Relay protection test system for intelligent transformer substation

Abstract

The invention relates to a relay protection test system for an intelligent transformer substation. The system comprises a signal generator capable of generating multi-channel independent high-precision digital signals, the signal generator adopts a recursion direct operation method, and an operational formula is sin (n theta) =2cos (theta) (sin (n-1) theta)-sin ((n-2) theta) to realize the recursion operation, wherein the sin (theta) =sin (2phi f/fs), is an initial value, and is computed by taylor series. A sinusoidal signal generated by the algorithm on the invention is obtained by the recursion direct operation method rather than the conventional lookup interpolation method; the operation word length needs more than 64 bits according to the interpolation method, and the operation quantity can be greatly improved after the operation word length is prolonged, so that only the 12-channel real-time output can be abandoned; the system adopts the trigonometric function formula: sin (n theta) =2cos (theta) (sin (n-1) theta)-sin ((n-2) theta) to realize the recursion operation, wherein the sin (theta) =sin (2phi f/fs), is an initial value, and is computed by taylor series, and any precision requirement can be reached as required; the recurrence formula is a 2-order FIR (filter) actually, and a DSP (digital signal processor) chip can compute a sampling point within two machine periods, so that the operation speed is very fast.

Description

technical field [0001] The invention relates to an intelligent substation relay protection test system, which belongs to the technical field of smart grid communication equipment. Background technique [0002] The development of smart grid puts forward new requirements for data communication between substation equipment: higher speed, more reliable mechanism, and more convenient interconnection and access. In order to meet this requirement, the International Electrotechnical Commission (IEC) released the standard IEC61850 for substation communication networks and systems in 2003. Based on this standard, my country issued the "Power Industry Standardization Guidance Technical Document DL / Z 860" in 2004. Substations that use equipment that meets this standard are so-called smart substations (early called digital substations). [0003] Intelligent substations use digital electrical measurement systems, such as optical transformers or electronic transformers, in the collection ...

AI Technical Summary

Problems solved by technology

However, it is difficult for domestic and foreign equipment to produce satisfactory high-precision