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Difference between the traditional ideal model and the actual nonideal converter is a problem that cannot be ignored to model switching converters.

传统的理想模型和实际电路之间的偏差是开关变换器建模不可忽视的问题。

The problem of PI controller design for the multi-input and multi-output system is transformed to that of static output feedback controller design via the new state variable. As to the problem of the static output feedback, a new LMI-based sufficient condition of the controller is presented in this thesis. We can gain the multivariable PI controllers just solving one LMI inequality. The numerical example is provided to illustrate the proposed design approach. 3.The H_∞ robust control is able to solve the multivariable problem, also the control problem characteristic of the modeling error, parameters uncertainties and unknown perturbation, Its application research in the power electronics is beginning now. Considering the characteristics of the PWM DC-DC converters, a multivariable PI controllers which is based on H_∞ Performance Index is designed.

通过构造新的状态变量，可以将多输入多输出系统的PI控制器设计问题转化为静态输出反馈控制问题，利用后者的成熟理论来设计控制器；本文在问题转化后采用更为简便的算法，只需通过求解一个LMI不等式，就能求取基于H_∞性能指标的多变量PI控制器参数，实例验证了算法的有效性。3.H_∞鲁棒控制具有处理多变量问题的能力，可解决具有建模误差、参数不确定和干扰未知系统的控制问题；它在电力电子学中的应用研究刚刚开始。

Hearing about Oleo's buffers being incorporated into completed products at their Chinese factory, and Converteam's power converters being used in Chinese wind-turbines also illustrated for me the growing partnership between the UK and China - manufacturing in both countries, sharing technological skill and joining commercial efforts to develop world-beating solutions for global customers.

Oleo缓冲器的应用成品在中国工厂中生产，Converteam的变电器在中国的风力涡轮发电机，这些都让我认识到中英公司合作的不断深化－同时制造，技术分享，合作努力向全球用户提供世界级的技术解决方案。

Application of an optimal control strategy to a new type of HVDC system based on voltage source converters.

一种优化控制策略在基于电压源换流器的HVDC系统中的应用。

It is difficult to obtain the dynamic models of converters, overlong overhead HVDC lines and passive filters in audio frequency.

然而，由于运行工况及气候的影响，难以求取换流器及长距离高压架空线路在音频带内的动态数学模型。

In their study, the researchers connected the battery pack and ultracapacitor bank in parallel to the DC link with bi-directional two quadrant buck-boost converters.

在他们的研究中，研究人员连接电池和超级电容器银行在平行直流环节双向两个象限降压升压转换器。

The research on the parallel operation of power converters has become one of the hot issues in the field of power electronics.

电力电子变换器模块的并联技术现己成为电力电子领域的研究热点。

Because of switching actions, power-factor- correction Boost converters are essentially piecewise smooth nonlinear systems, which leads to the occurrence of fast-scale bifurcations.

由于开关的动作，功率因数校正(power-factor-correc- tion，PFC) Boost变换器本质上是分段光滑的非线性系统，从而导致快时标分岔的产生。

The unified discrete iterative map model of peak current and valley current controlled buck, boost, and buck-boost converters is established, and the unified piecewise smooth iterative map and their corresponding characteristics equations are also derived.

本文建立了峰值电流和谷值电流控制Buck，Boost，及Buck-Boost变换器的统一离散迭代映射模型，并导出了统一的分段光滑迭代映射方程及特征值方程，通过数值仿真得到了占空比变化时的正、逆分岔图和Lyapunov指数谱。

By piping together value converters it is much easier to make them reusable in a number of ways.

通过管道共同价值转换器就可以更容易使他们在许多方面可重复使用。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。