CN105048480A - Dynamic reactive power compensation device - Google Patents

Dynamic reactive power compensation device Download PDF

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Publication number
CN105048480A
CN105048480A CN201510515877.9A CN201510515877A CN105048480A CN 105048480 A CN105048480 A CN 105048480A CN 201510515877 A CN201510515877 A CN 201510515877A CN 105048480 A CN105048480 A CN 105048480A
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control
dynamic reactive
compensation
time
current
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CN105048480B (en
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孙旭
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GUANGZHOU ELECTRIC POWER DESIGN INSTITUTE Co.,Ltd.
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Guangzhou electric power design institute
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30Reactive power compensation

Abstract

The invention discloses a dynamic reactive power compensation device, and the device comprises a system-level control unit which is used for obtaining operation parameters of a power grid, wherein the operation parameters comprise a voltage of the power grid, a current of the power grid, and the state quantity information of the power grid. Moreover, the system-level control unit is also used for determining a control target corresponding to a current control mode according to the current control mode, carrying out the analysis of the operation parameters of the power grid according to the control mode, and outputting a corresponding reactive power reference quantity. The current control mode comprises a steady state control mode, a transient state control mode, and any one of remote control modes. The device also comprises a device-level control unit which is used for carrying out function transfer according to the reactive power reference quantity, and giving a corresponding PWM reference wave. The device also comprises an element-level control unit which is used for generating a control pulse for controlling the working of an inverter bridge according to the PWM reference wave. The device achieves the dynamic reactive power compensation control in a mode of three-layer grading, is better in quick dynamic response, is high in response speed, can improve the stability of a transient voltage, and provides dynamic reactive power support.

