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公开(公告)号：US20110298470A1
公开(公告)日：2011-12-08
申请号：US13152360
申请日：2011-06-03
IPC分类号： G01R31/08
CPC分类号： H02M1/32
摘要： A system for the detection of welded contacts in a circuit of a line converter system has a plurality of inverter switches, a plurality of utility switches in which a pair of utility switches is connected in series through a line to a utility, a voltage detector, an electronic controller, and a DC input source. The line converter system converts incoming DC power into AC output power that is delivered to the utility grid. The voltage detector measures the voltage across a first node and a second node of the circuit and provides an output that is interpreted by an electronic controller for each step performed during a method of detection of welded contacts. The detection method has a sequence of test steps in which at least one switch is opened and/or closed, a DC bus of the inverter or the utility grid is used as a stimulus voltage, and the voltage is measured. If a voltage is not detected across the first and second nodes, the test sequence is continued until a welded contact is detected or the electronic controller determines that none of the contacts are welded. If the controller determines that none of the contacts are welded, the line converter system is permitted to connect and supply AC power to the utility.
摘要翻译： 用于检测线路转换器系统的电路中的焊接触点的系统具有多个逆变器开关，多个效用开关，其中一对效用开关通过线路串联连接到公用设施，电压检测器， 电子控制器和DC输入源。 线路转换器系统将输入的直流电力转换成交付输出功率，并输送到公用电网。 电压检测器测量电路的第一节点和第二节点上的电压，并提供由电子控制器解释的输出，用于在焊接触点的检测方法期间执行的每个步骤。 检测方法具有一系列测试步骤，其中至少一个开关被打开和/或关闭，逆变器或公用电网的DC总线用作激励电压，并且测量电压。 如果在第一和第二节点之间没有检测到电压，则继续测试序列直到检测到焊接接触点，或者电子控制器确定没有焊接接触点。 如果控制器确定没有一个触点被焊接，则允许线路转换器系统连接并向公用设施提供AC电力。
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公开(公告)号：US20110299312A1
公开(公告)日：2011-12-08
申请号：US13151766
申请日：2011-06-02
IPC分类号： H02M7/5387
CPC分类号： H02M7/487 , H02J3/383 , Y02E10/563
摘要： A full-bridge, NPC inverter uses pulse width modulation (PWM) to convert the DC voltage from a solar panel array to an AC voltage at the output of the inverter that is acceptable for connection to a utility. The PWM control unit has a predetermined carrier frequency. The carrier unit uses for each carrier period either positive or negative values of a reference voltage to generate a predetermined number of signals to control the switching on and off of each of the eight inverter switching elements in a predetermined pattern for a predetermined period of the carrier frequency period to thereby produce the acceptable alternating current voltage at the inverter output and not produce between the inverter input and earth ground a carrier frequency component.
摘要翻译： 全桥NPC逆变器使用脉冲宽度调制（PWM）将来自太阳能电池板阵列的直流电压转换为连接到公用设施可接受的逆变器输出端的交流电压。 PWM控制单元具有预定的载波频率。 载波单元在每个载波周期使用参考电压的正值或负值，以产生预定数量的信号，以在载波的预定时段内以预定模式控制八个逆变器开关元件中的每一个的开关 从而在逆变器输出端产生可接受的交流电压，并且不会在变频器输入和接地之间产生载波频率分量。
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公开(公告)号：US08653823B2
公开(公告)日：2014-02-18
申请号：US13152360
申请日：2011-06-03
IPC分类号： G01R31/08
CPC分类号： H02M1/32
摘要： A system for the detection of welded contacts in a circuit of a line converter system has a plurality of inverter switches, a plurality of utility switches in which a pair of utility switches is connected in series through a line to a utility, a voltage detector, an electronic controller, and a DC input source. The line converter system converts incoming DC power into AC output power that is delivered to the utility grid. The voltage detector measures the voltage across a first node and a second node of the circuit and provides an output that is interpreted by an electronic controller for each step performed during a method of detection of welded contacts. The detection method has a sequence of test steps in which at least one switch is opened and/or closed, a DC bus of the inverter or the utility grid is used as a stimulus voltage, and the voltage is measured. If a voltage is not detected across the first and second nodes, the test sequence is continued until a welded contact is detected or the electronic controller determines that none of the contacts are welded. If the controller determines that none of the contacts are welded, the line converter system is permitted to connect and supply AC power to the utility.
