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公开(公告)号：US5047915A
公开(公告)日：1991-09-10
申请号：US543984
申请日：1990-06-26
IPC分类号： H02M5/27
CPC分类号： H02M5/271
摘要： A current fed unrestricted frequency converter (UFC) for supplying power with balanced voltages to a three-phase unbalanced load generates two sets of existence functions for controlling the switching matrices of the UFC to generate positive and negative sequence current components in the load. Existence function generators generating the positive and negative sequence existence functions are phase locked, respectively, to a positive sequence reference signal generated by a clock and a negative sequence reference signal derived by circuits which monitor the negative sequence voltage in the load. Select circuits alternately gate the positive and negative sequence existence functions to the UFC switching matrices in proportion to the detected magnitude of the negative sequence voltage in a sense to drive the negative sequence voltage in the load to zero. A neutral forming transformer eliminates any zero sequence voltage in the load so that all that remains is the positive sequence components of voltage which by definition are balanced.
摘要翻译： 用于向三相不平衡负载提供具有平衡电压的电力的电流馈送无限制变频器（UFC）产生两组存在函数，用于控制UFC的开关矩阵以在负载中产生正序和负序电流分量。 产生正序和负序存在函数的存在函数发生器分别锁相于由监视负载中的负序电压的电路导出的时钟和负序参考信号产生的正序参考信号。 与负序电压的检测幅度成比例的选择电路将正序和负序存在函数交替地切换到UFC开关矩阵，从而将负载中的负序电压驱动为零。 中性成形变压器消除了负载中的任何零序电压，使得保留的所有电压是根据定义平衡的电压的正序分量。
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2.发明授权Converting multiphase power from one frequency to another using current waveforms 失效使用当前波形将多相功率从一个频率转换到另一个频率
公开(公告)号：US4439823A
公开(公告)日：1984-03-27
申请号：US338777
申请日：1982-01-11
申请人： Laszlo Gyugyi , Geoffrey M. Smith , Eric J. Stacey
发明人： Laszlo Gyugyi , Geoffrey M. Smith , Eric J. Stacey
CPC分类号： H02M5/272
摘要： a multiphase AC current of one frequency is converted to a multiphase current of another frequency by a frequency changer having its output terminals terminated by a load having the impedance characteristics of a voltage source. In this arrangement the multiple phases of a practical AC current source such as a synchronous generator are connected directly to each load phase, even where the bidirectional switches of the UFC are arranged in pulse groups or a bridge configuration.
摘要翻译： 一个频率的多相交流电流被变频器转换为另一个频率的多相电流，变频器的输出端由具有电压源的阻抗特性的负载端接。 在这种布置中，即使在UFC的双向开关以脉冲组或桥式配置布置的情况下，诸如同步发生器的实际交流电流源的多相也直接连接到每个负载相。
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3.发明授权
公开(公告)号：US4172234A
公开(公告)日：1979-10-23
申请号：US880270
申请日：1978-02-23
CPC分类号： H02J3/1864 , Y02E40/12
摘要： A control circuit for a static VAR generator measures load power during consecutive half cycles of the source voltage. This information, together with load voltage and load current information is used to determine the firing angles of the VAR generator thyristors for providing compensating current for keeping the source current in phase with the source voltage and for balancing the source currents in a three-phase electrical system. The total computation time for determining the firing angles extends into the half cycle in which correction is to be applied beyond a fixed minimum firing angle.
摘要翻译： 用于静态VAR发生器的控制电路在源电压的连续半周期期间测量负载功率。 该信息与负载电压和负载电流信息一起用于确定用于提供补偿电流的VAR发生器晶闸管的触发角，以保持源电流与源电压同相并且用于平衡三相电气中的源电流 系统。 用于确定触发角的总计算时间延伸到半周期，其中校正将被施加超过固定的最小触发角。
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4.发明授权Voltage regulator utilizing a static VAR generator with half period averaging and saturating type firing angle control 失效电压调节器利用具有半周期平均和饱和型触发角度控制的静态VAR发生器
公开(公告)号：US4356441A
公开(公告)日：1982-10-26
申请号：US811796
申请日：1977-06-30
摘要： A voltage regulator is taught for maintaining the terminal voltage of a three phase transmission line at a fixed reference value. The voltage regulator system utilizes the reactance of the transmission line in conjunction with reactive current from a VAR generator to compensate for the voltage effect of line current as it flows through the line reactance. The VAR generator is of the parallel capacitor-inductor type where the inductor is controlled by a thyristor switch. The conduction of the thyristor is controlled by utilizing a control system which generates an error signal based on the half period average of line voltage. The error signal is converted to a signal which is proportional to flux linkages by an integrator and then compared with the integral of the voltage signal for determining the conduction angle of the thyristor switches.