Description

Dynamic reactive compensation device
Technical field
The present invention relates to electric power network technique field, particularly a kind of dynamic reactive compensation device.
Background technology
Due to a large amount of existence of reactive power in power supply grid, the reduction of the reduction of circuit power factor, the increase of loss and electric network reliability can be caused to a great extent, therefore, the demand of reactive power being carried out to quick dynamic compensation is also increasing, and reactive power compensation technology causes the concern of people just day by day as a kind of novel power network reactive power compensation mode.
The early stage reactive power compensation device of tradition is synchronous compensator, but because it is electric rotating machine, loss, noise are comparatively large, operation maintenance is complicated and response speed is slow, the demand of power network reactive power compensation can not be met, therefore gradually replace by static var compensator (SVC).SVC fast response time, safeguard simple, reliability is high, but the shortcoming simultaneously also having equipment volume greatly, easily to produce harmonic wave, easily resonance occurs, can not regulate continuously.
The appearance of dynamic reactive compensation device (SVG), avoids the shortcoming of SVC, but current dynamic reactive compensation device does not consider the stability of voltage, thus there is the risk producing voltage collapse accident.
Summary of the invention
Based on this, the object of the embodiment of the present invention is to provide a kind of dynamic reactive compensation device, and it can improve the stability of transient voltage, provides dynamic reactive power support.
For achieving the above object, the embodiment of the present invention by the following technical solutions:
A kind of dynamic reactive compensation device, comprising:
System-level control unit, for obtaining operation of power networks parameter, this operation of power networks parameter comprises: line voltage, power network current and electric network state amount information, and determine to correspond to the control objectives under this present control mode according to present control mode, and according to this control objectives, analyzing and processing is carried out to described operation of power networks parameter, export corresponding idle reference quantity, described present control mode comprises: any one in stable state control model, transient control mode, distant place control model;
Unit Level control unit, for carrying out function passes process according to described idle reference quantity, provides corresponding PWM reference wave;
Component-level control unit, for producing the control impuls controlling inverter bridge work according to described PWM reference wave.
According to the scheme of the embodiment of the present invention as above, it is that the mode of employing three layers of classification controls to realize dynamic passive compensation, thus has good fast dynamics, fast response time, the stability of transient voltage can be improved, dynamic reactive power support is provided.
Accompanying drawing explanation
Fig. 1 is the structural representation of the dynamic reactive compensation device of the present invention in an embodiment;
Fig. 2 is the theory structure schematic diagram of muti-layer control tactics;
Fig. 3 is the logical construction schematic diagram of the system-level control unit in an embodiment;
Fig. 4 is the principle schematic of two level SPWM methods;
Fig. 5 is the principle schematic of dead-time compensation.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that embodiment described herein only in order to explain the present invention, do not limit protection scope of the present invention.
The structural representation of the dynamic reactive compensation device of the present invention in an embodiment has been shown in Fig. 1.As shown in Figure 1, the dynamic reactive compensation device in the present embodiment comprises:
System-level control unit 101, for obtaining operation of power networks parameter, this operation of power networks parameter comprises: line voltage, power network current and electric network state amount information, and determine to correspond to the control objectives under this present control mode according to present control mode, and according to this control objectives, analyzing and processing is carried out to described operation of power networks parameter, export corresponding idle reference quantity, described present control mode comprises control model and comprises: any one in stable state control model, transient control mode, distant place control model;
Unit Level control unit 102, for carrying out function passes process according to described idle reference quantity, provides corresponding PWM (PulseWidthModulation, pulse width modulation) reference wave;
Component-level control unit 103, for producing the control impuls controlling inverter bridge work according to described PWM reference wave.
According to the scheme of the embodiment of the present invention as above, it is that the mode of employing three layers of classification controls to realize dynamic passive compensation, thus has good fast dynamics, fast response time, the stability of transient voltage can be improved, dynamic reactive power support is provided.
Accordingly, the theory structure schematic diagram of the muti-layer control tactics based on these three layers of grading control modes has been shown in Fig. 2.
Composition graphs 2 is visible, system-level control unit is in the position of top level control, it is mainly based on present control mode, with target to be compensated for control object (control objectives), determine overall Compensation Objectives, provide corresponding idle reference quantity (reference instruction), solve the input signal problem of whole control system.And Unit Level control unit is in the position that middle level controls, mainly determines to need which signal according to the target of top level control, how to utilize these signals, and provide PWM reference wave, and what solve is the problem of implementation of whole control system transfer function.Component-level control unit is in the position that lower floor controls, and mainly according to PWM reference wave, produces the control impuls controlling inverter bridge work, the output problem of whole control system that what it solved is.
Wherein, above-mentioned electric network state amount information can comprise bus connection switch state, can know two female paired runnings or two mother stock open shop by bus connection switch state, when System Reactive Power, can also know and get the idle of the idle of two-way or single channel.
In a concrete example, said elements level control unit 103 also regulates described control impuls, to control the Dead Time of power device switch, minimum service time and minimum turn-off time.
Below in conjunction with concrete example, that yuan 102 of said system level control unit 101, Unit Level control and component-level control unit 103 are illustrated respectively.
For system-level control unit 101, as mentioned above, the position of top level control is in, it is mainly based on present control mode, with target to be compensated for control object (control objectives), determine overall Compensation Objectives, provide corresponding idle reference quantity (reference instruction).
As mentioned above, in the scheme of inventive embodiments, present control mode comprises control model and comprises: stable state control model, transient control mode, distant place control model, wherein, this stable state control model specifically can comprise System Reactive Power control model, perseverance is idle/constant current controlling pattern, constant voltage control model three kinds.Below now be illustrated for each control model.
Under System Reactive Power control model, be mainly used in the idle of control system side, its control objectives is target or the scope of the idle of system side or power factor.
Perseverance is idle/constant current controlling pattern, and be mainly used in control device and export idle, its control objectives is the idle or electric current that device exports constant size.Idle accuracy and step response speed can be followed the tracks of by measurement mechanism in this way.
