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Current source photovoltaic grid-connected inverter low voltage ride through control system and method

A low-voltage ride-through and control system technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problems of unable to maintain the unit power factor operation of the system, DC side current out of control, and unsuitable for three-phase current-type grid-connected inverters and other issues to achieve the effect of system unit power factor operation

Inactive Publication Date: 2019-08-13
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this low-voltage ride-through control method is not suitable for three-phase current-source grid-connected inverters. Only relying on the grid-side current limit will cause the DC-side current of the current-source grid-connected inverter to run out of control.
The existing low-voltage ride-through scheme of current-source photovoltaic grid-connected inverters is to connect capacitors in series on the grid side, but this scheme cannot maintain the unit power factor operation of the system under normal working conditions, and still cannot control the DC voltage when the grid voltage drops severely. electric current

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  • Current source photovoltaic grid-connected inverter low voltage ride through control system and method
  • Current source photovoltaic grid-connected inverter low voltage ride through control system and method

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] Combine below figure 2 The embodiments of the present invention will be further described. A low-voltage ride-through control system for a current-type photovoltaic grid-connected inverter, including a PV solar panel, an RL circuit, an inverter, a filter, a power grid, and a control system, the control system including a digital phase-locked loop, space vector modulation module, Clark transform and Park transform module, Park inverse transform module, AC control module, DC control module, the digital phase-locked loop, space vector modulation module, Clark transform and park transform module, park inverse transform module, AC control module, The DC control modules are all implemented by using software algorithms in the hardware controller. The PV solar panel, RL circuit, inverter, filter, and power grid are connected in seque...

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Abstract

The invention relates to a current mode photovoltaic grid-connected inverter low voltage ride through control method, a switching tube SW and a diode D are added to the direct current side of a three-phase current mode grid-connected inverter in the prior art, the switching tube SW is used for controlling the direct current stability when the grid voltage drops, and the diode D is used for providing a follow current path for a DC energy storage inductor. The grid voltage ug is acquired through a sensor, and a per-unit value uT of the grid voltage is calculated. In normal condition, the switching tube SW maintains normally open state, and when the uT is less than a voltage drop limiting value Uth bear by the normal mode, the inverter control mode is switched into a low voltage ride through control mode. According to the invention, the current mode grid-connected inverter is enable to have good low voltage ride through ability, the inverter can maintain the direct current stable without losing control and no overcurrent on line side when the grid voltage drops seriously, the current mode grid-connected inverter has low voltage ride through ability while realizes system unit power factor operation in the normal condition.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to a low-voltage ride-through control method for a current-type photovoltaic grid-connected inverter. Background technique [0002] With the development of my country's photovoltaic power generation industry, photovoltaic power generation technology has been in-depth research and promotion. The application technology of voltage-type inverter is relatively mature, and it has good bidirectional power transmission control capability. Therefore, most of the mainstream photovoltaic grid-connected inverters on the market are voltage-type inverters. The current-source inverter is more suitable for photovoltaic power generation systems due to its own advantages such as boosting capability, high reliability of short-circuit protection, and direct control of current. In addition, compared with the capacitor energy storage on the DC side of the voltage source...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCH02J3/383Y02E10/56
Inventor 耿乙文邓仁雄刘海卫王凯夏帅陈瑞成董文明苗加振
Owner CHINA UNIV OF MINING & TECH
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