CN219107308U - Single-phase 60Hz variable frequency power supply device based on boosting of railway VV transformer - Google Patents
Single-phase 60Hz variable frequency power supply device based on boosting of railway VV transformer Download PDFInfo
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- CN219107308U CN219107308U CN202221726035.XU CN202221726035U CN219107308U CN 219107308 U CN219107308 U CN 219107308U CN 202221726035 U CN202221726035 U CN 202221726035U CN 219107308 U CN219107308 U CN 219107308U
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Abstract
The utility model relates to a single-phase 60Hz variable frequency power supply device based on boosting of a railway VV transformer, which is used for improving and assembling old equipment and providing power supply for a load STATCOM device. The utility model has the advantages that: the three-phase alternating voltage is converted into single-phase alternating voltage in a boosting way; the primary side current of the secondary side single-phase on-load of the railway VV transformer cannot generate reverse power to the power valve group; the boosting ratio of the railway VV transformer can be improved; realizing the conversion of the frequency from 50Hz to 60Hz; the workshop is formed by reforming and assembling old equipment, and the workshop is low in cost and easy to popularize.
Description
Technical Field
The utility model relates to a single-phase 60Hz variable frequency power supply device based on boosting of a railway VV transformer.
Background
In recent years, with the continuous improvement of the manufacturing capability and the technical level of high-voltage high-power electronic equipment in China, the number of outlets of power quality control devices such as high-voltage high-power STATCOM is more and more, the power grid frequency of many countries is 60Hz, but the power grid frequency of China is 50Hz, and the power quality control devices such as STATCOM have to be subjected to high-voltage high-current test according to the power grid frequency of 60Hz in the process of factory acceptance and debugging, so that the 60Hz high-voltage high-power supply system is urgently required to be provided to meet the factory debugging requirements of the equipment.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims to provide a single-phase 60Hz variable frequency power supply device based on boosting of a railway VV transformer, which is formed by reconstruction and assembly of old equipment in workshops, can realize the factory test of the 60Hz single-phase STATCOM device, can realize the split-phase test of a 60Hz three-phase STATCOM device valve bank, and is formed by boosting of a conventional diode uncontrolled rectification and full control inversion cascading multi-level three-phase variable frequency power supply and the railway VV transformer, and meets factory debugging requirements.
In order to achieve the above purpose, the present utility model is realized by the following technical scheme:
the single-phase 60Hz variable frequency power supply device based on the boosting of a railway VV transformer comprises a container, wherein the container comprises a variable frequency power supply valve group and a control unit, each phase of the variable frequency power supply valve group is connected in series through ports by n H bridge power units, and three phases are connected in a star shape through the ports;
the H bridge power unit comprises a rectifying unit, an inversion unit, a capacitor C and a resistor R, wherein the rectifying unit, the inversion unit, the capacitor C and the resistor R are connected in parallel through ports, the rectifying unit comprises six diodes D1-D6 with the same specification, the anode of the diode D1 and the cathode of the diode D2 are connected with A of AC690V/50Hz, the anode of the diode D3 and the cathode of the diode D4 are connected with B of AC690V/50Hz, the anode of the diode D5 and the cathode of the diode D6 are connected with C of AC690V/50Hz, and the rectifying unit is used for diode uncontrolled rectification;
the inversion unit comprises four IGBT tubes S1-S4 with the same specification and four freewheel diodes D11-D14 with the same specification;
the collectors of the IGBT tubes S1 and S3 are connected with one end of the capacitor C through a port, the emitters of the IGBT tubes S2 and S4 are connected with the other end of the capacitor C through a port, the emitters of the IGBT tubes S1 and S2 are connected through a port, the emitters of the IGBT tubes S3 and S4 are connected through a port, and the connection point of the IGBT tubes S1 and S2 and the connection point of the IGBT tubes S3 and S4 form alternating current output AC690V/60Hz;
the control unit is connected with the H bridge power unit through a communication port.
The device comprises a valve bank, a filter output port, a railway VV transformer, a filter output port and a load, wherein the filter output port is connected with the filter output port;
the phase-shifting transformer is used for converting 10KV/50Hz of a three-phase alternating current power grid into three-phase 10 groups of 690V three-phase power supplies respectively, and providing the three-phase alternating current power supply for the container;
the variable-frequency power supply valve bank of the container is used for converting 10KV/50Hz of a three-phase alternating-current power supply into 11KV/60Hz of a three-phase alternating-current power supply and providing power for a railway VV transformer;
the railway VV transformer is used for converting the 11KV/60Hz of the three-phase alternating current power supply into 35KV/60Hz of the three-phase alternating current power supply and providing power for the load;
the container also comprises an isolating switch and an LC filter compensator, wherein the input end of the isolating switch is connected with the 10KV/50Hz of the three-phase alternating current power supply, the output end of the isolating switch is connected with the primary side of the phase-shifting transformer, and the isolating switch is used for providing the 10KV/50Hz of the three-phase alternating current power supply for the phase-shifting transformer;
the LC filter compensator comprises compensation inductors respectively coupled in series to the three-phase output sides of the variable frequency power supply valve bank and compensation capacitors respectively coupled in parallel between any two phases of the three-phase output sides of the variable frequency power supply valve bank, and is used for filtering high-frequency harmonic waves.
