Development of Simulated Testbed for Electrical Power Subsystem of a Certain Kind of Satellite

In order to testify and examine the ability and correctness of an expert system for diagnosing the faults in the electrical power system of a certain kind of satellite, the authors have developed a simulated testbed according to the operational principle of the electrical power system. This paper takes the solar battery array as an instance to introduce the designing principle of its hardware circuits, and presents the methods to design the interface and the software program of the single-chip microprocessor system. The software scheme of the upper computer is introduced at the end of this paper. It has been proved that this simulated system could effectively achieve the complete functions coupled with the simple design by using of various mature techniques in the fields of electronic circuits, single-chip microprocessor and numerical emulation.

Dynamic self-adaptive ANP algorithm and its application to electric field simulation of aluminum reduction cell

Region partition(RP) is the key technique to the finite element parallel computing(FEPC),and its performance has a decisive influence on the entire process of analysis and computation.The performance evaluation index of RP method for the three-dimensional finite element model(FEM) has been given.By taking the electric field of aluminum reduction cell(ARC) as the research object,the performance of two classical RP methods,which are Al-NASRA and NGUYEN partition(ANP) algorithm and the multi-level partition(MLP) method,has been analyzed and compared.The comparison results indicate a sound performance of ANP algorithm,but to large-scale models,the computing time of ANP algorithm increases notably.This is because the ANP algorithm determines only one node based on the minimum weight and just adds the elements connected to the node into the sub-region during each iteration.To obtain the satisfied speed and the precision,an improved dynamic self-adaptive ANP(DSA-ANP) algorithm has been proposed.With consideration of model scale,complexity and sub-RP stage,the improved algorithm adaptively determines the number of nodes and selects those nodes with small enough weight,and then dynamically adds these connected elements.The proposed algorithm has been applied to the finite element analysis(FEA) of the electric field simulation of ARC.Compared with the traditional ANP algorithm,the computational efficiency of the proposed algorithm has been shortened approximately from 260 s to 13 s.This proves the superiority of the improved algorithm on computing time performance.

电推进粒子网格法模拟中计算加速方法的研究综述

粒子网格法(PIC)模拟电推进装置等离子体时具有很强的第一性,但是模拟过程中计算负载很大,故PIC模拟的计算加速方法不可或缺。本文从电推进装置基本性质、低温等离子体物理特性和PIC算法特点作为切入点,明确了PIC方法在电推进装置模拟过程中计算负载高的原因;结合国内外的研究现状,从建模、时空尺度、算法与并行三个层面介绍了对应计算加速方法的原理和效果;对各类计算加速方法进行了总结和展望。

新能源电力系统细粒度并行与多速率电磁暂态仿真

随着可再生能源的快速发展,电力系统设备类型越来越多,系统振荡特征越来越复杂,对电磁暂态仿真的精度和效率提出了更高要求。基于大规模集成电路设计中所使用的延迟插入法(LIM),提出了新能源电力系统的细粒度建模方法,并结合图形处理器(GPU)的资源优势,实现了算法的并行求解。所提方法将传统交流电网与电力电子设备进行解耦,并基于混合数值稳定性判据和局部截断误差的方法确定了各子系统的步长。然后,通过插值实现了新能源电力系统的多速率仿真。最后,基于GPU硬件平台,以含新能源接入的改进39节点系统为例验证了所提方法的精度,并以不同规模的新能源接入、不同仿真步长的组合验证了所提方法在仿真效率方面的优势。

新型省级电网电磁暂态实时仿真建模方法

为了解决大规模省级电网电磁暂态仿真效率低下的问题,研究了一种适用于省级电网的电磁暂态实时仿真建模方法。分析了大电网电磁暂态建模难点,通过子系统建模和任务优化方法建立了省级电网模型,对各子网内部进行功率调节,实现了首次功率平衡;基于输电线路模型法原理完成了各子网之间输电线接口的联络,在预设平衡点的基础上,通过在线调节潮流的方法使得所建模型运行在合理平衡点上。为验证该方法的有效性,基于自主研发的实时仿真器(universal real-time experimental platform,UREP-300)对某新型省级电网进行实时仿真。仿真结果表明,所提方法能提高仿真效率,扩大了系统的仿真规模,减小了实时仿真机的计算负担,可为各类大规模系统的仿真与建模提供一种参考。

电动拖拉机双电源并联控制研究

电动拖拉机具有结构简单和节能减排等优点,但现有电动拖拉机作业时采用单一动力电池能源,存在续航时间短的问题。为了提高电动拖拉机长续航供电能力,提出了一种基于下垂控制的直流双电源并联均流联合供电方案,利用MatLab/Simulink搭建了系统模型。仿真试验表明:单电源可以实现升压稳压控制;基于下垂控制的双电源并联均流能够实现双电源的电流均流;当切换不同功率负载时,系统电压随功率增加按比例下调,验证了该方案的可行性。

Real-time electromagnetic transient simulation algorithm for integrated power systems based on network level and component level parallelism

The analysis and simulation of power system are becoming more and more challenging as the complexity of system topology and components has been increased. In this paper, a hybrid parallel algorithm is proposed for the real-time electromagnetic transient simulation （EMTS） of integrated power systems containing multiphase machines. The proposed algorithm is com- posed of a novel network partition method called component level parallelization and the Multi-Area Thevenin Equivalent （MATE） method, which extends the flexibility of the network partition in parallel simulation. Moreover, several methods are developed to enhance the efficiency of the communication and computation. Power systems with up to 410 single-phase elec- trical nodes and 336 switches are simulated in a time step of 50 ~ts to validate the proposed algorithm.

