SVC composite control method based on rapid equivalent susceptance calculation

Abstract

The invention discloses an SVC composite control method based on rapid equivalent susceptance calculation, wherein, an SVC comprises a thyristor controlled reactor (TCR) and a passive filter bank. The SVC composite control method comprises the following steps: firstly, calculating the corresponding equivalent susceptance by using an equivalent susceptance computing method after detecting a voltage signal and a current signal; adding up an open-loop equivalent susceptance output value BLabc and a closed-loop PI regulator output value to obtain a total equivalent susceptance compensation value BTabc; calculating the actual input group number n of PPFs and the actual equivalent susceptance value of the TCR by a power divider according to the compensation value; and searching an Hash table by the TCR according to the actual equivalent susceptance value to obtain a corresponding triggering angle and then triggering opening of a corresponding thyristor to send out corresponding inductive reactive current for compensating capacitive reactive power and negative-sequence current, and finally realizing complete compensation of the reactive power and the negative-sequence current of a system. The SVC composite control method effectively reduces the calculated quantity of the system and improves the response time of the system.

Description

technical field The invention belongs to the technical field of negative sequence and reactive power compensation control, in particular to an SVC composite control method based on fast equivalent susceptance calculation. Background technique With the development of society and economy, the power consumption in industrial fields such as metallurgy, mining and transportation is increasing. Such as alchemy rectification equipment, electric arc furnaces and electric locomotives and other high-power inductive and nonlinear equipment, the resulting power quality problems such as negative sequence, reactive power and harmonics are becoming more and more serious. A large number of negative sequence and Reactive power not only causes a large amount of power loss, but also reduces the safety and stability of the system. At present, SVC is recognized as the best equipment for reactive power compensation due to its high cost performance and fast response, and it can also perform bala...

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Problems solved by technology

Among them, the detection accuracy of the p-q method is affected by the grid voltage waveform. When the grid voltage has a certain distortion, the detection result will have er...

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