CN102510062A - Improved space vector single period control method and device for active power filter - Google Patents

Abstract

The invention belongs to the field of active power filters, and provides an improved space vector single period control method used for simplifying an integral control system. In order to achieve the purpose, the method comprises the following steps: an active power filter main circuit equation based on a single period control idea is simplified; a three-phase power supply voltage zone regionalization condition judgment table is used for judge that a voltage vector of a three-phase AC is located in a zone I, II or III; on-off state da, db or dc of bridge arms on a corresponding phase can be obtained via a judgment result, and an active power filter single period control equation in the zone I, II and III is obtained; Vm is regulated and controlled through that deviation delta vd of the voltage on the active power filter DC side is regulated by proportional integral (PI), and voltage Vd of the DC side is required to be kept during the regulation process, thus a required active power under the current load condition is obtained. The invention is mainly applied in active power wave filtering.

Description

The room for improvement vector monocyclic control method and the device of Active Power Filter-APF

Technical field

The invention belongs to the Active Power Filter-APF field, be specifically related to the room for improvement vector monocyclic control method and the device of Active Power Filter-APF.

Background technology

In harmonic suppressing method; Active Power Filter-APF is compared passive power filter has remarkable advantages; As can compensate simultaneously each harmonic, can carry out real-Time Compensation etc. to the reactive power that changes, make it become the main means of harmonic carcellation gradually.But the traditional active electric-power filter all need detect harmonic current earlier, and then uses the identical with it offset currents of control method output such as hysteresis current control, triangular current control, so the design of The whole control system is comparatively complicated.

Summary of the invention

For overcoming the deficiency of prior art; On traditional Cycle Control basis, further improve; Provide a kind of The whole control system to realize the room for improvement vector monocyclic control method of the Active Power Filter-APF of simplification, for achieving the above object, the technical scheme that the present invention takes is; A kind of room for improvement vector monocyclic control method of Active Power Filter-APF; Realize by means of following array apparatus: three complete emission set pairs of controlling each pipe in the switching tube should be connected on the collector electrode of each pipe in other three switching tubes, and each switching tube forms a brachium pontis, and aforementioned emitter is the mid point that is connected of brachium pontis with the tie point of collector electrode; The emitter of other three switching tubes links together and the resistance through two serial connections is connected on the collector electrode that said three switching tubes link together; The emitter of each switching tube respectively connects the positive pole of a diode, and the negative pole of diode is connected to the collector electrode of the coupled switching tube of emitter, is provided with electric capacity between the said emitter that links together, the collector electrode; Be connected to an aforementioned aforementioned connection mid point through an inductance correspondence respectively mutually to the three-phase alternating current of nonlinear load power supply is every; Three-phase alternating current is every to be connected respectively to based on space vector Cycle Control arithmetic unit mutually, and the tie point between said two resistance also is connected on the said arithmetic unit;

To be based on Cycle Control thought Active Power Filter-APF main circuit equation simplification:

$\left[\begin{array}{c}{v}_{\mathrm{sa}}\\ v_{\mathrm{sb}}\\ v_{\mathrm{sc}}\end{array}\right]=\frac{1}{3}{V}_d\left[\begin{array}{ccc}2& -1& -1\\ -1& 2& -1\\ -1& -1& 2\end{array}\right]\left[\begin{array}{c}{d}_a\\ d_b\\ d_c\end{array}\right]---\left(6\right)$

V in the following formula _Sa, v _Sb, v _ScBe three-phase alternating voltage, d _a, d _bAnd d _cCorrespond to the duty ratio of a brachium pontis above the connection mid point respectively, V _dBe the electric capacity voltage;

Three-phase mains voltage area dividing condition judgment table

The zone	I	II	III
				Condition 1	v sb-v sc＞0	v sc-v sa＞0	v sa-v sb＞0
Condition 2	v sc-v sa≤0	v sa-v sb≤0	v sb-v sc≤0

