CN209767395U - Voltage sag generator and voltage sag generating system - Google Patents
Voltage sag generator and voltage sag generating system Download PDFInfo
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- CN209767395U CN209767395U CN201920247863.7U CN201920247863U CN209767395U CN 209767395 U CN209767395 U CN 209767395U CN 201920247863 U CN201920247863 U CN 201920247863U CN 209767395 U CN209767395 U CN 209767395U
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Abstract
The present application relates to a voltage sag generator and a voltage sag generating system. The voltage sag generator comprises a three-phase rectifying circuit, a direct current bus capacitor, an inverter, a double digital signal control circuit and a communication circuit. The three-phase rectification circuit is used for converting alternating-current voltage into direct-current voltage. The direct current bus capacitor is connected with the three-phase rectifying circuit in parallel and used for storing electric energy. The inverter is electrically connected with the three-phase rectification circuit in a back-to-back manner and is used for outputting three-phase alternating-current voltage required by the load. The double-digital-signal control circuit is electrically connected with the inverter and used for generating the voltage sag and driving the inverter. The communication circuit is electrically connected with the double-digital signal control circuit and is used for remote transmission of data. The voltage sag generator can realize division of labor in the control process, so that the control precision and the operation efficiency of the voltage sag generator are improved. The voltage sag generator can integrate multiple functions, and the intelligent degree is higher. The real-time transmission of data can be completed through the communication circuit, and the data analysis process is facilitated.
Description
Technical Field
The present application relates to the field of power electronics technologies, and in particular, to a voltage sag generator and a voltage sag generating system.
Background
Since the eighties of the twentieth century, digital control technology has rapidly become popular and developed with the continuous development of information technology. Meanwhile, more and more automatic equipment is applied to modern industrial production and people's life. Various sensitive loads such as numerical control machine tools, network servers, medical equipment and automatic production lines are connected into a power system in a large quantity. Compared with the traditional equipment, the precision equipment takes a microprocessor or a computer as a core, so that the requirement on the power quality of a power grid is higher. In addition, in the traditional industries such as stock exchange centers, subways, paper making, telecommunications and elevators, relay protection devices in power systems are sensitive to the conditions of harmonic waves, overvoltage, voltage sag or sag of power grids. Any power quality problem may result in a fault, resulting in an interruption of production, communication or traffic.
At the same time, modern electrical load structures have changed significantly from the traditional ones. More and more power electronic devices are applied to production and life, such as reactive power compensation devices, thyristor rectification equipment on electric locomotives, electric arc furnaces and calcium carbide furnaces used by iron and steel smelting enterprises, converters in wind power generation, inverter groups in photovoltaic power generation and the like. The power electronic equipment brings convenience to people and simultaneously leads to rapid increase of nonlinear load in a power grid, so that various problems of power quality reduction, power grid frequency deviation increase, waveform distortion, voltage fluctuation, flicker and the like are caused, and a lot of hidden dangers are brought to the operation of a power system.
at present, researchers are dedicated to research on the influence of voltage sag on precision electric equipment, sensitive lighting lamps, alternating current contactors, low-voltage releases and the like. The adopted research means is mainly experimental research based on theoretical analysis. Therefore, in order to perform the targeted experiment, it is urgently needed to develop equipment which can generate various voltage signals and meets the national standard, so as to test the anti-interference characteristic of the equipment to be tested on the voltage quality. However, the current controller capable of simulating the generating device generating various voltage signals has the defects of insufficient intelligent degree, no remote communication capability and the like, so that the function is single and experimental data cannot be transmitted.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a voltage sag generator and a voltage sag generating system for solving the problems of insufficient intelligence and incapability of remote communication of the conventional voltage signal generating device.
