A test power supply and method for a wind power generating set with energy storage and simulated load

Abstract

The invention disclose a wind turbine generating set testing power supply with the functions of energy storage and load simulation and a testing method. The testing power supply comprises an energy storage unit, a power conversion unit and a simulate resistor unit, wherein the energy storage unit comprises a lithium battery and a super capacitor; the power conversion unit comprises one or more DC / AC convertors and one or more DC / DC convertors; the DC / AC convertors and the DC / DC convertors are connected in parallel to the DC side of a major loop; the DC / AC convertors are used for converting DC output by the lithium battery connected to the DC side of the major loop into three-phase AC which is output to a transformer on the AC side of the major loop; the output ends of the DC / DC convertors are connected with the lithium battery through a fourth AC switch, connected with the super capacitor through a fifth AC switch, and connected with the simulate resistor unit through a third AC switch. The testing power supply integrates the functions of energy storage and energy discharging into a whole; due to the design of the energy storage unit, the fluctuating load adaptive capacity of the testing power supply is greatly enhanced.

Description

technical field [0001] The invention relates to the field of wind power system testing, in particular to a testing power supply and a testing method for grid-connected power generation of wind power generating sets. Background technique [0002] With the change of the world's energy pattern, wind power generation has become a hot spot for research and development in various countries. After the completion of the basic construction of the wind farm, before it is connected to the large power grid, the static and dynamic debugging of the water system, main control system, wind turbine electrical navigation system, wind power converter and other equipment must be completed to ensure that the power generation system is safe and correct after being connected to the large power grid run, reducing debugging time. Most wind farms are located in remote places with harsh environments. To complete the commissioning work before grid connection, energy storage inverters and analog resist...

AI Technical Summary

Problems solved by technology

Existing energy storage inverter power supplies mostly use a single energy storage (such as figure 1 and figure 2 shown), and some cases use DC / DC parallel hybrid energy storage (such as image 3 shown), but they did not consider the special load situation of load energy backfeeding (such as wind power converter + generator and other loads that can output power later), which limits the use of energy storage inverters in loads with large fluctuations, Applications on loads with energy feedback

[0004] The energy storage inverter power supply realized by the existing technology is generally equipped with a single energy storage unit, or realizes hybrid energy storage through multiple sets of DC / DC, but none of them is equipped with a high-power analog resistance unit

When the load power demand of the power supply system is large instantaneously, it is easy to cause damage to a single energy storage unit (if the battery protection board has insufficient current resistance value, the battery will be cut out of the system and the power supply will be shut down); when the system load has power backfeeding, if If the charging power of the energy storage unit is less than the reverse charging power, it will cause the bus voltage to rise, which will affect the service life of the power device and the energy storage unit; when the storage capacity of the energy storage unit is not enough, it must be out of operation before it can be charged. Use another set of devices or cut off the entire test power supply system and connect to the grid to charge the energy storage unit, which is time-consuming and laborious, which affects the system use efficiency and engineering efficiency

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