公开(公告)号：EP3163706A1

公开(公告)日：2017-05-03

申请号：EP15814491

申请日：2015-05-11

申请人： HITACHI LTD

发明人： KURODA EISUKE ,  SATO YASUO ,  TOMOBE OSAMU ,  YAMAZAKI JUN ,  YATSU MASAHIRO ,  MIYOSHI HARUKI

IPC分类号： H02J3/00 ,  H02J3/16 ,  H02J13/00

CPC分类号： G01R19/2503 ,  H02J3/06 ,  H02J3/16 ,  H02J3/382 ,  H02J3/383 ,  H02J3/386 ,  H02J13/0006

摘要： The present invention addresses the conventional problem of not assuming the time-series output change of a renewable energy and therefore possibly taking an inadequate voltage stability improvement countermeasure. According to the present invention, a voltage stability monitoring device (10) for monitoring the voltage stability of a system is characterized by comprising: an assumed change scenario calculation unit (31) for predicting the output variation of a renewable energy connected to said system and calculating an assumed change time-series power flow state on the basis of said output variation; a time-series voltage stability calculation unit (32) for calculating a node voltage change with respect to demand at each node of said system on the basis of said power flow state calculated by said assumed change scenario calculation unit and calculating a voltage stability indicating the relationship curve between said node voltage and reactive power; and a voltage stability improvement countermeasure search unit (34) for determining a controlled device on which an assumed control is to be performed, according to said voltage stability calculated by said time-series voltage stability calculation unit.

摘要翻译： 本发明解决了不假定可再生能源的时间序列输出变化并因此可能采取不适当的电压稳定性改进对策的传统问题。 根据本发明，用于监视系统的电压稳定性的电压稳定性监视装置（10）的特征在于包括：用于预测连接到所述系统的可再生能源的输出变化的假设变化情景计算单元（31），以及 基于所述输出变化来计算假设的变化时间序列潮流状态; 时间序列电压稳定性计算单元（32），用于基于由所述假设改变情景计算单元计算的所述电力电流状态计算相对于所述系统的每个节点处的需求的节点电压改变，并且计算表示 所述节点电压与无功功率之间的关系曲线; 以及电压稳定性改善对策检索部（34），根据由所述时间序列电压稳定性计算部计算出的所述电压稳定度，判定进行假定控制的被控制设备。

公开(公告)号：EP3200316A4

公开(公告)日：2018-05-02

申请号：EP15844954

申请日：2015-05-28

申请人： HITACHI LTD

发明人： YAMAZAKI JUN ,  YATSU MASAHIRO ,  TOBE SUMITO ,  TOMOBE OSAMU ,  INUDUKA TATSUKI

IPC分类号： H02J13/00 ,  H02J3/38

CPC分类号： G01B7/14 ,  G01R27/16 ,  G01R31/40 ,  H02J3/381 ,  H02J3/383 ,  H02J3/386 ,  H02J3/46 ,  H02J13/002 ,  H02J13/0079

摘要： The present invention monitors an electric power system using a time-series measurement value including abnormality. An electric power system monitoring device is provided with: a storage unit that stores facility information indicating a position relationship of a plurality of measurement sites in an electric power system; a reception unit that receives time-series measurement information measured by a measurement device disposed at each of the plurality of measurement sites; and a computation unit that acquires an electrical distance between the plurality of measurement sites on the basis of the facility information, classifies the plurality of measurement sites into at least one measurement site group on the basis of the electrical distance, extracts, with respect to each of the measurement sites in the measurement site group, a frequency component of electric power fluctuation from the measurement information, selects, with respect to a first frequency component which is a frequency component of a first measurement site in the measurement site group, a second frequency component which is a frequency component of a second measurement site in the measurement site group, and calculates a similarity between the first frequency component and the second frequency component.

公开(公告)号：EP3163706A4

公开(公告)日：2018-02-28

申请号：EP15814491

申请日：2015-05-11

申请人： HITACHI LTD

发明人： KURODA EISUKE ,  SATO YASUO ,  TOMOBE OSAMU ,  YAMAZAKI JUN ,  YATSU MASAHIRO ,  MIYOSHI HARUKI

IPC分类号： H02J3/06 ,  H02J3/16 ,  H02J3/38 ,  H02J13/00

CPC分类号： G01R19/2503 ,  H02J3/06 ,  H02J3/16 ,  H02J3/382 ,  H02J3/383 ,  H02J3/386 ,  H02J13/0006

摘要： The present invention addresses the conventional problem of not assuming the time-series output change of a renewable energy and therefore possibly taking an inadequate voltage stability improvement countermeasure. According to the present invention, a voltage stability monitoring device (10) for monitoring the voltage stability of a system is characterized by comprising: an assumed change scenario calculation unit (31) for predicting the output variation of a renewable energy connected to said system and calculating an assumed change time-series power flow state on the basis of said output variation; a time-series voltage stability calculation unit (32) for calculating a node voltage change with respect to demand at each node of said system on the basis of said power flow state calculated by said assumed change scenario calculation unit and calculating a voltage stability indicating the relationship curve between said node voltage and reactive power; and a voltage stability improvement countermeasure search unit (34) for determining a controlled device on which an assumed control is to be performed, according to said voltage stability calculated by said time-series voltage stability calculation unit.

公开(公告)号：EP3136530A4

公开(公告)日：2018-01-17

申请号：EP15783447

申请日：2015-04-06

申请人： HITACHI LTD

发明人： KURODA EISUKE ,  SATO YASUO ,  TOMOBE OSAMU ,  YAMAZAKI JUN ,  YATSU MASAHIRO ,  HARA KOUICHI ,  MIYOSHI HARUKI

IPC分类号： H02J3/00 ,  H02J3/24 ,  H02J13/00

CPC分类号： G01R19/2513 ,  G01R19/0084 ,  H02J3/00 ,  H02J3/24 ,  H02J13/00

摘要： An object is to accurately monitor deterioration of current or future voltage stability, by dynamically changing a bus in which current or future voltage stability deteriorates, in stability monitoring calculation of a power system. Hence the present invention provides a voltage stability monitoring device, which monitors voltage stability of a power system, including an assumed change scenario calculation unit which produces a plurality of assumed change scenarios indicating a scenario of a change that is assumed based on at least one of a system configuration of the power system and a change of a tide state; a voltage stability calculation unit which calculates the voltage stability using the assumed change scenario; a voltage stability margin calculation unit which calculates a voltage stability margin indicating margin degree of the voltage stability, based on the voltage stability; an each scenario severity ranking calculation unit which selects an assumed change scenario with high severity of the voltage stability for each assumed change scenario, based on the voltage stability margin; a vulnerable bus calculation unit which calculates which of buses in the power system is a vulnerable bus that decreases voltage stability, based on the assumed change scenario which is selected; and a monitoring location change unit which changes a monitoring target of the voltage stability, based on information of the vulnerable bus.