A voltage regulation method for terminal photovoltaic grid-connected farmers based on power spring technology
An electric spring and voltage regulation technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problems of key loads at the user end of voltage fluctuations, but can not solve the problems of voltage fluctuations at the user end, so as to avoid adverse effects, easy to implement, and adjust high precision effect
Pending Publication Date: 2019-01-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
However, the existing power spring solution mainly solves the impact of the voltage fluctuation of the power grid at the source end on the key load of the user end, and cannot solve the problem of voltage fluctuation caused by the reverse power transmission from the user end to the grid.
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[0036] 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 of the embodiments of the present invention, not all of them.
[0037] The purpose of the present invention is to provide a voltage regulation method for terminal photovoltaic grid-connected farmers based on electric spring technology. O Adjust the size of the ESD to send or absorb reactive power to maintain the terminal voltage of the farmer's power load, and avoid the adverse effects of photovoltaic output fluctuations on the farmer's power load.
[0038] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0039] figure 1 In...
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The invention discloses a voltage regulation method of terminal photovoltaic grid-connected farmers based on the electric spring technology. The connection mode is that each photovoltaic farmer's electric load is connected in series with an electric spring device, and all photovoltaic farmers are connected to the distribution network through low-voltage electric lines. The terminal voltage stability of all farm households' electric load is realized through independent regulation of each electric spring device, The control method comprises the following steps: when a photovoltaic grid-connectedfarmer transmits power to a power network backwards, thereby causing the terminal voltage of the farmer to be too high, the voltage regulation method maintains the terminal voltage stability of the power load of the farmer by adjusting the reactive power absorbed by the power spring device; When a photovoltaic grid-connected farmer (insufficient photovoltaic output) extracts power from a power grid and causes a low voltage at the farmer's end, the voltage regulation method maintains the terminal voltage stability of the farmer's electric load by adjusting the reactive power emitted by the electric spring device. The voltage regulating method enables the terminal voltage amplitude of the electric load of the farmer household to be firmly limited within a prescribed range.
Description
technical field [0001] The invention relates to the technical field of grid-connected new energy sources, in particular to a voltage regulation method for end photovoltaic grid-connected farmers based on electric spring technology. Background technique [0002] Photovoltaic poverty alleviation is mainly to lay solar panels on the roofs of houses and agricultural greenhouses, "spontaneous self-use, surplus to the Internet". That is, farmers can use the electricity themselves and sell excess electricity to the national grid. However, in remote rural areas, when the grid is connected to the grid, the voltage is often too high, which not only causes a fault alarm due to the high voltage, but also causes the inverter to shut down for protection. This often occurs and affects the photovoltaic revenue. [0003] In this kind of situation, the staff will generally look for the cause in the inverter. The usual method is: relax the protection voltage range (you can relax the factory A...
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Login to View More IPC IPC(8): H02J3/38
CPCH02J3/383Y02B10/10Y02E10/56
Inventor 颜湘武贾焦心吕佳伟崔扬王德胜
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)