Megawatt wind power storage battery combined independent power supply system

Abstract

The invention relates to a megawatt wind power storage battery combined independent power supply system, which comprises a plurality of wind turbines, a storage battery energy storage regulation system, a plurality of storage battery packs, an external standby power supply and unload charges, wherein the output ends of the wind turbines are connected with a high-voltage main bus; the storage battery energy storage regulation system comprises a plurality of charge and discharge management systems and a system main monitor, wherein the alternating current side of each charge and discharge management system is connected with the high-voltage main bus after the alternating current side is connected with a public bus, and the system main monitor conducts information interaction with the charge and discharge management systems through a plurality of CAN interfaces and works according to the commands of the charge and the discharge management systems; each storage battery pack is connected with the direct current end of the corresponding charge and discharge management system and conducts bidirectional regulation of active power and reactive power jointly with PCC points formed by the high-voltage main bus and the storage battery energy storage regulation system within the voltage range from the upper limit to the lower limit to enable the voltage and the frequency of the PCC points to be stable; the external standby power supply supplies power to the high-voltage main bus under the control of the system main monitor in the storage battery energy storage regulation system to enable the voltage and the frequency of the PCC points to be stable; and the unloading charges are used to consume the power output by the high-voltage main bus under the control of the system main monitor in the storage battery energy storage regulation system to enable the voltage and the frequency of the PCC points to be stable.

Description

technical field [0001] The invention relates to a power supply system, in particular to a megawatt-level wind power storage battery combined independent power supply system. Background technique [0002] my country's power grid is still unable to cover all regions of the country, such as remote areas, offshore oil field platforms, etc. This is because long-distance power transmission will not only cause a lot of power loss, greatly increase costs, but also be very difficult to achieve. As we all know, offshore and some remote areas are rich in wind resources. If wind resources can be effectively utilized and an independent power supply system can be established, the difficult problem of "island power grid" power supply can be well solved. However, due to the intermittent, fluctuating and uncontrollable characteristics of wind energy, a battery energy storage regulating device is needed to balance the fluctuation of the wind power of the fan, so as to stabilize the output vol...

AI Technical Summary

Problems solved by technology

As far as the existing technologies are concerned, the kilowatt-level wind power generation (hereinafter referred to as wind power) battery-combined independent power supply system has been widely used, while the megawatt-level wind power battery independent power supply system has not yet existed, and the kW-level to megawatt-level The voltage and frequency fluctuations of wind power independent systems are increasing, and the voltage and frequency stability control of the system is facing greater challenges. More superior control methods and reasonable system structures are needed to ensure system stability.

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