On off state according to triode is different is formed six fundamental space voltage vector V ₁-V ₆, angle is 60 degree between each space voltage vector, establishes three bit digital and representes the brachium pontis on off operating mode, representes conducting during for " 1 ", is that " 0 " expression turn-offs, first to the 3rd represent three-phase alternating current successively first to the 3rd, and six fundamental space voltage vector V then ₁-V ₆Arrange counterclockwise successively, the brachium pontis on off operating mode that each space voltage vector is corresponding is followed successively by (100), (110), (010), (011), (001), (101), V ₁Counterclockwise to V ₃The zone is interval I, V ₃Counterclockwise to V ₅The zone is interval II, V ₅Counterclockwise to V ₁The zone is interval III, and the voltage vector of being differentiated three-phase alternating current by three-phase mains voltage area dividing condition judgment table is arranged in interval I, II or III, obtains the corresponding brachium pontis on off state d that goes up mutually by differentiating the result _a, d _bOr d _c, and substitution formula (6), obtain at the Active Power Filter-APF Cycle Control equation in I, II, III interval following successively:

$\left\{\begin{array}{c}{d}_a{V}_m=2R_s{i}_{\mathrm{sa}}+R_s{i}_{\mathrm{sb}}\\ d_b{V}_m=2R_s{i}_{\mathrm{sb}}+R_s{i}_{\mathrm{sa}}\\ d_c=0\end{array}\right.---\left(12\right)$

$\left\{\begin{array}{c}{d}_a=0\\ d_b{V}_m=2R_s{i}_{\mathrm{sb}}+R_s{i}_{\mathrm{sc}}\\ d_c{V}_m=2R_s{i}_{\mathrm{sc}}+R_s{i}_{\mathrm{sb}}\end{array}\right.---\left(\text{13}\right)$

$\left\{\begin{array}{c}{d}_a{V}_m=2R_s{i}_{\mathrm{sa}}+R_s{i}_{\mathrm{sc}}\\ d_b=0\\ d_c{V}_m=2R_s{i}_{\mathrm{sc}}+R_s{i}_{\mathrm{sa}}\end{array}\right.---\left(14\right)$

V in the formula _mBe a physical quantity with the actual power direct ratio, through to Active Power Filter-APF dc voltage deviation delta v _dCarry out proportional integral PI and regulate V _m, in adjustment process, need to guarantee dc voltage V _dRemain unchanged, promptly obtain active power required under the present load condition.

Through to Active Power Filter-APF dc voltage deviation delta v _dCarry out proportional integral PI and regulate V _mBe specially: obtain current i by I, II, the Active Power Filter-APF Cycle Control equation in III interval and each interval parameter option table of Active Power Filter-APF of Cycle Control _S1, i _S2

Each interval parameter option table of the Active Power Filter-APF of Cycle Control

Interval	R s.i s1	R s.i s2	S a	S b	S c
						I	R s.i sa	R s.i sb	s 1	s 2	0
II	R s.i sb	R s.i sc	0	s 1	s 2
						III	R s.i sc	R s.i sa	s 2	0	s 1

At first the voltage vector according to three-phase mains voltage area dividing condition judgment table differentiation three-phase alternating current in the three-phase mains voltage area dividing condition judgment table is arranged in interval I, II or III and generates the selection signal; Select corresponding phase current according to selecting signal according to each interval parameter option table of Active Power Filter-APF of Cycle Control; Select each triode corresponding switch drive signal, S in the table according to each interval parameter option table of the Active Power Filter-APF of selecting signal and Cycle Control _aRepresent one in the three-phase to go up the switching signal s of brachium pontis mutually _Ap, because the complementary conducting of its upper and lower bridge arm, then this descends brachium pontis to S mutually _aNegate can obtain down the start pulse signal s of brachium pontis _An, other two phases are similar successively, s ₁, s ₂Be respectively R _s.i _S1, R _s.i _S2Acting in conjunction is held in two rest-set flip-flop S, the start pulse signal of the switching tube of this two trigger Q ends output.

