CN108667000A - A kind of ferromagnetic resonance detection of large-sized photovoltaic power station and restraining device - Google Patents
A kind of ferromagnetic resonance detection of large-sized photovoltaic power station and restraining device Download PDFInfo
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- CN108667000A CN108667000A CN201810427924.8A CN201810427924A CN108667000A CN 108667000 A CN108667000 A CN 108667000A CN 201810427924 A CN201810427924 A CN 201810427924A CN 108667000 A CN108667000 A CN 108667000A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
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Abstract
A kind of ferromagnetic resonance detection of large-sized photovoltaic power station and restraining device, including electromagnetic potential transformer further include sampling voltage regulating module, data processing module, control system module and switching value output module；Sampling voltage regulating module, data processing module, control system module and switching value output module are sequentially connected；Damping resistance is connected at electromagnetic potential transformer open delta, switching value output module is also associated with fling-cut switch, and fling-cut switch is connect with damping resistance.The present invention analyzes distribution network voltage data, judges whether that resonance occurs by carrying out sampling conditioning to PT secondary sides voltage.If resonance occurs, by with ARM chip communications, the switch motion of output control signal driving contactor realizes that effective switching of damping resistance completes inhibition to ferromagnetic resonance, and resonance information is shown to LCD screen, preserves to SD card and is uploaded to host computer.With fast response time, at low cost, small power consumption and the advantages such as reliable for operation.
Description
Technical field
The present invention relates to a kind of detection of ferromagnetic resonance and restraining devices, are based particularly on DSP+ARM（Digital
Signal Processor Digital Signal Processing+Advanced RISC Machines）The large-sized photovoltaic power station of structure is ferromagnetic
Resonance detector and restraining device, the invention belong to new energy distributed power generation and technical field of electric power transmission.
Background technology
Currently, due to being limited by factors such as equipment manufacturing technology and operating costs, in 35kV isolated neutral distribution
In net system, still widely used traditional electromagnetic potential transformer on substation bus bar（PT）, for monitoring electrical equipment
State of insulation.When normal operation, three-phase voltage is in a basic balance, the displacement voltage very little of neutral point.But in certain handover operations
Or in electromagnetic energy transient state transfer process caused by breaking down, the non-linear exciter inductance of PT works to saturation state,
Induction reactance becomes smaller.If the magnetizing inductance of PT and the direct-to-ground capacitance parameter of system（Predominantly outlet line mutual-ground capacitor）Matching forms non-
When linear resonance circuit, ferromagnetic resonance phenomenon will occur, and then generate ferro-resonance over-voltage.Due to ferromagnetic resonance and system
Electric network composition, the method for operation and device characteristics relating to parameters, thus system is caused to will appear high frequency, fundamental frequency, Subharmonic Resonance
Or more low-frequency resonance.
In China's large-scale photovoltaic grid-connected system, supply line present the characteristics of be air insulation overhead transmission line quilt
The cable run of solid insulation is replaced.With the increasing of cable outlet circuit, the growth of fed distance, system direct-to-ground capacitance electricity
Stream is multiplied.If unbalanced earth fault capacitance current is more than in clear stipulaties 35kV power grids in China's electrical equipment design specification
10A needs to use neutral by arc extinction coil grounding mode.However, the photovoltaic plant method of operation is flexible, in circuit switching,
Often change the capacitance current of system, to influence the tuning manner of arc suppression coil, causing cannot effective arc extinguishing.
In the case where large-scale photovoltaic permeates background, the risk that resonance overvoltage occurs for power distribution network, mutual induction of voltage are not only exacerbated
Device high-voltage wire iron-melting fusing, the accident exploded or even directly burnt happen occasionally；And make the origin cause of formation even more complex of such accident.
Therefore, the research of large-sized photovoltaic power station ferromagnetic resonance detection and the development of harmonic elimination apparatus are for promoting power distribution network
Security and stability and power supply reliability, the self-healing ability for enhancing power grid have important theory value and practical engineering value.
Invention content
The technical problem to be solved in the present invention is to provide a kind of ferromagnetic resonance detection of large-sized photovoltaic power station and restraining device,
Damping resistance is accessed at PT open deltas to increase the damping of resonance to achieve the purpose that effectively inhibit ferromagnetic resonance.