A voltage sag generator comprising:
The three-phase rectification circuit is used for converting alternating-current voltage into direct-current voltage;
The direct current bus capacitor is connected with the three-phase rectifying circuit in parallel and used for storing electric energy;
The inverter is electrically connected with the three-phase rectifying circuit in a back-to-back mode and is used for outputting three-phase alternating voltage required by a load;
The double-digital signal control circuit is electrically connected with the inverter and is used for generating a voltage sag and driving the inverter; and
And the communication circuit is electrically connected with the double-digital-signal control circuit and is used for transmitting data.
in the voltage sag generator, the three-phase rectification circuit converts alternating-current voltage into direct-current voltage, and the direct-current bus capacitor is combined to provide a stable direct-current power supply for the inverter. The inverter is controlled by the double-digital-signal control circuit, so that accurate division of work in the control process can be realized, and the control precision and the operation efficiency of the voltage temporary generator are improved. In addition, the double-digital-signal control circuit can integrate multiple functions, and the intelligent degree of the voltage sag generator is improved. Through the communication circuit, the real-time transmission of data in the voltage temporary generator using process can be completed, and the real-time transmission of the data analyzing process is facilitated.
In one embodiment, the dual digital signal control circuit comprises:
The first digital signal control branch circuit is electrically connected with the inverter and is used for generating temporarily reduced voltage and driving the inverter; and
and the second digital signal control branch circuit is respectively electrically connected with the first digital signal control branch circuit and the communication circuit and is used for receiving the running state data of the first digital signal control branch circuit and exchanging data with the communication circuit.
in one embodiment, the dual digital signal control circuit further includes a dual port dynamic memory electrically connected to the first digital signal control branch and the second digital signal control branch, respectively, and located between the first digital signal control branch and the second digital signal control branch, where the first digital signal control branch and the second digital signal control branch exchange data through the dual port dynamic memory.
in one embodiment, the inverter further comprises a sampling circuit, which is electrically connected to the inverter, the first digital signal control branch and the second digital signal control branch, and is configured to collect three-phase current and voltage output by the inverter and transmit the three-phase current and voltage to the second digital signal control branch after receiving a first digital signal control instruction sent by the first digital signal control branch.
In one embodiment, the sampling circuit comprises:
A current sensor electrically connected to the inverter;
A voltage sensor electrically connected to the inverter; and
the sampler is electrically connected with the first digital signal control branch, the second digital signal control branch, the current sensor and the voltage sensor respectively, and is used for collecting current data of the current sensor and voltage data of the voltage sensor after receiving a first digital signal control instruction sent by the first digital signal control branch and transmitting the current data and the voltage data to the second digital signal control branch.
in one embodiment, the sampler is an A/D sampler.
In one embodiment, the display device further comprises a touch display screen electrically connected with the second digital signal control branch circuit and used for displaying data and inputting instructions.
In one embodiment, the inverter further comprises a filter circuit electrically connected with the inverter for filtering the output voltage and current of the inverter.
In one embodiment, the filter circuit is an LC filter circuit.
in one embodiment, the inverter further comprises a first circuit breaker, which is electrically connected with the filter circuit and used for controlling whether the output of the inverter is connected with a load or not.
in one embodiment, the three-phase rectification circuit further comprises a second circuit breaker, wherein the second circuit breaker is electrically connected with the three-phase rectification circuit and is used for connecting the three-phase rectification circuit with a power grid.
In one embodiment, the three-phase rectification circuit is a three-phase uncontrolled rectification bridge.
In one embodiment, the inverter is a two-level voltage source inverter.
in one embodiment, the inverter comprises insulated gate bipolar transistors.
A voltage sag generation system comprising:
A voltage sag generator, the voltage sag generator comprising:
The three-phase rectification circuit is used for converting alternating-current voltage into direct-current voltage;
The direct current bus capacitor is connected with the three-phase rectifying circuit in parallel and used for storing electric energy;
The inverter is electrically connected with the three-phase rectifying circuit in a back-to-back mode and is used for outputting three-phase alternating voltage required by a load;
The double-digital signal control circuit is electrically connected with the inverter and is used for generating a voltage sag and driving the inverter; and
the communication circuit is electrically connected with the double-digital-signal control circuit and is used for transmitting data; and the remote terminal is in communication connection with the communication circuit.