A kind of room for improvement vector Cycle Control device of Active Power Filter-APF; Comprise; Three complete emission set pairs of controlling each pipe in the switching tube should be connected on the collector electrode of each pipe in other three switching tubes; Each switching tube forms a brachium pontis; Aforementioned emitter is the mid point that is connected of brachium pontis with the tie point of collector electrode, and the emitter of other three switching tubes links together and the resistance through two serial connections is connected on the collector electrode that said three switching tubes link together, and the emitter of each switching tube respectively connects the positive pole of a diode; The negative pole of diode is connected to the collector electrode of the coupled switching tube of emitter, is provided with electric capacity between the said emitter that links together, the collector electrode; Be connected to an aforementioned aforementioned connection mid point through an inductance correspondence respectively mutually to the three-phase alternating current of nonlinear load power supply is every; Three-phase alternating current is every to be connected respectively to based on space vector Cycle Control arithmetic unit mutually; Tie point between said two resistance also is connected on the said arithmetic unit; In addition; Comprise that also this arithmetic unit comprises based on space vector Cycle Control arithmetic unit device: vector interval division part is used for according to judging that like the power 1 described three-phase mains voltage area dividing condition judgment table that is used for the voltage vector of differentiating three-phase alternating current is positioned at interval I, II or III; Electric current is selected part; Be used for according to three phase mains phase current, aforementioned differentiation result; Form the output of two-way phase current; The phase current output of every road outputs to the in-phase input end of corresponding amplifier successively through amplifier, adder, phase current output in every road also is connected respectively on the adder of the aforementioned process successively of another road electric current output, and the output of corresponding amplifier is connected to the S end of corresponding rest-set flip-flop; Q ' the end warp of corresponding rest-set flip-flop is connected to resetting integrator with door; Capacitance voltage and reference voltage output to resetting integrator through adder, proportional controller jointly, and resetting integrator outputs to the inverting input of corresponding amplifier, and the clock source is connected to the R end of rest-set flip-flop; Logic selects circuit to export the brachium pontis drive signal according to the differentiation result between the voltage vector location of the output of rest-set flip-flop and cross streams electricity.

The present invention has following technique effect:

Based on room for improvement vector monocyclic control method with respect to traditional space vector monocyclic control method; The space vector zone selects circuit, current selecting circuit and logic to select circuit part all to simplify greatly, thereby overall structure of the present invention obtains simplifying, optimizing.

2. adopt the present invention can make the design of Active Power Filter-APF The whole control system simpler, and obtain the excellent control effect, adopt compensation after-current resultant distortion rate to drop to 5.00%, satisfied the regulation in the national standard quality of power supply utility network harmonic wave.

Description of drawings

Fig. 1 room for improvement vector APF with one-cycle control schematic diagram.

Fig. 2 current transformer space voltage vector subregion.

Fig. 3 is based on room for improvement vector calculus Cycle Control schematic diagram.

A phase source current oscillogram 3 was PTAT current source circuit figure before and after Fig. 4 compensated.Among the figure, a) A phase source current waveform before the compensation, b) compensation back A phase source current waveform.

A phase source current FFT spectrogram before and after Fig. 5 compensates.Among the figure, a) A phase source current FFT frequency spectrum before the compensation, b) compensation back A phase source current FFT frequency spectrum.

Embodiment

(1) Active Power Filter-APF main circuit equation is set up:

Among Fig. 1, establish current transformer output three-phase phase voltage and be respectively v _Ca, v _Cb, v _Cc, for the three-phase symmetrical system, the math equation of describing the current transformer main circuit can be expressed as

$\left[\begin{array}{c}{v}_{\mathrm{ca}}\\ v_{\mathrm{cb}}\\ v_{\mathrm{cc}}\end{array}\right]=L\left[\begin{array}{c}\frac{{\mathrm{di}}_{\mathrm{ca}}}{\mathrm{dt}}\\ \frac{{\mathrm{di}}_{\mathrm{cb}}}{\mathrm{dt}}\\ \frac{{\mathrm{di}}_{\mathrm{cc}}}{\mathrm{dt}}\end{array}\right]+\left[\begin{array}{c}{v}_{\mathrm{sa}}\\ v_{\mathrm{sb}}\\ v_{\mathrm{sc}}\end{array}\right]---\left(1\right)$

Three-phase inverter has 6 power switch pipes among Fig. 1, and wherein the switch on each brachium pontis is operated in complementary state, therefore can define switch function to do

(i＝a，b，c) (2)

Then the voltage of current transformer main circuit output can be expressed as

$\left[\begin{array}{c}{v}_{\mathrm{ca}}\\ v_{\mathrm{cb}}\\ v_{\mathrm{cc}}\end{array}\right]=\frac{1}{3}{V}_d\left[\begin{array}{ccc}2& -1& -1\\ -1& 2& -1\\ -1& -1& 2\end{array}\right]\left[\begin{array}{c}{S}_a\\ S_b\\ S_c\end{array}\right]---\left(3\right)$

