公开(公告)号：US20160154065A1

公开(公告)日：2016-06-02

申请号：US14926853

申请日：2015-10-29

Applicant: ROLLS-ROYCE PLC

Inventor： Sivakumar NADARAJAN ,  Shantha Dharmasiri Gamini JAYASINGHE ,  Amit Kumar GUPTA ,  Chandana Jayampathi GAJANAYAKE ,  Viswanathan VAIYAPURI

IPC: G01R31/40

CPC classification number: G01R31/40 ,  G01R29/16 ,  G01R31/343

Abstract: A method of assessing a condition of a multi-phase power system comprises the steps of: acquiring a voltage signal and a current signal for each phase of the multi-phase power system; calculating a product of the voltage signal for each phase of the multi-phase power system with one of the current signals such that the product is between a voltage signal for one phase and a current signal for a different phase for at least two of the products; summing the calculated products; and identifying the possible existence of a fault in the multi-phase power system based on a frequency analysis of the summed calculated products.

Abstract translation: 一种评估多相电力系统状况的方法，包括以下步骤：获取多相电力系统各相的电压信号和电流信号; 使用所述电流信号之一来计算所述多相电力系统的各相的电压信号的乘积，使得所述乘积位于所述一相的电压信号与所述产品中的至少两个产品的不同相的电流信号之间 ; 计算产品的总和; 并基于对所计算出的产品的频率分析，确定多相电力系统中可能存在的故障。

公开(公告)号：US20150381081A1

公开(公告)日：2015-12-31

申请号：US14747437

申请日：2015-06-23

Applicant: ROLLS-ROYCE PLC

Inventor： Bikramjit Singh BHANGU ,  Chandana Jayampathi GAJANAYAKE ,  Don Mahinda VILATHGAMUWA ,  Gilbert Hock Beng FOO

IPC: H02P6/00 ,  H02P23/14

CPC classification number: H02P23/14 ,  H02P6/34 ,  H02P21/0089 ,  H02P21/141 ,  H02P21/18

Abstract: A method of controlling an AC machine that includes a stator and a rotor, wherein the method includes, whilst operating the AC machine according to an overmodulation technique: determining a reference speed for controlling the operation of the AC machine; filtering the reference speed such that if the reference speed exceeds a speed limit of the AC machine, the reference speed is reduced towards that speed limit; and controlling the operation of the AC machine based on the filtered reference speed. It has been found that controlling the AC machine in this way helps to inhibit “windup” of a controller used to implement the method, even if the overmodulation technique sets a non-constant maximum voltage.

Abstract translation: 一种控制包括定子和转子的交流电机的方法，其中所述方法包括：根据过调制技术操作所述交流电机;确定用于控制所述交流电机的操作的参考速度; 过滤参考速度，使得如果参考速度超过交流电机的速度限制，则基准速度降低到该速度限制; 并且基于滤波的参考速度来控制AC机器的操作。 已经发现，即使过调制技术设置非恒定的最大电压，也以这种方式控制AC电机有助于抑制用于实现该方法的控制器的“卷起”。

公开(公告)号：US20160216332A1

公开(公告)日：2016-07-28

申请号：US14991139

申请日：2016-01-08

Applicant: ROLLS-ROYCE plc

Inventor： Chandana Jayampathi GAJANAYAKE ,  Shantha Dharmasiri Gamini JAYASINGHE ,  Sivakumar NADARAJAN ,  Amit Kumar GUPTA

IPC: G01R31/327 ,  G01R31/40

CPC classification number: G01R31/42

Abstract: A method of open-switch fault detection in a two-level voltage source power converter comprises the steps of: i. acquiring the waveforms of three-phase alternating current of the two-level voltage source power converter; ii. calculating at least a first time derivative of each acquired waveform; and iii. using the at least first time derivatives to determine whether an open-switch fault is present in the two-level voltage source power converter.

Abstract translation: 一种二电平电压源功率转换器中开路故障检测的方法，包括以下步骤： 获取二电平电压源功率转换器的三相交流电波形; ii。 计算每个获取的波形的至少第一时间导数; 和iii。 使用至少第一次导数来确定两级电压源功率转换器中是否存在开路开关故障。

公开(公告)号：US20150198655A1

公开(公告)日：2015-07-16

申请号：US14573759

申请日：2014-12-17

Applicant: ROLLS-ROYCE PLC.

