CN204179661U - A kind of power supply quality test device with random perturbation function - Google Patents
A kind of power supply quality test device with random perturbation function Download PDFInfo
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Abstract
The utility model discloses a kind of power supply quality test device with random perturbation function, this device comprises three-phase converter transformer, Three-phase electronic gear adjuster, three-phase thyristor opening-closing capacitor bank, converter circuit, distribution transformer and distribution switchgear cabinet, power amplification circuit, DSP control module sum functions generator; The beneficial effects of the utility model are by three-phase converter transformer access 380V distribution network line, harmonic voltage source and the harmonic current source with random perturbation is generated under sending different control commands by DSP control module, simultaneously also can outputting standard harmonic voltage source and current source, and the power quality problem such as power network overvoltage, under voltage, voltage dip, Voltage unbalance with different depth can be produced under modulation signal.
Description
Technical Field
The utility model relates to an electric energy quality test device especially relates to an electric energy quality test device with function of disturbing at random, belongs to the simulation experiment equipment field.
Background
With the continuous development of electric power systems, a large number of nonlinear loads such as arc furnaces, power converters and the like bring problems of harmonic waves, voltage sag, voltage unbalance and the like to the systems, and meanwhile, power supply enterprises and power consumers have higher and higher requirements on the quality of electric energy, so that devices for improving the quality of electric energy mainly comprise passive filters, active filters, dynamic voltage restorers, unified electric energy quality regulators, static and dynamic reactive power compensators and the like, which are developed and put into operation in industry. The devices are mainly used for power quality control and the like, but no comprehensive power quality device which can be used for simulation test research of scientific research personnel exists, so that a power quality test device with a random disturbance function is needed to be provided, and the device is used for outputting a harmonic voltage source or a harmonic current source with random disturbance and simulating power quality problems of power grid overvoltage or undervoltage, voltage sag, voltage unbalance and the like.
The chinese utility model 201410276035.8 "an electric energy quality harmonic disturbance source platform" discloses a voltage source capable of outputting 0 to 50 harmonics and superimposed standard harmonic voltages under the conditions of 10KV and 0.38KV fundamental voltage, so as to simulate the power grid sag, fluctuation and unbalanced three-phase electric energy quality problems. The main defects that a harmonic voltage source cannot be output by a series voltage disturbance device of Chinese invention patent 200810020372.5 and an energy feedback type power quality disturbance device of utility model patent 200820080190.2 are improved. However, the chinese utility model 201410276035.8, "a power quality harmonic disturbance source platform", cannot output harmonic sources with random disturbance, and can only output fixed harmonics; the realization of the voltage sag function is single, and specific types of faults are not generated according to the characteristic quantities of different voltage sag types; it is not possible to output different overvoltage and undervoltage to each phase, but only the same three-phase overvoltage and undervoltage can be output.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved in the utility model is to provide an electric energy quality test device that has the random disturbance function that the function is comprehensive, convenient to use.
The utility model provides a technical scheme that its technical problem adopted:
a power quality test device with a random disturbance function comprises a three-phase converter transformer, a three-phase electronic gear regulator, a three-phase thyristor switched capacitor bank, a converter circuit, a distribution transformer, a distribution switch cabinet, a power amplification circuit, a DSP control module and a function generator;
the primary side of the three-phase converter transformer is connected with a three-phase power supply line, and the secondary side of the three-phase converter transformer is connected with a three-phase electronic gear regulator, a three-phase thyristor switched capacitor bank and the inlet wire input end of a converter circuit respectively; the control signal output end of the DSP control module is respectively connected with the control signal receiving ends of the three-phase electronic gear adjuster, the three-phase thyristor switched capacitor bank and the converter circuit, the output ends of the three-phase electronic gear adjuster, the three-phase thyristor switched capacitor bank and the converter circuit are respectively connected with the corresponding input ends of the distribution transformer and the distribution switch cabinet, the output ends of the distribution transformer and the distribution switch cabinet are connected with the power input end of a load, and the random harmonic signal output end of the function generator is superposed on the output ends of the distribution transformer and the distribution switch cabinet after passing through the power amplification circuit and then is input into the power input end of the load.
