CN100440679C - Mixing type virtual work compensator - Google Patents

Mixing type virtual work compensator Download PDF

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Publication number
CN100440679C
CN100440679C CNB021490481A CN02149048A CN100440679C CN 100440679 C CN100440679 C CN 100440679C CN B021490481 A CNB021490481 A CN B021490481A CN 02149048 A CN02149048 A CN 02149048A CN 100440679 C CN100440679 C CN 100440679C
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China
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compensator
reactive
power
load
load compensator
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CN1503424A (en
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张耀仁
吴晋昌
周宏亮
徐文彬
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YINGZHENG YUSHUN ELECTRONICS CO Ltd
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YINGZHENG YUSHUN ELECTRONICS CO Ltd
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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

Abstract

The present invention discloses a hybrid virtual work compensator which mainly comprises a passive virtual work compensator and an active virtual work compensator, wherein the two compensators are connected in series. The passive virtual work compensator is an alternate current power capacitor and is used for providing advance virtual work amount to reduce the capacity of the active virtual work compensator, and the active virtual work compensator is composed of a power converter, a direct current energy storage capacitor, a high frequency ripper filter and a controller. The virtual work compensating amount of the hybrid virtual work compensator can be adjusted in a stepless mode by the active virtual work compensator, the active virtual work compensator of the present invention has a function of making the current of the hybrid virtual work compensator be approximate to sinusoidal waves, and the problem of damaged harmonic of the hybrid virtual work compensator can be avoided.