Inventor： Vaiyapuri VISWANATHAN ,  Amit Kumar GUPTA ,  Chandana Jayampathi GAJANAYAKE ,  Sivakumar NADARAJAN

IPC: G01R31/26 ,  G01R23/02

CPC classification number: G01R31/2632 ,  G01R23/02 ,  G01R31/343 ,  G01R31/40 ,  H02H7/1255 ,  H02K11/20

Abstract: A method of detecting a diode fault in an AC signal rectifier circuit, the AC signal rectifier circuit including a plurality of diodes, and being arranged to supply a rectified output voltage to a load, wherein the method includes the steps of deriving an operating value indicative of the ratio of the voltage magnitudes of a first harmonic frequency and another harmonic frequency of the rectified output voltage across the load; and determining whether a fault has occurred in one or more diodes on the basis of the derived operating value. The first harmonic frequency is preferably the fundamental harmonic frequency, and/or the another harmonic frequency is preferably the 6th harmonic frequency.

Abstract translation: 一种检测交流信号整流电路中的二极管故障的方法，所述交流信号整流电路包括多个二极管，并且被布置为向负载提供经整流的输出电压，其中所述方法包括以下步骤：导出指示 的一次谐波频率的电压幅度与整个负载的整流输出电压的另一个谐波频率之比; 以及基于导出的操作值来确定在一个或多个二极管中是否发生故障。 一次谐波频率优选为基本谐波频率，和/或另一谐波频率优选为6次谐波频率。

公开(公告)号：US20160172935A1

公开(公告)日：2016-06-16

申请号：US14942064

申请日：2015-11-16

Applicant: ROLLS-ROYCE plc

Inventor： Stephen J MOUNTAIN ,  Chandana Jayampathi GAJANAYAKE ,  Meng Yeong LEE

IPC: H02K7/20 ,  H02K7/116 ,  H02K11/00

CPC classification number: H02K7/20 ,  F16H3/724 ,  H02K7/116 ,  H02K11/0073 ,  H02K11/38 ,  H02P5/747 ,  H02P27/04

Abstract: A variable speed drive arrangement including: a load; a gearbox to supply mechanical drive to the load; a converter electrically coupled with a power grid. Also a primary electrical machine to supply mechanical power to the gearbox and to receive electrical power; and a secondary electrical machine mechanically coupled to the gearbox and electrically coupled to the converter. An electrical circuit breaker to selectively electrically couple the primary electrical machine to the secondary electrical machine or to the power grid; wherein the secondary electrical machine is adapted to supply or extract mechanical energy from the gearbox and to receive or deliver electrical energy to the converter. Also a control method for the arrangement including a starting mode and a running mode.

Abstract translation: 一种变速驱动装置，包括：负载; 一个为负载提供机械驱动的变速箱; 与电网电耦合的转换器。 还有一个主要的电机向齿轮箱提供机械动力并接收电力; 以及机械地联接到所述齿轮箱并且电耦合到所述转换器的次级电机。 一种用于选择性地将初级电机电耦合到次级电机或电网的电路断路器; 其中所述次级电机适于从所述齿轮箱供应或提取机械能并将所述电能接收或传送到所述转换器。 还有一种用于包括启动模式和运行模式的装置的控制方法。

公开(公告)号：US20140203754A1

公开(公告)日：2014-07-24

申请号：US14161403

申请日：2014-01-22

Applicant: ROLLS-ROYCE PLC

Inventor： Bikramjit Singh BHANGU ,  Chandana Jayampathi GAJANAYAKE ,  Don Mahinda VILATHGAMUWA ,  Gilbert Foo Hock BENG

IPC: H02P21/00 ,  H02P21/12

CPC classification number: H02P21/0089 ,  H02P21/12 ,  H02P23/009

Abstract: A method of controlling an AC machine that includes a stator and a rotor. The method includes observing a stability parameter that is indicative of the stability of the AC machine and dependent on a current state of the AC machine; and controlling the AC machine based on the observed stability parameter so as to promote stable operation of the AC machine. The method may include controlling the AC machine to operate as a motor or as a generator. The AC machine may be a permanent magnet synchronous machine. A controller suitable for performing the method is also disclosed.

