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METHOD AND APPARATUS FOR OPERATING AN ASYCHRONOUS MOTOR FED BY A CURRENT-SOURCE INVERTER DURING POWER FAILURE
METHOD AND APPARATUS FOR OPERATING AN ASYCHRONOUS MOTOR FED BY A CURRENT-SOURCE INVERTER DURING POWER FAILURE
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机译:在断电期间操作由电流源逆变器供电的异步电动机的方法和装置
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摘要
In order to maintain the flux in an asynchronous machine supplied by an intermediate-link converter in the event of a network disturbance, the converter is initially blocked at the beginning of the network disturbance. After the intermediate-link current has decayed, the timing of the free-running converter on the machine side and the ignition of two series-connected controlled rectifiers of the converter on the network side are effected. The flux still present in the machine induces in the stator circuit closed in this manner a machine current which is controlled by a supplemental current controller in an operation slightly on the generator side, whereby, at the expense of the kinetic energy of the synchronized machine, a current through the circuit is generated which is required for covering the dielectric losses and for maintaining the desired flux.
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