CN104348157A - System and method for filtering current harmonics in ocean platform electric network - Google Patents
System and method for filtering current harmonics in ocean platform electric network Download PDFInfo
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- CN104348157A CN104348157A CN201310347293.6A CN201310347293A CN104348157A CN 104348157 A CN104348157 A CN 104348157A CN 201310347293 A CN201310347293 A CN 201310347293A CN 104348157 A CN104348157 A CN 104348157A
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- harmonic
- offset current
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- harmonic components
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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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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The embodiment of the invention provides a system and a method for filtering current harmonics in an ocean platform electric network. The system comprises a harmonic separation device, a compensation current generating device and a regulating monitoring device, wherein the harmonic separation device is configured to separate harmonic components of the current, the compensation current generating device is configured to generate compensation current used for compensating the harmonic components and providing the compensation current to the electric network, and the regulating monitoring device is coupled with the harmonic separating device and the compensation current generating device, and is configured to determine the compensation signals on the basis of the harmonic components and the compensation current, wherein compensation signals are bed back to the compensation current generating device to be used for regulating a compensation current installing element and a guide rail installing structure comprising the installing element. According to the system and the method, the harmonic current generated by a nonlinear load of a platform power supply system can be effectively filtered, so that the harmonic government of the platform achieves the expected effect, the electric energy quality of the platform power supply system is improved, and the platform electric network operation reliability is improved.
Description
Technical field
The embodiments of the present invention relate to dynamic harmonic field in electric power system, relate more specifically to a kind of system and method for filtering harmonic current in ocean platform electrical network.
Background technology
At present, the development and utilization to marine resources is worldwide all constantly strengthened, particularly to the oil in coastal waters, the development and utilization of natural gas resource.Supply of electric power is then the important step in oil, gas exploitation.Due to the most all wide aparts of each oil gas field in sea, in ocean platform electric power system, Offshore Platform electrical network and small ocean platform electrical network can be divided into.Offshore Platform electrical network often with land electrical network for rely on, platform self power generation is standby; Small ocean platform electrical network is with central platform generating (or generating ship) for source, and each satellite well group platform is for supporting.The supply path of platform electrical network adopts emanant and chain type to combine to each well group platform power by power supply by submarine cable.This supply network pattern, has higher requirement to the power supply reliability of each well group platform, if certain platform is once break down, causes switch trip, is had an impact by multiple platforms of connecting to next stage.Therefore, how to improve the power supply reliability of each well group platform, whole electrical network is all extremely important.
Due to the extensive use of the nonlinear load such as frequency converter, uninterrupted power supply at sea platform, cause harmonic content in platform electrical network significantly to increase, grid supply quality degradation, the electric network fault number of times brought thus is also in rising trend.Harmonic problem on a platform not only affects the security of operation of this platform device, but also can pass through supply path, brings potential safety hazard to other platforms.
Along with the production-scale continuous expansion of offshore platform, platform is unattended progressively to be implemented, and the popularizing gradually of platform electric power system networking, and the requirement of offshore platform electric power system to reliability is more and more higher, the power supply quality of platform electrical network receives publicity day by day, and harmonic wave control problem is particularly outstanding.
Summary of the invention
In view of the technical problem that above-mentioned prior art exists, the invention provides a kind of harmonic current of production platform electric power system that makes to reduce, be conducive to the quality of power supply improving system power supply power supply, improve the reliability of electric power system, strengthen the power network harmonic wave management technology of platform power equipment and power consumption equipment safe operation, to solve the shortcoming in above-mentioned mounting means at least in part.
According to an aspect of the present invention, provide a kind of system for filtering harmonic current in ocean platform electrical network, comprising: harmonic wave separation device, it is configured to the harmonic components being separated described electric current; Offset current generating apparatus, it is configured to generate the offset current for compensating described harmonic components, and described offset current is provided to described electrical network; And adjustment monitoring device, it is coupled in described harmonic wave separation device and described offset current generating apparatus, be configured to based on described harmonic components and described offset current determination compensating signal, wherein said compensating signal is fed to described offset current generating apparatus, for the described offset current of adjustment.
