| Abstract:Mine hoist is an important production equipment which is widely used in mining companies. The mine hoist using thyristor DC motor (SCR-D) transfer supply power. As the thyristor is nonlinear and hoist requires start and stop frequently during its running time. The hoist not only produces a large number of reactive current which distort the voltage and current, bust also generates a large number of high order harmonic component which pour into the power system through the high voltage side of transformer. Then, the power quality of the whole system and the surrounding users would be reduced. Therefore, the study on the reactive power compensation and harmonic control for mine hoist system is of great significance to improve power quality of mine power supply system.Taking a heavy metal mine hoist system as an example, the paper analyzes the characteristics of the power supply system of mine hoist.According to the test results of reactive power and harmonic of mine hoist, and the characteristics of the12-pulse rectifier equipment. The FC (Fixed Capacitor) group is able to filter the power harmonics generated by mine12pulse rectifier so that the SVG (Statcom Var Generator) is used as reactive compensation of mine hoist system. The main circuit structure and relative parameters of the compensation device and filter banks has been designed. A multi-objective control strategy of SVG has been proposed to suppress the system bus voltage fluctuation.In this paper, numerical simulation has been done via PSCAD simulation software to test the controling system. Finally the simulation results show that the designed parameters of the SVG+FC type reactive power compensation and harmonic control devices meet the design requirements. And the device has good dynamic performance which can achieve the expectation effect of reactive power compensation and harmonic suppress, what’s more, the device could compensate the reactive power and system voltage by multi-objective control strategy. In the end, a practical application involving the reactive compensation is validated and the results show that the reactive compensation and harmonic suppression technology is feasibility and effectiveness. Figures(43), Tables(7), References(63). |
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