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Power grid coordination method with functions of photovoltaic power generation and electric automobile charging and discharging

A technology of electric vehicles and photovoltaic power generation, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve problems such as three-phase imbalance in the power grid, and achieve the effect of improving the voltage and loss of the power grid

Inactive Publication Date: 2018-08-28
FUZHOU UNIV
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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a grid coordination control method including photovoltaic power generation and electric vehicle charging and discharging, so as to solve the three-phase imbalance problem of the grid caused by the access of distributed power sources and electric vehicles

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  • Power grid coordination method with functions of photovoltaic power generation and electric automobile charging and discharging
  • Power grid coordination method with functions of photovoltaic power generation and electric automobile charging and discharging
  • Power grid coordination method with functions of photovoltaic power generation and electric automobile charging and discharging

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0045] The traditional three-phase inverter connected to the grid in the electric vehicle charger and photovoltaic device is changed into three single-phase inverters with a common bus, so that the traditional photovoltaic three-phase inverter and electric vehicle three-phase charging The inverter becomes a photovoltaic inverter and a three-phase balance charger, which uses three single-phase inverters to replace the traditional three-phase inverter. If the voltage is higher than a certain critical value, usually 10% higher than the rated voltage , the inverter must be disconnected. If three separate single-phase inverters are used, only the inverter connected to the overloaded phase must be disconnected. This can greatly reduce the curtailed power, allowing more power to be injected into the grid and distributed more evenly in each phase, so that photov...

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Abstract

The invention discloses a power grid coordination method with functions of photovoltaic power generation and electric automobile charging and discharging, and the method comprises the steps: enablingthree-phase inverters connected in an electric automobile charger and a photovoltaic power generation device to be respectively divided into three single-phase inverters which share one bus, and enabling the single-phase inverters to serve as three-phase balance chargers and photovoltaic inverters; and controlling the output power of the three-phase balance chargers and photovoltaic inverters through PV sag. According to the invention, a conventional three-phase inverter is changed into photovoltaic inverters and three-phase balance chargers, and a local PV sag control strategy is employed. The difference between the phase voltages is used for adjusting the power, so as to achieve the power grid balance.

Description

technical field [0001] The invention relates to the technical field of power quality, in particular to a grid coordination control method including photovoltaic power generation and charging and discharging of electric vehicles. Background technique [0002] The integration of photovoltaic power generation (PV) and electric vehicles (EV) may lead to load imbalance in the low-voltage distribution network. The voltage rise of the large amount of photovoltaic power generation may cause voltage imbalance. Voltage and current imbalance is the most serious power quality problem in low voltage distribution network. Electric vehicles have a high electrical energy demand and are therefore a considerable additional burden on the electricity distribution network. This can lead to severe voltage dips or overloading of distribution transformers. On the other hand, if the charging power of the electric vehicle is controlled, the parking time of the electric vehicle will be longer than ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26H02J3/32H02J3/38
CPCH02J3/26H02J3/32H02J3/383H02J2203/20Y02E10/56Y02E40/50Y02E70/30
Inventor 金涛卓丰李强广
Owner FUZHOU UNIV
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