Description

Hybrid reactive power compensator
Technical field
The present invention relates to a kind of hybrid reactive power compensator, especially relate to about utilizing a passive type reactive-load compensator and an active formula reactive-load compensator serial connection combination device in the electrical power trans mission/distribution system in order to compensating reactive power, the idle amount that it provided can be in a particular range internal linear adjustment, and active formula reactive-load compensator of the present invention has the electric current that makes this hybrid reactive power compensator and is close to sinusoidal wave function, can avoid hybrid reactive power compensator and power-supply system reactance to produce resonance and causes the fault of reactive compensation system itself and vicinity power equipment.
Background technology
Most load is an inductive in the existing electrical power trans mission/distribution system, it causes the backward power factor of system, therefore in order to compensate backward power factor, electrical power trans mission/distribution system needs bigger electric current can transmit the identical power that has, thereby reduce the efficiency of transmission of this electrical power trans mission/distribution system, and increase the voltage regulation of load end.Utilities Electric Co. and user generally add passive reactive-load compensator (being the alternating electromotive force capacitor) and are parallel to system in order to overcome foregoing problems on electrical power trans mission/distribution system, so that provide idle in advance, and the power factor of raising total system.According to research, use the alternating electromotive force capacitor volume to account for 25% to 35% of electric power system total capacity in the electrical power trans mission/distribution system, some system even up to 50%.In recent years because the use of a large amount of nonlinear loads, cause harmonic pollution serious day by day, and the device that is subject to harmonic pollution destruction in the electric power system most is an alternating electromotive force capacitor group, because alternating electromotive force capacitor group provides the low impedance path of harmonic current, and easy and power-supply system reactance produces resonance, and amplify harmonic current and voltage, thereby cause the overvoltage or the over-current damage of alternating electromotive force capacitor, contiguous simultaneously power equipment also may be because resonance causes superpotential destruction.
In order to solve the issuable resonance problems of alternating electromotive force capacitor, existing solution is for improving alternating electromotive force capacitor voltage withstand class, so can avoid the alternating electromotive force capacitor to destroy because of resonance overvoltage, yet it is unresolved resonance problems also, therefore the destruction that may cause contiguous power equipment.Another solution cuts off power-supply system with the alternating electromotive force capacitor for utilizing protective device when alternating electromotive force overvoltage of capacitor or the overcurrent, yet this method will make the no-power compensation function forfeiture.
Because fixedly the idle amount that provides of alternating electromotive force capacitor group can't be adjusted with load change for fixing, usually when underloading, cause power factor to produce too high voltage in advance.For the idle amount that the alternating electromotive force capacitance group is provided can suitably be adjusted, therefore industry develops automatic power factor regulator (automatic power facter regulator APFR), as shown in Figure 1, automatic power factor regulator utilizes an alternating electromotive force capacitor group C 1To C NCooperate a switches set S 1To S NCombination is finished, the idle amount that it is provided by the alternating electromotive force capacitors count adjustment of control input power-supply system 1 itself.Though the idle amount that automatic power factor regulator compensated can be with the load adjustment, its adjustment mode is the step adjustment, promptly can't carry out linearity adjustment, therefore can't make input power factor near unity power factor.
Please refer to shown in Figure 2, another power-factor adjustment device is to utilize a reactor 11 combinations of a fixed capacity C thyristor in parallel 10 controls to finish, it is called fixed capacity thyristor-controlled reactor (Fixed-Capacitor Thyristor-ControLLed Reactor, FC one TCR), it utilizes the phase control of thyristor 10 to reach the linear function that the idle amount that provides is provided.Yet,, cause harmonic pollution because thyristor is adopted phase control, thereby produces bigger harmonic content.
Though aforementioned two kinds of devices can be adjusted the reactive power compensation amount, the alternating electromotive force capacitor still directly is parallel to power-supply system, so the problem that still can't avoid resonance to destroy.
Please refer to Fig. 3, the equipment that its announcement is formed with the high power power electronic element also can be applicable to electrical power trans mission/distribution system and does reactive power compensation, be called active formula reactive-load compensator, it utilizes an electric power converter (power converter) to receive power-supply system 1 through linking an inductor 21, its DC side is to receive a direct current energy storage capacitor 22, control by electric power converter 20, this active formula reactive-load compensator 2 can provide idle amount leading or that fall behind, and its idle amount that provides can linearity be adjusted according to load change, make input power factor maintain unity power factor, and this active power factor correction system can not produce resonance with power-supply system, therefore do not have the problem that alternating electromotive force capacitor resonance destroys, yet because the capacity of active formula reactive-load compensator 2 must comprise the required whole idle amount of load, it needs very large capacity, make its price very expensive, thereby limit its practicality.
Summary of the invention
Main purpose of the present invention provides a kind of hybrid reactive power compensator, it utilizes a passive type reactive-load compensator and an active formula reactive-load compensator to be composed in series, it is in order to provide the idle amount of stepless adjustment, avoid the harmonic wave of reactive power compensator to destroy, and the present invention have the effect that reduces manufacturing cost.
