Grid-connected interface monitoring system for distributed generation connected to public grid

Abstract

The invention discloses a grid-connected interface monitoring system for distributed power generation access to a public power grid. The system comprises a data monitoring module, a data analysis module, a data summary unit, a power calculation unit, a processor, a display unit, a storage unit, a management unit, a pricing unit, a pricing model and an alarm unit. Through the real-time monitoring of the power supply voltage, harmonic voltage and single-month power consumption of a user, the data summary processing is carried out on a power supply voltage by using the data analysis module to obtain an initial floating ratio F1 and a high floating ratio F2 of a single month. At the same time, the harmonic voltage is analyzed by using the data summary unit to obtain an initial loss coefficientQc and a high loss coefficient Qg. The pricing power analysis of the power calculation unit is used to obtain a total loss coefficient Qz and a floating power consumption Yf. An electricity bill after the accounting is obtained by using the pricing unit with the combination of a pricing rule. In the process, the grid company management personnel and the power user jointly set parameters to influence the final billing, the interaction between the grid company management personnel and the power user is realized, and the price is jointly negotiated.

Description

technical field [0001] The invention belongs to the field of power distribution monitoring, in particular to a grid-connected interface monitoring system for distributed power generation connected to a public power grid. Background technique [0002] With a large number of distributed power sources connected to the public power grid, the distribution network has evolved from a radial and ring-shaped unidirectional distribution network to a multi-terminal power network, where power sources and power loads are intertwined. Distributed power generation has the characteristics of dispersion, instability, and intermittent power generation, which cause problems such as operational stability, power supply and distribution efficiency, and power quality degradation of the public power grid, which in turn limits the ability of the power grid to accommodate distributed power generation. [0003] For power grid companies, there are various types of users, different ways of connecting to...

AI Technical Summary

Problems solved by technology

Obstacles to power grid management and more complex relay protection; but it is impossible to require all distributed power access users, especially 400V access users to adopt a highly automated monitoring and communication system

[0004] For most power users, they can only accept the simple electricity consumption data processed by the grid company on a monthly basis, and the interaction with the grid is not enough, and they cannot grasp the power quality, harmonics and voltage fluctuation of the public grid in real time, which will affect the grid company The quality of power supply; and users cannot negotiate with electricity sales companies based on power quality

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