rectifier block什么意思及同义词

英语翻译
THE THREE-PHASE PWM rectifier is increasingly used
for industrial applications since it has advantages such as
constant dc voltage control,sinusoidal line current control,unity
power factor control,and bi-directional power flow [1].For
normal operation,it basically requires three kinds of sensors for
detecting ac voltages,ac currents and dc voltage.A dc voltage
sensor is demanded for the dc voltage feedback control and
excessive voltage protection.The two ac voltage sensors are
needed to detect the phase angle of the source voltage,which
is taken as a reference frame of the controller,and thus to perform
input power factor control.The two line current sensors are
required for the input current control for boosting action and excessive
current protection.
Using all of these sensors makes the system bulky and expensive.
In addition,the sensing signal is usually subject to the noise
and furthermore incidental missing of the signal may deteriorate
the system reliability.Therefore,it is desirable to reduce the
number of sensors as far as possible.A few research results have
been reported to eliminate either source voltage sensors [2]–[4]
or line current sensors [5]–[8].However,no method eliminating
both of them has been yet presented as far as authors know.
In this paper,a novel method to eliminate both ac voltage and
current sensors is proposed,which uses only the dc-side sensors.
The phase angle and the magnitude of the source voltage are estimated
by controlling the deviation between the rectifier currentand its model current to be zero.On the other hand,the line currents
are reconstructed using the measured dc output currents
and the switching states of the PWM rectifier.To eliminate the
calculation time delay effect of the DSP,the line currents ahead
one sampling period are estimated by a state observer,and then
the predicted currents are used for feedback control.
The validity of the proposed ac sensorless technique has been
verified through experimental results for 1.5 [kVA] IGBTPWM
rectifier system controlled by a DSP TMS320C31.