CN103545812B - Ultraharmonics and idle electric power compensation energy-saving device of active power grid - Google Patents
Ultraharmonics and idle electric power compensation energy-saving device of active power grid Download PDFInfo
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- CN103545812B CN103545812B CN201310492608.6A CN201310492608A CN103545812B CN 103545812 B CN103545812 B CN 103545812B CN 201310492608 A CN201310492608 A CN 201310492608A CN 103545812 B CN103545812 B CN 103545812B
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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
- Y02E40/30—Reactive power compensation
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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 relates to the technical field of active intelligent filters, in particular to an ultraharmonics and idle electric power compensation energy-saving device of an active power grid. The device comprises a three-phase power grid source, a load power supply transformer, power utilization load, a power grid voltage and current detection device, a high-voltage grid connection device, a power compensation conversion device, a load voltage and current detection device, a system protection control device, a PWM inverter, and a DSP-FFT processing device. Compared with the prior art, ultraharmonics and idle electric power in the power grid are compensated with high precision and high speed, and stability and security of power grid quality are improved. And meanwhile, ultraharmonics and idle electric power are converted into active power to be sent back to the power grid, so electric energy is greatly saved. After ultraharmonics and idle electric power are compensated, noises and temperature of the transformer are lowered, and service life of the device can be prolonged. Compared with a passive filter and a subsection switching compensation device, the ultraharmonics and idle electric power compensation energy-saving device of the active power is small in size, high in compensation precision, and is applicable to various dynamic transient variable loads.
Description
Technical field
The present invention relates to active intelligent filter technical field, specifically a kind of active Electric Network Higher Harmonic and var compensation energy-saving device.
Background technology
Along with the development of world energy sources crisis, developing the new energy is the important proposition of World Science, saves the existing energy current important research topic of current scientific circles especially simultaneously.Still need because tap a new source of energy and want time, and to save the existing energy be the task of top priority of the current world.It is the maximum field of world's power consumption that current ferrous metal is smelted with electrolytic aluminum smelting, and therefore energy-saving and emission-reduction are done when working as from metal smelt field head.China's field of steel metallurgy utilizes coreless induction furnace and arc furnace etc. to carry out arc-melting and electrolysis pyrolytic semlting is produced.Coreless induction furnace and arc furnace produce a large amount of high order harmonic components and var, electric furnace is less in first dress state current, short-circuit condition is similar between electrode when being fused into molten iron and aluminium liquid status, two kinds of operating state load currents are correlated with tens times, line voltage and electric current are caused significantly float, great impact is caused to electrical network, produce a large amount of high order harmonic component and var, electrical network and electric power system are produced fluctuate greatly, serious interference and pollution are caused to electrical network, the serious power supply quality that have impact on electrical network.
At present, what the employing of smelting iron and steel system was maximum is LC filter and segmentation switching filters, but can not meet the needs of the dynamic mutation state of smelting iron and steel arc furnace and coreless induction furnace; LC filter and segmentation switching filters compensation precision low, be easy to produce resonance and impact; Although SVG and SVC can improve power factor, when power consumption increases, above existing compensation equipment volume is large, power consumption is large, compensation precision is low, cannot meet the needs of electric power system.
The current patent No. is the utility model patent of 201220183143, disclose a kind of active power filter, it comprises: real-time detection circuit, by detecting in real time the electric current of load, obtain load current waveform, according to the analysis result of real-time detection circuit, thus obtain the harmonic current component needing to compensate; Control and compensation circuit is to the payment of harmonic current; By reverse for the harmonic current component needing to compensate, by IGBT inverter, reverse current is injected electric power system; Realize the humorous wave energy of filtering.But which compensation precision is low, poor reliability.
The patent No. is the utility model patent of 201020254744 in addition, a kind of hybrid active filter is proposed, it is characterized in that: comprise primary system part and electrical secondary system part, described primary system part comprises active filter and the passive filter of series connection, described active filter can not bear the fundamental voltage in grid alternating current source, resistance toly force down, installed capacity is little, can not be suitable for high voltage large capcity electric power system.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, utilize resonance filter principle and calculate and intelligent control technology based on DSP-FFT high speed processing, realize the active electrical network energy-saving compensated system of high-tension high-power intelligence with this.
