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1. This paper studies a new approach, secondary voltage control, to improve voltage stability.

2. Lastly the improved secondary voltage control management in system contingencies is investigated in this paper.

3. A novel fuzzy logic secondary voltage controller based on polar fuzzy logic rule is designed in this paper.

4. The basic idea of CSVC (coordinated secondary voltage control) is surveyed firstly and a novel CSVC model is presented.

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5. The secondary voltage response is analysed, At the same time, the parameter of up pressure and recoil pressure and recoil pressure resistance method are discussed.

6. There are some problems about the secondary voltage switching between voltage transformers of double bus.

7. The improved secondary voltage control based on BCC algorithm is used for corrective control in emergency.

8. The numerical simulation for proposed secondary voltage control system on classical New England power system is executed, and simulation results show that the proposed design scheme is effective.

9. There are some problems about the secondary voltage switching between voltage transformers of double bus. To solve these problems, a new method, soft switch of voltage, was proposed in this paper.

10. Lastly, the conclusion that secondary voltage control can effectively enhance the voltage stability is verified by simulation results.

11. PT secondary voltage step-down is one of the reason which causes the comprehensive error of the electric energy metering equipment.

12. Secondary Voltage Control is a new way of voltage control, firstly the power system is divided into many control areas whose electric distance is remote.

13. It has been shown that a primary input voltage can be transformed to any desired open-circuit secondary voltage by a suitable choice of turns ratio.

14. Voltage hierarchical control is an efficient way to coordinate the voltage control, and the control strategy for the secondary voltage control is the critical part of the voltage hierarchical control.

15. The operation situation of ESP is identified by the main items such as inservice rate of electrostatic fields, inservice rate of equipment, and acceptable rate of secondary voltage and current, etc.

16. When intersected with electric line, the coating of the pipeline will be aging due to secondary voltage inducted.

17. The on-site test results indicate that energy meter's neutral point virtual connection has a great effect on PT secondary voltage drop.

18. At last, the application course was illustrated by analyzing secondary voltage of ignition system.

19. As an example, Finite element analysis and optimization design are made to a voltage transformer of rating primary voltage 35KV, rating secondary voltage 100V, rating frequency 50HZ.

20. In the voltage correction the voltage variation of tie-line nodes is considered and is added into the traditional secondary voltage control as the feedback.