Existing hypothesis is at a switch periods T _sIn, the time of brachium pontis conducting is respectively d on the main circuit current transformer abc three-phase _aT _s, d _bT _s, d _cT _s, the prerequisite elder generation in the complementary conducting of each mutually upper and lower brachium pontis switching tube then descends the time of brachium pontis conducting to be respectively (1-d _a) T _s, (1-d _b) T _s(1-d _c) T _s, d wherein _a, d _bAnd d _cIt is respectively the duty ratio of brachium pontis conducting on the abc three-phase.In a switch periods, formula (3) can be write out

$\left[\begin{array}{c}{v}_{\mathrm{ca}}\\ v_{\mathrm{cb}}\\ v_{\mathrm{cc}}\end{array}\right]=\frac{1}{3}{V}_d\left[\begin{array}{ccc}2& -1& -1\\ -1& 2& -1\\ -1& -1& 2\end{array}\right]\left[\begin{array}{c}{d}_a\\ d_b\\ d_c\end{array}\right]---\left(4\right)$

Wushu (4) substitution formula (1) can get

$\frac{1}{3}{V}_d\left[\begin{array}{ccc}2& -1& -1\\ -1& 2& -1\\ -1& -1& 2\end{array}\right]\left[\begin{array}{c}{d}_a\\ d_b\\ d_c\end{array}\right]=L\left[\begin{array}{c}\frac{{\mathrm{di}}_{\mathrm{ca}}}{\mathrm{dt}}\\ \frac{{\mathrm{di}}_{\mathrm{cb}}}{\mathrm{dt}}\\ \frac{{\mathrm{di}}_{\mathrm{cc}}}{\mathrm{dt}}\end{array}\right]+\left[\begin{array}{c}{v}_{\mathrm{sa}}\\ v_{\mathrm{sb}}\\ v_{\mathrm{sc}}\end{array}\right]---\left(5\right)$

(2) based on Cycle Control thought Active Power Filter-APF main circuit equation simplification:

For the voltage Ldi/dt at Active Power Filter-APF outlet inductance two ends, suppose at a switch periods T _sThe stage of opening electric current increase, then reduce at the off-phases electric current because switching frequency is enough big, can think that the voltage Ldi/dt at switch periods internal inductance two ends is 0, then can get by formula (5)

$\left[\begin{array}{c}{v}_{\mathrm{sa}}\\ v_{\mathrm{sb}}\\ v_{\mathrm{sc}}\end{array}\right]=\frac{1}{3}{V}_d\left[\begin{array}{ccc}2& -1& -1\\ -1& 2& -1\\ -1& -1& 2\end{array}\right]\left[\begin{array}{c}{d}_a\\ d_b\\ d_c\end{array}\right]---\left(6\right)$

(3) the room for improvement vector is divided and judgment basis:

Be illustrated in figure 2 as Active Power Filter-APF current transformer space voltage vector distribution map, according to six fundamental space voltage vector V in the different on off state composition diagram of converter switches pipe ₁～V ₆, V for example ₁(100) on behalf of a, " 100 " go up brachium pontis conducting, b mutually respectively and is gone up mutually that brachium pontis turn-offs and c goes up the brachium pontis shutoff mutually in.

If the power supply phase voltage is v _Sa, v _Sb, v _Sc, with three-phase voltage from the abc coordinate system transformation to be mutually 60 the degree xy transformation of coordinates formula suc as formula shown in (7)

$\left[\begin{array}{c}{v}_{\mathrm{sx}}\\ v_{\mathrm{sy}}\end{array}\right]=C\left[\begin{array}{c}{v}_{\mathrm{sa}}\\ v_{\mathrm{sb}}\\ v_{\mathrm{sc}}\end{array}\right]=\left[\begin{array}{ccc}1& -1& 0\\ 0& 1& -1\end{array}\right]\left[\begin{array}{c}{v}_{\mathrm{sa}}\\ v_{\mathrm{sb}}\\ v_{\mathrm{sc}}\end{array}\right]---\left(7\right)$

Make the supply voltage vector V _s=v _SxX+v _SxY is then seen shown in the table 1 by the decision condition that Fig. 4 can draw supply voltage vector region.

