CN102195288B - Active tuning type hybrid filter and control method of active tuning - Google Patents
Active tuning type hybrid filter and control method of active tuning Download PDFInfo
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- CN102195288B CN102195288B CN2011101331313A CN201110133131A CN102195288B CN 102195288 B CN102195288 B CN 102195288B CN 2011101331313 A CN2011101331313 A CN 2011101331313A CN 201110133131 A CN201110133131 A CN 201110133131A CN 102195288 B CN102195288 B CN 102195288B
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Abstract
The invention discloses an active tuning type hybrid filter, which is characterized in that the output of an APF (active power filter) is directly connected with two ends of a filter reactor L of a PPF (passive power filter) in parallel (or by a coupling transformer in parallel). The invention also discloses a control method of active tuning, which comprises the following steps by using the hybrid filter: connecting a branch with a linear load required to filter in parallel; obtaining each single harmonic current component to be filtered by detecting a harmonic current; comparing a condenser voltage with a reactor voltage and then carrying out PI adjustment so as to obtain the detuning degree under the condition of the frequency of harmonic to be filtered; generating the detuning degree into a harmonic compensating current weighting coefficient; forming a harmonic compensating current command; generating an active current command of fundamental waves; summing to obtain a command current of the APF; and generating a PWM (pulse-width modulation) drive signal after the command current and an actually-output current signal are subjected to PWM generation and drive. The method is remarkable, safe and reliable.
Description
Technical field
The invention belongs to the electric filtering technical field, relate to a kind of active tuning type compound filter, the invention still further relates to this active tuning type compound filter is carried out active tuning control method.
Background technology
Along with the extensive use of large-capacity power electronic installation and various electronic equipments, harmonic pollution in electric power net is day by day serious, and this had both threatened the safe operation of electric power system and electric equipment, has also enlarged markedly the electric energy loss of electrical network.Harmonic decrease devices can be divided into the mixed electric power filter (hereinafter to be referred as compound filter or HPF) that passive power filter (hereinafter to be referred as passive filter or PPF), Active Power Filter-APF (hereinafter to be referred as active filter or APF) and the two combination form.
The passive filter that uses separately or active filter all exist problem separately in actual applications.Passive filter is the conventional equipment of harmonic wave control, and it is simple in structure, with low cost and have the double action that suppresses harmonic wave and compensating reactive power, but normal larger off resonance, the difficult to the greatest extent people's will of filter effect of existing.Active filter is the new force of harmonic wave control, simultaneously filtering harmonic wave below 25 times, function admirable, adaptive capacity to environment is strong, but owing to be subject to the restriction of power electronic device voltage and current level, there is the problem that voltage is low, capacity is little, is greatly limited in actual applications.
Compound filter combines the features of passive filter and active filter, utilize the flexible control function of low pressure low capacity active power filtering part, having improved filtering characteristic and the effect of high-voltage large-capacity passive filter, is an important development direction of following filtering technique.Done with regard to compound filter both at home and abroad and comparatively goed deep into systematic research, up to the present the circuit topological structure of three kinds of typical parallel hybrid filtering devices has been proposed, 1) basic model, its design feature are that active filter (APF) is connected with passive filter (PPF); 2) modified model, first-harmonic resonance circuit in parallel in the coupling transformer of APF is in order to reduce the fundamental voltage that APF bears; 3) current-injecting, the harmonic compensation current that APF produces is by capacitor (C
21) be injected in the electrical network L
2With C
22Form the first-harmonic resonance circuit, the fundamental voltage that bears to reduce APF.But all also there is certain shortcoming in above-mentioned several compound filters: 1) need detection load electric current or source current as feedback signal, be not suitable for being applied to containing the improvement of the distribution system harmonic wave of distributed power source or distribution type non-linear load; 2) active power filtering part capacity relative is larger; 3) the unified control of three-phase, its performance is vulnerable to the impact of three-phase LC parameter unbalance; 4) do not consider the harmonic wave current-limiting protection problem of passive filter.
Summary of the invention
The purpose of this invention is to provide a kind of active tuning type compound filter, solve in the prior art existing detection load electric current or the source current of needing as feedback signal, be not suitable for being applied to containing the improvement of the distribution system harmonic wave of distributed power source or distribution type non-linear load; Active power filtering part capacity relative is larger; The unified control of three-phase, its performance is vulnerable to the impact of three-phase LC parameter unbalance; Do not consider the problem of the harmonic wave current-limiting protection of passive filter.
