Method and apparatus for security constrained economic dispatch in hybrid power systems

    公开(公告)号:US09705336B2

    公开(公告)日:2017-07-11

    申请号:US14080523

    申请日:2013-11-14

    CPC classification number: H02J4/00 G06Q10/063 G06Q50/06 H02J2003/007

    Abstract: The teachings herein disclose an advantageous method and apparatus for performing Security Constrained Economic Dispatch (SCED) for a hybrid power system that includes one or more AC grids interconnected with one or more multi-terminal High Voltage DC (HVDC) grids. The teachings include optimizing a non-linear objective function, subject to a set of constraints that include AC and DC grid constraints, for determining the SCED solution using successive linear approximation. The linear programming model used in the linear approximations is advantageously augmented with a DC grid portion in a manner that accounts for the effects of the DC grid on the AC grid, but which does not require exposing proprietary DC grid modeling details, and which conforms the resultant SCED solution to all applicable AC and DC grid constraints, including AC grid line flow constraints, AC grid power balance constraints, DC grid line flow constraints, and DC grid power balance constraints.

    Energy storage systems
    14.
    发明授权

    公开(公告)号:US09705332B2

    公开(公告)日:2017-07-11

    申请号:US13413174

    申请日:2012-03-06

    CPC classification number: H02J3/32 Y10T307/549

    Abstract: A method for controlling an energy storage system for connection to a power system, and such an energy storage system are provided. The method makes use of a model based predictive controller to optimize the charging/discharging rates of energy storage elements in a hybrid energy storage system. The method includes determining respective desired charging/discharging rates for the energy storage elements in dependence upon state of charge predictions from respective models of the storage elements, using model predictive control, and adjusting respective charging/discharging rates of the storage elements in accordance with the determined rates. The energy system includes a controller configured to control respective charging/discharging rates of the energy storage elements in accordance with the method.

    Power distribution system loss reduction with distributed energy resource control
    16.
    发明授权
    Power distribution system loss reduction with distributed energy resource control 有权
    配电系统损耗减少与分布式能源资源控制

    公开(公告)号:US09590423B2

    公开(公告)日:2017-03-07

    申请号:US13600357

    申请日:2012-08-31

    CPC classification number: H02J3/18 Y02E40/30

    Abstract: A power distribution system has a plurality of reactive power resources including capacitor banks and distributed energy resources connected to branches of the power distribution system. Power loss is reduced in the distribution system by determining discrete switch states for the capacitor banks and continuous set points for the distributed energy resources, so that the reactive power provided by the reactive power resources reduces power loss while optionally correcting voltage violations in the power distribution system when the capacitor banks are set in accordance with the respective discrete switch states and the distributed energy resources are operated at the respective continuous set points. The range of values for the continuous set points is constrained based on maximum and minimum reactive power limits for each distributed energy resource under consideration.

    Abstract translation: 配电系统具有多个无功功率资源,包括电容器组和连接到配电系统的分支的分布式能源。 通过确定分布式能源的电容器组和连续设定点的离散开关状态,分配系统中的功率损耗减小,使得由无功功率资源提供的无功功率降低功率损耗,同时可选地校正功率分配中的电压违规 系统,当电容器组根据相应的离散开关状态设置并且分布式能量资源在相应的连续设定点运行时。 基于所考虑的每个分布式能源的最大和最小无功功率限制,连续设定点的值的范围受到限制。

    Fast power swing unblocking method and apparatus for distance protection in power system
    17.
    发明授权
    Fast power swing unblocking method and apparatus for distance protection in power system 有权
    电力系统远距离保护功能快速切换方法及装置

    公开(公告)号:US09496706B2

    公开(公告)日:2016-11-15

    申请号:US13002701

    申请日:2008-07-07

    CPC classification number: H02H3/40 G01R31/085 G01R31/088

    Abstract: The present invention discloses a fast power swing unblocking method and apparatus for a distance protection in a power system, which is able to ensure fast phase-segregated tripping of distance protection for faults during a power swing (3-phase or 2-phase swing). The power swing unblocking method in a power system according to the present invention comprises calculating changing rates of impedances for all operating loops of the distance protection in the power system; and determining a fault loop based on the calculated changing rates. If there is a fault loop, a blocked distance zone for the fault loop is unblocked. Before calculating the changing rates, whether the power system is under a power swing is checked and a distance zone that might mal-operate under the power swing is blocked if it is checked that the power system is under the power swing. By applying this invention, the performance of the distance protection during power swings can be improved, and the distance protection can ensure faster and phase-segregated operation, which are very beneficial for the system reliability.

    Abstract translation: 本发明公开了一种用于电力系统中的距离保护的快速功率摆幅解锁方法和装置,其能够确保在功率摆动(3相或2相摆动)期间对于故障的距离保护的快速相位偏移脱扣, 。 根据本发明的电力系统中的功率摆动解锁方法包括计算电力系统中距离保护的所有操作回路的阻抗变化率; 以及基于所计算的变化率来确定故障循环。 如果存在故障循环,故障循环的阻塞距离区域将被解除阻塞。 在计算变化率之前,检查电力系统是否处于功率摆动状态,如果检查到电力系统处于功率摆动状态,则在功率摆动下可能会运行故障的距离区域被阻止。 通过应用本发明,可以提高功率摆动期间的距离保护性能,并且距离保护可以确保更快和相位分离的操作,这对系统的可靠性是非常有益的。