Hybrid reactive power compensator of the present invention, it is parallel to a power-supply system to provide idle, improves power factor, and this device mainly comprises a passive type reactive-load compensator and an active formula reactive-load compensator, and both are composed in series.This passive type reactive-load compensator is the alternating electromotive force capacitor, in order to an idle amount to be provided, and reduce the idle amount that this active formula reactive-load compensator is provided, thereby can reduce the power capacity of active formula reactive-load compensator, because the cost of alternating electromotive force capacitor is far below the cost of active reactive-load compensator, therefore manufacturing cost of the present invention is lower than the manufacturing cost of existing active reactive-load compensator.This active formula reactive-load compensator is by an electric power converter, one direct current energy storage capacitor, an one high frequency ripple filter and a controller are formed, this hybrid reactive power compensator its compensating reactive power amount that provides of stepless adjustment in a preset range is provided for it, and this active formula reactive-load compensator is got a power-supply system voltage, produce the reference current signal of the string ripple of a leading current system voltage 90 degree as described active formula reactive-load compensator, and the electric current that adopts current control mode that this active formula reactive-load compensator is had to make this hybrid reactive power compensator is close to sinusoidal wave function, can avoid passive type reactive power compensator and power-supply system reactance to produce resonance and causes the fault of reactive compensation system itself and vicinity power equipment.
The present invention proposes a kind of hybrid reactive power compensator, it can be provided at the idle amount of stepless adjustment in the scope, active formula reactive-load compensator of the present invention has the function that the electric current that makes hybrid reactive power compensator is close to sine wave simultaneously, can avoid reactive power compensator itself and power-supply system reactance to produce resonance, and cause reactive power compensator itself and the fault of being close to power equipment, and its cost is far below existing active reactive power compensator.
Description of drawings
Fig. 1 is the configuration diagram of existing automatic power factor corrector;
Fig. 2 is the configuration diagram of existing fixed capacity thyristor-controlled reactor;
Fig. 3 is the configuration diagram of existing active formula reactive-load compensator;
Fig. 4 is the configuration diagram of the hybrid reactive power compensator of the present invention's first preferred embodiment;
Fig. 5 is the calcspar of controller of the active formula reactive-load compensator of the hybrid reactive power compensator of the present invention's first preferred embodiment;
Fig. 6 is hybrid reactive power compensator of the present invention's second preferred embodiment and the automatic power factor update the system configuration diagram of using in parallel;
Fig. 7 is the hybrid reactive power compensator configuration diagram of the present invention's the 3rd preferred embodiment.
Embodiment
In order to allow above-mentioned and other purposes of the present invention, feature and advantage understand by clearer and more definite quilt, hereinafter will be especially exemplified by preferred embodiment of the present invention, and cooperate appended graphicly, be described in detail below:
Fig. 4 discloses the system architecture of first preferred embodiment of hybrid reactive power compensator of the present invention, the hybrid reactive power compensator 3 of the present invention is parallel between a power-supply system 1 and the load 4, this power-supply system 1 supply one AC energy to this load 4 is used, 3 of this hybrid reactive power compensators are in order to compensate the required reactive power of this load 4, to improve from the power factor of this power-supply system 1 input.It comprises a passive type reactive-load compensator 31 and an active formula reactive-load compensator 32 is composed in series this hybrid reactive power compensator 3.This passive type reactive-load compensator 31 is in order to provide an idle amount, reduce the idle amount that this active formula reactive-load compensator 32 is provided by this, this active formula reactive-load compensator 32 comprises an electric power converter 320, a direct current energy storage capacitor 321, a high frequency ripple filter 322 and a controller 323, this active formula reactive-load compensator with so that hybrid reactive power compensator can stepless its compensation of adjustment in a certain particular range idle amount, and this active formula reactive-load compensator also can be avoided the issuable resonance destruction of institute between this hybrid reactive power compensator and power-supply system.Fig. 5 discloses the calcspar of the controller 323 of active formula reactive-load compensator in the present invention's first preferred embodiment.The active formula reactive-load compensator 32 of this first preferred embodiment adopts the Current Control formula, its principle is to utilize the control of electric power converter 320 in the active formula reactive-load compensator to force the electric current that this hybrid reactive power compensator 3 flows through only to contain basic wave, can adjust the idle amount that this hybrid reactive power compensator 3 is provided by the amplitude of adjusting this basic wave electric current, and owing to flow through the electric current of this hybrid reactive power compensator is the sine wave of a fundamental frequency, therefore avoids this hybrid reactive power compensator 3 destroyed by harmonic wave.