Rule of judgment when table 1 three-phase mains voltage is divided six sectors

The sector

1

2

3

4

5

6

Condition 1

v sx＞0

v sx＜0

v sx＜0

v sx＜0

v sx＞0

v sx＞0

Condition 2

v sy＞0

v sy＞0

v sy＞0

v sy＜0

v sy＜0

v sy＜0

Condition 3

--

|v sx|＜|v sy|

|v sx|＞|v sy|

--

|v sx|＜|v xy|

|v sx|＞|v sy|

Among Fig. 2, because fundamental space vector V in the zone 1,2 ₁～V ₃C be 0 mutually, therefore can area I be merged in zone 1,2, in like manner zone 3,4 and zone 5,6 are merged into area I I, III respectively.By decision condition in the table 1 and each variable is carried out contravariant change to the abc coordinate system and can draw the decision condition under new zoning, as shown in table 2.

Table 2 three-phase mains voltage area dividing condition judgment

The zone	I	II	III
				Condition 1	v sb-v sc＞0	v sc-v sa＞0	v sa-v sb＞0
Condition 2	v sc-v sa≤0	v sa-v sb≤0	v sb-v sc≤0

(4) Active Power Filter-APF room for improvement vector monocyclic control method is realized:

Suppose that the supply voltage vector is positioned at I shown in Figure 2 district, can find out that then c goes up brachium pontis mutually and turn-offs all the time, i.e. d _c=0.With d _cCan obtain in=0 substitution formula (6)

$\left\{\begin{array}{c}{V}_d{d}_a=2v_{\mathrm{sa}}+v_{\mathrm{sb}}\\ V_d{d}_b=2v_{\mathrm{sb}}+v_{\mathrm{sa}}\\ d_c=0\end{array}\right.---\left(8\right)$

The controlled target of the three phase active electric power filter of Cycle Control is to realize the control of entire circuit unity power factor, promptly makes the total load of power supply be resistive after the compensation, and establishing all-in resistance is R _e, then have

$\left\{\begin{array}{c}{v}_{\mathrm{sa}}=R_e{i}_{\mathrm{sa}}\\ v_{\mathrm{sb}}=R_e{i}_{\mathrm{sb}}\\ v_{\mathrm{sc}}=R_e{i}_{\mathrm{sc}}\end{array}\right.---\left(9\right)$

Formula (9) substitution formula (8) can be got

$\left\{\begin{array}{c}{d}_a{V}_d/R_e=2i_{\mathrm{sa}}+i_{\mathrm{sb}}\\ d_b{V}_d/R_e=2i_{\mathrm{sb}}+i_{\mathrm{sa}}\\ d_c=0\end{array}\right.---\left(10\right)$

If sampling resistor is R _s, and order

$V_m=\frac{R_s}{R_e}{V}_d---\left(11\right)$

Formula (11) substitution formula (10) is got

$\left\{\begin{array}{c}{d}_a{V}_m=2R_s{i}_{\mathrm{sa}}+R_s{i}_{\mathrm{sb}}\\ d_b{V}_m=2R_s{i}_{\mathrm{sb}}+R_s{i}_{\mathrm{sa}}\\ d_c=0\end{array}\right.---\left(12\right)$

V in the formula (12) _mShould be a physical quantity with the actual power direct ratio, so V _mCan pass through Active Power Filter-APF dc voltage deviation delta v _dCarry out PI and regulate, in adjustment process, both guaranteed dc voltage V _dBe stabilized in reference voltage V _DrefNear remain unchanged, also obtained the required active power of whole system under the present load condition.Formula (12) is the governing equation of Active Power Filter-APF Cycle Control in the I zone, in like manner uses similarity method can obtain seeing respectively shown in formula (13), the formula (14) at II, the interval Active Power Filter-APF Cycle Control equation of III.