Another object of the present invention provides a kind ofly carries out active tuning control method to aforesaid active tuning type compound filter, to realize the technical characteristic of above-mentioned active tuning type compound filter, is used for the harmonic wave of electrical network is administered.
The technical solution adopted in the present invention is, a kind of active tuning type compound filter, its characteristics are: include source filter APF and passive filter PPF, the output of active filter APF directly is parallel to the two ends of the filter reactor L of passive filter PPF, perhaps the output of active filter APF is parallel to the two ends of the filter reactor L of passive filter PPF by coupling transformer
Described passive filter PPF comprises that a filtering capacitor C and a filter reactor L are in series; Described active filter APF is based on the voltage source inverter of IGBT device and PWM modulation technique formation.
Another technical scheme of the present invention is, a kind of active tuning type compound filter carried out active tuning control method, and the method is utilized a kind of active tuning type compound filter, and its structure is,
Include source filter APF and passive filter PPF, the output of active filter APF directly is parallel to the two ends of the filter reactor L of passive filter PPF, and perhaps the output of active filter APF is parallel to the two ends of the filter reactor L of passive filter PPF by coupling transformer; Described passive filter PPF comprises that a filtering capacitor C and a filter reactor L are in series; Described active filter APF is based on the voltage source inverter of IGBT device and PWM modulation technique formation,
Described active tuning type compound filter also comprises current detector TA1, current detector TA2, voltage detector TV1, voltage detector TV2 and voltage detector TV3, current detecting unit I, current detecting unit II, voltage detection unit I, voltage detection unit II, voltage detection unit III, harmonic current detection, the detection of off resonance degree, multiple-harmonic adjuster, weighting filter, adder unit, comparing unit, voltage regulator, PWM occur and drive
The primary side of current detector TA1 is connected with the filter reactor L outer end of LC passive filtering branch road, among the secondary side access current detecting unit I of current detector TA1; The primary side of current detector TA2 is series in the output loop of active filter APF, among the secondary side of the current detector TA2 access current detecting unit II; The primary side of voltage detector TV1 is connected to the filtering capacitor C two ends of Passive LC filter branch, the primary side of voltage detector TV2 is connected to the filter reactor L two ends of Passive LC filter branch, among the secondary side access voltage detection unit II of voltage detector TV1, among the secondary side access voltage detection unit I of voltage detector TV2; The primary side of voltage detector TV3 is connected to the DC side of active filter APF, among the secondary side access voltage detection unit III of voltage detector TV3;
The output of voltage detection unit I is connected with the input that the off resonance degree detects; The output of voltage detection unit II is connected with another input that the off resonance degree detects; During the output access harmonic current of current detecting unit I detected, the output that harmonic current detects accessed in the weighting filter accordingly;
The output while that the output of current detecting unit I is connected with the off resonance degree and the corresponding connection of input of multiple-harmonic adjuster, the output of multiple-harmonic adjuster is connected with the input of weighting filter accordingly; The output of weighting filter links to each other with an input of adder unit;
Voltage detection unit III is connected with an input of comparing unit; Another input of comparing unit is direct voltage reference value given in the software program; Comparing unit access voltage regulator, the output of voltage regulator is connected with another input of adder unit;
The input that current detecting unit II access PWM occurs and drives; Another input that the output of adder unit access PWM occurs and drives, PWM occur and the output that drives directly links to each other with IGBT device among the active filter APF,
Utilize aforesaid active tuning type compound filter, implement according to following steps:
Step 1) active tuning type compound filter of the present invention is in parallel with the required nonlinear load that carries out filtering;
Step 2) by current detector TA1, voltage detector TV1 and voltage detector TV2, respectively electric current, condenser voltage and reactor voltage in the passive filter PPF branch road are detected, obtain corresponding current and voltage signals i
f, u
CAnd u
L
Step 3) current i in the passive filter PPF branch road
fDetect through harmonic current, obtain intending each single harmonic current component i of filtering
