CN112994006A - Intelligent public transformer energy-saving comprehensive treatment device - Google Patents
Intelligent public transformer energy-saving comprehensive treatment device Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- 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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- 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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- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses an intelligent public transformer energy-saving comprehensive treatment device, and particularly relates to the technical field of intelligent public transformers, wherein the technical scheme is as follows: the intelligent power supply comprises a public transformer, wherein a wire outlet end of the public transformer is connected with a four-quadrant inverter, the four-quadrant inverter is connected with a passive filter, the passive filter is connected with a circuit breaker, the circuit breaker is connected with a filter reactor and a filter capacitor, the filter reactor is connected with the filter capacitor, the circuit breaker, the filter reactor and the filter capacitor are connected with an IGBT module, the IGBT module is connected with an intelligent controller through a three-phase bridge connection wire, and the IGBT module is connected with a direct current capacitor, and the intelligent power supply has the beneficial effects that: the harmonic pollution of a common transformer 400V system is solved, the long-standing problem that the failure rate of common household appliances is high and the problem that the loss of a power supply line is increased due to harmonic waves are solved, and the harmonic pollution control method has great social benefits.
Description
Technical Field
The invention relates to the field of intelligent public transformers, in particular to an intelligent public transformer energy-saving comprehensive treatment device.
Background
The transformer is a device for changing alternating voltage by utilizing the principle of electromagnetic induction, main components are a primary coil, a secondary coil and an iron core, and the transformer has the following main functions: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization, and the like.
The prior art has the following defects: the existing public transformer is equipment for directly supplying power to the homes of people, has a wide range and a large amount, is directly related to the vital interests of the people, has no good treatment method for the electric energy quality and the power supply line loss of the public transformer all the time, has long public transformer power supply line and higher voltage deviation, simultaneously has more and more serious harmonic pollution of a public transformer network due to the popularization and the promotion of electronic devices of the current household appliances, has continuously increased fault rate of the household appliances of the people, particularly has high fault rate of refrigerators and lighting lamps, and has high power supply line loss caused by unbalanced three phases because the household appliances are mostly single-phase power.
Therefore, the invention is necessary to invent an intelligent public energy-saving comprehensive treatment device.
Disclosure of Invention
Therefore, the invention provides an intelligent public-transformer energy-saving comprehensive treatment device, which is used for carrying out comprehensive treatment by adopting a method of combining a four-quadrant inverter with a passive filter and combining the passive filter with an intelligent controller, so as to solve the problems that harmonic pollution is more and more serious, the failure rate of household appliances of common people is continuously increased, and the power supply line loss is caused by three-phase imbalance.
In order to achieve the above purpose, the invention provides the following technical scheme: the utility model provides an intelligent public energy-conserving comprehensive control device of becoming, includes public transformer, four-quadrant inverter is connected to public transformer leading-out terminal, four-quadrant inverter connects passive filter, passive filter connects the circuit breaker, filter reactor and filter capacitor are connected to the circuit breaker, filter reactor connects filter capacitor, the circuit breaker filter reactor with filter capacitor connects the IGBT module, the IGBT module passes through three-phase bridge type wiring and connects intelligent control ware, DC capacitor is connected to the IGBT module.
Preferably, the intelligent controller is composed of a sampling part, a CPU main control board and an output part.
Preferably, the sampling portion is provided in a three-phase four-wire system.
