1. Zhumei MIAO China Session 3 – Block 1.4 – Question Z Barcelona 12-15 May 2003 1 DEVELOPMENT AND APPLICATION OF THE REACTIVE POWER & VOLTAGE REAL TIME MONITORING SYSTEM FOR DISTRIBUTION NETWORKS Zhumei MIAO Shaanxi Electric Power Company of China - China Miaozhumei@sohu.com

2. Zhumei MIAO China Session 3 – Block 1.4 – Question Z Barcelona 12-15 May 2003 2 Relationship between RPVRTMS and existent automation systems

3. Zhumei MIAO China Session 3 – Block 1.4 – Question Z Barcelona 12-15 May 2003 3 Aim of the monitoring system (1) To get the data and reports needed by reactive voltage managing personnel using related reactive power and voltage real-time information and data in automation systems; (2)To realize the real-time monitoring of voltage values and reactive voltage regulation equipment at main monitoring points; (3)To realize the computerized management of the entire process according to the requirements of the reactive voltage management.

4. Zhumei MIAO China Session 3 – Block 1.4 – Question Z Barcelona 12-15 May 2003 4 System environment and developing tools Database :ORACLE 8 or ORACLE 8i Network :LAN Operation System:WINDOWS 98/2000/XP The software is worked out by integrating C/S with B/S structures. Developing Tools: powerbuilder 8.0, JSP and VC++

5. Zhumei MIAO China Session 3 – Block 1.4 – Question Z Barcelona 12-15 May 2003 5 Function modules of the system RPVRTMS System Maintenance Reactive Power & VoltageEquipment Management Equipment Operation Management Allowable Voltage Deviation Acceptance Ratio LM & Power Factor Statistics System Power Flow Diagram Intelligent Analysis Reports Management

6. Zhumei MIAO China Session 3 – Block 1.4 – Question Z Barcelona 12-15 May 2003 6 Major technical difficult points and solutions It is impossible to direct access the data from the databases of other systems –message request transmitting and receiving program A huge volume of real-time data process –to render all the time- and energy-consuming task to be allocated to be done between one and three A.M when there is the lightest database load

7. Zhumei MIAO China Session 3 – Block 1.4 – Question Z Barcelona 12-15 May 2003 7 System parameter maintenance setting of all important parameters, and management and maintenance of the off- line data. off-line data input and some other essential functions to increase the flexibility, adaptability and safety for the customer.

8. Zhumei MIAO China Session 3 – Block 1.4 – Question Z Barcelona 12-15 May 2003 8 Reactive power and voltage equipment management equipment desk account and device defects to work out reactive voltage management materials Include: –loaded voltage-regulation capacitors /reactors /automatic voltage- regulation control devices /10KV line reactive compensation capacitors / 380V low-voltage reactive dynamic compensation boxes / capacitors of the customer/ statistical-type voltage monitor

9. Zhumei MIAO China Session 3 – Block 1.4 – Question Z Barcelona 12-15 May 2003 9 Voltage deviation monitoring module monitoring of the voltage deviation of subordinate units and main monitoring points Data resources: SCADA, LM, DMS and monitoring points Functions: –Statistical functions –Monitoring functions –Inquiry functions

10. Zhumei MIAO China Session 3 – Block 1.4 – Question Z Barcelona 12-15 May 2003 10 Load Management and Power Factor Statistics monitoring of the reactive power equilibrium Data resources: SCADA, LM, DMS and remote meter readings of power Functions: –The network-wide reactive load and power factor –The regional reactive load and power factor –The active load, reactive load and power factor for all voltage grades –…

11. Zhumei MIAO China Session 3 – Block 1.4 – Question Z Barcelona 12-15 May 2003 11 Other Modules Intelligent analysis System power flow distribution diagram Reports management

12. Zhumei MIAO China Session 3 – Block 1.4 – Question Z Barcelona 12-15 May 2003 12 Application results of system System was put into use at the beginning of 2002 More than 200 voltage monitoring points 35 kV to 110 kV the line losses were reduced by 0.5 % and resulting in 15 million kWh saved

13. Zhumei MIAO China Session 3 – Block 1.4 – Question Z Barcelona 12-15 May 2003 13 Conclusions The Reactive Power & Voltage Real Time Monitoring System had been developed on the information and data base of existent automation systems. The monitoring system can help relative person to know the system status so they can take the optimal measures to improve the voltage quality and reduce the line loss of the system. The Monitoring system had shown good results since the system put into operation. It is needed to put into the system the monitoring of the new indexes such as harmonic wave,three-phase unbalance, voltage fluctuation transient change and voltage drop etc.

14. Zhumei MIAO China Session 3 – Block 1.4 – Question Z Barcelona 12-15 May 2003 14 Thank you