The control unit comprises an HMI human-computer interface and a controller, wherein the HMI human-computer interface is connected with the controller through a communication port and is used for displaying the voltage and current waveform and the system running state of the H-bridge power unit.
The controller is respectively connected with a PWMA board, a PWMB board and a PWMC board through ports, the PWMA board is connected with n H-bridge power units of the A phase-change frequency power supply valve bank through communication ports, the PWMB board is connected with n H-bridge power units of the B phase-change frequency power supply valve bank through communication ports, and the PWMC board is connected with n H-bridge power units of the C phase-change frequency power supply valve bank through communication ports;
the chip of the controller comprises a DSP and an FPGA, wherein the DSP is selected from ADI21489 for data processing, and the FPGA is selected from EP3C16 of Cyclone III series for generating a trigger signal.
Compared with the prior art, the utility model has the beneficial effects that:
1. the three-phase alternating voltage is converted into single-phase alternating voltage in a boosting mode.
2. The primary current of the secondary side single-phase on-load of the railway VV transformer can not generate reverse power to the power valve group.
3. The boosting ratio of the railway VV transformer can be improved.
4. The frequency conversion from 50Hz to 60Hz is achieved.
5. The workshop is formed by reforming and assembling old equipment, and the workshop is low in cost and easy to popularize.
Drawings
Fig. 1 is a schematic diagram of a topology structure of a variable frequency power supply device.
Fig. 2 is a schematic topology diagram of a variable frequency power supply rectifying unit.
Fig. 3 is a schematic diagram of the control unit principle.
Fig. 4 is a waveform of the output voltage and current simulation of a conventional three-phase symmetrical output voltage control mode active valve set.
Fig. 5 is a waveform of the output voltage and current simulation of the novel output voltage control mode active valve set.
Detailed Description
The present utility model will be described in detail below with reference to the drawings of the specification, but it should be noted that the practice of the present utility model is not limited to the following embodiments.
The following examples are given by way of illustration of detailed embodiments and specific procedures based on the technical scheme of the present utility model, but the scope of the present utility model is not limited to the following examples. The methods used in the examples described below are conventional methods unless otherwise specified.
[ example 1 ]
The three-phase alternating current output voltage of the conventional variable frequency power supply valve bank adopts a traditional three-phase voltage complete symmetrical control mode, namely a control mode that three-phase voltage amplitude is completely equal and phase difference is 120 degrees is adopted, and the control mode is not applicable to power supply of the single-phase STATCOM device valve bank boosted by the railway VV transformer, because the three-phase input current relationship of the railway VV transformer is always identical in current amplitude and phase of A phase and C phase, the phases of B phase current and AC two-phase current are completely opposite, and the current amplitude is 2 times of the current amplitude of the AC two-phase current. If a conventional symmetrical control mode with 120-degree mutual difference of three-phase voltages is adopted, the situation that one phase of output has reverse power always occurs on the three-phase alternating current output side of the variable frequency power supply valve bank, and as the power unit of the H bridge of the variable frequency power supply valve bank adopts a diode uncontrolled rectifying structure and does not have four-quadrant operation capability, the overvoltage fault of the direct current side always occurs on the one-phase power supply valve bank, see fig. 4, the situation that the reverse power occurs on the C phase in the simulation result, and the direct current overvoltage fault of the power unit of the C-phase power supply valve bank can be caused.
Referring to fig. 5, after transformation, the control mode is to control the three-phase alternating current output voltage UA and UC of the variable frequency power supply valve bank to be completely same in amplitude and same in phase, and UB and UA and UC are same in amplitude but completely opposite in phase.
For example, the turn ratio of the secondary side to the primary side of the railway VV transformer is N, and the phase voltage of the variable-frequency power supply is U p The secondary side output voltage of the transformer is 1.732U by adopting the traditional control mode p *N*1.732＝3N*U p And the secondary side output voltage of the transformer is 2U by adopting a new control mode p *N*2＝4N*U p . Variable frequency power supply valve group output phase voltage amplitude is the sameUnder the condition, the control unit can enable the secondary side output voltage of the railway VV transformer to be higher, namely, a larger transformer boosting ratio is realized, so that the number of stages of the power valve unit can be reduced. As can be seen from the simulation results of FIGS. 4 and 5, under the condition of the same valve group output phase voltage and the same transformer parameters, the single-phase voltage V is output by adopting the conventional control mode sc The effective value is 27.5kV, and the single-phase voltage V is output by adopting a control method after transformation sc The effective value is 36.6kV. The transformer step-up ratio can be increased from 2.75 to 3.66 by adopting the control mode after transformation, and is the same as the theoretical analysis result.
