Test method for dynamic response performance of tcr type svc facing impact load with large capacity

Abstract

The invention relates to a dynamic response performance test method for a TCR (Thyristor Controlled Reactor) type SVC (Static Var Compensator) for large-capacity shock load. The method includes the following steps that: influences on electric energy quality caused by a test are analyzed, a switching scheme is determined; a target reactive power value and a response lower-limit value of a TCR is calculated; a test point is arranged, required signals are synchronously acquired; and the actual triggering angle of the TCR is obtained, a response performance test is completed. According to the dynamic response performance test method of the TCR type SVC for the large-capacity shock load of the invention, the dynamic response performance of the TCR type SVC is evaluated according to response time; a filtering compensation branch is cut off at a high-voltage synchronous circuit breaker or other switching devices when current crosses a zero point, bus-bar voltage, total incoming current, the feeder current of the cut-off filtering compensation branch, and the phase current of the TCR are acquired; the zero crossing cutoff point of the feeder current of the filtering compensation branch is adopted as a zero time point; a triggering delay angle corresponding to 10% of the target reactive power value of the TCR is the response lower-limit value; a time point when the actual triggering angle in the phase current waveforms of the TCR is larger than the response lower-limit value is a response time point; and the difference value of the zero time point and the response time point is the response time.

Description

technical field [0001] The invention relates to the field of static var compensator performance test methods, in particular to a TCR type SVC dynamic response performance test method for large-capacity impact loads. Background technique [0002] With the rapid development of the national economy, a large number of new loads are constantly emerging, especially the wide application of power electronics technology, which has caused great changes in the structure and characteristics of power loads. At present, there are a large number of nonlinear impact loads in the power system, such as AC electric arc furnaces, continuous rolling mills, high-power welding machines, port cranes, coal hoists, and large converter units. These nonlinear, impulsive and asymmetrical loads generate impulsive reactive power and harmonic currents and inject them into the grid, making voltage fluctuations and flickering, three-phase unbalance, and harmonic pollution of the public grid increasingly seri...

AI Technical Summary

Problems solved by technology

Obviously, the SVC oriented to the power system adopts the response time test method of approximating the step voltage to obtain the effective value curve, which cannot meet the requirements of the SVC device for the impact load. The physical meaning is not clear, the algorithm is relatively complicated, and the detection accuracy is easily affected by the grid parameters and sampling methods

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