CN104917193B - Hybrid dynamic reactive power compensation device with resonance suppression function and method - Google Patents
Hybrid dynamic reactive power compensation device with resonance suppression function and method Download PDFInfo
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Abstract
The present invention discloses a hybrid dynamic reactive power compensation device with a resonance suppression function and method. The device comprises a converter and a reactive power compensator in series connection, wherein the reactive power compensator comprises several reactive power compensation branches in parallel connection, the reactive power compensation branches being composed of a switch, a capacitor and an inductor connected in turn. According to the present invention, continuous reactive power compensation and resonance suppression with low cost and large capacity can be achieved.
Description
Technical field
The invention belongs to the power quality control technology field of power system, it is related to a kind of there is the mixed of resonance suppression function
Close dynamic reactive compensation device and method.
Background technology
In power system, shnt capacitor is usually used to carry out reactive-load compensation.But shnt capacitor compensation capacity is solid
Determine it is impossible to realize Continuous Var Compensation.The extensive application in power system with nonlinear load simultaneously, can produce harmonic wave electricity
The harmonious wave voltage of stream, leads to reactive-load compensation capacitor and power network line impedance that resonance occurs, the harmonic wave of triggering shnt capacitor is protected
Protect and trip, affect normal reactive-load compensation.
Under normal circumstances, for realizing Continuous Var Compensation, STATCOM and shnt capacitor can be used in mixed way, both are simultaneously
It is coupled to electrical network bus.But this compensation aspect is applied to low pressure occasion, under high pressure, STATCOM is had high demands, cost increase.And
Realized by adding current-limiting reactor during resonance suppression.The method for designing of current-limiting reactor is as follows：When mains by harmonics content is minimum
Secondary when being 3 times, current-limiting reactor capacity is the 12% of shnt capacitor；When mains by harmonics content low order is 5 times, series electrical
Anti- device capacity is the 5% of shnt capacitor.Such effect is that reactive-load compensation branch road always assumes perception, harmonic wave electricity in harmonic wave section
Stream will not be exaggerated.But this method has certain limitation, when mains by harmonics frequency spectrum changes, current-limiting reactor is simultaneously
It cannot be guaranteed that idle branch always assumes perception in all harmonic wave sections, harmonic wave still has exaggerated possibility.Another kind of method is
Carry out resonance suppression using mixed active electric power filter, but compound filter is very sensitive to systematic parameter, systematic parameter
Change can make its control effect be deteriorated.In addition, traditional compound filter does not have the function of introducing dynamic passive compensation, because
For Converter Capacity so can be made to become big, increase cost.
Content of the invention
It is an object of the invention to the shortcoming overcoming above-mentioned prior art, there is provided a kind of have the mixed of resonance suppression function
Close dynamic reactive compensation device and method, this device and method is capable of inexpensive, jumbo Continuous Var Compensation and humorous
Shake suppression.
For reaching above-mentioned purpose, the mixing dynamic reactive compensation device with resonance suppression function of the present invention includes
The current transformer being sequentially connected in series and reactive-load compensator.
Described reactive-load compensator includes some reactive-load compensation branch roads being connected in parallel, and each reactive-load compensation branch road is by successively
Switch, capacitor and the inductance composition being connected.