Referring to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, a single-phase 60Hz variable frequency power supply device based on boosting of a railway VV transformer is improved and assembled by old equipment to provide a power supply for a load STATCOM device, and the device comprises a container, a phase-shifting transformer and the railway VV transformer, wherein the container is connected with the multi-winding phase-shifting transformer through a valve group input port, the container is connected with the primary side of the railway VV transformer through a filtering output port, and the secondary side of the railway VV transformer is connected with the load STATCOM device through an output port; the phase-shifting transformer is used for converting 10KV/50Hz of a three-phase alternating current power grid into three-phase 10 groups of 690V three-phase power supplies respectively, and providing the three-phase alternating current power supply for the container; the variable-frequency power supply valve bank of the container is used for converting 10KV/50Hz of a three-phase alternating-current power supply into 11KV/60Hz of a three-phase alternating-current power supply and providing power for a railway VV transformer; the railway VV transformer is used for converting the 11KV/60Hz of the three-phase alternating current power supply into the 35KV/60Hz of the three-phase alternating current power supply and providing power for loads.
The container comprises a variable frequency power supply valve bank, a control unit, a disconnecting switch and an LC filter compensator, wherein the input end of the disconnecting switch is connected with the 10KV/50Hz of the three-phase alternating current power supply, the output end of the disconnecting switch is connected with the primary side of the phase-shifting transformer, and the disconnecting switch is used for providing the 10KV/50Hz of the three-phase alternating current power supply for the phase-shifting transformer; the LC filter compensator comprises compensation inductors respectively coupled in series to the three-phase output sides of the variable frequency power supply valve bank and compensation capacitors respectively coupled in parallel between any two phases of the three-phase output sides of the variable frequency power supply valve bank, and is used for filtering high-frequency harmonic waves.
Each phase of the variable frequency power supply valve bank is connected in series through ports by 10H-bridge power units, and three phases are connected in a star shape through the ports; the H-bridge power unit comprises a rectifying unit, an inversion unit, a capacitor C and a resistor R which are connected in parallel, wherein the rectifying unit and the inversion unit are connected in series through ports, the rectifying unit comprises six diodes D1-D6 with the same specification, the anode of the diode D1 and the cathode of the diode D2 are connected with A of AC690V/50Hz, the anode of the diode D3 and the cathode of the diode D4 are connected with B of AC690V/50Hz, the anode of the diode D5 and the cathode of the diode D6 are connected with C of AC690V/50Hz, and the rectifying unit is used for diode uncontrolled rectification; the inversion unit comprises four IGBT tubes S1-S4 with the same specification and four freewheel diodes D11-D14 with the same specification; the collectors of the IGBT tubes S1 and S3 are connected with one end of the capacitor C through a port, the emitters of the IGBT tubes S2 and S4 are connected with the other end of the capacitor C through a port, the emitters of the IGBT tubes S1 and S2 are connected through a port, the emitters of the IGBT tubes S3 and S4 are connected through a port, and the connection point of the IGBT tubes S1 and S2 and the connection point of the IGBT tubes S3 and S4 form alternating current output AC690V/60Hz;
the control unit is connected with the H-bridge power unit through a communication port and is used for detecting voltage and current signals of the H-bridge power unit and controlling the H-bridge power unit; the control unit comprises an HMI human-computer interface and a controller, wherein the HMI human-computer interface is connected with the controller through a communication port and is used for displaying the voltage and current waveform and the system running state of the H-bridge power unit.
The controller is respectively connected with a PWMA board, a PWMB board and a PWMC board through ports, the PWMA board is connected with 10H-bridge power units of the A-phase-change frequency power supply valve bank through communication ports, the PWMB board is connected with 10H-bridge power units of the B-phase-change frequency power supply valve bank through communication ports, and the PWMC board is connected with 10H-bridge power units of the C-phase-change frequency power supply valve bank through communication ports; the chip of the controller comprises a DSP and an FPGA, wherein the DSP is selected from ADI21489 for data processing, and the FPGA is selected from EP3C16 of Cyclone III series for generating a trigger signal.
The utility model realizes the step-up conversion of the three-phase alternating voltage into the single-phase alternating voltage; when the secondary side single-phase of the railway VV transformer is loaded, the primary side current does not generate reverse power to the power valve group; the boosting ratio of the railway VV transformer is improved; and the single-phase STATCOM device with the frequency of 60Hz is realized for factory testing.
