电网

The paper also study the variable control of uncertain system and the variable control of time lag system. At last adopt this discrete approach law in Series-wound Active Power Line Conditioner control.

同时对不确定性离散变结构系统和时间滞后不确定系统进行了分析；最后用离散变结构控制方法对串联型有源电网调节器进行控制。

As the implementation of power generation separating from grid company and the establishment of power market, the internal and external environment, organization and management style of provincial power grid company have been changed greatly. The existing performance management system of provincial power grid company is not able to adapt to the demands of current business management and internal and external environment. As an important part of the managing and controlling system, performance management system has to be adjusted to adapt to the changes.

随着中国电力体制改革&厂网分开&的实施和电力市场的建立，省级电网企业的内外环境、组织结构及管理模式等都发生了较大的变化，原省级电力公司的绩效管理体系已不适应目前企业经营管理和内外环境的需要，作为管理控制系统重要组成部分的绩效管理系统也应随之进行适应性调整。

Since "separating power plants from networks by price competition", as the main measure of the reform for power system, has been developed gradually in our country, the management of the corporations is required more.

随着电力改革深入进行，发电企业与电网分开管理、竞价上网，这对企业的经营管理提出了更高要求。

Through the analysis of practical structure of network and character of generators, considering the generator unit's self-exciting and the overvoltage of the no-load circuit in course of power transmission, a counterplan of Black-Start is drafted out under emergency accident.

通过对这个地区的网架结构和机组特性的分析，并考虑了机组的自励磁问题和送电过程中空载线路的过电压问题，编制了巴盟地区电网的黑启动的预案。

Intelligent control technology of large-scale equipments in comprehensive mechanized coal mining face (including the electric explosion-proof technique, control circuit design of essence safety type and double-engine double-speed dragging heavy load control technique of scraper conveyer); no exceeding limit gas safety and high efficiency emission technique (including air flow control strategy, control method, and etc.); failure protection technique for safe power supply of mine power grid (including two-grade selective electric leakage protection and phase sensitive protection technique, etc.).

关键技术分别为多局部通风机故障诊断和冗余控制技术（包括掘进工作面供电系统多源信息融合、故障测寻、故障诊断、多局部通风机三重冗余控制方法和控制策略等）；综采工作面大型设备的智能控制技术（包括电气防爆技术、本质安全型控制电路设计、刮板输送机双机双速拖动重载控制技术等）；瓦斯无超限安全高效排放技术（包括风量控制策略、控制方法等）；矿井电网安全供电的故障保护技术（包括两级选择性漏电保护和相敏保护技术等）。

In case maintenance workers are not informed of the incident, the stranded person will have to stayin the lift over night or a few hours. In order to ensure the safety of lift users, our technicians, after over 10 years of persistent efforts for improvement and perfection, have put forward a new device for lift emergency cases. This device, with an intelligent trouble tracing system to trace lift troubles and electricity failure, is able to automatically perform rescue work and ensures lift users's afety by performing timely rescure.

另外，如果电梯维保人员收不到困梯的信息，乘客被困在电梯里一个晚上、几个小时是可想而知的事，为了保障电梯乘客的人身安全，我厂科技人员经过十余年不懈努力，不断改进和完善，推出了新一代电梯应急装置，采用了电梯故障智能跟踪系统，随机检测电梯故障及电网故障，进行智能化的自动救援工作，确保电梯的被困乘客能得到安全、及时的自动救援。

To solve the above problems, a novel resonance injection type hybrid active power filter is presented, it allows the energy exchange between the DC-side capacitor and grid, DC-side voltage will be stabilized after the proposed control method base on the regulation of reactive current is adapted. On the other hand, a new current control method is proposed which is based on the control of error between injection current and harmonic current compensated by passive power filter using recursive PI.

在此基础上结合提出的基于基波无功电流闭环调节的直流侧电压控制方法，保证了直流侧电压的稳定；提出了采用递推积分将无源滤波器作用后电网谐波电流与注入支路补偿电流进行闭环比较控制以获得参考电流的方法，减小了误差，提高了系统的控制精度。

And also,the method to reliability coefficient calculation is put forward.

近几年，随着河南电网结构的发展以及负荷的迅速增长，根据计算，一些220kV线路的最大有功功率可能达到650MW。

Capacitive rectifier, a traditional rectifier for electronics instrument, can result in a lot of input current harmonics, which brings the main to harmonics distortion.

传统电子设备的电源输入端采用二极管整流和电容滤波，其输入电流含有大量的奇次谐波，对电网造成巨大的谐波污染。

A novel scheme based on wavelet transform and its reversible transform of fault recording data compression in power systems by adopting lifting algorithm is presented in this paper.

利用提升算法实现了一个基于小波变换的电网故障录波数据压缩的新方案，从采样频率的角度首次给出确定最优分解层数的公式，说明了压缩比与频率的关系；结合实际录波数据，选定误差上限后，给出了通用阈值法中参数的优化取值；对比分析了软硬阈值处理方法。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。