According to Alternate embodiments of the present invention, described adjustment monitoring device is further configured to and the difference of described harmonic components and described offset current is defined as described compensating signal.
According to Alternate embodiments of the present invention, described system is disposed in cabinet, and wherein, described system also comprises control device, and described control device is disposed on the cabinet door of described cabinet.According to further Alternate embodiments of the present invention, described cabinet door is laid with knob-operated mechanism, described knob-operated mechanism can operate one or more devices of described cabinet inside when not opening described cabinet door.Further, described knob-operated mechanism can interlock with described cabinet door.
According to Alternate embodiments of the present invention, also comprise heat abstractor, described heat abstractor adopts back of the body formula air channel and/or forced air cooling.
According to an aspect of the present invention, a kind of method for filtering harmonic current in ocean platform electrical network is provided, comprises: the harmonic components being separated described electric current; Generate the offset current for compensating described harmonic components, and described offset current is provided to described electrical network; And based on described harmonic components and described offset current determination compensating signal, wherein said compensating signal is for adjusting described offset current.
According to Alternate embodiments of the present invention, comprise based on described harmonic components and described offset current determination compensating signal: the difference of described harmonic components and described offset current is defined as described compensating signal.
According to Alternate embodiments of the present invention, described method is implemented in cabinet, and wherein, implements on the cabinet door of described cabinet the control of described method.According to further Alternate embodiments of the present invention, described cabinet door provides knob-operated mechanism, described knob-operated mechanism can operate one or more devices of described cabinet inside when not opening described cabinet door.Further, described knob-operated mechanism and described cabinet door interlock.
According to Alternate embodiments of the present invention, also comprise heat radiation step, described heat radiation step adopts back of the body formula air channel and/or forced air cooling to implement.
By said system and method, can effectively filtering ocean platform electric power system nonlinear load produce harmonic current, the harmonic wave control of platform is produced a desired effect, improves the quality of power supply of platform power system, and improve the reliability of ocean platform operation of power networks.
Accompanying drawing explanation
When reading the detailed description hereafter to exemplary embodiment by reference to the accompanying drawings, these and other object, feature and advantage will become apparent, in the accompanying drawings:
Fig. 1 is the system block diagram for filtering harmonic current in ocean platform electrical network according to one aspect of the invention;
Fig. 2 is the method flow diagram for filtering harmonic current in ocean platform electrical network according to a further aspect of the invention;
Fig. 3 is the exemplary circuit diagram for the system of filtering harmonic current in ocean platform electrical network in accordance with a preferred embodiment of the present invention;
Fig. 4 A and Fig. 4 B respectively illustrates the temporal pattern figure of system power source voltage electric current before and after harmonic wave control;
Fig. 5 is the harmonic wave timing waveform of the system for filtering harmonic current in ocean platform electrical network according to the present invention under different working modes; And
Fig. 6 A-6C is the structural representation arranged in rack for the system of filtering harmonic current in ocean platform electrical network in accordance with a preferred embodiment of the present invention.
Embodiment
Some exemplary embodiments below with reference to the accompanying drawings describe principle of the present invention and spirit.Should be appreciated that describing these embodiments is only used to enable those skilled in the art understand better and then realize the present invention, and not limit the scope of the invention by any way.
Fig. 1 is the block diagram of the system 100 (sometimes referred to as filtering system, or more particularly referred to as filter) for filtering harmonic current in ocean platform electrical network according to one aspect of the invention.