In the voltage sag generator and the voltage sag generating system provided in the above embodiments, the division of the first digital signal control branch and the second digital signal control branch is definite, so that the control accuracy and the operating efficiency of the voltage sag generator are obviously improved, and the expansibility of the voltage sag generator is enhanced. In addition, the first digital signal control branch circuit and the second digital signal control branch circuit can integrate more functions, and the requirement of multifunctional intellectualization is further met. The touch display screen can set relevant parameters of output voltage and acquire current running state parameters of the system, and has the advantages of convenience in operation, simplicity and intuition. The LC filter circuit is a passive filter circuit, can filter one or more times of harmonic waves, and has the advantage of good stability. The three-phase uncontrolled rectifier bridge has the advantages of high execution speed, suitability for high-voltage environment and the like. The insulated gate bipolar transistor has the advantages of small power, high switching speed, reduced saturation voltage and large capacity.
drawings
fig. 1 is a schematic diagram of an electrical connection relationship of a voltage sag generator according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of an electrical connection of another voltage sag generator according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit diagram of a voltage sag generator according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of an electrical connection relationship of a voltage sag generating system according to an embodiment of the present disclosure.
description of the reference numerals
100 voltage sag generator
10 three-phase rectification circuit
20 DC bus capacitor
30 inverter
40 double digital signal control circuit
410 first digital signal control branch
420 second digital signal control branch
430 dual port dynamic memory
50 communication circuit
60 sampling circuit
610 current sensor
620 voltage sensor
630 sampler
70 touch display screen
80 filter circuit
910 first circuit breaker
920 second circuit breaker
200 voltage sag generating system
210 remote terminal
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
it will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the present application provides a voltage sag generator 100. The voltage sag generator 100 includes a three-phase rectification circuit 10, a dc bus capacitor 20, an inverter 30, a dual digital signal control circuit 40, and a communication circuit 50. The three-phase rectifier circuit 10 is used to convert an ac voltage into a dc voltage. The direct current bus capacitor 20 is connected in parallel with the three-phase rectification circuit 10 and used for storing electric energy. The inverter 30 is electrically connected to the three-phase rectification circuit 10 in a back-to-back manner, and outputs a three-phase ac voltage required by a load. The dual digital signal control circuit 40 is electrically connected to the inverter 30, and is configured to generate a sag voltage and drive the inverter 30. The communication circuit 50 is electrically connected to the dual digital signal control circuit 40 for data transmission.
In one embodiment, the three-phase rectification circuit 10 is a three-phase uncontrolled rectifier bridge. It can be understood that the three-phase uncontrolled rectifying circuit is composed of rectifying diodes with uncontrolled function, which can change the applied ac voltage into dc voltage by using the unidirectional conductivity of the rectifying diodes. Because the on-off speed of the rectifier diode is high, the three-phase uncontrolled rectifier circuit can quickly finish the voltage conversion, and meanwhile, the obtained direct-current voltage cannot be adjusted. By using a bridge-type three-phase uncontrolled rectifier circuit, i.e. the three-phase uncontrolled rectifier bridge, the ac voltage of the power grid can be converted to a dc voltage suitable for the inverter 30 at high voltages.
The dc bus capacitor 20 is electrically connected to the three-phase rectification circuit 10, and the dc bus capacitor 20 can protect the inverter 30 from the impact of the instantaneous peak of the power grid. The inverter 30 is electrically connected to the three-phase rectification circuit 10 in a back-to-back manner. It is understood that the back-to-back connection is direct, i.e. the inverter 30 and the three-phase rectification circuit 10 share a dc-side voltage stabilizing capacitor. The dc side voltage stabilizing capacitor is the dc bus capacitor 20. The dc bus capacitor 20 and the three-phase rectification circuit 10 cooperate to provide a stable dc side voltage for the inverter 30.
in one embodiment, the inverter 30 is a two-level voltage source inverter. It can be understood that the power device of the two-level voltage source type inverter adopts a fully-controlled power switch. In one embodiment, the inverter 30 includes insulated-Gate Bipolar transistors (IGBTs). The insulated gate bipolar Transistor integrates the advantages of a Power Transistor (Giant Transistor, GTR) and a Power field effect Transistor (Power MOSFET), and has the advantages of small driving Power and high switching speed of an MOSFET device, and the bipolar device has the advantages of low saturation voltage and large capacity.