摘要翻译： 教导电压调节器将三相传输线的端子电压保持在固定的参考值。 电压调节器系统利用传输线的电抗和来自VAR发生器的无功电流来补偿线路电流流过线路电抗时的电压影响。 VAR发生器是并联电容器 - 电感器类型，其中电感器由晶闸管开关控制。 通过利用基于线路电压的半周期平均产生误差信号的控制系统来控制晶闸管的导通。 误差信号被转换为与积分器的磁链成比例的信号，然后与用于确定晶闸管开关导通角的电压信号的积分进行比较。
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公开(公告)号：US4156176A
公开(公告)日：1979-05-22
申请号：US811795
申请日：1977-06-30
摘要： A voltage regulator is taught for maintaning the terminal voltage of a three phase transmission line at a fixed reference value. The voltage regulator system utilizes the inductive reactance of the transmission line in conjunction with reactive current from a VAR generator to compensate for the voltage effect of line current as it flows through the inductive reactance. The VAR generator is of the parallel capacitor-inductor type where the inductor is controlled by a thyristor switch. The firing range for the thyristor switch is determined by a fast acting static control system which utilizes line-to-line voltage and line-to-ground voltage as an input. A signal related to the latter voltages is processed and compared against a reference. The integrated difference thereof is utilized to determine the firing angle for the thyristor switch.
摘要翻译： 教导了一种电压调节器，用于以固定的参考值来固定三相传输线的端子电压。 电压调节器系统利用传输线的感抗与来自VAR发生器的无功电流来补偿线电流流过感抗时的电压效应。 VAR发生器是并联电容器 - 电感器类型，其中电感器由晶闸管开关控制。 晶闸管开关的触发范围由利用线对线电压和线对地电压作为输入的快速作用静态控制系统决定。 与后面的电压相关的信号被处理并与参考进行比较。 其集成差值用于确定晶闸管开关的触发角。
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公开(公告)号：US4001670A
公开(公告)日：1977-01-04
申请号：US575888
申请日：1975-05-08
申请人： Laszlo Gyugyi , John Rosa , Eric J. Stacey
发明人： Laszlo Gyugyi , John Rosa , Eric J. Stacey
CPC分类号： H02J3/1857 , H02M5/271 , Y02E40/26
摘要： An AC/AC frequency changer operating under a one to one frequency ratio has its input coupled to a power system of same frequency and voltage, with an inductor connected between its output and input terminals. The output voltage is controlled so as to deviate by a predetermined amount from the input voltage so that reactive power flows from the output to the input which, owing to the inherent phase inversion in the frequency changer, causes reactive input current and reactive output current to be summed up directly at the input terminals. As a result, the frequency changer requires only a power rating which is half the reactive power which it can supply to the power system.
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7.发明授权Phase displaced, multiple inverter bridge circuits with waveform notching for harmonic elimination 失效相位偏移，具有波形开槽的多个逆变桥式电路，用于谐波消除
公开(公告)号：US5168437A
公开(公告)日：1992-12-01
申请号：US612647
申请日：1990-11-13
申请人： Laszlo Gyugyi , Eric J. Stacey
发明人： Laszlo Gyugyi , Eric J. Stacey
CPC分类号： H02M7/49
摘要： An apparatus and method for reducing certain harmonics in the output of static inverters. Static inverters which employ a switching device arranged in a bridge circuit to convert direct current power to alternating current power produce undesired harmonics in the output of the inverter. Harmonic neutralization techniques are further improved by the invention utilizing selective notching of the inverter pole voltage and a coordinate phase shift between the set of pole voltages produced by the individual inverters. The notch angles in the individual pole voltage outputs are chosen to minimize or eliminate specific undesired harmonics.