$\left\{\begin{array}{c}{d}_a=0\\ d_b{V}_m=2R_s{i}_{\mathrm{sb}}+R_s{i}_{\mathrm{sc}}\\ d_c{V}_m=2R_s{i}_{\mathrm{sc}}+R_s{i}_{\mathrm{sb}}\end{array}\right.---\left(\text{13}\right)$

$\left\{\begin{array}{c}{d}_a{V}_m=2R_s{i}_{\mathrm{sa}}+R_s{i}_{\mathrm{sc}}\\ d_b=0\\ d_c{V}_m=2R_s{i}_{\mathrm{sc}}+R_s{i}_{\mathrm{sa}}\end{array}\right.---\left(14\right)$

At I, II, III zone source current i _S1, i _S2Select, reach abc threephase switch pipe switching logic and select to see shown in the table 3, wherein i _Sa, i _Sb, i _ScBe the three phase mains electric current of seeing from mains side, S _aRepresent a to go up the switching signal s of brachium pontis mutually _Ap, because the complementary conducting of its upper and lower bridge arm, then a descends brachium pontis to S mutually _aNegate can obtain down the start pulse signal s of brachium pontis _An, other bc are similar successively mutually, s ₁, s ₂Be respectively the start pulse signal of the switching tube of rest-set flip-flop Q end output among Fig. 3.

When the supply voltage vector was positioned at interval I, the interval selection signal was made as 1, and other are analogized, and was mainly used in to judge i among Fig. 3 _S1, i _S2Selection, i.e. i _S1Be to select A phase current or B phase or C phase, and judge that the triggering signal of six switching tubes among Fig. 1 is to select the Q end s of trigger 1 ₁Still the Q of trigger 2 holds s ₂, table 3 is seen in its system of selection.

Each interval parameter of the Active Power Filter-APF of table 3 Cycle Control is selected

Interval	R s.i s1	R s.i s2	S a	S b	S c
						I	R s.i sa	R s.i sb	s 1	s 2	0
II	R s.i sb	R s.i sc	0	s 1	s 2
						III	R s.i sc	R s.i sa	s 2	0	s 1

Three-phase APF system, control circuit principle is as shown in Figure 3, at first according to the residing interval of space vector of voltage decision condition interval selection voltage vector in the table 2 and generate the interval selection signal, as the selection signal of current selecting circuit and logical circuit; Select circuit to select corresponding phase current according to the interval selection signal code according to table 3; The start pulse signal logic of switching tube is selected circuit to press according to the interval selection signal and is selected the corresponding drive signal of each switching tube in the table 3.For example, when the supply voltage vector was positioned at interval I, the interval selection signal was made as 1, then pressed i shown in the table 3 _S1Select i _Sa, i _S2Select i _Sb, logic selects circuit to press at this moment that A goes up brachium pontis switching tube triggering signal S mutually in the table 3 _aSelect s ₁, A goes up brachium pontis S mutually _bSelect s ₂, C goes up brachium pontis S mutually _cSelect 0, and each phase upper and lower bridge arm is complementary, analogy when other are interval.i _Sa, i _Sb, i _ScBe respectively the ABC three-phase current.V _DrefBe the stable reference value of control dc voltage, promptly regulate making actual dc voltage be stabilized in V through PI _Dref

By checking the correctness and the feasibility of proposition control method, set up simulation model at MATLAB/SIMULINK, it is carried out simulation analysis.Simulation system parameters is: power line voltage 380V; Frequency 50Hz; Load is the load of resistance sense property; Dc capacitor voltage 600V; AC side inlet wire inductance 0.5mH, resistance is ignored; Dc bus capacitor is 1500 μ F.

Analogue system is the three-phase symmetrical system, and Fig. 4 (a) compensates preceding load current waveform mutually for A, and current waveform is carried out the FFT spectrum analysis, and shown in Fig. 5 (a), electric current resultant distortion rate THD is 25.00%, well beyond national standard.Fig. 4 (b) carries out the FFT spectrum analysis to current waveform, shown in Fig. 5 (b) equally for A compensates back source current waveform mutually.The result can find out by the FFT spectrum analysis, and compensation after-current resultant distortion rate drops to 5.00%, has satisfied the regulation in the national standard quality of power supply utility network harmonic wave.

In recent years, along with the particularly power electronic equipment extensive use in electric power system of various nonlinear loads, the Harmonious Waves in Power Systems pollution problem increases the weight of day by day.Active Power Filter-APF is the effective means that harmonic wave suppresses, and will be applied in the Active Power Filter-APF control strategy based on room for improvement vector monocyclic control method, makes the design of Active Power Filter-APF The whole control system simpler.