For achieving the above object, design a kind of active Electric Network Higher Harmonic and var compensation energy-saving device, comprise the electric network source of three-phase, load supplying transformer, by electric loading, line voltage current sensing means, high pressure grid-connecting apparatus, electric power compensation converting means, load voltage current sensing means, system protection control device, PWM inverter, DSP-FFT processing unit, wherein load supplying transformer 2, connect respectively in electrical network by electric loading 1, it is characterized in that: line voltage current sensing means 3 in parallel successively in the electrical network between power supply with load supplying transformer 2, high pressure grid-connecting apparatus 7, the output of line voltage current sensing means 3 connects the input of measure voltage & current A/D converter 4, the output of measure voltage & current A/D converter 4 connects a signal input part of DSP-FFT processing unit 5, a signal output part of a signal input part connected system protecting control device 6 of high pressure grid-connecting apparatus 7, the signal input part of system protection control device 6 connects the first signal output part of DSP-FFT processing unit 5, first electric power transfer line end of high pressure grid-connecting apparatus 7 is bi-directionally connected the first electric power transfer line end of electric power compensation converting means 9, second electric power transfer line end of high pressure grid-connecting apparatus 7 is bi-directionally connected the second electric power transfer line end of electric power compensation converting means 9, another signal output part of system protection control device 6 connects the signal end of electric power compensation converting means 9, the another signal output part of system protection control device 6 connects a signal input part of PWM inverter 8,3rd electric power transfer line end of electric power compensation converting means 9 is bi-directionally connected the first electric power transfer line end of PWM inverter 8,4th electric power transfer line end of electric power compensation converting means 9 is bi-directionally connected the second electric power transfer line end of PWM inverter 8, another signal input part of PWM inverter 8 connects the secondary signal output of DSP-FFT processing unit 5, the secondary signal input of DSP-FFT processing unit 5 connects the signal output part of A/D converter 11, the signal input part of A/D converter 11 connects the signal output part of load voltage current sensing means 10, the signal input part of load voltage current sensing means 10 also links load supplying transformer 2 and with the electric power transfer bus between electric loading, DSP-FFT processing unit 5 controls line voltage current sensing means 3 and measure voltage & current A/D converter 4, high order harmonic component in electrical network and var and power network fluctuation impact conditions are detected, calculated and fft analysis, calculate PWM inverter 8 and the controling parameters of electric power compensation converting means 9, control PWM inverter 8 by DSP-FFT processing unit 5, with electric power compensation converting means 9, the high order harmonic component in electrical network and var are carried out absorption energy storage, inversion, phase shift for be transmitted back to electrical network again with electrical network same frequency, synchronous active power, simultaneously, when electrical network or electric power compensation converting means 9 break down, control signal is sent to high pressure grid-connecting apparatus 7 by DSP-FFT processing unit 5 control system protecting control device 6, high pressure grid-connecting apparatus 7 is made to cut off electrical network, simultaneity factor protecting control device 6 sends control signal to the signal end of PWN inverter 8 with electric power compensation converting means 9, close PWN inverter 8 and electric power compensation converting means 9, thus protection electric power compensation converting means 9 and electrical network.
3rd signal output part connecting fluid crystal display screen 12 of described DSP-FFT processing unit 5.
Described DSP-FFT processing unit 5 is also provided with some communication interfaces 13, and some communication interfaces 13 connect warning device and/or host computer.
Described electric power compensation converting means 9 comprises harmonic wave filter compensation device 9-1 and power-converting device 9-2, described high pressure grid-connecting apparatus 7 comprises high pressure grid-connection control device 7-1, high pressure network regulation sensor 7-2, the grid-connected voltage regulator 7-3 of high pressure, first electric power transfer line end of PWM inverter 8 is bi-directionally connected the 3rd electric power transfer line end of harmonic wave filter compensation device 9-1, the first electric power transfer line end of harmonic wave filter compensation device 9-1 adopts bi-directional bus to connect high pressure respectively and the first electric power transfer line end of the first electric power transfer line end of network regulation sensor 7-2 and the grid-connected voltage regulator 7-3 of high pressure, second electric power transfer line end of PWM inverter 8 is bi-directionally connected an electric power transfer line end of power-converting device 9-2, and another electric power transfer line end of power-converting device 9-2 adopts bi-directional bus to connect high pressure respectively and another electric power transfer line end of another electric power transfer line end of network regulation sensor 7-2 and the grid-connected voltage regulator 7-3 of high pressure, high pressure another electric power transfer line end of network regulation sensor 7-2 are bi-directionally connected an electric power transfer line end of high pressure grid-connection control device 7-1, another electric power transfer line end of the grid-connected voltage regulator 7-3 of high pressure is bi-directionally connected another electric power transfer line end of high pressure grid-connection control device 7-1, a signal output part of the signal input part connected system protecting control device 6 of high pressure grid-connection control device 7-1.
