An off-grid photo-storage power supply system based on DC sharing regulation

Abstract

The invention belongs to the technical field of new energy electric power, and specifically relates to an off-grid light storage power generation and power supply system based on direct current sharing regulation and control. The system comprises a power generation system, a zone isolation power transformation and generation system, an independent power generation system, an energy storage system, a zone isolation energy transformation and storage system, an independent energy storage system, a first direct current sharing regulation and control system, a second direct current sharing regulation and control system, an Nth direct current sharing regulation and control system, a first step-up transformerD1, a second step-up transformerD2, an Nth step-up transformer, an (N+1)th step-up transformer, a step-down transformer, a user load, an M user load and a power line. A photovoltaic power generation array is connected with the energy storage system through a direct current sharing regulation and control system or a storage battery is connected with a grid-connected inverter of the power generation system through a direct current sharing regulation and control system, thereby realizing joint power supply for the load by a photovoltaic power generation system and an energy storage power generation system in and out of power generation periods, enabling a system to realize direct current sharing regulation and control and enabling a photovoltaic inverter and an energy storage inverter to realize joint output power supply from direct current to alternating current, greatly increasing robustness and reliability of the system, and greatly improving the utilization rate of resources, and the requirement for power supply output under the same load can be reduced by more than 30% of system investment, greatly improving the rate of return on investment of a user.

Description

technical field [0001] The invention belongs to the technical field of new energy electric power, and in particular relates to an off-grid photo-storage power supply system based on direct current sharing regulation. Background technique [0002] The wide application of new energy power and micro-grid has promoted the development of photovoltaic and energy storage complementary power generation and power supply systems, especially off-grid photovoltaic storage or wind storage and wind-solar-storage complementary power generation and power supply systems are new applications in remote areas without electricity or power shortages. One of the main ways of energy and electric power supply. Since photovoltaic power (and wind power) are unstable intermittent power sources, in order to stably supply power to loads, it is necessary to configure a battery with a certain capacity for complementary power supply. The main methods of existing technologies and systems are as follows: figu...

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Problems solved by technology

[0003] Its existing technology uses the power generation system and the energy storage system to supply power to the load during the power generation period. When the power generation is greater than the power consumption of the load, the power is generated to supply power and the remaining power is charged for the energy storage system. When the power generation is less than the power consumption of the load, the energy storage system supplements the power generation. Insufficient power supply at the same time; during the non-generating period, the energy storage system can only supply power to the load, and the maximum power available is only the power supply power of the energy storage system. The total power supply of the system should be greater than the total rated power of the load. If the load is an inductive load, considering the starting power of the load, the power supply should meet more than twice the power output requirements. Generally, the energy storage output design should be ≥ twice the total load At the same time, the energy storage system will affect the battery life and power supply capacity in order not to cause undercharging, so the scale of the corresponding power generation system must be increased, which will greatly increase the configuration of the off-grid solar-storage complementary power generation and power supply system, and reduce resource utilization. In addition to the above-mentioned increased configuration and investment methods, a large number of off-grid optical (and wind) storage power generation and power supply systems demonstrated at home and abroad also use diesel power generation (or gas power generation, etc.) as supplementary power supply. Considering the slow response of diesel power generation, it needs a hot engine state, that is, it is required to be in the power generation running state, and the minimum output power must be more than 20%, so that the oil power supply is quite large, and it will cause environmental pollution and increase the cost of power generation.

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