基于虚拟同步发电机双机并联系统的参数自调节优化控制策略

针对虚拟同步发电机(VSG)双机并联系统在采用固定的转动惯量及阻尼系数时无法兼顾有功功率振荡和频率波动的问题,该文提出一种参数自调节优化控制策略。首先,建立VSG双机并联系统的小信号模型,分析转动惯量及阻尼系数对输出有功特性的影响;其次,在满足系统动稳态性能的转动惯量及阻尼系数限定取值范围内,根据转子角速度变化率及其偏差量引入了改变转动惯量及阻尼系数的参数自调节优化控制;最后,通过仿真结果验证了所提控制策略的有效性。该策略在保证系统稳定运行的同时,既可抑制VSG并入交流母线过程中的有功振荡,亦可提高频率的支撑能力。

节水灌溉自动化技术分析及优化控制调节

本文从我国基本国情出发,论述了节水灌溉自动化技术在我国的应用背景及节水灌溉自动化技术原理与技术装备,并在此基础上,提出了控制和调节节水灌溉设备系统的参考性优化方案。

A Parameter Determination Method of Distribution Voltage Regulators Considering Tap Change and Voltage Profile

This paper proposes a parameter determination method of distribution voltage regulators load ratio control transformers （LRT） and step voltage regulators （SVR） considering the tap change and voltage profile. The method takes two procedures in order to simplify the optimization problem and to reduce calculation time. One is to simultaneously determine the control parameters of LRT and SVR minimizing voltage violations and voltage variations. The algorithm is based on particle swarm optimization （PSO）, which is one of non-linear optimization methods by using a concept of swarm intelligence. Another is to determine the dead-band width of LRT and SVR on the basis of bi-evaluation of tap change and voltage margin. The concept of a Pareto optimal solution is used for the decision of the best dead-band width. As the results of numerical simulations using distribution network model, the validity of the proposed method has been affirmed.

计算机远程测控在集中供热系统中的应用

计算机监控技术应用在集中供热系统中是供热节能和智能化发展的必然趋势。本文结合邢台市供热监控实例介绍了集中供热监控技术的硬件组成、组件功能、控制策略及采用该系统给集中供热所带来的有益改变,同时对应用监控系统的实际节能效果进行了分析。