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(北京)地址:
北京市海淀區大柳樹富海中心2號樓1503室
(廣東)地址:
廣州市高新技術產業開發區科學城科珠路201號G棟315室
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總部:滄州市運河區天昕大廈B1603室

生產基地:滄州市高新區激光產業園

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您現在的位置:調速器介紹
調速器介紹

SWS-k型智能調速系統:
 

1、無刷雙饋電機調速控制系統的結構和工作原理

 

本無刷雙饋電機調速控制系統主要包括;無刷雙饋電機、互為備份的三相全控型PWM變流器、三相不可控整流器及用于控制三個變流器通斷的開關。調速系統正常工作時由三相不可控整流器和一個三相全控型PWM變流器形成調速系統;當三相全控型PWM變流器發生故障時,由處于冗余狀態的三相全控型PWM變流器取代故障狀態的三相全控型PWM變流器,確保系統的高可靠性運行。當調速系統需要運行在四象限狀態時,由兩個三相全控型PWM變流器形成背靠背式PWM變流裝置。
                                          

工作原理圖

 

本系統的結構特征是:三相電網與無刷雙饋電機的功率繞組相連;三相全控型PWM變流器1和三相全控型PWM變流器2的直流側均與直流母線電容7并聯;直流母線電容與直流開關7的輸出側并聯;直流開關7的輸入側與三相不可控整流器3的直流側相連;三相不可控整流器3的交流側與交流開關8的輸出側相連;交流開關6的輸出側與三相全控型PWM變流器2的交流側相連;交流開關6和交流開關8的輸入側與三相變壓器10的副邊相連,三相變壓器10的原邊與三相電網相連;三相全控型PWM變流器2的交流側與交流開關5的輸出側相連;交流開關5的輸入側與無刷雙饋電機的控制繞組相連;交流開關5的輸入側與交流開關4的輸入側相連;交流開關4的輸出與三相全控型PWM變流器1的交流側相連。

調速系統正常工作時,三相不可控整流器3、直流母線電容9和三相全控型PWM變流器1投入運行,此時交流開關8、直流開關7和交流開關4閉合,交流開關5和交流開關6斷開。

當三相全控型PWM變流器1發生故障退出運行時,由處于冗余狀態的三相全控型PWM變流器2投入運行,此時交流開關8、直流開關7和交流開關5閉合,交流開關4和交流開關6斷開。

當調速系統需要運行在四象限狀態時,由三相全控型PWM變流器1、直流母線電容9和三相全控型PWM變流器2形成背靠背式PWM變流裝置。

當三相電壓與整流器3、三相全控型PWM變流器1和三相全控型PWM變流器2的電壓相匹配時,交流開關6和交流開關8的輸入側可直接與三相電網相連。

通過控制三相全控型PWM變流器1或三相全控型PWM變流器2輸出電壓的幅值、頻率和相位,使其跟蹤無刷雙饋電機的控制繞組端電壓相匹配,從而實現無沖擊啟動。


2、系統研制的技術背景及解決方案

由于無刷雙饋電機不存在電刷和滑環的維護問題,使得其工作壽命遠比與其配套的三相全控型PWM變流器工作壽命長,一旦變流器中某一功率器件發生故障,系統必然發生突發性停機,很難實現調速系統的高可靠性運行。

鑒于上述現有技術的不足之處,本研發的目的在于提供一種可柔性運行的冗余型無刷雙饋電機調速系統,當調速系統正常工作時由三相不可控整流器和一個三相全控型PWM變流器形成調速系統;當三相全控型PWM變流器發生故障時,由處于冗余狀態的三相全控型PWM變流器取代故障狀態的三相全控型PWM變流器投入運行,確保系統的高可靠性,特別是確保中高壓無刷雙饋電機調速系統的連續不間斷運行。


3、系統的亮點
1) 電機實現了交流電機的無刷化

電機轉子采用了不需引向外部電路的籠型轉子或磁阻式結構,電機無滑環和電刷,結構性能上等同于籠型轉子電機。與傳統繞線式電機相比,結構上更加安全可靠、減少維護工作量、降低維護和運行費用。
2) 調速系統可方便地實現多種運行方式
通過改變主、副繞組的供電方式,可實現電機的軟起動、異步運行、同步運行、高于額定轉速運行等,并可實現恒轉矩全象限無級調速,還可作發電機使用。與普通高壓鼠籠式異步電機的控制器相比,可實現低壓控制器對高壓電機的控制,控制器的容量大幅減小,大大降低了系統的成本。
3)良好動態性能
無刷雙饋交流電機兼有異步電機和同步電機的共同優點,轉速和功率因數可調,提高了調速系統的性能指標。定子磁場定向矢量控制,可以快速控制電機輸出扭矩和轉速,具有良好動態性能。
4)硬的機械特性
電機的運行轉速僅與功率繞組和控制繞組的頻率及相序有關,而與負載轉矩無關,因此電機具有硬的機械特性。
5)降低諧波對電網的污染
無刷雙饋交流電機調速系統只有小部分電能需要處理,因而諧波對電網造成污染很小,可柔性運行的冗余型智能調速器在調速時功率因數和效率均高于其他異步電機30-50%;解決了鼠籠式感應電機、繞線式感應電機、雙饋電機等各自的缺點和局限性。
6)降低調速系統成本
降低線路損耗和無功功率損耗,變頻器的功率遠遠小于電機功率,大大降低了變頻器的容量,從而降低了調速系統的成本
 

 

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型智能調速系統圖【功率范圍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:北京市海淀區大柳樹富海中心2號樓1503室
(廣州)地址:廣州市高新技術產業開發區科學城科珠路201號G棟315室

(河北)地址:滄州市運河區天昕大廈B1603室
電話:+86-010-51293199 +86-020-32068288 +86-0317-5207833
郵箱:[email protected]
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