It is as follows that the present invention solves the technical solution that above-mentioned technical problem is taken：A kind of large-sized photovoltaic power station ferromagnetic resonance
Detection and restraining device, including electromagnetic potential transformer, it is characterised in that：Further include sampling voltage regulating module, data processing mould
Block, control system module and switching value output module；Sampling voltage regulating module is connected to data processing module, and data processing module connects
It is connected to control system module, control system module is connected to switching value output module；At electromagnetic potential transformer open delta
It is connected with damping resistance, switching value output module is also associated with fling-cut switch, and fling-cut switch is connect with damping resistance.
Further, control system module is connected with LCD screen, SD card storage, and control system module is also through telecommunication
Connect host computer.
The major function of sampling voltage regulating module is will be from electromagnetic potential transformer（Abbreviation PT）The voltage of secondary side acquisition
Sampling conditioning is carried out, data processing module is converted into（Abbreviation DSP）Analog-to-digital conversion（Abbreviation ADC）The electricity that pin can receive
It is flat, since PT secondary sides consider that surplus is the bipolar voltage that maximum virtual value is 110V, and sample voltage regulating module output end company
The ADC pins of the DSP connect can only handle the electrode of 0~3.3V, it is therefore necessary to the electricity for first sampling PT secondary sides
Pressure is then sent through DSP processing within the scope of being converted to 0~3.3V.The link with isolation features is needed to ensure live letter simultaneously
It number is not interfere with each other with control system.
The major function of data processing module is to complete to carry out A/D conversions simultaneously to 0~3.3V DC simulation signals of input
Data processing is carried out to it, analyzes and determines whether ferromagnetic resonance occurs on this basis.
Control system module major function is the analysis result of acquisition data processing module, and according to analysis result to switch
It measures output module to send out control signal accordingly while showing analysis result by LCD screen, SD card stores and remotely leads to
Letter is uploaded to host computer.The core of control system module of the present invention selects S3C2440 as control chip.
The present invention is applied to the inhibition of large-sized photovoltaic power station ferromagnetic resonance, it to PT secondary sides voltage by carrying out sampling tune
Reason, and realize fast Fourier algorithm using DSP, distribution network voltage data are analyzed, judge whether that resonance occurs.If hair
Raw resonance, by with ARM chip communications, output control signal driving fling-cut switch action, to realize the effective of damping resistance
Switching completes the inhibition to ferromagnetic resonance, and resonance information is shown to LCD screen, preserves to SD card and is uploaded to upper
Machine.The present invention has fast response time, at low cost, small power consumption and the advantages such as reliable for operation, has a good application prospect.
The present invention is based on DSP and ARM microprocessor, using the efficient mathematical operation of DSP core and signal processing function,
The generation for rapidly judging ferromagnetic resonance will inhibit ferromagnetic resonance and LCD to show, SD card storage, remotely send relevant information
It is integrated in ARM chips to the function in host computer, using by integrated, the control energy of powerful DSP mathematical operational ability and ARM
The embedded solution that power is combined.
The present invention utilizes DFT（Discrete Fourier Transform）Twiddle factor W in algorithmN knWith symmetrical
Property and periodically detect the generation of ferromagnetic resonance, gradually synthesize the DFT of long sequence by the DFT of short sequence, that is, utilize many
Small change easy to implement brings the large-scale transformation of completion, to reduce operation times, to improve arithmetic speed.
Description of the drawings
Fig. 1 is the structure chart of large-sized photovoltaic power station ferromagnetic resonance detection and restraining device system.
Fig. 2 is the structure chart of present invention sampling voltage regulating module.
In figure：1-sampling voltage regulating module, 2-data processing modules, 3-control system modules, 4-output switch parameter moulds
Block, 5-power supply modules, 6-electromagnetic potential transformers, 7-fling-cut switches, 8-second level voltage followers, 9-integrated fortune
Put device, 10-DC power supplies, R1- sampling resistor, R2- divider resistance, R3- A resistance, R4- B resistance, R5- C resistance, R6—D
Resistance, R7- current-limiting resistance.
Specific implementation mode
It is as follows that the following further describes the present invention with reference to the drawings.As shown in Figure 1：A kind of large-sized photovoltaic power station ferromagnetic resonance
Detection and restraining device, including electromagnetic potential transformer 6, it is characterised in that：Further include sampling voltage regulating module 1, data processing
Module 2, control system module 3 and switching value output module 4；Sampling voltage regulating module 1 is connected to data processing module 2, at data
Reason module 2 is connected to control system module 3, and control system module 3 is connected to switching value output module 4；Electromagnetic potential mutual inductance
Damping resistance is connected at 6 open delta of device, switching value output module 4 is also associated with fling-cut switch 7, fling-cut switch 7 and damping
Resistance connects.
