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    • 33. 发明授权
    • Control equipment for an active filter
    • 有源滤波器的控制设备
    • US5999422A
    • 1999-12-07
    • US155890
    • 1998-12-28
    • Tor GoranssonHenrik NilssonAnders berg
    • Tor GoranssonHenrik NilssonAnders berg
    • H02J1/02H02J3/01H02J3/36H02M1/15H02M7/06H02M1/14H02H7/00
    • H02J3/36Y02E60/60
    • An active filter (2) is connected to a dc circuit (L1, L2) in a converter (SR1) in an installation for transmission of high-voltage direct current. Control equipment (5) generates, in dependence on a control signal, a control order (SCF) for the active filter which, in dependence thereon, generates and supplies to the dc connection one of a filter voltage (UF) and a filter current (IF) for reducing at least one tone of a chosen tone frequency in a current (Id) in the dc connection. The control equipment comprises a controlling unit which forms a controller signal in dependence on a supplied current measurement value (IM) of the current in the dc connection, and an identification unit. The identification unit forms a first compensating parameter in dependence on the current measurement value and on an excitation signal generated by the control equipment and added to the control order. The control equipment forms the control signal in dependence on the controlling signal and the compensating parameter, which has been formed such that the sum thereof and of the phase shift for a transfer function from the control signal to the current measurement value at the chosen tone frequency is at least approximately equal to a preselected value.
    • PCT No.PCT / SE98 / 00421 Sec。 371日期1998年12月28日第 102(e)1998年12月28日PCT PCT 1998年3月10日PCT公布。 第WO98 / 21924号公报 日期1998年5月28日在高压直流传输装置中,有源滤波器(2)连接到转换器(SR1)中的直流电路(L1,L2)。 控制设备(5)根据控制信号产生用于有源滤波器的控制顺序(SCF),所述有源滤波器根据其生成并向滤波器电压(UF)和滤波器电流(UF) IF),用于在直流连接中的当前(Id)中减少所选音调频率的至少一个音调。 控制装置包括控制单元,该控制单元根据直流连接中的电流的供给电流测量值(IM)和识别单元形成控制器信号。 识别单元根据当前测量值和由控制设备产生的激励信号,并根据控制顺序形成第一补偿参数。 控制装置根据控制信号和补偿参数形成控制信号,所述控制信号和补偿参数被形成为使得其与所选音调频率之间的从控制信号到当前测量值的传递函数的相移和相移 至少近似等于预选值。