Abstract translation: 一种控制包括定子和转子的交流电机的方法。 该方法包括观察指示交流电机的稳定性并取决于交流电机的当前状态的稳定性参数; 并根据观察到的稳定性参数控制交流电机，以促进交流电机的稳定运行。 该方法可以包括控制AC电机作为电动机或发电机运行。 交流电机可以是永磁同步电机。 还公开了适用于执行该方法的控制器。

公开(公告)号：US20160266208A1

公开(公告)日：2016-09-15

申请号：US15050718

申请日：2016-02-23

Applicant: ROLLS-ROYCE plc

Inventor： Subash Chandar ATHIKESSAVAN ,  Sivakumar NADARAJAN ,  Amit Kumar GUPTA ,  Sanjib Kumar PANDA ,  Chandana Jayampathi GAJANAYAKE

IPC: G01R31/34

CPC classification number: G01R31/346 ,  H02P29/0241

Abstract: A method of detecting rotor and/or stator side faults in an induction motor. Signals indicative of three-phase stator currents of the induction motor are acquired (10) and converted (16) into three-phase current phasors. The three-phase current phasors are combined (16) to obtain a quantity having a DC component and an AC component. A frequency spectrum of the AC component is obtained (18) and compared (20,22) to a frequency spectrum of the AC component under healthy operating conditions in order to determine the presence of a rotor and/or stator side fault in the induction motor

Abstract translation: 检测感应电动机中转子和/或定子侧故障的方法。 获取表示感应电动机的三相定子电流的信号（10）并将其转换为三相电流相量。 组合三相电流相量（16）以获得具有DC分量和AC分量的量。 获得交流分量的频谱（18）并比较（20,22）到健康运行条件下交流分量的频谱，以便确定感应电机中转子和/或定子侧故障的存在

公开(公告)号：US20160218650A1

公开(公告)日：2016-07-28

申请号：US15001781

申请日：2016-01-20

Applicant: ROLLS-ROYCE plc

Inventor： Chandana Jayampathi GAJANAYAKE ,  Amit Kumar GUPTA ,  Robert SLATER ,  Bikramjit BHANGU ,  Gilbert Hock Beng FOO ,  Don Mahinda VILATHGAMUWA

IPC: H02P9/10 ,  F01D15/12 ,  F01D25/04 ,  F01D15/10

CPC classification number: H02P9/102 ,  F01D15/10 ,  F01D15/12 ,  F01D25/04 ,  F05D2220/30 ,  F05D2260/40311 ,  F05D2260/96 ,  F16F15/002 ,  F16F15/18

Abstract: The invention concerns the damping of torsional oscillations/vibrations, particularly during electrical power generation within a gas turbine such as a civil aviation engine. The method of the invention relies on actively generating compensating oscillations in a driveline of a system to actively damp undesirable oscillations existing in the system.

Abstract translation: 本发明涉及扭转振动/振动的阻尼，特别是在诸如民用航空发动机的燃气轮机内的发电期间。 本发明的方法依赖于主动产生系统的传动系统中的补偿振荡，以主动地抑制系统中存在的不期望的振荡。

公开(公告)号：US20140225659A1

公开(公告)日：2014-08-14

申请号：US14167088

申请日：2014-01-29

Applicant: ROLLS-ROYCE PLC

Inventor： Bikramjit BHANGU ,  Mohamed Halick Mohamed SATHIK ,  Sivakumar NADARAJAN ,  Chandana Jayampathi GAJANAYAKE

IPC: H03K17/14

CPC classification number: H03K17/145 ,  H01L2924/0002 ,  H01L2924/00

Abstract: A thermal controller for driving a gate control unit of a gate-driven semiconductor switching device, the thermal controller comprising a junction temperature estimation module for generating an estimated junction temperature for the switching device, a gate voltage control module for modifying a gate voltage of the switching device, a switching frequency control module for modifying a switching frequency of the switching device, and a duty cycle control module for modifying the duty cycle of the switching device. In use, the thermal controller is adapted to activate one of the gate voltage control module, switching frequency control module and duty cycle control module dependent upon the estimated junction temperature in order to maintain the actual junction temperature below a pre-determined limit.

Abstract translation: 一种用于驱动栅极驱动半导体开关器件的栅极控制单元的热控制器，所述热控制器包括用于产生所述开关器件的估计结温的结温估计模块，用于修改所述栅极电压的栅极电压的栅极电压控制模块 开关装置，用于修改开关装置的开关频率的开关频率控制模块，以及用于修改开关装置的占空比的占空比控制模块。 在使用中，热控制器适于根据估计的结温激活门电压控制模块，开关频率控制模块和占空比控制模块中的一个，以便将实际结温保持在预定极限以下。