Communication-free distributed frequency supporting method and system for photovoltaic power station

A photovoltaic power station, frequency support technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problem of limited frequency regulation ability of photovoltaic power station, and achieve the effect of improving the system frequency change rate, increasing the system inertia, and enhancing the system inertia.

Pending Publication Date: 2022-01-04
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a communication-free distributed frequency support method and sys

Method used

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  • Communication-free distributed frequency supporting method and system for photovoltaic power station
  • Communication-free distributed frequency supporting method and system for photovoltaic power station
  • Communication-free distributed frequency supporting method and system for photovoltaic power station

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Effect test

Embodiment 1

[0044] A communication-free distributed frequency support method for a photovoltaic power station, which is used to provide active frequency support for grid-connected AC systems;

[0045] Among them, the photovoltaic power station includes a photovoltaic array; the photovoltaic array includes a plurality of parallel photovoltaic strings; the photovoltaic string includes a plurality of series-connected photovoltaic power generation units; the photovoltaic power generation unit includes interconnected photovoltaic modules and DC optimizers; In the stage, each photovoltaic power generation unit in the photovoltaic array is controlled by the DC optimizer in the load shedding mode, leaving a certain reserve power to meet the frequency regulation requirements of the grid-connected AC system;

[0046] It should be noted that the photovoltaic power station targeted by the present invention is a distributed photovoltaic power station including a large-scale DC optimizer (also called a ...

Embodiment 2

[0082] A photovoltaic power station without communication distributed frequency support system, wherein the photovoltaic power station includes a photovoltaic array; the photovoltaic array includes a plurality of parallel photovoltaic strings; the photovoltaic string includes a plurality of series connected photovoltaic power generation units; and DC optimizer; in the normal operation stage of the photovoltaic grid-connected system, each photovoltaic power generation unit in the photovoltaic array is controlled by the DC optimizer in the load shedding mode, leaving a certain reserve power to meet the frequency regulation of the grid-connected AC system need;

[0083] The non-communication distributed frequency support system of the photovoltaic power station includes: a frequency support controller, which is used to execute step S1 in the frequency support method provided in Embodiment 1 of the present invention when the photovoltaic grid-connected system generates frequency fl...

Embodiment 3

[0099] A machine-readable storage medium, the machine-readable storage medium stores machine-executable instructions, and when the machine-executable instructions are called and executed by a processor, the machine-executable instructions cause the processor to implement the present invention. The communication-free decentralized frequency support method for a photovoltaic power station provided in Embodiment 1 of the invention.

[0100] The relevant technical solutions are the same as those in Embodiment 1, and will not be repeated here.

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Abstract

The invention discloses a photovoltaic power station communication-free distributed frequency support method and system, which are used for providing active frequency support for an alternating current system. The method is realized based on a virtual inertia strategy, and specifically comprises the following steps: deploying frequency deviation-based direct current bus voltage outer loop control in a control system of a grid-connected inverter, generating additional inertia response by using electric energy stored by a direct current bus capacitor, increasing system inertia, converting power grid frequency deviation information into change of direct current bus voltage, and realizing the communication-free frequency control; besides, deploying distributed virtual inertia control based on a direct-current optimizer, so the standby power of the photovoltaic module is fully and adaptively utilized, the active power output of each photovoltaic power generation unit is dynamically adjusted according to the voltage change caused by the frequency deviation, the inertia response similar to that of a synchronous generator is simulated, and the system inertia is further improved. The utilization efficiency of frequency modulation standby power of a large-scale photovoltaic power station can be improved, and the frequency index of an alternating current system is improved.

Description

technical field [0001] The invention belongs to the technical field of new energy grid-connected power generation, and more specifically relates to a communication-free decentralized frequency support method and system for a photovoltaic power station. Background technique [0002] In recent years, with the increasing proportion of photovoltaic power generation in the power system, the decentralized maximum power point tracking technology based on DC optimizer (DCO) has received extensive attention. This technology can effectively reduce the local shadowing of large-scale photovoltaic arrays. Energy loss in the case of shading improves the power generation efficiency of the photovoltaic system. Facing the development trend of power system where new energy power generation gradually dominates, large-scale distributed photovoltaic power plants based on DCO are expected to become the main means of large-scale photovoltaic grid-connected power generation in the future. However,...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/48H02J3/24H02J3/12H02J3/36
CPCH02J3/381H02J3/48H02J3/24H02J3/12H02J3/36H02J2203/20H02J2300/24H02J2300/40Y02E10/56Y02E60/60
Inventor 姚伟王钦许梦瑶方家琨艾小猛文劲宇
Owner HUAZHONG UNIV OF SCI & TECH
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