Photovoltaic virtual synchronous generator control strategy of two-stage photovoltaic power generation system

A photovoltaic power generation system and generator control technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problems of excess system power, unfavorable stable operation of the power system, unstable frequency of the power system, etc. Effect

Pending Publication Date: 2020-12-08
LIAONING INST OF SCI & TECH
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Problems solved by technology

However, MPPT control always keeps the photovoltaic array at the maximum power output state regardless of the power demand of the external load. In the case of high penetration of photovoltaic power generation, it is easy to cause excess power in the system, thereby causing frequency instability of the power system and other power quality problems. question
[0004] The distributed photovoltaic inverter itself does not have rotational inertia and damping. When its penetration rate to the grid is h

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  • Photovoltaic virtual synchronous generator control strategy of two-stage photovoltaic power generation system
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  • Photovoltaic virtual synchronous generator control strategy of two-stage photovoltaic power generation system

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[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] Such as figure 1 , figure 2 , image 3 , Figure 4 As shown, in the control strategy of a two-stage photovoltaic power generation system for a photovoltaic virtual synchronous generator described in this embodiment, the power tracking control unit pairs the photovoltaic array output voltage U PV , output current I PV and the inverter DC bus voltage U DC Perform measurement, and output PWM control signal to the power electronic switching device of the DC / DC conversion circuit, and implement tracking control on the stable operating point of the photovoltaic array. The improved virtual synchronous generator (VSG) control system based on leading differential control takes the DC / AC conversion circuit as the control object, and aims to suppress the power fluctuation generated during the dynamic transition process of the system, and dete...

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Abstract

The invention discloses a photovoltaic virtual synchronous generator control strategy of a two-stage photovoltaic power generation system. A control strategy combining photovoltaic array virtual impedance characteristic disturbance and flexible power point tracking control is adopted in a preceding stage DC/DC link, when the illumination condition changes, a photovoltaic array stable working pointis positioned according to the supply and demand balance relation of the source power and the load power, and the voltage of a direct current bus is kept stable. An improved virtual synchronous generator control strategy based on preamble differential control is adopted in a post-stage DC/AC link, and system power frequency oscillation in the transient transition process is restrained.

Description

technical field [0001] The invention belongs to the technical field of distributed photovoltaic power generation control, and in particular relates to a photovoltaic virtual synchronous generator (PVVSG) control strategy of a two-stage photovoltaic power generation system. Background technique [0002] With the rapid development of the economy, the demand for energy in social production is increasing, the traditional fossil energy is decreasing, the environmental pollution is becoming more and more serious, energy and environmental problems are becoming more and more apparent, and the development of green renewable energy to replace fossil energy has become an energy source. inevitable trend of development. [0003] As a typical green renewable energy, solar energy can solve the energy crisis caused by the depletion of traditional fossil energy, and photovoltaic power generation is currently a major form of solar energy development and utilization. The output of photovoltai...

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Application Information

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IPC IPC(8): H02J3/38H02J3/48H02J3/24
CPCH02J3/381H02J3/48H02J3/24H02J2300/24Y02E10/56
Inventor 高长伟律德财周璐
Owner LIAONING INST OF SCI & TECH
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