Preferably, the method also comprises a using method, and the specific steps are as follows:
s1, firstly, connecting a V outlet end on a public transformer with a four-quadrant inverter, then connecting the four-quadrant inverter with a passive filter, wherein after connection, the passive filter can be used for absorbing harmonic components, and the four-quadrant inverter can detect voltage and current and respectively control the phase of the current and the voltage, so that the three-phase voltage is stable, the three-phase current is balanced, and the power factor is kept at the same time, thereby achieving the purposes of reducing the fault rate of common household appliances, reducing the power consumption and reducing the power line loss;
s2, connecting the IGBT module with the intelligent controller through a three-phase bridge connection wire, so as to achieve split-phase control, and realize three single-phase four-quadrant inversion power units, namely the intelligent controller has the functions of both a motor and a generator, and respectively controls the phase current of each phase so as to balance the three-phase current;
s3, according to the voltage amplitude, the current phase angle is adjusted to send out inductive reactive power when the voltage is higher, reduce the voltage at the outlet of the public transformer, and output capacitive reactive power when the voltage is lower, to perform stepless voltage compensation on the power supply line to achieve the voltage stabilization effect, and meanwhile, the power factor can be conveniently adjusted by controlling the current voltage phase, so as to reduce the redundant loss caused by reactive current on the line;
s4, when the load of the public transformer is detected to be unbalanced, the intelligent controller detects and calculates that the phase with small current runs in the I quadrant, the power unit is in rectification charging to increase the phase current, the phase with large current runs in the III quadrant, the power unit is in inversion power generation to reduce the phase current to enable the phase current to reach three-phase balance, and the harmonic wave absorbs the system harmonic wave through the passive filter, so that the electric energy quality is improved, the faults of household appliances of the old people are reduced, and the line accessory loss caused by the harmonic wave is reduced.
Preferably, in S4, the intelligent controller detection calculation formula is:
by the sampling part, respectively: ia. Ib and Ic current amplitude and the phase differences theta a, theta b and theta c of the Ua, Ub and Uc voltage amplitude and the current voltage;
firstly, calculating the active component and the reactive component of the single-phase current according to the single-phase current:
the active components are as follows:
Iap＝Ia*cosθa；
Ibp＝Ib*cosθb；
Icp＝Ic*cosθc；
the reactive current components are:
Iaq＝Ia*sinθa；
Ibq＝Ib*sinθb；
Icq＝Ic*sinθc；
and then calculating the average value of the three-phase active current:
I＝(Iap+Ibp+Icp)/3；
calculating the active current compensation value of each phase:
ia' ═ I-Iap ═ Iap + Ibp + Icp)/3-Iap (-No. is in a power generation state, + is in a rectification state);
ib' ═ I-Ibp ═ (Iap + Ibp + Icp)/3-Ibp (-No. is power generation state, + is rectification state);
ic ═ I-Icp ═ (Iap + Ibp + Icp)/3-Icp (-No. is power generation state, + is rectification state);
calculating a three-phase voltage compensation value:
let the common transformer impedance be X1 and the line impedance be X2, manually entered by man-machine dialog:
then: Δ Ua ═ Un-Ua (+ output capacitive reactive-sign output inductive reactive);
Δ Ub ═ Un-Ub (+ output capacitive reactive-sign output inductive reactive);
Δ Uc ═ Un-Uc (+ output capacitive reactive-sign output inductive reactive);
the reactive power required to compensate the voltage is then:
Δ Qa ═ (Ia' + Iap)2 × (X1+ X2) (+ output capacitive reactive-sign output inductive reactive);
Δ Qb ═ (Ib' + Ibp)2 × (X1+ X2) (+ output capacitive reactive-signal output inductive reactive);
Δ Qc ═ Ic' + Icp)2 × (X1+ X2) (+ output capacitive reactive-sign output inductive reactive);
the voltage-compensated reactive current is:
△Iaq＝△Qa/Un；
△Ibq＝△Qb/Un；
△Icq＝△Qc/Un；
according to the calculation result, the output current of each phase of the intelligent controller is obtained as follows:
phase a output current ═ ((Iap + Ibp + Icp)/3-Iap) + j (Ia X sin θ a + (Iap + Ibp + Icp)/3)2 × (X1+ X2));
phase B output current ═ ((Iap + Ibp + Icp)/3-Ibp) + j (Ib × sin θ B + (Iap + Ibp + Icp)/3)2 × (X1+ X2));
the phase C output current ═ ((Iap + Ibp + Icp)/3-Icp) + j (Ia X sin θ C + (Iap + Ibp + Icp)/3)2 × (X1+ X2));
the phase angle of the output current is:
Θa＝ACOS(Ia‘/(Ia‘+j(Iaq+△Iaq)))；
Θb＝ACOS(Ib‘/(Ib‘+j(Ibq+△Ibq)))；
Θc＝ACOS(Ic‘/(Ic‘+j(Icq+△Icq)))；
therefore, the current amplitude can be calculated according to the intelligent controller to determine the modulation pulse width and the phase relation between the current and the voltage, so that three functions of solving three-phase unbalance, power factor compensation and line voltage drop compensation by the intelligent controller can be achieved.