The mixing dynamic reactive compensating method with resonance suppression function of the present invention comprises the following steps：
1) detect load current, and obtain idle point of load current according to described load current by idle detection algorithm
Amount, further according to load the switch that controls in reactive-load compensator in each reactive-load compensation branch road of reactive capability carry out reactive-load compensator and
The compensation capacity distribution of current transformer, obtains the passive impedance of reactive-load compensation branch road, then passive according to described reactive-load compensation branch road
Impedance instructs U by the fundamental voltage idle component that idle computational methods obtain current transformerinvfaq、UinvfbqAnd Uinvfcq；
2) detect the electric current of reactive-load compensation branch road, and Harmonic Detecting Algorithm is passed through according to the electric current of described reactive-load compensation branch road
Obtain the harmonic current of reactive-load compensation branch road, then unsteady flow is obtained according to the harmonic current of default harmonic wave resistance and reactive-load compensation branch road
The harmonic voltage instruction U of deviceinvah、UinvbhAnd Uinvch；
3) detect the DC voltage of current transformer, obtain the DC voltage of current transformer and the difference of preset voltage value, so
The difference of the DC voltage according to current transformer and preset voltage value obtains the base of current transformer by DC voltage closed loop control afterwards
Wave voltage real component instructs Uinvfap、UinvfbpAnd Uinvfcp；
4) by step 1) the fundamental voltage idle component instruction U of the current transformer that obtainsinvfaq、UinvfbqAnd Uinvfcq, step 2)
The fundamental voltage real component instruction U of the current transformer obtaininginvah、UinvbhAnd Uinvch, and step 3) fundamental voltage that obtains has
Work(component instruction Uinvfap、UinvfbpAnd UinvfcpIt is added, obtain the AC voltage instruction U of current transformerinva、UinvbAnd Uinvc, then
AC voltage instruction U according to described current transformerinva、UinvbAnd UinvcControl the exchange of current transformer through AC voltage close loop
Side voltage.
Step 1) concrete operations be：
11) detect load current, obtain a phase current I loadingLa, b phase current ILbAnd c phase current ILc, by a phase of load
Electric current ILa, b phase current ILbAnd c phase current ILcCarry out CLARKE conversion, PARK conversion and low pass filter Filtering Processing successively,
Obtain real component I under rest frame for the load currentLdWith idle component ILq, then by load current in static coordinate
System under to idle component ILqCarry out PARK inverse transformation and CLARKE inverse transformation successively, obtain load current under natural system of coordinates
Idle component ILqa、ILqbAnd ILqc；
12) according to step 11) load current that obtains idle component I under natural system of coordinatesLqa、ILqbAnd ILqcControl
Switch in each reactive-load compensation branch road completes reactive-load compensator and the distribution of current transformer compensation capacity, obtains the shnt capacitor of input
Group；
13) obtain mixing the passive part impedance Z of dynamic reactive compensation device according to the shnt capacitor group putting intoC, so
Passive part impedance Z according to mixing dynamic reactive compensation device afterwardsC, PCC point line voltage USWith load current idle component
ILqU is instructed by the fundamental voltage idle component that idle algorithm obtains current transformerinvfaq、UinvfbqAnd Uinvfcq.
Step 2) concrete operations be：
21) obtain electric network impedance ZS, according to electric network impedance ZSObtain grid current harmonic content Ish_rmsLetter with harmonic wave resistance r
Number relation, and the passive part impedance Z according to mixing dynamic reactive compensation deviceCThe reactive current harmonic wave obtaining power network current contains
Amount Ich_rmsWith the functional relationship of harmonic wave resistance r, then according to grid current harmonic content Ish_rmsClose with the function of harmonic wave resistance r
System, reactive current harmonic content I of power network currentch_rmsWith the functional relationship of harmonic wave resistance r and the harmonic wave of shnt capacitor
Protection demand obtains minimum harmonic wave resistance rmin；
22) consider that current transformer has switch time delay and sampling time delay, obtain the transmission function of harmonic wave resistance, according to described harmonic wave
The transmission function of resistance draws the bode figure of harmonic wave resistance open-loop transfer function, and according to described harmonic wave resistance open-loop transfer function
Bode figure and the durability requirements of system obtain maximum harmonic wave resistance rmax；
23) detect the electric current I of reactive-load compensation branch roadC, obtain a phase current I of reactive-load compensation branch roadCa, b phase current ICbAnd c phase
Electric current ICc, a phase current I of described reactive-load compensation branch roadCa, b phase current ICbAnd c phase current ICcCarry out successively CLARKE conversion,
PARK conversion, low pass filter Filtering Processing, PARK inverse transformation and CLARKE inverse transformation, obtain the current first harmonics of reactive-load compensation branch road
Component ICaf、ICbfAnd ICcf, by a phase current I of reactive-load compensation branch roadCa, b phase current ICbAnd c phase current ICcRespectively with idle benefit
Repay the current first harmonics component I of branch roadCaf、ICbfAnd ICcfSubtract each other, obtain the current harmonics component I of reactive-load compensation branch roadCah、ICbhAnd
ICch, then by the current harmonics component I of reactive-load compensation branch roadCah、ICbhAnd ICchIt is multiplied with default harmonic wave resistance value respectively, obtain
Harmonic voltage instruction Uinvah、UinvbhAnd Uinvch.
