The Energy Storage Power Station, Photovoltaic Shall Have Primary Frequency Modulation Capability
The Latest National Standard of Technical Regulations and Test Guidelines for Primary Frequency Modulation of Grid Connected Power Sources (GB / t40595-2021) .It is required that the energy storage power station, photovoltaic, wind power, etc. shall have primary frequency modulation capability
Recently, the national standard technical regulations and test guidelines for primary frequency modulation of grid connected power sources (GB / t40595-2021) was officially released, which clearly requires that energy storage power stations, photovoltaic and wind power plants should have primary frequency modulation capability, and will be implemented from May 1, 2022.
The document further details the requirements for primary frequency regulation of various power supplies. For the energy storage power stations with 35kV and above voltage levels connected to the grid, the primary frequency regulation dead band is set at ± 0.03hz ~ ± 0.05Hz. In principle, there is no limit on the power change, and if necessary, the limit is not less than 20% of the rated active power. The primary frequency regulation difference rate is 0.5% ~ 3%. At the same time, it shall have the primary frequency regulation ability under the state of charge or discharge.
The so-called primary frequency modulation function is the function of grid connected generator units to spontaneously participate in grid stability mediation in time when grid frequency fluctuates.
With the increasing installed scale of new energy and the increasing penetration rate of new energy year by year, it has become a general trend for new energy stations to have primary frequency modulation capability.
The previously issued technical code for power system network source coordination (DL / t1870-2018) clearly requires that wind farms and photovoltaic power stations should have primary frequency modulation function, which can be realized by retaining active power standby or configuring energy storage equipment, and using active power control system or installing independent devices.
The national standard guidelines for the safety and stability of power systems (gb38755-2019) also requires that wind power, photovoltaic and energy storage connected to the grid with voltage levels of 35kV and above shall have primary frequency modulation function.
In addition, power grid companies in at least 16 provinces have also issued relevant documents requiring new energy stations to have primary frequency modulation capacity, and provinces that have not issued separate documents have also put forward corresponding requirements in the "two rules".
As primary frequency modulation will become a necessary "skill" for new energy stations, the voice of adding energy storage devices is becoming higher and higher.
This is mainly because the energy storage system is superior to the traditional thermal power unit in technical parameters such as response time, and the system has obvious advantages in short-term frequency characteristics and steady-state frequency. At the same time, the energy storage system can also reduce waste air in subsequent operation, has smooth output capacity, and has no risk of frequency secondary drop.