交-交变频器相控理论的新发展

The New Improvement of the Phase-controlled Theory for Triac Cyclonverters

总结了传统的单变量(a角)控制理论,提出了相控(a角)加脉宽(b角)的双变量控制理论,给出了自然无环流方式下的基本原则,实现了无环流、无闭锁、无死区、无过零检测的全开环控制系统,确定了级差足够小的有级变频代替无极变频及其优化频率的选择方式,用模糊控制理论作指导进行了输出波形的对称性和正弦度改造。

First,the traditional one-variable control theory is summarized.Then,the control theory of two-variable of phase-controlled and pulse width is put forward.The basic control principle of natural-non-circulation is stated and the specific control method used for cycloconverter is provided.The fundamental principle of non-circulation current are obtained,the noncirculating current,non-blocking,non-dead zone,non-zero detecting and non-feedback full open loop control system has been realized.The method of substituting step frequency conversion with extremely small grade differences for stepless frequency conversion as well as choosing the optimal frequency is determined.The asymmetrical characteristic and degree of sine of the output waveform are modified under the direction of fuzzy-control theory.