Fusion system of phase modifier and in-station energy storage of new energy power station

Abstract

The embodiment of the invention provides a new energy power station phase modifier and in-station energy storage fusion system which comprises a phase modifier and an energy storage system which are arranged in a new energy power station, and the fusion system comprises an energy storage independent excitation mode, an energy storage excitation and self-shunt excitation complementary mode, an energy storage independent starting mode and an energy storage standby starting mode. The phase modifier and the energy storage system in the new energy power station can be effectively fused, the reliability of the phase modifier equipment and the utilization rate of the energy storage system are improved, and the supporting effect of the phase modifier on the new energy power grid is fully exerted.

Description

technical field [0001] The present application relates to the field of new energy power systems, and in particular to a fusion system of a new energy power station controller and in-station energy storage. Background technique [0002] New energy power generation, such as the power system (wind power photovoltaic) with new energy as the main body, will become the main power source in the future power system. Insufficient short-circuit capacity and other problems, as a synchronous motor, the synchronous camera has the advantages of strong transient inactive power, large moment of inertia, and large short-circuit capacity. A proven solution. Due to the volatility and intermittency of wind and solar power, the frequency regulation and peak regulation performance of the power grid is poor, and energy storage has gradually become the standard for new wind farms and photovoltaic power plants, especially electrochemical energy storage. The camera and energy storage respectively s...

AI Technical Summary

Problems solved by technology

However, in the self-shunt static excitation mode adopted in the prior art, when the grid voltage drops, the primary side voltage of the excitation transformer also drops to a large extent, which is equivalent to that the power supply voltage of the excitation system is much lower than the normal level. It is still required to output a higher amplitude DC voltage, which indirectly puts forward higher requirements on the capacity and voltage level of the excitation system, increases the complexity of the system, and affects the dynamic performance of the excitation system, especially for new energy. In the weak power grid scenario of the station, it is impossible to give full play to the strong excitation effect of the condenser

In addition, because the excitation power comes from the machine end and is coupled with the condenser, it cannot provide 100% reliability support in essence. For example, when the excitation system fails, there is no corresponding backup excitation power supply.

[0007] 2. When the SFC device (static start frequency converter) is used to start the condenser, the starting power comes from the station AC system. Using frequency conversion to start will cause harmful effects such as harmonic pollution and current impact on the station power system. In addition, when the system When the power is lost, the SFC will not be able to start the condenser, making it difficult to restore the system voltage

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