As shown in Figure 1, system 100 comprises harmonic wave separation device 101, offset current generating apparatus 102 and adjustment monitoring device 103.Wherein, harmonic wave separation device 101 is configured to the harmonic components being separated electric current in electrical network.In a preferred embodiment of the invention, the electric current in electrical network can come (such as real-time) by foreign current instrument transformer CTe and gather, and isolates harmonic components wherein by internal monitoring circuit.Offset current generating apparatus 102 is configured to generate the offset current for compensating described harmonic components, and described offset current is provided to electrical network.In a concrete realization, can the offset current contrary with the harmonic wave equal and opposite in direction phase place in network system be gone out by insulated gate bipolar transistor (IGBT) inversion and inject network system, thus be sinusoidal wave by mains side current compensation, realize the function of filtering harmonic wave.Those skilled in the art should know, this realization is only exemplary, and should as limitation of the present invention.Monitoring device 103 is regulated to be coupled in described harmonic wave separation device and described offset current generating apparatus, be configured to based on described harmonic components and described offset current determination compensating signal, wherein said compensating signal is fed to described offset current generating apparatus 102, for the described offset current of adjustment.
Because the output offset current of filtering system is according to harmonic content dynamic change, therefore there will not be the problem of overcompensation.In addition, filtering system has internal overload defencive function, and when the harmonic content of system is greater than filtering system capacity, system can export in 100% rated capacity in volitional check, and filter overload can not occur.
According to a preferred embodiment of the present invention, system 100 can be parallel in network system.Such as, the inlet wire of system 100 can be installed in parallel by air switch and platform low-voltage power supply system.In addition, the parallel connection of multiple filtering system 100 can also be such as adopted to use.
Alternatively, regulate monitoring device 103 to be further configured to and harmonic components and offset current are compared, the difference between them is defined as compensating signal.
In optional realization, system 100 can be disposed in the cabinet (hereinafter describing in detail) of such as rack, and wherein, system 100 can also comprise control device (not shown in figure 1), and this control device is disposed on the cabinet door of this cabinet.For example, control device can adopt high-speed dsp chip, utilizes the harmonic spectrum in DSL algorithm calculating sampling signal, touch screen operation, control device is configured with RS485/RS232C, Ethernet and USB interface, supports the communications protocol such as Modbus TCP/IP Ethernet.
Another optionally, system 100 comprises heat abstractor (not shown in figure 1), this heat abstractor adopts back of the body formula air channel and/or forced air cooling, improve the efficiency of radiator, make device internal structure compacter, reduce installing space, more can meet the requirement of offshore platform limited space and preciousness.
In addition, consider the requirement of degree of protection (degree of protection of this system is such as IP54), the present invention is also laid with knob-operated mechanism alternatively on described cabinet door, described knob-operated mechanism can operate one or more devices (such as, isolating switch) of described cabinet inside when not opening described cabinet door.This layout can reduce the open-assembly time of device internal component to greatest extent, adapts to the impact of offshore platform severe corrosive environment (such as high humility and salt fog) better.Knob-operated mechanism preferably interlocks with described cabinet door.
Meanwhile, filter also such as can increase IGBT module working temperature in controller screen display function, and the real-time device for ejecting of control flow runs warning message, and personnel easy to use understand the running status of filtering system 100 intuitively.
Fig. 2 is the flow chart of the method 200 for filtering harmonic current in ocean platform electrical network according to a further aspect of the invention.
First method 200 enters step S201 after starting, and is separated the harmonic components of electric current in electrical network.
Next, method 200 enters step S202, generates the offset current for compensating described harmonic components, and described offset current is provided to described electrical network.
Then, method 200 enters step S203, and based on described harmonic components and described offset current determination compensating signal, wherein said compensating signal is for adjusting described offset current.
According to an embodiment of the invention, step S203 also comprises alternatively the difference of described harmonic components and described offset current is defined as described compensating signal.
According to an embodiment of the invention, method 200 is implemented alternatively in cabinet, and wherein, implements on the cabinet door of described cabinet the control of described method 200.
According to an embodiment of the invention, method 200 also comprises heat radiation step alternatively, and described heat radiation step adopts back of the body formula air channel and/or forced air cooling to implement.
According to an embodiment of the invention, method 200 also provides knob-operated mechanism alternatively on described cabinet door, and described knob-operated mechanism can operate one or more devices of described cabinet inside when not opening described cabinet door.
According to an embodiment of the invention, in method 200, described knob-operated mechanism and described cabinet door interlock.
So far, method 200 terminates.