The invention has the beneficial effects that:
1. the harmonic pollution of a common transformer 400V system is solved, the long-standing problem that the failure rate of common people household appliances is high and the problem that the loss of a power supply line is increased due to harmonic waves are solved, and the social benefit is great;
2. the voltage stabilizing function is realized, the electricity consumption is reduced when the household voltage of common people is high, and the energy-saving and burden-reducing functions are realized;
3. the three-phase unbalance state of the power supply network is solved, the negative sequence component is reduced, and the line loss is reduced;
4. the reactive power demand can be adjusted in a stepless manner, the power factor is ensured to reach the standard, and the additional line loss caused by the reactive power in the network is reduced.
Drawings
Fig. 1 is a schematic structural diagram provided by the present invention.
In the figure: the intelligent power supply comprises a public transformer 100, a four-quadrant inverter device 200, a passive filter 300, a circuit breaker 400, a filter reactor 500, a filter capacitor 600, an IGBT module 700, a direct current capacitor 800 and an intelligent controller 900.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Referring to fig. 1, the intelligent public transformer energy-saving comprehensive treatment device provided by the invention comprises a public transformer 100;
further, the outlet end of the utility transformer 100 is connected to a four-quadrant inverter 200, the four-quadrant inverter 200 is connected to a passive filter 300, the passive filter 300 is connected to a circuit breaker 400, the circuit breaker 400 is connected to a filter reactor 500 and a filter capacitor 600, the filter reactor 500 is connected to the filter capacitor 600, the circuit breaker 400, the filter reactor 500 and the filter capacitor 600 are connected to an IGBT module 700, the IGBT module 700 is connected to an intelligent controller 900 through a three-phase bridge connection, the IGBT module 700 is connected to a dc capacitor 800, specifically, the passive filter 300, also called as an LC filter, is a filter circuit formed by a combination design of an inductor, a capacitor and a resistor, and can filter out a certain harmonic or multiple harmonics, and the most commonly and easily adopted passive filter structure is that the inductor is connected in series with the capacitor, and can filter out a major subharmonic 3, a major subharmonic 3, 5. 7 constituting a low impedance bypass, the circuit breaker 400 is a switching device capable of closing, carrying and opening current under normal loop conditions and closing, carrying and opening current under abnormal loop conditions within a specified time, the filter reactor 500 is widely used in a high-low voltage filter cabinet, is connected in series with a filter capacitor, is tuned to a certain resonant frequency, and is used for absorbing harmonic current of corresponding frequency in a power grid, the filter capacitor 600 is an energy storage device installed at two ends of a rectifier circuit for reducing alternating current ripple coefficient and improving high-efficiency smooth direct current output, the filter capacitor has an electric polarity, the IGBT module 700 is a composite fully-controlled voltage-driven power semiconductor device composed of BJTs and MOS, and has the advantages of both high input impedance of MOSFETs and low conduction voltage drop of GTRs, GTRs saturation voltage is reduced, current-carrying density is large, but driving current is large, and MOSFET driving power is small, the direct current capacitor 800 has the advantages of high voltage resistance, high current resistance, low impedance, low inductance, low capacity loss, low leakage current, good temperature performance, high charging and discharging speed, long service life, high safety and explosion-proof stability, convenient non-polar installation and the like.
Further, the intelligent controller 900 is composed of a sampling part, a CPU main control board, and an output part.
Further, the sampling part is set to be a three-phase four-wire system, specifically, the three-phase four-wire system, in a low-voltage distribution network, the transmission line generally adopts the three-phase four-wire system, wherein three lines represent three phases of a, B and C, respectively, and the other line is a neutral line N or PEN.
