CN110011308B - Modular power grid background harmonic simulation device and control method thereof - Google Patents
Modular power grid background harmonic simulation device and control method thereof Download PDFInfo
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- CN110011308B CN110011308B CN201910335255.6A CN201910335255A CN110011308B CN 110011308 B CN110011308 B CN 110011308B CN 201910335255 A CN201910335255 A CN 201910335255A CN 110011308 B CN110011308 B CN 110011308B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00019—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using optical means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a modularized power grid background harmonic simulation device and a control method thereof, wherein the modularized power grid background harmonic simulation device comprises the following steps: the device comprises a main control unit, a full-control rectifying unit, a harmonic voltage generating unit and an upper computer; the main control unit is respectively connected with the full-control rectifying unit, the harmonic voltage generating unit and the upper computer; the alternating current input end is sequentially connected with the fully-controlled rectifying unit and the harmonic voltage generating unit in series; the main control unit receives power grid background harmonic voltage data parameter information sent by the upper computer, sends a control instruction according to the received information and controls the harmonic voltage generation unit to generate corresponding background harmonic voltage; the harmonic voltage generation unit outputs a measured Hall voltage sampling signal to the main control unit, and the main control unit adjusts the control instruction according to the received feedback signal. The invention is used for simulating the local power grid background harmonic voltage and providing high-precision and intelligent power grid background harmonic voltage for the dynamic detection of the detected equipment.
Description
Technical Field
The invention relates to the technical field of power grid background characteristic simulation, in particular to a modularized power grid background harmonic simulation device and a control method thereof.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Along with the development of the power technology, the requirements on the performance and the reliability of the electrical equipment are higher and higher, and corresponding standard requirements are provided for the tolerance degree of the electrical equipment capable of bearing the background power quality condition; the power grid background harmonic voltage is an important characteristic parameter in a power grid and is directly related to economic and technical problems of harmonic bearing capacity of equipment, harmonic tolerance of the equipment and the like.
Under normal conditions, the power grid provides three-phase symmetrical sinusoidal voltage sources, so that various faults of the power grid are not common. Therefore, when the testing equipment is connected to the grid, a device capable of simulating various faults of the power grid is needed.
The inventor finds that in a conventional voltage fluctuation and high-low voltage test, the voltage amplitude change of the test equipment can be simulated by adopting the voltage regulating device, the voltage fluctuation range of a power grid is simulated by regulating the voltage amplitude of the output side, but the content of the background harmonic wave of the power supply voltage cannot be simulated.
When various electric energy quality devices are dynamically detected, actual power grid background voltage harmonic waves need to be simulated; although the conventional power grid simulation device can simulate specific background harmonic waves of a power grid by controlling the frequency and the phase of output voltage, the topological structure of the device usually adopts a high-power electronic device, so that the control precision is low, and the problems of high equipment failure rate, large volume, poor flexibility and the like exist.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a modularized power grid background harmonic simulation device and a control method thereof, which can simulate local power grid background harmonic voltage, provide high-precision and intelligent power grid background harmonic voltage for dynamic detection of power quality equipment, and meet the test requirements of different equipment.
In some embodiments, the following technical scheme is adopted:
a modular power grid background harmonic simulation apparatus, comprising: the device comprises a main control unit, a full-control rectifying unit, a harmonic voltage generating unit and an upper computer; the main control unit is respectively connected with the full-control rectifying unit, the harmonic voltage generating unit and the upper computer; the alternating current input end is sequentially connected with the fully-controlled rectifying unit and the harmonic voltage generating unit in series;
the main control unit receives power grid background harmonic voltage data parameter information sent by the upper computer, sends a control instruction according to the received information and controls the harmonic voltage generation unit to generate corresponding background harmonic voltage; the harmonic voltage generation unit outputs a measured Hall voltage sampling signal to the main control unit, and the main control unit adjusts the control instruction according to the received feedback signal.
Further, the upper computer is connected with the remote monitoring platform, the power grid background harmonic voltage data parameter information is sent to the upper computer through the remote monitoring platform, and the upper computer sends the received information to the main control unit; or the remote monitoring platform directly sends the power grid background harmonic voltage data parameter information to the main control unit.
Furthermore, the fully-controlled rectifying unit comprises a plurality of fully-controlled rectifying subunits connected in parallel, the harmonic voltage generating unit comprises a plurality of harmonic voltage generating subunits, each fully-controlled rectifying subunit is connected with one harmonic voltage generating subunit to form a power grid background harmonic simulation module, and the output ends of all the power grid background harmonic simulation modules are connected in parallel through branch breakers and are connected to the input ends of different testing devices.