Described system protection control device 6 exports and controls high pressure grid-connection control device 7-1, and pressure grid-connection control device 7-1 adopts high-voltage switch gear.
Described DSP-FFT processing unit 5 controls PWM inverter 8 drived control harmonic filtering installation 9-1, compensates the higher harmonic voltage that electrical network produces.
It is the active power with line voltage same-phase same frequency that dsp processor control PWM inverter 8 in described DSP-FFT processing unit 5 carrys out drived control harmonic filtering installation 9-1 and power-converting device 9-2 the var phase shift in electrical network.
The present invention compared with the existing technology, carries out high-precision high-speed compensation to the high order harmonic component in electrical network and var, improves power grid quality, reduces electrical network interference, improves grid stability and fail safe; High order harmonic component and var are converted to active power loopback electrical network simultaneously, obtain efficient energy-saving effect, energy-saving and emission-reduction, save a large amount of electric power electric energy; After high order harmonic component and var compensate, reduce transformer noise and temperature, equipment life and dielectric strength can be increased substantially, increase transformer transmission and bearer cap, increase carrying load ability, reduce transformer to waste and line loss, substantially increase the capacity of transformer and transmission facility, increase the life-span of transformer and transmission facility; Compare with segmentation switching compensation arrangement with passive filter, have volume little, compensation precision is high, be adapted to all kinds of dynamic instantaneous change for load, after adopting this compensation arrangement to compensate, dynamic characteristic is good, and compensation precision is high, power factor is high, save a large amount of electric energy, improve stability and the fail safe of electric power system, when same compensation capacity, volume is only 1/8th of passive filter, is only 1/4th of segmentation switching compensation arrangement and SVC and SVG volume.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present invention.
Fig. 2 is the connection diagram of PWM inverter and Compensation Transformation device and high pressure grid-connecting apparatus in the present invention, system protection control device.
Embodiment
Now by reference to the accompanying drawings the present invention is further described.
Embodiment 1
See Fig. 1, the present invention includes the electric network source of three-phase, load supplying transformer, by electric loading, line voltage current sensing means, high pressure grid-connecting apparatus, electric power compensation converting means, load voltage current sensing means, system protection control device, PWM inverter, DSP-FFT processing unit, wherein, DSP-FFT processing unit 5 refers to the dsp processor being embedded with fft analysis algorithm, load supplying transformer 2, connect respectively in electrical network by electric loading 1, it is characterized in that: line voltage current sensing means 3 in parallel successively in the electrical network between power supply with load supplying transformer 2, high pressure grid-connecting apparatus 7, the output of line voltage current sensing means 3 connects the input of measure voltage & current A/D converter 4, the output of measure voltage & current A/D converter 4 connects a signal input part of DSP-FFT processing unit 5, a signal output part of a signal input part connected system protecting control device 6 of high pressure grid-connecting apparatus 7, the signal input part of system protection control device 6 connects the first signal output part of DSP-FFT processing unit 5, first electric power transfer line end of high pressure grid-connecting apparatus 7 is bi-directionally connected the first electric power transfer line end of electric power compensation converting means 9, second electric power transfer line end of high pressure grid-connecting apparatus 7 is bi-directionally connected the second electric power transfer line end of electric power compensation converting means 9, another signal output part of system protection control device 6 connects the signal end of electric power compensation converting means 9, the another signal output part of system protection control device 6 connects a signal input part of PWM inverter 8, 3rd electric power transfer line end of electric power compensation converting means 9 is bi-directionally connected the first electric power transfer line end of PWM inverter 8, 4th electric power transfer line end of electric power compensation converting means 9 is bi-directionally connected the second electric power transfer line end of PWM inverter 8, another signal input part of PWM inverter 8 connects the secondary signal output of DSP-FFT processing unit 5, the secondary signal input of DSP-FFT processing unit 5 connects the signal output part of A/D converter 11, the signal input part of A/D converter 11 connects the signal output part of load voltage current sensing means 10, the signal input part of load voltage current sensing means 10 also links load supplying transformer 2 and with the electric power transfer bus between electric loading.The present invention is mainly for smelting iron and steel system, electrolytic aluminium aluminium oxide and other metal smelt systems.Therefore the electrical loads such as metal smelt rectifier transformer such as smelting iron and steel coreless induction furnace electric arc furnace smelting transformer-supplied system or high pressure steel rolling dynamical system, electrolytic aluminium are mainly comprised by electric loading in this example.