The using process of the invention is as follows: when the invention is used, the 400V outgoing line end on the public transformer 100 is connected with the four-quadrant inverter device 200, after that, the four-quadrant inverter device 200 is connected with the passive filter 300, after the connection, the passive filter 300 can be used for absorbing harmonic components, and the four-quadrant inverter device 200 can detect voltage and current and respectively control the phases of current and voltage, thereby achieving the purposes of stabilizing three-phase voltage and balancing three-phase current, keeping the power factor always above 0.95, reducing the fault rate of household appliances of the common people, reducing the power consumption and simultaneously reducing the power supply line loss;
the IGBT module 700 is connected with the intelligent controller 900 through a three-phase bridge connection wire, so that split-phase control is achieved, three single-phase four-quadrant inversion power units are achieved, namely the intelligent controller 900 has the functions of a motor and a generator, the magnitude of each phase current is respectively controlled, three-phase current is balanced, according to the voltage amplitude, the current phase angle is adjusted to send inductive reactive power when the voltage is higher, the outlet voltage of the public transformer 100 is reduced, capacitive reactive power can be output when the voltage is lower, stepless voltage compensation is carried out on a power supply line, the voltage stabilization effect is achieved, meanwhile, power factor adjustment can be conveniently carried out through controlling the current voltage phase, redundant loss caused by reactive current on the line is reduced, when the load imbalance of the public transformer 100 is detected, the small-current phase runs in the I quadrant through detection and calculation of the intelligent controller 900, the power unit is in rectification charging, the phase current is increased, the phase with large current runs in a quadrant III, the power unit is in inversion power generation, the phase current is reduced, the three-phase balance is achieved, the harmonic wave absorbs the system harmonic wave through the passive filter 300, the electric energy quality is improved, the faults of household appliances of common people are reduced, and the line accessory loss caused by the harmonic wave is reduced;
the detection calculation formula of the intelligent controller 900 is as follows:
by the sampling part, respectively: ia. Ib and Ic current amplitude and the phase differences theta a, theta b and theta c of the Ua, Ub and Uc voltage amplitude and the current voltage;
firstly, calculating the active component and the reactive component of the single-phase current according to the single-phase current:
the active components are as follows:
Iap＝Ia*cosθa；
Ibp＝Ib*cosθb；
Icp＝Ic*cosθc；
the reactive current components are:
Iaq＝Ia*sinθa；
Ibq＝Ib*sinθb；
Icq＝Ic*sinθc；
and then calculating the average value of the three-phase active current:
I＝(Iap+Ibp+Icp)/3；
calculating the active current compensation value of each phase:
ia' ═ I-Iap ═ Iap + Ibp + Icp)/3-Iap (-No. is in a power generation state, + is in a rectification state);
ib' ═ I-Ibp ═ (Iap + Ibp + Icp)/3-Ibp (-No. is power generation state, + is rectification state);
ic ═ I-Icp ═ (Iap + Ibp + Icp)/3-Icp (-No. is power generation state, + is rectification state);
calculating a three-phase voltage compensation value:
let the impedance of the utility transformer 100 be X1 and the line impedance be X2, and manually input by man-machine interaction:
then: Δ Ua ═ Un-Ua (+ output capacitive reactive-sign output inductive reactive);
Δ Ub ═ Un-Ub (+ output capacitive reactive-sign output inductive reactive);
Δ Uc ═ Un-Uc (+ output capacitive reactive-sign output inductive reactive);
the reactive power required to compensate the voltage is then:
Δ Qa ═ (Ia' + Iap)2 × (X1+ X2) (+ output capacitive reactive-sign output inductive reactive);
Δ Qb ═ (Ib' + Ibp)2 × (X1+ X2) (+ output capacitive reactive-signal output inductive reactive);
Δ Qc ═ Ic' + Icp)2 × (X1+ X2) (+ output capacitive reactive-sign output inductive reactive);
the voltage-compensated reactive current is:
△Iaq＝△Qa/Un；
△Ibq＝△Qb/Un；
△Icq＝△Qc/Un；
according to the above calculation result, the output current of each phase of the intelligent controller 900 is:
phase a output current ═ ((Iap + Ibp + Icp)/3-Iap) + j (Ia X sin θ a + (Iap + Ibp + Icp)/3)2 × (X1+ X2));
phase B output current ═ ((Iap + Ibp + Icp)/3-Ibp) + j (Ib × sin θ B + (Iap + Ibp + Icp)/3)2 × (X1+ X2));
the phase C output current ═ ((Iap + Ibp + Icp)/3-Icp) + j (Ia X sin θ C + (Iap + Ibp + Icp)/3)2 × (X1+ X2));
the phase angle of the output current is:
Θa＝ACOS(Ia‘/(Ia‘+j(Iaq+△Iaq)))；
Θb＝ACOS(Ib‘/(Ib‘+j(Ibq+△Ibq)))；
Θc＝ACOS(Ic‘/(Ic‘+j(Icq+△Icq)))；
therefore, the current amplitude is calculated according to the intelligent controller 900 to determine the modulation pulse width, and the phase relation between the current and the voltage is determined, so that three functions of solving three-phase unbalance, power factor compensation and line voltage drop compensation by the intelligent controller 900 can be achieved.