Further, the main control unit controls the output of each power grid background harmonic simulation module according to the capacity of the test equipment.
Furthermore, the main control unit is in bidirectional communication with each power grid background harmonic simulation module, when a single power grid background harmonic simulation module breaks down, the power grid background harmonic simulation module automatically quits operation, and the rest power grid background harmonic simulation modules automatically equally divide and output according to load capacity.
Furthermore, the full-control rectification unit and the harmonic voltage generation unit adopt a two-stage conversion architecture modular structure of isolated PWM rectification and PWM inversion, and the capacity of the device is enlarged by expanding the cascade number of the power modules.
Furthermore, each fully-controlled rectifier subunit is connected with an alternating current input end through a circuit breaker; the input end of the full-control rectifier subunit is connected with an RC high-frequency absorption device in parallel, then is connected with a buffer resistor and an input reactor in series in sequence and then is connected with an active rectification feedback converter, and the active rectification feedback converter converts alternating-current voltage into controllable direct-current voltage; and the output end of the active rectification feedback current transformer is connected with the harmonic voltage generation unit.
Furthermore, the output end direct current buses of each fully-controlled rectifier subunit are mutually independent; the voltage of the direct current bus is maintained by the energy storage capacitors supported by the direct current bus, and the two energy storage capacitors are connected in series and then connected to two ends of the direct current bus.
Furthermore, the input end of each harmonic voltage generation subunit is connected with two energy storage capacitors connected in series, and the energy storage capacitors are connected in series and then connected to two ends of a direct current bus; and then the direct current bus is connected into an analog inverter, and the output end of the analog inverter is connected with an RC high-frequency absorption device in parallel after being sequentially connected with a reactor and a buffer resistor in series.
In other embodiments, the following technical scheme is adopted:
a control method of a modular power grid background harmonic simulation device comprises the following steps:
the main control unit generates a background harmonic voltage control instruction according to the received parameter information for setting the background harmonic voltage data of the power grid, and sends the background harmonic voltage control instruction to the harmonic voltage generation unit; the harmonic voltage generating unit generates corresponding background harmonic voltage according to the received control command;
and the command control unit receives the output signal fed back by the harmonic voltage generation unit, compares the output signal with the set power grid background harmonic voltage data parameter information, and adjusts the background harmonic voltage control command according to the difference value of the output signal and the set power grid background harmonic voltage data parameter information.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention is used for simulating the local power grid background harmonic voltage and providing high-precision and intelligent power grid background harmonic voltage for the dynamic detection of the detected equipment.
2) A plurality of power grid background harmonic simulation modules are in parallel redundancy design, and the rated capacity can reach megawatt level. The output of each module is reasonably controlled according to the capacity of the detection equipment, the output capacity is adjustable on line, the detection accuracy is improved, and the error between the actual output and the set output is less than or equal to 1 percent; the failure of the unit module does not affect the operation of the system.
3) The output of the harmonic voltage generation unit is regulated in a closed-loop feedback mode, so that the input parameters of the harmonic voltage generation unit can be accurately corrected, the working voltage of a direct-current bus is actively regulated, and the harmonic content and the harmonic characteristic times of the output voltage are set, monitored and controlled by protection parameters.
4) The harmonic range can be adjusted respectively by digital control and setting parameters through an upper computer, and 0-51 times of arbitrary harmonic waves (including common harmonic waves and atypical harmonic waves in a laboratory) can be programmed.
5) By adopting a two-stage conversion architecture of isolated PWM rectification and PWM inversion, the output is isolated from the power grid, the influence of high-frequency injection on the power grid is prevented, and harmonic pollution to the power grid is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a schematic structural diagram of a modular power grid background harmonic simulation apparatus according to a first embodiment;
fig. 2 is a schematic circuit diagram of a modular power grid background harmonic simulation apparatus according to a first embodiment;
FIG. 3 is a flow chart of a voltage amplitude and frequency control method according to a first embodiment;
FIG. 4 is a programming interface for displaying the harmonic wave of the power grid background according to the first embodiment;
FIG. 5 is a waveform of a preview of the background harmonic voltage of the programmable grid according to the first embodiment;
FIG. 6 is a waveform of an output grid background harmonic voltage in accordance with the first embodiment;
FIG. 7 is a typical 20% voltage distortion rate waveform for programmable three phases in the first embodiment;
fig. 8 shows waveforms of parallel redundant output of power cells according to the first embodiment.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
In one or more embodiments, a modular power grid background harmonic simulation device is provided, as shown in fig. 1, and includes a main control unit, a full-control rectification unit, a harmonic voltage generation unit, an upper computer, and an auxiliary power supply unit.