Please refer to Fig. 4, shown in Figure 5, the controller 323 of active formula reactive-load compensator in the present embodiment 1, its reference current signal is by two control signal S 1And S 2Form this first control signal S 1Be the function that is used for finishing idle adjustment, because this active formula reactive-load compensator 32 is a current control mode, so this first control signal S 1Be necessary for the basic wave signal of leading current system voltage 90 degree, this load current and this power-supply system voltage are sent into the amplitude that an idle counting circuit 502 calculates the reactive current of these hybrid idle device 3 required compensation through one first band pass filter 500 and one second band pass filter, 501 its basic wave compositions of taking-up respectively.And in order to determine to provide the waveform of reactive current, the power-supply system voltage fundamental composition of this second band pass filter 501 outputs is also delivered to the basic wave signals that a phase-shift circuit 503 produces leading 90 degree, a multiplier 504 is delivered in this phase-shift circuit 503 and the output of idle counting circuit 502 multiplied each other and can obtain the first control signal S 1This second control signal S 2Be mainly used to do the voltage stabilizing usefulness of active formula reactive-load compensator 32 DC side storage capacitors 321.Because this active formula reactive-load compensator itself has power loss, so the voltage on the DC side storage capacitor 321 of this active formula reactive-load compensator 32 will rise or descend, in order to keep this active formula reactive-load compensator 32 normal runnings, its dc voltage must be kept a stationary value, therefore this active formula reactive-load compensator 32 must or be sent back to meritorious from power-supply system 1 absorption, that is must produce the basic wave electric current that has with this power-supply system voltage same phase, for reaching this purpose, the dc voltage of this active formula reactive-load compensator 32 is delivered to a subtracter 505 with its setting voltage and is subtracted each other after detecting, this subtracter 505 subtracts each other the result and delivers to one first controller 506, these first controller, 506 outputs are delivered to a multiplier 507 with the basic wave signal of these second band pass filter, 501 outputs and are multiplied each other, and can obtain the second control signal S 2
Referring again to Fig. 4, shown in Figure 5, with two control signal S 1And S 2Deliver to an adder 508 additions and can obtain reference signal, this reference signal is delivered to a subtracter 509 with the output current of this active formula reactive-load compensator 32 and is subtracted each other, the output of this subtracter 509 is delivered to one second controller 510 and is obtained a modulation signal, the modulation signal of this second controller 510 outputs is delivered to a pulse-width modulation circuit 511 and is produced a pulse-width signal, and Hou is delivered to the drive signal that one drive circuit 512 produces the electric power converter 320 of these active formula reactive-load compensators 32 with the pulse-width signal that this pulse-width modulation circuit 511 produces again.
Please refer to and Figure 6 shows that second preferred embodiment of the present invention, second preferred embodiment is the hybrid reactive power compensator 3 and an automatic power factor Adjustment System 6 parallel connections of first preferred embodiment, be parallel to again after this hybrid reactive power compensator 3 and 6 parallel connections of automatic power factor Adjustment System between a power-supply system 1 and the load 4, this power-supply system 1 supply one AC energy to this load 4 is used, the combination of this hybrid reactive power compensator 3 and 6 parallel connections of automatic power factor Adjustment System is then in order to compensate the required reactive power of this load 4, these automatic power factor Adjustment System 6 sectionals are adjusted idle amount, in one section idle amount of this automatic power factor Adjustment System 6, carry out stepless adjustment by this hybrid reactive power compensator 3 again, that is this automatic power factor update the system 6 is coarse adjustment, and this hybrid reactive power compensator 3 is fine setting, almost is unity power factor so that input power factor rises to.So, the capacity of this hybrid reactive power compensator 3 can significantly reduce, so this second embodiment is as long as add once can reach the function of the stepless adjustment of the idle amount of entire compensation to automatic power factor Adjustment System 6 than the hybrid reactive power compensator 3 of low capacity.
Please refer to and Figure 7 shows that the present invention's the 3rd preferred embodiment mixed type reactive power compensator 3, hybrid reactive power compensator 3 of the present invention is parallel between a power-supply system 1 and the load 4, this power-supply system 1 supply one AC energy to this load 4 is used, 3 of this hybrid reactive power compensators are in order to compensate the required reactive power of this load 4, to improve from the power factor of this power-supply system 1 input.This hybrid reactive power compensator 3 comprises a passive type reactive-load compensator 31 and an active formula reactive-load compensator 32, both are composed in series, and this passive type reactive-load compensator 31 is a thyristor switch capacitor group (TSC) that is in series by thyristor groups 310 alternating electromotive force capacitor groups 311; This hybrid reactive power compensator 3 is by the capacitor 311 of switching to drop into different hop counts of the thyristor groups 310 of this passive type reactive-load compensator 31, the coarse adjustment of idle amount by way of compensation, again the active formula reactive-load compensator 32 by this hybrid reactive power compensator 3 as the fine setting of idle amount so that input power factor reach near unity power factor, and this active reactive power compensator 32 is that to adopt the control mode of active formula reactive-load compensator in first preferred embodiment to make the electric current that flows into this hybrid reactive power compensator 3 be a fundamental frequency string ripple, the destruction that therefore can avoid the alternating electromotive force capacitors 311 in this passive type reactive-load compensator 31 to cause because of harmonic wave.
Though the present invention discloses with aforementioned preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this operator; without departing from the spirit and scope of the present invention; when can doing various changes and modification, so protection scope of the present invention is as the criterion when the claim that look in the claims of front.

