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    • 5. 发明授权
    • System and method for coordinating shunt reactance switching
    • 用于协调分励电抗切换的系统和方法
    • US5402057A
    • 1995-03-28
    • US874151
    • 1992-04-27
    • Robert D'AquilaNicholas W. Miller
    • Robert D'AquilaNicholas W. Miller
    • H02J3/18G05F1/70
    • H02J3/1828Y02E40/30
    • A system and method for coordinating shunt reactance switching in a system with a transformer having a primary voltage and a secondary voltage for supplying low voltage power to a load. Voltage and power meters are provided for measuring the primary voltage and the reactive power flowing to the load. A programmable logic controller receives as one set of inputs measurements of primary voltage and reactive power flowing to the load, and as another set of inputs, predetermined ranges establishing high and low limits for the primary voltage and the reactive power. Based on these inputs, the programmable logic controller connects or disconnects at least one shunt reactance to maintain the load voltage substantially constant.
    • 一种用于协调系统中具有初级电压和次级电压的变压器的并联电抗切换的系统和方法,用于向负载提供低电压电力。 电压和功率计用于测量初级电压和流向负载的无功功率。 可编程逻辑控制器接收作为一组输入的测量的初级电压和无功功率的测量流向负载,并且作为另一组输入,预定范围建立初级电压和无功功率的高限和低限。 基于这些输入,可编程逻辑控制器连接或断开至少一个并联电抗以维持负载电压基本恒定。
    • 7. 发明授权
    • Wind turbine and method for operating same
    • 风力发电机及其运行方法
    • US07586206B2
    • 2009-09-08
    • US12346248
    • 2008-12-30
    • Werner BartonWilhelm JanssenRobert DelmericoNicholas W. Miller
    • Werner BartonWilhelm JanssenRobert DelmericoNicholas W. Miller
    • F03B13/10
    • F03D7/0284F03D9/255F05B2220/70644F05B2240/96F05B2270/1041F05B2270/337H02J3/38Y02E10/723Y02E10/725Y02E10/763
    • A wind turbine includes an asynchronous generator having a rotor and a stator, means for determining an actual torque-speed curve of the generator, means for determining an actual grid frequency, and means for determining a shifted torque-speed curve in response to the determined actual grid frequency if the determined actual grid frequency is higher than a predetermined upper frequency limit or lower than a predetermined lower frequency limit. The means for determining a shifted torque-speed curve is further adapted to determine the shifted torque-speed curve such that an increase in the rotor voltage of said generator rotor is counteracted when shifting the actual torque-speed curve to the shifted torque-speed curve. The wind turbine further includes means for shifting the actual torque-speed curve of the generator to the shifted torque-speed curve.
    • 风力涡轮机包括具有转子和定子的异步发电机,用于确定发电机的实际扭矩 - 速度曲线的装置,用于确定实际电网频率的装置,以及用于根据所确定的确定实际电网频率来确定移动的转矩 - 速度曲线的装置 如果所确定的实际电网频率高于预定的上限频率或低于预定的下限频率,则实际电网频率。 用于确定移动的转矩 - 速度曲线的装置还适于确定移动的转矩 - 速度曲线,使得当将实际转矩 - 速度曲线移动到移动的转矩 - 速度曲线时,所述发电机转子的转子电压的增加被抵消 。 风力涡轮机还包括用于将发电机的实际扭矩 - 速度曲线转换到移动的扭矩 - 速度曲线的装置。
    • 9. 发明授权
    • Phase-shifting transformer system
    • 移相变压器系统
    • US5166597A
    • 1992-11-24
    • US742859
    • 1991-08-08
    • Einar V. LarsenNicholas W. Miller
    • Einar V. LarsenNicholas W. Miller
    • G05F1/00G05F1/20G05F5/04H02J3/18H02P13/06
    • G05F1/20H02J3/1814H02J3/1878H02P13/06Y02E40/10Y02E40/18Y02E40/30
    • A faster, more controllable phase-shifting transformer system is provided, along with a method of retrofitting and upgrading a preexisting system for faster operation, and a method of applying a desired phase shift to the voltage on a polyphase transmission line. A phase-shifting transformer set has series and regulating transformers coupled together by a switching network, An optional modulator modulates the phase shift voltage about a nominal level established by the switching network. The modulator may be a variable susceptance switched inductor or a switched capacitor, or a variable source device, such as a voltage source inverter device or a synchronous condenser. A thyristor augmented switching network may have a pair of thyristor valves augmenting a reversing switch, or a thyristor augmented load tap changer for varying the phase shift discreet step magnitude. Continuous control over the effective phase shift is obtained by partial conduction control of a thyristor valve with a harmonic filter in parallel with each excited winding of the series transformer, and by including a harmonic filter across the ends of regulating winding of the regulating transformer.
    • 提供了一种更快,更可控的相移变压器系统,以及用于更新操作的先前存在的系统的改进和升级的方法,以及将多个相移传输线上的电压施加期望的相移的方法。 一个移相变压器组具有通过开关网络耦合在一起的串联和调节变压器。可选调制器以相对于交换网络建立的标称电平调制相移电压。 调制器可以是可变电纳开关电感器或开关电容器,或诸如电压源逆变器装置或同步电容器的可变源装置。 可控硅增强开关网络可以具有增加反向开关的一对晶闸管阀,或者用于改变相移离散步距的可控硅增强式有载分接开关。 通过使用谐波滤波器与串联变压器的每个激励绕组并联的晶闸管阀的部分导通控制,并通过在调节变压器的调节绕组的端部包括谐波滤波器来获得对有效相移的连续控制。