Claims (4)
1. The single-phase 60Hz variable frequency power supply device based on the boosting of the railway VV transformer is characterized by comprising a container, wherein the container comprises a variable frequency power supply valve bank and a control unit, each phase of the variable frequency power supply valve bank is connected in series through ports by n H bridge power units, and three phases are connected in a star shape through the ports;
the H-bridge power unit comprises a rectifying unit, an inversion unit, a capacitor C and a resistor R, wherein the rectifying unit, the inversion unit, the capacitor C and the resistor R are connected in parallel through ports, the rectifying unit comprises six diodes D1-D6 with the same specification, the anode of the diode D1 and the cathode of the diode D2 are connected with A with the voltage of AC690V/50Hz, the anode of the diode D3 and the cathode of the diode D4 are connected with B with the voltage of AC690V/50Hz, the anode of the diode D5 and the cathode of the diode D6 are connected with C with the voltage of AC690V/50Hz, and the rectifying unit is used for uncontrolled rectification of the diode;
the inversion unit comprises four IGBT tubes S1-S4 with the same specification and four freewheel diodes D11-D14 with the same specification;
the collectors of the IGBT tubes S1 and S3 are connected with one end of a capacitor C through a port, the emitters of the IGBT tubes S2 and S4 are connected with the other end of the capacitor C through a port, the emitters of the IGBT tubes S1 and S2 are connected through a port, the emitters of the IGBT tubes S3 and S4 are connected through a port, and the connection point of the IGBT tubes S1 and S2 and the connection point of the IGBT tubes S3 and S4 form AC output of 690V/60Hz;
the control unit is connected with the H-bridge power unit through a communication port.
2. The single-phase 60Hz variable frequency power supply device based on the boosting of the railway VV transformer according to claim 1, further comprising a phase shifting transformer and the railway VV transformer, wherein the container is connected with the secondary side of the phase shifting transformer through a valve group input port, the container is connected with the primary side of the railway VV transformer through a filtering output port, and the secondary side of the railway VV transformer is connected with a load through an output port;
the phase-shifting transformer is used for converting 10KV/50Hz of a three-phase alternating current power grid into 10 groups of 690V three-phase power supplies respectively, and providing the three-phase alternating current power supply for the container;
the variable-frequency power supply valve bank of the container is used for converting 10KV/50Hz of a three-phase alternating-current power supply into 11KV/60Hz of a three-phase alternating-current power supply and providing power for a railway VV transformer;
the railway VV transformer is used for converting the 11KV/60Hz of the three-phase alternating current power supply into the 35KV/60Hz of the three-phase alternating current power supply and providing power for a load;
the container also comprises an isolating switch and an LC filter compensator, wherein the input end of the isolating switch is connected with the 10KV/50Hz of the three-phase alternating current power supply, the output end of the isolating switch is connected with the primary side of the phase-shifting transformer, and the isolating switch is used for providing the 10KV/50Hz of the three-phase alternating current power supply for the phase-shifting transformer;
the LC filter compensator comprises compensation inductors respectively coupled in series with the three-phase output sides of the variable frequency power supply valve bank and compensation capacitors respectively coupled in parallel between any two phases of the three-phase output sides of the variable frequency power supply valve bank, and the LC filter compensator is used for filtering high-frequency harmonic waves.
3. The single-phase 60Hz variable frequency power supply device based on the boosting of the railway VV transformer according to claim 1, wherein the control unit comprises an HMI human-machine interface and a controller, the HMI human-machine interface is connected with the controller through a communication port, and the HMI human-machine interface is used for displaying the voltage and current waveform and the system running state of the H bridge power unit.
4. The single-phase 60Hz variable frequency power supply device based on the boosting of the railway VV transformer according to claim 3, wherein the controller is respectively connected with a PWMA board, a PWMB board and a PWMC board through ports, the PWMA board is connected with n H-bridge power units of the A-phase variable frequency power supply valve bank through communication ports, the PWMB board is connected with n H-bridge power units of the B-phase variable frequency power supply valve bank through communication ports, and the PWMC board is connected with n H-bridge power units of the C-phase variable frequency power supply valve bank through communication ports;
the chip of the controller comprises a DSP and an FPGA, wherein the DSP is selected from ADI21489 for data processing, and the FPGA is selected from the EP3C16 of the Cyclone III series for generating a trigger signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221726035.XU CN219107308U (en) | 2022-07-06 | 2022-07-06 | Single-phase 60Hz variable frequency power supply device based on boosting of railway VV transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221726035.XU CN219107308U (en) | 2022-07-06 | 2022-07-06 | Single-phase 60Hz variable frequency power supply device based on boosting of railway VV transformer |
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| CN219107308U true CN219107308U (en) | 2023-05-30 |
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| CN202221726035.XU Active CN219107308U (en) | 2022-07-06 | 2022-07-06 | Single-phase 60Hz variable frequency power supply device based on boosting of railway VV transformer |
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