开关频率越高，其控制性能越好。
The higher the switching frequency is, the better the performance is.
首先就是开关频率。
SVPWM算法保证了逆变器的开关频率恒定。
它具有开关频率恒定，转矩和磁链波动小等特点。
It features in low torque ripple, low flux ripple and fixed switching frequency.
文中提出了一种新型的开关频率固定的转矩控制器。
In this paper a new torque controller with fixed switching frequency is proposed.
提出一种新颖的开关频率优化配置的PWM控制方案。
An optimized switching frequency PWM control strategy is presented in this paper.
电力通过以第一开关频率操作的至少一个开关供应到马达。
Power is provided to the motor through at least one switch operating at a first switching frequency.
主要研究适用于高开关频率变频器驱动的感应电动机数学模型。
Inductive motor mathematics model suitable for high switching frequency inverter drive is described in this paper.
保证过电流保护的同时，还提高了开关频率，减小了输出谐波。
The switch frequency is increased and the output harmonic is decreased while the overcurrent protection is ensured.
该装置采用多重化技术，成功的解决了容量和开关频率的矛盾。
With the multiplex technology, the contradiction between device capacity and switching frequency is solved successfully.
同时随机化零矢量，通过约束保证平均开关频率等于采样频率。
Zero vectors are randomized with the sample frequency and the average switching frequency equals to sample frequency with some constraint.
由于其开关频率高，易于串联，故适合在中电压大功率领域使用。
Because of its high switching frequency and easy series connection, it is suitable for medium voltage high power applications.
通过交错控制和提高开关频率，大大减小了变换器的体积和重量。
Moreover, the size and weight of the converter can also be reduced by interleaving technique and increasing the frequency.
但其存在浮动电容器的电压失配问题，尤其在低开关频率时尤为显著。
But the unbalance of the floating capacitor voltage can be a problem, especially at low switching frequencies.
为了克服滞环控制的不足，串联侧采用恒频滞环来保持开关频率的稳定。
The constant frequency hysteresis is adopted to keep switching frequency stable and improve the hysteretic control.
这个方法然后等待在连续当阶段性地被中断以渴望的PWM开关频率的圈。
This method then waits in a continuous while loop that is periodically interrupted at the desired PWM switching frequency.
它具有大电流、高电压、开关频率高、高可靠性、结构紧凑、低损耗的特点。
It has characteristics of large current, high power, high voltage, high switch frequency, proven reliability, low losses and so on.
辅助开关虽然流过大部分电流，但由于其开关频率低，因此开关损耗也不高。
The majority of the current pass the accessorial switch, but the switching frequency is low, so the switch consumption is not high.
传统的直接转矩控制存在着转矩脉动大，低速性能差、开关频率不固定等问题。
The traditional direct torque control system has existed large torque fluctuation, poor performance of low speed region, inconstant switch frequency, etc.
结果表明，该控制方案能在恒定开关频率下对变换器实现高效率的软开关控制。
The results show that this control scheme could realize the high efficiency soft-switch control under the constant switching frequency to the converter.
要提高开关频率可采用使开关损耗为零的方法，使之只受器件的固有参数限制。
Zero switching loss can be used to make it affected only by inherent characters of devices.
结果表明提出的控制器可以保持开关频率恒定，并降低了转矩脉动，尤其在低速时。
The results indicate that the proposed controller is capable of maintaining the torque switching frequency constant and reducing the torque ripple, particularly at low speed.
仿真结果表明：改进后系统使逆变器开关频率减小，损耗降低，转矩有明显的改善。
The simulation results show that the improved control system significantly reduces the torque ripple, current ripple and effectively decreases the inverter switching frequency.
以空间矢量调制方法来获得逆变器的开关信号，实现了小的转矩脉动和恒定的开关频率。
The control signals of invertor are produced by space vector modulation to achieve a small torque ripple and constant switch frequency.
在高压大容量应用场合，多电平逆变电路具有显着的优势，比如输出谐波少、开关频率低等。
In high voltage and high power fields, multilevel inverter has significant advantages, such as less distorted output, lower switching frequency, etc.
该电路具有既能将负载电流限制在设定值以内，又能控制限流工作时功率管的开关频率等特点。
This circuit has both characters of restricting the current within the giving value and limiting the switching frequency of MOSFET operating on current limited condition.
对空间电压矢量方法进行了改进，在不改变系统输出特性的前提下，使开关频率降低了50%。
Maintaining the output character of the system, the voltage space vector control was improved which made the switching frequency decrease 50%.
分析表明，采用合适电容值的低等效寄生电阻的滤波电容，并提高开关频率，可减小输出电压跌落。
The analyses show that using a low equivalent series resistance (ESR) capacitor with a carefully determined value and raising switching frequency can decrease output voltage fall.
采用滞环比较器的直接功率控制系统的开关频率不固定，是实用化过程中需要解决的一个技术问题。
The switch frequency of the direct power control system using hysteresis comparator is not fixed, which is a technical issue in practical needing be solved.
采用滞环比较器的直接功率控制系统的开关频率不固定，是实用化过程中需要解决的一个技术问题。
The switch frequency of the direct power control system using hysteresis comparator is not fixed, which is a technical issue in practical needing be solved.
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