CN103545812A - 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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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.Because tap a new source of energy, still needing and want time, is the task of top priority of the current world and save the existing energy.It is the maximum field of world's power consumption that current ferrous metal is smelted with electrolytic aluminum smelting, so energy-saving and emission-reduction are worked as from metal smelt field head when doing.China's Ferrous Metallurgy field is to utilize coreless induction furnace and arc furnace etc. to carry out arc-melting and electrolysis pyrolytic semlting production.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, while being fused into molten iron and aluminium liquid status, between electrode, be similar to short-circuit condition, two kinds of operating state load currents are correlated with tens times, line voltage and electric current are caused significantly to float, electrical network is caused to great impact, produce a large amount of high order harmonic components and var, make electrical network and electric power system produce fluctuation greatly, electrical network is caused to serious interference and pollution, serious impact the power supply quality of 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 are low, are 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 utility model patent that the patent No. is 201220183143 at present, a kind of active power filter is disclosed, it comprises: real-time detection circuit, by the electric current to load, detect in real time, obtain load current waveform, according to the analysis result of real-time detection circuit, thereby obtain the harmonic current composition that needs compensation; The payment of control and compensation circuit to harmonic current; The harmonic current composition of needs compensation is reverse, by IGBT inverter, reverse current is injected to electric power system; Realize the humorous wave energy of filtering.But which compensation precision is low, poor reliability.
The utility model patent that the patent No. is 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 partly comprises active filter and the passive filter of series connection, described active filter can not bear the fundamental voltage in grid alternating current source, withstand voltage low, 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, with this, realize the active electrical network energy-saving compensated system of high-tension high-power intelligence.
For achieving the above object, design a kind of active Electric Network Higher Harmonic and var compensation energy-saving device, the electric network source that comprises 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, by electric loading 1, connect respectively in electrical network, it is characterized in that: line voltage current sensing means 3 in parallel successively in the electrical network between power supply and load supplying transformer 2, high pressure grid-connecting apparatus 7, the output of line voltage current sensing means 3 connects the input that electric current and voltage detects A/D converter 4, electric current and voltage detects a signal input part of the output connection DSP-FFT processing unit 5 of A/D converter 4, a signal output part of a signal input part connected system protection 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 of DSP-FFT processing unit 5, the first electric power transfer line end of the two-way connection electric power compensation of the first electric power transfer line end converting means 9 of high pressure grid-connecting apparatus 7, the second electric power transfer line end of the two-way connection electric power compensation of the second electric power transfer line end converting means 9 of high pressure grid-connecting apparatus 7, 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, the first electric power transfer line end of the two-way connection PWM of the 3rd electric power transfer line end inverter 8 of electric power compensation converting means 9, the second electric power transfer line end of the two-way connection PWM of the 4th electric power transfer line end inverter 8 of electric power compensation converting means 9, 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 is also linked load supplying transformer 2 and with the electric power transfer bus between electric loading, DSP-FFT processing unit 5 is controlled line voltage current sensing means 3 and is detected A/D converter 4 with electric current and voltage, to the high order harmonic component in electrical network and var and power network fluctuation impact conditions detects, calculating and fft analysis, calculate the control parameter of PWM inverter 8 and electric power compensation converting means 9, by DSP-FFT processing unit 5, control PWM inverter 8, with electric power compensation converting means 9, the high order harmonic component in electrical network and var are absorbed to energy storage, inversion, phase shift for to be transmitted back to electrical network with electrical network same frequency, synchronous meritorious electric power again, simultaneously, when electrical network or electric power compensation converting means 9 break down, by DSP-FFT processing unit 5 control system protection control device 6, send control signal to high pressure grid-connecting apparatus 7, make high pressure grid-connecting apparatus 7 cut off electrical network, simultaneity factor protection control device 6 sends control signal to the signal end of PWN inverter 8 and 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.
The 3rd signal output part connecting fluid crystal display screen 12 of described DSP-FFT processing unit 5.
