Improved virtual synchronous control for grid-connected VSCs under grid voltage unbalanced conditions
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摘要
This paper presents an improved virtual synchronous control(VSynC) for the grid-connected voltage source converter(VSC) so as to continuously operate under the grid voltage with steady unbalance.The improved VSynC introduces the negative sequence power controls on basis of conventional VSynC.The improved VSynC is capable of regulating the negative sequence internal voltage to reduce the negative-sequence injected currents and oscillated powers of the VSC aroused by the negative-sequence grid voltage.Three alternative local control objectives for the VSC itself under steady state unbalanced grid conditions and their corresponding power references are deduced and computed.Simulated and experimental results are presented to validate the correctness and effectiveness of the proposed improved VSynC to enhance the continuous operation performance of VSynC-based VSCs during grid voltage steady-state unbalance.
This paper presents an improved virtual synchronous control(VSynC) for the grid-connected voltage source converter(VSC) so as to continuously operate under the grid voltage with steady unbalance.The improved VSynC introduces the negative sequence power controls on basis of conventional VSynC.The improved VSynC is capable of regulating the negative sequence internal voltage to reduce the negative-sequence injected currents and oscillated powers of the VSC aroused by the negative-sequence grid voltage.Three alternative local control objectives for the VSC itself under steady state unbalanced grid conditions and their corresponding power references are deduced and computed.Simulated and experimental results are presented to validate the correctness and effectiveness of the proposed improved VSynC to enhance the continuous operation performance of VSynC-based VSCs during grid voltage steady-state unbalance.
This paper presents an improved virtual synchronous control(VSynC) for the grid-connected voltage source converter(VSC) so as to continuously operate under the grid voltage with steady unbalance.The improved VSynC introduces the negative sequence power controls on basis of conventional VSynC.The improved VSynC is capable of regulating the negative sequence internal voltage to reduce the negative-sequence injected currents and oscillated powers of the VSC aroused by the negative-sequence grid voltage.Three alternative local control objectives for the VSC itself under steady state unbalanced grid conditions and their corresponding power references are deduced and computed.Simulated and experimental results are presented to validate the correctness and effectiveness of the proposed improved VSynC to enhance the continuous operation performance of VSynC-based VSCs during grid voltage steady-state unbalance.
引文
[1]Carrasco JM, Franquelo L, Bialasiewicz J et al(2006)Powerelectronic systems for the grid integration of renewable energy sources:a survey. IEEE Trans Ind Electron 53(4):1002–1016
[2]Blaabjerg F, Chen Z, Kjaer SB(2004)Power electronics as efficient interface in dispersed power generation systems. IEEE Trans Power Electron 19(5):1184–1194
[3]Larsen EV, Delmerico RW(1998)Battery energy storage power conditioning system. US Patent 5,798,633, 25 August 1998
[4]Zhong QC, Weiss G(2011)Synchronverters:inverters that mimic synchronous generators. IEEE Trans Ind Electron58(4):1259–1267
[5]D’arco S, Suul JA(2013)Virtual synchronous machines-classification of implementations and analysis of equivalence to droop controllers for microgrids.In:Processding of IEEE Gre-noble PowerTech, Grenoble, France, 16–20 June 2013, 7 pp
[6]Zhong QC, Nguyen PL, Ma Z et al(2013)Self-synchronized synchronverters:inverters without a dedicated synchronization unit. IEEE Trans Power Electron 29(2):617–630
[7]Alipoor J, Miura Y, Ise T(2015)Power system stabilization using virtual synchronous generator with alternating moment of inertia. IEEE J Emerg Sel Top Power Electron 3(2):451–458