The main control unit is connected with the upper computer, the upper computer can be connected with the remote monitoring platform, and the main control unit receives data parameters of power grid background harmonic voltage waveforms required by experiments and sent by the upper computer or the remote monitoring platform. The upper computer and the remote monitoring platform can be switched to work; the upper computer can directly issue commands; the remote monitoring platform can also issue commands to the upper computer, and the upper computer issues commands to the main control unit.
The main control unit is connected with the full-control rectifying unit and the harmonic voltage generating unit and is communicated with the full-control rectifying unit and the harmonic voltage generating unit through optical fibers.
The controller of the full-control rectification unit is connected with the main control unit through optical fibers, the main control unit controls the working state of each full-control rectification unit, the working voltage of the direct-current bus is regulated and stabilized, the working state of the rectification units is monitored in real time, and the input side adopts an SPWM rectification mode to reduce pollution of harmonic waves to a power grid.
The main control unit controls the harmonic voltage generation unit through the optical fiber, command voltage operation in the digital processor of the main control unit forms command signals and sends the command signals to the harmonic voltage generation unit controllers, and the harmonic voltage generation unit controllers generate driving commands through calculation according to the command signals sent by the main controller to control the harmonic voltage generation unit to generate required harmonic voltage. The output side feeds back to the main control unit through the Hall voltage sampling signal to form closed-loop feedback, and the main control unit transmits a signal to an upper computer or a remote monitoring platform, and fine adjustment is carried out according to a set parameter and an actual output parameter difference value to guarantee the requirement of output precision. The number of voltage harmonics generated by the main control unit is 0-51, low-frequency harmonics and inter-harmonics can be added at will, and the harmonic content is in any proportion from 0% to 100%.
As shown in fig. 2, the full-control rectification unit and the harmonic voltage generation unit adopt a two-stage conversion architecture modular structure of isolated PWM rectification and PWM inversion, and the device capacity is enlarged by expanding the number of cascade of power modules.
The PWM rectification output side and the PWM inversion input side are connected through direct current voltage, the input of the whole device is three-phase alternating current voltage, the output of the whole device is three-phase alternating current voltage, when the device outputs analog any background harmonic voltage, the voltage waveform of the input side cannot be influenced because the input and the output are separated through direct current, and the rectification side and the inversion are both designed by adopting a modular structure. Therefore, the structure is an isolated two-stage transformation framework modular structure.
Different power capacities of the modularized power grid background harmonic simulation device are formed by connecting different groups of power units in parallel, for example: the 100kVA device is composed of 1 group of isolated PWM rectification and PWM inversion two-stage transformation framework modules, the 300kVA device is composed of 3 groups of isolated PWM rectification and PWM inversion two-stage transformation framework modules, capacity increase is realized through parallel modules, direct current buses of each group are independent, and the groups are not influenced by each other; the capacity allocation is controlled by the master control unit.
The full-control rectification unit comprises a plurality of full-control rectification subunits connected in parallel, the harmonic voltage generation unit comprises a plurality of harmonic voltage generation subunits, each full-control rectification subunit is connected with one harmonic voltage generation subunit to form a power grid background harmonic simulation module, and the output ends of all the power grid background harmonic simulation modules are connected in parallel through branch circuit breakers and connected to the input ends of different test equipment.
And the main control unit controls the output of each power grid background harmonic simulation module according to the capacity of the test equipment. The main control unit is in bidirectional communication with each power grid background harmonic simulation module, when a single power grid background harmonic simulation module breaks down, the power grid background harmonic simulation module automatically quits operation, and the rest power grid background harmonic simulation modules automatically equally divide output according to load capacity.
The power grid background harmonic simulation module runs in a multi-module parallel mode, and according to the size of the capacity of equipment to be detected in the test, the upper computer or the remote monitoring platform sends an instruction, and the main control unit gives an actual action signal to control each group of harmonic voltage generation units to output, so that different capacity requirements are met. And an independent auxiliary power supply system is adopted to provide a reliable power supply for the main control unit and the upper computer.