H.l～i
H.m
Step 4) to condenser voltage u in the passive filter PPF branch road
CWith reactor voltage u
L, detect analysis meter by the off resonance degree and calculate passive filter PPF at the off resonance degree d that intends under the filtering harmonic frequency
H.l～d
H.m
Step 5) the off resonance degree d that is obtained by step 4
H.l～d
H.m, by the multiple-harmonic adjuster, generate harmonic compensation current weight coefficient k
1～k
m
Step 6) by weighting filter, according to harmonic current components i
H.l～i
H.mWith weight coefficient k
1～k
mBe weighted summation and process, be formed with the harmonic compensation current instruction i of source filter APF
Ch.ref
Step 7) by voltage detector TV3, with the direct voltage actual value U of the resulting active filter APF of voltage detection unit III
DcWith direct voltage set point U
Dc.ref, through comparing unit and voltage regulator, with U
DcWith U
Dc.refDifference carry out PI and regulate, generate fundamental active current instruction i
Dc.ref
Step 8) for the harmonic compensation current instruction i of active filter APF
Ch.refWith fundamental active current instruction i
Dc.ref, by adder unit the two is carried out summation operation, finally obtain the instruction current i of active filter APF
APF.ref
Step 9) actual output current of active filter APF obtains the actual output current signal i of active filter APF behind over-current detector TA2 and current detecting unit II
APF.real
Step 10) with the instruction current i of active filter APF
APF.refActual output current signal i with active filter APF
APF.real, after the PWM generation and driving processing, produce the PWM driving signal of the IGBT that consists of active filter APF.
The invention has the beneficial effects as follows: can be applicable to various distribution systems, comprise the intelligent distribution network that contains distributed power source and distribution type non-linear load; The APF voltage stress is low, capacity is little; The Three-phase electric-wave filter phase-splitting is independently regulated and control, and is not subjected to the impact of three-phase LC parameter unbalance; The compensation harmonic number of times is optional, is conducive to the parallel connection of many filter branch, reduces the capacity of APF in each branch road; Can realize harmonic wave current-limiting protection.
Description of drawings
Fig. 1 is the structural representation of existing basic model compound filter;
Fig. 2 is the structural representation of existing modified model compound filter;
Fig. 3 is the structural representation of existing current-injecting compound filter;
Fig. 4 is that active tuning type compound filter of the present invention adopts the directly structural representation of parallel connection of active power filtering part;
Fig. 5 is that active tuning type compound filter of the present invention adopts active power filtering partly to pass through the structural representation of coupling transformer parallel connection;
Fig. 6 is the control method theory diagram of the active tuning type compound filter of the present invention;
Fig. 7 is that harmonic wave overcurrent flexible protective function of the present invention realizes block diagram;
Fig. 8 is A phase power network current before active tuning type compound filter of the present invention does not come into operation the time and the simulation waveform figure of 5 times and 7 order harmonic components thereof;
Oscillogram when Fig. 9 does not work for only dropping into the passive filter active filter;
Figure 10 is after active tuning type compound filter of the present invention all comes into operation, and the simulation waveform figure of active filter when simultaneously double tunning is carried out in 5 times in the system and 7 loads.
Among the figure, 1. current detecting unit I, 2. harmonic current detects, 3. voltage detection unit I, 4. voltage detection unit II, 5. the off resonance degree detects, 6. multiple-harmonic adjuster, 7. weighting filter, 8. current detecting unit II, 9. adder unit, 10. voltage detection unit III, 11. comparing units, 12. voltage regulator, 13.PWM occur and driving, 14. active power filtering parts, 15. cross throttle regulator.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1-Figure 3, be respectively the circuit topological structure schematic diagram of three kinds of typical compound filters of prior art.Wherein, Fig. 1 is basic model, and its design feature is that active filter APF connects with passive filter PPF; Fig. 2 is modified model, and first-harmonic resonance circuit in parallel in the coupling transformer of active filter APF is in order to reduce the fundamental voltage that APF bears; Fig. 3 is current-injecting, and the harmonic compensation current that active filter APF produces is by capacitor C
21Be injected in the electrical network L
2With C
22Form the first-harmonic resonance circuit, the fundamental voltage that bears to reduce active filter APF.
