公开(公告)号：US09625929B2

公开(公告)日：2017-04-18

申请号：US14292022

申请日：2014-05-30

Applicant: Tsinghua University ,  Guizhou Power Grid Information & Telecommunication Co., Ltd.

Inventor： Wenchuan Wu ,  Boming Zhang ,  Qing Zou ,  Hongbin Sun ,  Fei Li ,  Qinglai Guo ,  Yi Liu ,  Yajing Gao ,  Hongjia Miao ,  Yuan Ji

IPC: G06F7/32 ,  G05F1/66 ,  G01R19/25 ,  G01R27/02 ,  G01R31/02

CPC classification number: G05F1/66 ,  G01R19/2513 ,  G01R27/02 ,  G01R31/027

Abstract: A method for obtaining a three-phase power flow of a power distribution network and a device for obtaining a three-phase power flow of a power distribution network are provided. The method includes steps of: selecting a three-phase power transformer in the power distribution network and configuring a secondary side of the three-phase power transformer with an ungrounded neutral connection, such that the three-phase power transformer satisfies a preset voltage-current relationship; adding a constraint condition to the preset voltage-current relationship to correct a three-phase admittance matrix of the three-phase power transformer; and applying the three-phase admittance matrix to a preset algorithm to obtain a three-phase power flow of the power distribution network.

公开(公告)号：US20170024324A1

公开(公告)日：2017-01-26

申请号：US14980346

申请日：2015-12-28

Applicant: TSINGHUA UNIVERSITY

Inventor： Jiwu Shu ,  Youyou Lu ,  Fei Li

IPC: G06F12/10 ,  G06F3/06

CPC classification number: G06F12/1009 ,  G06F3/0604 ,  G06F3/0631 ,  G06F3/064 ,  G06F3/0679 ,  G06F9/467 ,  G06F11/00 ,  G06F12/0246 ,  G06F2212/1016 ,  G06F2212/7201 ,  G06F2212/7207

Abstract: The present invention discloses a method for distributed transaction processing in a flash memory, including the following steps: S1. performing two-phase commit on a transaction, removing a state log record of a two-phase commit protocol, and internalizing as an operation on flash memory metadata in a transaction interface; S2. storing a temporary data object as a shadow version while performing the transaction, using a shadow mapping table to store the address of the shadow version or a state of a page, using page metadata to record transaction information, using a transaction metadata page to record a transaction state, and using a transaction state table to record an address of the transaction metadata page; and S3. when the coordinator or a participant fails, recovering the FTL mapping table, shadow mapping table, and transaction state table with the help of stored data and flash memory metadata. The present invention has the following advantages: the number of logs is reduced, and performance of transaction processing in a distributed flash memory environment is improved.

Abstract translation: 本发明公开了一种闪存中分布式事务处理的方法，包括以下步骤：S1。 对事务执行两阶段提交，删除两阶段提交协议的状态日志记录，并将其作为对事务接口中闪存元数据的操作进行内部化; S2。 在执行事务时将临时数据对象存储为阴影版本，使用阴影映射表来存储阴影版本的地址或页面的状态，使用页面元数据来记录事务信息，使用事务元数据页来记录 交易状态，并使用事务状态表来记录事务元数据页面的地址; 和S3。 当协调者或参与者失败时，借助存储的数据和闪存元数据恢复FTL映射表，阴影映射表和事务状态表。 本发明具有以下优点：减少了日志数量，提高了分布式闪存环境中的事务处理性能。

公开(公告)号：US10191851B2

公开(公告)日：2019-01-29

申请号：US14980346

申请日：2015-12-28

Applicant: TSINGHUA UNIVERSITY

Inventor： Jiwu Shu ,  Youyou Lu ,  Fei Li

IPC: G06F12/00 ,  G06F12/1009 ,  G06F3/06

Abstract: The present invention discloses a method for distributed transaction processing in a flash memory, including the following steps: S1. performing two-phase commit on a transaction, removing a state log record of a two-phase commit protocol, and internalizing as an operation on flash memory metadata in a transaction interface; S2. storing a temporary data object as a shadow version while performing the transaction, using a shadow mapping table to store the address of the shadow version or a state of a page, using page metadata to record transaction information, using a transaction metadata page to record a transaction state, and using a transaction state table to record an address of the transaction metadata page; and S3. when the coordinator or a participant fails, recovering the FTL mapping table, shadow mapping table, and transaction state table with the help of stored data and flash memory metadata. The present invention has the following advantages: the number of logs is reduced, and performance of transaction processing in a distributed flash memory environment is improved.

公开(公告)号：US20150199301A1

公开(公告)日：2015-07-16

申请号：US14292022

申请日：2014-05-30

Applicant: Tsinghua University ,  Guizhou Power Grid Information & Telecommunication Co., Ltd.

Inventor： Wenchuan Wu ,  Boming Zhang ,  Qing Zou ,  Hongbin Sun ,  Fei Li ,  Qinglai Guo ,  Yi Liu ,  Yajing Gao ,  Hongjia Miao ,  Yuan Ji

IPC: G06F17/16 ,  G05F1/66

CPC classification number: G05F1/66 ,  G01R19/2513 ,  G01R27/02 ,  G01R31/027

Abstract: A method for obtaining a three-phase power flow of a power distribution network and a device for obtaining a three-phase power flow of a power distribution network are provided. The method comprises steps of: selecting a three-phase power transformer with an ungrounded neutral connection in the power distribution network; correcting a three-phase admittance matrix of the three-phase power transformer; and applying the three-phase admittance matrix to a preset algorithm to obtain a three-phase power flow of the power distribution network.

Abstract translation: 提供一种用于获得配电网络的三相电力流的方法和用于获得配电网络的三相电力流的装置。 该方法包括以下步骤：在配电网中选择具有不接地中性点连接的三相电力变压器; 校正三相电力变压器的三相导纳矩阵; 并将三相导纳矩阵应用于预设算法，以获得配电网络的三相功率流。