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您现在的位置:调速器介绍
调速器介绍

SWS-k型智能调速系统:
 

1、无刷双馈电机调速控制系统的结构和工作原理

 

本无刷双馈电机调速控制系统主要包括;无刷双馈电机、互为备份的三相全控型PWM变流器、三相不可控整流器及用于控制三个变流器通断的开关。调速系统正常工作时由三相不可控整流器和一个三相全控型PWM变流器形成调速系统;当三相全控型PWM变流器发生故障时,由处于冗余状态的三相全控型PWM变流器取代故障状态的三相全控型PWM变流器,确保系统的高可靠性运行。当调速系统需要运行在四象限状态时,由两个三相全控型PWM变流器形成背靠背式PWM变流装置。
                                          

工作原理图

 

本系统的结构特征是:三相电网与无刷双馈电机的功率绕组相连;三相全控型PWM变流器1和三相全控型PWM变流器2的直流侧均与直流母线电容7并联;直流母线电容与直流开关7的输出侧并联;直流开关7的输入侧与三相不可控整流器3的直流侧相连;三相不可控整流器3的交流侧与交流开关8的输出侧相连;交流开关6的输出侧与三相全控型PWM变流器2的交流侧相连;交流开关6和交流开关8的输入侧与三相变压器10的副边相连,三相变压器10的原边与三相电网相连;三相全控型PWM变流器2的交流侧与交流开关5的输出侧相连;交流开关5的输入侧与无刷双馈电机的控制绕组相连;交流开关5的输入侧与交流开关4的输入侧相连;交流开关4的输出与三相全控型PWM变流器1的交流侧相连。

调速系统正常工作时,三相不可控整流器3、直流母线电容9和三相全控型PWM变流器1投入运行,此时交流开关8、直流开关7和交流开关4闭合,交流开关5和交流开关6断开。

当三相全控型PWM变流器1发生故障退出运行时,由处于冗余状态的三相全控型PWM变流器2投入运行,此时交流开关8、直流开关7和交流开关5闭合,交流开关4和交流开关6断开。

当调速系统需要运行在四象限状态时,由三相全控型PWM变流器1、直流母线电容9和三相全控型PWM变流器2形成背靠背式PWM变流装置。

当三相电压与整流器3、三相全控型PWM变流器1和三相全控型PWM变流器2的电压相匹配时,交流开关6和交流开关8的输入侧可直接与三相电网相连。

通过控制三相全控型PWM变流器1或三相全控型PWM变流器2输出电压的幅值、频率和相位,使其跟踪无刷双馈电机的控制绕组端电压相匹配,从而实现无冲击启动。


2、系统研制的技术背景及解决方案

由于无刷双馈电机不存在电刷和滑环的维护问题,使得其工作寿命远比与其配套的三相全控型PWM变流器工作寿命长,一旦变流器中某一功率器件发生故障,系统必然发生突发性停机,很难实现调速系统的高可靠性运行。

鉴于上述现有技术的不足之处,本研发的目的在于提供一种可柔性运行的冗余型无刷双馈电机调速系统,当调速系统正常工作时由三相不可控整流器和一个三相全控型PWM变流器形成调速系统;当三相全控型PWM变流器发生故障时,由处于冗余状态的三相全控型PWM变流器取代故障状态的三相全控型PWM变流器投入运行,确保系统的高可靠性,特别是确保中高压无刷双馈电机调速系统的连续不间断运行。


3、系统的亮点
1) 电机实现了交流电机的无刷化

电机转子采用了不需引向外部电路的笼型转子或磁阻式结构,电机无滑环和电刷,结构性能上等同于笼型转子电机。与传统绕线式电机相比,结构上更加安全可靠、减少维护工作量、降低维护和运行费用。
2) 调速系统可方便地实现多种运行方式
通过改变主、副绕组的供电方式,可实现电机的软起动、异步运行、同步运行、高于额定转速运行等,并可实现恒转矩全象限无级调速,还可作发电机使用。与普通高压鼠笼式异步电机的控制器相比,可实现低压控制器对高压电机的控制,控制器的容量大幅减小,大大降低了系统的成本。
3)良好动态性能
无刷双馈交流电机兼有异步电机和同步电机的共同优点,转速和功率因数可调,提高了调速系统的性能指标。定子磁场定向矢量控制,可以快速控制电机输出扭矩和转速,具有良好动态性能。
4)硬的机械特性
电机的运行转速仅与功率绕组和控制绕组的频率及相序有关,而与负载转矩无关,因此电机具有硬的机械特性。
5)降低谐波对电网的污染
无刷双馈交流电机调速系统只有小部分电能需要处理,因而谐波对电网造成污染很小,可柔性运行的冗余型智能调速器在调速时功率因数和效率均高于其他异步电机30-50%;解决了鼠笼式感应电机、绕线式感应电机、双馈电机等各自的缺点和局限性。
6)降低调速系统成本
降低线路损耗和无功功率损耗,变频器的功率远远小于电机功率,大大降低了变频器的容量,从而降低了调速系统的成本
 

 

SWS-k intelligent speed control system
1、The structure and operational principle of brushless doubly-fed motor (BDFM) speed control system.
   
The BDFM control system includes: brushless doubly-fed motor, three-phase fully-controlled PWM converter with mutual backup function, three-phase uncontrolled rectifier and a switch used to control 3 converters. When the speed control system is in the normal operation, a speed control system is formed by a three-phase uncontrolled rectifier and a three-phase fully controlled PWM converter; when three-phase fully-controlled PWM converter fails, the three-phase fully-controlled PWM converter that is in redundant state replaces the failed three-phase fully controlled converter to ensure high reliable operation of the system.  When the speed control system needs to run in a four quadrant state, 2 three-phase fully-controlled PWM converter will form a back-to-back PWM converter device.
                                   