With reference to Fig. 4, Fig. 5, Fig. 6, the structure of compound filter of the present invention is, comprise active filtering part 14 and passive filter PPF, be provided with an active filter APF in the active power filtering part 14, described active filter APF is based on the voltage source inverter VSI of insulated gate bipolar transistor IGBT (Insulated Gate Bipolar Transistor) and PWM modulation technique formation; Described passive filter PPF comprises that a filtering capacitor C and a filter reactor L are in series, and are called the Passive LC filter branch; The output of active filter APF is (referring to Fig. 4) or be parallel to the two ends of filter reactor L by coupling transformer (referring to Fig. 5) directly, this branch road and treat that the nonlinear load of filtering harmonic wave is connected in parallel.Passive filter PPF branch road is as the major avenues of approach of load harmonic wave, and active filter APF then plays tuning control action, makes the Passive LC filter branch can both play good filter action to selected a plurality of specific subharmonic.
With reference to Fig. 6, also comprise current detector TA1, current detector TA2, voltage detector TV1, voltage detector TV2 and voltage detector TV3 in the compound filter of the present invention; Also comprise current detecting unit I1, harmonic current detection 2, voltage detection unit I3, voltage detection unit II4, off resonance degree detection 5, multiple-harmonic adjuster 6, weighting filter 7, current detecting unit II8, adder unit 9, voltage detection unit III10, comparing unit 11, voltage regulator 12 (AVR), PWM generation in the active power filtering part 14 in the described compound filter and drive 13
Current detector TA1 and current detector TA2 are current transformer, and the primary side of current detector TA1 is connected with the filter reactor L outer end of LC passive filtering branch road, among the secondary side access current detecting unit I1 of current detector TA1; The primary side of current detector TA2 is series in the output loop of active filter APF, among the secondary side of the current detector TA2 access current detecting unit II8; Voltage detector TV1 and voltage detector TV2 are voltage transformer, the primary side of voltage detector TV1 is connected to the filtering capacitor C two ends of Passive LC filter branch, the primary side of voltage detector TV2 is connected to the filter reactor L two ends of Passive LC filter branch, among the secondary side access voltage detection unit II4 of voltage detector TV1, among the secondary side access voltage detection unit I3 of voltage detector TV2; Voltage detector TV3 is the direct voltage Hall element, and the primary side of voltage detector TV3 is connected to the DC side of active filter APF, among the secondary side access voltage detection unit III10 of voltage detector TV3;
The output of voltage detection unit I3 is connected with an input of off resonance degree detection 5; The output of voltage detection unit II4 is connected with another input of off resonance degree detection 5; The output access harmonic current of current detecting unit I1 detects in 2, and the output of harmonic current detection 2 accesses in the weighting filter 7 accordingly;
The output of current detecting unit I1 be connected with the off resonance degree 5 output simultaneously with the corresponding connection of input of multiple-harmonic adjuster 6, the output of multiple-harmonic adjuster 6 is connected with the input of weighting filter 7 accordingly; The output of weighting filter 7 links to each other with an input of adder unit 9;
Voltage detection unit III10 is connected with an input of comparing unit 11, is used for picking up the dc voltage signal of active filter APF; Another input of comparing unit 11 is direct voltage reference value given in the software program; Comparing unit 11 access voltage regulators 12, the output of voltage regulator 12 is connected with another input of adder unit 9;
Current detecting unit II8 access PWM occurs and drives an input of 13, mainly is the actual compensating current signal that detection system active power filtering part sends; The output of adder unit 9 access PWM occurs and drives another input of 13, and PWM occurs and drive 13 output directly to link to each other with IGBT device among the active filter APF.