Referring to fig. 2, the input side of the device is connected with a power grid through a breaker, and then a fully-controlled rectifying unit and a harmonic voltage generating unit output the breaker are sequentially arranged. The input end of the full-control rectification unit is connected with an RC high-frequency absorption device in parallel and is connected with an input reactor through a buffer resistor, so that the impact of on-off on the device and equipment caused by the on-off of a contactor under load is avoided; the output end is connected with an active rectification feedback converter, the active rectification feedback converter converts alternating current voltage into controllable direct current voltage, and a three-phase alternating current contactor controls the on-off of a circuit at the front end of the active rectification feedback converter; the output of the active rectification feedback converter is connected with an analog inverter of the harmonic voltage generation unit, the voltage of a direct current bus is maintained by an energy storage capacitor supported by the direct current bus, the two capacitors supported by the direct current bus are connected in series, the middle point of the series connection is the central line N of each group of analog inverters, and the positive and negative of the direct current bus are connected with the direct current input of the analog inverter assembly; the direct current buses of the power grid background harmonic simulation modules are independent of each other, the main control unit respectively controls the working voltage of the direct current buses, and the simulation inverter outputs an independent RC high-frequency filtering absorption circuit. The output ends of the power grid background harmonic simulation modules are connected in parallel through branch breakers and are connected to the input ends of different detection devices, the power grid background state is simulated, the local power grid simulation environment is realized, and the detection devices are tested.
The harmonic voltage generation unit outputs a voltage Hall detection signal and an output current transformer detection signal which are fed back to the input end of an instruction voltage operation unit in the main control unit, input parameters of the harmonic voltage generation unit are accurately corrected, the working voltage of a direct current bus is actively adjusted, the harmonic content and the harmonic characteristic times of the output voltage are set and monitored and controlled by protection parameters, instruction signals of the main control unit are transmitted to each harmonic voltage generation unit through optical fibers, issued instructions generate driving signals through a controller of the harmonic voltage generation unit to control a simulation inverter switch, and required background harmonic voltage is generated.
Waveform can be defined by an upper computer, any power grid background harmonic voltage to be simulated is edited, data initialization is carried out on three-phase voltage, fundamental waves are programmed according to the tested voltage amplitude, phase and reference frequency, and then required characteristic subharmonics are programmed. Waveform preview can be carried out on an upper computer, and the main control unit carries out operation according to an instruction sent by the upper computer to obtain an SPWM voltage pulse width signal to drive the IGBT to generate a set power grid background harmonic voltage.
Example two
In one or more embodiments, a control method of a modular power grid background harmonic simulation device is provided, which includes the following steps:
(1) the power grid voltage sequentially passes through the input circuit breaker and the full-control rectifying unit, and the full-control rectifying unit converts the alternating voltage into controllable direct voltage which is connected with the direct current side of the harmonic voltage generating unit;
(2) the main control unit is connected with essential parameters such as harmonic characteristic order and harmonic content of the power grid background harmonic wave required by the experiment and transmitted by the upper computer or the remote monitoring platform;
(3) the digital processor in the main control unit calculates and forms command signals according to the command voltages and sends the command signals to the harmonic voltage generation unit controllers, the harmonic voltage generation unit controllers generate driving commands through calculation according to the command signals sent by the main control unit to control the harmonic voltage generation units to generate required harmonic voltages, and synchronous signals are generated through data processing and used for driving the harmonic voltage generation units to generate background harmonic voltage waveforms;
(4) the voltage Hall detection signal of the output side of the harmonic voltage generation unit and the detection signal of the output current transformer are fed back to the input end of the command voltage operation unit in the main control unit, the input parameters of the harmonic voltage generation unit are accurately corrected, the working voltage of the direct current bus, the characteristic order of the background harmonic voltage and the distortion rate are actively adjusted, and the setting and monitoring of protection parameters are realized.
For any power grid background harmonic voltage source, various voltage sources with different requirements can be generated by controlling the amplitude and the phase of the voltage. The voltage converted by analog-to-digital conversion is composed of a fundamental voltage and each harmonic voltage.
The actual waveform is analyzed by fast fourier transform FFT,
the harmonic voltage with the reference frequency as a base number and integral multiple of the reference frequency can be decomposed into the highest harmonic voltage with the number of n times.
In the formula, ω1The angular frequency is the reference frequency, and the unit is rad/s; h is the harmonic frequency; u. ofhIs the root mean square value of the h-th harmonic voltage with the unit of A, βhThe phase angle of the h-th harmonic voltage is given by rad; and n is the highest number of considered harmonic waves and is determined according to the highest number of the power grid background harmonic voltage sources required by the test.