Constant voltage control model, is mainly used in control PCC point voltage level.Device makes the voltage stabilization of system in user's setting voltage desired value or setting range by regulating its idle output.When the Voltage Reference that system voltage sets lower than user, device exports capacitive reactive power with elevator system voltage; When system voltage is higher than this value, it is idle to reduce system voltage that device exports perception.
Transient control mode, mainly in order to the transient disturbance of answering system voltage, jump or fall control temporarily for answering system voltage or PCC voltage, when transient disturbance appears in system voltage, device detects this disturbance and adjusts output at once, to support rapidly or to reduce system voltage in several ms.Select to determine whether to enable this control mode by control model, if enable, this control mode priority is higher than stable state control model.
As mentioned above, the control objectives of transient control mode mainly suppresses transient voltage to change, and the possible cause that transient voltage changes comprise break down and load significantly uprush, feature is that voltage declines very soon, be likely monotonic decreasing, result will be transient voltage unstability and cause low pressure to discharge load.In order to maintain Transient Voltage Stability and reduce low pressure release load, under this transient control mode, require that on the one hand dynamic reactive compensation device can the larger capacity of dynamic compensation, require that dynamic reactive compensation device has response speed faster on the other hand.The fast dynamics of dynamic reactive compensation device has significant effect to minimizing release load, support voltage levvl, the response time of device is shorter, action effect is better, found by actual tests, the benefit when device response time is 30ms (millisecond) improves 58% than during 80ms.
Distant place control model is the transient disturbance of tackling electrical network, and when applying this pattern, dynamic reactive compensation device should carry out sufficient idle deposit when meeting operation of power networks condition, and therefore, this pattern also can be referred to as idle deposit control model.The control objectives of this distant place control model, is under systematic steady state runs, retains capacitive reactive power as much as possible for subsequent use, supports with the dynamic reactive strengthening electrical network
The logical construction schematic diagram of the system-level control unit in an embodiment has been shown in Fig. 3, and in shown in Fig. 3, U represents line voltage, and I represents power network current, U pCCrepresent access point information of voltage, coordination between each control model and switch and can select module management by a unified control model, the information such as required line voltage, power network current and electric network state amount, can be provided by voltage and current measurement-data preprocessing module.In addition, choosing logic and can being adjusted by man-machine interface of control model, in addition, can also set the controling parameters in various control model by man-machine interface.According to selected control model and running situation (line voltage, power network current and electric network state amount information etc.), corresponding idle reference quantity Q can be obtained ref.
This is idle reference quantity Q refcan be input to Unit Level control unit 102, Unit Level reference unit 102 is in conjunction with this idle reference quantity Q refwith access point information of voltage U pcc, calculate the current reference value I that 3-phase power converter need export ref_ab, I ref_bc, I ref_ca, and then exporting corresponding PWM reference wave, component-level control unit produces control impuls, with the work of control inverter based on this PWM reference wave.
Unit Level control unit 102 is carrying out function passes process to idle reference quantity, and when determining corresponding PWM reference wave, mainly comprise two processes, one is the generation of reference current, and another is the tracking of transient current.The generation of reference current, namely according to idle reference quantity and access point information of voltage, calculate the current reference value that 3-phase power converter need export, and the tracking of transient current can be undertaken by phase-splitting Instantaneous Control strategy.Phase-splitting transient current tracing controls the feature with quick follow load curent change, and its fast response time, to the strong adaptability of system voltage.Adopt phase-splitting transient current tracing algorithm to carry out function passes process to idle reference quantity, greatly can improve the ability that device withstands shocks, reduce the sensitiveness to system voltage sudden change, thus improve the reliability of device.The process of concrete generating reference electric current and the function passes process of transient current tracing, can adopt current existing routine to transmit processing mode and carry out, repeat no longer in detail at this.
When component-level control unit 103 produces based on the reference wave that Unit Level control unit 102 exports the control impuls controlling inverter bridge work, can carry out based on PWM method., can also regulate control impuls meanwhile, control with the Dead Time to power device switch, minimum service time and minimum turn-off time.
In PWM method, the most basic one is two level SPWM methods, and its principle as shown in Figure 4.The output of two level SPWM methods has two level :+E ,-E, and wherein, E represents direct voltage.Sinusoidal modulation wave and triangular carrier are compared, when sinusoidal modulation wave is greater than triangular carrier, current transformer exports+E level, otherwise then exports-E level.In shown in Fig. 4, (a) represents modulating wave and carrier wave, and (b) represents inverter output voltage).
When carrying out condition to control impuls, can carry out based on dead-time compensation control mode.It is the additional harmonic brought to reduce dead time effect that dead-time compensation controls, and compensates Dead Time, makes inverter obtain that expect or better output performance.The principle of dead-time compensation as shown in Figure 5.
In shown in Fig. 5, (a) is the compensation principle schematic diagram to positive voltage pulse, and (b) is the compensation principle schematic diagram to negative voltage pulse, wherein i lfor load current, t cmfor the dead time compensation time of power cell, be also the Dead Time of setting, P a1and P a3the pipe up and down (namely to pipe) of a power model brachium pontis respectively, P a2and P a4for the pipe up and down (namely to pipe) of another brachium pontis of power model.Compensation method be Dead Time is arranged to the pwm pulse of complementation while compensate.
For the pwm pulse of complementation, according to the not same-action to output voltage pulse, may be defined as main pulse and auxiliary pulse, the width of wherein main pulse determines the pulse duration of output voltage.The definition of main pulse, auxiliary pulse is followed the change in load current direction and changes, at load current i lwhen being greater than zero, P a1main pulse, P a3it is auxiliary pulse; Load current i lwhen being less than zero, P a3main pulse, P a1it is auxiliary pulse.
The concrete grammar of dead-time compensation can be: first Real-time Collection load current i ldirection, and determine main pulse and auxiliary pulse, then respectively arranging size to the rising edge of main pulse and trailing edge is t cmtime delay, at the rising edge of auxiliary pulse, 2t is set cmtime delay.
Comprehensive foregoing can be learnt, embodiment of the present invention scheme can possess following characteristics and advantage:
1) improve Enhancement of Transient Voltage Stability, prevent voltage collapse accident;
2) provide dynamic reactive to support, voltage resume after acceleration disturbance, reduce low pressure release load;
3) according to the needs of dispatching of power netwoks and control, the stable state pressure regulation of day-to-day operation can also be participated in part reactive capability; There is provided damping to control, suppress electric network power oscillation; As the subelement of AVC system, participate in the whole network REACTIVE POWER/VOLTAGE CONTROL.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.

