公开(公告)号：US20180052434A1

公开(公告)日：2018-02-22

申请号：US15679640

申请日：2017-08-17

Applicant: DENSO WAVE INCORPORATED

Inventor： Takaaki MAEKAWA

IPC: G05B19/042 ,  G11C7/10 ,  G06F13/12 ,  H02J9/06 ,  H02J3/08 ,  G06F13/16 ,  G06F13/14

CPC classification number: G05B19/0423 ,  G06F11/00 ,  G06F13/126 ,  G06F13/14 ,  G06F13/1689 ,  G11C7/1045 ,  H02J3/08 ,  H02J9/061

Abstract: In an I/O module, a communication enables communications between first and second external devices upon a voltage being supplied from a power source thereto. A shutoff switch shuts off supply of the voltage to the communication controller when turned off. A capacitor is charged based on the voltage supplied from the voltage source while the shutoff switch is in an on state. The capacitor supplies an operating voltage to the communication controller while the shutoff switch is turned off. The communication controller detects a voltage across the capacitor as a diagnostic voltage, and outputs a turn-off command to the shutoff switch for turning off the shutoff switch. The communication controller determines whether there is a fixedly closed malfunction in the shutoff switch based on the diagnostic voltage while outputting the turn-off command to the shutoff switch.

公开(公告)号：US09882424B2

公开(公告)日：2018-01-30

申请号：US14186159

申请日：2014-02-21

Applicant: General Electric Company

Inventor： Yashomani Kolhatkar ,  Pradeep Vijayan ,  Silvio Colombi ,  Rajendra Naik ,  Viswanathan Kanakasabai

IPC: H02J9/06 ,  H02M5/42

CPC classification number: H02J9/062 ,  G06F1/26 ,  G06F1/30 ,  H02J3/08 ,  H02J2009/068 ,  H02M5/42 ,  Y10T307/344

Abstract: A system is provided. The system includes a plurality of uninterruptible power supplies (UPSs), a ring bus, at least one load electrically coupled to the plurality of UPSs and the ring bus, and a controller communicatively coupled to the plurality of UPSs. The controller is configured to calculate a phase angle for each UPS of the plurality of UPSs, wherein the phase angle is calculated relative to a common reference angle, and control operation of each UPS based on the respective calculated phase angles.

公开(公告)号：US09843188B2

公开(公告)日：2017-12-12

申请号：US14529190

申请日：2014-10-31

Applicant: Liebert Corporation

Inventor： Xian Chen ,  Brian P. Heber

IPC: H02J7/00 ,  H02J9/00 ,  H02J3/08 ,  H02J3/00 ,  H02J3/40 ,  H02J9/06

CPC classification number: H02J3/08 ,  H02J3/005 ,  H02J3/40 ,  H02J9/00 ,  H02J9/062 ,  Y02P80/14 ,  Y02P80/152 ,  Y10T307/62

Abstract: A multiple uninterruptible power supply system includes at least two uninterruptible power supply modules. Each uninterruptible power supply module has a control unit with the control unit coupled to a synchronization bus. The uninterruptible power supply module are synchronized to each other with one of the uninterruptible power supply modules being operated as a sync master UPS and its control unit sending synchronization signals on the synchronization bus that are received on the synchronization bus by control units of each of the other uninterruptible power supply module which are each operated as a slave UPS synchronized to the sync master UPS. When a bypass power source for the uninterruptible power supply module that is being operated as the sync master becomes unqualified, another one of the UPS modules is operated as the sync master and its control unit then sends out the synchronization signals.

公开(公告)号：US20160285263A1

公开(公告)日：2016-09-29

申请号：US14866984

申请日：2015-09-27

Applicant: State Grid Hebei Electric Power Research Institute ,  Hebei Electric Power Commissioning Institute

Inventor： Wenping HU ,  Jie GUO ,  Lei WANG ,  Xiaobo DUAN

IPC: H02J1/00 ,  H02M7/04 ,  H02M3/04

CPC classification number: H02J1/00 ,  H02H7/122 ,  H02J1/06 ,  H02J3/08

Abstract: Provided are an anti-islanding method for a distributed generator in a direct current distribution grid and an anti-islanding device therefor. The method includes: feeding an alternating voltage component into an output end of the AC/DC interface transverter, a frequency of the alternating voltage component being less than the power frequency; sampling a first voltage signal of an output end of the DC/DC transverter; extracting a first effective value of an alternating signal included in the first voltage signal; comparing the first effective value with a first preset voltage; and controlling the distributed generator to stop operation, in a case that it is determined that the first effective value is less than the first preset voltage, which indicates that islanding occurs for the distributed generator.

