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In general, chopper circuits are necessary for the inverter system whose input voltage fluctuates such as solar power energy, wind power energy, capacitor energy and so on. Therefore, the inverter system becomes larger, the energy losses of power converter increase, and control circuit is complicated. In this paper, to overcome these problems, a control scheme of PWM inverter to get the constant R...
This paper introduces the TMS320LF2407A chip and studies its application in variable frequency speed regulation system. This system uses main circuit of AC-DC-AC voltage type frequency conversion; adopts SVPWM technology; takes TMS320LF2407A as the main control chip; and uses IPM-PW100CVA120 to the main circuit of inverter. The full digital implementation and the experimental Waveform based on TMS320LF2407A...
This paper reviews the control methods that are used to regulate the output voltage of PWM inverters. Based on their structure, the controllers can be categorised under model-based controllers, non-model based and mixed-mode based controllers. The fundamental concepts of these controllers are described along with examples from each category. Furthermore limitations in terms of practical implementation...
A new method of synchronised pulsewidth modulation (PWM) has been applied for control of six-phase (dual three-phase) converter feeding symmetrical induction motor which has two sets of windings spatially shifted by 60 electrical degrees. Basic schemes of synchronised continuous and discontinuous PWM, disseminated for control of symmetrical systems, have been analyzed and compared. It has been shown,...
Multilevel converters have excellent performance in power application, especially in high-power medium voltage fields. To find an effective and general strategy for multilevel and multiphase system is a challenge attracting many researchers. This paper analyses the basic analytical meaning of PWM strategy, which is to implement an analog continuous reference value by means of several available discrete...
Speed control of salient pole permanent magnet synchronous motor (PMSM) is studied based on energy-shaping and port-controlled Hamiltonian (PCH) system theory. Firstly, the PCH speed control model of PMSM is established. Secondly, the desired equilibrium point of the system is obtained based on maximum torque per ampere (MTPA) control principle. Then the speed controllers are designed when the load...
This work presents a new voltage balancing theory for the diode-clamped multilevel converter/inverter system. A complete analysis of the voltage balance theory based on a 5-level back-to-back converter is given. The analysis is based on fundamental frequency switching control and then extended to PWM control, which can extremely lower the harmonic components of the voltage. Simulation and experimental...
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