多能源互补独立电力系统的控制策略仿真研究

多能源互补电力系统是解决偏远地区供电问题的有效途径之一,西藏阿里地区比较适合建设光电、储能装置、水电和柴油发电互补的独立电力系统。针对光伏电站,提改进PQ下垂控制与功率外环控制相结合的综合控制策略。针对不同的控制目标,设计两种功率外环控制策略。利用电力系统分析软件DIgSILENT/PowerFactory对该独立电力系统及控制策略进行仿真;分析不同控制策略下电网的动态响应特性,并研究V/f响应功率外环控制策略下光伏电站独立支撑电网的能力。仿真结果表明,光照强度发生剧烈变化以及大容量设备启停时,系统能够快速跟踪动态响应变化,其电压和频率均能可靠快速地恢复至正常水平。

面向远洋海岛新能源自治微网的双重化备用电源规划

针对远洋海岛自治微网的负荷备用问题,提出基于概率性序列运算的双重化备用电源规划方案。首先,建立风机、光伏发电和负荷的概率分布函数模型,利用概率性序列运算方法求取电力不足概率这一可靠性指标。接下来,根据微型燃气轮机和柴油机各自的特性及相关的配置和燃料成本高低,研究最大化利用2种备用机组优势的备用策略。最后,结合远洋海岛资源补给及孤岛运行的实际情况,以最大程度满足可靠性为前提,求解备用机组及储气站的最优规划容量。仿真结果表明,所求解的机组及配套设备能够满足岛上日常以及极端天气的备用功能。与其他策略的对比分析表明,在考虑负荷惩罚因素后,该文提出的策略具有更优越的经济性。

Coordinative Optimization of Hydro-photovoltaic-wind-battery Complementary Power Stations

The depletion of fossil energy and the deterioration of the ecological environment have severely restricted the development of the power industry.Therefore,it is extremely urgent to transform energy production methods and vigorously develop renewable energy sources.It is therefore important to ensure the stability and operation of a large multi-energy complementary system,and provide theoretical support for the world’s largest single complementary demonstration project with hydro-wind-PV power-battery storage in Qinghai Province.Considering all the multiple power supply constraints,an optimization scheduling model is established with the objective of minimizing the volatility of output power.As particle swarm optimization(PSO)has a problem of premature convergence and slow convergence in the latter half,combined with niche technology in evolution,a niche particle swarm optimization(NPSO)is proposed to determine the optimal solution of the model.Finally,the multiple stations’coordinated operation is analyzed taking the example of 10 million kilowatt complementary power stations with hydropower,wind power,PV power,and battery storage in the Yellow River Company Hainan prefecture.The case verifies the rationality and feasibility of the model.It shows that complementary operations can improve the utilization rate of renewable energy and reduce the impact of wind and PV power’s volatility on the power grid.

一种应用于直流电源的热替换与冗余新技术

文中以一个DC/DC电源子系统的设计为例,说明了应用在DC/DC变换器模块上的热替换与冗余技术的工作原理。特别提出一种称为互补隔离的新冗余技术,以此来解决传统输出冗余二极管的隔离功率损耗大的缺陷问题。互补隔离技术法为在输出二极管两个端子上并联功率电磁继电器的一对常开触点,并用冗余控制信号对触点的闭合或释放状态进行控制。