Micro-grid'source-load-storage 'cooperative interaction control system and micro-grid'source-load-storage' cooperative interaction control method

Abstract

The invention provides a micro-grid'source-load-storage 'collaborative interaction control system and method. The system comprises a master controller, a grid side monitoring unit, a micro-grid side monitoring unit and an energy storage unit, the power grid side monitoring unit is used for measuring a power grid three-phase current signal and a power grid three-phase voltage signal and transmitting the signals to the master controller; the master controller sends out a switching-off command or a switching-on command according to a detected current signal and a detected voltage signal of the power grid, so that the micro-grid enters a grid-connected operation mode or an off-grid operation mode; the micro-grid side monitoring unit is used for measuring a micro-grid current signal and a voltage signal and transmitting the signals to the master controller; and the master controller stores redundant electric energy generated by the new energy power generation device to the energy storage unit according to the detected current signal and voltage signal of the microgrid. According to the invention, electric energy quality can be improved, and electric energy quality problems such as three-phase imbalance, reactive power and harmonic waves can be comprehensively treated according to user demands.

Description

technical field [0001] The invention belongs to the technical field of micro-grid control, and in particular relates to a micro-grid "source-load-storage" collaborative interactive control system and method. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The use of renewable energy is an important means to alleviate the shortage of traditional energy supply and improve the energy structure. However, renewable energy cannot avoid its inherent randomness and intermittency, especially at high penetration rates. The fluctuation of large-scale renewable energy grid-connected power generation will cause a greater impact on the safe and stable operation of the entire power system. Considering the stable operation of the power grid and power quality, we have to adopt the behavior of abandoning wind and light. [0004] In addition, because renew...

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Problems solved by technology

However, renewable energy cannot avoid its inherent randomness and intermittency, especially at high penetration rates. The fluctuation of large-scale renewable energy grid-connected power generation will cause a greater impact on the safe and stable operation of the entire power system. Considering the stable operation of the power grid and power quality, we have to adopt the behavior of abandoning wind and light

[0004] In addition, because renewable energy is mainly concentrated in remote areas with low electricity load, limited by the limitation of transmission capacity, there has been an oversupply phenomenon in many areas, which will also lead to serious curtailment of wind and light, resulting in a large amount of energy Waste, not conducive to the realization of carbon emission reduction

[0005] Moreover, in a hybrid energy distributed system, power problems are diverse and coupled, but most current power devices can only solve a single power problem, and the use of multiple compensation devices is not only expensive but also wastes space

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