Photovoltaic grid-connected automatic voltage stabilization control device and method

An automatic voltage stabilization and control device technology, applied in photovoltaic power generation, circuit devices, control/regulation systems, etc., can solve problems such as voltage instability at grid-connected points, and achieve low cost, simple and feasible principles, and small volume

Active Publication Date: 2021-09-07
SHANDONG LUNENG SOFTWARE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of unstable voltage at grid-connected points caused by a large number of photovoltaic grid-connected grids in stable rural power grids, the present invention automatically switches on and off bidirectional thyristors by comparing the voltages on the grid side and the user side, and changes the input and output ends of the AC-AC. It can feed back to the power grid when the voltage at the user end rises, and it can be supplemented in time when the voltage drops, so as to achieve the purpose of stabilizing the voltage

Method used

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  • Photovoltaic grid-connected automatic voltage stabilization control device and method
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  • Photovoltaic grid-connected automatic voltage stabilization control device and method

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Embodiment 1

[0034] Embodiment 1. This embodiment provides a photovoltaic grid-connected automatic voltage stabilization control device.

[0035] figure 1 It is the overall structural diagram of the photovoltaic grid-connected automatic voltage stabilization control device of this embodiment, as figure 1 As shown, a photovoltaic grid-connected automatic voltage stabilization control device, the input end of the device is connected to the live wire and neutral wire on the grid side, and the output side is connected to the user end. The device includes a voltage regulation circuit and its corresponding controller and Switching control circuit; the controller is used to control the power switch tube in the voltage regulation circuit through the pulse signal, the voltage regulation circuit includes a boost circuit and a step-down circuit, when the grid side voltage is lower than the regulated voltage, the switching The control circuit controls the step-up circuit to work, otherwise controls t...

Embodiment 2

[0049] Embodiment 2, based on the same inventive concept, this embodiment provides a photovoltaic grid-connected automatic voltage stabilization control method;

[0050] A photovoltaic grid-connected automatic voltage stabilization control method, specifically:

[0051] The voltage regulating circuit has the function of bidirectional flow of energy. When the power is transmitted from A to B, the voltage regulating circuit is a boost circuit for transmission from B to A, and the voltage regulating circuit is a buck step-down circuit. If the power grid is connected to the A terminal, On the B side of the user side, the voltage of the network test is always greater than or equal to the voltage of the user side, which can realize the voltage stability of the user side; It is also possible to achieve voltage stabilization on the user side.

[0052] Such as Figure 5 Shown is the working flow chart of the automatic voltage stabilizing device when it is powered on and started, spec...

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PUM

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Abstract

The invention discloses a photovoltaic grid-connected automatic voltage stabilization control device, the input end of the device is connected to a power grid side, the output side of the device is connected to a user side, and the device comprises a voltage regulation circuit and a controller and a switching control circuit corresponding to the voltage regulation circuit; the controller is used for controlling a power switch tube in the voltage regulation circuit through a pulse signal, the voltage regulation circuit comprises a booster circuit and a step-down circuit, when the network side voltage is lower than the stabilized voltage, the switching control circuit controls the booster circuit to work, otherwise, the step-down circuit is controlled to work, and no matter whether the network voltage is high or low, the voltage of the user side can be stabilized.

Description

technical field [0001] The invention relates to the field of power generation grid-connected control, and more specifically relates to a photovoltaic grid-connected automatic voltage stabilization control device and method. Background technique [0002] With the development of photovoltaic power generation, the number of photovoltaic installations in rural areas has increased greatly, and a large number of photovoltaic inverters have been connected to the grid. Due to the great influence of sunlight on photovoltaic power generation, there is uncertainty in the amount of power generation. At the same time, there is line impedance in the transmission line, resulting in There is a risk that the voltage at the grid-connected point will increase or decrease, and this problem is particularly prominent in rural areas caused by photovoltaic grid-connected. [0003] To solve this problem, the prior art adopts the method of incorporating the transformer, or connects the inverter power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/12H02M3/158
CPCH02J3/381H02J3/12H02M3/1582H02J2300/28Y02E10/56
Inventor 谭春晓刘爱忠唐亮孙永亮陈立勇贾增东刘雷孟凡培李静谭宇东
Owner SHANDONG LUNENG SOFTWARE TECH
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