[8]Zhang LD, Harnefors L, Nee HP(2010)Power-synchronization control of grid-connected voltage-source converters. IEEE Trans Power Syst 25(2):809–820
[9]Guan M, Pan W, Zhang J et al(2015)Synchronous generator emulation control strategy for voltage source converter(VSC)stations. IEEE Trans Power Syst 30(6):3093–3101
[10]Wang S, Hu JB, Yuan XM(2015)Virtual synchronous control for grid-connected DFIG-based wind turbines. IEEE J Emerg Sel Top Power Electron 3(4):932–944
[11]Pena R, Cardenas R, Clare J et al(2002)Control strategy of doubly fed induction generators for a wind diesel energy system.In:Proceedings of IEEE 2002 28th annual conference of the industrial electronics society, Sevilla, Spain, 5–8 November2002, pp 3297–3302
[12]Teodorescu R, Liserre M, Rodriguez P(2011)Grid Ccoonnvveerrtteerrs sfor photovoltaic and wind power systems. Wiley, New York
[13]Zhi D, Xu L, Williams BW(2009)Improved direct power control of grid-connected DC/AC converters. IEEE Trans Power Electron 24(5):1280–1292
[14]Hu JB, Shang L, He YK et al(2011)Direct active and reactive power regulation of grid connected voltage source converters using sliding mode control approach. IEEE Trans Power Electron 26(1):210–222
[15]Kundur P(1994)Power system stability and control.McGrawHill, New York
[16]Song HS, Nam K(1999)Dual current control scheme for PWM converter under unbalanced input voltage conditions. IEEE Trans Ind Electron 46(5):953–959
[17]Xu L, Andersen BR, Cartwright P(2005)VSC transmission operating under unbalanced AC conditions-analysis and control design. IEEE Trans Power Deliv 20(1):427–434
[18]Hu JB, He YK, Xu L et al(2009)Improved control of DFIG systems during network unbalance using PI–R current regulators. IEEE Trans Ind Electron 56(2):439–451
[19]Hu JB, Xu HL, He YK(2013)Coordinated control of DFIG’s RSC and GSC under generalized unbalanced and distorted grid voltage conditions. IEEE Trans Ind Electron 60(7):2808–2819
[20]Nian H, Zeng R(2011)Improved control strategy for standalone distributed generation system under unbalanced and nonlinear loads. IET Renew Power Gener 5(5):323–331
[21]Savaghebi M, Jalilian A, Vasquez JC(2012)A secondary control level to focus the grid voltage and does not concern the local control objectives of the VSC. IEEE Trans Smart Grid3(2):797–807
[22]Guerrero JM, Loh PC, Lee TL et al(2012)Advanced control architectures for intelligent microgrids—part II:power quality,energy storage, and AC/DC microgrids. IEEE Trans Ind Electron 60(4):1263–1270
[23]Shang L, Sun D, Hu JB(2011)Sliding-mode-based direct power control of grid-connected voltage-sourced inverters under unbalanced network conditions. IET Power Electronics4(5):570–579
[24]Hu JB, Zhu ZQ(2013)Improved voltage-vector sequences on dead-beat predictive direct power control of reversible threephase grid-connected voltage-sourced converters. IEEE Trans Power Electron 28(1):254–267
[25]Zhang Y, Qu C(2015)Model predictive direct power control of PWM rectifiers under unbalanced network conditions. IEEE Trans Ind Electron 62(7):4011–4022
[26]Nian H, Cheng P, Zhu ZQ(2015)Coordinated direct power control of DFIG system without phase-locked loop under unbalanced grid voltage conditions. IEEE Trans Power Electron31(4):2905–2918
[27]Shang L, Hu JB, Yuan XM et al(2015)Amplitude-phase-locked loop:estimator of three-phase grid voltage vector. In:Proceedings of 2015 IEEE power&energy society general meeting, Denver, USA, 26–30 July 2015, 5 pp
[28]Song HS, Joo IW, Nam K(2004)Source voltage sensorless estimation scheme for pwm rectifiers under unbalanced conditions. IEEE Trans Ind Electron 50(6):1238–1245
[2]Blaabjerg F, Chen Z, Kjaer SB(2004)Power electronics as efficient interface in dispersed power generation systems. IEEE Trans Power Electron 19(5):1184–1194
[3]Larsen EV, Delmerico RW(1998)Battery energy storage power conditioning system. US Patent 5,798,633, 25 August 1998
[4]Zhong QC, Weiss G(2011)Synchronverters:inverters that mimic synchronous generators. IEEE Trans Ind Electron58(4):1259–1267
[5]D’arco S, Suul JA(2013)Virtual synchronous machines-classification of implementations and analysis of equivalence to droop controllers for microgrids.In:Processding of IEEE Gre-noble PowerTech, Grenoble, France, 16–20 June 2013, 7 pp
