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Distributed photovoltaic power station user side three-phase imbalance counter-current prevention device and method

A distributed photovoltaic and reverse current prevention technology, which is applied in photovoltaic power generation, circuit devices, multi-phase network asymmetry reduction, etc., can solve the problems of reverse current back to the grid energy loss, the impact of system security and stable operation, etc., to avoid energy loss , Alleviate the power supply pressure of the power grid, and solve the effect of energy loss

Pending Publication Date: 2018-10-02
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

Since the inverter of distributed photovoltaic power generation outputs forcedly balanced three-phase power at the maximum power, when there is an unbalanced load on the user side, it will cause a phase or two-phase current on the load side to flow back to the grid to cause energy loss, and at the same time, the system will be damaged. affect the safe and stable operation of

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  • Distributed photovoltaic power station user side three-phase imbalance counter-current prevention device and method
  • Distributed photovoltaic power station user side three-phase imbalance counter-current prevention device and method
  • Distributed photovoltaic power station user side three-phase imbalance counter-current prevention device and method

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Embodiment Construction

[0034] In order to make the working principle and technical solution of the present invention clearer and more intuitive, preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Apparently, the specific examples described are only used to explain the present invention, not to limit the present invention.

[0035] The example of the present invention provides a three-phase unbalanced backflow prevention device on the user side of a distributed photovoltaic power station. The overall structural block diagram of the system is as follows figure 1 As shown, since the load imbalance always exists, the controllable device and the energy storage system are combined on the load side to form an anti-backflow device. The device includes a three-phase rectification circuit connected in parallel with the user load side of the distributed photovoltaic power station, a bidirectional DC-DC conversion circuit, an energy st...

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Abstract

The invention discloses a distributed photovoltaic power station user side three-phase imbalance counter-current prevention device and method. The counter-current prevention device is composed of a rectified three-phase circuit, a bidirectional DC-DC conversion, an energy storage battery and a microprocessor connected in parallel at the load side; an incoming line end of the rectified three-phasecircuit is connected with an outgoing line end of a photovoltaic inverter, and the outgoing line end thereof is orderly connected with the bidirectional DC-DC conversion circuit and the energy storagebattery to form a charging main loop of the imbalance current; the outgoing line end of the rectified three-phase circuit is connected with the incoming line end of the inverter through a contactor switch so as to form a battery discharging loop; the microprocessor realizes the charging / discharging control on the battery by driving the rectified three-phase circuit, the contactor switch and the DC-DC circuit switch tube. The distributed photovoltaic power generation and the battery energy storage system are combined, the problem of the countercurrent power of the current caused by the three-phase load imbalance at the user side is solved by connecting the energy storage system in parallel at the load side, and the safe, stable and economic operation of the system is effectively guaranteed.

Description

technical field [0001] The invention belongs to the technical field of distributed photovoltaic power plants, and specifically relates to a battery energy storage-based backflow prevention device and control method suitable for distributed photovoltaic power plants under the condition of unbalanced three-phase load on the user side. Background technique [0002] Distributed photovoltaic power generation is composed of photovoltaic arrays, combiner boxes and inverters composed of multiple photovoltaic modules connected in series and parallel. It is a new energy generation technology with broad development space, which can convert solar energy into electrical energy for load usage. Distributed photovoltaic power generation operates in the way of self-consumption on the user side and excess power on the grid. It advocates the principles of nearby power generation, nearby grid connection, nearby conversion, and nearby use. Due to the unpredictability and volatility of the outpu...

Claims

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Application Information

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IPC IPC(8): H02J3/32H02J3/26H02J3/38
CPCH02J3/383H02J3/26H02J3/32Y02E40/50Y02E70/30Y02E10/56
Inventor 孟彦京杜鹃马汇海李双双荣为青张君燕李宏涛
Owner SHAANXI UNIV OF SCI & TECH
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