The device can generate a harmonic voltage source and a harmonic current source with random disturbance under different control instructions, and can modulate disturbance types or faults such as power grid overvoltage, undervoltage, voltage sag, voltage unbalance and the like.
Further, the distribution transformer and the distribution switch cabinet comprise a distribution switch and a distribution transformer; the output ends of the three-phase electronic gear regulator, the three-phase thyristor switched capacitor bank and the converter circuit are connected with the input end of a distribution transformer, the output end of the distribution transformer is connected with the input end of a distribution switch, and the output end of the distribution switch is connected with the power input end of a load.
Furthermore, the three-phase electronic gear adjuster comprises three single-phase electronic gear adjusters with the same structure, the three single-phase electronic gear adjusters with the same structure are connected in parallel to form 4 input ports and 3 output ports, 3 input ports of the 4 input ports are respectively connected with 3 output ends of the three-phase converter transformer, and the other 1 input port is grounded; each single-phase electronic gear regulator comprises 5 bidirectional thyristor thyristors and 1 autotransformer; the main poles T1 of the 5 bidirectional thyristor thyristors are correspondingly connected to 1 output end of the three-phase converter transformer, the secondary poles T2 are respectively connected to the input tap ends of the autotransformer at different levels, and the control pole G of the bidirectional thyristor thyristors is connected with the control signal output end of the DSP control module.
The three-phase electronic gear regulator triggers the bidirectional thyristor to realize the rapid switching of gears by receiving a control signal sent by the DSP control module, thereby realizing the switching on and off of energy transmission.
Further, the three-phase thyristor switched capacitor bank comprises three unidirectional thyristor switched capacitors with the same structure, and the three unidirectional thyristor switched capacitors with the same structure are connected in parallel; each unidirectional thyristor switching capacitor comprises 2 unidirectional thyristors and a switching capacitor, and the 2 unidirectional thyristors are reversely connected in parallel and then are connected in series with the switching capacitor; and the control electrode G of the unidirectional thyristor is connected with the control signal output end of the DSP control module. The triac and the triac are commonly referred to as a switching tube as is well known to those skilled in the art.
The three-phase thyristor switched capacitor bank adopts two single-phase thyristors which are connected in parallel in an inverted mode and is connected with a capacitor in series to realize the connection or disconnection of the three-phase thyristor switched capacitor bank into or from a power grid; the three-phase thyristor switched capacitor bank also comprises 3 choke inductors, and the 3 choke inductors are respectively connected with the 3 unidirectional thyristor switched capacitors in series correspondingly; the choke inductance is used for suppressing a surge current which may be caused when the capacitor is put into a power grid.
Further, the converter circuit comprises a three-phase full-bridge rectification circuit, an energy storage capacitor C and a three-phase full-bridge inversion circuit; the circuit formed by the three-phase full-bridge rectification circuit and the three-phase full-bridge inverter circuit is two three-phase voltage type PWM power converters which are connected in reverse and have the same structure; the output end of the three-phase full-bridge rectification circuit is connected with the input end of the three-phase full-bridge inverter circuit; the energy storage capacitor C is connected in parallel at two ends of the output end of the three-phase full-bridge rectifying circuit; and the control electrode G of each switching tube in the three-phase voltage type PWM power converter is connected with the control signal output end of the DSP control module.
Furthermore, the secondary side of the three-phase converter transformer is connected with the three-phase electronic gear regulator, the three-phase thyristor switched capacitor bank and the inlet wire input end of the converter circuit respectively after passing through the three-phase filter inductor.
