New Energy

New energy primary frequency modulation controller

As large-capacity and high-proportion new energy sources are intensively connected to the power grid, the power supply structure undergoes major changes, and the fast frequency response resources available to the power grid are gradually reduced. At the same time, the scale of large-scale new energy bases continues to expand through UHV DC transmission. If there is a large-scale Power DC blockage will pose a serious threat to the frequency security of the power grid. The frequency regulation pressure and safe operation risks of the power grid continue to increase. There is an urgent need for new energy to participate in the rapid frequency response of the power grid and improve the level of frequency risk prevention and control of large power grids. New energy fast frequency response products should be put into use. And born.

The primary frequency regulation function of new energy stations participating in the power grid is used to control the output active power characteristics of new energy stations and simulate the primary frequency regulation characteristics of traditional thermal power generating units. Further exploring the control potential of converters for new energy stations to provide fast and accurate active power support after system frequency disturbances to meet the needs of safe operation of the power grid will increase the penetration rate of new energy units and ensure the reliability of the power system. Stable operation is of great significance.

In August 2018, the Northwest Regulatory Bureau of the National Energy Administration officially issued a policy document to promote large-scale commercial use of fast frequency response of new energy. Subsequently, Yunnan, Central China, North China Energy Regulatory Bureau, and China Southern Power Grid successively issued documents requiring that new energy power stations must have fast frequency response. Function.

Topology

Photovoltaic power plant topology

Wind farm primary frequency modulation

Product Features

It is suitable for photovoltaic power stations and wind power stations. When the system frequency deviates, it can complete the primary frequency modulation response of the system according to the established curve: when the frequency rises, it can actively reduce the active power output; when the frequency drops, it can actively increase it under power limitation. power.

Technical Parameters

The new energy primary frequency modulation controller is designed according to the DL/T 1870 standard, and its implementation performance is higher than the standard requirements. See Table 1 for a comparison of specific frequency modulation parameter indicators.

Comparison of primary frequency modulation parameter indicators
No.	Indicator name	Product indicators	Grid requirements (indicator requirements)
1	Response latency	0.21s	2s
2	Response time	1.51s	5s
3	Adjustment time	1.51s	15s
4	FM control deviation	0.8%	1%
5	Frequency accuracy	0.001Hz	0.003Hz
6	Frequency sampling period	0.01s	0.1s
7	Control cycle	0.01s	1s