Claims (10)

1. a dynamic reactive compensation device, is characterized in that, comprising:
System-level control unit, for obtaining operation of power networks parameter, this operation of power networks parameter comprises: line voltage, power network current and electric network state amount information, and determine to correspond to the control objectives under this present control mode according to present control mode, and according to this control objectives, analyzing and processing is carried out to described operation of power networks parameter, export corresponding idle reference quantity, described present control mode comprises: any one in stable state control model, transient control mode, distant place control model;
Unit Level control unit, for carrying out function passes process according to described idle reference quantity, provides corresponding PWM reference wave;
Component-level control unit, for producing the control impuls controlling inverter bridge work according to described PWM reference wave.
2. dynamic reactive compensation device according to claim 1, is characterized in that, described stable state control model comprises: System Reactive Power control model, permanent idle/constant current controlling pattern, constant voltage control model.
3. dynamic reactive compensation device according to claim 1, is characterized in that, described electric network state amount information comprises bus connection switch state, and described bus connection switch state comprises two female paired running, two mother stock open shop.
4. dynamic reactive compensation device according to claim 1, it is characterized in that, the mode that described Unit Level reference unit carries out function passes process comprises: determine according to described idle reference quantity and access point information of voltage the current reference value that 3-phase power converter need export, and exports corresponding PWM reference wave according to described current reference value.
5. dynamic reactive compensation device according to claim 4, is characterized in that, described Unit Level control unit also carries out function passes process according to the mode of phase-splitting transient current tracing.
6. dynamic reactive compensation device according to claim 1, is characterized in that, described component-level control unit produces described control impuls according to PWM method.
7. dynamic reactive compensation device according to claim 6, is characterized in that, described PWM method is two level SPWM methods.
8. dynamic reactive compensation device according to claim 6, is characterized in that, described component-level control unit also regulates described control impuls, to control the Dead Time of power device switch, minimum service time and minimum turn-off time.
9. dynamic reactive compensation device according to claim 8, is characterized in that, described component-level control unit adopts dead-time compensation control mode to regulate described control impuls.
10. dynamic reactive compensation device according to claim 9, is characterized in that, described dead-time compensation control mode comprises:
Real-time Collection load current direction, and determine main pulse and auxiliary pulse;
The time delay that size is dead time compensation time is respectively arranged to the rising edge of main pulse and trailing edge, the time delay of 2 times of times of dead time compensation time is set at the rising edge of auxiliary pulse.
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JPH04368429A (en) * 1991-06-14 1992-12-21 Hitachi Ltd Controller for inverter
CN1738144A (en) * 2005-09-01 2006-02-22 上海交通大学 Single-phase transformer four-layer IGBT type dynamic reactive compensator
CN103684031A (en) * 2013-12-03 2014-03-26 苏州景新电气有限公司 Current hysteresis control digital implementation system for PWM rectifier
CN104348175A (en) * 2014-11-12 2015-02-11 天津理工大学 Static synchronous compensator (STATCOM) control system based on digital signal processor (DSP) and control method of STATCOM control system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04368429A (en) * 1991-06-14 1992-12-21 Hitachi Ltd Controller for inverter
CN1738144A (en) * 2005-09-01 2006-02-22 上海交通大学 Single-phase transformer four-layer IGBT type dynamic reactive compensator
CN103684031A (en) * 2013-12-03 2014-03-26 苏州景新电气有限公司 Current hysteresis control digital implementation system for PWM rectifier
CN104348175A (en) * 2014-11-12 2015-02-11 天津理工大学 Static synchronous compensator (STATCOM) control system based on digital signal processor (DSP) and control method of STATCOM control system

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Title
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