Furthermore, the three-phase converter transformer inputs electric energy into a system from a power grid and plays a role of electrical isolation, the primary side of the three-phase converter transformer is connected in a star shape and connected to a three-phase power supply line, the secondary side of the three-phase converter transformer is connected in a triangle shape, and the output of the secondary side of the three-phase converter transformer is respectively connected in parallel with a three-phase electronic gear regulator, a three-phase thyristor switched capacitor bank and a converter circuit after being filtered by a three-phase filter inductor; the electric isolation function of the disturbance device and the power grid can be realized, and meanwhile, the energy transmission is realized.
Further, the three-phase thyristor switched capacitor bank further comprises 3 choke inductors; the 3 choke inductors are respectively connected in series with the 3 unidirectional thyristor switched capacitors.
Furthermore, the converter circuit further comprises an incoming line filter inductor and an outgoing line filter inductor; the input ends of the converter circuits are respectively connected with the incoming line filter inductors, and the output ends of the converter circuits are respectively connected with the outgoing line filter inductors.
Further, the model of the DSP control module is TMS320F28335PGFA, and the power amplification circuit performs power amplification on the analog signal generated by the function generator. The DSP control module is used for generating control signals and controlling each switching tube in the circuit.
The utility model discloses utilize function generator and power amplification circuit combination to control the harmonic voltage current output that produces and have random disturbance. The model of the function generator is an AFG2000 arbitrary function generator.
The utility model has the advantages as follows:
the utility model is used as a disturbance device for researchers to carry out experimental research and is used for checking the stability and performance of the equipment operated by the power grid under various fault working conditions; the harmonic voltage source and the harmonic current source with random disturbance can be simulated, and overvoltage and undervoltage of different depths of a power grid are simulated by controlling the three-phase electronic gear regulator; simulating different types of voltage sags by controlling the converter circuit; utilize unbalanced scheduling problem of control analog voltage of three-phase thyristor switched capacitor group, provide test platform for colleges and universities or scientific research institute personnel, the utility model discloses each module is independent control respectively, and control is simple, the integration platform of being convenient for install and realizing.
Drawings
Fig. 1 is a schematic structural composition diagram of the present invention.
Fig. 2 is the utility model discloses well three-phase electron keeps off position regulator schematic structure.
Fig. 3 is the circuit structure schematic diagram of the three-phase thyristor switched capacitor bank of the utility model.
Fig. 4 is a schematic circuit diagram of the inverter circuit of the present invention.
The system comprises a three-phase converter transformer 1, a three-phase electronic gear regulator 2, a three-phase thyristor switched capacitor bank 3, a converter circuit 4, a distribution transformer 5, a distribution switch cabinet 6, a power amplification circuit 7, a DSP control module 7 and a function generator 8.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings 1 to 4 and the embodiments:
as can be seen from the embodiment shown in fig. 1, the embodiment includes a three-phase converter transformer 1, a three-phase electronic gear regulator 2, a three-phase thyristor switched capacitor bank 3, a converter circuit 4, a distribution transformer and distribution switch cabinet 5, a power amplification circuit 6, a DSP control module 7, and an AFG2000 arbitrary function generator 8;
the primary side of the three-phase converter transformer 1 is connected with a three-phase power supply line, and the secondary side of the three-phase converter transformer is connected with a three-phase electronic gear regulator 2, a three-phase thyristor switched capacitor bank 3 and a converter circuit 4 respectively; DSP control module 7's control signal output connects three-phase electron gear regulator 2, three-phase thyristor switched capacitor group 3 and converter circuit 4's control signal receiving terminal respectively, three-phase electron gear regulator 2, three-phase thyristor switched capacitor group 3 and converter circuit 4's output connect distribution transformer and distribution cubical switchboard 5's corresponding input respectively, distribution transformer and distribution cubical switchboard 5 output access load's power input end, the random harmonic signal output that AFG2000 arbitrary function generator 8 generated superposes after carrying out power amplification through power amplification circuit 6 and inputs again at distribution transformer and distribution cubical switchboard 5 output the power input end of load.