On described DSP-FFT processing unit 5, be also provided with some communication interfaces 13, 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, the 3rd electric power transfer line end of the two-way connection harmonic wave filter compensation of the first electric power transfer line end device 9-1 of PWM inverter 8, the first electric power transfer line end of harmonic wave filter compensation device 9-1 adopts bi-directional bus to connect respectively the first electric power transfer line end of high pressure network regulation sensor 7-2 and the first electric power transfer line end of the grid-connected voltage regulator 7-3 of high pressure, an electric power transfer line end of the two-way connection power-converting device of the second electric power transfer line end 9-2 of PWM inverter 8, another electric power transfer line end of power-converting device 9-2 adopts bi-directional bus to connect respectively another electric power transfer line end of high pressure network regulation sensor 7-2 and another electric power transfer line end of the grid-connected voltage regulator 7-3 of high pressure, an electric power transfer line end of the two-way connection high pressure of another electric power transfer line end grid-connection control device 7-1 of high pressure network regulation sensor 7-2, another electric power transfer line end of the two-way connection high pressure of another electric power transfer line end grid-connection control device 7-1 of the grid-connected voltage regulator 7-3 of high pressure, a signal output part of the signal input part connected system protection control device 6 of high pressure grid-connection control device 7-1.
High pressure grid-connection control device 7-1 is controlled in described system protection control device 6 outputs, presses grid-connection control device 7-1 to adopt high-voltage switch gear.
Described DSP-FFT processing unit 5 is controlled PWM inverter 8 and is driven control harmonic filtering installation 9-1, and the higher harmonic voltage that electrical network is produced compensates.
It is the meritorious electric power with line voltage same-phase same frequency the var phase shift in electrical network that dsp processor control PWM inverter 8 in described DSP-FFT processing unit 5 drives control harmonic filtering installation 9-1 and power-converting device 9-2.
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 and disturbs, and improves grid stability and fail safe; High order harmonic component and var are converted to meritorious electric 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 compensation, reduce transformer noise and temperature, can increase substantially equipment life and dielectric strength, increase transformer transmission and bearer cap, increase carrying load ability, reduced that transformer wastes and line loss, greatly improved the capacity of transformer and transmission facility, increased 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 changes for load, adopt after the compensation of this compensation arrangement, 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
Referring to 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 that is embedded with fft analysis algorithm, load supplying transformer 2, by electric loading 1, connect respectively in electrical network, it is characterized in that: line voltage current sensing means 3 in parallel successively in the electrical network between power supply and load supplying transformer 2, high pressure grid-connecting apparatus 7, the output of line voltage current sensing means 3 connects the input that electric current and voltage detects A/D converter 4, electric current and voltage detects a signal input part of the output connection DSP-FFT processing unit 5 of A/D converter 4, a signal output part of a signal input part connected system protection 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 of DSP-FFT processing unit 5, the first electric power transfer line end of the two-way connection electric power compensation of the first electric power transfer line end converting means 9 of high pressure grid-connecting apparatus 7, the second electric power transfer line end of the two-way connection electric power compensation of the second electric power transfer line end converting means 9 of high pressure grid-connecting apparatus 7, 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, the first electric power transfer line end of the two-way connection PWM of the 3rd electric power transfer line end inverter 8 of electric power compensation converting means 9, the second electric power transfer line end of the two-way connection PWM of the 4th electric power transfer line end inverter 8 of electric power compensation converting means 9, 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 is also linked 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 in this example, by electric loading, mainly comprise 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.
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, the 3rd electric power transfer line end of the two-way connection harmonic wave filter compensation of the first electric power transfer line end device 9-1 of PWM inverter 8, the first electric power transfer line end of harmonic wave filter compensation device 9-1 adopts bi-directional bus to connect respectively the first electric power transfer line end of high pressure network regulation sensor 7-2 and the first electric power transfer line end of the grid-connected voltage regulator 7-3 of high pressure, an electric power transfer line end of the two-way connection power-converting device of the second electric power transfer line end 9-2 of PWM inverter 8, another electric power transfer line end of power-converting device 9-2 adopts bi-directional bus to connect respectively another electric power transfer line end of high pressure network regulation sensor 7-2 and another electric power transfer line end of the grid-connected voltage regulator 7-3 of high pressure, an electric power transfer line end of the two-way connection high pressure of another electric power transfer line end grid-connection control device 7-1 of high pressure network regulation sensor 7-2, another electric power transfer line end of the two-way connection high pressure of another electric power transfer line end grid-connection control device 7-1 of the grid-connected voltage regulator 7-3 of high pressure, a signal output part of the signal input part connected system protection control device 6 of high pressure grid-connection control device 7-1.
High pressure grid-connection control device 7-1 is controlled in described system protection control device 6 outputs, presses grid-connection control device 7-1 to adopt high-voltage switch gear.
