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Positive and negative sequence component separation method of low-voltage ride-through control of photovoltaic grid-connected inverter

A low-voltage ride-through and inverter technology, which is applied in photovoltaic power generation, single-grid parallel feeding arrangement, etc., can solve the problems of complex realization process and large calculation amount of software algorithm, achieve strong practicability and realize low-voltage ride-through control. Effect

Inactive Publication Date: 2014-12-10
XIAN UNIV OF TECH
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  • Description
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  • Application Information

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Problems solved by technology

However, the implementation process of the above method is relatively complicated, and the calculation amount of the software algorithm is large.

Method used

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  • Positive and negative sequence component separation method of low-voltage ride-through control of photovoltaic grid-connected inverter
  • Positive and negative sequence component separation method of low-voltage ride-through control of photovoltaic grid-connected inverter
  • Positive and negative sequence component separation method of low-voltage ride-through control of photovoltaic grid-connected inverter

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Embodiment Construction

[0022] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0023] Such as figure 1 As shown, the input terminal of the voltage positive sequence and negative sequence component extraction unit is connected to the output terminal of the three-phase voltage detection unit and the output terminal of the genlock unit; the input terminal of the current positive sequence negative sequence component extraction unit is respectively connected to the three-phase current The output terminal of the detection unit and the output terminal of the genlock unit are connected; the input terminal of the genlock unit is respectively connected with the output terminal of the three-phase voltage detection unit and the two output terminals of the genlock unit; the input terminal of the current control unit They are respectively connected to the output terminal of the voltage positive sequence and negative sequence component extraction unit a...

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Abstract

The invention discloses a positive and negative sequence component separation method of low-voltage ride-through control of a photovoltaic grid-connected inverter. The positive and negative sequence component separation method of the low-voltage ride-through control of the photovoltaic grid-connected inverter is characterized by comprising the following steps of obtaining three-phase voltage instantaneous values and three-phase current instantaneous values through detection of voltage and current of a power gird, obtaining output signals which are a voltage synchronous phase angle sine value and a voltage synchronous phase angle cosine value of the power grid, and output signals which are a current synchronous phase angle sine value and a current synchronous phase angle cosine value of the power grid through processing of a synchronous phase locking unit, obtaining three-phase reference voltages of the photovoltaic grid-connected inverter according to four obtained voltage positive and negative sequence components, four obtained current positive and negative sequence components and four current positive and negative sequence component set values which are set according to output power of a photovoltaic cell panel through a current control unit, and obtaining a PWM switching signal corresponding to the three-phase inverter according to the three-phase reference voltages and bipolar triangle carrier signals through a PWM wave generating unit to achieve the low-voltage ride-through control of the photovoltaic grid-connected inverter. The positive and negative sequence component separation method of the low-voltage ride-through control of the photovoltaic grid-connected inverter is simple and reliable in method and good in practicability.

Description

Technical field [0001] The invention belongs to the technical field of smart grid voltage control, and relates to a method for separating positive and negative sequence components for low voltage ride-through control of a photovoltaic grid-connected inverter. Background technique [0002] As the installed capacity of photovoltaic grid-connected power generation systems increases year by year, when the grid voltage is unbalanced or the AC system has an asymmetric fault, a large number of negative sequence components and non-characteristic harmonics will be generated on both AC and DC sides of the converter station. The lighter weight will cause the system failure protection action, and the heavy weight will seriously threaten the safety of the converter device and endanger the stability and reliability of the three-phase power grid. Therefore, when a short-circuit fault in the power grid causes a voltage drop, it is necessary to solve the problem of how to adopt corresponding cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 安少亮孙向东张琦王建渊宋卫章
Owner XIAN UNIV OF TECH
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