The device can generate a harmonic voltage source and a harmonic current source with random disturbance under different control instructions, and can modulate disturbance types or faults such as power grid overvoltage, undervoltage, voltage sag, voltage unbalance and the like.
The three-phase converter transformer 1 inputs electric energy into a system from a power grid and plays a role of electrical isolation, a primary side of the transformer is connected to a three-phase power supply circuit in a star shape, a secondary side of the transformer is connected to a triangle shape, and output of the secondary side of the transformer is filtered by a three-phase filter inductor and then is respectively connected with a three-phase electronic gear regulator 2, a three-phase thyristor switched capacitor bank 3 and two converter circuits 4 which are connected in reverse direction in parallel; the electric isolation function of the disturbance device and the power grid can be realized, and meanwhile, the energy transmission is realized.
As shown in fig. 2, the three-phase electronic gear adjuster 2 includes three single-phase electronic gear adjusters with the same structure, and the three single-phase electronic gear adjusters with the same structure are connected in parallel to form 4 port inputs and 3 port outputs, wherein 3 ports of the 4 port inputs are connected to the output end of the three-phase converter transformer, and 1 port is grounded; the single-phase electronic gear regulator comprises 5 bidirectional thyristor thyristors and 1 autotransformer; the main poles T1 of the 5 bidirectional thyristor thyristors are all connected at the input end of the incoming line, the secondary poles T2 are respectively connected at the input tap ends of the autotransformer in different grades, and the control pole G of the bidirectional thyristor thyristors is used for receiving control signals. The three-phase electronic gear regulator 2 is triggered by receiving the control signal to realize the rapid gear switching of the bidirectional thyristor, thereby realizing the switching on and off of energy transmission.
As shown in fig. 3, the three-phase thyristor switched capacitor bank 3 includes three unidirectional thyristor switched capacitors with the same structure, and the three unidirectional thyristor switched capacitors with the same structure are connected in parallel; the control electrode G is used for receiving a control signal, and the unidirectional thyristor switching capacitor comprises two unidirectional thyristors and a switching capacitor; and the two unidirectional crystal valve tubes are reversely connected in parallel and then are connected in series with the switching capacitor. The three-phase thyristor switched capacitor bank 3 adopts two single-phase thyristors which are connected in parallel in an inverted mode and a capacitor in series to realize the connection or disconnection of the three-phase thyristor switched capacitor bank 3 into or from a power grid; the three-phase thyristor switched capacitor bank 3 further comprises three choke inductors, and the three choke inductors are respectively connected with the three unidirectional thyristor switched capacitors in series correspondingly; the three series-connected choke inductors are used for suppressing the surge current which can be caused when the capacitor is put into a power grid.
As shown in fig. 4, the two inverter circuits 4 connected in opposite directions include a three-phase full-bridge rectification circuit, an energy storage capacitor C and a three-phase full-bridge inverter; the three-phase full-bridge rectifier circuit and the three-phase full-bridge inverter are two three-phase voltage type PWM converters which are connected reversely, the output end of the three-phase full-bridge rectifier circuit is connected with the input end of the three-phase full-bridge inverter, and the energy storage capacitor C is connected to two ends of the output end of the three-phase full-bridge rectifier circuit in parallel.
The model of the DSP control module 7 is TMS320F28335 PGFA. The power amplification circuit 6 performs power amplification on the analog signal generated by the AFG2000 arbitrary function generator 8. The DSP control module 7 is used for generating control signals to control each switching tube in the circuit, and the switching tubes comprise a bidirectional thyristor and a single-phase thyristor. The utility model discloses utilize AFG2000 arbitrary function generator 8 and power amplifier circuit 6 combination to control the harmonic voltage current output that produces and have random disturbance.