Control system module 3 is connected with LCD screen, SD card storage, and the also DM9000 network interface cards of control system module 3 connect ether
Net, Ethernet connect host computer.
The present apparatus further includes power supply module 5, power supply module 5 and sampling voltage regulating module 1, data processing module 2, control system
Module 3 and switching value output module 4 connect, and working power is provided for them.The present apparatus is using 24V contactors as fling-cut switch
To control input and excision of the damping resistance at voltage transformer triangular opening.
As shown in Figure 2：It includes first order sectional pressure element, second level voltage follower and third step voltage to sample voltage regulating module
Biasing element；First order sectional pressure element is by sampling resistor R1With divider resistance R2Composition, sampling resistor R1With divider resistance R2One
End is connect with electromagnetic voltage mutual inductor secondary side respectively, sampling resistor R1With divider resistance R2The other end be connected to the second level electricity
Press follower 8；Third stage voltage offset element is by A resistance R3, B resistance R4, C resistance R5, D resistance R6, DC power supply 10 with it is integrated
Transport and placing device 9 forms, A resistance R3With B resistance R4It is connect with 9 cathode of integrated operatinoal amplifier, A resistance R3The other end ground connection, B resistance
R4The other end connect with 9 output end of integrated operatinoal amplifier, C resistance R5It is connect with second level voltage follower 8, DC power supply 10 and D
Resistance R6Connection, C resistance R5And D resistance R6The other end connect with integrated operatinoal amplifier 9；The connection of 9 output end of integrated operatinoal amplifier is limited
Leakage resistance R7。
First order sectional pressure element major function is to carry out voltage sample to PT secondary sides and divided to it, ensures its output electricity
Press ranging from -1.5V~1.5V.Second level voltage follower, which primarily serves, isolates electric system on-site signal and device
Effect, the amplitude of synchronous signal do not change.Third stage voltage offset element major function is to export voltage follower
Bipolar voltage -1.5V~1.5V is converted into the electrode of 0~3V to be received by DSP.Last signal passes through
Current-limiting resistance R7The ADC input pins for being sent to DSP carry out further operation and processing.
The course of work of the present invention is about：Electromagnetic voltage mutual inductor secondary side export the bipolar voltage signal of 110V to
Voltage regulating module 1 is sampled, voltage signal is sampled by sampling voltage regulating module, is improved, is ultimately converted to the voltage letter of 0~3.3V
The ADC input pins number being sent in data processing module 2, carry out the analysis and processing of data, and analysis result is sent into control system
Module 3, control system module use commercially available S3C2440 as control chip, analysis result are shown by LCD screen, SD card
Storage, and the telecommunications such as Ethernet are transmitted to by DM9000 network interface cards and are uploaded to host computer, and send out corresponding control signal
To switching value output module 4.
When ferromagnetic resonance occurs, serious distortion can occur for the PT secondary sides voltage waveform sampled, may produce
Raw a large amount of frequency dividing and high-frequency harmonic.It is located at the PT secondary side electricity that the DFT algorithm softwares of data processing module 2 obtain sampling
Corrugating is analyzed, its signal spectrum is obtained, to calculate the value of total harmonic distortion factor THD using DSP.If THD high
In the normal value of setting then judge that ferromagnetic resonance has occurred, be exported by the universal input of ARM（Abbreviation GPIO）Mouth output control
Signal puts into the damping resistance short time at PT open deltas to eliminate resonance.
For the ease of the accurate sampling of Subharmonic Resonance, it is 2 to select each periodic sampling points Ns of DSP10=1024, M=10, from
And choose the A/D sample frequencys of DSPfFor 1024 × 5=5.12 kHz.
Claims (5)
1. a kind of large-sized photovoltaic power station ferromagnetic resonance detects and restraining device, including electromagnetic potential transformer, it is characterised in that：
It further include sampling voltage regulating module（1）, data processing module（2）, control system module（3）With switching value output module（4）；Sampling
Voltage regulating module（1）It is connected to data processing module（2）, data processing module（2）It is connected to control system module（3）, control system
System module（3）It is connected to switching value output module（4）；Electromagnetic potential transformer（6）Damping resistance is connected at open delta,
Switching value output module（4）It is also associated with fling-cut switch（7）, fling-cut switch（7）It is connect with damping resistance.
