JP2008005620A - Electric vehicle control device - Google Patents

Abstract

An electric vehicle control device capable of suppressing an unbalance of a main motor current of each control unit during light load regenerative control of the electric vehicle.
A plurality of control units 11a to 11n that control a main motor that drives an electric vehicle and have a power regeneration control function, and a central device 12 that performs train control and monitoring based on information from each control unit. When performing light load regenerative control that limits the current of the main motor by setting a limiter on the filter capacitor voltage value of the smoothing circuit of each control unit, the central unit inputs the main motor current flowing to each control unit and controls each control unit. The average value obtained by dividing the main motor current of the unit by the number of units is calculated and transmitted to each control unit, and each control unit uses the filter capacitor voltage so that the main motor current converges to the average value transmitted from the central unit. Correct.
[Selection] Figure 1

Description

  The present invention relates to a control device for an electric vehicle that performs control for narrowing a current of a main motor during light load regenerative control of the electric vehicle.

  In an electric vehicle control device having a power regeneration control function, power is regenerated for a load connected to the same train line, but if the power regenerated for that load is too large, the train line voltage is raised to increase the train line voltage. An abnormal condition may occur. Therefore, light load regenerative control is performed to reduce the regenerative power output to the train line when the power regenerative load is small and light. In such a light load regenerative control of an electric vehicle, a limiter is provided to the value of the filter capacitor voltage of the smoothing circuit of each control unit to control the current of the main motor. FIG. 3 is a relationship diagram between the main motor current IAn and the filter capacitor voltage EFC when the light load regeneration control is performed.

  When EFC1 (point B1) and EFC0 (point C) are set as limiters for the filter capacitor voltage EFC, when the filter capacitor voltage EFC reaches EFC1 (point B1), the main motor current IAn begins to decrease. When the filter capacitor voltage EFC becomes EFC0 (C point), the main motor current IAn is controlled to zero. Similarly, when EFC2 (point B2) and EFC0 (point C) are set as limiters for the filter capacitor voltage EFC, when the filter capacitor voltage EFC becomes EFC2 (point B2), the main motor current IAn is The main motor current IAn is controlled to 0 when the filter capacitor voltage EFC reaches EFC0 (point C).

  When the difference voltage of the limiter with respect to the filter capacitor voltage EFC is large, even if there is some detection error of the filter capacitor voltage EFC, the main motor current IAn is not greatly imbalanced, but the difference voltage of the limiter with respect to the filter capacitor voltage EFC Is large, an imbalance occurs in the main motor current IAn between the control units due to the detection error of the filter capacitor voltage EFC. In recent years, the voltage difference of the limiter with respect to the filter capacitor voltage EFC is made as small as possible, and a regenerative current is actively sent even to a distant regenerative load. Therefore, the unbalance of the main motor current IAn of each control unit is large.

  Therefore, in order to solve this problem, it is noted that the filter capacitor voltage EFC is the same value in each control unit when the electric vehicle is coasting, and the filter capacitor voltage EFC detected by each control unit 11a to 11n is corrected. ing. That is, as shown in FIG. 4, each control unit 11 a to 11 n has an inverter that drives the main motor, and the values EA <b> 1 to EA <b> 1 of the filter capacitor voltage EFC during coasting of the electric vehicle detected by each control unit 11 a to 11 n are detected. EAn is transmitted to the central device 12, and the central control device 12 calculates the average voltage value EAave by dividing the sum of the filter capacitor voltage values EA1 to EAn of the control units 11a to 11n by the number of units, and each control unit 11a. Return to ~ 11n. As a result, the detection error of the filter capacitor voltage EFC is corrected, and the filter capacitor voltages EFC of the control units 11a to 11n are made uniform. The corrected filter capacitor voltage EFC is used for light load regenerative control so that the main motor current IAn becomes the same.

Here, in the high voltage control during the regenerative operation, a single main control device is provided separately from the multiple group control devices that control the one-unit vehicle, and the high voltage of the multiple group control devices is provided by the main control device. Some control start voltages are individually adjusted so that all control devices perform high-voltage control at the same time, and control imbalance that occurs between a plurality of control devices that control a single vehicle is controlled. (For example, refer to Patent Document 1).
JP 2001-157303 A

  However, in the conventional apparatus, the detection error of the filter capacitor voltage EFC of each control unit at the time of light load regenerative control is corrected to remove the factor that unbalances the main motor current IAn of each control unit. Since the control units do not always move along the characteristic line of the light load regenerative control, the imbalance of the main motor current IAn of each control unit may not be corrected. That is, since the control for matching the main motor current IAn to IAave which is an average value is performed in an open loop, the main motor current IAn of each control unit may not be matched. Further, when the characteristics of the light load regenerative control are different (for example, in the case of a combined train of different models), imbalance occurs.

  If an imbalance occurs in the main motor current between the units due to the detection error of the filter capacitor voltage, this results in an imbalance of the air brake amount that is supplemented to keep the braking force constant, resulting in an unbalanced amount of wear on the brake wheel. Balance arises. From the standpoint of maintenance, it is desirable that the amount of wear of the brakes be equalized.

  The objective of this invention is providing the control apparatus of the electric vehicle which can suppress the imbalance of the main motor current of each control unit at the time of light load regenerative control of an electric vehicle.

