secondly, through establishing the small-signal model, the voltage loop and the current loop are designed . the effect of the loop parameters, varieties of frequency and rms to the system are analyzed 通过逆变系统的小信号建模,设计了闭环参数,并详细分析闭环参数、频率和电压变化对系统的影响,前后级阻抗的匹配关系。
at first, it introduces the method of loop parameters, including gain of phase detecting, gain of loop filter and frequency sensitivity, then simulations are done under different structures and parameters . according to the results of simulation, loop structure is decided 在此章中,首先是详细地讨论了环路中各个参数的计算;接着是对各种参数和结构进行了性能仿真,并由此决定了环路的结构。
by using the correction approach of vary-transfer function for designing parameter of closed-loop in the area of power electronics, the system could work reliably under wide range input voltage conditions . compared with the design method of closed-loop parameter, the advantages of the correction approach of vary-transfer function were highlighted and testified by simulation and experimental results 为了使系统能够在宽电压输入范围内稳定正常工作,本文实现了提出的变传递函数系统校正方法在电力电子闭环参数设计中的应用,并与闭环参数设计方法进行了比较,指出了该方法的优点,并通过仿真和实验验证了该方法的正确性。
it can be deduced from the characteristics of ilpll circuit that injection-locking bandwidth is not only related to the injection-locking bandwidth without feedback loop, but also related to the characteristics of frequency mixing, loop gain and the change of the loop phase . thus, the needed bandwidth can be obtained by adjusting the loop parameters . and the phase noise characteristics are mainly determined by loop transmission factor 由ilpll电路特性的推导得出:注入锁定带宽不仅跟开环时的注锁带宽有关,而且与混频特性、环路增益以及环路相位变化相关联,可以通过调节环路的参数得到所需带宽;相噪特性主要由环路传输因子决定,可以通过调节环路滤波得到比开环注入锁定相噪更优的特性。
lastly, establish the rigid-body spaceship attitude kinematics and dynamics equations, and primarily design the spaceship attitude law including limit loop parameters and two kind switch curves . analyze the astronaut ’ s disturbance moments . put the disturbance moments of typical astronaut ’ s push-off act as the input datas of the control system simulation, and analyze the response of the attitude control system after disturbed 最后,建立刚体飞船姿态运动学及动力学方程,并对飞船姿态控制律进行了初步的设计,包括极限环参数的设计和两类典型的开关曲线的设计;对航天员扰动力矩进行了分析;以典型的航天员推离动作对飞船的扰动力矩作为控制系统仿真的输入参数,分析姿态控制系统受到扰动后的响应。