Fig. 3 is the exemplary circuit diagram for the system of filtering harmonic current in ocean platform electrical network in accordance with a preferred embodiment of the present invention.System Working Principle for filtering harmonic current in electrical network according to the present invention is as follows: as shown in the figure, when after breaker closing, first by pre-charge resistance, the capacitor of DC bus is charged, this process is by predetermined hold-time, in such as 8 seconds, object is the moment impact to DC bus capacitance after preventing from powering on.After busbar voltage Vdc reaches rated value, pre-charge contactor closes.DC capacitor, as energy-storage travelling wave tube, provides energy for outwards exporting offset current by IGBT inverter and inner reactor.Simultaneously direct current capacitor provides working power by internal electric source control board control module internally and electronic circuit.Active filter gathers by foreign current instrument transformer (CTe) the harmonic wave separation module that current signal delivers to control module, and harmonic components, by first-harmonic component separation, is delivered to adjustment and monitoring modular by this module.The system harmonics composition collected and the issued offset current of filter can compare by this module, obtain difference and output to drive circuit as real-Time Compensation signal, and compensation harmonic pulse current injectingt in electrical network, is realized the function of filtering harmonic wave by triggering IGBT inverter.
In a preferred concrete realization, the operating voltage of filtering system as shown in Figure 3 can be 208V ~ 480V, such as, be set to 400V, and rated capacity is 300A.System is connected in parallel by the cable of 3 × 185mm2, air switch and platform low-voltage power supply system.In addition, foreign current instrument transformer (CTe) both can be installed on mains side also can be installed on load side, and it can selectivity setting in system parameter settings.Two CTe are installed on system power supply side in the present embodiment, i.e. the inlet wire A phase of transformer secondary low-pressure side and B phase busbar place.In a preferred embodiment, in order to ensure systematic sampling precision, foreign current instrument transformer must adopt 400Hz, 25VA, precision at least 1.0 grades.
In the such as exemplary circuit for the system of filtering harmonic current in ocean platform electrical network as shown in Figure 3, can a filtering by the optimum configurations of system, also can carry out reactive power compensation while filtering.In addition, this circuit also at least tool have the following advantages in one or more: the harmonic wave of the whole or selected number of times simultaneously in filtering 2 ~ 50 underrange; For each compensation sequence, export ratio 0 ~ 100% can be set; Response time is less than 100 μ s, is less than 10ms (1/2 cycle) to the harmonic wave full remuneration time of Spline smoothing; Moment 225% rated capacity is provided to shove compensations, improvement flickering and voltage fluctuation; Automatically system resonance can be eliminated; And there is automatic current limiting function, can not generation systems overload.
Fig. 4 A and Fig. 4 B respectively illustrates the temporal pattern figure of system power source voltage electric current before and after harmonic wave control.Fig. 4 A is original system supply voltage electric current temporal pattern figure before harmonic wave control, and wherein voltage waveform has several places significant depressions, current waveform generation Severe distortion.And Fig. 4 B is system power source voltage electric current temporal pattern figure after harmonic wave control, wherein voltage waveform depression not obvious, electric current close to sinusoidal waveform, filter effect highly significant.
Fig. 5 is the harmonic wave timing waveform of the system for filtering harmonic current in ocean platform electrical network according to the present invention under different working modes.As shown in Figure 5, the situation of the wave recording system harmonics filtering under filtering and reactive power compensation simultaneously mode of operation and independent filtering operation pattern that is active filter system.After filtering system drops into, 5 subharmonic on average drop to 88A from 274A, and 5 subharmonic rejection rates are 67%.7 subharmonic on average drop to 19A from 58A, and 11 subharmonic on average drop to 13A from 50A.Its technical performance is much better than existing conventional filter.