The implementation and the realization of the beneficial effects of the utility model are only based on the hardware combination.
The utility model discloses a following two kinds of mode:
(I) voltage source working mode:
wherein the voltage source operating mode includes the following functions:
1 harmonic voltage source generator function with random disturbance function
An AFG2000 type arbitrary function generator produced by Tektronix company is adopted to generate the following analog signals: a sinusoidal harmonic component + a triangular wave signal; the mixed signal of the sine harmonic part and the triangular wave signal has randomness by changing the amplitude or the frequency of the triangular wave signal.
Wherein:
the sinusoidal harmonic part = fundamental positive sequence voltage amplitude or effective value + fundamental negative sequence voltage amplitude or effective value + fundamental positive sequence voltage phase + fundamental negative sequence voltage phase + positive sequence 2 to 60 order harmonic voltage amplitude or effective value + negative sequence 2 to 60 order harmonic voltage amplitude or effective value + positive sequence 2 to 60 order harmonic voltage phase + negative sequence 2 to 60 order harmonic voltage phase + voltage reference frequency;
（1）
wherein:a voltage generated for an AFG2000 model arbitrary function generator;
is the fundamental positive sequence voltage amplitude;
is the fundamental negative sequence voltage amplitude;
is a 2 to 60 positive sequence harmonic voltage amplitude;
is a negative sequence harmonic voltage amplitude of 2 to 60;
is the fundamental wave positive sequence voltage phase angle;
is the fundamental negative sequence voltage phase angle;
is a positive sequence harmonic voltage phase angle;
is the negative sequence harmonic voltage phase angle;
h is the harmonic frequency;
2 overvoltage/undervoltage mode function:
the overvoltage is the phenomenon that the duration of the device exceeds 1 minute under the power frequency condition, and the root mean square value of the alternating voltage is increased to exceed a rated value by 110%;
under-voltage is the phenomenon that the duration of the device under the power frequency condition exceeds 1 minute, and the root mean square value of the alternating voltage is reduced to exceed the rated value by 90%.
The mechanism of the device for generating overvoltage is specifically described by a single-phase electronic gear regulator shown in the attached figure 2, the DSP control module 7 generates a control signal to switch on and off the electronic gear regulator at any time, when the low-proportion K4 or K5 gear is selected for overvoltage, the voltage output exceeds a rated value by 110%, the duration of the controlled bidirectional thyristor on-time exceeds 1 minute, and the overvoltage regulation range of 110% -150% can be realized. The three independent single-phase electronic gear regulators respectively and independently control three-phase voltage, so that one-phase overvoltage, two-phase overvoltage and three-phase overvoltage can be realized; similarly, the mechanism of generating the undervoltage is that the DSP control module 7 generates a control signal to switch on and off the electronic gear regulator at any time, the high-proportion gear K1 or K2 is selected for overvoltage, the voltage output is lower than the rated value by 90%, and the duration of controlling the on-state of the bidirectional thyristor exceeds 1 minute. Three independent single-phase electronic gear regulators respectively control three-phase voltage, so that one-phase undervoltage, two-phase undervoltage and three-phase undervoltage can be realized. And the overvoltage and undervoltage of a certain phase can be realized simultaneously. The gears K1, K2, K3, K4 and K5 are 5 taps of the autotransformer respectively.
3 Voltage unbalance mode function:
the voltage unbalance refers to the maximum deviation of the average value of three-phase voltage, and the unbalance degree epsilon of the three-phase voltage is expressed as follows:
wherein,is the value of the deviation,is an average value;
the mechanism of the device for generating voltage unbalance is illustrated by the attached drawing 3, a DSP control module 7 is used for generating control signals to control the on and off of the thyristor, so that a certain phase capacitor of a three-phase thyristor switched capacitor bank 3 is switched to cause single-phase load unbalance, and the voltage unbalance with the rate lower than 2% can be simulated.