The 3rd signal output part of described DSP-FFT processing unit 5 connects display screen 12, can adopt here liquid crystal display be used for showing in real time electric current, voltage, power, reactive power, the power factor of the current transformer by electric loading 1, each higher harmonic content, by load current, the voltage condition of electric loading 1.
On described DSP-FFT processing unit 5, be also provided with some communication interfaces 13, 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 control.Wherein, mainly by DSP-FFT processing unit 5, control line voltage current sensing means 3, electric current and voltage detects A/D converter 4, A/D converter 11, warning device can also form fault detect control and warning system, in 5 pairs of electrical networks of DSP-FFT processing unit, transient signal is analyzed and is inferred prediction, to electrical network, load and electric power compensation converting means 9 operating states are forecast, control and report to the police, simultaneously to electrical network, load and benefit electric power compensation converting means 9 send protection control command, in avoiding fault to occur in early days, to electrical network, load and compensation arrangement are protected operation.For the purpose of the present invention, network system is sent to early warning signal and operation execution instruction, 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.When electrical network breaks down, do not affect like this compensation arrangement, when compensation arrangement breaks down, do not affect operation of power networks.
Control principle of the present invention:
This bucking-out system by DSP-FFT processing unit 5 for load dynamic change state and electrical network bus high order harmonic component and var detects and constituent analysis, with this, carry out regulating and controlling electric power compensation converting means 9, electrical network each harmonic is compensated, its harmonic wave filter compensation device 9-1 is regulated all the time and be operated in resonance condition, the impedance of harmonic wave filter compensation device 9-1 is zero for the relative impedance 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 voltages, therefore obtains high-precision compensation effect.
The present invention is because the bucking voltage of PWM inverter 8 outputs is the interior resistance drops for 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 process the detection of higher harmonic voltage in electrical network and fft analysis, and line voltage current signal is detected, calculate and analyze, and electrical network variable condition is predicted and inferred, calculate the variable quantity of next 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 that phase place is adjustable, Electric Network Higher Harmonic and var are compensated, control power-converting device 9-2 simultaneously high order harmonic component electric power and var are transformed to meritorious electric power loopback electrical network, produce efficient energy-saving effect.
Referring to Fig. 1, the present invention utilizes DSP-FFT processing unit 5 to control line voltage current sensing means 3 and detects A/D converter 4 with electric current and voltage, the high order harmonic component producing by electric loading 1 and var and power network fluctuation impact conditions are detected, calculate and fft analysis, calculate PWM inverter 8 and control parameter with electric power compensation converting means 9, DSP-FFT processing unit 5 is controlled PWM inverter 8 and electric power compensation converting means 9, to the harmonic wave in electrical network and var compensation, harmonic wave and var are converted to meritorious electric 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, reducing electrical network disturbs, 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, by high pressure grid-connecting apparatus 7, drop into electrical network, 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, by DSP-FFT processing unit 5, control PWM inverter 8 simultaneously, with power-converting device 9-2, high order harmonic component in electrical network and var are absorbed to energy storage, inversion, phase shift for to be transmitted back to electrical network with electrical network same frequency, synchronous meritorious electric power, play high efficiency energy-saving effect.High order harmonic component and the var compensate function thus with high-speed, high precision, and harmonic wave and var are transformed to meritorious electric power loopback electrical network, voltage ripple of power network is had to the function that suppresses compensation and system protection simultaneously.
Referring to 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 and flow in its rectifier via harmonic wave filter compensation device 9-1, high order harmonic component and var are carried out to the power supply that rectification is re-used as harmonic wave filter compensation device 9-1 and electric power converter device 9-2, by power-converting device 9-2 inversion, be the meritorious electric power loopback electrical network of 50HZ, save a large amount of electric power.By harmonic wave filter compensation device 9-1, produce the bucking voltage contrary with Electric Network Higher Harmonic voltage simultaneously and input electrical network by compensation arrangement, the high order harmonic component not absorbed is compensated, produce high-precision compensation effect.
Voltage and electric current that the present invention adopts DSP-FFT processing unit 5 to control in line voltage current sensing means 3 and 4 pairs of electrical networks of electric current and voltage detection A/D converter detect, and by the voltage detecting, 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, by dsp controller, control PWM inverter 8 and electric power compensation converting means 9, harmonic wave filter compensation device 9-1 by electric power compensation converting means 9 produces bucking voltage, power-converting device 9-2 by electric power compensation converting means 9 is converted to meritorious electric power high order harmonic component and var simultaneously.Harmonic wave filter compensation device 9-1 and power-converting device 9-2 are 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 and adopt the high order harmonic component of 5 pairs of electric power systems of DSP-FFT processing unit and the composition of var to detect and analyze, utilization also calculates amplitude, frequency and the phase place of each high order harmonic component and var fast.
