JPH06217401A - Power supply controller for electric vehicle - Google Patents

Abstract

PURPOSE:To prevent flicker of fluorescent lamp by correcting the phase lag of sine waveform to be detected by an output voltage detecting means thereby obtaining an output voltage waveform and then determining the reference point of sinusoidal output voltage from a power supply based on a zero-cross point. CONSTITUTION:Output voltage 11 from a power supply is detected by a sinusoidal output voltage detector 12 and the phase lag thereof is corrected by a corrector 14 thus producing an output 15. A detecting section 16 detects a zero-cross of the output voltage 15 and a reference sine wave generator 18 generates a reference sine wave 19. A command value 22 from an output voltage command controller 21 is multiplied 23 by the reference sine wave 19 and added to a phase corrected output 15 thus obtaining a difference 26 which is then fed to a feedback controller 27 where a predetermined phase command 28 is determined. The phase command 28 is fed to a converter 29 of inverter constitution and the output voltage 11 therefrom is employed as the power supply for a fluorescent lamp. This constitution prevents flicker of fluorescent lamp effectively even when a compressor in an electric vehicle operates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control device for an electric vehicle.

[0002]

2. Description of the Related Art Generally, a power supply device 1 for an electric vehicle that receives power from an overhead line or a third rail receives power from a overhead wire 2 or a third rail via a pantograph 3 as shown in FIG. The electric power is supplied to the air conditioner 4 as a load for converting the electric power, the compressor 5 for compressing the air used for controlling the electric vehicle, the fluorescent lamp 6 used for lighting in the vehicle, and the control device 7. As a configuration of the power supply control device provided inside the power supply device 1, a configuration shown in FIG. 7 is conventionally known.

In this conventional electric vehicle power supply control device, a voltage command 102 is applied by a voltage command device 103 so that a predetermined voltage can be obtained as an output voltage 101 of the power supply device, and an adder 104 controls this voltage command device 103. A voltage deviation 105 between the voltage command 102 and the output voltage 101 is calculated, and a feedback controller 106 calculates a feedback correction value 107 from the voltage deviation 105. On the other hand, from the voltage 108 of the filter capacitor 1a which is the input voltage of the power supply device 1 shown in FIG. 2, the feedforward controller 109 determines the feedforward command value 110 which commands the output voltage with respect to the input voltage. The adder 111 adds the feedback correction value 107, which is the output of the feedback controller 106, and the feedforward command value 110, which is the output of the feedforward controller 109, to obtain the phase command 112, which is formed by an inverter. The converter 113 outputs a predetermined output voltage 101 by inputting the input voltage to the converter 113.

By the way, in such a power supply control device for an electric vehicle, since the power supply device 1 is supplied with power from the overhead line 2 through the pantograph 3, it is affected by other electric vehicles running in the same feeding section. Further, the power supply voltage to be input may be large and fluctuate sharply due to the influence of the main circuit for driving the own vehicle, the influence of the contact state between the overhead wire 2 and the pantograph 3, and the like. It is required to output electric power of a stable voltage even when the input voltage of the power supply device fluctuates.

On the other hand, as described above, various loads are connected as the load of the power supply device 1. Especially, the load of the compressor 5 has a pulsation of several hertz, and the load capacity itself of the compressor 5 is also large. In addition, the output voltage 10 of the power supply device 1
It is unavoidable that 1 fluctuates under the influence of the load of the compressor 5 and ripples are overlapped, which affects the fluorescent lamp 6 and causes flickering (flickering), which impairs passenger comfort. There was a risk that the service would deteriorate.

[0006]

However, in the conventional electric power source control device for an electric vehicle, it is possible to prevent a problem by the feedback control and the feedforward control with respect to the fluctuation of the input voltage and the transient fluctuation of the load. However, it cannot respond effectively to the pulsation of several hertz and the waveform distortion of the sine wave of the output voltage such as the load of the compressor as described above, and as shown in FIG. The output voltage waveform has a ripple component 114 superimposed on the output voltage 101, and as shown in FIG. 9, the output voltage 101 remains distorted as shown by the solid line in contrast to the regular output waveform 101 'shown by the broken line. However, this causes a flicker phenomenon in the fluorescent lamp, which impairs the riding comfort of passengers.

