A f-dp/dv-based scheduling control method for photovoltaic active distribution network

Abstract

The invention discloses a f-dp / dv-based photovoltaic active distribution network scheduling control method, the steps are as follows: (1) Actively collect the actual active power P at the port of the distribution network pcc ; (2) Calculate the port reference active power and actual active power P pcc The power difference ΔP (3) Each photovoltaic power supply performs frequency recovery control, collects the output port frequency f of each photovoltaic power supply, and calculates the corrected rated frequency (4) each photovoltaic power supply performs proportional scheduling control, according to the power difference from the dispatching center The value ΔP and the preset rated value collect the current and voltage of the photovoltaic output, and calculate the corrected rated value (5) each photovoltaic power supply performs droop control, and the reference value obtained by input and calculated by the droop formula (6) each photovoltaic power supply Controls the actual output according to the dp / dv reference. The invention can improve the robustness of the AC micro-grid system, and realize the reliable control of grid-connected-island operation and switching of the AC micro-grid system.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic networking, and in particular relates to an f-dp / dv-based photovoltaic active distribution network scheduling control method. Background technique [0002] With the decline in the cost of photovoltaic power generation, the installed capacity of photovoltaics is increasing day by day. The cleanliness, low noise and easy management of photovoltaic power generation make it an ideal substitute for fuel power generation. However, the discontinuity and randomness of photovoltaic power generation, with the increase of photovoltaic penetration rate, poses a huge challenge to the stable operation of the power grid. [0003] In the prior art, an energy storage system is generally configured to adjust the power balance by utilizing the bidirectional energy flow characteristics of the energy storage to moderate frequency fluctuations. However, in the same microgrid, as the penetration rate of photovolt...

AI Technical Summary

Problems solved by technology

However, in the same microgrid, as the penetration rate of photovoltaics increases, it is necessary to configure energy storage with a larger capacity to balance the power, which will undoubtedly increase the investment.

Moreover, even if enough energy storage is configured, due to the limitation of energy storage capacity, there will still be the possibility of overcharging and overdischarging

[0004] The Chinese patent document with the publication number CN104065099A discloses a hybrid energy storage-based AC-DC hybrid modular microgrid networking structure and method, which realizes the modularization of multi-type loads and multi-type distributed power sources in the AC-DC hybrid microgrid Encapsulation, the modular micro-grid actively participates in the dispatching operation of the large power grid as an independently controllable power supply / load unit; through the reasonable design of the hybrid energy storage system structure and access mode, the seamless switching of the grid-connected / island dual mode becomes a modular micro-grid. The natural properties of the power grid, but there is no specific analysis of the internal control methods and composition

[0005] The Chinese patent document with the publication number CN103280844A discloses an AC-DC hybrid multi-level micro-grid system. The invention has a flexible structure and a modular structure, and can form a variety of system structures and research on grid-connection and off-grid switching of systems at all levels, but its It solves the problem of distributed power generation access, and cannot fully utilize the adjustment ability of controllable resources in the microgrid

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