Full automatic mixed type reactive power compensation control system and method for shield tunneling machine

Abstract

The invention discloses a full automatic mixed type reactive power compensation control system and method for a shield tunneling machine. The control system comprises a DSP controller, a fuzzy PI decoupling controller, a capacitor cyclic controller and a reactive power automatic compensation system, wherein the reactive power automatic compensation system comprises a TATCOM and a TSC group. The full automatic mixed type reactive power compensation control method for the shield tunneling machine comprises the steps of enabling the DSP controller to perform reasoning and judging, determining the switching group number of the TSC group and a TATCOM expected output current value, providing a switching signal and a compensation current fixed value, and enabling the TATCOM to receive a PWM signal and to output a feedback current; enabling the TATCOM to provide inductive reactive power and capacitive reactive power with relatively low capacity; and enabling the TSC group to provide high-capacity capacitive reactive power. By combination of the advantages of the TATCOM and the TSC group, stepless regulation of the reactive power can be realized, while power grid voltage drop and voltage fluctuation and resonance between the TSC group and the system can be suppressed; and the control system is low in cost and simple to control, and capable of satisfying dual demands of reactive compensation high capacity and high precision of a power supply system of the large-sized shield tunneling machine.

Description

technical field [0001] The invention belongs to the technical field of shield machine automatic control, and in particular relates to a fully automatic hybrid reactive power compensation control system and method for a shield machine. Background technique [0002] At present, the shield construction method has been more and more widely used in the excavation of tunnels and underground engineering, which has played a positive role in promoting the development of the equipment manufacturing industry, and also proposed new technological developments for the basic component industry "2025 Made in China". Require. Usually there are a large number of inductive loads in the shield machine grid system, and the inductive loads consume a large amount of reactive power. Due to the increase of reactive power flowing in the shield machine power supply network, the increase of active current and apparent power will increase the capacity of electrical equipment such as transformers, contr...

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Problems solved by technology

Static var compensator (STATCOM) can perform dynamic and continuous reactive power compensation. However, when the capacity of a single STATCOM is large, due to the limitation of the manufacturing process and engineering cost of power electronic devices, it is often difficult to design and engineer Difficulty in implementing

Although the Thyristor Switched Capacitor (TSC) can meet the requirements of the project capacity, it cannot perform continuous stepless reactive power compensation, and the response speed of the device is not fast, so it is difficult to meet the requirements of the shield machine power supply system. Requirements for reactive power compensation

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