System and method for controlling online type photovoltaic power generation microgrid without storage device

Abstract

The invention discloses a system and a method for controlling an online type photovoltaic power generation microgrid without a storage device. The system comprises a photovoltaic component, a power controller, a grid-connected inverter system, a current detection device and a reverse-power protector, the photovoltaic component is connected with the grid-connected inverter system through the power controller, output of the grid-connected inverter system and grid current are connected to simultaneously supply power to load, the power controller enables a photovoltaic power generation system to be in a variable power output state and dynamically adjusts output power of the photovoltaic power generation system according to changes of the load, the current detection device detects magnitude and phase position of the grid current as current feedback control signals of the grid-connected inverter system, and the reverse-power protector is positioned between the microgrid and an outer grid to stop the microgrid from transmitting current to the outer grid. The system is free of a storage battery energy storage system, the outer grid is only a supplement when the microgrid is in power shortage, and power transmission to the outer grid is effectively avoided, so that effects of electricity saving can be realized without upgrading power transmission networks and power distribution networks, and popularization is facilitated.

Description

technical field [0001] The invention relates to photovoltaic distributed power generation technology and a microgrid, in particular to an online photovoltaic power generation microgrid control system and method without energy storage devices (such as storage batteries, various capacitors, etc.). Background technique [0002] With the gradual consumption of conventional energy, renewable energy has attracted increasing attention. Solar energy is favored for its safety, cleanness, and ease of installation. It plays an increasingly important role in improving my country's energy structure, energy conservation and environmental protection, and reducing dependence on traditional energy sources. [0003] With the advancement of science and technology, the cost of photovoltaic modules has been greatly reduced, creating good conditions for the promotion of distributed power generation. The so-called distributed power generation usually refers to a modular, low-power, distributed po...

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Problems solved by technology

[0005] After searching the public literature of the existing technology, it was found that the Chinese patent publication number: CN101697421A, (public date 2010.04.21,) discloses a micro-grid photovoltaic micro-power control system, and consults the current research on micro-grid at home and abroad In most cases, all designs are inseparable from energy storage devices (usually batteries). Considering the limited life of batteries, low energy density (bulky), high cost, and pollution, there are constraints on the application of new energy and microgrids. Therefore, if energy storage devices such as batteries can be removed in the practical application of general miniaturization, it will undoubtedly improve the reliability of new energy and micro-grid applications, reduce costs, and promote the popularization and use of new energy.

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