With reference to Fig. 6, the present invention is directed to the active tuning control method that Fig. 4 and compound filter shown in Figure 5 carry out, implement according to following steps:
Step 1) active tuning type compound filter of the present invention is in parallel with the required nonlinear load that carries out filtering, or with active tuning type compound filter of the present invention directly and receive in the power distribution network that needs filtering;
Step 2) by current detector TA1, voltage detector TV1 and voltage detector TV2, respectively electric current, condenser voltage and reactor voltage in the passive filter PPF branch road are detected, obtain corresponding current and voltage signals i
f, u
CAnd u
L
Step 3) current i in the passive filter PPF branch road
fDetect 2 through harmonic current, obtain intending each single harmonic current component i of filtering
H.l～i
H.m
Step 4) to condenser voltage u in the passive filter PPF branch road
CWith reactor voltage u
L, detect 5 analysis meters by the off resonance degree and calculate passive filter PPF at the off resonance degree d that intends under the filtering harmonic frequency
H.l～d
H.m
Step 5) the off resonance degree d that is obtained by step 4
H.l～d
H.m, by multiple-harmonic adjuster 6, generate harmonic compensation current weight coefficient k
1～k
m
Step 6) by weighting filter 7, according to harmonic current components i
H.l～i
H.mWith weight coefficient k
1～k
mBe weighted summation and process, be formed with the harmonic compensation current instruction i of source filter APF
Ch.ref
Step 7) by voltage detector TV3, with the direct voltage actual value U of the resulting active filter APF of voltage detection unit III10
DcWith direct voltage set point U
Dc.ref, through comparing unit 11 and voltage regulator 12, with U
DcWith U
Dc.refDifference carry out PI and regulate, generate fundamental active current instruction i
Dc.ref
Step 8) for the harmonic compensation current instruction i of active filter APF
Ch.refWith fundamental active current instruction i
Dc.ref, by adder unit 9 the two is carried out summation operation, finally obtain the instruction current i of active filter APF
APF.ref
Step 9) actual output current of active filter APF obtains the actual output current signal i of active filter APF behind over-current detector TA2 and current detecting unit II8
APF.real
Step 10) with the instruction current i of active filter APF
APF.refActual output current signal i with active filter APF
APF.real, after the PWM generation and driving 13 processing, the PWM that produces the IGBT that consists of active filter APF drives signal.
Referring to Fig. 7; throttle regulator 15 was crossed in one of access between multiple-harmonic adjuster 6 in the active tuning type compound filter of the present invention and off resonance degree detected 5; so that the tuning type compound filter of integrated active has also had harmonic wave current-limiting protection function, its concrete enforcement principle is:
In the situation of active tuning type compound filter without overcurrent, the off resonance degree reference signal of crossing throttle regulator output is 0, makes capacitor C and the two complete tuning filtering of reactor L in the active tuning type compound filter; When active tuning type compound filter generation harmonic wave overcurrent, the off resonance degree reference signal of crossing throttle regulator output progressively increases, by making this active tuning type compound filter initiatively break away from resonance condition after the tuning control, the electric current in the passive filter PPF branch road drops in the reference value in this active tuning type compound filter until flow through, and the method specifically may further comprise the steps:
1) by current detecting unit I the electric current in the passive filter PPF branch road is detected, obtain the current signal i of filter
f
2) to current signal i
fCarry out effective value and calculate, and with the current reference value i that sets
F.refRelatively make it poor;
3) cross throttle regulator by one, regulate calculating according to the difference of the two, export an off resonance degree reference signal d
H.ref, when active tuning type compound filter during normally without overcurrent, cross the output d of throttle regulator
H.refBe defined as a default null value; When the harmonic wave overcurrent occurs active tuning type compound filter for a certain reason, cross the output d of throttle regulator
H.refProgressively increase;
4) because d
H.refIncrease, by multiple-harmonic adjuster 6 so that filter initiatively move back humorous, with the filter current limit within current reference value.
The simulation waveform figure of the A phase power network current when Figure 8 shows that before active tuning type compound filter does not come into operation and 5 times and 7 order harmonic components; Fig. 9 and Figure 10 are the A simulation waveform figure of power network current and 5 times and 7 order harmonic components mutually after active tuning type compound filter comes into operation, Figure 9 shows that wherein and only drop into passive filter and the waveform of active filter when not working that Figure 10 is after active tuning type compound filter of the present invention all comes into operation and the simulation waveform figure of active filter when simultaneously double tunning is carried out in 5 times in the system and 7 loads.Contrast Fig. 8, Fig. 9 and Figure 10, the filter effect of visible active tuning type compound filter of the present invention is good.
The advantage of compound filter of the present invention is,
1) active filter APF is parallel to the two ends of the filter reactor L of passive filter PPF.Active filter APF can regard a kind of virtual reactor that has the different induction value under different harmonic frequencies as, size by each harmonic component in the control active filter APF output current, can regulate the virtual inductor of virtual reactor under the each harmonic frequency, thereby so that the active tuning type compound filter that virtual reactor and passive filter PPF form is tuned in selected each harmonic fully, realized the good filter function of wall scroll LC branch road to multiple harmonic.
