Photovoltaic virtual synchronous control method based on power tracing

A virtual synchronization and control method technology, applied in photovoltaic power generation, conversion of irreversible DC power input to AC power output, AC network circuits, etc., can solve the problems that centralized photovoltaic inverters cannot regulate frequency and voltage of power grids, etc.

Active Publication Date: 2018-06-15
HEFEI UNIV OF TECH +2
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  • Abstract
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  • Claims
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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that the centralized photovoltaic inverter cannot regulate the frequency and voltage of the power grid, and provide a photovoltaic virtual sy

Method used

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  • Photovoltaic virtual synchronous control method based on power tracing
  • Photovoltaic virtual synchronous control method based on power tracing
  • Photovoltaic virtual synchronous control method based on power tracing

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Embodiment Construction

[0084] The present embodiment will be specifically described below in conjunction with the accompanying drawings.

[0085] figure 1It 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.

[0086] 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 follo...

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Abstract

The invention discloses a photovoltaic virtual synchronous control method based on power tracing. The method comprises the following steps: adopting a power superposition equation to obtain a power command, obtaining a direct current side reference voltage according to a power tracing method based on polynomial fitting, and after obtaining photovoltaic panel reference power through a voltage loop,obtaining a d-axis active power command through a power outer loop; obtaining a reactive power command through a once voltage regulation equation, and then obtaining a current dq-axis command to carry out current closed loop control. Flexible control for active power is reached by controlling the size and direction of the direct current side reference voltage, and the reactive power is adjusted through the once voltage regulation equation. The step length magnitude of the direct current side reference voltage is obtained through a polynomial fitting method, and the direction is obtained through a power tracing method. Energy storage equipment does not need to be added to an inverter, the frequency and voltage of a power grid can be adjusted, and the stability of the system and preferableregulation effect for frequency voltage can be guaranteed.

Description

technical field [0001] The invention belongs to the field of photovoltaic inverter grid-connected frequency modulation and voltage regulation control, and in particular relates to a photovoltaic virtual synchronous control method based on power tracking. Background technique [0002] With the deterioration of the environment and the aggravation of the energy crisis, new energy sources such as photovoltaics and wind power are playing an increasingly important role in social development. At the same time, distributed power generation technology is developing rapidly and has become a research hotspot at home and abroad. [0003] At present, with the continuous integration of new energy sources such as photovoltaics and wind power into the grid, the installed capacity of traditional synchronous generators continues to decline. Therefore, the penetration rate of new energy is gradually increasing, so that the rotational inertia and damping of the power grid are relatively reduced...

Claims

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Application Information

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IPC IPC(8): H02J3/46H02J3/38H02M7/48
CPCH02J3/383H02J3/46H02M7/48Y02E10/56
Inventor 张兴张海峥秦世耀王瑞明李少林李明刘芳谢震
Owner HEFEI UNIV OF TECH
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