The present invention has been made in view of the above-mentioned conventional problems, and a stable output voltage is obtained with respect to a fluctuation of an input voltage and a transient fluctuation of a load, and a waveform of the output voltage is generated even when a compressor is in operation. It is an object of the present invention to provide a power supply control device for an electric vehicle that does not cause distortion and prevents ripples from being superimposed on the output voltage, does not cause a flicker phenomenon in a fluorescent lamp, and avoids deterioration in passenger comfort. And

[0008]

SUMMARY OF THE INVENTION A power supply control device for an electric vehicle according to the present invention includes a converter for giving a predetermined output voltage in response to an input phase command, and an output voltage detection for detecting the output voltage of the converter. Means, a phase correction means for correcting the phase of the output voltage, and a reference point of the corrected output voltage waveform in order to generate a sine wave reference waveform from the output voltage waveform corrected by the phase correction means. Zero-cross detection means, sine wave generation means for generating a sine wave with the zero-cross point detected by the zero-cross detection means as a reference, voltage command means for giving an output voltage command of the power supply device, and sine wave of the sine wave generation means. Multiplying means for multiplying the output voltage command of the voltage commanding means to obtain the reference voltage sine wave command, the output voltage phase-corrected by the phase correcting means, and the reference voltage sine wave command from the multiplying means. Adding means for obtaining the deviation by inputting the differential output from the adding means, in which a feedback control means for determining a phase command for controlling the output voltage of the converter.

[0009]

In the electric vehicle power supply control device of the present invention, the sinusoidal waveform of the output voltage detected by the output voltage detecting means is obtained, and the phase is corrected from the sinusoidal waveform of the output voltage by the phase correcting means. , An output voltage sine wave in which the detection delay time of the detection means is corrected is obtained. Then, the reference point of the output voltage sine wave to be output by the power supply device is detected from the output voltage sine wave whose detection delay time is corrected by the zero-cross detection means to obtain the phase reference point of the sine wave, and the sine wave generation means supplies the power. Find the sine wave that is the reference for the output voltage that the device should output.

Next, the sine wave serving as the reference of the output voltage to be output and the voltage command value to be output by the power supply device are multiplied by the multiplying means to obtain the sine wave of the voltage command value of the output voltage.

Then, the deviation between the sine wave of the voltage command value of the output voltage and the output voltage sine wave whose phase is corrected by the phase correcting means is obtained by the adding means, and the phase command for correcting the deviation is obtained by the feedback control means. Calculate and apply this to the converter so that the output voltage is kept sinusoidal.

In this way, even if the sine wave of the output voltage is distorted by a load such as a compressor, the deviation from the sine wave of the voltage command to be output from the power supply device is calculated and corrected, and the output voltage is always kept as a sine wave. Also, for ripples of several hertz, by performing feedback control by comparing with the voltage command value to be output, the ripple component is corrected by the deviation,
The superposition of pulsation that causes a flicker phenomenon in a fluorescent lamp on the output voltage is prevented.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a circuit block diagram of an embodiment of the present invention. The electric vehicle power source control device of this embodiment is shown in FIG.
The output voltage detector 12 for detecting the output voltage 11 of the power supply device 1 with a sine wave, and the output voltage detection value 13 detected by the output voltage detector 12 Phase compensator 14 for compensating for the detection delay time of, the zero-cross detector 16 for obtaining the phase of the reference sine wave from the output voltage 15 whose phase is corrected by the phase compensator 14, and the zero-cross reference value obtained by this zero-cross detector 16. A reference sine wave generator 18 for generating a reference sine wave 19 on the basis of 17 is provided.