电推进粒子模拟中并行化方法研究综述

电推进装置的粒子模拟手段由于其第一性强、物理假设少的特点,可以很好地保留推力器的各种非线性物理过程性质,但计算负担极大,并行计算是一种有效方法计算时间的方法。本文总结了国内外研究现状;分析了粒子算法中并行计算的计算机实现,对并行计算的基础进行了介绍;针对并行计算中的关键技术问题,即粒子部分的并行算法设计、电磁场求解的并行算法设计和计算负载均衡问题进行了概述;最后对电推进装置中并行计算方法进行了总结和展望。

Research on Thermal Management Control Strategy of Electric Vehicle Liquid Cooling Battery Pack

Due to the risk of thermal runaway in the charging and discharging process of a soft packed lithium battery pack for electric vehicles,a stamping channel liquid cooling plate cooling system is designed,and then the heat dissipation problem of the battery pack is solved through reasonable thermal management control strategy.Using computational fluid dynamics simulation software star-CCM+,the thermal management control strategy is optimized through simulation technology,and the temperature field distribution of battery pack is obtained.Finally,an experimental platform is built,combined with experiments,the effectiveness of the thermal management control strategy of the cooling system is verified.The results show that when the battery pack is in the environment of 25℃,the maximum temperature of the cooling system can be lower than 40℃,the maximum temperature difference between all single batteries is within 5℃,and the maximum temperature difference between inlet and outlet coolant is 3℃,which can meet the heat dissipation requirements of the battery pack and prevent out of control heat generation.

一种级联H桥型电力电子变压器电磁暂态解耦与仿真模型

电力电子变压器电磁暂态详细模型存在矩阵维数高、仿真步长小、速度慢的问题。基于半隐式延迟解耦电磁暂态仿真方法,该文将其应用于级联H桥型电力电子变压器的电磁暂态快速仿真研究中,提出一种解耦电路简单、导纳矩阵恒定、易于并行、仿真效率高的解耦和快速仿真方法。该文首先从状态方程出发,利用矩阵分裂和延迟技术,建立双有源桥的半隐式延迟解耦模型;然后给出外端口及级联H桥采用不同串、并联组合时的等值解耦电路,实现了各变换级以及不同模块间的细粒度解耦,给出了计算流程,并分析了方法的特点。最后,通过算例验证了该文方法的准确性和有效性。

基于日电量平衡与日内校验的长期随机运行模拟算法

随着可再生能源接入比例的不断提高,电力系统运行模拟时既需要考虑日内的可再生能源出力波动,还须分析更长时间尺度的可再生能源长期不确定性对系统运行的影响。基于日电量平衡与日内校验框架,提出了考虑多时序场景的电力系统长期随机运行模拟算法。将8760h运行模拟问题转化为日电量平衡运行模拟与日内校验过程两部分。所提算法求解电力系统时序运行模拟问题速度快,精度高,对系统内存占用小,并可以通过并行计算方式缩短求解时间。通过多场景数据进行算例测试,对比了8760h运行模拟与所提算法的求解结果,验证了所提算法的有效性。

基于计算前沿面的实时仿真数值积分并行构造及其数值模型解耦加速方法

数值仿真是先进智能计算的基础与底层核心技术,而计算速度是数值仿真的核心性能指标。然而,随着高开关频率功率器件在电机驱动等系统中的应用,短时间约束给实时及在线数值仿真的计算速度带来了严峻挑战。当前数字平台的计算结构朝着并行化的趋势发展,并行计算被视为短时间约束下优化计算速度的有效途径,但现有的数值模型和数值算法大多基于顺序计算的串行模式,缺乏可并行执行的冗余并行度。因此,该文研究了数值算法的求解核心数值积分的并行优化方法,提出了计算前沿面的优化思路,为数值积分算法构造冗余并行度以实现并行计算,分析了其在数值精度与数值稳定性方面的影响,并讨论了在多步与高阶数值积分法上的可拓展性。同时,利用计算前沿面构造的冗余并行度,设计了数值模型的并行解耦分割,并应用于电驱系统实现了元件级的数值加速。最后,在硬件在环的实时数值环境中验证了优化方法的可行性、数值性能以及加速效果。