The invention has the advantages that：
The mixing dynamic reactive compensation device with resonance suppression function of the present invention and method, in operation, are passed through
Detection load current obtains the reactive capability loading, and then the reactive capability according to load controls further according to the reactive capability of load
Switch in each reactive-load compensation branch road in reactive-load compensator carries out the compensation capacity distribution of reactive-load compensator and current transformer, realizes control
The AC fundamental voltage of current transformer processed, and then realize Large Copacity Continuous Var Compensation.In addition, by detecting the humorous of idle branch
The harmonic voltage of ripple current control current transformer, controls into harmonic wave resistance to carry out resonance suppression in harmonic wave section, thus obtaining preferably
Resonance suppression effect, and energy can be saved, there is good engineer applied meaning, and be applied to the idle benefit of bulk power grid
When repaying, active loss can be reduced while effective damping resonance.In specific operation process, detection load current is loaded
Reactive capability, the reactive capability then loading is according to the switching carrying out shnt capacitor, and controls AC side of converter fundamental wave
Voltage carries out dynamic passive compensation；Obtain the harmonic voltage that harmonic componentss control current transformer by detecting idle branch current,
Harmonic wave section assumes resistance characteristic, realizes damping function, and when shnt capacitor occurs switching, harmonic wave resistance can be carried out accordingly
Optimize and revise.
Brief description
Fig. 1 is the compensation schematic diagram under shnt capacitor undercompensation in the present invention；
Fig. 2 is the compensation schematic diagram under shnt capacitor overcompensation in the present invention；
Fig. 3 is in reactive-load compensation Hysteresis control schematic diagram in the present invention；
Fig. 4 be the present invention in compensation process grid current harmonic content perunit value with harmonic wave resistance change curves；
Fig. 5 is that in the present invention, in compensation process, idle branch current harmonic content perunit value is bent with harmonic wave resistance variations
Line；
Fig. 6 is the bode figure of the harmonic wave resistance open-loop transfer function in the present invention；
Fig. 7 is the circuit theory diagrams of the mixing dynamic reactive compensation device in the present invention with resonance suppression function.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in further detail：
With reference to Fig. 7, the mixing dynamic reactive compensation device with resonance suppression function of the present invention includes going here and there successively
Current transformer and reactive-load compensator that connection connects, reactive-load compensator includes some reactive-load compensation branch roads being connected in parallel, each idle
Compensate branch road and formed by being sequentially connected the switch connecing, capacitor and inductance.
