Inverter DC-link stabilizing control with improved voltage sag ride-through capability

Harnefors, Lennart; Pietiläinen, Kai

doi:10.1109/epe.2005.219553

Cited by 22 publications

(9 citation statements)

References 10 publications

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“…Here, we focus on stability of the system especially when the cutoff frequency of the LC filter is close to the switching frequency. For such a system, conventional tools based on average modeling [1], [2], and [3] cannot be applied to investigate stability of the system. The loss of system stability corresponds in fact to a bifurcation phenomenon, which can be studied by a limit cycle analysis [4].…”

Section: Introductionmentioning

confidence: 99%

DC power networks with very low capacitances for transportation systems: Dynamic behavior analysis

Gavagsaz-Ghoachani

Martin

Pierfederici

et al. 2012

2012 IEEE Transportation Electrification Conference and Expo (ITEC)

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Section: Introductionmentioning

confidence: 99%

DC power networks with very low capacitances for transportation systems: Dynamic behavior analysis

Gavagsaz-Ghoachani

Martin

Pierfederici

et al. 2012

2012 IEEE Transportation Electrification Conference and Expo (ITEC)

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“…In addition to distributed power systems, variable-speed drives are also commonly uncounted power electronic systems where stability of the dc-bus voltage has been given much attention in past years [3][4][5][6][7][8][9][10]. The dc bus can be generated by a uncontrolled rectifier or a PWM rectifier.…”

Section: Introductionmentioning

confidence: 99%

“…The dc bus voltage may become unstable when the output impedance of the dc source is high compared to the input impedance of the motor drive at certain frequencies. Such instability can be mitigated by different methods, including the optimization of the dc-bus capacitor [3] and actively damping of the drive dynamics [9]. The analysis is generally performed by assuming ideal ac source.…”

Section: Introductionmentioning

confidence: 99%

Line-frequency rectifier dc-bus voltage instability analysis and mitigation

Bing

Sun

2010

2010 IEEE 12th Workshop on Control and Modeling for Power Electronics (COMPEL)

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Abstract Use of small dc bus capacitors is desirable in variable-speed drives and distributed power systems as it can reduce the size and improve reliability of the system. However, small dc bus capacitors may lead to instability of the dc bus voltage. Such voltage stability problem can occur when the bus is fed from a PWM rectifier or a line-frequency rectifier. This paper considers the case when a line-frequency rectifier is used and presents a method for the analysis of dc bus voltage instability in such systems. Small-signal input impedance of multipulse linefrequency rectifiers is used in conjunction with the ac source output impedance to detect possible instability on the dc bus. Stabilization of the dc bus voltage by a passive damping is presented and compared to other stabilization methods such as increasing dc bus capacitance or placing the damper at the ac input of the rectifier. Experimental results from a 12-pulse rectifier feeding an electronic load that is programmed to emulate constant-power load behavior typical of DPS and variable-speed drives are presented to validate the analysis and design approach.

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“…An inverter motor drive system connected to the grid through an L-C filter and a rectifier may lead to the instability of the dc-link voltage when reducing dc-link capacitance or increasing the inductance of the LC filter [1][2][3][4]. Electrical drives in aircrafts constitute a practical example with long dclink cable and small inverter capacitors.…”

Section: I-introductionmentioning

confidence: 99%

Active stabilization of a poorly damped input filter supplying a constant power load

Awan

Pierfederici

Nahid‐Mobarakeh

et al. 2009

2009 IEEE Energy Conversion Congress and Exposition

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The presence of an LC input filter in an electrical system often results in degradation of dynamic performance and instability of the system. This paper addresses the global stability study of an electrical system comprised of a DC power supply, an LC Filter and an actuator (inverter -Permanent Magnet Synchronous Motor or induction motor). Circle Criterion is used to study the global stability of the system. In the proposed approach the control structure of the electrical system is slightly modified to implement a nonlinear stabilization structure for improving large signal stability of the system and thus allows reducing the DC link capacitance value. An electrical system consisted of an LC input filter connected to an inverter-PMSM designed for aircraft application is treated as an illustrative example.Nomenclature power current voltage Ω rotor angular speed Γ torque dc-link input voltage dc-link input current dc-link output voltage dc-link output current dc-link capacitance dc-link resistance dc-link inductance resonant pulsation frequency line inductance of three phase power supply serial equivalent resistance of power supply I-INTRODUCTIONAn inverter motor drive system connected to the grid through an L-C filter and a rectifier may lead to the instability of the dc-link voltage when reducing dc-link capacitance or increasing the inductance of the LC filter [1][2][3][4]. Electrical drives in aircrafts constitute a practical example with long dclink cable and small inverter capacitors. Indeed, the problem of interaction between two electrical systems in cascade is well known and a lot of work has already been published to explain this phenomenon but essentially in the case of DC/DC converter in cascade with their input filter [5][6][7][8][9][10]. Concerning the interaction between the power supply stage and the inverter motor drive system, some work has already been published for DC/AC applications. In [11], a nonlinear compensation structure is proposed to ensure dc-link stabilisation. Nevertheless as discussed in [12], the drawback of this method is to suppose a perfect control of the torque (disturbance rejection as well as reference tracking) which is not always verified and can lead to instability of the dc-link voltage. In [2,12], the authors take into account the torque dynamic thanks to a simplified dynamic model and propose a modification of the torque control loop to stabilize the dc-link voltage. Even if this solution allows stabilizing the dc-link voltage, it decreases the dynamics performances of the torque loop especially as regard to perturbations rejections. In [13], another approach for drives based on Brushless DC motors (BLDC) is proposed. The authors give a simplified expression for the system input impedance and propose a frequency highpass stabilization block without discussing about the robustness with respect to the measurement noise. In [14] an oscillation compensation technique for linear system is presented for stability investigation.In this paper we present a nonlinear stabilizatio...

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Inverter DC-link stabilizing control with improved voltage sag ride-through capability

Cited by 22 publications

References 10 publications

DC power networks with very low capacitances for transportation systems: Dynamic behavior analysis

DC power networks with very low capacitances for transportation systems: Dynamic behavior analysis

Line-frequency rectifier dc-bus voltage instability analysis and mitigation

Active stabilization of a poorly damped input filter supplying a constant power load

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