CN210269937U - Reactive and continuous frequency spectrum harmonic comprehensive generator - Google Patents
Reactive and continuous frequency spectrum harmonic comprehensive generator Download PDFInfo
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- CN210269937U CN210269937U CN201920865915.7U CN201920865915U CN210269937U CN 210269937 U CN210269937 U CN 210269937U CN 201920865915 U CN201920865915 U CN 201920865915U CN 210269937 U CN210269937 U CN 210269937U
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Abstract
The utility model discloses a generator is synthesized to idle and continuous frequency spectrum harmonic, including three-phase voltage transformer, three-phase current transformer, waveform data playback device, comprehensive calculation controller and full accuse power electronics cascade module amplification device, the relation of connection between each electrical equipment is shown in figure 1, specifically is: the input end of the comprehensive calculation controller is respectively connected with the output ends of the three-phase voltage transformer, the three-phase current transformer and the waveform data playback device, the output end of the comprehensive calculation controller is connected with the controlled end of the full-control power electronic cascade module amplifying device, and the full-control power electronic cascade module amplifying device outputs reactive power and continuous spectrum harmonic waves according to IGBT on-off control signals sent by the comprehensive calculation controller. The utility model discloses can export required idle and the continuous frequency spectrum harmonic of experiment, satisfy the detection requirement to harmonic controlgear and other idle harmonic comprehensive test environment's demand.
Description
Technical Field
The utility model relates to an electric power system electric energy quality technical field especially relates to a reactive and continuous frequency spectrum harmonic synthesizes generator.
Background
With the popularization of energy-saving technology and automation technology, the capacities of power electronic devices such as converter equipment, frequency conversion equipment and the like are increasingly enlarged, the number of the power electronic devices is increased, and higher harmonics in a power grid are more and more serious, however, the generation of the harmonics poses potential threats to the safety, stability and economic operation of a power system, and great influence is brought to the electrical environment. For example, the effect on the capacitor: under the action of harmonic voltage, a capacitor in the power system generates extra power loss, so that the aging and even burning of an insulating medium are accelerated; influence on asynchronous machines and transformers: the harmonic voltage can increase the eddy current loss of the iron core, and the harmonic current can increase the copper loss, so that the asynchronous motor and the transformer generate additional loss and overheating, the temperature rises, the insulation is accelerated to age, mechanical vibration, noise and harmonic overvoltage are generated, the efficiency and the utilization rate of equipment are reduced, and the service life is shortened; impact on power cables and distribution lines: the increase of the harmonic current frequency can cause obvious skin effect, the resistance of a lead is increased, the line loss is increased, the heating is increased, the insulation is aged too early, the grounding short circuit fault is easy to occur, and the fire hazard is formed; impact on the communication device: the harmonic waves can generate serious interference on communication, electronic or automatic control equipment in modes of electromagnetic induction coupling, electrostatic induction coupling and the like; impact on weak current devices: power supply modules of weak current equipment such as a switch power supply and a building control system power supply can be interfered by harmonic waves on a zero line, and the weak current equipment is burnt out when the harmonic waves are serious.
Therefore, harmonics have been regarded as a big nuisance to the grid, and new techniques for studying and improving the quality of electric energy have been hot spots in electric power system research in recent years. With the development of harmonic control devices, how to check the performance of the harmonic control devices, or test the working condition of load devices when the load devices are disturbed, and the like, a special harmonic generator needs to be developed to generate the required harmonic.
Currently, the more advanced harmonic generators are roughly classified into two types: one is to utilize the power electronic current transformation technology, use the silicon controlled rectifier to commutate the three-phase AC power into the direct current source, use the pure inductive load on the direct current side, can output the harmonic current of 6k + -1 times, the targeted analog frequency converter, medium frequency furnace or UPS harmonic current characteristic, while sending out the inductive reactive power, can also send out the characteristic harmonic more than 5, 7, 11, 13 times; the other type is that by using a power electronic conversion technology, an advanced full-control device IGBT is adopted to rectify a three-phase alternating current power supply into a direct current voltage source, current loop constant current control is adopted to output controlled reactive current and harmonic current, and the range of output harmonic current can be selected, such as fundamental wave reactive current, harmonic current from 2 nd to 50 th or the combination of several of the fundamental wave reactive current, the harmonic current from 2 nd to 50 th.
