Outline
- I. Introduction
- II. Test Circuits
- III. Operating Principle and Testing Methods
- IV. Continuous Firing Control of the Test Valve
- V. Analysis and Protection of Fault Overvoltage
- VI. Parameter Coordination of the Mist Circuit
- VII. Experimental Validation
- VIII. Conclusion
رئوس مطالب
- چکیده
- 1.مقدمه
- 2.مدارهای تست
- 3.قانون عملکردی و روش‌های تست
- A قانون عملکردی حالت افزایش دما
- B قانون عملکردی حالت اضافه‌جریان
- C قانون عملکردی حالت تست ترکیبی
- 4.کنترل آتش‌زنی (فرمان‌دهی) پیوسته دریچه تست
- 5.تحلیل و حفاظت اضافه‌ولتاژ خطا
- A. تحلیل اضافه‌ولتاژ خطا
- B. روش حفاظت اضافه‌ولتاژ
- 6.هماهنگی پارامتری مدار تست
- 7.ارزیابی عملی (آزمایشگاهی)
- A تست افزایش دما
- B.تست اضافه‌جریان
- C.تست ترکیبی
- 8.نتیجه‌گیری
Abstract
Developed synthetic test circuits for thyristor valves of flexible ac transmission systems (FACTS) are established in this paper. By controlling the thyristor valves of synthetic test circuits, it can reproduce test stresses, including, but not limited to, the forward high voltage before the thyristor valve withstanding overcurrent and reverse recovery voltage after thyristor valves withstanding overcurrent, on thyristor valves in FACTS equipment equal to or greater than those that appear in commercial projects. With corresponding test circuits and control strategies, the temperature-rise test, overcurrent test, and the synthetic test for thyristor valves can be performed, respectively. Then, a protection method of synthetic test circuits is presented. Finally, a temperature-rise test platform, overcurrent test platform, and synthetic test platform for thyristor valves have been set up, respectively. The test results show that the developed circuit and proposed control and protect strategies are available to test for thyristor valves used in FACTS.
Keywords: Break over diode (BOD) - controllable high voltage shunt reactor (CSR) - flexible ac transmission systems (FACTS) - operational tests - static var compensators (SVC) - synthetic test circuits - thyristor valve - thyristor-controlled series compensation (TCSC)Conclusions
Operational tests are a key process for verifying the design of the FACTS thyristor valve employed in commercial projects. Considering the high-power rating of modern thyristors, synthetic tests are an effective alternative from the point of economy and practicability. The conventional current control of the thyristor valve cannot reproduce certain characteristics of the thyristor valve in service, such as forward HV before turning on the test valve and reverse recovery voltage after half of a periodic resonance for the thyristor valve. Tests experiences with FACTS thyristor valves have proved that those new synthetic test circuits and new voltage control are a technical feasibility and economy-saving solution in valve design verification.