区域间低频振荡的可能性和危害性日益增加,严重威胁着电网的安全稳定,为此,阐述电力系统稳定器(power system stabilizer,PSS)各环节抑制低频振荡的原理。建立电力系统模型,以系统模型为基础对发电机励磁系统与电力系统的低频振荡之间...区域间低频振荡的可能性和危害性日益增加,严重威胁着电网的安全稳定,为此,阐述电力系统稳定器(power system stabilizer,PSS)各环节抑制低频振荡的原理。建立电力系统模型,以系统模型为基础对发电机励磁系统与电力系统的低频振荡之间的关系进行分析,利用相位补偿法对PSS进行参数设计;利用MATLAB程序对2区4机电力系统进行单机分别配置PSS参数;利用改进的粒子群算法配置PSS参数进行协调控制。通过仿真计算,验证了利用改进的粒子群算法协调配置PSS参数对抑制系统低频振荡的效果比单机分别配置更好。展开更多
A vehicle stopping method using an electric brake until a traction motor is stopped is studied. At the moment of vehicle stop, electric brake is changed to control mode where torque is reduced at a low speed. Gradient...A vehicle stopping method using an electric brake until a traction motor is stopped is studied. At the moment of vehicle stop, electric brake is changed to control mode where torque is reduced at a low speed. Gradient is controlled by estimating the load torque of motor, thereby traction motor is not rotated after stop. In addition, coasting operation and brake test are performed from normal-opposite operation and start using a small-scale model comprising the inertial load equipment and the power converter. Further, traction motor is made to be equipped with a suspension torque. Pure electric braking that makes traction motor stop by an air brake at the time of stop is also implemented. Constant torque range and constant power range are expanded during braking so that braking force is secured with the electric brakes even in high speed region. Therefore, vehicle reduction effect can be expected by reducing parts related with an air brake which is not used frequently by using a pure electric brake in the M car in wide speed region. Further, maintenance of brake system can be reduced. Besides, ride comfort of passenger in the electric rail car, energy efficiency improvement, and noise reduction effect can be additionally expected. Further, an improved brake method that uses only an electric brake till motor stop is proposed by comparing those in the blending brake that uses an air brake while reducing brake torque at vehicle stop.展开更多
文摘区域间低频振荡的可能性和危害性日益增加,严重威胁着电网的安全稳定,为此,阐述电力系统稳定器(power system stabilizer,PSS)各环节抑制低频振荡的原理。建立电力系统模型,以系统模型为基础对发电机励磁系统与电力系统的低频振荡之间的关系进行分析,利用相位补偿法对PSS进行参数设计;利用MATLAB程序对2区4机电力系统进行单机分别配置PSS参数;利用改进的粒子群算法配置PSS参数进行协调控制。通过仿真计算,验证了利用改进的粒子群算法协调配置PSS参数对抑制系统低频振荡的效果比单机分别配置更好。
文摘A vehicle stopping method using an electric brake until a traction motor is stopped is studied. At the moment of vehicle stop, electric brake is changed to control mode where torque is reduced at a low speed. Gradient is controlled by estimating the load torque of motor, thereby traction motor is not rotated after stop. In addition, coasting operation and brake test are performed from normal-opposite operation and start using a small-scale model comprising the inertial load equipment and the power converter. Further, traction motor is made to be equipped with a suspension torque. Pure electric braking that makes traction motor stop by an air brake at the time of stop is also implemented. Constant torque range and constant power range are expanded during braking so that braking force is secured with the electric brakes even in high speed region. Therefore, vehicle reduction effect can be expected by reducing parts related with an air brake which is not used frequently by using a pure electric brake in the M car in wide speed region. Further, maintenance of brake system can be reduced. Besides, ride comfort of passenger in the electric rail car, energy efficiency improvement, and noise reduction effect can be additionally expected. Further, an improved brake method that uses only an electric brake till motor stop is proposed by comparing those in the blending brake that uses an air brake while reducing brake torque at vehicle stop.