The harmonic generators of the above two types generate harmonic waves of integral multiples of power frequency, and the actual system is often subjected to harmonic interference of continuous frequency spectrum. Therefore, a reactive and continuous spectrum harmonic comprehensive generator is needed in the harmonic interference test.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that needs solve provides a can export idle and continuous spectrum harmonic's comprehensive generator, satisfies harmonic controlgear's detection requirement.
In order to solve the technical problem, the utility model adopts the following technical proposal.
A reactive and continuous frequency spectrum harmonic comprehensive generator comprises a voltage transformer, a current transformer, a waveform data playback device, a comprehensive calculation controller and a full-control power electronic cascade module amplifying device;
the voltage transformer is used for collecting three voltage signals of a tested power grid and sending the three voltage signals to the comprehensive calculation controller; the current transformer is used for acquiring three current signals of a tested power grid and sending the three current signals to the comprehensive calculation controller; the waveform data playback device is used for setting preset waveform data according to experimental requirements and outputting the preset waveform data to the comprehensive calculation controller as a signal source;
the comprehensive calculation controller performs ip-iq calculation according to preset waveform data and extracts full harmonic components; performing ip-iq calculation according to the three-phase voltage and current signals, extracting reactive components, synthesizing full harmonic components and the reactive components to be used as command currents, and performing phase-shifting PWM (pulse width modulation), namely SPWM (sinusoidal pulse width modulation) calculation according to the command currents to obtain all IGBT on-off control signals of the full-control power electronic cascade module amplifying device;
and the full-control power electronic cascade module amplifying device outputs reactive power and continuous frequency spectrum harmonic waves according to the IGBT on-off control signal sent by the comprehensive calculation controller.
Above-mentioned idle and continuous frequency spectrum harmonic synthesize generator, synthesize calculation controller including the two FPGA modules and the DSP module that set up side by side, voltage transformer and current transformer's output is connected to the input of first FPGA module, the output of waveform data playback device is connected to the input of second FPGA module, two FPGA module output are connected with the input of DSP module respectively, the controlled end of full control power electronics cascade module amplification device is connected to the output of DSP module, the required idle and continuous frequency spectrum harmonic of output of full control power electronics cascade module amplification device.
According to the reactive and continuous frequency spectrum harmonic comprehensive generator, the waveform data playback device is a relay protection instrument with a waveform output function or an industrial personal computer with a D/A output module.
In the above reactive and continuous spectrum harmonic integrated generator, the fully-controlled power electronic cascade module amplifying device includes amplifying branches respectively connected to the A, B, C three-phase lines of the tested power grid; the amplifying branch circuit comprises an amplifying circuit formed by cascading N H-bridge circuits, and an inductor Ls and a resistor Rs which are connected between the amplifying circuit and a tested power grid in series.
According to the reactive and continuous frequency spectrum harmonic comprehensive generator, the H-bridge circuit comprises four IGBT transistors which are connected in an H-bridge mode, a filtering branch circuit is connected between the non-input end and the non-output end of the H-bridge circuit in parallel, and the filtering branch circuit comprises a capacitor, a resistor and a voltage stabilizing tube which are connected in parallel.
Due to the adoption of the technical scheme, the utility model has the following technical progress.
The utility model discloses a two FPGA module parallel operation, synchronous extraction is tried the reactive component of power system and is predetermine the full harmonic component of wave form, combine the DSP module to carry out SPWM calculation and output control signal, control full accuse power electronics cascades module amplification device output idle and continuous frequency spectrum harmonic, because do not adopt frequency domain algorithms such as DFT, the harmonic component of predetermineeing the wave form does not receive any loss, thereby output and experiment required idle and continuous frequency spectrum harmonic, satisfy the detection requirement to harmonic control equipment and other idle harmonic comprehensive test environment's demand.