The mixing dynamic reactive compensating method with resonance suppression function of the present invention comprises the following steps：
1) detect load current, and obtain idle point of load current according to described load current by idle detection algorithm
Amount, further according to load the switch that controls in reactive-load compensator in each reactive-load compensation branch road of reactive capability carry out reactive-load compensator and
The compensation capacity distribution of current transformer, obtains the passive impedance of reactive-load compensation branch road, then passive according to described reactive-load compensation branch road
Impedance instructs U by the fundamental voltage idle component that idle computational methods obtain current transformerinvfaq、UinvfbqAnd Uinvfcq；
2) detect the electric current of reactive-load compensation branch road, and Harmonic Detecting Algorithm is passed through according to the electric current of described reactive-load compensation branch road
Obtain the harmonic current of reactive-load compensation branch road, then unsteady flow is obtained according to the harmonic current of default harmonic wave resistance and reactive-load compensation branch road
The harmonic voltage instruction U of deviceinvah、UinvbhAnd Uinvch；
3) detect the DC voltage of current transformer, obtain the DC voltage of current transformer and the difference of preset voltage value, so
The difference of the DC voltage according to current transformer and preset voltage value obtains the base of current transformer by DC voltage closed loop control afterwards
Wave voltage real component instructs Uinvfap、UinvfbpAnd Uinvfcp；
4) by step 1) the fundamental voltage idle component instruction U of the current transformer that obtainsinvfaq、UinvfbqAnd Uinvfcq, step 2)
The fundamental voltage real component instruction U of the current transformer obtaininginvah、UinvbhAnd Uinvch, and step 3) fundamental voltage that obtains has
Work(component instruction Uinvfap、UinvfbpAnd UinvfcpIt is added, obtain the AC voltage instruction U of current transformerinva、UinvbAnd Uinvc, then
AC voltage instruction U according to described current transformerinva、UinvbAnd UinvcControl the exchange of current transformer through AC voltage close loop
Side voltage.
Step 1) concrete operations be：
11) detect load current, obtain a phase current I loadingLa, b phase current ILbAnd c phase current ILc, by a phase of load
Electric current ILa, b phase current ILbAnd c phase current ILcCarry out CLARKE conversion, PARK conversion and low pass filter Filtering Processing successively,
Obtain real component I under rest frame for the load currentLdWith idle component ILq, then by load current in static coordinate
System under to idle component ILqCarry out PARK inverse transformation and CLARKE inverse transformation successively, obtain load current under natural system of coordinates
Idle component ILqa、ILqbAnd ILqc；
12) according to step 11) load current that obtains idle component I under natural system of coordinatesLqa、ILqbAnd ILqcControl
Switch in each reactive-load compensation branch road completes reactive-load compensator and the distribution of current transformer compensation capacity, obtains the shnt capacitor of input
Group；
13) obtain mixing the passive part impedance Z of dynamic reactive compensation device according to the shnt capacitor group putting intoC, so
Passive part impedance Z according to mixing dynamic reactive compensation device afterwardsC, PCC point line voltage USWith load current idle component
ILqU is instructed by the fundamental voltage idle component that idle algorithm obtains current transformerinvfaq、UinvfbqAnd Uinvfcq.
Step 2) concrete operations be：
21) obtain electric network impedance ZS, according to electric network impedance ZSObtain grid current harmonic content Ish_rmsLetter with harmonic wave resistance r
Number relation, and the passive part impedance Z according to mixing dynamic reactive compensation deviceCThe reactive current harmonic wave obtaining power network current contains
Amount Ich_rmsWith the functional relationship of harmonic wave resistance r, then according to grid current harmonic content Ish_rmsClose with the function of harmonic wave resistance r
System, reactive current harmonic content I of power network currentch_rmsWith the functional relationship of harmonic wave resistance r and the harmonic wave of shnt capacitor
Protection demand obtains minimum harmonic wave resistance rmin；
22) consider that current transformer has switch time delay and sampling time delay, obtain the transmission function of harmonic wave resistance, according to described harmonic wave
The transmission function of resistance draws the bode figure of harmonic wave resistance open-loop transfer function, and according to described harmonic wave resistance open-loop transfer function
Bode figure and the durability requirements of system obtain maximum harmonic wave resistance rmax；
23) detect the electric current I of reactive-load compensation branch roadC, obtain a phase current I of reactive-load compensation branch roadCa, b phase current ICbAnd c phase
Electric current ICc, a phase current I of described reactive-load compensation branch roadCa, b phase current ICbAnd c phase current ICcCarry out successively CLARKE conversion,
PARK conversion, low pass filter Filtering Processing, PARK inverse transformation and CLARKE inverse transformation, obtain the current first harmonics of reactive-load compensation branch road
Component ICaf、ICbfAnd ICcf, by a phase current I of reactive-load compensation branch roadCa, b phase current ICbAnd c phase current ICcRespectively with idle benefit
Repay the current first harmonics component I of branch roadCaf、ICbfAnd ICcfSubtract each other, obtain the current harmonics component I of reactive-load compensation branch roadCah、ICbhAnd
ICch, then by the current harmonics component I of reactive-load compensation branch roadCah、ICbhAnd ICchIt is multiplied with default harmonic wave resistance value respectively, obtain
Harmonic voltage instruction Uinvah、UinvbhAnd Uinvch.
