Control method for adjusting photovoltaic grid-connected inverter input power according to power grid voltage

A technology of grid voltage and control method, applied in photovoltaic power generation, measurement of electrical variables, measurement of resistance/reactance/impedance, etc., can solve the problems of not considering new energy access, limitations, large capital investment, etc.

Active Publication Date: 2016-10-12
天津科林电气有限公司
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Problems solved by technology

However, the distribution network involves a relatively large area, and the original plan may not have considered the access of new energy sources, due to the limitations of existing transformer capacity and other power distribution equipment.
Renovation requires a relatively long period and a large capital investment, and cannot quickly resolve the current contradiction

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  • Control method for adjusting photovoltaic grid-connected inverter input power according to power grid voltage
  • Control method for adjusting photovoltaic grid-connected inverter input power according to power grid voltage
  • Control method for adjusting photovoltaic grid-connected inverter input power according to power grid voltage

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Embodiment Construction

[0031] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0032] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention based on specific situations.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0034] Such as figure 2Shown i...

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Abstract

The invention provides a control method for adjusting photovoltaic grid-connected inverter input power according to power grid voltage. The control method includes a first control state and a second control state. The first control state refers to MPPT state control, the maximum power point of a solar cell panel component is corresponding to be near voltage Umax, and output power is near the maximum output power point Pmax so that energy acquired by the MPPT controller part is enabled to be pushed to the power grid in an inverted way; and the second control state refers to limit power state control, the inverter working point is enabled to deviate from the maximum output power point Pmax so that voltage drop of inverter output current on line impedance is enabled to be reduced. The beneficial effects are that the problem of voltage limit exceeding of distributed photovoltaic power generation accessing under the condition of a weak power distribution network can be solved, shutdown and light abandoning caused by excessive high voltage of the power grid can be reduced and user benefits can be guaranteed; meanwhile, the line impedance can be estimated, and the inverter can control user load at the site or through remote monitoring according to the line impedance so that no light abandoning can be basically realized.

Description

technical field [0001] The invention belongs to the field of photovoltaic grid-connected inverters, and in particular relates to a control method for adjusting input power of a photovoltaic grid-connected inverter according to grid voltage. Background technique [0002] With the continuous development of photovoltaic power generation technology, the cost of photovoltaic power generation is gradually reduced. The continuous improvement of new energy grid-connected subsidy policies has further promoted the development of the entire industry. At present, distributed photovoltaic power generation has entered thousands of households. Users can install a solar power generation system on their roofs and earn income by selling electricity. When installing solar power generation systems in rural or remote areas, it is often encountered that the grid voltage exceeds the limit, that is, the grid voltage at the grid-connected point exceeds the allowable operating range of the inverter ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38G01R27/02
CPCG01R27/02H02J3/385Y02E10/56
Inventor 张虎祥赵治国尹伟张楠李会冬
Owner 天津科林电气有限公司
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