Drawings
Fig. 1 is an electrical schematic diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
A reactive and continuous frequency spectrum harmonic comprehensive generator comprises a three-phase voltage transformer, a three-phase current transformer, a waveform data playback device, a comprehensive calculation controller and a fully-controlled power electronic cascade module amplifying device, wherein the connection relation among all electrical equipment is shown in figure 1, and the reactive and continuous frequency spectrum harmonic comprehensive generator specifically comprises the following components: the input end of the comprehensive calculation controller is respectively connected with the output ends of the three-phase voltage transformer, the three-phase current transformer and the waveform data playback device, the output end of the comprehensive calculation controller is connected with the controlled end of the full-control power electronic cascade module amplifying device, and the full-control power electronic cascade module amplifying device outputs reactive power and continuous spectrum harmonic waves according to IGBT on-off control signals sent by the comprehensive calculation controller.
The voltage transformer is used for collecting three voltage signals of a tested power grid and sending the three voltage signals to the comprehensive calculation controller; the current transformer is used for collecting three current signals of the tested power grid and sending the three current signals to the comprehensive calculation controller.
The waveform data playback device is used for setting preset waveform data according to experimental requirements and outputting the preset waveform data to the comprehensive calculation controller as a signal source. The waveform data playback device is a relay protection instrument with a waveform output function or an industrial personal computer with a D/A output module. The preset waveform can be actual waveform data recorded by various fault recording devices on site, and can also be calculated by various simulation software to obtain the preset waveform data.
The comprehensive calculation controller is used for performing ip-iq calculation according to preset waveform data and extracting full harmonic components; and performing ip-iq calculation according to the three-phase voltage and current signals, extracting reactive components, synthesizing full harmonic components and the reactive components to be used as command currents, and performing phase-shifting PWM (pulse width modulation), namely SPWM (sinusoidal pulse width modulation) calculation according to the command currents to obtain all IGBT on-off control signals of the full-control power electronic cascade module amplifying device.
The utility model discloses in, synthesize the calculation controller including the two FPGA modules and the DSP module that set up side by side. The input end of the first FPGA module is connected with the output ends of the voltage transformer and the current transformer to realize the calculation of the reactive component; the input end of the second FPGA module is connected with the output end of the waveform data playback device, so that the calculation of the full harmonic component is realized; the output end of the double FPGA modules is respectively connected with the input end of the DSP module, the DSP module realizes the synthesis of full harmonic component and reactive component and carries out SPWM calculation, the output end of the DSP module is connected with the controlled end of the full-control power electronic cascade module amplifying device, and the output end of the full-control power electronic cascade module amplifying device outputs the required reactive power and continuous frequency spectrum harmonic.
The structure of the fully-controlled power electronic cascade module amplifying device is shown in fig. 1, and comprises amplifying branches which are respectively connected with three-phase lines of a tested power grid A, B, C. The amplifying branch circuit comprises an amplifying circuit HB formed by cascading N H-bridge circuits, and an inductor Ls and a resistor Rs which are connected between the amplifying circuit and a tested power grid in series; the utility model discloses when using in the 10kV system to carry out the experiment, can set up 10-12H bridge circuit in every enlarged branch road. The H-bridge circuit comprises four IGBT transistors connected in an H-bridge mode, a filtering branch circuit is connected between the non-input end and the non-output end of the H-bridge circuit in parallel, and the filtering branch circuit comprises a capacitor, a resistor and a voltage stabilizing tube which are connected in parallel.
