Diesel oil power generation and gas triple-generation hybrid energy supply microgrid system and control method thereof

Abstract

The invention discloses a diesel oil power generation and gas triple-generation hybrid energy supply microgrid system which comprises an alternating current bus, a cold / heat load and a power load, a photovoltaic power generation system, a diesel oil power generation system, a triple-generation system and a control system, wherein the cold / heat load is connected with the alternating current bus through the power load; the photovoltaic power generation system and the diesel oil power generation system are respectively connected with the alternating current bus; the triple-generation system is respectively connected with the alternating current bus and the cold / heat load; and the control system is respectively connected with the photovoltaic power generation system, the diesel oil power generation system and the triple-generation system. The invention further discloses a control method for the diesel oil power generation and gas triple-generation hybrid energy supply microgrid system. According to the diesel oil power generation and gas triple-generation hybrid energy supply microgrid system and the control method for the same disclosed by the invention, on one hand, two master-control power supplies can be selected during operation, so that the reliability of the system is improved; and on the other hand, various energy source (cold / heat / power) outputs can be provided, so that the requirement of the cold / heat load can be directly met while the requirement of the power load is met, the utilization efficiency of energy source is higher and the energy supply cost of the system is effectively reduced.

Description

technical field [0001] The invention relates to a micro-grid power supply system in the field, and in particular to a micro-grid system and a control method thereof for a hybrid power supply of a diesel generator and a gas triple supply. Background technique [0002] Micro-grid independent power supply systems are often used to supply residents or other electricity in remote areas or island areas. Distributed power sources in such micro-grids generally include photovoltaic power generation, wind power generation, diesel generators (hereinafter referred to as diesel generators) and battery energy storage. Systems, etc., through the coordinated control of these power sources to ensure the normal power supply of the load in the area. [0003] The invention patent of the Chinese patent (publication number CN102157978A, publication date is August 17, 2011) discloses an isolated micro-grid system for wind and diesel storage and its control method, which uses batteries, photovoltai...

AI Technical Summary

Problems solved by technology

[0004] The types of traditional micro-grid systems include several major categories such as solar-storage micro-grids, wind-solar-storage micro-grids, wind-solar diesel-storage micro-grids, etc., and they all focus on power generation and electricity consumption, and considering island resource constraints and transportation conditions, etc. Due to the limited operating efficiency of diesel generators, the traditional micro-grid system cannot achieve the most economical operation mode. In addition, considering the cooling / heating load demand, the traditional micro-grid system basically relies on electricity to meet the demand of this part of the load. Its energy supply efficiency is very limited; and in the prior art, there are few microgrid systems that focus on satisfying loads with comprehensive energy (cold / heat / electricity) demands and maximizing energy utilization efficiency

[0005] In summary, the island microgrid system composed of photovoltaic (wind power) and diesel generators needs to convert electric energy into cooling and heat while meeting the demand of electric load, so as to meet the needs of different cooling / heating loads. The micro-grid system has the following disadvantages: 1) high power generation cost; 2) low energy utilization efficiency in the energy conversion process; 3) the system has only one main power supply. Reduced power supply reliability

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