2) needs detects the voltage and current of active tuning type compound filter itself, do not need detection load electric current and source current, can compensate its all harmonic-producing loads that access front and back, electrical network place, can be applicable to any system, as contain the electrical power trans mission/distribution system of distributed power source and distribution type non-linear load.
3) active filter APF capacity is little.Active filter APF is in parallel with filter reactor L, and the fundamental voltage that bears is low, and does not flow through fundamental current.For containing 5 times and the distribution system of above harmonic wave, the first-harmonic of active filter APF is withstand voltage only to be about 4% of electrical network rated voltage, and electric current is about 50% of passive filter harmonic current.If total harmonic current of active tuning type compound filter accounts for 50% of fundamental current, then the capacity of active power filtering part is about 1%～2% of passive filter PPF capacity.
4) have phase separation structure, but phase-splitting independently control, its performance is not subjected to the impact of three-phase LC parameter unbalance; Can implement harmonic wave current-limiting protection, because active filter APF adopts tuning control strategy, when the harmonic wave overcurrent, can take the harmonic wave overcurrent flexible protective strategy of " initiatively moving back humorous ".
Claims (4)
1. active tuning type compound filter, its characteristics are: include source filter APF and passive filter PPF, the output of active filter APF directly is parallel to the two ends of the filter reactor L of passive filter PPF,
Described passive filter PPF comprises that a filtering capacitor C and a filter reactor L are in series; Described active filter APF is based on the voltage source inverter of IGBT device and PWM modulation technique formation;
Described active tuning type compound filter also comprises current detector TA1, current detector TA2, voltage detector TV1, voltage detector TV2 and voltage detector TV3, current detecting unit I, current detecting unit II, voltage detection unit I, voltage detection unit II, voltage detection unit III, harmonic current detects (2), the off resonance degree detects (5), multiple-harmonic adjuster (6), weighting filter (7), adder unit (9), comparing unit (11), voltage regulator (12), PWM occurs and driving (13)
The primary side of current detector TA1 is connected with the filter reactor L outer end of LC passive filtering branch road, among the secondary side access current detecting unit I of current detector TA1; The primary side of current detector TA2 is series in the output loop of active filter APF, among the secondary side of the current detector TA2 access current detecting unit II; The primary side of voltage detector TV1 is connected to the filtering capacitor C two ends of LC passive filtering branch road, the primary side of voltage detector TV2 is connected to the filter reactor L two ends of LC passive filtering branch road, among the secondary side access voltage detection unit II of voltage detector TV1, among the secondary side access voltage detection unit I of voltage detector TV2; The primary side of voltage detector TV3 is connected to the DC side of active filter APF, among the secondary side access voltage detection unit III of voltage detector TV3;
The output of voltage detection unit I is connected with the input that the off resonance degree detects (5); The output of voltage detection unit II is connected with another input that the off resonance degree detects (5); The output access harmonic current of current detecting unit I detects in (2), and the output that harmonic current detects (2) accesses in the weighting filter (7) accordingly;
The output of current detecting unit I is connected the output while of (5) and the corresponding connection of input of multiple-harmonic adjuster (6) with the off resonance degree, the output of multiple-harmonic adjuster (6) is connected with the input of weighting filter (7) accordingly; The output of weighting filter (7) links to each other with an input of adder unit (9);
Voltage detection unit III is connected with an input of comparing unit (11); Another input of comparing unit (11) is direct voltage reference value given in the software program; Comparing unit (11) access voltage regulator (12), the output of voltage regulator (12) is connected with another input of adder unit (9);
An input of (13) occurs and drives in current detecting unit II access PWM; Another input of (13) occurs and drives in the output of adder unit (9) access PWM, and PWM occurs and the output that drives (13) directly links to each other with IGBT device among the active filter APF.
2. active tuning type compound filter according to claim 1, its characteristics are: the output of described active filter APF is parallel to the two ends of the filter reactor L of passive filter PPF by coupling transformer.