The above description is only a preferred embodiment of the present invention, and any person skilled in the art may modify the present invention or modify it into an equivalent technical solution by using the technical solution described above. Therefore, any simple modifications or equivalent substitutions made in accordance with the technical solution of the present invention are within the scope of the claims of the present invention.
Claims (5)
1. The utility model provides an intelligent public energy-saving comprehensive treatment device, includes public transformer (100), its characterized in that: public transformer (100) leading-out terminal connects four-quadrant inverter (200), passive filter (300) is connected in four-quadrant inverter (200), circuit breaker (400) is connected in passive filter (300), filter reactor (500) and filter capacitor (600) are connected in circuit breaker (400), filter reactor (500) are connected filter capacitor (600), circuit breaker (400) filter reactor (500) with IGBT module (700) are connected in filter capacitor (600), IGBT module (700) connect intelligent control ware (900) through three-phase bridge type wiring, direct current capacitor (800) are connected in IGBT module (700).
2. The intelligent public transformer energy-saving comprehensive treatment device according to claim 1, characterized in that: the intelligent controller (900) is composed of a sampling part, a CPU main control board and an output part.
3. The intelligent public transformer energy-saving comprehensive treatment device according to claim 2, characterized in that: the sampling portion is provided in a three-phase four-wire system.
4. The intelligent public transformer energy-saving comprehensive treatment device according to claim 1, characterized in that: the method also comprises a using method, and the specific steps are as follows:
s1, firstly, a 400V outgoing line end on a public transformer (100) is connected with a four-quadrant inverter (200), then, the four-quadrant inverter (200) is connected with a passive filter (300), after the connection, the passive filter (300) is used for absorbing harmonic components, the four-quadrant inverter (200) detects voltage and current and respectively controls the phases of the current and the voltage, so that the three-phase voltage stability and the three-phase current balance are achieved, the power factor is kept to be always kept above 0.95, and the purposes of reducing the fault rate of common household appliances, reducing the power consumption and reducing the power supply line loss are achieved;
s2, the IGBT module (700) is connected with the intelligent controller (900) through a three-phase bridge connection wire, so that split-phase control is achieved, three single-phase four-quadrant inversion power units are achieved, namely the intelligent controller (900) can have the functions of a motor and a generator, the magnitude of each phase of current is controlled respectively, and three-phase currents are balanced;
s3, according to the voltage amplitude, the current phase angle is adjusted to send out inductive reactive power when the voltage is higher, the voltage at the outlet of the public transformer (100) is reduced, and capacitive reactive power can be output when the voltage is lower, stepless voltage compensation is carried out on the power supply line to achieve the voltage stabilization effect, meanwhile, power factor adjustment can be conveniently carried out by controlling the current voltage phase, and redundant loss caused by reactive current on the line is reduced;
s4, when the load imbalance of the public transformer (100) is detected, the intelligent controller (900) detects and calculates that the phase with small current runs in the I quadrant, the power unit is in rectification charging to increase the phase current, the phase with large current runs in the III quadrant, the power unit is in inversion power generation to reduce the phase current to enable the phase current to reach the three-phase balance, and the harmonic wave absorbs the system harmonic wave through the passive filter (300), so that the power quality is improved, the faults of household appliances of common people are reduced, and the line accessory loss caused by the harmonic wave is reduced.