Abstract translation: 提供一种用于直流配电网中的分布式发电机的防孤岛方法及其防孤岛装置。 该方法包括：将交流电压分量馈送到AC / DC接口转换器的输出端，交流电压分量的频率小于功率频率; 对DC / DC变换器的输出端的第一电压信号进行采样; 提取包括在第一电压信号中的交流信号的第一有效值; 将第一有效值与第一预设电压进行比较; 并且在确定第一有效值小于第一预设电压的情况下控制分布式发电机停止运行，这表明发生了分布式发电机的孤岛化。

公开(公告)号：US09401661B2

公开(公告)日：2016-07-26

申请号：US14324299

申请日：2014-07-07

Applicant: SMA Solar Technology AG

Inventor： Stephanie Coors ,  Tobias Mueller ,  Oliver Prior

IPC: H02M7/44 ,  H02M7/42 ,  H02J3/08 ,  H02J3/38 ,  H02J3/40 ,  H02M7/5387

CPC classification number: H02M7/42 ,  H02J3/08 ,  H02J3/383 ,  H02J3/40 ,  Y02E10/563 ,  Y10T307/735

Abstract: The invention relates to a process of connecting an AC output of a transformerless inverter of a solar power plant to an internal AC power grid at an input side of a galvanic isolation, while an offset voltage for shifting a potential center point of a photovoltaic generator connected to the inverter is applied. The process includes: (i) synchronizing the inverter with the power grid; (ii) essentially matching a potential center point of the current-carrying lines of the AC output and a potential center point of the power grid, while only one of the potential center points of the current-carrying lines and the power grid is yet shifted by the offset voltage; and (iii) galvanically connecting all current-carrying lines of the AC output with the power grid only after the steps of synchronizing and essentially matching.

Abstract translation: 本发明涉及一种将太阳能发电厂的无变压器逆变器的交流输出连接到电隔离输入侧的内部交流电网的过程，同时用于使光伏发电机的潜在中心点相连的偏移电压 到变频器应用。 该过程包括：（i）使逆变器与电网同步; （ii）基本上匹配交流输出的载流线路的电位中心点和电网的潜在中心点，而载流线路和电网的潜在中心点中只有一个仍然偏移 通过偏移电压; 和（iii）仅在同步和基本匹配的步骤之后将AC输出的所有载流线与电网电连接。

公开(公告)号：US20160148106A1

公开(公告)日：2016-05-26

申请号：US15011290

申请日：2016-01-29

Applicant: General Electric Technology GmbH

Inventor： Jay Payne Britton

IPC: G06N5/04 ,  G06N99/00 ,  G01R31/40

CPC classification number: G06N5/04 ,  G01R31/40 ,  G06N20/00 ,  H02J3/00 ,  H02J3/08 ,  H02J2003/007 ,  Y02E60/76 ,  Y04S40/22

Abstract: Aspects of state estimation for cooperative electrical grids are disclosed. State estimation of a local electrical grid can be based on a local grid model and local electrical grid information. The local state estimation can reflect interactions and interconnections with other electrical grids by determining state estimation solution information based on the local grid model, local electrical grid information, and remote state estimator solution information associated with the other electrical grid. As such, a local state estimator can be configured to receive and employ remote state estimator solution information. This can be in addition to the more conventional technique or receiving a remote grid model and remote electrical grid information to estimate the conditions of the remote electrical grid. Further, state estimation solution information can be incremental to further reduce the amount of information to be transferred and the time needed to accomplish transmission of the information.

Abstract translation: 披露了协同电网状态估计方面。 局部电网的状态估计可以基于局部电网模型和局部电网信息。 局部状态估计可以通过基于与其他电网相关联的局部网格模型，局部电网信息和远程状态估计器解决方案信息来确定状态估计解决方案信息来反映与其它电网的相互作用和互连。 因此，本地状态估计器可以被配置为接收和使用远程状态估计器解决方案信息。 这可以是更传统的技术或接收远程电网模型和远程电网信息以估计远程电网的条件的补充。 此外，状态估计解决方案信息可以是增量的，以进一步减少要传送的信息量以及完成信息传输所需的时间。

公开(公告)号：US20130121029A1

公开(公告)日：2013-05-16

申请号：US13671914

申请日：2012-11-08

Applicant: SMA Solar Technology AG

Inventor： Stephanie Coors ,  Tobias Mueller ,  Oliver Prior

IPC: H02J3/08 ,  H02M7/42

CPC classification number: H02M7/42 ,  H02J3/08 ,  H02J3/383 ,  H02J3/40 ,  Y02E10/563 ,  Y10T307/735

Abstract: The invention relates to a process of connecting an AC output of a transformerless inverter of a solar power plant to an internal AC power grid at an input side of a galvanic isolation, while an offset voltage for shifting a potential center point of a photovoltaic generator connected to the inverter is applied. The process includes: (i) synchronizing the inverter with the power grid; (ii) essentially matching a potential center point of the current-carrying lines of the AC output and a potential center point of the power grid, while only one of the potential center points of the current-carrying lines and the power grid is yet shifted by the offset voltage; and (iii) galvanically connecting all current-carrying lines of the AC output with the power grid only after the steps of synchronizing and essentially matching.