 

Working principle diagram


The features of this structure are: three-phase power grid is connected with the power winding of BDFM; three-phase fully controlled PWM converter (#1) and the DC-side of three-phase fully-controlled PWM converter (#2) are parallel connected with DC bus capacitor (#9); DC bus capacitor is parallel connected with the output side of DC switch (#7); the input side of DC switch (#7) is connected with the DC side of three-phase uncontrolled rectifier (#3); the AC side of three-phase uncontrolled rectifier (#3) is connected with output side of the AC switch (#8); the output side of AC switch (#6) is connected with the AC side of three-phase fully-controlled PWM converter (#2); AC switch (#6) and the input side of AC switch are connected with the side of three-phase AC transformer (#10); the primary side of three-phase AC transformer (#10) is connected with three-phase power grid; the AC side of three-phase fully-controlled PWM converter (#2) is connected to the output side of AC switch (#5); the input side of AC switch (#5) is connected with the control winding of BDFM; the input side of the AC switch (#5) is connected to the input side of the AC switch (#4); the output side of AC switch (#4) is connected with the AC side of three-phase fully controlled PWM converter (#1).
When the speed control system is in normal operation, three-phase uncontrolled rectifier (#3), DC bus capacitor (#9) and three-phase fully controlled PWM converter (#1) are operating. At this time AC switch (#8), DC switch (#7) and AC switch (#4) are closed, AC switch (#5) and AC switch (#6) are open.
When three-phase fully controlled PWM converter (#1), the three-phase fully controlled PWM converter (#2) that is in redundant state starts running. At this time AC switch (#8), DC switch (#7) and AC switch (#5) are closed, AC switch (#4) and AC switch (#6) are open.
When the speed control system needs to run in a four quadrant state, a back-to-back PWM converter device will be formed by three-phase fully controlled PWM converter (#1), DC bus capacitor (#9) and three-phase fully-controlled PWM converter (#2).
When the voltage of three-phase uncontrolled rectifier (#3), three-phase fully controlled PWM converter (#1) and three-phase fully-controlled PWM converter (#2) match with each other, AC switch (#6) and the input side of AC switch (#8) will connect to three-phase power grid directly.
No impact start can be achieved by controlling the amplitude, frequency and phase of the output voltage of three-phase fully controlled PWM converter (#1) or three-phase fully controlled PWM converter (#2), to track and match the voltage of the control terminal of the BDFM.
 

2、System developing technical background and solutions.
Since there are no maintenance problems for brushes and slip rings, the working lifespan of BDFM is longer than the supporting three-phase fully controlled PWM converters; the system will experience sudden stop once some power device of the converter fails, it is difficult to achieve high reliable operation.
In consideration of the shortcoming of existing technology, the purpose of this research is to provide a redundant brushless doubly-fed motor speed control system that can operate flexibly. When speed control system is operating normally, it is formed by a three-phase uncontrolled rectifier and a three-phase fully controlled PWM converter. When three-phase fully controlled PWM converter fails, when three-phase fully-controlled PWM converter fails, the three-phase fully-controlled PWM converter that is in redundant state replaces the failed three-phase fully controlled PWM converter to ensure high reliable operation of the system, especially the non-stop operation of medium and high voltage BDFM speed control system.
 

3、Creative highlights of the system.
1)The goal of producing brushless AC motor has achieved.
This type of motor is using a cage rotor that is not requiring an external circuit or reluctance structure, there is no clip rings and brushes and it is equivalent to cage rotor motor on structure and performance. Compare with the traditional winding motors, the structure is more reliable. As a result, the maintenance workload is reduced, as well as the costs of operation and maintenance.

 

2)There are multiple modes for speed control system.
By changing the power supply for the primary and secondary winding, the motor can be soft started, asynchronous operated, synchronous operated and operated at a higher speed than rated speed, etc. it can also be operated with constant torque full quadrant stepless speed adjusting, and used as a generator. Compare with the controller of ordinary high-voltage squirrel cage asynchronous motors, it uses low-voltage controller to operate high-voltage motors, which significantly reduced the capacity of the controller and the cost.

 

3)Excellent dynamic performance.
BDFM is with the advantages of asynchronous motors and synchronous motors. Adjustable speed and power factors, and improved the performance of the speed control system. Stator field orients vector control, the output of torque and speed can be quickly controlled with good dynamic performances.

 

4)Hard mechanical properties.
Reduced line loss and reactive power loss, the power of inverter is far less than the power of the motor, which greatly reduced the capacity of the inverter, thereby reduced the cost of speed control system.

 

5)Reduced the pollution that is cost by harmonic to the power grid.
BDFM speed control system only deals with a small amount electric energy, the pollution cost by the harmonic to the power grid is quite small. The shortcomings and limitations of squirrel cage induction motors, winding induction motors and dual-fed motors have been overcome.

 

6)Reduced the cost of control system.
Reduced line loss and reactive power loss, the power of inverter is far less than the power of the motor, which greatly reduced the capacity of the inverter, thereby reduced the cost of speed control system.

 

SWS-K型智能调速系统图【功率范围6(10) kV-200kW-12500kW】

SWS-k intelligent speed control system 【power range 6(10) kV-200kW -12500kW】

公司:上水能源科技有限公司
(北京)地址:北京市海淀区大柳树富海中心2号楼1503室
(广州)地址:广州市高新技术产业开发区科学城科珠路201号G栋315室

(河北)地址:沧州市运河区天昕大厦B1603室
电话:+86-010-51293199 +86-020-32068288 +86-0317-5207833
邮箱:info@rockyss.com
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