Patent ID: 8450957
Filing Date: 2013-05-28
Classification: H02P

Abstract:
1. A space vector based synchronous modulation method, comprising: sampling, by a sampling unit of a microprocessor, the frequency f of a reference voltage vector, and retrieving a carrier wave ratio N from a relationship table of frequencies and carrier wave ratios by using the frequency f; deriving, by a first calculation unit of the microprocessor, an angle Δθ that the reference voltage vector has undergone from Δθ=2π/N and a modulation angle θ retrieving, by a retrieval unit of the microprocessor, a modulation ratio m from a modulation ratio vs. frequency graph; calculating, by a second calculation unit of the microprocessor, output angles of three fundamental voltage vectors synthesizing the reference voltage vector from the modulation angle θ comparing, by a comparison unit of the microprocessor, a variation Δθ