4 voltage sag mode:
the voltage sag refers to the phenomenon that the root mean square value of the voltage is reduced to 0.1-0.9p.u. under the power frequency state, and the duration is from 0.5 cycle to 1 minute.
The mechanism of the device for generating voltage sag is illustrated by the attached figure 4, and two reversely connected three-phase voltage type PWM current transformers are taken as a main circuit. All power switch tubes adopt Insulated Gate Bipolar Transistors (IGBT). The method comprises the steps of respectively constructing characteristic quantities of the voltage sag of a power system according to seven types of the voltage sag, enabling a grid-side converter to work in a rectification mode according to the characteristic quantities of various types of the voltage sag as control signals, enabling a sag generation-side converter to work in an inversion mode, and changing trigger pulses of SVPWM according to the required sag to realize different types of voltage sag.
(II) current source working mode:
harmonic current source function with random disturbance
The following analog signals were generated using an AFG2000 model arbitrary function generator manufactured by Tektronix corporation consisting of two parts: a sinusoidal harmonic component + a triangular wave signal; the mixed signal of the sine harmonic part + the triangular wave signal is made to have randomness by changing the amplitude or frequency of the triangular wave signal.
Wherein:
the sine harmonic part = fundamental positive sequence current amplitude or effective value + fundamental negative sequence current amplitude or effective value + fundamental positive sequence current phase + fundamental negative sequence current phase + positive sequence 2 to 60 order harmonic current amplitude or effective value + negative sequence 2 to 60 order harmonic current amplitude or effective value + positive sequence 2 to 60 order harmonic current phase + negative sequence 2 to 60 order harmonic current phase + current reference frequency;
（2）
wherein:a current generated for an AFG2000 model arbitrary function generator;
is the fundamental positive sequence current amplitude;
is the fundamental negative sequence current amplitude;
is 2 to 60 positive sequence harmonic current amplitude;
is 2 to 60 negative sequence harmonic current amplitude;
is the fundamental wave positive sequence current phase angle;
is the fundamental negative sequence current phase angle;
is a positive sequence harmonic current phase angle;
is the negative sequence harmonic current phase angle;
the three-phase converter transformer 1 inputs electric energy into a system from a power grid and plays a role of electrical isolation, a primary side of the transformer is connected to a three-phase power supply circuit in a star shape, a secondary side of the transformer is connected to a triangle shape, and output of the secondary side of the transformer is filtered by a three-phase filter inductor and then is respectively connected with a three-phase electronic gear regulator 2, a three-phase thyristor switched capacitor bank 3 and two converter circuits 4 which are connected in reverse directions in parallel. When the three-phase electronic gear regulator 2, the three-phase thyristor switched capacitor bank 3 and the two reversely connected converter circuits 4 respectively work, the outputs of the three-phase electronic gear regulator are respectively connected to the distribution switch and the transformer cabinet 5 so as to supply power to the load, thereby realizing different functions. When the DSP control module 7 sends out a control signal to enable the three-phase electronic gear regulator 2 to work, the device realizes the overvoltage or undervoltage function at the moment; when the DSP control module 7 sends out a control signal to enable the three-phase thyristor switched capacitor bank 3 to work, the device realizes the function of voltage unbalance; when the DSP control module 7 sends out a control signal to enable the two converter circuits 4 which are connected in the opposite direction to work, the device realizes the function of voltage unbalance. When the AFG2000 arbitrary function generator sends out a generated harmonic signal, the generated harmonic signal with random disturbance is amplified by the power amplifier 6, so that the device is in the function of outputting a harmonic voltage source or a harmonic current source. When the load needs to simulate an overvoltage or undervoltage or voltage sag or voltage unbalance fault with random disturbance harmonic disturbance, the AFG2000 arbitrary function generator 8 generates a random harmonic signal, the random harmonic signal works through the power amplifier 6, and meanwhile, the DSP control module 7 outputs a control signal to enable the phase electronic gear regulator 2 or the three-phase thyristor switched capacitor bank 3 or the two converter circuits 4 which are reversely connected to each other to work.