Exploration of Artificial-intelligence Oriented Power System Dynamic Simulators

With the rapid development of artificial intelligence(AI),it is foreseeable that the accuracy and efficiency of dynamic analysis for future power system will be greatly improved by the integration of dynamic simulators and AI.To explore the interaction mechanism of power system dynamic simulations and AI,a general design for AI-oriented power system dynamic simulators is proposed,which consists of a high-performance simulator with neural network supportability and flexible external and internal application programming interfaces(APIs).With the support of APIs,simulation-assisted AI and AIassisted simulation form a comprehensive interaction mechanism between power system dynamic simulations and AI.A prototype of this design is implemented and made public based on a highly efficient electromechanical simulator.Tests of this prototype are carried out in four scenarios including sample generation,AI-based stability prediction,data-driven dynamic component modeling,and AI-aided stability control,which prove the validity,flexibility,and efficiency of the design and implementation for AI-oriented power system dynamic simulators.

基于并行计算的氢电耦合直流微电网仿真研究

氢电耦合直流微电网对能源结构调整、可再生能源高效消纳等方面有着重要意义,然而目前此类系统缺乏高精度仿真支撑,不利于相关原型设计快速推进。针对此问题,对氢电耦合直流微电网仿真进行了研究并设计了相应仿真软件。首先,针对氢电耦合直流微电网的多功能需求,提出了基于设备-控制-场景三元素定义的模型库设计方法,采用欧拉算法实现微电网系统暂态仿真。其次,针对不同系统规模与运算平台,采用多核并行计算方法,提出了自适应并行计算最优模式选择算法,提高了仿真效率。基于上述理论分析,形成了基于并行计算的氢电耦合直流微电网仿真验证软件。实验结果表明,该软件可用于氢电耦合直流微电网的仿真验证,提高了较大规模系统的运算效率。

向无源网络供电的VSC–HVDC系统仿真研究

通过分析dq0坐标系下电压源换流器(VSC)模型,获知基于VSC的高压直流输电系统(VSC–HVDC)中有功和无功功率可以分别由d轴电流分量和q轴电流分量独立控制的结论,并基于此设计了定直流电压、定交流电压控制器。在建立VSC–HVDC向无源网络输电的Matlab仿真模型的基础上,对定直流电压、定无功功率、定交流电压等控制方式进行了仿真分析。仿真结果表明,建立的VSC–HVDC系统能较好地向无源网络供电,且控制方式灵活、简便,在传输有功功率的同时VSC还可以吞吐无功功率。

三相四线制电力有源滤波器的滑模变结构控制

设计了一种基于滑模变结构控制的三相四线制有源滤波器装置,介绍了该装置的原理及滑模变结构控制方法,并对滑动模态的存在性、可达性和稳定性进行了分析;指出滑模控制的本质是一种等速趋近律,并对其优缺点进行了分析,仿真结果表明该控制方法具有良好的谐波抑制性能,且易于实现。

单相自适应重合闸相位判据的研究

自适应自动重合闸技术具有诸多传统重合闸技术所不具有的优势。提出了一种新型区分输电线路单相瞬时性故障与永久性故障的方法。当瞬时性故障发生时 ,短路点电弧熄灭后 ,在恢复电压阶段 ,断开相电压的大小及其相位都与永久性故障情况有本质不同。在详细分析断开相电压工频分量组成部分的基础上 ,利用它们的相位特性 ,提出了单相自适应重合闸的相位判据 ,并针对输电线路的实际参数、运行方式以及故障条件对判据的影响做了详尽分析 ,结果表明 ,相位判据可以准确判定故障性质。该判据方法简单、可靠 ,而且仅利用单端电气量 ,易于实现。

利用配电网静止无功补偿器改善配电网电能质量的方法

随着社会的发展,用户对电能质量的要求越来越高。能快速响应的配电网静止无功补偿器(DSTATCOM)是改善配电网系统电能质量的一种有效方法。文章提出了一种新的平衡不对称负荷的方法,并通过仿真和实验证明了DSTATCOM 抑制电压跌落、电压波动及平衡三相不平衡负荷的有效性和可行性。

基于Ward等值的二级电压控制研究

随着电网联系的日趋紧密,电压控制区间的耦合程度也日益密切,往往使常规的分区电压控制策略很难实施。文章基于Ward等值考虑了相邻电压控制区间的无功影响,对现有的分区电压控制策略进行了改进,并以新英格兰系统为例进行了数字仿真,证明了采用新的控制方案后,相邻电压控制区的无功电压变化对本区域电压控制性能的影响明显减弱,从而验证了改进的电压控制方案的有效性。

电力系统故障时继电保护装置动态特性的数字仿真

提出了用计算机软件模拟任何继电保护装置的具体结构并用故障数据进行故障期间继电保护动态特性仿真的原理 ,该软件将主要用于保护误动或拒动后的事故分析 ,与电力系统动态模拟或其他故障再现设备相比具有成本低、灵活性好、省时的优点。该仿真软件可用来详细检查事故中微机保护内部的程序走向或各种常规保护中各元件的时间、逻辑配合关系 。