Microgrid voltage-stabilizing device and control method thereof

Abstract

The invention discloses a microgrid voltage-stabilizing device and a control method thereof. The microgrid voltage-stabilizing device comprises a wind power generation power module, a photovoltaic power generation power module, a capacitor group module, a single-phase asynchronous motor group module and a PLC controller module, wherein the wind power generation power module and the photovoltaic power generation power module are connected to form a common coupling point; the capacitor group module and the single-phase asynchronous motor group module are connected with the common coupling point respectively; the PLC controller module monitors microgrid voltage, power generation voltage of the wind power generation power module and power generation voltage of the photovoltaic power generation power module, needed compensated capacity of the microgrid is calculated according to the monitored signals, logic signals are generated to control the capacitor group module or the single-phase asynchronous motor group module to compensate the microgrid according to the needed compensated capacity of the microgrid, and voltage-stabilizing control is realized. Dual-closed loop PI is adopted to select numbers of switch capacitor groups and asynchronous motors, the switch amount is controlled precisely, system complexity is reduced, stability and reliability are improved, the control efficiency is improved, and the cost is reduced.

Description

Technical field: [0001] The invention belongs to the technical field of voltage stabilization of a microgrid system, and in particular relates to a microgrid voltage stabilizing device and a control method thereof. Background technique [0002] With the deepening of the energy crisis, the use of new energy power generation to replace traditional power generation has become the focus of research all over the world. Our country attaches great importance to the use of clean energy such as solar energy and wind energy as power generation sources, and has proposed a series of economic development strategies for new energy power generation. Due to the uncertainty of its natural resources, new energy power generation makes the grid voltage fluctuate greatly, which reduces its reliability. If the grid voltage fluctuates seriously, it may even cause major losses. Therefore, how to stabilize the voltage of the microgrid system has broad prospects. [0003] Distributed power generati...

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Problems solved by technology

The above three are common voltage stabilization methods, which require more power tubes, and the energy storage system has a large capacity, the overall control is more complicated, and the cost is high

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