With reference to Fig. 1, Fig. 2 and Fig. 3, application in reactive-load compensation for the present invention
When shnt capacitor is in undercompensation working condition all the time, current transformer provides a part of capacitive reactive power capacity, makes up
The not enough reactive capability of shnt capacitor.In Fig. 1, vertical coordinate represents the reactive capability that HDVC can compensate, and wherein positive axis represents appearance
Property is idle, and negative axle represents inductive reactive power；Abscissa represents the group number of input shnt capacitor.Can from Fig. 1 cathetus
Go out, HDVC is capable of idle Continuous Compensation.Wherein, the reactive-load compensator of classification carries out idle coarse adjustment, Δ QPfFor single group simultaneously
The compensation capacity of connection capacitor, current transformer carries out idle fine tuning.When System Reactive Power demand n group and n+1 group shnt capacitor it
Between when, put into n group shnt capacitor, now shnt capacitor is in undercompensation state, then by current transformer compensation low capacity no
Work(, thus reached the purpose of Continuous Var Compensation；
With reference to Fig. 2, when shnt capacitor is in overcompensation working condition all the time, current transformer provides a part of inductive reactive power to hold
Amount, offsets the unnecessary capacitive reactive power capacity of shnt capacitor.As can be seen that HDVC is capable of idle Continuous Compensation in Fig. 2.
When System Reactive Power demand is between n group and n+1 group shnt capacitor capacity, put into n+1 group shnt capacitor, now electricity in parallel
Container is in overcompensation state, the more a small amount of inductive reactive power of compensation by current transformer, thus reaching the purpose of Continuous Var Compensation.
Above two the control of reactive power compensating mode, if load reactive capability fluctuates near N group shnt capacitor capacity
When, for undercompensation control mode, reactive-load compensator can between N-1 group and N group shnt capacitor frequent switching；For overcompensation
Control mode, reactive-load compensator can between N group and N+1 group shnt capacitor frequent switching.Would generally select stagnant under practical situation
Ring controls to carry out the compensation method under shnt capacitor switching, Hysteresis control as shown in figure 3, the shnt capacitor N of input
Group, the capacitive reactive power capacity that now shnt capacitor can provide is N Δ QPf, load reactive capability QLqIn N Δ QPfUp and down
Fluctuation.Work as QLq>N·ΔQPfWhen, HDVC is in undercompensation control mode, and current transformer exports capacitive reactive power all the time；Idle when loading
Capacity QLqContinue to increase up to QLq=(N+1) Δ QPfWhen, put into N+1 group shnt capacitor, control mode need not be compensated and cut
Change.Work as QLq<N·ΔQPfWhen, HDVC is in overcompensation control mode, and current transformer exports inductive reactive power, as load reactive capability QLq
Continue to reduce until waiting QLq=(N-1) Δ QPfWhen, put into N-1 group shnt capacitor, and current transformer still exports perception no
Work(, need not compensate control mode switching.In the shnt capacitor compensation range of N-1 group to N+1 group, shnt capacitor all without
Frequent switching.
Step 21) concrete operations be：Obtain electric network impedance ZSAnd the passive impedance Z of mixing dynamic reactive compensation deviceC,
Further according to electric network impedance ZSAnd the passive impedance Z of mixing dynamic reactive compensation deviceCObtain power network current ISRatio load current ILGainThen according to power network current than load current gain GSAnd each harmonic content in nonlinear load
ILhObtain grid current harmonic content Ish_rms：
Wherein, IshHarmonic current for electrical network；
Idle branch current is than the current gain of loadAccording to idle branch current than load
Current gain GCAnd each harmonic content I in nonlinear loadLhObtain reactive current harmonic content Ich_rms：
Wherein, IchFor idle branch individual harmonic current；
Demand is protected to obtain minimum harmonic wave resistance r according to formula (1), formula (2) and Shunt Capacitor Harmonicmin.