Fig. 6 A-6C is the structural representation arranged in rack for the system of filtering harmonic current in ocean platform electrical network in accordance with a preferred embodiment of the present invention.Wherein, Fig. 6 A is the vertical view of rack (after removing rack lid), and Fig. 6 B is the front view of rack (removing cabinet behind the door), and Fig. 6 C is (after removing cabinet sidewalls) right view.As shown in Fig. 6 A and Fig. 6 C, position near backboard in rack can be provided with one or more radiator from top to bottom, the particular location of this one or more radiator can be arranged as required, such as be positioned near the top of backboard, middle part and/or bottom, allegedly here belong to " near backboard " and comprise and be directly attached on backboard or keep certain distance with backboard.This one or more radiator and the space arranging it constitute back of the body formula air channel.As shown in Figure 6B, be also such as provided with blower fan in the bottom of rack, thus carry out forced air cooling, realize the heat radiation of system better.It will be appreciated by those skilled in the art that the layout of system in rack shown by Fig. 6 A-Fig. 6 C is only schematic, be not limited to protection scope of the present invention.
As previously mentioned, the invention provides the Active Power Filter Technology of a kind of fast response time, complete function, the harmonic current that effective filtering platform power mission nonlinear load produces, the harmonic wave control of platform is made to reach Expected Results, improve the quality of power supply of platform power system, improve the reliability of ocean platform operation of power networks.
Give specification of the present invention for the object illustrated and describe, but it is not intended to be exhaustive or be limited to the invention of disclosed form.It may occur to persons skilled in the art that a lot of amendment and variant.Therefore; execution mode is to principle of the present invention, practical application are described better and enable the other staff in those skilled in the art understand following content and select and describe; namely; under the prerequisite not departing from spirit of the present invention, all modifications made and replacement all will fall in the scope of claims definition.
Claims (12)
1., for a system for filtering harmonic current in ocean platform electrical network, comprising:
Harmonic wave separation device, it is configured to the harmonic components being separated described electric current;
Offset current generating apparatus, it is configured to generate the offset current for compensating described harmonic components, and described offset current is provided to described electrical network; And
Regulate monitoring device, it is coupled in described harmonic wave separation device and described offset current generating apparatus, be configured to based on described harmonic components and described offset current determination compensating signal, wherein said compensating signal is fed to described offset current generating apparatus, for the described offset current of adjustment.
2. system according to claim 1, wherein, described adjustment monitoring device is further configured to and the difference of described harmonic components and described offset current is defined as described compensating signal.
3. system according to claim 1, wherein, described system is disposed in cabinet, and wherein, described system also comprises control device, and described control device is disposed on the cabinet door of described cabinet.
4. system according to claim 1, also comprises heat abstractor, and described heat abstractor adopts back of the body formula air channel and/or forced air cooling.
5. system according to claim 3, wherein, described cabinet door is laid with knob-operated mechanism, and described knob-operated mechanism can operate one or more devices of described cabinet inside when not opening described cabinet door.
6. system according to claim 5, wherein, described knob-operated mechanism and described cabinet door interlock.
7., for a method for filtering harmonic current in ocean platform electrical network, comprising:
Be separated the harmonic components of described electric current;
Generate the offset current for compensating described harmonic components, and described offset current is provided to described electrical network; And
Based on described harmonic components and described offset current determination compensating signal, wherein said compensating signal is for adjusting described offset current.
8. method according to claim 7, wherein, comprises based on described harmonic components and described offset current determination compensating signal: the difference of described harmonic components and described offset current is defined as described compensating signal.
9. method according to claim 7, wherein, described method is implemented in cabinet, and wherein, implements on the cabinet door of described cabinet the control of described method.
10. method according to claim 7, also comprises heat radiation step, and described heat radiation step adopts back of the body formula air channel and/or forced air cooling to implement.
11. methods according to claim 9, wherein, described cabinet door provide knob-operated mechanism, and described knob-operated mechanism can operate one or more devices of described cabinet inside when not opening described cabinet door.
12. methods according to claim 11, wherein, described knob-operated mechanism and described cabinet door interlock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310347293.6A CN104348157A (en) | 2013-08-09 | 2013-08-09 | System and method for filtering current harmonics in ocean platform electric network |
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| CN201310347293.6A CN104348157A (en) | 2013-08-09 | 2013-08-09 | System and method for filtering current harmonics in ocean platform electric network |
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| CN104348157A true CN104348157A (en) | 2015-02-11 |
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