2. a kind of large-sized photovoltaic power station as described in claim 1 ferromagnetic resonance detection and restraining device, it is characterised in that：Sampling
Voltage regulating module includes first order sectional pressure element, second level voltage follower（8）With third stage voltage offset element；The first order divides
Element is by sampling resistor（R1）With divider resistance（R2）Composition, sampling resistor（R1）With divider resistance（R2）One end respectively with electricity
Magnetic voltage transformer secondary side connects, sampling resistor（R1）With divider resistance（R2）The other end be connected to second level voltage follow
Device（8）；Third stage voltage offset element is by A resistance（R3）, B resistance（R4）, C resistance（R5）, D resistance（R6）, DC power supply（10）
With integrated operatinoal amplifier（9）Composition, A resistance（R3）With B resistance（R4）And integrated operatinoal amplifier（9）Cathode connects, A resistance（R3）'s
The other end is grounded, B resistance（R4）The other end and integrated operatinoal amplifier（9）Output end connects, C resistance（R5）With the second step voltage with
With device（8）Connection, DC power supply（10）With D resistance（R6）Connection, C resistance（R5）And D resistance（R6）The other end and integrated transporting discharging
Device（9）Connection；Integrated operatinoal amplifier（9）Output end is connected with current-limiting resistance（R7）.
3. a kind of large-sized photovoltaic power station as claimed in claim 2 ferromagnetic resonance detection and restraining device, it is characterised in that：Control
System module（3）It is connected with LCD screen, SD card storage, control system module（3）Ethernet is also connected by DM9000 network interface cards,
Ethernet connects host computer.
4. ferromagnetic resonance detection in a kind of large-sized photovoltaic power station as claimed in claim 1,2 or 3 and restraining device, feature exist
In：The device further includes power supply module（5）, power supply module（5）With sampling voltage regulating module（1）, data processing module（2）, control
System module（3）And switching value output module（4）Connection.
5. a kind of large-sized photovoltaic power station as claimed in claim 4 ferromagnetic resonance detection and restraining device, it is characterised in that：Control
System module（3）Using commercially available S3C2440 as control chip；Fling-cut switch（7）For 24V contactors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810427924.8A CN108667000B (en) | 2018-05-07 | 2018-05-07 | Ferromagnetic resonance detection and suppression device for large photovoltaic power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810427924.8A CN108667000B (en) | 2018-05-07 | 2018-05-07 | Ferromagnetic resonance detection and suppression device for large photovoltaic power station |
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| Publication Number | Publication Date |
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| CN108667000A true CN108667000A (en) | 2018-10-16 |
| CN108667000B CN108667000B (en) | 2020-10-02 |
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| CN201810427924.8A Active CN108667000B (en) | 2018-05-07 | 2018-05-07 | Ferromagnetic resonance detection and suppression device for large photovoltaic power station |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625383A (en) * | 2009-08-06 | 2010-01-13 | 东南大学 | On-line monitoring device for power quality |
| CN203929870U (en) * | 2014-04-12 | 2014-11-05 | 国家电网公司 | A kind of superpotential harvester based on Zinc-oxide piezoresistor |
| CN206164080U (en) * | 2016-10-26 | 2017-05-10 | 安徽巨森电器有限公司 | Microcomputer harmonic elimination device |
| CN106992506A (en) * | 2017-06-02 | 2017-07-28 | 云南电网有限责任公司电力科学研究院 | A kind of fuse protection device and method applied to electromagnetic potential transformer |
-
2018
- 2018-05-07 CN CN201810427924.8A patent/CN108667000B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625383A (en) * | 2009-08-06 | 2010-01-13 | 东南大学 | On-line monitoring device for power quality |
| CN203929870U (en) * | 2014-04-12 | 2014-11-05 | 国家电网公司 | A kind of superpotential harvester based on Zinc-oxide piezoresistor |
| CN206164080U (en) * | 2016-10-26 | 2017-05-10 | 安徽巨森电器有限公司 | Microcomputer harmonic elimination device |
| CN106992506A (en) * | 2017-06-02 | 2017-07-28 | 云南电网有限责任公司电力科学研究院 | A kind of fuse protection device and method applied to electromagnetic potential transformer |
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| CN108667000B (en) | 2020-10-02 |
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