Optical storage networking system control method and application device thereof
A networked system and control method technology, applied in the field of energy storage, can solve problems such as output power fluctuations, backflow, and system stability, and achieve the effect of preventing power backflow and improving operation stability
Pending Publication Date: 2021-09-03
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology
[0004] However, since the output power of the photovoltaic inverter system is significantly affected by weather factors, fluctuations in the output power often occur in practical applications, which not only may cause the output power to flow backward to the energy storage system, but also seriously affect the stability of the system operation.
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[0080] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.
[0081] In practical applications, especially in figure 1 In the photovoltaic-storage networking system shown, the output end of the photovoltaic inverter is connected to the AC busbar, and the photovoltaic inverter will detect the frequency of the AC voltage on the AC busbar it is connected to, and calculate the output power according to the preset AC voltage frequency and output power. The corresponding relationship, adjust its own output power, this is the over-frequency derating function...
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The invention provides a optical storage networking system control method and the application device thereof provided by the invention and is applied to the technical field of energy storage. The method comprises steps of an energy storage converter obtaining absorbable power of the energy storage converter and pre-stored target parameters of a photovoltaic inverter under the condition that the energy storage converter does not need to perform operation mode switching and is in an off-grid mode; calculating a target frequency according to the absorbable power and a target parameter, and then outputting an inversion voltage according to the target frequency, and a photovoltaic inverter connected to an off-network port of the energy storage converter can detect the inversion voltage of the target frequency, thereby executing an over-frequency derating function, and outputting an output power corresponding to the obtained target frequency. The method is advantaged in that control of the output power of the photovoltaic inverter is realized, the power is prevented from flowing backwards, and operation stability of the optical storage networking system is improved.
Description
technical field [0001] The invention relates to the field of energy storage technology, in particular to a control method and an application device for an optical storage networking system. Background technique [0002] see figure 1 , figure 1 It shows a structural block diagram of a photovoltaic-storage networking system in the prior art, which includes a photovoltaic inverter system and an energy storage system that operate in parallel, wherein the photovoltaic inverter system is connected in series with photovoltaic modules and photovoltaic inverters, and the energy storage The system includes photovoltaic modules, energy storage batteries and energy storage converters. The photovoltaic modules and energy storage batteries are respectively connected to the DC side of the energy storage converter. The AC side of the energy storage converter is provided with a grid-connected port and an off-grid port. , the grid-connected port of the energy storage converter is connected ...
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Login to View More IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/381H02J3/388H02J3/32H02J2300/24Y02E70/30Y02E10/56
Inventor 徐金城俞雁飞耿后来李星田象石
Owner SUNGROW POWER SUPPLY CO LTD