The utility model discloses a theory of operation does: the voltage transformer collects three voltage signals u of the tested power gridsc、usb、uscThe current transformer collects three current signals i of the tested power grida、ib、icAnd the reactive component is sent to a first FPGA module FPGA1 of the comprehensive calculation controller, and a reactive component is extracted by the first FPGA module FPGA 1; waveform data playback apparatus inputs preset waveform isa、isb、iscSending the preset waveform data to a second FPGA module FPGA2, and extracting a full harmonic component by the second FPGA module FPGA 2; the DSP module synthesizes the full harmonic component and the reactive component to be used as instruction current, phase-shifting PWM (pulse width modulation), namely SPWM (sinusoidal pulse width modulation) calculation is carried out according to the instruction current, all IGBT on-off control signals of the full-control power electronic cascade module amplifying device are obtained, and the signals are transmitted to the full-control power electronic cascade module amplifying device. Each IGBT transistor in the H-bridge circuit of the full-control power electronic cascade module amplifying device acts according to the received on-off control signal, so that the full-control power electronic cascade module amplifying device outputs corresponding reactive and continuous frequency spectrum harmonic current i to the loadla、ilb、ilc。
Claims (5)
1. A reactive and continuous frequency spectrum harmonic comprehensive generator is characterized in that: the device comprises a voltage transformer, a current transformer, a waveform data playback device, a comprehensive calculation controller and a full-control power electronic cascade module amplifying device;
the voltage transformer is used for collecting three voltage signals of a tested power grid and sending the three voltage signals to the comprehensive calculation controller;
the current transformer is used for acquiring three current signals of a tested power grid and sending the three current signals to the comprehensive calculation controller;
the waveform data playback device is used for setting preset waveform data according to experimental requirements and outputting the preset waveform data to the comprehensive calculation controller as a signal source;
the comprehensive calculation controller performs ip-iq calculation according to preset waveform data and extracts full harmonic components; performing ip-iq calculation according to the three-phase voltage and current signals, extracting reactive components, synthesizing full harmonic components and the reactive components to be used as command currents, and performing phase-shifting PWM (pulse width modulation), namely SPWM (sinusoidal pulse width modulation) calculation according to the command currents to obtain all IGBT on-off control signals of the full-control power electronic cascade module amplifying device;
and the full-control power electronic cascade module amplifying device outputs reactive power and continuous frequency spectrum harmonic waves according to the IGBT on-off control signal sent by the comprehensive calculation controller.
2. A reactive and continuous spectrum harmonic synthesis generator as claimed in claim 1, wherein: the comprehensive calculation controller comprises double FPGA modules and a DSP module which are arranged in parallel, the input end of the first FPGA module is connected with the output ends of a voltage transformer and a current transformer, the input end of the second FPGA module is connected with the output end of a waveform data playback device, the output ends of the double FPGA modules are respectively connected with the input end of the DSP module, the output end of the DSP module is connected with the controlled end of the full-control power electronic cascade module amplifying device, and the output end of the full-control power electronic cascade module amplifying device outputs required reactive power and continuous spectrum harmonic waves.
3. A reactive and continuous spectrum harmonic synthesis generator as claimed in claim 1, wherein: the waveform data playback device is a relay protection instrument with a waveform output function or an industrial personal computer with a D/A output module.
4. A reactive and continuous spectrum harmonic synthesis generator as claimed in claim 1, wherein: the fully-controlled power electronic cascade module amplifying device comprises amplifying branches which are respectively connected with three-phase lines of a tested power grid A, B, C; the amplifying branch circuit comprises an amplifying circuit formed by cascading N H-bridge circuits, and an inductor Ls and a resistor Rs which are connected between the amplifying circuit and a tested power grid in series.
5. The reactive and continuous spectrum harmonic synthesis generator of claim 4, wherein: the H-bridge circuit comprises four IGBT transistors connected in an H-bridge mode, a filtering branch circuit is connected between the non-input end and the non-output end of the H-bridge circuit in parallel, and the filtering branch circuit comprises a capacitor, a resistor and a voltage stabilizing tube which are connected in parallel.
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| CN201920865915.7U CN210269937U (en) | 2019-06-11 | 2019-06-11 | Reactive and continuous frequency spectrum harmonic comprehensive generator |
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| CN201920865915.7U CN210269937U (en) | 2019-06-11 | 2019-06-11 | Reactive and continuous frequency spectrum harmonic comprehensive generator |
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Effective date of registration: 20200903 Address after: Yunda economic and Technological Development Zone in Yunnan province Kunming city 650217 West Road No. 105 Patentee after: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute Address before: Yunda economic and Technological Development Zone in Yunnan province Kunming City 650000 West Road No. 105 Co-patentee before: HEBEI XUHUI ELECTRIC Co.,Ltd. Patentee before: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute |
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