The design process of a holistic control system for a MMC to feed variable-speed drives is proposed in this paper. The performance of the control system is finally validated by measurements on a lowvoltage MMC prototype, which feeds a field-oriented controlled induction machine For high-power drive applications the modular multilevel converter (MMC) is an upcoming topology especially in the medium voltage range. First, from the analysis of the equivalent circuits the design of the current control for the independent adjustment of several current components is derived. Second, the current and voltage components by the investigation of the transformed arm power components for balancing the energies in the arms of the MMC are identified systematically. At minimum necessary internal currents over the complete frequency range The control system ensures a dynamic balancing of the energies in the cells of the MMC. Simultaneously, all other circulating current components are avoided to minimize current stress and additional voltage pulsations. . Here we are using the fuzzy controller compared to other controllers i.e. The fuzzy controller is the most suitable for the human decision-making mechanism, providing the operation of an electronic system with decisions of experts. In addition, using the fuzzy controller for a nonlinear system allows for a reduction of uncertain effects in the system control and improve the efficiency. A cascaded structure with subordinated current control loops and filter-based energy control loops is proposed in this paper. Simulation results are shown below

Cascaded Control System of the Modular Multilevel Converter for Feeding Variable Speed Drives

Reduction of torque ripple in an electrolytic capacitor-less BLDC motor drive by simultaneous speed and torque control method

Small capacitor motor drive systems have received increased attention due to higher reliability and longer lifespan. However, small capacitor motor drive systems suffer from poor dynamic performance and larger torque ripple. In this paper, a combined control method is presents to improve the performance of small capacitor motor drive systems. On the one hand, this combined control strategy adopts injected harmonic current to reduce the fluctuation voltage on the DC-link, which provide better conditions for high-performance operation of permanent magnet synchronous motor. To satisfy the harmonic standard of IEC61000-3-2, the guideline of injected harmonic current is deduced according to motor power and the input power factor. On the other hand, an improved repetitive control in parallel with PI control is applied into motor control to effectively suppress motor torque ripple under the condition of the periodic pulsation voltage on the DC-link. In addition, this control method has good dynamic motor performance. Experiments are conducted, and the results verify the feasibility and effectiveness of the combined control strategy.

/pdf/torque-ripple-reduction-of-pmsm-with-small-capacitor-drive-1f9s0swry3.pdf

Torque Ripple Reduction of PMSM With Small Capacitor Drive Systems Based on Combined Control Method

Reliability evaluation of power MOSFETs used for an initial charge method using multiple short-circuits in each leg

This paper presents an improved switching methods of the Surface Permanent Magnet Synchronous Motor drive with an AC-DC converter in the DC link and a combined control technique with Pulse Amplitude Modulation and Pulse Width Modulation. A modified six-step control and high frequency current injection synchronously with the rotation speed can cancel out the harmonic current.

High speed six step PAM control of SPMSM with PFC converter

This paper proposes a method for direct predictive control of DC-link current using the interior permanent magnet synchronous motor (IPMSM) discrete equation for electrolytic capacitorless inverters. Electrolytic capacitorless inverters do not have any electrolytic capacitors or power factor correction circuits. Therefore, direct DC-link current control is proposed as a method for controlling the the DC-link current of the inverter to improve the input power factor. However, in the direct DC-link current-control method, an error occurs in the DC-link current due to the one-sample delay in the voltage output. Because of this error, a current harmonic is generated in the input current. The direct predictive DC-link current control proposed in this paper reduces this error, thus satisfying the input-current-harmonics regulation value of IEC 61000-3-2.

/pdf/predictive-direct-dc-link-current-control-of-ipmsm-drive-x58dnge6mz.pdf

Predictive Direct DC-link Current Control of IPMSM Drive System Using Electrolytic Capacitorless Inverter for Fine Harmonics Suppression

To reduce the capacitance of the DC-link capacitor in an AC-DC-AC system, a single-phase to three-phase electrolytic capacitor-less inverter is proposed. The inverter is used to control both the motor and source currents. In particular, it is necessary to sinusoidally control the source current to meet the source current harmonics guideline. The DC-link voltage becomes an absolute value of the source voltage and is almost zero near the zero crossing. As the output voltage is also zero near the zero crossing, the motor current response deteriorates in the method of controlling the source current sinusoidally. The motor current near the zero crossing flows because of the back electromotive force, and the copper loss is significantly large, particularly in the high-speed region. This paper analyzes the motor current response in the zero-output-voltage region and proposes a method to suppress the motor current increase. The proposed method is validated by conducting simulations and experiments.

Suppression method of increase in motor current at zero output voltage for an electrolytic capacitor-less inverter

In this paper, predictive control of DC-link current is proposed based on the interior permanent-magnet synchronous motor (IPMSM) discrete equation for electrolytic capacitorless inverters. In electrolytic capacitorless inverters, the electrolytic capacitor and power factor correction circuit are not used. Therefore, control of the DC-link current of the inverter to improve the input power factor of direct DC-link current control has been proposed as a method of controlling the DC-link current of the inverter. However, control errors occur in the DC-link current due to sampling error in the motor current. Due to this control error, a resonant current is generated in the inductance and the DC-link capacitor. The predictive control of the DC-link current proposed in this paper reduces this control error. The effectiveness of the proposed method is confirmed by experiments.

Predictive DC-link Current Control Based on IPMSM Discrete State Equation for Inverter without Inductor or Electrolytic Capacitor

In this paper, the predictive control of DC-link current based on the IPMSM discrete equation for electrolytic capacitor-less inverter is proposed. In electrolytic capacitor-less inverters, electrolytic capacitor and power factor correction circuit are not used. Therefore, it is necessary to maintain both the input power factor and the motor control by controlling the inverter. Instantaneous voltage control has been proposed as a control method to achieve both motor control and input power factor improvement. In the instantaneous voltage control method, the DC-link current driving the motor is controlled. However, control error occurs in the DC-link current due to the sampling error in the motor current. Due to this control error, a resonance current is generated in the inductance and the DC-link capacitor. The predictive control of DC-link current proposed in this paper reduces this control error. The effectiveness of the proposed method is confirmed through simulation.

Predictive control of DC-link current based on IPMSM discrete equation in electrolytic capacitor-less inverter

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Predictive Direct DC-link Current Control of IPMSM Drive System Using Electrolytic Capacitorless Inverter for Fine Harmonics Suppression

Suppression method of increase in motor current at zero output voltage for an electrolytic capacitor-less inverter

Predictive DC-link Current Control Based on IPMSM Discrete State Equation for Inverter without Inductor or Electrolytic Capacitor

Predictive control of DC-link current based on IPMSM discrete equation in electrolytic capacitor-less inverter