Motor control system and vehicle having same

Abstract

The invention discloses a motor control system and a vehicle having the same. The motor control system includes a power supply, wherein one end of the power supply is connected to a positive direct current bus, and the other end of the power supply is connected to a negative direct current bus; a plurality of motors; and a plurality of motor drive controllers which are successively connected in series are connected between the positive direct current bus and the negative direct current bus, the plurality of motor drive controllers are correspondingly connected to the plurality of motors, and each motor drive controller is used for driving the corresponding motor. In this way, the input voltage of each motor drive controller is reduced, the withstand voltage of each motor drive controller is reduced, the switching speed is improved, and the cost is effectively reduced; and each motor drive controller adopts two level drives, the stability and the reliability of the system can be ensured, and the control algorithm and a circuit structure are simple.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a motor control system and a vehicle. Background technique [0002] In the related dual electric drive system, the high-voltage power grid is stepped down and rectified to output high-voltage direct current, which is then supplied to the two motor drive controllers respectively. Thus, each motor drive controller independently takes power from the high-voltage direct current and inverts it into three-phase alternating current, and then supplies the three-phase alternating current to the corresponding motor, so as to drive the whole vehicle through the corresponding motor. Among them, the voltage level of high-voltage direct current is usually 750V and 1500V, and the topology of the motor drive controller usually adopts such as figure 1 The two-level drive inverter bridge shown and as figure 2 The three-level drive inverter bridge shown. [0003] However, the related technolog...

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Problems solved by technology

[0003] However, the related technology has the following problems, when adopting such as figure 1 When driving the inverter bridge with two levels as shown, it is necessary to use a switching tube with a higher withstand voltage. For example, the corresponding withstand voltage level of the switching tube must reach 1700V / 3300V, which will result in a larger power of the switching tube and a slower switching speed. The main power components such as filter inductors and transformers have large volume, weight and high cost; when such as figure 2 When the inverter bridge is driven by the three levels shown, although the corresponding withstand voltage of the switching tube can be halved, for example, 1200V and 1700V, but the control algorithm, driving and power supply circuits will be much more complicated, making the system stability worse

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