  An electric vehicle control device according to the present invention includes a plurality of control units that control a main motor that drives an electric vehicle and have a power regeneration control function, and a central device that performs train control and monitoring based on information from each control unit; An electric vehicle control device for limiting the current of the main motor by providing a limiter to the value of the filter capacitor voltage of the smoothing circuit of each control unit during light load regenerative control of the electric vehicle. In the light load regenerative control, the main motor current flowing through each control unit is input, and an average value obtained by dividing the main motor current of each control unit by the number of units is calculated and transmitted to each control unit. The filter capacitor voltage is corrected so that the main motor current converges to the average value transmitted from the central device.

  ADVANTAGE OF THE INVENTION According to this invention, the imbalance of the main motor current of each control unit can be suppressed at the time of light load regenerative control of an electric vehicle.

  Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram of an electric vehicle control apparatus according to an embodiment of the present invention. Each of the control units 11a to 11n has an inverter and controls a main motor that drives an electric vehicle and has a power regeneration control function. Moreover, the central apparatus 12 performs train control and monitoring based on the information from each control unit 11a-11n. Each control unit 11a to 11n detects the filter capacitor voltage of the smoothing circuit of each control unit 11a to 11n during light load regenerative control of the electric vehicle, and provides a limiter to the filter capacitor voltage to supply the current of the main motor. Perform light load regenerative control to narrow down.

  In that case, each control unit 11a-11n transmits the electric current IA1-IAn which flows into each control unit 11a-11n to the central apparatus 12. FIG. When the central device 12 receives the currents IA1 to IAn of the control units 11a to 11n, the central device 12 calculates an average value IAave obtained by dividing the sum of the currents IA1 to IAn of the control units 11a to 11n by the number of units, and then calculates the control units 11a to 11n. 11n.

  Each control unit 11a to 11n uses the value obtained by calculation of EFC = EFCreal + K (IAn−IAave) as the filter capacitor voltage EFC used for light load regenerative control, and corrects the filter capacitor voltage EFC. Here, EFCreal is a detected value of the filter capacitor voltage, IAn is the main motor current, IAave is an average value, and K is a predetermined coefficient.

  FIG. 2 is a relationship diagram between the main motor current IAn and the filter capacitor voltage EFC when the light load regenerative control is performed in the embodiment of the present invention. When the filter capacitor voltage EFC obtained by the correction becomes a value equal to or higher than Vr, the light load regeneration mode is determined, and when the filter capacitor voltage EFC becomes V0, the light load regeneration is started. Further, the filter capacitor voltage FEC to be corrected is a limiter that increases or decreases ± several% of the detection value EFCreal of the filter capacitor voltage.

  As a result, the feedback control of the closed loop is performed so that the main motor current IAn of each control unit 11a to 11n flows the current of the average value IAave. That is, when IAn> IAave, the filter capacitor voltage EFC is corrected to be positive. When this positively corrected filter capacitor voltage EFC is input to the control element of the light load regenerative control, the main motor current IAn decreases and approaches the average value IAave. This approaching degree depends on the coefficient K. Further, the feedback control for adjusting the filter capacitor voltage EFC with respect to the average value IAave is set so as to move in a control loop of 1 second or more in terms of time.

  By always acting in the light load regeneration mode in this way, the main motor current of each control unit can be made as close to IAave as possible, and the amount of air brake supplemented by each control unit can be made almost the same value. it can.

  According to the embodiment of the present invention, the amount and opportunity of the air brake acting on each control unit 11a to 11n are equalized, so that the wear of the control wheel proceeds simultaneously in each control unit and requires replacement. At the right time, the control unit 11a to 11n has a favorable result for the maintenance that the control device has reached the same amount of wear.

The block diagram of the control apparatus of the electric vehicle concerning embodiment of this invention. The relationship figure of the main motor current and filter capacitor voltage in the case of performing light load regeneration control in an embodiment of the invention. The relationship figure of the main motor current and filter capacitor voltage in the case of performing the conventional light load regenerative control. The block diagram of the control apparatus of the conventional electric vehicle.

Explanation of symbols

11 ... Control unit, 12 ... Central device

Claims (2)

  Light load regenerative control of an electric vehicle comprising a plurality of control units that control a main motor that drives an electric vehicle and having a power regeneration control function, and a central device that performs train control and monitoring based on information from each control unit In the electric vehicle control device for limiting the current of the main motor by providing a limiter to the filter capacitor voltage value of the smoothing circuit of each control unit at the time, the central device controls each control in the light load regenerative control of the electric vehicle. The main motor current flowing into the unit is input, the average value obtained by dividing the main motor current of each control unit by the number of units is calculated and transmitted to each control unit, and the main motor current is transmitted from the central unit to each control unit. A control device for an electric vehicle, wherein the filter capacitor voltage is corrected so as to converge to an average value. Each control unit has a filter capacitor voltage detection value of EFCreal, a main motor current of IAn, an average value of IAave, and a predetermined coefficient of K. The filter capacitor voltage EFC input to the light load regenerative limiter control is converted to EFC The electric vehicle control device according to claim 1, wherein correction of EFCreal + K (IAn−IAave) is performed.

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