Step 22) concrete operations be：Consider that current transformer has switch time delay and sampling time delay, the transmission letter of harmonic wave resistance
Number is：
Wherein, TwFor switch periods, TsFor the sampling period, s is complex frequency variable, and r is harmonic wave resistance；
Harmonic wave resistance open-loop transfer function is calculated according to transmission function r (s) of described harmonic wave resistance：
Draw the bode figure of harmonic wave resistance open-loop transfer function, and the bode according to described harmonic wave resistance open-loop transfer function
Figure and system stability demand obtain maximum harmonic wave resistance rmax.
Claims (3)
1. a kind of mixing dynamic reactive compensating method with resonance suppression function is it is characterised in that suppressed based on having resonance
The mixing dynamic reactive compensation device of function, the described mixing dynamic reactive compensation device with resonance suppression function include according to
The secondary current transformer being connected in series and reactive-load compensator；Reactive-load compensator includes some reactive-load compensation branch roads being connected in parallel, respectively
Reactive-load compensation branch road is formed by being sequentially connected the switch connecing, capacitor and inductance；
Comprise the following steps：
1) detect load current, and obtain the idle component of load current according to described load current by idle detection algorithm, then
Reactive capability according to load controls the switch in each reactive-load compensation branch road in reactive-load compensator to carry out reactive-load compensator and unsteady flow
The compensation capacity distribution of device, obtains the passive impedance of reactive-load compensation branch road, then the passive impedance according to described reactive-load compensation branch road
U is instructed by the fundamental voltage idle component that idle computational methods obtain current transformerinvfaq、UinvfbqAnd Uinvfcq；
2) detect the electric current of reactive-load compensation branch road, and obtained no by Harmonic Detecting Algorithm according to the electric current of described reactive-load compensation branch road
Work(compensates the harmonic current of branch road, then obtains current transformer according to the harmonic current of default harmonic wave resistance and reactive-load compensation branch road
Harmonic voltage instruction Uinvah、UinvbhAnd Uinvch；
3) detect the DC voltage of current transformer, obtain the DC voltage of current transformer and the difference of preset voltage value, Ran Hougen
Obtain the fundamental wave electricity of current transformer according to the DC voltage of current transformer and the difference of preset voltage value by DC voltage closed loop control
It is pressed with work(component instruction Uinvfap、UinvfbpAnd Uinvfcp；
4) by step 1) the fundamental voltage idle component instruction U of the current transformer that obtainsinvfaq、UinvfbqAnd Uinvfcq, step 2) obtain
Current transformer harmonic voltage instruction Uinvah、UinvbhAnd Uinvch, and step 3) obtain fundamental voltage real component instruction
Uinvfap、UinvfbpAnd UinvfcpIt is added, obtain the AC voltage instruction U of current transformerinva、UinvbAnd Uinvc, then according to described change
The AC voltage instruction U of stream deviceinva、UinvbAnd UinvcControl the AC voltage of current transformer through AC voltage close loop.