The dual digital signal control circuit 40 can control the inverter 30 to output a three-phase ac voltage with controllable amplitude and phase, i.e., can realize output simulation of the grid voltage in a normal operation, a sag state or a sag state. The control system of the dual-digital-signal control circuit 40 is designed by adopting a PI dual-closed-loop control method in digital PID control, and is combined with a space vector modulation algorithm (SVPWM) to serve as an overall control strategy. It can be understood that the PI double closed-loop control mode can accurately simulate three-phase abnormal conditions with adjustable amplitude, adjustable initial phase and adjustable duration according to a control instruction. The three-phase abnormal conditions comprise various abnormal conditions such as temporary drop, temporary rise, temporary drop or temporary rise of only one phase and the like. The modulation mode of the SVPWM can improve the quality of the voltage output waveform, thereby reducing the requirements on the output filter and facilitating the reduction of the cost of the voltage sag generator 100. The dual digital signal control circuit 40 may generate a corresponding PWM signal according to a setting, control the inverter 30 to output a pulse voltage, and output the pulse voltage to a load after being filtered by an output filter, so as to obtain a three-phase voltage waveform meeting requirements.
The communication circuit 50 may remotely transmit data under test. The communication circuit 50 may adopt a wireless communication module, such as WIFI, ZigBee, or the like. The transmission of experimental data through the communication circuit 50 is beneficial to real-time processing of relevant data and quickening the completion of theoretical analysis.
The voltage sag generator 100 converts an ac voltage into a dc voltage through the three-phase rectification circuit 10, and in combination with the dc bus capacitor 20, can provide a stable dc power supply for the inverter 30. By controlling the inverter 30 through the dual digital signal control circuit 40, accurate division of the control process can be achieved, thereby improving the control accuracy and the operating efficiency of the voltage generator 100. In addition, the dual digital signal control circuit 40 can integrate multiple functions, which improves the intelligence of the voltage sag generator 100. The communication circuit 50 can complete the real-time data transmission of the voltage temporary generator 100 during the use process, which is beneficial to the data analysis process. In summary, the voltage sag generator 100 has the advantages of full digitalization, high precision, high power, low cost and remote communication based on the dual digital signal control circuit 40.
Referring to fig. 2-3 together, in one embodiment, the dual-digital-signal control circuit 40 includes a first digital-signal control branch 410 and a second digital-signal control branch 420. The first digital signal control branch 410 is electrically connected to the inverter 30, and is configured to generate a sag voltage and drive the inverter 30. The second digital signal control branch 420 is electrically connected to the first digital signal control branch 410 and the communication circuit 50, respectively, and is configured to receive the operation status data of the first digital signal control branch 410 and perform data exchange with the communication circuit 50. In one embodiment, the dual digital signal control circuit 40 also includes a dual port dynamic memory 430. The dual-port dynamic memory 430 is electrically connected to the first digital signal control branch 410 and the second digital signal control branch 420 respectively, and is located between the first digital signal control branch 410 and the second digital signal control branch 420. The first digital signal control branch 410 and the second digital signal control branch 420 exchange data through the dual-port dynamic memory 430.
the dual digital signal control circuit 40 is the core control circuit of the voltage sag generator 100. The dual Digital Signal control circuit 40 is implemented by a dual Digital Signal Processor (DSP) architecture. One of the DSPs (named DSPA) is responsible for part of the control programs for completing the functions of data acquisition, remote communication, man-machine interaction, starting and stopping of the equipment, protection control, inputting of the sag function parameters, displaying of the running state and the like. The DSPA control equipment is started and stopped, namely the power grid is controlled to be connected or disconnected, and meanwhile the DSPA is controlled to start running a functional program. If the DSPA finds that the device is damaged by overcurrent, overvoltage, over-temperature and the like during the operation of the device, the DSPA can operate a relevant program for controlling the device to stop, and block the PWM output, thereby realizing the protection control of the voltage sag generator 100.
another DSP (named DSPB) is responsible for the core control program for accomplishing the generation and control of the sag voltage, the generation of the IGBT drive signal of the inverter 30, and the like. It can be understood that the generation and control of the sag voltage are to generate a voltage command by using a trigonometric function, and generate a corresponding control command by combining an algorithm program. The generation of the IGBT driving signal of the inverter 30 means converting the control command into a PWM cycle number according to the PWM module operating characteristics of the DSP.