2. by DSP-FFT processing unit 5, control PWM inverters 8 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. by DSP-FFT processing unit 5, control PWM inverter 8 and electric power compensation converting means 9, Electric Network Higher Harmonic and var are converted to meritorious electric power via high pressure grid-connecting apparatus 7 loopback electrical networks, save a large amount of electric energy.
4. utilize current/voltage and the power factor of 5 pairs of electrical networks of DSP-FFT processing unit and electric power system to detect and accident analysis.By system protection control device 6, carry out system overvoltage, overcurrent, overload and system failure defencive function.
5. because the present invention is to high order harmonic component and var high-accuracy compensation, and the rush of current in arc furnace production process, load variations being caused and system voltage are suppressed, eliminate electric power system impact and voltage fluctuation, improved 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 in real time electric current, voltage, power, reactive power, the power factor of arc furnace transformer, each higher harmonic content, arc furnace transformer load condition, electric furnace transformer-supplied system state change.
Steel mill's electric arc furnace smelting system adopts after the present invention, and to Monitoring Data interpretation of result, compensation principle of the present invention and energy-saving effect are 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 with voltage fluctuation and is controlled effectively, and improves stability and the fail safe of electric power system, and power grid quality is greatly improved.After compensation, average higher harmonic content drops to below 1%, and power factor reaches more than 0.95～0.99.After compensation, reach country and more than international standard.
2. after adopting the present invention to compensate, high order harmonic component and var are converted to meritorious electric power loopback electrical network, obtain efficient energy-saving effect, ton steel " active energy " economize on electricity reaches 36.012 degree, more than " capacity of idle power " economize on electricity reaches 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 electric arc effective stable with furnace temperature, and average every stove shortens 15 minutes the duration of heat～and by 21 minutes, average blowing oxygen quantity saved 7.6%, and average steel power consumption per ton reduces more than 5%～18%.
4. through same material close steel-making heat (batch) number tap identical with feeding quantity contrasted, arc furnace draws that arc efficiency is good, furnace temperature is stable, make every stove have more 1.53 tons of steel～2.86 ton steel of steel, ton steel power consumption is further reduced, the total cost that makes to make steel significantly lowers.
5. because high order harmonic component and var reduce greatly, so noise vibration and the temperature of arc furnace supply transformer are significantly declined, transformer temperature drops to 45.2 degree by 54.8 degree, transformer mean temperature decline 8.5 degree～11.3 degree, can increase substantially equipment life and dielectric strength, 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, with electric loading power consumption, significantly declines.
7. reduce the frequent input of arc furnace and cut out the impact to electrical network, reducing transformer and electric equipment impact sound and vibrations, reducing line voltage and float, improving stability and the fail safe of electrical network.
8. the invention belongs to source filtering compensation system, compare with passive filter, segmentation switching filters, SVG, SVC, electric energy of the present invention is high, and compensation precision is high, speed is fast, volume is little, stability and safe.
In sum, this device drops into the high order harmonic component and the var that after network system, electric power system are produced and compensates, high order harmonic component and var are converted to meritorious electric power loopback electrical network, obtain efficient energy-saving effect, effectively suppress smelting arc furnace, coreless induction furnace, the system loadings such as rolling mill change the power network current causing and impact interference and the harm of floating electrical network is caused with line voltage, reduce transformer and electric power system noise and vibrations, the temperature of reduction equipment, improve transformer and power consumption equipment bringing onto load capacity, stability and the fail safe of electric power system have been improved, energy-saving and emission-reduction, resultant effect is remarkable.The present invention is rational in infrastructure, runnability is stable, there is large capacity dynamically to follow the tracks of accurately compensation control characteristic, speed is fast, energy-saving efficiency is high, output voltage high power is large, the various varying loadings of electric power system are had to good adaptability, compensation is short transit time, more than the several times of compensation ability of other types active filter, can be for the following various smelting electrical networks of 110KV and power supply network and electric power system, being convenient to assembling safeguards, the invention belongs to voltage compensation type self-adapting intelligent numeral 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 loads 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, solved the existing problem of existing all kinds of filter.
