| 摘要 |
PROBLEM TO BE SOLVED: To enable prevention of the maintaining of a prescribed voltage by permitting a next zero vector to energize a load with a second value in two values, when at least one of the components of voltage monopolistically presents a first valve vectors in accordance with a prescribed time function. SOLUTION: This load 5 has terminals 51-53 connected to branches 41-43 of a power inverter 4. The terminals 51-53 are connected to a first terminal 2 or a second terminal 3 of a voltage source 1. Voltages U1-U3 are applied to the terminals 51-53 of a load 5 through the branches 41-43. The voltages U1-U3 are provided with plural components in a generalized state, and they represent the voltage vectors provided with n pieces of components U1-Un. They are formed by a voltage value U0 generated on the terminals 2 and 3 or '0' in the voltage source 1, and the two different values can be obtained. Namely, a next zero vector is formed to the second value, when the first value is exclusively shown for a prescribe period in accordance with the prescribed function of time when the same value is shown. |
