基于混合谐波注入的潜水感应电机电磁噪声削弱

针对感应电机在变频供电时会在绕组中产生时间谐波而导致电机的电磁振动和噪声增大的问题，提出了一种采用混合谐波注入的改进型正弦脉宽调制控制策略。以一台1 120 kW的潜水感应电机为研究对象，通过对电机进行3、9次混合谐波注入，削弱了电压的调制波和载波谐波及其边带谐波分量，从而降低了电机的振动和噪声。对3、9次混合谐波注入方法中的谐波占比系数进行优化，进一步强化了对边带谐波的削弱效果，整体降低了电机噪声。最后通过对采用混合谐波注入方法的电机与优化前的常规电机进行铁耗、铜耗等方面的性能对比，验证了所提策略在不影响电机的基本性能的前提下，有效削弱了电机的电磁噪声。

Electromagnetic Noise Reduction of Submersible Induction Machine Based on Hybrid Harmonic Injection

In order to solve the problem that induction machines generate time harmonics in the windings when supplied at variable frequency, which leads to the increase of electromagnetic vibration and noise, an improved sine pulse width modulation control strategy using hybrid harmonic injection is proposed. A 1 120 kW submersible induction machine is taken as the research object, by injecting 3rd and 9th hybrid harmonics into the machine, the modulation wave of voltage, carrier harmonics and their side harmonics components are weakened, thus reducing the vibration noise of the machine. The harmonic ratio coefficients in the 3rd and 9th hybrid harmonics injection methods are optimized to further strengthen the weakening of sideband harmonics and reduce the machine noise overall. Finally, by comparing the performance of the machine with hybrid harmonic injection method and the conventional machine before optimization in terms of iron consumption and copper consumption, it is verified that the proposed strategy effectively attenuates the electromagnetic noise of the machine without affecting the basic performance of the machine.