The device is connected to a 380V power distribution network circuit through a three-phase converter transformer, generates a harmonic voltage source and a harmonic current source with random disturbance under different control instructions sent by a DSP control module, and can output a standard harmonic voltage source and a standard harmonic current source at the same time, and can also generate power quality problems of power grid overvoltage, undervoltage, voltage sag, voltage unbalance and the like with different depths under a modulation signal.
The above-described embodiments are merely preferred examples of the present invention and are not exhaustive of the possible implementations of the present invention. Any obvious modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the spirit and scope of the present invention.
Claims (10)
1. The utility model provides an electric energy quality test device with disturb function at random which characterized in that: the three-phase power supply comprises a three-phase converter transformer (1), a three-phase electronic gear regulator (2), a three-phase thyristor switched capacitor bank (3), a converter circuit (4), a distribution transformer and distribution switch cabinet (5), a power amplification circuit (6), a DSP control module (7) and a function generator (8);
the primary side of the three-phase converter transformer (1) is connected with a three-phase power supply line, and the secondary side of the three-phase converter transformer is connected with the three-phase electronic gear regulator (2), the three-phase thyristor switched capacitor bank (3) and the inlet wire input end of the converter circuit (4) respectively; the control signal output end of DSP control module (7) connects the control signal receiving end of three-phase electron fender position regulator (2), three-phase thyristor switched capacitor group (3) and converter circuit (4) respectively, the output of three-phase electron fender position regulator (2), three-phase thyristor switched capacitor group (3) and converter circuit (4) connects the corresponding input of distribution transformer and distribution cubical switchboard (5) respectively, the power input of load is inserted to distribution transformer and distribution cubical switchboard (5) output, the random harmonic signal output of function generator (8) superposes behind power amplifier circuit (6) and reinjects at distribution transformer and distribution cubical switchboard (5) output the power input of load.
2. The electric energy quality testing device with the random disturbance function according to claim 1, characterized in that: the distribution transformer and distribution switch cabinet (5) comprises a distribution switch and a distribution transformer; the output ends of the three-phase electronic gear regulator (2), the three-phase thyristor switched capacitor bank (3) and the converter circuit (4) are connected with the input end of a distribution transformer, the output end of the distribution transformer is connected with the input end of a distribution switch, and the output end of the distribution switch is connected with the power input end of a load.
3. The electric energy quality testing device with the random disturbance function according to claim 1, characterized in that: the three-phase electronic gear regulator (2) comprises three single-phase electronic gear regulators with the same structure, the three single-phase electronic gear regulators with the same structure are connected in parallel to form 4 input ports and 3 output ports, 3 input ports of the 4 input ports are respectively connected with 3 output ports of the three-phase converter transformer (1), and the other 1 input port is grounded; each single-phase electronic gear regulator comprises 5 bidirectional thyristor thyristors and 1 autotransformer; the main poles T1 of the 5 bidirectional thyristor thyristors are correspondingly connected to 1 output end of the three-phase converter transformer (1), the secondary poles T2 are respectively connected to the input tap ends of the autotransformer at different levels, and the control pole G of the bidirectional thyristor thyristors is connected with the control signal output end of the DSP control module (7).
4. The electric energy quality testing device with the random disturbance function according to claim 1, characterized in that: the three-phase thyristor switched capacitor bank (3) comprises three unidirectional thyristor switched capacitors with the same structure, and the three unidirectional thyristor switched capacitors with the same structure are connected in parallel; each unidirectional thyristor switching capacitor comprises 2 unidirectional thyristors and a switching capacitor, and the 2 unidirectional thyristors are reversely connected in parallel and then are connected in series with the switching capacitor; and a control electrode G of the unidirectional thyristor is connected with a control signal output end of the DSP control module (7).