摘要翻译： 一种用于减少静态逆变器输出中的某些谐波的装置和方法。 采用布置在桥式电路中以将直流电转换为交流电力的开关装置的静态逆变器在逆变器的输出端产生不需要的谐波。 利用本发明利用反相器极电压的选择性切换和由各个逆变器产生的极电压组之间的坐标相移来进一步改进谐波中和技术。 选择单个极电压输出中的陷波角以最小化或消除特定的不需要的谐波。
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8.发明授权Apparatus and method for transient free energization and deenergization of static VAR generators 失效用于静态VAR发生器的瞬态自由通电和断电的装置和方法
公开(公告)号：US4047097A
公开(公告)日：1977-09-06
申请号：US677202
申请日：1976-04-15
CPC分类号： H02J3/1864 , Y02E40/12
摘要： A static VAR generator is taught for use with a source of electrical power and a rapidly varying load. The static VAR generator comprises thyristor switched inductors connected across a capacitor. The gate of the thyristor switch is fired each half cycle in accordance with a predetermined firing angle to provide sufficient inductive current to cancel a portion of the capacitive current to thus provide a net reactive current for the system served. This is done on a half cycle by half cycle basis. A main disconnect switch is connected in parallel with the series combination of a secondary disconnect switch, a diode and a large resistor. The latter combination is connected in series with the parallel combination of the compensating inductor and the compensating capacitor. The secondary disconnect switch is utilized to charge the capacitor to the peak voltage between lines of the electrical system prior to connecting the static VAR generator to the system or prior to disconnecting the static VAR generator from the system. Prior to a disconnecting or connecting operation an oscillating current is introduced between the compensating capacitor and the compensating inductor. This current is found to have the same frequency phase, wave shape and amplitude as the voltage between the lines to which the static VAR generator is connected. The gate control for the thyristor is utilized to fix the phase difference between the oscillating current and the alternating voltage of the system at or near zero. The oscillating voltage caused by the oscillating current is thus equal in phase, frequency, wave shape and magnitude to the alternating voltage of the system. Consequently the main disconnect switch can be opened or closed as desired with zero electrical potential thereacross.
摘要翻译： 教导静态VAR发生器用于电源和快速变化的负载。 静态VAR发生器包括连接在电容器上的晶闸管开关电感器。 晶闸管开关的栅极根据预定的触发角度每半个周期被烧，以提供足够的感应电流来消除电容电流的一部分，从而为所服务的系统提供净无功电流。 这是以半个周期为基础进行的。 主断路开关与二次断路开关，二极管和大电阻的串联组合并联。 后者的组合与补偿电感器和补偿电容器的并联组合串联连接。 在将静态VAR发生器连接到系统之前或者在将静态VAR发生器从系统断开之前，二次断开开关用于将电容器充电到电气系统的线路之间的峰值电压。 在断开或连接操作之前，在补偿电容器和补偿电感器之间引入振荡电流。 发现该电流具有与静态VAR发生器连接的线路之间的电压相同的频率相位，波形和振幅。 晶闸管的栅极控制用于将系统的振荡电流和交流电压之间的相位差固定在零或接近零。 振荡电流产生的振荡电压在相位，频率，波形和幅度方面与系统的交流电压相等。 因此，主切断开关可根据需要打开或关闭，其中电位为零。
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公开(公告)号：US4398141A
公开(公告)日：1983-08-09
申请号：US303299
申请日：1981-09-15
CPC分类号： H02J3/1864 , Y02E40/12
摘要： There is provided by this invention a static VAR generator having an auxiliary shutdown firing pulse generator that initiates a thyristor controlled inductive current to cancel only capacitive current supplied by the static VAR generator in the event of failure of the VAR generator's control means monitoring the capacitive current requirements.
摘要翻译： 本发明提供一种具有辅助关断点火脉冲发生器的静态VAR发生器，其启动晶闸管控制的感应电流，以在VAR发生器的控制装置监测电容电流的故障的情况下仅抵消由静态VAR发生器提供的电容电流 要求。
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公开(公告)号：US4394614A
公开(公告)日：1983-07-19
申请号：US302349
申请日：1981-09-15
CPC分类号： H02J3/1864 , Y02E40/12
摘要： There is provided by this invention a static VAR generator having an auxiliary shutdown firing pulse generator that initiates a thyristor controlled inductive current to cancel any capacitive current supplied by the static VAR generator in the event of failure of the VAR generator's control means monitoring the capacitive current requirements.
摘要翻译： 本发明提供了一种静态VAR发生器，其具有辅助关断点火脉冲发生器，其启动晶闸管控制的感应电流以消除在VAR发生器的控制装置监测电容电流的故障的情况下由静态VAR发生器提供的任何电容电流 要求。
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