Decompose the data into Uxa0, Uya0, Uxal, uya1.... uean, Uyan; uxb0, Uyb0, Uxb1, uyb1.... ukbn, Uybn; uxc0, Uyc0, Uxc1, Uycn 1.... Uycn; and (4) carrying out amplitude normalization and summarization on the amplitude and the phase of each subharmonic frequency, amplitude and phase. Set by the modulus Ran and the phase angle α, it needs to be converted into Ux and Uy of a rectangular coordinate system. By the following calculation formula:
phase A:
phase B:
and C phase:
TABLE 1 comparison table of polar coordinate and rectangular coordinate of background harmonic voltage
Splitting sine waves with different frequencies into superposition according to N times of reference frequency (N is a positive integer), changing the amplitude and the phase of each split harmonic voltage, normalizing the numerical value, and restoring N point data in one fundamental wave period, wherein N is a natural number greater than 0, and the larger N is, the more accurate the calculation result is, the more accurate the reference voltage, the amplitude value and the phase value of each harmonic voltage are respectively changed.
TABLE 2 subharmonic Programming Table of voltages
| Number of harmonics | Amplitude value | Angle of rotation | Arc degree | 0 | 1 | 2 | 3 | 4 | 5 | 6 | . | . | |
| 1 | |||||||||||||
| 2 | |||||||||||||
| . | |||||||||||||
| . | |||||||||||||
| 5 |
By adjusting the amplitude of each harmonic voltage and setting each harmonic phase angle, the requirements of background harmonic voltage distortion and characteristic order of different test requirements can be met.
As shown in fig. 3, the main control unit performs subtraction according to the effective value of the power grid background harmonic voltage set in the upper computer-human interface and the effective value of the voltage fed back by system sampling, and then generates an amplitude signal through PI adjustment; when the set output working frequency is consistent with the input working frequency, the output voltage is locked with the input voltage through a phase locker, a command and a set working frequency signal are sent to a sine wave generated in a positive wave selection table together, the actual waveform is split through the sine wave table, and U (t) is U multiplied by sin (2 pi f/n);
splitting the sine wave in one period by 2048 points according to a sine wave table; and the instruction signal generated by the sine wave meter and the amplitude signal generated by PI regulation are operated, the operation result is subtracted from the signal instantaneously fed back by voltage, then an amplitude signal is generated by PI regulation, and the amplitude signal is operated with a first preset proportionality coefficient K to obtain an SPWM voltage pulse width signal so as to drive the IGBT to generate the set power grid background harmonic voltage.
As shown in fig. 4, the upper computer can edit any power grid background harmonic voltage to be simulated by customizing a waveform, perform data initialization on the three-phase voltage, program the fundamental wave according to the tested voltage amplitude, phase and reference frequency, then program the required characteristic subharmonic, and perform amplitude normalization by the control method of the programmable power grid background harmonic simulation device. As shown in fig. 5, the waveform preview can be performed on the upper computer, and the main control unit performs calculation according to an instruction issued by the upper computer to obtain an SPWM voltage pulse width signal to drive the IGBT to generate a set power grid background harmonic voltage, as shown in fig. 6, the output power grid background harmonic voltage waveform is shown, and fig. 7 is a three-phase typical 20% voltage distortion rate waveform.
The main control unit is in two-way communication with each harmonic generation unit, when a single module breaks down, the operation is automatically quitted, and the rest modules are automatically equally divided according to the load capacity, so that the test is not influenced. As shown in fig. 8, 1 is the output voltage, 2 is the single module output current, 3 is the total output current, and after the single module fault exits and is put into operation, there is no influence on 1 and 3.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (8)
1. A modular power grid background harmonic simulation apparatus, comprising: the device comprises a main control unit, a full-control rectifying unit, a harmonic voltage generating unit and an upper computer; the main control unit is respectively connected with the full-control rectifying unit, the harmonic voltage generating unit and the upper computer; the alternating current input end is sequentially connected with the fully-controlled rectifying unit and the harmonic voltage generating unit in series;
the main control unit receives power grid background harmonic voltage data parameter information sent by the upper computer, sends a control instruction according to the received information and controls the harmonic voltage generation unit to generate corresponding background harmonic voltage; the harmonic voltage generation unit outputs a Hall voltage sampling signal to be measured and feeds the Hall voltage sampling signal back to the main control unit, and the main control unit adjusts a control instruction according to the received feedback signal;
the full-control rectification unit comprises a plurality of full-control rectification subunits connected in parallel, the harmonic voltage generation unit comprises a plurality of harmonic voltage generation subunits, each full-control rectification subunit is connected with one harmonic voltage generation subunit to form a power grid background harmonic simulation module, and the output ends of all the power grid background harmonic simulation modules are connected in parallel through branch circuit breakers and are connected to the input ends of different test equipment;
the main control unit is in bidirectional communication with each power grid background harmonic simulation module, when a single power grid background harmonic simulation module breaks down, the power grid background harmonic simulation module automatically quits operation, and the rest power grid background harmonic simulation modules automatically equally divide output according to load capacity.
