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公开(公告)号：US09617980B2
公开(公告)日：2017-04-11
申请号：US14914226
申请日：2014-06-24
发明人： Toru Okazaki , Taketsune Nakamura
IPC分类号： F03D9/00 , H02P9/04 , F03D1/06 , F03D7/02 , H02P9/00 , H02P101/15 , H02P103/10
CPC分类号： F03D9/22 , F03D1/06 , F03D7/028 , F03D9/11 , F03D9/25 , F03D80/60 , F05B2220/602 , F05B2260/20 , H02P9/00 , H02P29/62 , H02P2101/15 , H02P2103/10 , Y02E10/721 , Y02E10/723 , Y02E10/725
摘要： A wind power generating system includes: a wind mill, an induction rotating machine coupled to a rotating shaft of the wind mill; a power converting device that supplies exciting current to the induction rotating machine; a heat medium circulating structure that circulates a heat medium that receives heat generated by the induction rotating machine; a heat accumulator that accumulates heat of the heat medium; a thermal power generator that converts, into electric power, the heat of the heat medium accumulated in the heat accumulator; and an armature control unit that controls the exciting current in accordance with electric power demand of an electric power system. The armature control unit performs one or both of power generation mode control in which the induction rotating machine is operated as a power generator and heat generation mode control in which the induction rotating machine is operated as a heat generator.
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公开(公告)号：US20230283071A1
公开(公告)日：2023-09-07
申请号：US18016076
申请日：2021-07-15
发明人： FOLKE GIESSLER , OLIVER REIMANN
CPC分类号： H02J1/102 , H02J3/0073 , H02M7/219 , H02P3/02 , H02P2103/10
摘要： An electrical power supply system, in particular for a microgrid, includes a DC bus, and a first rectifier and a second rectifier, with the first and second rectifiers each supplying power to the DC bus. The first rectifier is a diode rectifier and the second rectifier has switchable power semiconductors. The electrical power supply system further includes a generator supplying power to both rectifiers. The rectifiers can be connected at different times according to a load.
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公开(公告)号：US20180026563A1
公开(公告)日：2018-01-25
申请号：US15218121
申请日：2016-07-25
CPC分类号： H02P9/48 , F03D7/0272 , F03D7/0276 , F03D7/028 , F03D7/042 , F03D9/255 , H02K3/28 , H02K2213/09 , H02P9/007 , H02P25/184 , H02P2101/15 , H02P2103/10 , H02P2103/20 , Y02E10/725
摘要： The present subject matter is directed to an electrical power circuit connected to a power grid and method of operating same. The electrical power circuit has a power converter electrically coupled to a generator, such as a doubly-fed induction generator, having a rotor and a stator. Thus, the method includes operating rotor connections of the rotor of the generator in a wye configuration during a first rotor speed operating range. Further, the method includes monitoring a rotor speed of the rotor of the generator. Thus, the method also includes transitioning the rotor connections of the rotor from the wye configuration to a delta configuration if the rotor speed changes to a second rotor speed operating range.
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4.发明申请公开(公告)号：US20190058426A1
公开(公告)日：2019-02-21
申请号：US16104991
申请日：2018-08-20
CPC分类号： H02P9/305 , F03B13/06 , H02P9/007 , H02P9/102 , H02P23/08 , H02P29/68 , H02P2101/10 , H02P2103/10
摘要： A system and method of operating a pumped storage power plant using a double fed induction machine with a frequency converter in a rotor circuit is disclosed. A current target value for the rotor current frequency is determined based on a target power to be transmitted between an electrical grid and the double fed induction machine depending on measured actual operating variables. A current inadmissible synchronous deadband is determined depending on variables characterizing a current state of the pumped storage power plant. The synchronous deadband is determined by a permissible minimum required rotor current frequency or speed difference of the rotor speed from the synchronous speed for the stationary operation. The converter is controlled to generate voltages and currents with the current target value of the rotor current frequency if the current target value of the rotor current frequency or speed does not fall in the current inadmissible synchronous deadband.
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公开(公告)号：US20160201650A1
公开(公告)日：2016-07-14
申请号：US14914226
申请日：2014-06-24
发明人： Toru OKAZAKI , Taketsune NAKAMURA
CPC分类号： F03D9/22 , F03D1/06 , F03D7/028 , F03D9/11 , F03D9/25 , F03D80/60 , F05B2220/602 , F05B2260/20 , H02P9/00 , H02P29/62 , H02P2101/15 , H02P2103/10 , Y02E10/721 , Y02E10/723 , Y02E10/725
摘要： A wind power generating system includes: a wind mill, an induction rotating machine coupled to a rotating shaft of the wind mill; a power converting device that supplies exciting current to the induction rotating machine; a heat medium circulating structure that circulates a heat medium that receives heat generated by the induction rotating machine; a heat accumulator that accumulates heat of the heat medium; a thermal power generator that converts, into electric power, the heat of the heat medium accumulated in the heat accumulator; and an armature control unit that controls the exciting current in accordance with electric power demand of an electric power system. The armature control unit performs one or both of power generation mode control in which the induction rotating machine is operated as a power generator and heat generation mode control in which the induction rotating machine is operated as a heat generator.