Claims (7)
1. an active Electric Network Higher Harmonic and var compensation energy-saving device, the electric network source that comprises 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, load supplying transformer (2) wherein, by electric loading (1), connect respectively in electrical network, it is characterized in that: line voltage current sensing means in parallel (3) successively in the electrical network between power supply and load supplying transformer (2), high pressure grid-connecting apparatus (7), the output of line voltage current sensing means (3) connects the input that electric current and voltage detects A/D converter (4), electric current and voltage detects a signal input part of the output connection DSP-FFT processing unit (5) of A/D converter (4), a signal output part of a signal input part connected system protection 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 of DSP-FFT processing unit (5), the first electric power transfer line end of the first electric power transfer line end two-way connection electric power compensation converting means (9) of high pressure grid-connecting apparatus (7), the second electric power transfer line end of the second electric power transfer line end two-way connection electric power compensation converting means (9) of high pressure grid-connecting apparatus (7), 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, the first electric power transfer line end of the 3rd electric power transfer line end two-way connection PWM inverter (8) of electric power compensation converting means (9), the second electric power transfer line end of the 4th electric power transfer line end two-way connection PWM inverter (8) of electric power compensation converting means (9), 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) is also linked load supplying transformer (2) and with the electric power transfer bus between electric loading, DSP-FFT processing unit (5) is controlled line voltage current sensing means (3) and is detected A/D converter (4) with electric current and voltage, high order harmonic component in electrical network and var and power network fluctuation impact conditions are detected, calculate and fft analysis, calculate the control parameter of PWM inverter (8) and electric power compensation converting means (9), by DSP-FFT processing unit (5), control PWM inverter (8), with electric power compensation converting means (9), the high order harmonic component in electrical network and var are absorbed to energy storage, inversion, phase shift is and electrical network same frequency, synchronous meritorious electric power is transmitted back to electrical network again, simultaneously, when electrical network or electric power compensation converting means (9) break down, by DSP-FFT processing unit (5) control system protection control device (6), send control signal to high pressure grid-connecting apparatus (7), make high pressure grid-connecting apparatus (7) cut off electrical network, simultaneity factor protection control device (6) sends control signal to the signal end of PWN inverter (8) and 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.
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: on described DSP-FFT processing unit (5), be 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), the 3rd electric power transfer line end of the first electric power transfer line end two-way connection harmonic wave filter compensation device (9-1) of PWM inverter (8), the first electric power transfer line end of harmonic wave filter compensation device (9-1) adopts bi-directional bus to connect respectively the first electric power transfer line end of high pressure network regulation sensor (7-2) and the first electric power transfer line end of the grid-connected voltage regulator of high pressure (7-3), an electric power transfer line end of the second two-way connection power-converting device of electric power transfer line end (9-2) of PWM inverter (8), another electric power transfer line end of power-converting device (9-2) adopts bi-directional bus to connect respectively another electric power transfer line end of high pressure network regulation sensor (7-2) and another electric power transfer line end of the grid-connected voltage regulator of high pressure (7-3), an electric power transfer line end of another electric power transfer line end two-way connection high pressure grid-connection control device (7-1) of high pressure network regulation sensor (7-2), another electric power transfer line end of another electric power transfer line end two-way connection high pressure grid-connection control device (7-1) of the grid-connected voltage regulator of high pressure (7-3), a signal output part of the signal input part connected system protection 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 1 and var compensation energy-saving device; it is characterized in that: high pressure grid-connection control device (7-1) is controlled in described system protection control device (6) output, presses grid-connection control device (7-1) to adopt high-voltage switch gear.
6. a kind of active Electric Network Higher Harmonic as claimed in claim 1 and var compensation energy-saving device, it is characterized in that: DSP-FFT processing unit (5) is controlled PWM inverter (8) and driven control harmonic filtering installation (9-1), and the higher harmonic voltage that electrical network is produced compensates.
7. a kind of active Electric Network Higher Harmonic as claimed in claim 1 and var compensation energy-saving device, is characterized in that: the dsp processor in DSP-FFT processing unit (5) is controlled PWM inverter (8) and driven and control power-converting device (9-2) high order harmonic component in electrical network and var are absorbed to rectification energy storage, inversion, phase shift, are converted to electrical network same frequency, synchronous meritorious electric power and are transmitted back to electrical network again.
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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 |
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| CN114156071B (en) * | 2021-11-29 | 2024-01-19 | 国网福建省电力有限公司 | Active noise reduction method and device for vibration reduction and noise reduction of urban distribution transformer |
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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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