The DSPA and the DSPB are clearly assigned, and the dual port dynamic memory 430, i.e., the dual port RAM, is used as an intermediate medium for data exchange, so that the control accuracy and the operating efficiency of the voltage sag generator 100 are obviously improved, and the expansibility of the voltage sag generator 100 is enhanced. Therefore, the voltage sag generator 100 can integrate more functions, and further meet the requirement of multi-functional intelligence. In one embodiment, the DSP chip employed by the dual digital signal control circuit 40 may be a model TI TMS320F28335 chip. The dual-port RAM adopts static RAM with the model number of IDT7133LA 70J.
in one embodiment, the voltage sag generator 100 further comprises a sampling circuit 60. The sampling circuit 60 is electrically connected to the inverter 30, the first digital signal control branch 410 and the second digital signal control branch 420, respectively. The sampling circuit 60 is configured to collect three-phase currents and voltages output by the inverter 30 and transmit the three-phase currents and voltages to the second digital signal control branch 420 after receiving a first digital signal control command sent by the first digital signal control branch 410. The sampling circuit 60 further comprises a fault detection circuit, which can realize real-time monitoring of voltage and current.
In one embodiment, the sampling circuit 60 includes a current sensor 610 and a voltage sensor 620. The current sensor 610 is electrically connected to the inverter 30. The voltage sensor 620 is electrically connected to the inverter 30. The sampler 630 is electrically connected to the first digital signal control branch 410, the second digital signal control branch 420, the current sensor 610 and the voltage sensor 620, respectively. The sampler 630 is configured to collect current data of the current sensor 610 and voltage data of the voltage sensor 620 after receiving a first digital signal control instruction sent by the first digital signal control branch 410, and transmit the current data and the voltage data to the second digital signal control branch 420. It is understood that the current sensor 610 and the voltage sensor 620 are used for sampling the output three-phase voltage and current. The result of the sampling can be transmitted to the DSPA and control, display or data can be transmitted to a control terminal through the communication circuit 50 as required. In one embodiment, the sampler 630 is an A/D sampler. The digital-to-analog conversion chip of the A/D sampler can adopt an ADS8364 chip of AD company.
In one embodiment, a touch display screen 70 is further included, electrically connected to the second digital signal control branch 420, for displaying data and inputting commands. The man-machine interaction process of the voltage sag generator 100 can be completed through the touch display screen 70. It is understood that the touch display screen 70 may be a UI touch screen. The touch display screen 70 is used for inputting voltage sag parameters and displaying voltage and current data. Specifically, the worker may input the sag amplitude, the sag start phase, and the sag duration of the voltage through the touch display screen 70. Meanwhile, the touch display screen 70 can display information such as output voltage and current, fault state, operation mode and the like of the system in real time. The touch system of the touch display screen 70 has a friendly interface and is easy and convenient to operate. The staff can set the relevant parameters of the output voltage and obtain the current running state parameters of the system through the touch display screen 70, and the method has the advantages of convenience in operation, simplicity and intuition. In one embodiment, the touch screen display 70 may be implemented as a 7-inch industrial human machine interface touch screen model ET070, manufactured by Takeuke corporation.
In one embodiment, a filter circuit 80 is further included, electrically connected to the inverter 30, for filtering the output voltage and current of the inverter 30. In one embodiment, the filter circuit 80 is an LC filter circuit. The LC filter circuit is a passive filter circuit and consists of an inductor and a capacitor, can filter one or more times of harmonic waves, and has the advantage of good stability.