3. one kind is carried out active tuning control method to active tuning type compound filter, it is characterized in that the method is utilized a kind of active tuning type compound filter, and its structure is,
Include source filter APF and passive filter PPF, the output of active filter APF directly is parallel to the two ends of the filter reactor L of passive filter PPF, and perhaps the output of active filter APF is parallel to the two ends of the filter reactor L of passive filter PPF by coupling transformer; Described passive filter PPF comprises that a filtering capacitor C and a filter reactor L are in series; Described active filter APF is based on the voltage source inverter of IGBT device and PWM modulation technique formation,
Described active tuning type compound filter also comprises current detector TA1, current detector TA2, voltage detector TV1, voltage detector TV2 and voltage detector TV3, current detecting unit I, current detecting unit II, voltage detection unit I, voltage detection unit II, voltage detection unit III, harmonic current detects (2), the off resonance degree detects (5), multiple-harmonic adjuster (6), weighting filter (7), adder unit (9), comparing unit (11), voltage regulator (12), PWM occurs and driving (13)
The primary side of current detector TA1 is connected with the filter reactor L outer end of LC passive filtering branch road, among the secondary side access current detecting unit I of current detector TA1; The primary side of current detector TA2 is series in the output loop of active filter APF, among the secondary side of the current detector TA2 access current detecting unit II; The primary side of voltage detector TV1 is connected to the filtering capacitor C two ends of Passive LC filter branch, the primary side of voltage detector TV2 is connected to the filter reactor L two ends of Passive LC filter branch, among the secondary side access voltage detection unit II of voltage detector TV1, among the secondary side access voltage detection unit I of voltage detector TV2; The primary side of voltage detector TV3 is connected to the DC side of active filter APF, among the secondary side access voltage detection unit III of voltage detector TV3;
The output of voltage detection unit I is connected with the input that the off resonance degree detects (5); The output of voltage detection unit II is connected with another input that the off resonance degree detects (5); The output access harmonic current of current detecting unit I detects in (2), and the output that harmonic current detects (2) accesses in the weighting filter (7) accordingly;
The output of current detecting unit I is connected the output while of (5) and the corresponding connection of input of multiple-harmonic adjuster (6) with the off resonance degree, the output of multiple-harmonic adjuster (6) is connected with the input of weighting filter (7) accordingly; The output of weighting filter (7) links to each other with an input of adder unit (9);
Voltage detection unit III is connected with an input of comparing unit (11); Another input of comparing unit (11) is direct voltage reference value given in the software program; Comparing unit (11) access voltage regulator (12), the output of voltage regulator (12) is connected with another input of adder unit (9);
An input of (13) occurs and drives in current detecting unit II access PWM; Another input of (13) occurs and drives in the output of adder unit (9) access PWM, and PWM occurs and the output that drives (13) directly links to each other with IGBT device among the active filter APF,
Utilize aforesaid active tuning type compound filter, implement according to following steps:
Step 1) is in parallel with the required nonlinear load that carries out filtering with active tuning type compound filter;
Step 2) by current detector TA1, voltage detector TV1 and voltage detector TV2, respectively electric current, condenser voltage and reactor voltage in the passive filter PPF branch road are detected, obtain corresponding current and voltage signals i
f, u
CAnd u
L
Current i in the step 3) passive filter PPF branch road
fDetect (2) through harmonic current, obtain intending each single harmonic current component i of filtering
H.1～i
H.m
Step 4) is to condenser voltage u in the passive filter PPF branch road
CWith reactor voltage u
L, detect (5) analysis meter by the off resonance degree and calculate passive filter PPF at the off resonance degree d that intends under the filtering harmonic frequency
H.1～d
H.m
The off resonance degree d that step 5) is obtained by step 4
H.1～d
H.m, by multiple-harmonic adjuster (6), generate harmonic compensation current weight coefficient k
1～k
m
Step 6) is by weighting filter (7), according to harmonic current components i
H.1～i
H.mWith weight coefficient k
1～k
mBe weighted summation and process, be formed with the harmonic compensation current instruction i of source filter APF
Ch.ref
Step 7) is by voltage detector TV3, with the direct voltage actual value U of the resulting active filter APF of voltage detection unit III
DcWith direct voltage reference value U
Dc.ref, through comparing unit (11) and voltage regulator (12), with U
DcWith U
Dc.refDifference carry out PI and regulate, generate fundamental active current instruction i
Dc.ref
Step 8) is for the harmonic compensation current instruction i of active filter APF
Ch.refWith fundamental active current instruction i
Dc.ref, by adder unit (9) the two is carried out summation operation, finally obtain the instruction current i of active filter APF
APF.ref
The actual output current of step 9) active filter APF obtains the actual output current signal i of active filter APF behind over-current detector TA2 and current detecting unit II
APF.real
Step 10) is with the instruction current i of active filter APF
APF.refActual output current signal i with active filter APF
APF.real, after the PWM generation and driving (13) processing, produce the PWM driving signal of the IGBT that consists of active filter APF.
