《電力電子電機(jī)控制系統(tǒng)仿真技術(shù)》洪乃剛第6章

1、udcucaubcuabtspeedContinuouspowerguiphisqphisdphirqphirdiscisbisaircirbiragABC+-Universal BridgeUab1UabTeTLsignalrmsRMSSignal(s)PulsesPWM Generator4MultimeterInMeanMean Valuemir_abcphir_qdis_abcphis_qdwmTeMachinesMeasurementDemux19.55GainDemuxDemuxDemuxDemuxDemuxDC ClockTmmABCAsynchronous MachineSI

2、Units模型算法：ode23t 0.20.2050.210.2150.220.2250.23-600-400-2000200400600time ( s )uab ( A )00.20.40.60.81050010001500t / sn / rpm00.20.40.60.81-100-50050100t / sisa / A00.20.40.60.81-100-50050100t / sira / A-1-0.500.51-1-0.500.51phisdphisq-1-0.500.51-1-0.500.51phirdphirqmmNssgCfkNfE1144. 41fmgEgE1/ fEg

3、mC改變頻率就需要同時(shí)改變使為固定的常數(shù) 在變頻調(diào)速時(shí)要保持氣隙磁通不變，常采用常數(shù)1/ fUS的控制，稱為VVVF控制 升降速時(shí)間設(shè)定用來限制電機(jī)的升頻速度，避免轉(zhuǎn)速上升過快而造成電流和轉(zhuǎn)矩的沖擊， U/F曲線根據(jù)頻率確定相應(yīng)的電壓以保持壓頻比不變 SPWM和驅(qū)動(dòng)環(huán)節(jié)產(chǎn)生按正弦脈寬調(diào)制的驅(qū)動(dòng)信號(hào)控制逆變器和電機(jī)。 fuucaf(u)ucubcf(u)ubuabf(u)uanicibia50f* HzclockIn1Out1V-FUdUabTeTLgABC+-SPWM BridgesignalrmsRMSSignal(s)PulsesPWM GeneratorMux1Mux3Multimete

4、rmis_abcwmTeMachinesDemux9.55GainIn1Out1GIDemuxDemux1DemuxDemuxTmmABCAC motor1Out1Saturation1G(VF)Gain1u(f)Fcn11In100)(VffVVfuNNNV0VNf電機(jī)額定電壓，起動(dòng)時(shí)補(bǔ)償定子電阻壓降的電壓，電機(jī)額定頻率。 V-F模塊結(jié)構(gòu) 3*4)3(*)2(*2sin*) 1 (3*2)3(*)2(*2sin*) 1 ()3(*)2(*2sin*) 1 (piuupiuupiuupiuuuupiuucba轉(zhuǎn)速開環(huán)VVVF系統(tǒng)模型參數(shù)表6.3012345601020304050t / sf

5、/ Hz0123450500100015002000t / sn / rpm01234560100200300400500t / sUab / V012345-1000100200t / sTe / N.mucubuab1uauABtenc12k4c12k3c12k2c12k1iabciABCv+-v+-v+-Uab40TLStep1StepR1bmir_abcis_abcwmTeMachinesDemux9.55GainTmmABCabcAsynchronous MachineSI Units R2c R2b R2a R1c R1a調(diào)速電阻設(shè)R1=R2=5, 在起動(dòng)1.5秒時(shí)接通開關(guān)K3和

6、K4，切除三相電阻R2；3秒時(shí)接通開關(guān)K1和K2，切除全部轉(zhuǎn)子電阻。 00.511.522.533.544.55050010001500time (s)n (r/m)00.511.522.533.544.55050100150200time (s)Te (N.m)00.511.522.533.544.55-40-20020406080time (s)ir (A)00.511.522.533.544.55-100-50050100time (s)is (A) 不控整流器將轉(zhuǎn)子的三相交流轉(zhuǎn)變?yōu)橹绷?，?jīng)三相晶閘管整流器將直流變換為50Hz的交流電經(jīng)變壓器與電網(wǎng)連接。串調(diào)系統(tǒng)中晶閘管整流器工作于有源逆

7、變狀態(tài)，改變逆變角，可以實(shí)現(xiàn)電動(dòng)機(jī)的平滑調(diào)速。晶閘管整流器采用了轉(zhuǎn)速、電流的閉環(huán)控制，改變轉(zhuǎn)速的設(shè)定值即可調(diào)節(jié)電動(dòng)機(jī)速度。 ud1ud2iduscusbusausud2ud1uctuaqs1qsqrps1psprContinuouspowerguiis1isgABC+-inverteridiabata0.002s+1i-feed10.002s+1i-Filtv+-ca0blockv+-bcalphav+-abv+-v+-Un*ABCabcThree-PhaseTransformer(Two Windings)TLScope410.01s+1N-Filtalpha0.01s+1N-Feed5Mu

8、ltimetermir_abcis_abcwmTeMachinesMeasurementDemuxL30/piFcnFcnABC+-Diodei+-i+-TmmABCabcAsynchronous MachineSI UnitsVIPQActive & ReactivePower2VIPQActive & ReactivePower1VIPQActive & ReactivePowerPI controllerASRPI controllerACRalpha_degABBCCABlockpulses6-Pulse 00.511.522.5050010001500t /

9、sn / rpm00.511.522.50200400600800t / sid / A22.0052.012.0152.022.0252.032.0352.04-400-2000200400t / sus / V, is / Ausis22.0052.012.0152.022.0252.032.0352.04-400-2000200400t / sus / V, is1 / Ausis122.0052.012.0152.022.0252.032.0352.04-400-2000200400t / sua / V, ia / Auaia00.511.522.5-20246810 x 104t

10、/ sPs / W, Qs / VarQsPs00.511.522.502468x 104t / sPs / W, Qs / VarPs1Qs100.511.522.5-10123x 104t / sPr / W, Qr / VarPrQruabthetapulse2npn*nicibiaecebeathetampulsegatecontrollerv+-gABC+-Universal BridgeTeTLTLTmmABCPermanent MagnetSynchronous MachineSignal(s)PulsesPWM GeneratorG1Gain130/piGainDCBusSelectorIn1uc*ASR1gaten1Scope4Scope3Scope2Scope1floorRoundingFunction=RelationalOperator5=ANDANDANDANDANDAND1/(2*pi)Gain2u(2)-u(1)*2*pi12*piConstant55*pi/3Constant44*pi/3Constant3piConstant22*pi/3Constant1pi/3Constant2pulse1thetam梯形波永磁同步電動(dòng)機(jī)調(diào)速系統(tǒng)模型參數(shù)表6.4