2. the mixing dynamic reactive compensating method with resonance suppression function according to claim 1 is it is characterised in that walk
The concrete operations of rapid 1) are：
11) detect load current, obtain a phase current I loadingLa, b phase current ILbAnd c phase current ILc, by a phase current of load
ILa, b phase current ILbAnd c phase current ILcCarry out CLARKE conversion, PARK conversion and low pass filter Filtering Processing successively, obtain
Real component I under rest frame for the load currentLdWith idle component ILq, then by load current under rest frame
To idle component ILqCarry out PARK inverse transformation and CLARKE inverse transformation successively, obtain load current idle under natural system of coordinates
Component ILqa、ILqbAnd ILqc；
12) according to step 11) load current that obtains idle component I under natural system of coordinatesLqa、ILqbAnd ILqcControl each nothing
The switch that work(compensates in branch road completes reactive-load compensator and the distribution of current transformer compensation capacity, obtains the shnt capacitor group of input；
13) obtain mixing the passive part impedance Z of dynamic reactive compensation device according to the shnt capacitor group putting intoC, then basis
The passive part impedance Z of mixing dynamic reactive compensation deviceC, PCC point line voltage USWith load current idle component ILqPass through
Idle algorithm obtains the fundamental voltage idle component instruction U of current transformerinvfaq、UinvfbqAnd Uinvfcq.
3. the mixing dynamic reactive compensating method with resonance suppression function according to claim 2 is it is characterised in that walk
The concrete operations of rapid 2) are：
21) obtain electric network impedance ZS, according to electric network impedance ZSObtain grid current harmonic content Ish_rmsClose with the function of harmonic wave resistance r
System, and the passive part impedance Z according to mixing dynamic reactive compensation deviceCObtain the reactive current harmonic content of power network current
Ich_rmsWith the functional relationship of harmonic wave resistance r, then according to grid current harmonic content Ish_rmsClose with the function of harmonic wave resistance r
System, reactive current harmonic content I of power network currentch_rmsWith the functional relationship of harmonic wave resistance r and the harmonic wave of shnt capacitor
Protection demand obtains minimum harmonic wave resistance rmin；
22) consider that current transformer has switch time delay and sampling time delay, obtain the transmission function of harmonic wave resistance, according to described harmonic wave resistance
Transmission function draw the bode figure of harmonic wave resistance open-loop transfer function, and according to described harmonic wave resistance open-loop transfer function
The durability requirements of bode figure and system obtain maximum harmonic wave resistance rmax；
23) detect the electric current I of reactive-load compensation branch roadC, obtain a phase current I of reactive-load compensation branch roadCa, b phase current ICbAnd c phase current
ICc, a phase current I of described reactive-load compensation branch roadCa, b phase current ICbAnd c phase current ICcCarry out CLARKE conversion successively, PARK becomes
Change, low pass filter Filtering Processing, PARK inverse transformation and CLARKE inverse transformation, obtain the current first harmonics component of reactive-load compensation branch road
ICaf、ICbfAnd ICcf, by a phase current I of reactive-load compensation branch roadCa, b phase current ICbAnd c phase current ICcProp up with reactive-load compensation respectively
The current first harmonics component I on roadCaf、ICbfAnd ICcfSubtract each other, obtain the current harmonics component I of reactive-load compensation branch roadCah、ICbhAnd ICch, so
Afterwards by the current harmonics component I of reactive-load compensation branch roadCah、ICbhAnd ICchIt is multiplied with default harmonic wave resistance value respectively, obtain harmonic wave electricity
Pressure instruction Uinvah、UinvbhAnd Uinvch.
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| RU2745329C1 (en) * | 2020-04-14 | 2021-03-24 | Дмитрий Иванович Панфилов | Three-phase static power compensator |
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| RU2677862C1 (en) * | 2018-04-06 | 2019-01-22 | Акционерное общество "Энергетический институт им. Г.М. Кржижановского" (АО "ЭНИН") | Method of management of thyristor-switched capacitor group and device for its implementation |
| RU2683964C1 (en) * | 2018-04-06 | 2019-04-03 | Акционерное общество "Энергетический институт им. Г.М. Кржижановского" (АО "ЭНИН") | Method of controlling of capacitance of controlled capacitor group and device for its implementation |
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| RU2730178C1 (en) * | 2020-03-27 | 2020-08-19 | Публичное акционерное общество энергетики и электрификации "Ленэнерго" (ПАО "Ленэнерго") | Control method of reactive power compensator operation mode, which is built on the basis of thyristor-switched capacitor group |
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