4. control method according to claim 3 is characterized in that, throttle regulator (15) is crossed in access one between described multiple-harmonic adjuster (6) and the off resonance degree detection (5), can also carry out harmonic wave current-limiting protection, and implementation is:
In the situation of active tuning type compound filter without overcurrent, the off resonance degree reference signal of crossing throttle regulator output is 0, makes capacitor C and the two complete tuning filtering of reactor L in the active tuning type compound filter; When active tuning type compound filter generation harmonic wave overcurrent, the off resonance degree reference signal of crossing throttle regulator output progressively increases, by making this active tuning type compound filter initiatively break away from resonance condition after the tuning control, the electric current in the passive filter PPF branch road drops in the reference value in this active tuning type compound filter until flow through, and the method specifically may further comprise the steps:
1) by current detecting unit I the electric current in the passive filter PPF branch road is detected, obtain the current signal i of filter
f
2) to current signal i
fCarry out effective value and calculate, and with the current reference value i that sets
F.refRelatively make it poor;
3) passed through throttle regulator (15), according to step 2) in the two difference regulate calculating, export an off resonance degree reference signal d
H.ref, when active tuning type compound filter during normally without overcurrent, cross the output d of throttle regulator
H.refBe defined as a default null value; When the harmonic wave overcurrent occurs active tuning type compound filter for a certain reason, cross the output d of throttle regulator
H.refProgressively increase;
4) because d
H.refIncrease, multiple-harmonic adjuster (6) so that filter initiatively move back humorous, with the filter current limit within current reference value.
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| CN102403957A (en) * | 2011-11-08 | 2012-04-04 | 厦门大学 | Harmonic-free frequency conversion speed adjusting device |
| CN103023033B (en) * | 2013-01-07 | 2014-12-31 | 曹一家 | Transformerless hybrid active power amplifier and implementation and control methods thereof |
| CN103412209B (en) * | 2013-07-18 | 2015-09-30 | 西安理工大学 | A kind of off resonance degree detection method of tuned filter |
| EP2980798A1 (en) * | 2014-07-28 | 2016-02-03 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Harmonicity-dependent controlling of a harmonic filter tool |
| CN105226658B (en) * | 2015-11-13 | 2017-06-27 | 四川英杰电气股份有限公司 | A kind of Active Power Filter-APF and its peak point current method for limiting |
| CN105680827B (en) * | 2015-12-31 | 2018-06-22 | 中国科学院深圳先进技术研究院 | A kind of cavity body filter intelligent tuning algorithm and the tuning methods using the algorithm |
| ITUA20161824A1 (en) * | 2016-03-18 | 2017-09-18 | Eggtronic S R L | CIRCUIT AND METHOD TO DRIVE ELECTRIC LOADS |
| CN107394783A (en) * | 2017-08-22 | 2017-11-24 | 国家电网公司 | The active tuning type compound filter of transformer coupled and separated exciting and control method |
| WO2020023598A1 (en) * | 2018-07-26 | 2020-01-30 | Carrier Corporation | Hybrid active harmonic filter for high current drives |
| CN109167360B (en) * | 2018-08-31 | 2021-07-09 | 山东农业大学 | Electric vehicle charging station filter and parameter design method thereof |
| CN114400642B (en) * | 2022-01-25 | 2023-11-10 | 帝森克罗德集团有限公司 | Harmonic extraction and current limiting method of active power filter |
| CN117477784B (en) * | 2023-11-02 | 2024-06-11 | 淮阴工学院 | Intelligent switch cabinet management system based on Internet of things |
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| CN1527456A (en) * | 2003-09-25 | 2004-09-08 | �Ϻ���ͨ��ѧ | Parallel mixed power filter for electrified railway |
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