提出一种IEC 61850 GOOSE服务映射到低功耗蓝牙4.0的方法,介绍了蓝牙4.0的协议栈和低功耗原理以及GOOSE服务的协议栈;给出了GOOSE通信A协议子集和T协议子集的服务和协议,以及协议数据单元的表示层的编码规则。以一种无线温度传感器为例,给出了该传感器的IED模型及ASN.1的协议数据单元帧结构示例和低功耗蓝牙4.0的GOOSE报文帧格式,可应用于电力无线传感器的开发和工程实施。
For a combined cooling heating and power( CCHP) system which mainly consists of internal combustion engine and absorption chiller-heater,an economic operation optimization model used for the grid-connected operation mode without power injection is proposed in this paper. The coordination problem between the CCHP and the electric air conditioners is considered in the model. The minimal operation cost of the system meeting the load demand of cooling,heating and power is taken as the optimizing function. The constraints are established based on the analysis of the thermoelectric property of relevant equipment and the corresponding characteristic functions. The path tracking interior point method is used to solve the optimization problem to obtain the optimal operation scheme of the CCHP system. In the case study,a building in Guizhou province was selected as the research subject. According to the load forecasting data of cooling,heating and power of typical months of the building,the proposed optimization method based on the interior point method was applied to gain the generation schemes of the internal combustion engine and operation programs of the electric air conditioners. The results verify the feasibility of the proposed optimization method for economic operation of the CCHP system.
In view of the defects of applying LCL filters in voltage source PWM rectifier( VSR),such as resonance and system instability,this paper presents a novel multi-loop control strategy and designs the control structure in synchronous coordinate system. The strategy belongs to active damping control,which introduces the filter capacitor current-loop feedback control on the basis of the traditional double-loop control system. The strategy increases the system equivalent damp which effectively inhibits the LCL filter resonance,thus ensures the system stability. The proposed strategy system has been simulated by using Matlab /Simulink,and the results verify its feasibility and effectiveness.
The participation of pumped storage power station in the power system operation can effectively improve the wind powe access to power grid.The unit commitment model is constructed from the perspective of system;the system optimal dispatching strategy is researched by combining the operation optimization of wind power and pumped storage power station with the conventional unit commitment.Through the example analysis of a 10-unit system,the optimal dispatching strategy is formulated for conventional thermal units,and wind power and pumped storage power station.Comparative analysis is made on the effects of pumpe storage station on improving the system operation economy and the wind powe access.
The previous blackout accident analysis reveals that large-scale blackout was eventually triggered when the local adjusting failure in the event of the source fault led to cascading failure and the subsequent grid operation environment deterioration. Based on CCA( cause consequence analysis) method and the basic features of power grid topology and control equipments,the causes of the grid cascading failure and the possible consequences after the control failure are analyzed,and the dynamic transfer process of power grid failure is elaborated. The case study of the largescale blackout occurred in South America and North Mexico interconnected power grid in 2011,verifies the applicability of this proposed method,providing reference for blackout accident analysis.
Supply and transportation management of key power materials plays an important role in power supply chain and intensive material management. In the link of key material transportation,most of the materials are sent straightly to the field by suppliers. In this process,the traditional vehicle GPS devices are used to monitor vehicle operation, involving complex installation and debugging,and lack of transportation quality monitoring means( such as turbulence and overthrow). Shanghai Municipal Electric Power Company analyzes the supervision and control requirements for key material transportation path. Then in combination with the the Internet of things technology,the portable transportation monitoring equipment is designed and applied,in order to realize the key material transportation path and quality monitoring and improve the quality of power supply security ability and whole process control level.
This paper established the mathematical models for wind turbine,photovoltaic cell( PV) and storage battery,and formulated the optimal dispatch strategy considering protection of battery charging and discharging. PSO algorithm with restrictions for full battery charge and discharge was adopted to solve the optimal dispatch model and minimize system operation cost. The day-ahead optimal dispatch was applied to the actually operating microgrid composed of wind,PV and battery,and the generation schedule was made for every unit. The simulation results have verified the efficiency of the proposed algorithm and strategy.
The grid-connected interface device for distributed PV power has been developed in this research. This device is installed in the common coupling switch connecting distributed PV plant to the grid,and has multiple functions,including distributed PV power protection,measurement and control,power quality monitoring,operation control,communication management,remote control,information security encryption and so on. Thereby,the faults can be isolated within distributed PV plant; a variety of communication means can be connected to PV inverter,combiner box,environmental monitor,electric meter,etc. Thus,real-time feedback of power plant information can be acquired from SCADA control center; the remote control can be achieved over the common coupling switching and inverter starting and stopping,realizing the dispatching center's real-time monitroing of the distributed PV system.
定位电能质量干扰源是确定电力系统中电能质量污染责任并深化治理的前提.提出一种利用已有的海量电能质量监测数据,基于关联分析算法确定各监测节点在电压事件上的相互影响关系,进而定位干扰源的方法.在技术路线上,重点实现了对采自实际电网的电能质量监测数据的转换处理,使顺序存储的数据转为多节点按时间轴对齐的二维表,之后选用PF-growth算法,采用合适的参数,计算出各节点之间在电压事件上的影响关系.相对于传统的系统仿真和矩阵计算的方法,本文方法具有成本低、计算快速有效等特点.