Described electric power compensation converting means 9 comprises harmonic wave filter compensation device 9-1 and power-converting device 9-2, described high pressure grid-connecting apparatus 7 comprises high pressure grid-connection control device 7-1, high pressure network regulation sensor 7-2, the grid-connected voltage regulator 7-3 of high pressure, first electric power transfer line end of PWM inverter 8 is bi-directionally connected the 3rd electric power transfer line end of harmonic wave filter compensation device 9-1, the first electric power transfer line end of harmonic wave filter compensation device 9-1 adopts bi-directional bus to connect high pressure respectively and the first electric power transfer line end of the first electric power transfer line end of network regulation sensor 7-2 and the grid-connected voltage regulator 7-3 of high pressure, second electric power transfer line end of PWM inverter 8 is bi-directionally connected an electric power transfer line end of power-converting device 9-2, and another electric power transfer line end of power-converting device 9-2 adopts bi-directional bus to connect high pressure respectively and another electric power transfer line end of another electric power transfer line end of network regulation sensor 7-2 and the grid-connected voltage regulator 7-3 of high pressure, high pressure another electric power transfer line end of network regulation sensor 7-2 are bi-directionally connected an electric power transfer line end of high pressure grid-connection control device 7-1, another electric power transfer line end of the grid-connected voltage regulator 7-3 of high pressure is bi-directionally connected another electric power transfer line end of high pressure grid-connection control device 7-1, a signal output part of the signal input part connected system protecting control device 6 of high pressure grid-connection control device 7-1.
Described system protection control device 6 exports and controls high pressure grid-connection control device 7-1, and pressure grid-connection control device 7-1 adopts high-voltage switch gear.
3rd signal output part of described DSP-FFT processing unit 5 connects display screen 12, and liquid crystal display can be adopted here to be used for the electric current of the transformer showing current power load 1 in real time, voltage, power, reactive power, power factor, each higher harmonic content, load current, voltage condition by electric loading 1.
Described DSP-FFT processing unit 5 is also provided with some communication interfaces 13, and one of them communication interface 13 can connect warning device, and other communication interface can connect host computer, to carry out network data transmission and remote operation controls.Wherein, line voltage current sensing means 3 is controlled primarily of DSP-FFT processing unit 5, measure voltage & current A/D converter 4, A/D converter 11, warning device can also form fault detect control and warning system, undertaken analyzing by transient signal in DSP-FFT processing unit 5 pairs of electrical networks and estimated and predict, to electrical network, load and electric power compensation converting means 9 operating state are forecast, control and report to the police, simultaneously to electrical network, load and benefit electric power compensation converting means 9 send protecting control instruction, in avoiding fault to occur in early days, to electrical network, load and compensation arrangement carry out protection operation.For the purpose of the present invention, send early warning signal and operation execution instruction to network system, the isolating switch of the electric power compensation of control operation simultaneously converting means 9, makes electric power compensation converting means 9 cut off electrical network.Do not affect compensation arrangement when the grid collapses like this, do not affect operation of power networks when compensation arrangement breaks down.
Control principle of the present invention:
This bucking-out system is carried out detecting and constituent analysis for load dynamic change state and electrical network bus high order harmonic component and var by DSP-FFT processing unit 5, regulating and controlling electric power compensation converting means 9 is carried out with this, electrical network each harmonic is compensated, its harmonic wave filter compensation device 9-1 is regulated all the time and is operated in resonance condition, the impedance of harmonic wave filter compensation device 9-1 is zero for the relative impedances of each high order harmonic component, Q value is infinitely great, makes harmonic wave filter compensation device 9-1 always work in desirable compensation characteristic state.On the other hand, the interior resistance drop of harmonic wave filter compensation device 9-1 is compensated by PWM inverter 8 output voltage, therefore obtains high-precision compensation effect.
The bucking voltage that the present invention exports due to PWM inverter 8 is for resistance drop in harmonic wave filter compensation device 9-1.Therefore, the present invention can adapt to the compensation of the electric power system of high-tension high-power and the high order harmonic component of electrical network and var, forms high-power high voltage electrical network intelligence active filter system.
