变换器

The technique made full use of the characteristic of PR controller which can realize zero steady-state error in AC input signal in stationary frame. In the method, the active and reactive current component in the vector control strategy were transformed in the stationary frame to achieve the objective of keeping the DC-link voltage constant, adjusting the power factor and decoupling the active and reactive power. Compared with conventional double close-loop proportional integral controller, the PR technique is better in harmonic compensation without the complex rotating frame transformation and the couple or feedback voltage which is easily influenced by temperature and circuit parameters. The control algorithm is easy to be realized while the robustness and power quality is improved.

该方法充分利用了PR控制器能够在静止坐标系下对交流输入信号无静差控制的优势，将矢量控制策略下的有功电流和无功电流分量转换到静止坐标系下进行调节，实现网侧变换器维持直流电压稳定和调节功率因数的控制任务和双馈电机有功、无功功率的解耦控制，与传统的双闭环PI控制相比，该策略无需繁琐的坐标旋转变换，不存在受温度及电路参数影响的耦合项和前馈补偿项，且易于实现对系统低次谐波电流的补偿，减小了控制算法实现难度，提高了控制系统的鲁棒性和电网电能质量。

To achieve a good performance both statically and dynamically, closed loop control method has to be applied.

为了使变换器具有良好的动静态特性，变换器必须实现闭环控制。

This paper has presented a module-cascaded system for multi-coil direct-drive permanent magnet wind generator system with high voltage output, eliminating the grid-side step-up transformer.

针对大容量风电机组的中压变换问题，本文研究一种基于多绕组发电机的模块化级联型变换器，通过模块单元级联实现中压输出，从而省去升压变压器。

And adjusting the parameters, it can be a binary, trinary or N-nary A/D converter arbitrarily.

虽然其精度目前还未超过现有的A/D变换器，但这是一种全新意义上的A/D变换，值得进一步研究。

This paper presents basic theory of Sparse Matrix Converter, controlling method and zero current commutation; Lastly, this paper provide the simulink waveforms based on SIMULINK.

本文介绍了稀疏矩阵变换器的基本原理、控制策略、零电流变换方法，同时给出了基于SIMULINK 的仿真波形。

Its application to SPC circuits gives the same results as those obtained by the state-space average approach, which is proposed by Middlebrook and Colk, but our approach is also in the form of CMNA.

在分析方面，通过应用加权平均和小信号近似手段，我们建立了KL平均法，导出了开关变换器电路的S域分析的紧凑型改进节点方程，为人们应用拉普拉斯变换这一得心应手的工具来研究这类周期性开关电路提供了又一种方法。

The critical part of this sight is a holographic optical elements combined with a lensless Fourier transform hologram and a holographic beam transformer.

瞄准具的核心部件是由一块无透镜傅里叶变换位相全息图和一块全息光束变换器组成的全息光学元件。

An Auxiliary Resonant Commutated Pole circuit is introduced,and its working principle and process are analyzed.

1引言辅助谐振变换极软开关电路在大率功变换器领域中有很好的应用效果。

A composite cascade multilevel converter composed of a main converter and an accessorial one is presented which is well suited for application in high voltage situations with high performance requirements.

针对高电压、高性能功率变换场合的需要，提出了一种主从组合式多电平变换器的拓扑组合结构，具有输出波形质量高、输出电压等级高和功率转换效率高等特点。

This thesis firstly discusses some research focus of high-frequency power supply and variable circuit topologies are compared here. Then it emphasizes the operating principle of phase shift full bridge converter and realization of soft switching techniques.

首先简单讨论了目前高频开关电源的研究热点，对各种变换电路拓扑结构形式进行了分析比较，然后重点分析了移相全桥变换器的工作原理和软开关技术的实现。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。