Frequency modulation method and system based on photovoltaic virtual synchronous generator
A virtual synchronization and generator technology, applied in the field of power systems, can solve the problems of insufficient active power support of new energy power stations, affecting the frequency regulation accuracy of grid-connected points, etc., and achieve the effect of increasing the active power support amount of frequency regulation and improving the frequency regulation accuracy.
Active Publication Date: 2020-10-13
ELECTRIC POWER RES INST STATE GRID JIBEI ELECTRIC POWER COMPANY +2
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[0003]Although the photovoltaic virtual synchronous generator can provide active power support for primary frequency regulation in the grid-connected mode, there are various The new energy power station is faced with insufficient active power support due to the loss between the machine terminal and the grid connection point, which in turn affects the frequency adjustment accuracy of the grid connection point
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[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0025] Those skilled in the art know that the embodiments of the present invention can be implemented as a system, device, device, method or computer program product. Therefore, the present disclosure may be embodied in the form of complete hardware, complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.
[0026] In view of the lack of active power support in the prior art, which affects the frequ...
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The invention provides a frequency modulation method and system based on a photovoltaic virtual synchronous generator. The frequency modulation method based on the photovoltaic virtual synchronous generator comprises the following steps: determining the active loss from the machine end of the photovoltaic virtual synchronous generator to a grid-connected point and the actual frequency modulation active support quantity of the grid-connected point before optimization; determining an optimized grid-connected point theoretical frequency modulation active support quantity according to the active loss and the grid-connected point actual frequency modulation active support quantity before optimization; and performing frequency modulation optimization on the photovoltaic virtual synchronous generator according to the optimized grid-connected point theoretical frequency modulation active support quantity. The frequency modulation active support quantity and the frequency modulation precision of the grid-connected point can be improved.
Description
technical field [0001] The present invention relates to the technical field of power systems, in particular to a method and system for frequency regulation based on a photovoltaic virtual synchronous generator. Background technique [0002] In order to meet the needs of sustainable development of resources, new energy represented by photovoltaics and wind power has developed rapidly, and the proportion of new energy output in some areas has exceeded 50%. Compared with traditional generator sets, photovoltaic equipment has almost no rotational inertia and damping components, and cannot spontaneously respond to frequency changes like synchronous machines. It usually does not have the primary frequency modulation capability similar to synchronous machines, and a large number of connections will affect the dynamics of the power system. Support and stability. In recent years, the photovoltaic virtual synchronous generator technology that simulates the rotor motion equation of th...
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IPC IPC(8): H02J3/24
CPCH02J3/241Y02E10/56
Inventor 巩宇邵尹池刘辉宋鹏王晓声
Owner ELECTRIC POWER RES INST STATE GRID JIBEI ELECTRIC POWER COMPANY