The present invention utilizes dsp processor at a high speed to the detection of higher harmonic voltage in electrical network and fft analysis process, and line voltage current signal is detected, calculate and analyze, and carry out predicting to electrical network variable condition and estimate, calculate the variable quantity of future time electric network state, utilize dsp controller to control PWM inverter 8 and produce amplitude with harmonic wave filter compensation device 9-1, frequency, the high order harmonic component bucking voltage of phase-adjustable, Electric Network Higher Harmonic and var are compensated, control power-converting device 9-2 simultaneously and high order harmonic component electric power and var are transformed to active power loopback electrical network, produce efficient energy-saving effect.
See Fig. 1, the present invention utilizes DSP-FFT processing unit 5 to control line voltage current sensing means 3 and measure voltage & current A/D converter 4, the high order harmonic component produced by electric loading 1 and var and power network fluctuation impact conditions are detected, calculate and fft analysis, calculate PWM inverter 8 and electric power compensation converting means 9 controling parameters, DSP-FFT processing unit 5 controls PWM inverter 8 and electric power compensation converting means 9, harmonic wave in electrical network and var are compensated, harmonic wave and var are converted to active power loopback electrical network simultaneously, energy-saving and emission-reduction, save a large amount of electric energy, improve power factor of electric network and power supply quality, reduce electrical network interference, improve stability and the fail safe of electric power system.
The present invention adopts DSP-FFT processing unit 5 and PWM inverter 8, electric power compensation converting means 9, electrical network is dropped into by high pressure grid-connecting apparatus 7, harmonic wave filter compensation device 9-1 in electric power compensation converting means 9 compensates the high order harmonic component of electrical network and var, control PWM inverter 8 by DSP-FFT processing unit 5 simultaneously, with power-converting device 9-2, high order harmonic component in electrical network and var are absorbed energy storage, inversion, phase shift for be transmitted back to electrical network with electrical network same frequency, synchronous active power, play high efficiency energy-saving effect.There is high order harmonic component and the var compensate function of high-speed, high precision thus, and harmonic wave and var are transformed to active power loopback electrical network, voltage ripple of power network is had to the function suppressing compensation and system protection simultaneously.
See Fig. 2, electric power compensation converting means 9 comprises harmonic wave filter compensation device 9-1 and power-converting device 9-2 two parts, the high order harmonic component of electrical network and var absorb via harmonic wave filter compensation device 9-1 and flow in its rectifier, high order harmonic component and var are carried out the power supply that rectification is re-used as harmonic wave filter compensation device 9-1 and electric power converter device 9-2, be 50HZ active power loopback electrical network by power-converting device 9-2 inversion, save a large amount of electric power.Produce the bucking voltage contrary with Electric Network Higher Harmonic voltage by harmonic wave filter compensation device 9-1 simultaneously and input electrical network by compensation arrangement, the high order harmonic component do not absorbed is compensated, produces high-precision compensation effect.
The present invention adopts DSP-FFT processing unit 5 to control voltage in line voltage current sensing means 3 and measure voltage & current A/D converter 4 pairs of electrical networks and electric current detects, and the voltage that will detect, electric current adopts fft algorithm to carry out analyzing and processing, calculate the composition of each high order harmonic component electric power and var in electrical network, PWM inverter 8 and electric power compensation converting means 9 is controlled by dsp controller, bucking voltage is produced by the harmonic wave filter compensation device 9-1 of electric power compensation converting means 9, by the power-converting device 9-2 of electric power compensation converting means 9, high order harmonic component and var are converted to active power simultaneously.Harmonic wave filter compensation device 9-1 and power-converting device 9-2 is connected to the grid by high pressure grid-connecting apparatus 7.
The feature of active power compensator of the present invention:
1. the invention belongs to active power compensator adopts the high order harmonic component of DSP-FFT processing unit 5 pairs of electric power systems and the composition of var to carry out examination and analysb, utilizes the amplitude, frequency and the phase place that also calculate each high order harmonic component and var fast.
2. control PWM inverter 8 by DSP-FFT processing unit 5 and electric power compensation converting means 9 forms high order harmonic component and var compensator, form and export bucking voltage, frequency, intelligent active power compensator that phase control is adjustable.
3. control PWM inverter 8 and electric power compensation converting means 9 by DSP-FFT processing unit 5, Electric Network Higher Harmonic and var are converted to active power via high pressure grid-connecting apparatus 7 loopback electrical network, save a large amount of electric energy.