Shown in Figure 3 based on room for improvement vector monocyclic control method with respect to traditional space vector monocyclic control method, the space vector zone selects circuit, current selecting circuit and logic to select circuit part all to simplify greatly.Can find out by A phase power source current spectrum figure before and after the compensation as shown in Figure 5; After Active Power Filter-APF compensation under this control mode; The harmonic current aberration rate reduces greatly, and the source current after the compensation has met the regulation in the national quality of power supply utility network harmonic standard basically.

Claims (3)

1. the room for improvement vector monocyclic control method of an Active Power Filter-APF; It is characterized in that; Realize by means of following array apparatus: three complete emission set pairs of controlling each pipe in the switching tube should be connected on the collector electrode of each pipe in other three switching tubes; Each switching tube forms a brachium pontis; Aforementioned emitter is the mid point that is connected of brachium pontis with the tie point of collector electrode, and the emitter of other three switching tubes links together and the resistance through two serial connections is connected on the collector electrode that said three switching tubes link together, and the emitter of each switching tube respectively connects the positive pole of a diode; The negative pole of diode is connected to the collector electrode of the coupled switching tube of emitter, is provided with electric capacity between the said emitter that links together, the collector electrode; Be connected to an aforementioned aforementioned connection mid point through an inductance correspondence respectively mutually to the three-phase alternating current of nonlinear load power supply is every; Three-phase alternating current is every to be connected respectively to based on space vector Cycle Control arithmetic unit mutually, and the tie point between said two resistance also is connected on the said arithmetic unit;

To be based on Cycle Control thought Active Power Filter-APF main circuit equation simplification:

$\left[\begin{array}{c}{v}_{\mathrm{sa}}\\ v_{\mathrm{sb}}\\ v_{\mathrm{sc}}\end{array}\right]=\frac{1}{3}{V}_d\left[\begin{array}{ccc}2& -1& -1\\ -1& 2& -1\\ -1& -1& 2\end{array}\right]\left[\begin{array}{c}{d}_a\\ d_b\\ d_c\end{array}\right]---\left(6\right)$

V in the following formula _Sa, v _Sb, v _ScBe three-phase alternating voltage, d _a, d _bAnd d _cCorrespond to the duty ratio of a brachium pontis above the connection mid point respectively, Vd is the electric capacity voltage;

Three-phase mains voltage area dividing condition judgment table

The zone I II III Condition 1 v _sb-v _sc＞0 v _sc-v _sa＞0 v _sa-v _sb＞0 Condition 2 v _sc-v _sa≤0 v _sa-v _sb≤0 v _sb-v _sc≤0

On off state according to triode is different is formed six fundamental space voltage vector V ₁-V ₆, angle is 60 degree between each space voltage vector, establishes three bit digital and representes the brachium pontis on off operating mode, representes conducting during for " 1 ", is that " 0 " expression turn-offs, first to the 3rd represent three-phase alternating current successively first to the 3rd, and six fundamental space voltage vector V then ₁-V ₆Arrange counterclockwise successively, the brachium pontis on off operating mode that each space voltage vector is corresponding is followed successively by (100), (110), (010), (011), (001), (101), V ₁Counterclockwise to V ₃The zone is interval I, V ₃Counterclockwise to V ₅The zone is interval II, V ₅Counterclockwise to V ₁The zone is interval III, and the voltage vector of being differentiated three-phase alternating current by three-phase mains voltage area dividing condition judgment table is arranged in interval I, II or III, obtains the corresponding brachium pontis on off state d that goes up mutually by differentiating the result _a, d _bOr d _c, and substitution formula (6), obtain at the Active Power Filter-APF Cycle Control equation in I, II, III interval following successively:

$\left\{\begin{array}{c}{d}_a{V}_m=2R_s{i}_{\mathrm{sa}}+R_s{i}_{\mathrm{sb}}\\ d_b{V}_m=2R_s{i}_{\mathrm{sb}}+R_s{i}_{\mathrm{sa}}\\ d_c=0\end{array}\right.---\left(12\right)$

$\left\{\begin{array}{c}{d}_a=0\\ d_b{V}_m=2R_s{i}_{\mathrm{sb}}+R_s{i}_{\mathrm{sc}}\\ d_c{V}_m=2R_s{i}_{\mathrm{sc}}+R_s{i}_{\mathrm{sb}}\end{array}\right.---\left(\text{13}\right)$

$\left\{\begin{array}{c}{d}_a{V}_m=2R_s{i}_{\mathrm{sa}}+R_s{i}_{\mathrm{sc}}\\ d_b=0\\ d_c{V}_m=2R_s{i}_{\mathrm{sc}}+R_s{i}_{\mathrm{sa}}\end{array}\right.---\left(14\right)$

V in the formula _mBe a physical quantity with the actual power direct ratio, through to Active Power Filter-APF dc voltage deviation delta v _dCarry out proportional integral PI and regulate V _m, in adjustment process, need to guarantee dc voltage V _dRemain unchanged, promptly obtain active power required under the present load condition.

