04 Smart Grid Optimization Cooling System-ERG

04 Smart Grid Optimization Cooling System-ERG Product Model and Parameters Product model: KWXFZ-P3 Parameter: Power supply: 2 lines Fan quantity per cooler group: 1~3pcs Rated Power: 3~40Kw Rated current: 9~120A Rated frequency: 50Hz Cooler quantity: 3~6 groups Pump quantity per cooler group:...

Product Details


04 Smart Grid Optimization Cooling System-ERG


Product Model and Parameters


Product model: KWXFZ-P3 


Parameter:

1. Power supply: 2 lines

2. Fan quantity per cooler group: 1~3pcs

3. Rated Power: 3~40Kw

4. Rated current: 9~120A

5. Rated frequency: 50Hz

6. Cooler quantity: 3~6 groups

7. Pump quantity per cooler group: 1pc

8. Rated voltage: 380V

9. Phase: 3

 

Product Characteristic


Through technical innovation, the product of the project has the following characteristic:


1. Control system set up jointly by the ARM platform, PLC, TP277 touch screen

In view of the transformer cooler to the control demand, this project uses PLC for the control device. On the basis of the PLC research, the system employs SIEMENS S7-200 series of PLC and ARM which match to connect TP277 touch screen to build hardware platform of the control system. In order to meet the requirements of the control system, the project adopts four PLC control modules, including the switch module and analog modules. The system takes PPI to communicate, exchange real-time system status, data and control signals between ARM which connect the TP277 touch screen and CPU 224XP. CPU 224XP PLC of S7-200 series uses STEP 7 MicroWIN SP6 for programming and debugging, PORT0 port of CPU 224XP PLC connect six SINAMICS V20 converter through the USS cable, CPU 224XP PLC adjust the frequency of the converter through the instruction to coordinate the corresponding fan and pump speed, and achieve the purpose of controlling the transformer cooler. In order to ensure the reliability of the control system, the project also uses the PLC for the lower machine, and move up the intelligent which can achieve basic control functions and all the chain protection functions. Therefore, even if the ARM system break down, the lower machine PLC can also achieve the basic control of the cooling system functions, and further to ensure system reliability.


2. Two-stage hybrid energy efficiency optimization strategy

The optimal Scheduling Cooling Control System of the smart grid is used to optimize the dispatching concept to realize the energy efficiency optimization of the transformer cooler. In the energy efficiency optimization control, the two-stage optimization strategy is adopted. The optimal combination of putting cooler units in to operation is realized by the upper layer optimization, and the lower layer optimization selects the converter frequency of operating cooler units as the optimization variable to place the operation state of each group of coolers at the high energy efficiency working point. The optimal control scheme also considers the optimal control of the cooler units, which can save energy by matching the pump and fan speed in the same cooler.


3. The drive part to use the frequency converter to replace the traditional contactor

In the main circuit drive part, the system uses the frequency converter and optimal schedule the start and stop state of the converter and the frequency to improve the cooling system energy efficiency and to avoid the contact oxidation defects of the traditional contactor which improve the cooling system reliability.


4. Smart grid optimization scheduling cooling control system with "four remote" communication capabilities 


5. With automatic reduction of order control function

When the system is operating in the "optimized" mode, if the cooler units fail, the control system will automatically set the control mode to chain mode. The reliability of the control system will be achieved by the reduced order of the control mode.


Communication Process

The communication process is as follows:


(1) Initialization

The control system does not provide remote initialization function. The system starts to initialize after power-on. If the local configuration requires activating the DL-634-5-101 remote communication function, the communication service will be started and initialized. At the end of initialization, the M_EI_NA_1 (Initialization Complete) ASDU (Application Service Data Unit) is generated and the ACD (Requested Access Bit) of the function code is set to 1, waiting for remote request of the first level user data. When the first or second level user data are requested, the station will send the ASDU.


(2) Station calls

After receiving the remote station call command C_IC_NA_1 (station <total> call command), the link layer of the local station first confirms the link to the remote side and then submits it to the application layer. The application layer begins to organize those bursts of data into an ASDU, and sets the function code ACD to 1, waiting for remote request of the first level user data. When the first or second level user data are requested by the remote, the local station will send the ASDU.


(3) Remote control

Remote station (control station) can control the system operation by the remote control mode, that is, to switch in the two ways of automation and optimal scheduling. Remote station first send the remote command through the C_SC_NA_1 (single-point command), after receiving the link, the link layer of the local station first confirms the link to the remote side and then submits it to the application layer. The application layer will execute the command and verify during the execution process. If conditions conform, a positive acknowledgment ASDU will be submitted to the link layer, or a negative acknowledgment ASDU to the link layer. At this time, the first-level user data is generated and the ACD of the function code is set to 1, waiting for the remote master station request. When the first or second level user data are requested by the remote, the station will send the “positive / negative acknowledgment” ASDU. If positive acknowledgment, the local station will modify the control mode. But the execution of the command may still fail, so the remote should check the result of the remote control by querying the information object at address 27 in the cyclic data.


(4) Remote adjustment

The remote station (control station) can modify the temperature control target value (set value) of the station by remote adjustment. The remote station first sends the remote control command through C_SE_NC_1 (set value command, short floating point number). After receiving the link, the link layer of the local station first confirms the link to the remote side and then submits it to the application layer. The application layer will execute the command and verify during the execution process. If conditions conform, a positive acknowledgment ASDU will be submitted to the link layer, or a negative acknowledgment ASDU to the link layer. At this time, the first-level user data is generated and the ACD of the function code is set to 1, waiting for the remote master station request. When the first or second level user data are requested by the remote, the local station will send the “positive / negative acknowledgmentASDU. If positive acknowledgment, this station will modify the setting temperature value.


(5) Event Collection

When the various fault information in the above table varies, the local station will organize the displacement information into an ASDU (M_EP_TD_1 <relay protection equipment events with CP56Time2a time stamp>) and set the ACD of the function code to 1, waiting for the remote request. When the first or second level user data are requested by the remote, the local station will send the ASDU.


(6) Period cycle data

The local station will generate once period cycle data per 5s, and organized the current state of the system into two ASDUs (M_ME_NC_1 <measured value, short floating point number> and M_SP_NA_1 <single point information>). When the second level user data are requested by the remote, the local station will send the ASDU.


Participated Project

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1.Tianjin Dagang 500KV Substation

2.China Gezhouba Dam Project

3.Complete transformer life extension project on a 60000 KVA McGraw Edison transformer

4.Twin 250kw units(New ABB Arc Furnace Reactor installation at Nucor Steel Mill)

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This is Blanca Chen, from Zhejiang ERG Technology Joint Stock Co.,Ltd. We manufacturer and design transformers accessories. 

 

Products: (Sorry that for the e-mail not to be sent back, our catalogue and web are not attached for our first contact.)
1. All kinds of transformer cooler
2. Oil pump
3. Butterfly valve
4. Oil flow relay 
5. Control cabinet

6. Terminal box etc.
ERG join the draft of the standard for chinese government in transformers accessories, with certifications:CE, CRCC,IRIS,EUP,TS,CNAS,BV etc. 

 

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Whatsapp/Wechat/Tel: 86 13626615457

E-mail: blancachen@erg.cn

 

Best Regards,

Blanca Chen


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