4. utilize the current/voltage of DSP-FFT processing unit 5 pairs of electrical networks and electric power system and power factor to detect and accident analysis.System overvoltage, overcurrent, overload and system failure defencive function is carried out by system protection control device 6.
5. because the present invention is to high order harmonic component and var high-accuracy compensation, and the rush of current caused load variations in arc furnace production process and system voltage are suppressed, eliminate electric power system impact and voltage fluctuation, improve the power factor of electrical network, improve fail safe and the stability of network system, reduce power consumption, play a large amount of energy-saving effects.
6. show the electric current of arc furnace transformer, voltage, power, reactive power, power factor, each higher harmonic content, arc furnace transformer load condition, electric furnace transformer-supplied system state change in real time.
After steel mill's electric arc furnace smelting system adopts the present invention, to Monitoring Data interpretation of result, compensation principle of the present invention and energy-saving effect as follows:
1, electric arc furnace smelting electric power system high order harmonic component and var obtain effective compensation and improvement, and electrical network impacts and is controlled effectively with voltage fluctuation, and improve stability and the fail safe of electric power system, power grid quality is greatly improved.After compensating, average higher harmonic content drops to less than 1%, and power factor reaches more than 0.95 ~ 0.99.More than country and international standard is reached after compensation.
2. after adopting the present invention to compensate, high order harmonic component and var are converted to active power loopback electrical network, obtain efficient energy-saving effect, ton steel " active energy " economize on electricity reaches 36.012 degree, " capacity of idle power " economize on electricity reaches more than 63.2 degree, meritorious power saving rate improves more than 7.5% ~ 11.18%, and apparent power power saving rate reaches more than 18.6%.
3. arc furnace draws that electric arc is effective to be stablized with furnace temperature, and average every stove shortens 15 minutes the duration of heat ~ by 21 minutes, average blowing oxygen quantity saves 7.6%, and average steel power consumption per ton reduces more than 5% ~ 18%.
4. through contrasting same material close steel-making heat (batch) number tap identical with feeding quantity, arc furnace draws that arc efficiency is good, furnace temperature is stablized, make every stove have more steel 1.53 tons of steel ~ 2.86 ton steel, ton steel power consumption is reduced further, steel-making total cost is significantly lowered.
5. because high order harmonic component and var reduce greatly, so the noise vibration of arc furnace supply transformer and temperature are significantly declined, transformer temperature drops to 45.2 degree by 54.8 degree, transformer mean temperature declines 8.5 degree ~ 11.3 degree, equipment life and dielectric strength can be increased substantially, increase transformer transmission and bearer cap, increase carrying load ability.Carrying load ability can improve more than 15%.
6. transmission line power consumption reduces greatly, and transformer power consumption reduces greatly, significantly declines with electric loading power consumption.
7. reduce arc furnace frequently to drop into and the impact cut out electrical network, reduce transformer and electric equipment impact sound and vibrations, reduce line voltage and float, the stability of raising electrical network and fail safe.
8. the invention belongs to source filtering compensation system, compared with passive filter, segmentation switching filters, SVG, SVC, electric energy of the present invention is high, compensation precision is high, speed is fast, volume is little, stability and fail safe high.
In sum, this device drops into the high order harmonic component that produces electric power system after network system and var compensates, high order harmonic component and var are converted to active power loopback electrical network, obtain efficient energy-saving effect, effective suppression smelting arc furnace, coreless induction furnace, the system loadings such as rolling mill change the power network current that causes and impact the interference and harm of to float with line voltage and causing electrical network, reduce transformer and electric power system noise and vibrations, the temperature of reduction equipment, improve transformer and power consumption equipment bringing onto load capacity, improve stability and the fail safe of electric power system, energy-saving and emission-reduction, resultant effect is remarkable.The present invention is rational in infrastructure, runnability is stablized, there is Large Copacity dynamic tracing compensation control characteristic accurately, speed is fast, energy-saving efficiency is high, output voltage high power is large, to the various varying loading of electric power system, there is good adaptability, compensate transit time short, more than the several times of the compensation ability of other types active filter, may be used for the various smelting electrical network of below 110KV and power supply network and electric power system, be convenient to assembling safeguard, the invention belongs to voltage compensation type self-adapting intelligent digital active filter system, compare with segmentation switching compensation arrangement with passive filter, there is volume little, compensation precision is high, be adapted to all kinds of dynamic transient change load and various ferrous metal smelting system, aluminium oxide and Electrolytic Aluminum System, machining and dynamical system, wind power plant, oil plant, power plant and power supply network system, solve the problem existing for existing all kinds of filter.