Abstract translation: 本发明涉及一种将太阳能发电厂的无变压器逆变器的交流输出连接到电隔离输入侧的内部交流电网的过程，同时用于使光伏发电机的潜在中心点相连的偏移电压 到变频器应用。 该过程包括：（i）使逆变器与电网同步; （ii）基本上匹配交流输出的载流线路的电位中心点和电网的潜在中心点，而载流线路和电网的潜在中心点中只有一个仍然偏移 通过偏移电压; 和（iii）仅在同步和基本匹配的步骤之后将AC输出的所有载流线与电网电连接。

公开(公告)号：US08054011B2

公开(公告)日：2011-11-08

申请号：US12491824

申请日：2009-06-25

Applicant: Paul E. Marken

Inventor： Paul E. Marken

IPC: H02P5/46 ,  H02J3/00 ,  F01B21/04 ,  H02M5/16

CPC classification number: H02J3/08 ,  H02M5/32 ,  Y10T307/724

Abstract: A variable frequency transformer including: a first parallel circuit including at least two of the rotary transformers arranged in parallel and having an isolating circuit breaker connected to a rotor winding of each of the rotary transformers, and a separate synchronizing circuit breaker connected to a stator winding in each of the rotary transformers in the first parallel circuit; a first main transformer having a first winding connectable to a first power grid and a secondary winding connectable to the isolating circuit breaker in the first parallel circuit; a second main transformer having a first winding connectable to a second power grid and a secondary winding connectable to each of the synchronizing circuit breakers in the first parallel circuit, and a control system operatively connected to each of the synchronizing circuit breakers, the isolating circuit breakers and the drive motors for each of the rotary transformers.

Abstract translation: 一种变频变压器，包括：第一并联电路，包括并联布置的至少两个旋转变压器，并且具有连接到每个旋转变压器的转子绕组的隔离断路器，以及连接到定子绕组的单独同步断路器 在第一并联电路中的每个旋转变压器中; 第一主变压器，具有可连接到第一电网的第一绕组和可连接到第一并联电路中的隔离电路断路器的次级绕组; 第二主变压器，具有可连接到第二电网的第一绕组和可连接到第一并联电路中的每个同步断路器的次级绕组，以及可操作地连接到每个同步断路器的控制系统，隔离断路器 和每个旋转变压器的驱动电机。

公开(公告)号：US20100176606A1

公开(公告)日：2010-07-15

申请号：US12351416

申请日：2009-01-09

Applicant: George Martin Gilchrist, III ,  Erik Matthew Ogburn

Inventor： George Martin Gilchrist, III ,  Erik Matthew Ogburn

IPC: H02P9/04

CPC classification number: H02J3/08 ,  H02P9/007 ,  H02P9/48 ,  H02P2101/10 ,  H02P2101/15 ,  Y02E10/725

Abstract: A system for modulating a frequency output of a generator coupled to an electric distribution network is described herein. The system includes: a doubly-fed induction generator coupled to a power source selected from at least one of hydropower and fuel combustion, the generator providing an electrical power output having a first frequency based on a rotational speed of the generator; a controller for selecting the rotational speed of the generator; and a converter coupled to the generator for changing the frequency of the output to a selected value, in response to selecting the rotational speed. Methods for modulating a frequency output of a generator coupled to an electric distribution network are also described.

Abstract translation: 本文描述了用于调制耦合到配电网络的发电机的频率输出的系统。 该系统包括：耦合到从水力发电和燃料燃烧中的至少一个中选择的电源的双馈感应发电机，所述发电机基于发电机的转速提供具有第一频率的电功率输出; 用于选择发电机的转速的控制器; 以及耦合到所述发生器的转换器，用于响应于选择所述转速而将所述输出的频率改变为所选择的值。 还描述了用于调制耦合到配电网络的发电机的频率输出的方法。

公开(公告)号：US07468593B2

公开(公告)日：2008-12-23

申请号：US11599128

申请日：2006-11-14

Applicant: Murty V. V. S. Yalla ,  Chengbin Hou

Inventor： Murty V. V. S. Yalla ,  Chengbin Hou

IPC: G05B19/29

CPC classification number: H02J3/005 ,  H02J3/08

Abstract: In industrial complexes and power stations a main source of power is connected to a motor bus to which motors and other loads are connected. In such systems an auxiliary source of power is provided to alternatively provide electric energy to the motor bus should the main source of power be interrupted. In the prior art digital system, samples are taken of the motor bus and auxiliary system voltage waveform with a fixed time window to predict the proper time for closing the breaker. The present invention improves on the prior art by applying the concept of an adaptive time window wherein the number of samples taken during each cycle to obtain the operating parameters is increased as the frequency decreases. This provides more accurate parameters for calculating the point for closing.