    Modified voltage source converter structure
    18.
    发明授权
    Modified voltage source converter structure 有权
    修改电压源转换器结构

    公开(公告)号:US09484835B2

    公开(公告)日:2016-11-01

    申请号:US13500258

    申请日:2009-10-06

    Applicant: Staffan Norrga

    Inventor: Staffan Norrga

    CPC classification number: H02M7/483 H02M1/12 H02M1/14 H02M2007/4835

    Abstract: The invention concerns a voltage source converter (26) comprising a group of phase legs, at least three connection terminals (AC1, AC2, AC3, DC+, DC−) for connecting the phase legs to power transmission elements, a first group of cells (C1p1, C2p1, C1n1, C2n1, C1p2, C2p2, C1n2, C2n2, C1p3, C2p3, C1n3, C2n3) in each phase leg and a second group of cells (C3p1, C3n1, C3p2, C3n2 C3p3, C3n3). The cells (C1p1, C2p1, C1n1, C2n1, C1p2, C2p2, C1n2, C2n2, C1p3, C2p3, C1n3, C2n3) in the first group are only capable of providing unipolar voltage contributions to the converter and connected for only being capable of such unipolar voltage contributions, while the cells (C3p1, C3n1, C3p2, C3n2 C3p3, C3n3) in the second group are connected to the corresponding cells of the first group and arranged to have bipolar voltage contribution capability.

    Abstract translation: 本发明涉及一种电压源转换器(26),包括一组相位支路,至少三个连接端子(AC1,AC2,AC3,DC +,DC-),用于将相位支路连接到功率传输元件,第一组单元( C1p1,C2p1,C1n1,C2n1,C1p2,C2p2,C1n2,C2n2,C1p3,C2p3,C1n3,C2n3)和第二组细胞(C3p1,C3n1,C3p2,C3n2 C3p3,C3n3)。 第一组中的单元(C1p1,C2p1,C1n1,C2n1,C1p2,C2p2,C1n2,C2n2,C1p3,C2p3,C1n3,C2n3)仅能够向转换器提供单极电压贡献,并且仅能够连接 单极电压贡献,而第二组中的电池(C3p1,C3n1,C3p2,C3n2 C3p3,C3n3)连接到第一组的相应电池,并布置成具有双极电压贡献能力。

    Energy efficient method for communication in a wireless sensor network of an industrial control system
    19.
    发明授权
    Energy efficient method for communication in a wireless sensor network of an industrial control system 有权
    在工业控制系统的无线传感器网络中进行通信的节能方法

    公开(公告)号:US09451498B2

    公开(公告)日:2016-09-20

    申请号:US13618962

    申请日:2012-09-14

    Abstract: A method for communication in a wireless sensor network of an industrial control system. The network includes a plurality of device nodes and at least one gateway. The method includes aggregating in at least one wireless device data originating from at least two data packets. The method includes receiving at a first node at least one first data packet for a first destination address and aggregating data from the at least one data packet with data from at least one second data packet, intended for the same first destination address, forming an aggregated data packet and sending the aggregated data packet to another node or to said gateway. In other aspects of the invention a method, system and a computer program for carrying out the method are described.

    Abstract translation: 一种用于工业控制系统的无线传感器网络中的通信的方法。 网络包括多个设备节点和至少一个网关。 该方法包括在至少一个无线设备中聚合源自至少两个数据分组的数据。 所述方法包括在第一节点处接收用于第一目的地地址的至少一个第一数据分组,并且将来自所述至少一个数据分组的数据与来自用于相同第一目的地地址的至少一个第二数据分组的数据聚合,形成聚合 数据分组,并将聚合的数据分组发送到另一节点或所述网关。 在本发明的其他方面,描述了用于执行该方法的方法,系统和计算机程序。

    Converter station power set point analysis system and method
    20.
    发明授权
    Converter station power set point analysis system and method 有权
    变电站功率设定点分析系统及方法

    公开(公告)号:US09450409B2

    公开(公告)日:2016-09-20

    申请号:US13922644

    申请日:2013-06-20

    CPC classification number: H02J3/14 G06F1/3203 H02J3/34 H02J3/36 H02J3/38 Y02E60/60

    Abstract: Converter stations have real and reactive power set points initially determined as part of a main loadflow analysis routinely performed on the AC power system connected to the converter stations. Viable real and/or reactive power set points for the converter stations can be identified by calculating real and/or reactive power set point candidates for the converter stations before the main loadflow analysis is performed again on the AC power system. The power set point candidates are calculated based on information determined as part of a previous iteration of the main loadflow analysis on the AC power system. The power set point candidates which violate an operating constraint imposed on the AC power system are identified, and a region of valid power set points is defined for the converter stations that excludes the power set point candidates which violate an operating constraint imposed on the AC power system.

    Abstract translation: 转换器站具有最初确定为在连接到转换器站的AC电力系统上常规执行的主要负载流分析的一部分的实际和无功功率设定点。 可以通过在AC电力系统再次执行主负载流分析之前计算转换器站的实际和/或无功功率设定点候选来识别转换站的可行的实际和/或无功功率设定点。 功率设定点候选是基于作为交流电力系统主负载流分析的先前迭代的一部分确定的信息来计算的。 识别违反施加在交流电力系统上的操作约束的功率设定点候选,并且为排除违反施加于交流电源的操作约束的功率设定点候选的转换器站定义有效功率设定点的区域 系统。

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