[6]Zhong QC, Nguyen PL, Ma Z et al(2013)Self-synchronized synchronverters:inverters without a dedicated synchronization unit. IEEE Trans Power Electron 29(2):617–630
[7]Alipoor J, Miura Y, Ise T(2015)Power system stabilization using virtual synchronous generator with alternating moment of inertia. IEEE J Emerg Sel Top Power Electron 3(2):451–458
[8]Zhang LD, Harnefors L, Nee HP(2010)Power-synchronization control of grid-connected voltage-source converters. IEEE Trans Power Syst 25(2):809–820
[9]Guan M, Pan W, Zhang J et al(2015)Synchronous generator emulation control strategy for voltage source converter(VSC)stations. IEEE Trans Power Syst 30(6):3093–3101
[10]Wang S, Hu JB, Yuan XM(2015)Virtual synchronous control for grid-connected DFIG-based wind turbines. IEEE J Emerg Sel Top Power Electron 3(4):932–944
[11]Pena R, Cardenas R, Clare J et al(2002)Control strategy of doubly fed induction generators for a wind diesel energy system.In:Proceedings of IEEE 2002 28th annual conference of the industrial electronics society, Sevilla, Spain, 5–8 November2002, pp 3297–3302
[12]Teodorescu R, Liserre M, Rodriguez P(2011)Grid Ccoonnvveerrtteerrs sfor photovoltaic and wind power systems. Wiley, New York
[13]Zhi D, Xu L, Williams BW(2009)Improved direct power control of grid-connected DC/AC converters. IEEE Trans Power Electron 24(5):1280–1292
[14]Hu JB, Shang L, He YK et al(2011)Direct active and reactive power regulation of grid connected voltage source converters using sliding mode control approach. IEEE Trans Power Electron 26(1):210–222
[15]Kundur P(1994)Power system stability and control.McGrawHill, New York
[16]Song HS, Nam K(1999)Dual current control scheme for PWM converter under unbalanced input voltage conditions. IEEE Trans Ind Electron 46(5):953–959
[17]Xu L, Andersen BR, Cartwright P(2005)VSC transmission operating under unbalanced AC conditions-analysis and control design. IEEE Trans Power Deliv 20(1):427–434
[18]Hu JB, He YK, Xu L et al(2009)Improved control of DFIG systems during network unbalance using PI–R current regulators. IEEE Trans Ind Electron 56(2):439–451
[19]Hu JB, Xu HL, He YK(2013)Coordinated control of DFIG’s RSC and GSC under generalized unbalanced and distorted grid voltage conditions. IEEE Trans Ind Electron 60(7):2808–2819
[20]Nian H, Zeng R(2011)Improved control strategy for standalone distributed generation system under unbalanced and nonlinear loads. IET Renew Power Gener 5(5):323–331
[21]Savaghebi M, Jalilian A, Vasquez JC(2012)A secondary control level to focus the grid voltage and does not concern the local control objectives of the VSC. IEEE Trans Smart Grid3(2):797–807
[22]Guerrero JM, Loh PC, Lee TL et al(2012)Advanced control architectures for intelligent microgrids—part II:power quality,energy storage, and AC/DC microgrids. IEEE Trans Ind Electron 60(4):1263–1270
[23]Shang L, Sun D, Hu JB(2011)Sliding-mode-based direct power control of grid-connected voltage-sourced inverters under unbalanced network conditions. IET Power Electronics4(5):570–579
[24]Hu JB, Zhu ZQ(2013)Improved voltage-vector sequences on dead-beat predictive direct power control of reversible threephase grid-connected voltage-sourced converters. IEEE Trans Power Electron 28(1):254–267
[25]Zhang Y, Qu C(2015)Model predictive direct power control of PWM rectifiers under unbalanced network conditions. IEEE Trans Ind Electron 62(7):4011–4022
[26]Nian H, Cheng P, Zhu ZQ(2015)Coordinated direct power control of DFIG system without phase-locked loop under unbalanced grid voltage conditions. IEEE Trans Power Electron31(4):2905–2918
[27]Shang L, Hu JB, Yuan XM et al(2015)Amplitude-phase-locked loop:estimator of three-phase grid voltage vector. In:Proceedings of 2015 IEEE power&energy society general meeting, Denver, USA, 26–30 July 2015, 5 pp
[28]Song HS, Joo IW, Nam K(2004)Source voltage sensorless estimation scheme for pwm rectifiers under unbalanced conditions. IEEE Trans Ind Electron 50(6):1238–1245
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