Claims (7)
1. an active Electric Network Higher Harmonic and var compensation energy-saving device, comprise the electric network source of three-phase, load supplying transformer, by electric loading, line voltage current sensing means, high pressure grid-connecting apparatus, electric power compensation converting means, load voltage current sensing means, system protection control device, PWM inverter, DSP-FFT processing unit, wherein load supplying transformer (2), connect respectively in electrical network by electric loading (1), it is characterized in that: line voltage current sensing means (3) in parallel successively in the electrical network between electric network source with load supplying transformer (2), high pressure grid-connecting apparatus (7), the output of line voltage current sensing means (3) connects the input of measure voltage & current A/D converter (4), the output of measure voltage & current A/D converter (4) connects a signal input part of DSP-FFT processing unit (5), a signal output part of signal input part connected system protecting control device (6) of high pressure grid-connecting apparatus (7), a signal input part of system protection control device (6) connects first signal output part of DSP-FFT processing unit (5), first electric power transfer line end of high pressure grid-connecting apparatus (7) is bi-directionally connected the first electric power transfer line end of electric power compensation converting means (9), second electric power transfer line end of high pressure grid-connecting apparatus (7) is bi-directionally connected the second electric power transfer line end of electric power compensation converting means (9), another signal output part of system protection control device (6) connects the signal input part of electric power compensation converting means (9), the another signal output part of system protection control device (6) connects a signal input part of PWM inverter (8), 3rd electric power transfer line end of electric power compensation converting means (9) is bi-directionally connected the first electric power transfer line end of PWM inverter (8), 4th electric power transfer line end of electric power compensation converting means (9) is bi-directionally connected the second electric power transfer line end of PWM inverter (8), another signal input part of PWM inverter (8) connects the secondary signal output of DSP-FFT processing unit (5), another signal input part of DSP-FFT processing unit (5) connects the signal output part of A/D converter (11), the signal input part of A/D converter (11) connects the signal output part of load voltage current sensing means (10), the signal input part of load voltage current sensing means (10) also links load supplying transformer (2) and with the electric power transfer bus between electric loading, DSP-FFT processing unit (5) controls line voltage current sensing means (3) and measure voltage & current A/D converter (4), high order harmonic component in electrical network and var and power network fluctuation impact conditions are detected, calculate and fast Fourier transform fft analysis, calculate the controling parameters of PWM inverter (8) and electric power compensation converting means (9), control PWM inverter (8) by DSP-FFT processing unit (5), with electric power compensation converting means (9), the high order harmonic component in electrical network and var are carried out absorption energy storage, inversion, phase shift is and electrical network same frequency, synchronous active power is transmitted back to electrical network again, simultaneously, when electrical network or electric power compensation converting means (9) break down, control signal is sent to high pressure grid-connecting apparatus (7) by DSP-FFT processing unit (5) control system protecting control device (6), high pressure grid-connecting apparatus (7) is made to cut off electrical network, simultaneity factor protecting control device (6) sends control signal to the signal input part of PWM inverter (8) with electric power compensation converting means (9), close PWM inverter (8) and electric power compensation converting means (9), thus protection electric power compensation converting means (9) and electrical network.
2. a kind of active Electric Network Higher Harmonic as claimed in claim 1 and var compensation energy-saving device, is characterized in that: the 3rd signal output part connecting fluid crystal display screen (12) of described DSP-FFT processing unit (5).
3. a kind of active Electric Network Higher Harmonic as claimed in claim 1 and var compensation energy-saving device, it is characterized in that: described DSP-FFT processing unit (5) is also provided with some communication interfaces (13), some communication interfaces (13) connect warning device and/or host computer.
