在建立电流源型PWM变流器稳态数学模型的基础上,分析了系统的耦合关系,提出了一种基于小偏量线性化的前馈解耦控制方案。
On the basis of the stationary state mathematical model of a PWM current-source converter, the paper analyzes the coupling of a converter and presents a simple decoupling feedforward control method.
结果表明谐波及无功检测信号只不过是电容电压闭环系统中的一个前馈补偿信号,其存在不但不能提高反而影响谐波及无功的稳态和动态补偿精度。
It is concluded that the harmonic and reactive current detection behave as just a feed-forward signal in this closed-loop, and it is incapable of improving the compensation accuracy in steady-state.
在稳态试验的基础上,对转子过前两阶临界转速的振动抑制进行了研究,并实施开环瞬态振动控制。
On the basis of steady state tests, the vibration suppression of the rotor through the first two critical speeds has been done.
在识别中采用了实模态识别法,识别出前13个模态参数,并与稳态激振、环境振动及有限元计算进行了比较,结果是比较符合的。
Real modal parameter identification has been used and 13 modes are identified. The obtained modes are compared with the results from steady exciting, ambient vibration and FEM calculation.
介绍一种能够适应介质速度横向变化的非稳态相移算子及其叠前深度偏移方法。
The paper introduces a prestack depth migration by nonstationary phase shift method suitable for laterally variable velocity.
所有患者万古霉素治疗5天或以上的,应至少有1稳态血药浓度槽前第四剂量测量。
All patients treated with vancomycin for 5 days or more should have at least 1 steady-state trough serum concentration measured just before the fourth dose.
该系统是一种带前馈环节的复合闭环系统,它解决了稳定性与稳态精度的矛盾,提高了控制精度。
The system is a combined close loop system with forword feed control device. It can resolve the contradiction between stability and steady accuracy, and rise the control accuracy.
用多台起振机进行稳态强迫振动试验,测定了该坝前十阶自振频率、阻尼和振型。
The first ten natural frequencies, damping ratios and mode shapes of the dam were measured through steady forced vibration test using multiple vibrators.
这一算法简单,易于在线实时控制,并且消除了美坂佳肋所给前馈最优算法所产生的稳态误差。
It is simple for calculation, easy to be implemented for on line control, and free from steady state error produced by the algorithm given by Yoshisuke Misa-ka.
方法二针对状态空间巨大的情况,先以一定的标准对状态空间进行截尾,再应用马尔可夫模型获得系统的稳态可用度、首次故障前平均时间、稳态故障频度等可靠性指标。
The other first truncates the state space according to some criterion in view of the explosive number of states. Markov model is introduced to obtain some important reliability indexes.
方法二针对状态空间巨大的情况,先以一定的标准对状态空间进行截尾,再应用马尔可夫模型获得系统的稳态可用度、首次故障前平均时间、稳态故障频度等可靠性指标。
The other first truncates the state space according to some criterion in view of the explosive number of states. Markov model is introduced to obtain some important reliability indexes.
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