永磁同步電機直接轉(zhuǎn)矩控制受定子電阻變化影響，進而影響調(diào)速系統(tǒng)的精度。本文采
用遺傳算法動態(tài)調(diào)整直接轉(zhuǎn)矩控制的調(diào)速系統(tǒng)控制器參數(shù)的策略，使控制器參數(shù)及轉(zhuǎn)矩給定值隨轉(zhuǎn)速的波動而調(diào)整，克服電阻變化引起磁鏈控制器輸出不準確，達到穩(wěn)定輸出轉(zhuǎn)速的目的。該策略在定子電阻變化較大情況下，仍具有高控制精度。仿真結(jié)果驗證了這一遺傳算法永磁同步電機直接轉(zhuǎn)矩控制調(diào)速系統(tǒng)控制策略的有效性。
關(guān)鍵詞：永磁同步電機；直接轉(zhuǎn)矩控制；定子電阻；轉(zhuǎn)速；遺傳算法
Abstract: The direct torque control for permanent magnet synchronous motor is affected by the variation of stator resistance, and consequently the accuracy of speed adjusting system. Resistance estimator was usually used to solve the problem. The paper presented a novel scheme with genetic algorithms to adjust the parameters of PI controller in a direct torque controlled speed adjusting system, which made the parameters and reference torque vary with rotor speed measured. Overcoming the deviation caused by resistance variation, the scheme could choose a proper voltage space vector, and then made the speed stable at reference. The scheme was free of the affect of stator resistance variation and was with high accuracy even though a big change of resistance. Simulation results illustrated the effect of the scheme.
Key words: Permanent magnet synchronous motor; Direct torque control; Stator resistance;
Speed; Genetic algorithms