The power supply control device also includes an output voltage command value controller 21 for controlling an output voltage command value 22 to be output from a voltage 20 across the filter capacitor 1a which supplies the input voltage of the power supply device 1, and a reference sine wave generator 18. A multiplier 23 that multiplies the reference sine wave 19 from the output voltage command value controller 22 with the output voltage command value 22 and outputs the output voltage command sine wave 24 is provided.

The power supply controller further adds an adder 25 for obtaining a deviation 26 between the output voltage command sine wave 24 from the multiplier 23 and the corrected output voltage 15 from the phase corrector 14 to the deviation 26 from the adder 25. On the other hand, a feedback controller 27 for obtaining a predetermined phase command 28, and a converter 29 composed of an inverter for obtaining a predetermined output voltage 11 with respect to the phase command 28 from the feedback controller 27.
Is equipped with. Next, the operation of the electric vehicle power supply control device having the above-described configuration will be described.

The output voltage detector 12 takes in the output voltage 11 of the converter 28 as the output voltage of the power supply device 1 shown in FIG. 2 and outputs the output voltage sine wave 13 as shown in FIG. 3 (a).
Ask for. Furthermore, for this output voltage sine wave 13,
Due to the detection time delay and the configuration of the main circuit, a phase difference is generated between the detected output voltage 13 and the output voltage 13 'to be commanded as shown in FIG. The phase is corrected to obtain the corrected output voltage 15 as shown in FIG.

Next, the zero-cross detector 16 determines the reference point of the sine wave that the power supply device 1 should originally output from the corrected output voltage 15. The zero-cross reference value 17 obtained by the zero-cross detector 16 is "H" when the output voltage is (+) and "L" when the output voltage is (-), as shown in FIG. 3C.

The reference sine wave generator 18 is used for the zero-cross reference value 17 thus obtained by the zero-cross detector 16.
Outputs to the multiplier 23 the reference sine wave 19 as shown in FIG.

In the output voltage command controller 21,
Filter capacitor voltage 2 which is the input voltage of the power supply device 1
The command value 22 of the output voltage is obtained from 0 and output to the multiplier 23. The output voltage command value 22 is usually a constant value, but when the input voltage changes suddenly, such as the disconnection peculiar to an electric vehicle, a value controlled by the output voltage command value controller 21 by software is given. . That is, FIG.
As shown in (a), for example, if the input voltage 20 drops due to disconnection and falls below the performance guarantee voltage range A, (b) in the same figure.
As shown in, even if the output voltage command value 22 is lowered and the pantograph 3 is reattached and the input voltage 20 suddenly rises, the command value 2
2 is controlled so as to increase by the amount of decrease so far.

The multiplier 23 multiplies the reference sine wave 19 and the output voltage command value 22 to obtain the output voltage command sine wave 24 shown in FIG. Then, as shown in FIG. 6A, control is performed by the adder 25 from the corrected output voltage 15 detected after the phase correction of the power supply device 1 and the output voltage command sine wave 24 that becomes the output voltage command value of the power supply device 1. The deviation 26, which is a quantity, is obtained, and this is used as the feedback controller 2
Type in 7.

In the feedback controller 27 which outputs the phase command 28 to the converter 29, as shown in FIG. 6B, when the output voltage 15 detected and phase-corrected with respect to the output voltage command sine wave 24 is small. Is the calculated deviation 26
The phase command 28 is increased to control the actual output voltage 11 to increase, and conversely, the output voltage command sine wave 2
When the detected and phase-corrected output voltage 15 with respect to 4 increases, the phase command 28 is decreased from the calculated deviation 26 to control the actual output voltage 11 to decrease.

In this way, in the electric vehicle power source control device of this embodiment, the phase command 28 is controlled in accordance with the deviation between the corrected output voltage 15 and the output voltage command sine wave 24, so that the frequency range of several hertz. It is possible to control so as to suppress ripple fluctuation of several tens of hertz and distortion of output voltage. Therefore, not only can the power supply be controlled stably during operation of the compressor, but also the output voltage can be made more stable against transient fluctuations when starting various loads of the power supply and transient fluctuations when the pantograph is disconnected. ,
It is possible to suppress the flicker phenomenon of the fluorescent lamp, which has been caused by the ripple component of several hertz to several tens of hertz which has been superimposed on the output voltage and the distortion of the output voltage sine wave.

