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Lagrange interpolation forecast-based photovoltaic virtual synchronous control method

A technology of virtual synchronization and control method, which can be used in photovoltaic power generation, AC network circuits, electrical components, etc., and can solve problems such as inertial frequency modulation difference

Active Publication Date: 2018-09-07
HEFEI UNIV OF TECH +2
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Problems solved by technology

[0015] The purpose of the present invention is to provide a photovoltaic virtual synchronous control method based on numerical interpolation prediction for the problem of poor inertial frequency modulation due to filter lag in the dynamic frequency modulation process of the photovoltaic virtual synchronous machine. This method does not need to add additional complex prediction algorithms and simplify It only needs to improve the photovoltaic virtual synchronization strategy, which can control the power in advance, so that the photovoltaic virtual synchronous generator has a better frequency modulation effect

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  • Lagrange interpolation forecast-based photovoltaic virtual synchronous control method

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Embodiment Construction

[0093] The present embodiment will be specifically described below in conjunction with the accompanying drawings.

[0094] figure 1 It is a grid-connected structural diagram of a photovoltaic virtual synchronous machine according to an embodiment of the present invention. The specific parameters are as follows: the number of the inverter is #i=1. The rated output line voltage of inverter #i is 380V / 50Hz, and the DC side filter capacitor C in =15mF, filter inductance L on bridge arm side f =0.06mH, AC measurement filter capacitance C f =300uF, the filter inductance value of the grid side is L g =0.02mH, the rated capacity of the inverter is 500KVA. Inverter #1 wiring impedance is Z L =0.001+j0.001Ω.

[0095] figure 2 It is a block diagram of the control structure of the photovoltaic virtual synchronous generator according to the embodiment of the present invention. It can be seen from this figure that the steps of the control method of the present invention are as foll...

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Abstract

The invention discloses a Lagrange interpolation forecast-based photovoltaic virtual synchronous control method. The method comprises the steps of acquiring a power instruction by a power superposition equation, forecasting power by a Lagrange interpolation forecast method, acquiring a DC-side reference voltage according to a polynomial fitting power tracing method, and acquiring a d-axis active power instruction after voltage ring and a power outer ring; and acquiring a reactive power instruction by a primary voltage regulation equation, further obtaining a current dq-axis instruction, and performing current closed-ring control. By the Lagrange interpolation forecast method, delay caused by low bandwidth of a phase-locked loop and a filter can be reduced, advanced control is achieved, anda better adjustment effect on a frequency of a power grid is achieved.

Description

technical field [0001] The invention belongs to the field of photovoltaic inverter grid-connected control, and in particular relates to a photovoltaic virtual synchronization control method based on Lagrangian interpolation prediction. Background technique [0002] With the deterioration of the environment, the aggravation of the energy crisis, technological progress, and the reduction of device production costs, new energy generation technologies such as photovoltaics and wind power have developed rapidly and become research hotspots at home and abroad. [0003] The distributed power generation system is connected to the grid through the output of power electronic devices such as inverters. Although the transient response speed is fast, it does not have inertia and cannot support the primary frequency regulation of the grid. When large-scale new energy is connected to the grid, the penetration rate of the power grid continues to increase, and the installed capacity of tradi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/42
CPCH02J3/385H02J3/42Y02E10/56
Inventor 张兴张海峥刘纯何国庆李明谢震
Owner HEFEI UNIV OF TECH
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