5. The electric energy quality testing device with the random disturbance function according to claim 1, characterized in that: the converter circuit (4) comprises a three-phase full-bridge rectification circuit, an energy storage capacitor C and a three-phase full-bridge inverter circuit; the circuit formed by the three-phase full-bridge rectification circuit and the three-phase full-bridge inverter circuit is two three-phase voltage type PWM power converters which are connected in reverse and have the same structure; the output end of the three-phase full-bridge rectification circuit is connected with the input end of the three-phase full-bridge inverter circuit; the energy storage capacitor C is connected in parallel at two ends of the output end of the three-phase full-bridge rectifying circuit; and the control electrode G of each switching tube in the three-phase voltage type PWM power converter is connected with the control signal output end of the DSP control module (7).
6. The electric energy quality testing device with the random disturbance function according to claim 1, characterized in that: and the secondary side of the three-phase converter transformer (1) is respectively connected with the three-phase electronic gear regulator (2), the three-phase thyristor switched capacitor bank (3) and the inlet wire input end of the converter circuit (4) after passing through the three-phase filter inductor.
7. The electric energy quality testing device with the random disturbance function according to claim 1, characterized in that: the primary side of the three-phase converter transformer (1) is connected to a three-phase power supply line in a star shape, and the secondary side of the three-phase converter transformer is connected to the three-phase electronic gear regulator (2), the three-phase thyristor switched capacitor bank (3) and the inlet wire input end of the converter circuit (4) in a triangle shape.
8. The electric energy quality testing device with the random disturbance function according to claim 4, characterized in that: the three-phase thyristor switched capacitor bank (3) further comprises 3 choke inductors; the 3 choke inductors are respectively connected in series with the 3 unidirectional thyristor switched capacitors.
9. The electric energy quality testing device with the random disturbance function according to claim 5, characterized in that: the converter circuit (4) further comprises an incoming line filter inductor and an outgoing line filter inductor; the input ends of the converter circuits (4) are respectively connected with the incoming line filter inductors, and the output ends of the converter circuits are respectively connected with the outgoing line filter inductors.
10. The electric energy quality testing device with the random disturbance function according to claim 1, characterized in that: the model of the DSP control module (7) is TMS320F28335PGFA, and the model of the function generator (8) is an AFG2000 arbitrary function generator.
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| CN201420668983.1U CN204179661U (en) | 2014-11-11 | 2014-11-11 | A kind of power supply quality test device with random perturbation function |
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| CN201420668983.1U CN204179661U (en) | 2014-11-11 | 2014-11-11 | A kind of power supply quality test device with random perturbation function |
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| CN204179661U true CN204179661U (en) | 2015-02-25 |
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| CN201420668983.1U Expired - Fee Related CN204179661U (en) | 2014-11-11 | 2014-11-11 | A kind of power supply quality test device with random perturbation function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764958A (en) * | 2015-04-14 | 2015-07-08 | 国家电网公司 | Testing system of power quality control equipment |
| CN108199631A (en) * | 2018-02-06 | 2018-06-22 | 华北电力大学 | A kind of single-phase permanent magnet synchronous generator serial capacitors operating control device and method |
| CN115902682A (en) * | 2023-02-24 | 2023-04-04 | 中电装备山东电子有限公司 | Switching power supply overvoltage testing device |
-
2014
- 2014-11-11 CN CN201420668983.1U patent/CN204179661U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764958A (en) * | 2015-04-14 | 2015-07-08 | 国家电网公司 | Testing system of power quality control equipment |
| CN108199631A (en) * | 2018-02-06 | 2018-06-22 | 华北电力大学 | A kind of single-phase permanent magnet synchronous generator serial capacitors operating control device and method |
| CN115902682A (en) * | 2023-02-24 | 2023-04-04 | 中电装备山东电子有限公司 | Switching power supply overvoltage testing device |
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