Abstract
A novel direct torque control (DTC) strategy is proposed to reduce common- mode voltage in matrix converter (MC)- fed permanent magnet synchronous motor (PMSM) system, by way of replacing some of the active vectors in the traditional DTC switching table with rotating vectors. According to the variation of the direction distribution of the rotating vector with the input voltage phase angle, the range of input voltage phase angle is divided into two intervals. In one interval, some of the active vectors are replaced by rotating vectors; in the other, all vectors used are rotating vectors. The novel DTC switching table is obtained accordingly. Experimental study verified the effectiveness of the new control strategy. The results show that more than 60% of the common-mode voltage can be suppressed, while the waveform quality of torque and current can be reserved.
Highlights
In recent years, under the background of the new scientific and technological revolution and the integration of the global economy, the technical demand of equipment manufacturing industry has been increasing, which has injected new power into the development of motor system
The traditional matrix converter (MC)-direct torque control (DTC) strategy uses active vector, which has the problem of excessive common-mode voltage
At α=0, as shown in Figure 2(a), the phase angles of the rotating vectors +10/-10, +12/-11, +11/-12 are 0, 2π/3, 4π/3, respectively; as a result, the active vectors in the V1, V3, V5 direction in the traditional switching table can be replaced by +10/-10, +12/-11 and +11/-12, respectively
Summary
Under the background of the new scientific and technological revolution and the integration of the global economy, the technical demand of equipment manufacturing industry has been increasing, which has injected new power into the development of motor system. Compared with the large common-mode voltage (CMV) of the active vector and the zero vector, the rotating vector has the natural advantage of producing zero CMV. Due to the characteristic of producing zero CMV, if only the rotating vectors are used to control the PMSM, it will have the natural advantage that the common-mode voltage is almost zero. In [20] a novel switching table with dynamic sector boundary is proposed for DTC to achieve zero CMV with rotating vectors, but the procedure for constructing this switching table is very complicated, and the quality of torque and current waveform is deteriorated significantly as the full control condition cannot be fully satisfied. The effectiveness of the novel DTC strategy is verified by experiments
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