5. The intelligent public transformer energy-saving comprehensive treatment device according to claim 4, characterized in that: the detection calculation formula of the intelligent controller (900) in the S4 is as follows:
by the sampling part, respectively: ia. Ib and Ic current amplitude and the phase differences theta a, theta b and theta c of the Ua, Ub and Uc voltage amplitude and the current voltage;
firstly, calculating the active component and the reactive component of the single-phase current according to the single-phase current:
the active components are as follows:
Iap＝Ia*cosθa；
Ibp＝Ib*cosθb；
Icp＝Ic*cosθc；
the reactive current components are:
Iaq＝Ia*sinθa；
Ibq＝Ib*sinθb；
Icq＝Ic*sinθc；
and then calculating the average value of the three-phase active current:
I＝(Iap+Ibp+Icp)/3；
calculating the active current compensation value of each phase:
ia' ═ I-Iap ═ Iap + Ibp + Icp)/3-Iap (-No. is in a power generation state, + is in a rectification state);
ib' ═ I-Ibp ═ (Iap + Ibp + Icp)/3-Ibp (-No. is power generation state, + is rectification state);
ic ═ I-Icp ═ (Iap + Ibp + Icp)/3-Icp (-No. is power generation state, + is rectification state);
calculating a three-phase voltage compensation value:
let the impedance of the public transformer (100) be X1 and the line impedance be X2, and manually input by man-machine interaction:
then: Δ Ua ═ Un-Ua (+ output capacitive reactive-sign output inductive reactive);
Δ Ub ═ Un-Ub (+ output capacitive reactive-sign output inductive reactive);
Δ Uc ═ Un-Uc (+ output capacitive reactive-sign output inductive reactive);
the reactive power required to compensate the voltage is then:
Δ Qa ═ (Ia' + Iap)2 × (X1+ X2) (+ output capacitive reactive-sign output inductive reactive);
Δ Qb ═ (Ib' + Ibp)2 × (X1+ X2) (+ output capacitive reactive-signal output inductive reactive);
Δ Qc ═ Ic' + Icp)2 × (X1+ X2) (+ output capacitive reactive-sign output inductive reactive);
the voltage-compensated reactive current is:
△Iaq＝△Qa/Un；
△Ibq＝△Qb/Un；
△Icq＝△Qc/Un；
according to the calculation result, the output current of each phase of the intelligent controller (900) is obtained as follows:
phase a output current ═ ((Iap + Ibp + Icp)/3-Iap) + j (Ia X sin θ a + (Iap + Ibp + Icp)/3)2 × (X1+ X2));
phase B output current ═ ((Iap + Ibp + Icp)/3-Ibp) + j (Ib × sin θ B + (Iap + Ibp + Icp)/3)2 × (X1+ X2));
the phase C output current ═ ((Iap + Ibp + Icp)/3-Icp) + j (Ia X sin θ C + (Iap + Ibp + Icp)/3)2 × (X1+ X2));
the phase angle of the output current is:
Θa＝ACOS(Ia‘/(Ia‘+j(Iaq+△Iaq)))；
Θb＝ACOS(Ib‘/(Ib‘+j(Ibq+△Ibq)))；
Θc＝ACOS(Ic‘/(Ic‘+j(Icq+△Icq)))；
therefore, the current amplitude is calculated according to the intelligent controller (900) to determine the modulation pulse width, and the phase relation between the current and the voltage is determined, so that three functions of solving three-phase unbalance, power factor compensation and line voltage drop compensation by the intelligent controller (900) can be achieved.
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| CN113708383B (en) * | 2021-09-16 | 2024-05-17 | 安徽海螺建材设计研究院有限责任公司 | Comprehensive processing method and system for electric energy loss and electric energy quality |
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Application publication date: 20210618 |