基于QFT的光电稳定控制系统设计与分析

为了克服模型摄动和各种扰动对机载光电稳瞄系统的影响,提出一种基于定量反馈控制理论(QFT)的光电稳定控制系统设计方法。该方法以方位回路作为讨论对象,基准模型参数值均为方位回路参数值,通过综合考虑被控对象的模型不确定范围(不确定范围取为基准值的±15%)和系统的性能指标,可实现一定范围模型摄动系统的强鲁棒性。在加入模拟幅值为0.06的力矩扰动作用下,设计系统的输出位置误差小于2×1-0 7rad,加入速度扰动,以国外某典型直升机角振动测试频谱作为速度扰动信号,设计系统位置误差限制在8×1-0 7rad内。仿真结果表明:设计的控制系统总体性能优于经典P ID设计的系统。

光电二级稳定系统控制通道融合技术

提出一种光二级稳定粗、精控制通道融合新方案，并与现有粗、精控制通道相互独立二级稳定方案相比较。仿真结果表明，粗、精控制融合方案无论在成本、体积、性能和精度上，都优于现有二级稳定方案。新方案的可行性已通过原理样机得到验证。

光电稳瞄系统内框架动力学模型修正方法研究

为提高光电稳瞄系统内框架结构动力学模型准确度和仿真分析效率,提出了基于多种群遗传退火算法的结构动力学模型修正方法。以某光电稳瞄系统内框架为研究对象,通过动力子结构法建立有限元模型,对比模态测试结果,采用多种群遗传退火算法及相关性分析对有限元模型进行修正,得到全局优化下内框架轴承的六向刚度值,并对修正后的模型进行了实验验证。结果表明,有限元模型与实验结果能较好地匹配,各阶模态相关性在0.8以上,频率误差在9.05%以内,计算效率提高95%以上。最终形成了高效可行的模型修正方案,为光电稳瞄系统内框架结构设计提供了重要的参考。

自行高炮射击线稳定性分析

通过理论分析与仿真计算,对自行高炮系统火炮射击线所采用解算式两轴稳定方式进行了定性、定量分析,通过对自行高炮系统稳定与跟踪结构部分的分析,将该系统的跟踪通道与稳定通道进行了一定的分离,研究在稳定通道里影响稳定解算精度的因素。分析表明(βH,εH)偏离(β,ε)越大、载体姿态角测量值误差越大、εH越大,对βt的解算误差就越大。该系统在载体静止状态下,射击线的指向精度较高。而在摇摆情况下射击线的指向误差在航路捷径处较大,特别是方位上射击线指向误差在整个航路都较大。所建模型通过仿真计算,验证了建模结构与系统分析的正确性。

Transient Stability Analysis of Power System with Photovoltaic Systems Installed

The impact of large-scale grid-connected PV （photovoltaics） on power system transient stability is discussed in this paper. In response to an increase of PV capacity, the capacity of conventional synchronous generator needs to be reduced relatively. This leads to the lower system inertia and the higher generator reactance, and hence, the power system transient stability may negatively be affected. In particular, the impact on the transient stability may become more serious when the considerable amounts of PV systems are disconnected simultaneously during voltage sag. In this work, the potential impact of significant PV penetration on the transient stability is assessed by a numerical simulation using PSCAD/EMTDC.

Transient Stability Assessment of Synchronous Generator in Power System with High-Penetration Photovoltaics （Part 2）

In the previous paper [1], the transient stability of synchronous generator in power system with high-penetration PV （photovoltaic） was assessed by simulation analysis of a single-machine infinite-bus system model. Through the simulation analysis, we have obtained some conclusions in terms of the impact of high-penetration PV on the stability. However, for more accurate assessment of the transient stability, it is necessary to analyze various simulation models considering many other power system conditions. This paper presents the results of the analysis for the transient stability simulation performed for IEEE 9-bus system model, in which the effects of various conditions, such as variety of power sources （inverter or rotational machine）, load characteristics, existence of LVRT （low-voltage ride-through） capability and fault locations, on the transient stability are investigated.

Transient Stability Analysis of Synchronous Generator in Power System with Renewable Power Sources Installed

The impact of large-scale grid-connected renewable power sources, such as wind generators and solar photovoitaic systems, on transient stability of synchronous generators is discussed in this paper. The permanent magnet synchronous generator with variable speed wind turbine is used in the simulation analysis as a wind generator model. The transient stability analysis is performed for IEEE 9-bus system model with high-penetration renewable power sources. The effect of FRT （fault ride-through） capability implemented for each power source on the transient stability is investigated.