
The loads in the military integrated circuit industry are mostly finish machining, the working period is short, the frequency is high, the fault tolerance rate is low, the requirement on the quality of electric energy is high, the speed of treatment on the problem of harmonic treatment is high, the accuracy is high, the product stability is good, the dynamic compensation is carried out, and the compensation times include multiple times of harmonic generated by the loads.
The FPGA controller, the IGBT power converter and the reactor are three main parts of a WICN-APF7 active filter main circuit, the WICN-APF7 active filter collects current on a direct current line by a current transformer, the current is sampled, the obtained current signal is processed by a harmonic separation algorithm to obtain a harmonic reference signal which is used as a modulation signal, the modulation signal is compared with a triangular wave to obtain a switching signal, the switching signal is used for controlling a single-phase bridge, according to the technical principle, the switching signals of an upper bridge arm and a lower bridge arm are reversely connected, harmonic current with the same size and the opposite direction as the harmonic signal on the line can be obtained, and the harmonic current on the line is cancelled. In the utility model, the IGBT module enables the WICN-APF7 active filter to generate current with the same magnitude and opposite phase with the harmonic current of the system to be injected into the power grid, so that the current waveform on the power supply side of the power grid is a sine wave, and the function of filtering out harmonic waves is realized.
The WICN-APF7 active filter detects the current of the power grid or the current of the load in real time through an external mutual inductor CT, a controller extracts the fundamental wave current and each subharmonic current of the load through fast Fourier transform, obtains data such as active, reactive, negative sequence and the like through dq rotation coordinates, then generates compensation current with the same size and opposite phases with compensation targets (harmonic, reactive and unbalanced) through an IGBT power converter and injects the compensation current into the power grid, and the function of improving the power quality of the power grid side is achieved.
As shown in fig. 3, the main circuit of the WICN-APF7 active filter is shown, the WICN-APF7 active filter is firstly soft-started by a soft start resistor, when the capacitor voltage rises to 80% of a rated value, the main contactor is closed, the capacitor voltage rises to the rated value through PWM modulation, when the APF7 normally works, the current and voltage signals of the power grid are collected in real time by external CT and PT and sent to a signal conditioning circuit, all harmonic currents are extracted by a controller, the harmonic currents are output to a driving circuit after modulation to trigger a cascade multilevel IGBT converter, the current on the reactor is further adjusted by adjusting the output voltage of the power converter, so that the APF7 generates a current with the same magnitude and opposite phase with the harmonic current of the system and injects the current into the power grid, the current waveform of the power supply side of the power grid becomes a sine wave, and the function of filtering the harmonic wave is realized.
The APF is characterized as follows:
1. the filtering precision is high, and the harmonic current filtering rate can reach more than 97%;
2. the filtering range is wide, and the filtering times are as follows: 2-50 harmonics and inter-harmonics;
3. the response to the fluctuation of the load is fast, and the response time is 1 us;
4. dynamically injecting current to suppress harmonics and compensate for power factor;
5. no resonance with the system occurs;
6. capacity can be expanded by combining a plurality of devices;
7. suppressing system overvoltage and improving system voltage stability;
8. damping power system power oscillations;
9. the voltage flicker can be inhibited, the three-phase imbalance can be compensated, and the power factor can be improved;
10. the system has extremely strong self-protection and stability.
APF technical data table
The working principle of the utility model is as follows: after the breaker is switched on, in order to prevent the instantaneous impact of a power grid on a capacitor of the direct current bus during power-on, the WICN-APF7 active filter firstly charges the capacitor of the direct current bus through a soft starting resistor, and the process lasts for tens of seconds. When the bus voltage Udc reaches a predetermined value, the main contactor is closed. The direct current capacitor is used as an energy storage device, and compensation current is output outwards through the IGBT inverter and the internal reactor to provide energy. The WICN-APF7 active filter collects current signals in real time through an external CT and sends the current signals to the signal conditioning circuit, and then the current signals are sent to the controller. The controller separates fundamental wave components, extracts all harmonic currents, compares the acquired current components to be compensated with the compensation current sent by the WICN-APF7 active filter to obtain a difference value, outputs the difference value as a real-time compensation signal to the driving circuit, triggers the IGBT converter to inject the compensation current into a power grid, realizes closed-loop control and completes the compensation function.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (7)
1. The SVG static var generator is characterized by comprising a box body, a power panel, a signal conditioning panel, an FPGA controller, an IGBT module, a direct current bus capacitor, a radiator, a reactor, a fuse board and a current terminal, wherein the box body comprises a bottom plate, a top plate and four side wall plates, a left supporting transverse plate and a right supporting transverse plate are arranged in the box body, the left end of the left supporting transverse plate is fixedly connected with the left side wall plate of the box body, the right end of the right supporting transverse plate is fixedly connected with the right side wall plate of the box body, the radiator is arranged between the left supporting transverse plate and the right supporting transverse plate, and the IGBT module is arranged above the radiator;
the power panel is arranged on the left side wall plate of the box body, and the current terminal is arranged on the outer side of the right side wall plate of the box body;
a left auxiliary supporting plate is arranged above the left supporting transverse plate in parallel, and the signal conditioning plate and the FPGA controller are both arranged on the left auxiliary supporting plate;
the direct-current bus capacitor is arranged below the left supporting transverse plate;
the reactor is arranged below the right supporting transverse plate, and the fuse board is arranged above the right supporting transverse plate.
2. The precisely processed SVG static var generator according to claim 1, further comprising a heat dissipating fan, wherein a left supporting vertical plate parallel to the left side surrounding plate is fixedly connected below the left supporting horizontal plate, the heat dissipating fan is provided at the left side of the left supporting vertical plate, and a heat dissipating grid is provided on the left side surrounding plate.
3. The precision-processed SVG static var generator according to claim 2, wherein said radiator fan is plural, and plural said radiator fans are arranged in line one behind another on the left side of the left supporting vertical plate.
4. The precision-engineered SVG static var generator of claim 1, wherein said IGBT module comprises an IGBT driver board and a power converter.
5. The precision-machined SVG static var generator according to claim 1, comprising 4 current terminals and 3 fuse blocks, 3 said fuse blocks being arranged front and back above the right supporting cross plate, 3 said fuse blocks and DC bus capacitors being connected with 4 current terminals one-to-one through copper bars, respectively.
6. The precision-processed SVG static var generator according to claim 1, wherein the bottom of said radiator is fixedly connected to the bottom plate of the cabinet.
7. The precision-processed SVG static var generator according to claim 2 or 3, wherein 5 fan mounting holes are provided in said left supporting vertical plate, and 5 said radiator fans are mounted in the 5 fan mounting holes in a one-to-one correspondence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122703043.4U CN216794631U (en) | 2021-11-07 | 2021-11-07 | SVG static var generator of precision finishing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122703043.4U CN216794631U (en) | 2021-11-07 | 2021-11-07 | SVG static var generator of precision finishing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216794631U true CN216794631U (en) | 2022-06-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122703043.4U Active CN216794631U (en) | 2021-11-07 | 2021-11-07 | SVG static var generator of precision finishing |
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| Country | Link |
|---|---|
| CN (1) | CN216794631U (en) |
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2021
- 2021-11-07 CN CN202122703043.4U patent/CN216794631U/en active Active
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