2. The modular power grid background harmonic simulation device according to claim 1, wherein the upper computer is connected with a remote monitoring platform, power grid background harmonic voltage data parameter information is sent to the upper computer through the remote monitoring platform, and the upper computer sends the received information to the main control unit; or the remote monitoring platform directly sends the power grid background harmonic voltage data parameter information to the main control unit.
3. The modular power grid background harmonic simulation apparatus of claim 1, wherein the master control unit controls the output of each power grid background harmonic simulation module according to the capacity of the test device.
4. The modular power grid background harmonic simulation device according to claim 1, wherein the fully-controlled rectification unit and the harmonic voltage generation unit adopt a two-stage transformation architecture modular structure of isolated PWM rectification and PWM inversion, and the device capacity is enlarged by expanding the number of cascaded power modules.
5. A modular grid background harmonic simulation apparatus as claimed in claim 1 wherein each of said fully controlled rectifier sub-units is connected to an ac input through a circuit breaker; the input end of the full-control rectifier subunit is connected with an RC high-frequency absorption device in parallel, then is connected with a buffer resistor and an input reactor in series in sequence and then is connected with an active rectification feedback converter, and the active rectification feedback converter converts alternating-current voltage into controllable direct-current voltage; and the output end of the active rectification feedback current transformer is connected with the harmonic voltage generation unit.
6. The modular power grid background harmonic simulation apparatus as claimed in claim 5 wherein the output dc busses of each of the fully controlled rectifier sub-units are independent of each other; the voltage of the direct current bus is maintained by the energy storage capacitors supported by the direct current bus, and the two energy storage capacitors are connected in series and then connected to two ends of the direct current bus.
7. The modular power grid background harmonic simulation device as claimed in claim 5, wherein each harmonic voltage generation subunit input end is connected with two energy storage capacitors connected in series, and the energy storage capacitors are connected in series and then connected to two ends of a direct current bus; and then the direct current bus is connected into an analog inverter, and the output end of the analog inverter is connected with an RC high-frequency absorption device in parallel after being sequentially connected with a reactor and a buffer resistor in series.
8. A control method of a modular power grid background harmonic simulation device, which adopts the modular power grid background harmonic simulation device as claimed in any one of claims 1 to 7, and comprises:
the main control unit generates a background harmonic voltage control instruction according to the received parameter information for setting the background harmonic voltage data of the power grid, and sends the background harmonic voltage control instruction to the harmonic voltage generation unit; the harmonic voltage generating unit generates corresponding background harmonic voltage according to the received control command;
and the command control unit receives the output signal fed back by the harmonic voltage generation unit, compares the output signal with the set power grid background harmonic voltage data parameter information, and adjusts the background harmonic voltage control command according to the difference value of the output signal and the set power grid background harmonic voltage data parameter information.
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| CN102222912A (en) * | 2011-06-17 | 2011-10-19 | 东北大学 | Controllable harmonic generation device for test and control method thereof |
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| US4044310A (en) * | 1973-11-30 | 1977-08-23 | Ird Mechanalysis, Inc. | Circuitry for generating a sine wave and/or cosine wave from a pulse signal |
| CN101251562A (en) * | 2008-03-04 | 2008-08-27 | 东南大学 | Energy feeding type electrical energy mass perturbance generating device |
| CN101950982A (en) * | 2010-09-25 | 2011-01-19 | 合肥工业大学 | Multifunctional power grid simulator and control method thereof |
| CN102222912A (en) * | 2011-06-17 | 2011-10-19 | 东北大学 | Controllable harmonic generation device for test and control method thereof |
| JP2013055792A (en) * | 2011-09-02 | 2013-03-21 | Fuji Electric Co Ltd | Simulation method of permanent magnet type rotary electric machine, loss calculating method using it, simulation program, loss calculating program, simulation system, and loss calculating system |
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