Claims (7)

1, a kind of hybrid reactive power compensator, it is parallel to a power-supply system to provide idle, improves power factor, it is characterized in that this device comprises:
A passive type reactive-load compensator;
And an active formula reactive-load compensator, it is connected with this passive type reactive-load compensator; Wherein this passive type reactive-load compensator is in order to providing an idle amount, and reduces the power capacity of this active formula reactive-load compensator; This active formula reactive-load compensator is used so that this hybrid reactive power compensator its compensating reactive power amount of stepless adjustment in a preset range, and this active formula reactive-load compensator is got a power-supply system voltage, produce the reference current signal of the string ripple of a leading current system voltage 90 degree as described active formula reactive-load compensator, and the electric current that adopts current control mode that this active formula reactive-load compensator is had to make this hybrid reactive power compensator is close to sinusoidal wave function, destroyed by harmonic wave to prevent this hybrid reactive power compensator.
2, the described hybrid reactive power compensator of claim 1 is characterized in that this passive type reactive-load compensator is an alternating electromotive force capacitor or one group of thyristor switch capacitor group.
3, the described hybrid reactive power compensator of claim 1, when it is characterized in that this passive type reactive-load compensator is one group of thyristor switch capacitor group, this thyristor switch capacitor group is used for coarse adjustment compensating reactive power amount, this hybrid reactive-load compensator then is used to finely tune the compensating reactive power amount, so that power factor rises to the near unit power factor.
4, the described hybrid reactive power compensator of claim 1 is characterized in that this active formula reactive-load compensator is made up of an electric power converter, a dc energy storage capacitor, a high frequency ripple filter and a controller.
5, the described hybrid reactive power compensator of claim 1, the reference current signal that it is characterized in that the active formula reactive-load compensator of this current control mode is made up of one first control signal and one second control signal, this reference current signal is delivered to a subtracter with this output current of this active formula reactive-load compensator and is subtracted each other, the output of this subtracter is delivered to one second controller and is obtained a modulating signal, this modulating signal is delivered to a pulse-width modulation circuit and is produced a pulse-width modulation signal, this pulse-width modulation signal is delivered to a drive circuit and is produced a drive signal, drives an electric power converter of this active formula reactive-load compensator.
6, the described hybrid reactive power compensator of claim 5, it is characterized in that this first control signal is the function that is used for finishing idle adjustment, because this active formula reactive-load compensator is a current control mode, therefore this first control signal is necessary for the basic wave signal of leading these power-supply system voltage 90 degree, its amplitude can be adjusted, to provide adjustable idle in advance; This second control signal is mainly used to do the voltage stabilizing of the dc energy storage electric capacity of this active formula reactive-load compensator and uses, this second control signal is and the synchronous basic wave signal of this power-supply system voltage, be used for gaining merit, to stablize the dc energy storage capacitance voltage of this active formula reactive-load compensator from this power-supply system absorption or loopback.
7, the described hybrid reactive power compensator of claim 1, it is characterized in that this hybrid reactive power compensator is in parallel with an automatic power factor Adjustment System, this automatic power factor Adjustment System is used for coarse adjustment compensating reactive power amount, this hybrid reactive power compensator then is used to finely tune the compensating reactive power amount, so that power factor rises to the near unit power factor.
CNB021490481A 2002-11-20 2002-11-20 Mixing type virtual work compensator Expired - Lifetime CN100440679C (en)

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CN113726160A (en) * 2018-06-29 2021-11-30 上海联影医疗科技股份有限公司 Output characteristic adjusting circuit and power supply system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2384356Y (en) * 1999-07-27 2000-06-21 林希武 Power compensating energy-saving device
CN2419726Y (en) * 2000-04-26 2001-02-14 北京金自天正智能控制股份有限公司 Automatic compensator for power factor of network
CN1356753A (en) * 2001-09-19 2002-07-03 西安交通大学 Control method of active power filter in mixed filter system for electrified railway

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2384356Y (en) * 1999-07-27 2000-06-21 林希武 Power compensating energy-saving device
CN2419726Y (en) * 2000-04-26 2001-02-14 北京金自天正智能控制股份有限公司 Automatic compensator for power factor of network
CN1356753A (en) * 2001-09-19 2002-07-03 西安交通大学 Control method of active power filter in mixed filter system for electrified railway

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