摘要翻译： 风力发电系统包括：风力发电机，耦合到风力发电机的旋转轴的感应旋转机; 向感应旋转机提供励磁电流的电力转换装置; 使接收由感应旋转机产生的热量的热介质循环的热介质循环结构; 蓄热器，其累积热介质的热量; 将蓄热器内的热介质的热量转换为电力的火力发电机; 以及电枢控制单元，其根据电力系统的电力需求来控制励磁电流。 电枢控制单元执行感应旋转机器作为发电机运行的发电模式控制和感应旋转机器作为发热体运转的发热模式控制中的一个或两个。
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公开(公告)号：US20240313678A1
公开(公告)日：2024-09-19
申请号：US18281824
申请日：2022-03-02
IPC分类号： H02P9/00 , F03D9/25 , H02P101/15 , H02P103/10
CPC分类号： H02P9/008 , F03D9/25 , H02P9/007 , F05B2220/706 , H02P2101/15 , H02P2103/10
摘要： A method of controlling the operation of a doubly fed induction machine is provided. The DFIM includes a stator electrically coupled to a power grid and a rotor rotating with a rotational speed. The DFIM has a synchronous rotational speed of the rotor and a rated rotational speed of the rotor. Rotation of the rotor at the synchronous rotational speed generates one or more slot harmonic distortions having a harmonic order. The method comprises operating the DFIM at the rated rotational speed of the rotor, wherein the rated rotational speed of the rotor is set to a value selected such that a shift of the harmonic order of one or more of the slot harmonic distortions at the rated rotational speed of the rotor is an integer number or is within a predefined limit of an integer number.
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公开(公告)号：US20240235200A1
公开(公告)日：2024-07-11
申请号：US18560123
申请日：2022-05-10
申请人： Terna S.p.A.
发明人： Francesco PALONE , Luca BUONO , Marco PIETRUCCI
IPC分类号： H02J3/30 , H02P9/00 , H02P103/10
CPC分类号： H02J3/30 , H02P9/007 , H02P2103/10
摘要： The invention relates to a system for supporting the stability of an electrical grid by storing/releasing electrical energy from/to said electrical grid, comprising: an asynchronous electric machine including a rotor provided with an accessible rotor circuit and a stator provided with a stator circuit; a flywheel coupled to the rotor; a static converter, and electronic control means. The stator circuit is connected to the electrical grid to be fed by the latter. The static converter is connected between the electrical grid and the rotor circuit and is controllable to supply said rotor circuit with an electrical power supply with adjustable frequency and voltage. The asynchronous electric machine is configured to: absorb electrical energy from the electrical grid by converting the absorbed electrical energy into kinetic energy and storing said kinetic energy by means of the flywheel; and deliver electrical energy to the electrical grid by converting the stored kinetic energy by means of the flywheel into electrical energy and providing the latter to the electrical grid. The electronic control means are configured to: receive measurement data indicative of a measured electrical grid frequency; determine, based on the received measurement data, ROCOF values indicative of a derivative of the measured frequency of the electrical grid; and control the operation of the static converter based on the determined ROCOF values. Furthermore, in case of a change in the frequency of the electrical grid, the asynchronous electric machine is configured to immediately provide an uncontrolled natural inertial response to said change in frequency by absorbing active power from the electrical grid in case of an increase in frequency or by supplying active power to the electrical grid in case of a reduction in frequency; and the electronic control means are configured to determine a given ROCOF value relative to said change in frequency and, once said given ROCOF value has been determined, begin to control the operation of the static converter such that the asynchronous electric machine begins to supply a controlled synthetic inertial response wherein the active power absorbed/supplied is modulated according to the given ROCOF value determined and the uncontrolled natural inertial response already provided.
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公开(公告)号：US20170257041A1
公开(公告)日：2017-09-07
申请号：US15506785
申请日：2015-08-25
申请人： Kevin LEE , Kai WANG , Wenxi YAO , Eaton Corporation
CPC分类号： H02K17/02 , H02P1/28 , H02P1/30 , H02P23/0031 , H02P27/047 , H02P2103/10
摘要： The present invention provides an acceleration method for V/f controlled induction motor in flux-weakening region, which comprises: acquiring no-load magnetizing current Im of the induction motor at current stator frequency; selecting a smaller one of 0.5·Im(1/σ+1) and (Im2+σ)/(Im+σIm) as magnetizing current set point, in which σ is an estimated total leakage inductance coefficient; getting an error signal by subtracting the magnetizing current of the induction motor from the magnetizing current set point; determining the stator frequency for the next control period according to the error signal which is provided as a controlling variable of negative feedback. The acceleration method of the present invention can provide the maximum output torque in flux-weakening region and has a larger tolerance for the error of the estimated leakage inductance.
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