In one embodiment, a first circuit breaker 910 is further included, electrically connected to the filter circuit 80, for controlling whether the output of the inverter 30 is connected to a load. In one embodiment, a second breaker 920 is further included, electrically connected to the three-phase rectification circuit 10, for connecting the three-phase rectification circuit 10 to a power grid.
the voltage sag generator 100 can accurately generate voltage waveforms of three-phase simultaneous sag (rise) or only one-phase sag (rise) with adjustable sag (rise) amplitude, sag (rise) starting phase and sag (rise) duration. The voltage sag generator 100 operates according to the following principle: firstly, a starting instruction is input through the touch display screen 70 to charge the direct current bus capacitor 20 on the direct current side. After the charging is completed, the sag parameters are input through the touch display screen 70. The dual digital signal control circuit 40 generates a reference voltage according to the instruction, and samples the voltage and current in real time through the sampling circuit 60. The PWM signal outputted from the dual digital signal control circuit 40 is amplified by the driving circuit and then applied to the IGBT of the inverter 30, so as to generate a stable specified voltage waveform. Specifically, the DSPA first converts the physical quantity into corresponding sampling data through the a \ D logic, and integrates and processes the instruction transmitted from the touch display screen 70. And then transmitting each data to the DSPB through the dual-port RAM. And the DSPB performs control program calculation according to the obtained data, calculates a control command and assigns the control command to the PWM module, and controls the inverter 30.
In summary, the main part of the voltage sag generator 100 includes the first circuit breaker 910, the three-phase rectification circuit 10, the dc bus capacitor 20, the inverter 30, the dual digital signal control circuit 40, the communication circuit 50, the sampling circuit 60, the filter circuit 80, and the second circuit breaker 920. In addition, the voltage sag generator 100 further includes peripheral circuits such as a signal conditioning and analog-to-digital conversion circuit, a fault detection circuit, and a driving circuit, and the signal conditioning and analog-to-digital conversion circuit can be used for remote communication. The fault detection circuit is used to detect current and voltage during sampling by the sampling circuit 60. The driving circuit involves a plurality of hardware circuits for driving of the respective hardware circuits. The voltage sag generator 100 has a compact structure, and has the advantages of miniaturization, convenience and the like.
Referring to fig. 4, the present application provides a voltage sag generating system 200. The voltage sag generation system 200 includes a voltage sag generator 100 and a remote terminal 210. The voltage sag generator 100 includes a three-phase rectification circuit 10, a dc bus capacitor 20, an inverter 30, a dual digital signal control circuit 40, and a communication circuit 50. The three-phase rectifier circuit 10 is used to convert an ac voltage into a dc voltage. The direct current bus capacitor 20 is connected in parallel with the three-phase rectification circuit 10 and used for storing electric energy. The inverter 30 is electrically connected to the three-phase rectification circuit 10 in a back-to-back manner, and outputs a three-phase ac voltage required by a load. The dual digital signal control circuit 40 is electrically connected to the inverter 30, and is configured to generate a sag voltage and drive the inverter 30. The communication circuit 50 is electrically connected to the dual digital signal control circuit 40 for data transmission. The remote terminal 210 is communicatively coupled to the communication circuit 50.
specifically, referring to fig. 1 to fig. 3, the three-phase rectification circuit 10, the dc bus capacitor 20, the inverter 30, the dual digital signal control circuit 40, the communication circuit 50, and the remote terminal 210 may be any one of the three-phase rectification circuit 10, the dc bus capacitor 20, the inverter 30, the dual digital signal control circuit 40, the communication circuit 50, and the remote terminal 210 in the above embodiments, and are not described herein again.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
the above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (15)
1. A voltage sag generator (100), comprising:
a three-phase rectifier circuit (10) for converting an alternating voltage into a direct voltage;
The direct current bus capacitor (20) is connected with the three-phase rectifying circuit (10) in parallel and is used for storing electric energy;
An inverter (30) electrically connected to the three-phase rectifier circuit (10) in a back-to-back manner, for outputting a three-phase alternating voltage required by a load;
A dual digital signal control circuit (40) electrically connected to the inverter (30) for generating a sag voltage and driving the inverter (30); and
And the communication circuit (50) is electrically connected with the double-digital-signal control circuit (40) and is used for transmitting data.