摘要翻译： 用于检测线路转换器系统的电路中的焊接触点的系统具有多个逆变器开关，多个效用开关，其中一对效用开关通过线路串联连接到公用设施，电压检测器， 电子控制器和DC输入源。 线路转换器系统将输入的直流电力转换成交付输出功率，并输送到公用电网。 电压检测器测量电路的第一节点和第二节点上的电压，并提供由电子控制器解释的输出，用于在焊接触点的检测方法期间执行的每个步骤。 检测方法具有一系列测试步骤，其中至少一个开关被打开和/或关闭，逆变器或公用电网的DC总线用作激励电压，并且测量电压。 如果在第一和第二节点之间没有检测到电压，则继续测试序列直到检测到焊接接触点，或者电子控制器确定没有焊接接触点。 如果控制器确定没有一个触点被焊接，则允许线路转换器系统连接并向公用设施提供AC电力。
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公开(公告)号：US06741059B2
公开(公告)日：2004-05-25
申请号：US10200689
申请日：2002-07-22
IPC分类号： H02P736
摘要： The direct torque control (DTC) principle is used to control the torque of a wound ring rotor slip induction machine, also known as a doubly fed or cascade machine, by utilizing a solid state inverter on the rotor side. In addition, the DTC principle is used to control the power factor at the stator terminals of the doubly fed machine to a desired level and also to perform the task of synchronization of stator voltage to the grid voltage. An integrated controller is used to implement these three functions.
摘要翻译： 直接转矩控制（DTC）原理用于通过在转子侧利用固态逆变器来控制绕线环转子滑动感应电机的扭矩，也称为双馈或级联机。 此外，DTC原理用于将双馈机器的定子端子的功率因数控制在所需水平，并且还执行定子电压与电网电压同步的任务。 使用集成控制器来实现这三个功能。
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公开(公告)号：US06448735B1
公开(公告)日：2002-09-10
申请号：US09842998
申请日：2001-04-26
IPC分类号： H02P736
摘要： The direct torque control (DTC) principle is used to control the torque of a wound ring rotor slip induction machine, also known as a doubly fed or cascade machine, by utilizing a solid state inverter on the rotor side. In addition, the DTC principle is used to control the power factor at the stator terminals of the doubly fed machine to a desired level and also to perform the task of synchronization of stator voltage to the grid voltage. An integrated controller is used to implement these three functions.
摘要翻译： 直接转矩控制（DTC）原理用于通过在转子侧利用固态逆变器来控制绕线环转子滑动感应电机的扭矩，也称为双馈或级联机。 此外，DTC原理用于将双馈机器的定子端子的功率因数控制在所需水平，并且还执行定子电压与电网电压同步的任务。 使用集成控制器来实现这三个功能。
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公开(公告)号：US5623219A
公开(公告)日：1997-04-22
申请号：US551779
申请日：1995-11-07
申请人： Douglas W. Karraker
发明人： Douglas W. Karraker
CPC分类号： H03C1/00
摘要： An inverter control circuit includes means for continuously computing and subtracting an average voltage from each of three modulating input waveforms. The average voltage is computed by determining the instantaneous maximum and minimum voltages of the three waveforms, summing these voltages, and then dividing them by an averaging factor. The shifted modulating waveforms are then compared with a high-frequency carrier wave to modulate the duty cycles of the inverter outputs to approximate desired output waveform characteristics.
摘要翻译： 逆变器控制电路包括用于从三个调制输入波形中的每一个连续计算和减去平均电压的装置。 通过确定三个波形的瞬时最大和最小电压，对这些电压求和，然后将它们除以平均因子来计算平均电压。 然后将移位的调制波形与高频载波进行比较，以调制逆变器输出的占空比以近似所需的输出波形特性。
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