4. a kind of active Electric Network Higher Harmonic as claimed in claim 1 and var compensation energy-saving device, it is characterized in that: described electric power compensation converting means (9) comprises harmonic wave filter compensation device (9-1) and power-converting device (9-2), described high pressure grid-connecting apparatus (7) comprises high pressure grid-connection control device (7-1), high pressure network regulation sensor (7-2), the grid-connected voltage regulator of high pressure (7-3), first electric power transfer line end of harmonic wave filter compensation device (9-1) adopts bi-directional bus to connect high pressure respectively and the first electric power transfer line end of the first electric power transfer line end of network regulation sensor (7-2) and the grid-connected voltage regulator of high pressure (7-3), first electric power transfer line end of PWM inverter (8) is bi-directionally connected the another electric power transfer line end of harmonic wave filter compensation device (9-1), second electric power transfer line end of PWM inverter (8) is bi-directionally connected an electric power transfer line end of power-converting device (9-2), and another electric power transfer line end of power-converting device (9-2) adopts bi-directional bus to connect high pressure respectively and another electric power transfer line end of another electric power transfer line end of network regulation sensor (7-2) and the grid-connected voltage regulator of high pressure (7-3), high pressure another electric power transfer line end of network regulation sensor (7-2) are bi-directionally connected an electric power transfer line end of high pressure grid-connection control device (7-1), another electric power transfer line end of the grid-connected voltage regulator of high pressure (7-3) is bi-directionally connected another electric power transfer line end of high pressure grid-connection control device (7-1), a signal output part of signal input part connected system protecting control device (6) of high pressure grid-connection control device (7-1).
5. a kind of active Electric Network Higher Harmonic as claimed in claim 4 and var compensation energy-saving device; it is characterized in that: described system protection control device (6) exports and controls high pressure grid-connection control device (7-1), and high pressure grid-connection control device (7-1) adopts high-voltage switch gear.
6. a kind of active Electric Network Higher Harmonic as claimed in claim 4 and var compensation energy-saving device, it is characterized in that: DSP-FFT processing unit (5) controls PWM inverter (8) drived control harmonic filtering installation (9-1), the higher harmonic voltage that electrical network produces is compensated.
7. a kind of active Electric Network Higher Harmonic as claimed in claim 4 and var compensation energy-saving device, is characterized in that: dsp processor in DSP-FFT processing unit (5) controls PWM inverter (8) to be carried out drived control power-converting device (9-2) and the high order harmonic component in electrical network and var are carried out absorption rectification energy storage, inversion, phase shift, is converted to and is transmitted back to electrical network again with electrical network same frequency, synchronous active power.
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| CN107370152A (en) * | 2017-06-21 | 2017-11-21 | 上海广吉电气有限公司 | Railway electric car intelligence active filter |
| CN107240919A (en) * | 2017-06-21 | 2017-10-10 | 上海广吉电气有限公司 | Intelligent active filter |
| CN107294109A (en) * | 2017-06-21 | 2017-10-24 | 上海广吉电气有限公司 | Smelting iron and steel intelligent grid energy-saving compensated system |
| CN107452260A (en) * | 2017-08-14 | 2017-12-08 | 南京理工大学 | A kind of SVG working principle demonstration instruments |
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| CN117096877B (en) * | 2023-10-19 | 2024-02-13 | 国网山西省电力公司营销服务中心 | Multi-view-based regional dynamic electricity-carbon data electricity analysis method and system |
| CN117691600A (en) * | 2024-02-01 | 2024-03-12 | 北京特克曼电气科技有限公司 | Harmonic voltage management device, control method, system, equipment and medium |
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| JP2712388B2 (en) * | 1988-10-04 | 1998-02-10 | 日新電機株式会社 | Reactive power compensator |
| JPH04273504A (en) * | 1991-02-28 | 1992-09-29 | Mitsubishi Electric Corp | Instantaneous reactive power compensator |
| CN101183791B (en) * | 2007-12-19 | 2012-01-11 | 湖南大学 | Static reactive compensator and active power filter combined operation system and control method thereof |
| CN201805234U (en) * | 2010-09-01 | 2011-04-20 | 湖南大学 | Comprehensive voltage reactive power control system with harmonic suppression function |
| CN101976954A (en) * | 2010-09-30 | 2011-02-16 | 中国矿业大学 | Frequency converter and method for eliminating harmonic and compensating reactive power |
| CN102324745B (en) * | 2011-09-20 | 2013-12-04 | 山西合创电力科技有限公司 | Control device of hybrid type active power dynamic filter in intelligent power grid |
| CN202309076U (en) * | 2011-11-01 | 2012-07-04 | 马爱刚 | Hybrid filtering microcomputer intelligent control motor power-saving device |
| CN103199530B (en) * | 2012-01-05 | 2016-07-06 | 上海韦欧韦滤波设备有限公司 | There is the energy-saving and cost-reducing active filter administering harmonic wave method |
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