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Primary frequency modulation control method and device of photovoltaic virtual synchronous machine

A technology of virtual synchronous machine and control method, which is applied in the field of electric power, can solve problems such as disappearance, and achieve the effect of reducing the hidden danger of power disappearance

Active Publication Date: 2018-09-28
NORTH CHINA ELECTRICAL POWER RES INST +3
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Problems solved by technology

like figure 2 As shown, when the grid frequency drops, only the energy storage side supports power in response to primary frequency regulation, and the maximum power is 10% P N , even if the photovoltaic power has available capacity, it will not participate in frequency regulation; when the energy storage system is exhausted, the primary frequency regulation power disappears, the secondary frequency regulation has not responded, and the grid frequency has a secondary drop

Method used

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  • Primary frequency modulation control method and device of photovoltaic virtual synchronous machine
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  • Primary frequency modulation control method and device of photovoltaic virtual synchronous machine

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Embodiment Construction

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0037] The current photovoltaic virtual synchronous machine control strategy mainly considers that when the maximum available power of the photovoltaic power source is insufficient, if it still needs to meet the system power demand, the power supply is provided by the energy storage unit to make up for the power difference, and the capacity of the energy storage unit In the non-operating interval and the photovoltaic power supply has a certain reserve capacity, the frequency regulation control strategy is insufficiently considered. Based on this consideration, an embo...

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Abstract

The invention provides a primary frequency modulation control method and device of a photovoltaic virtual synchronous machine. The method comprises the steps of receiving a frequency fall signal indicating that a power grid falls from a stable running frequency to a first frequency; and responding to the frequency fall signal, coordinating by using a photovoltaic energy storage unit and a photovoltaic power supply based on the photovoltaic virtual synchronous machine, so as to provide a support power to perform primary frequency modulation on the power grid. According to the method, the photovoltaic energy storage unit and the photovoltaic power supply coordinate to provide the support power, so that the photovoltaic power is fully utilized, and the hidden trouble of loss of the primary frequency modulation power is avoided.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method and device for controlling primary frequency modulation of a photovoltaic virtual synchronous machine. Background technique [0002] With the development of new energy technologies and industries, the proportion of photovoltaic and other new energy power generation in the power grid is gradually increasing. Since photovoltaic power stations generally use power electronic inverters to connect to the grid, compared with traditional power generation equipment (such as synchronous generators), inverters have advantages such as rapid control response and flexible control, but there are many defects at the same time, for example, Lack of inertia and damping, can not respond to a frequency modulation, voltage regulation. This has led to traditional energy sources such as thermal power taking on almost all the primary frequency regulation and peak regulation tasks of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/24H02J3/48
CPCH02J3/24H02J3/385H02J3/48H02J2203/20Y02E10/56
Inventor 葛俊巩宇李智宋鹏刘辉江浩刘汉民
Owner NORTH CHINA ELECTRICAL POWER RES INST
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