[0024]

As described above, according to the present invention, the sinusoidal waveform of the output voltage of the power supply device is obtained, and the phase is corrected from the sinusoidal waveform of the output voltage to detect the detection delay time of the detecting means. Is obtained, the reference point of the output voltage sine wave to be output by the power supply device is obtained from the output voltage sine wave with the detection delay time corrected, and this reference point is used as the phase reference point of the sine wave. The sine wave that is the reference of the output voltage to be output is generated, and the sine wave that is the reference of the output voltage to be output is multiplied by the voltage command value to be output by the power supply device to obtain the voltage of the output voltage. The sine wave of the command value is obtained, and further, the deviation between the sine wave of the voltage command value of this output voltage and the output voltage sine wave of the above-mentioned phase correction is calculated, and the phase command for correcting this deviation is fed to the feedback control means. Yo Since it is calculated and applied to the converter, the output voltage can be controlled by giving a phase command to the converter so that the output voltage waveform is a sine wave at all times. Even if the wave is distorted by a load such as a compressor, the deviation from the sine wave of the voltage command that the power supply should output can be calculated and corrected to keep the output voltage always a sine wave. Also, by performing feedback control in comparison with the voltage command value to be output, it is possible to correct the ripple component by the deviation and prevent the pulsation from superimposing on the output voltage, which causes a flicker phenomenon in the fluorescent lamp, Services can be improved without impairing passenger comfort.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of an embodiment of the present invention.

FIG. 2 is a circuit block diagram of a general electric vehicle power supply device.

FIG. 3 is a timing chart showing the operation of each of the output voltage detector, the phase corrector, the zero-cross detector, and the reference sine wave generator of the above embodiment.

FIG. 4 is a timing chart showing the operation of the output voltage command controller of the above embodiment.

FIG. 5 is a timing chart showing the operation of the multiplier of the above embodiment.

FIG. 6 is a timing chart showing the operation of each of the adder and the feedback controller of the above embodiment.

FIG. 7 is a circuit block diagram of a conventional example.

FIG. 8 is an explanatory diagram showing a phenomenon in which a ripple component due to a load is superimposed on an output voltage in a general power supply device.

FIG. 9 is an explanatory diagram showing a phenomenon of waveform distortion occurring due to a compressor load of an output voltage.

[Explanation of symbols]

 1 Power Supply Device 1a Filter Capacitor 11 Output Voltage 12 Output Voltage Detector 13 Output Voltage Detection Value 14 Phase Corrector 15 Corrected Output Voltage 16 Zero Cross Detector 17 Zero Cross Reference Value 18 Reference Sine Wave Generator 19 Reference Sine Wave 20 Filter Capacitor Voltage 21 Output voltage command controller 22 Output voltage command value 23 Multiplier 24 Output voltage command sine wave 25 Adder 26 Deviation 27 Feedback controller 28 Phase command 29 Converter

Claims (1)

[Claims] 1. A converter for giving a predetermined output voltage in response to an input phase command, an output voltage detecting means for detecting the output voltage of the converter, and a phase correcting means for correcting the phase of the output voltage. A zero-crossing detecting unit that detects a reference point of the corrected output voltage waveform in order to generate a reference waveform of a sine wave from the output voltage waveform that is phase-corrected by the phase correcting unit; Sine wave generating means for generating a sine wave with a zero-cross point as a reference, voltage command means for giving an output voltage command of the power supply device, and sine wave of the sine wave generating means and output voltage command of the voltage command means are multiplied. And a reference voltage sine wave command, and a deviation between the output voltage phase-corrected by the phase correction unit and the reference voltage sine wave command from the multiplication unit. Adding means, wherein by entering the differential output from the adding means, electric vehicle power control device comprising a feedback control means for determining a phase command for controlling the output voltage of the converter.