电力网络的智能报警与故障诊断过程主要依靠继电保护装置动作报警,但是,保护装置可能存在的误动将导致错误的诊断结果.随着数字变电站的发展和IEC61850的应用,变电站综合自动化系统中的二次回路信号越发显现出可用价值,这些信号中可能隐含的保护警报间的控制或闭锁关系,可以用来有效排除智能报警功能中的误动警报.本文主要讨论如何将二次回路信号整合到电力网络诊断的过程之中,研究了诊断过程中可能用到的信号,在IEC61850的基础上提出了一种二次回路信号的建模方法和一种考虑二次回路信号的诊断方法,并利用算例说明了该方法的实用性.
气化炉是整体煤气化联合循环发电技术(IGCC)中关键的部分,其运行性能直接影响到整个IGCC的发电效率.因此,必须对气化炉进行有效的控制.ALSTOM气化炉具有强的非线性及大惯性,常规的控制方法难以满足运行条件下的各项控制指标.通过分析ALSTOM气化炉基准控制问题,将一阶线性自抗扰控制应用于该系统中,设计了两种控制方案.通过测试表明在满足各种约束条件的前提下,其控制性能指标均达到了基准测试所提出的各项要求,且实时解耦能力明显,结构简单,优于传统控制器.
针对传统的电网调度员仿真培训系统与监控仿真培训系统单独运行的缺陷,提出了一种在统一数据平台下的联合仿真培训方法,基于该方法开发了仿真培训系统,介绍了该系统的设计思路与实现的功能.提出基于二次设备原子概念的监控二次信号仿真方法,降低了建模的工作量,并实现海量监控信号的快速建模.该系统已在某省调控一体化仿真培训中得以应用.
当电网发生故障时,变电站会产生大量的报警和录波数据.这其中包括二次回路信号、故障录波数据和PMU数据.故障录波数据包含故障发生发展的细节信息,可以用于诊断故障发生时间、断路器动作时间.这对电网诊断和智能报警功能非常重要.然而,一般用故障录波数据进行诊断分析需要调度人员的参与,耗时很长.本文面向IEC 61850和数字化变电站设计一种两层的故障诊断模式.基于此,提出一种检测反映故障过程中的主要事件的录波数据突变检测的混合算法,这些主要事件包括故障发生、断路器动作等.使用仿真算例验证了所提方法的正确性和有效性.
分级调度模式下网省协调控制效果与整个电网的电压稳定性紧密相关.网省协调中协调关口可增减无功影响到实时控制效果,它可以划分为两个子问题,第一个是如何确定协调关口,形成协调区域,第二个是如何计算关口可增减无功.对于第一个问题,为了解决“大环带小环”运行模式下存在的协调区域难以划分,受电网运行方式大的难题,采用基于拓扑搜索自动形成协调区域;对于第二个问题,采用基于灵敏度的手段实时计算协调关口可增减无功,并引入了协调区内分组实现降维处理,从而保证了策略工程化应用的可行性.通过实际案例对本方法进行验证,结果表明该方法具有一定的实用价值.
通过燃煤堆放试验及混煤掺烧试验,将特性互补的褐煤和优混煤在炉前进行混合后在炉内进行掺烧,通过对混合煤种特性的分析及混合煤种掺烧中经济性及环保排放进行综合评价,确认了混煤掺烧技术的可行性,为褐煤的掺烧提供了新的思路.同时,通过对混煤掺烧的优缺点进行分析,也为混煤掺烧技术的推广和应用提供了参考.
为了提高储能系统运行的稳定性、高效控制以及设备间的互操作性,遵照IEC 61850标准,在分析储能监控系统功能及信息量基础上,建立了储能监控系统逻辑设备、逻辑节点、数据信息模型.通过在国家风光储输示范工程一期中的应用表明,该研究可提高储能监控系统不同厂商设备的互操作性及储能系统的安全管理水平.
继电保护通道的安全性历来是电力通信专网保障的重中之重,如何避免因光缆中断造成继电保护信号无法正常传输,以至被迫停电的风险,对保障电网的安全稳定运行具有重要的意义.不同电压等级的线路对继电保护通道的传输要求也各不相同,针对华东地区500 kV线路,结合目前继电保护通道的现状及问题,对提出的三个技术方案进行了分析.在技术层面上探讨了如何通过增加路由的方式来提高保护通道运行的可靠性.
针对火电厂现场数据容易受到各种噪声干扰的问题,提出了一种二级串联自适应噪声消除器,将ANC系统与ALE系统串联起来联合消噪,提高了信号精度.对于多个传感器的数据融合问题,结合一种分布式融合结构模型,并采用一种权值最优分配准则作为融合中心算法,改善了数据处理方式,提高了数据可用性.最后,基于一种热量信号构造模型的实际数据仿真进行仿真,得到的计算热量信号数据波动较小,稳态效果更好,去噪效果明显.
由于受风速等自然因素影响,导致并网的风电场有功功率波动,严重影响电网的电能质量,给系统的稳定运行带来严峻挑战.为了减小风电场出力波动,提出在永磁直驱(PMSG)风电场PCC点加入直接功率控制的钒液流电池(VRB)储能系统的新拓扑结构来平抑风电场出力波动的方案.通过对比分析加储能系统前后风电场故障特性,提出含储能系统的风电场联络线自适应距离保护方案.最后仿真验证了提出方案的有效性和可行性.
为了深入研究谐振接地系统的运行特点,检验消弧线圈控制装置的各项性能指标,提出了一种低压模拟环境的研究思路和实现方法,详细介绍了低压试验环境的技术参数和主要部件的实现方法.利用低压模拟环境可以对消弧线圈控制装置进行各项功能性试验,包括系统电容电流测量试验、自动调谐试验、自动跟踪试验及单项接地等多项试验,对谐振接地系统的研究应用具有指导意义.