2. the voltage sag generator (100) according to claim 1, wherein the dual digital signal control circuit (40) comprises:
A first digital signal control branch (410) electrically connected with the inverter (30) and used for generating a temporary reduction voltage and driving the inverter (30); and
And the second digital signal control branch (420) is respectively electrically connected with the first digital signal control branch (410) and the communication circuit (50) and is used for receiving the operation state data of the first digital signal control branch (410) and exchanging data with the communication circuit (50).
3. The voltage sag generator (100) according to claim 2, wherein the dual digital signal control circuit (40) further comprises a dual port dynamic memory (430) electrically connected to the first digital signal control branch (410) and the second digital signal control branch (420), respectively, and located between the first digital signal control branch (410) and the second digital signal control branch (420), and the first digital signal control branch (410) and the second digital signal control branch (420) exchange data via the dual port dynamic memory (430).
4. The voltage sag generator (100) according to claim 2, further comprising a sampling circuit (60) electrically connected to the inverter (30), the first digital signal control branch (410), and the second digital signal control branch (420), respectively, for collecting three-phase current and voltage outputted by the inverter (30) and transmitting the three-phase current and voltage to the second digital signal control branch (420) after receiving a first digital signal control command sent by the first digital signal control branch (410).
5. The voltage sag generator (100) according to claim 4, wherein the sampling circuit (60) comprises:
A current sensor (610) electrically connected to the inverter (30);
A voltage sensor (620) electrically connected to the inverter (30); and
The sampler (630) is electrically connected with the first digital signal control branch (410), the second digital signal control branch (420), the current sensor (610) and the voltage sensor (620), and is used for collecting current data of the current sensor (610) and voltage data of the voltage sensor (620) after receiving a first digital signal control command sent by the first digital signal control branch (410), and transmitting the current data and the voltage data to the second digital signal control branch (420).
6. The voltage sag generator (100) according to claim 5, wherein the sampler (630) is an A/D sampler.
7. the voltage sag generator (100) according to claim 2, further comprising a touch display screen (70) electrically connected to the second digital signal control branch (420) for displaying data and command inputs.
8. The voltage sag generator (100) according to claim 1, further comprising a filtering circuit (80) electrically connected to the inverter (30) for filtering the output voltage and current of the inverter (30).
9. The voltage sag generator (100) according to claim 8, wherein the filter circuit (80) is an LC filter circuit.
10. The voltage sag generator (100) according to claim 8, further comprising a first circuit breaker (910), electrically connected to the filter circuit (80), for controlling whether the output of the inverter (30) is connected to a load.
11. A voltage sag generator (100) according to claim 1, further comprising a second circuit breaker (920) electrically connected to the three-phase rectification circuit (10) for connecting the three-phase rectification circuit (10) to a power grid.
12. voltage sag generator (100) according to claim 1, wherein the three-phase rectification circuit (10) is a three-phase uncontrolled rectifier bridge.
13. The voltage sag generator (100) according to claim 1, wherein the inverter (30) is a two-level voltage source inverter.
14. The voltage sag generator (100) according to claim 1, wherein the inverter (30) comprises an insulated gate bipolar transistor.
15. A voltage sag generation system (200), comprising:
A voltage sag generator (100), the voltage sag generator (100) comprising:
A three-phase rectifier circuit (10) for converting an alternating voltage into a direct voltage;
The direct current bus capacitor (20) is connected with the three-phase rectifying circuit (10) in parallel and is used for storing electric energy;
An inverter (30) electrically connected to the three-phase rectifier circuit (10) in a back-to-back manner, for outputting a three-phase alternating voltage required by a load;
a dual digital signal control circuit (40) electrically connected to the inverter (30) for generating a sag voltage and driving the inverter (30); and
The communication circuit (50) is electrically connected with the double-digital-signal control circuit (40) and is used for transmitting data; and
A remote terminal (210) communicatively coupled to the communication circuit (50).
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| CN111060726A (en) * | 2019-12-30 | 2020-04-24 | 国网陕西省电力公司电力科学研究院 | Voltage sag generation method and device |
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2019
- 2019-02-27 CN CN201920247863.7U patent/CN209767395U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111060726A (en) * | 2019-12-30 | 2020-04-24 | 国网陕西省电力公司电力科学研究院 | Voltage sag generation method and device |
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