2. method according to claim 1 is characterized in that, through to Active Power Filter-APF dc voltage deviation delta v _dCarry out proportional integral PI and regulate V _mBe specially: obtain current i by I, II, the Active Power Filter-APF Cycle Control equation in III interval and each interval parameter option table of Active Power Filter-APF of Cycle Control _S1, i _S2:

Each interval parameter option table of the Active Power Filter-APF of Cycle Control

Interval R _s.i _s1 R _s.i _s2 S _a S _b S _c I R _s.i _sa R _s.i _sb s ₁ s ₂ 0 II R _s.i _sb R _s.i _sc 0 s ₁ s ₂ III R _s.i _sc R _s.i _sa s ₂ 0 s ₁

At first the voltage vector according to three-phase mains voltage area dividing condition judgment table differentiation three-phase alternating current in the three-phase mains voltage area dividing condition judgment table is arranged in interval I, II or III and generates the selection signal; Select corresponding phase current according to selecting signal according to each interval parameter option table of Active Power Filter-APF of Cycle Control; Select each triode corresponding switch drive signal, S in the table according to each interval parameter option table of the Active Power Filter-APF of selecting signal and Cycle Control _aRepresent one in the three-phase to go up the switching signal s of brachium pontis mutually _Ap, because the complementary conducting of its upper and lower bridge arm, then this descends brachium pontis to S mutually _aNegate can obtain down the start pulse signal s of brachium pontis _An, other two phases are similar successively, s ₁, s ₂Be respectively R _sI _S1, R _sI _S2Acting in conjunction is held in two rest-set flip-flop S, the start pulse signal of the switching tube of this two trigger Q ends output.

3. the room for improvement vector Cycle Control device of an Active Power Filter-APF; It is characterized in that; Comprise; Three complete emission set pairs of controlling each pipe in the switching tube should be connected on the collector electrode of each pipe in other three switching tubes, and each switching tube forms a brachium pontis, and aforementioned emitter is the mid point that is connected of brachium pontis with the tie point of collector electrode; The emitter of other three switching tubes links together and the resistance through two serial connections is connected on the collector electrode that said three switching tubes link together; The emitter of each switching tube respectively connects the positive pole of a diode, and the negative pole of diode is connected to the collector electrode of the coupled switching tube of emitter, is provided with electric capacity between the said emitter that links together, the collector electrode; Be connected to an aforementioned aforementioned connection mid point through an inductance correspondence respectively mutually to the three-phase alternating current of nonlinear load power supply is every; Three-phase alternating current is every to be connected respectively to based on space vector Cycle Control arithmetic unit mutually; Tie point between said two resistance also is connected on the said arithmetic unit; In addition; Comprise that also this arithmetic unit comprises based on space vector Cycle Control arithmetic unit: vector interval division part is used for according to judging that like the power 1 described three-phase mains voltage area dividing condition judgment table that is used for the voltage vector of differentiating three-phase alternating current is positioned at interval I, II or III; Electric current is selected part; Be used for according to three phase mains phase current, aforementioned differentiation result; Form the output of two-way phase current; The phase current output of every road outputs to the in-phase input end of corresponding amplifier successively through amplifier, adder, phase current output in every road also is connected respectively on the adder of the aforementioned process successively of another road electric current output, and the output of corresponding amplifier is connected to the S end of corresponding rest-set flip-flop; Q ' the end warp of corresponding rest-set flip-flop is connected to resetting integrator with door; Capacitance voltage and reference voltage output to resetting integrator through adder, proportional controller jointly, and resetting integrator outputs to the inverting input of corresponding amplifier, and the clock source is connected to the R end of rest-set flip-flop; Logic selects circuit to export the brachium pontis drive signal according to the differentiation result between the voltage vector location of the output of rest-set flip-flop and cross streams electricity.

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