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Full-scale testing of the primary frequency control conducted at Zaporizhzhya NPP Unit 2 has shown a good result

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30.04.2020

Full-scale tests took place at Zaporizhzya  Unit 2 to check whether it would be possible to operate in the mode of rated primary frequency control while working in parallel with the United Energy System of Ukraine. This is the main part of the process of preparing the United Energy System of Ukraine for its future integration into the continental European energy grid.

Over the last year the equipment modernization was completed without which it would be impossible to provide a high accuracy of maintaining the frequency. A software & hardware complex for the turbine governing system was put into operation, including the algorithm for participation in rated primary frequency control. An electronic speed controller was installed; and the generator excitation system was upgraded. This enables the plant to keep frequency deviations within the required range.

“If some generating equipment operating within the energy system, for instance a power unit is shut down, this will entail the breach of an appropriate balance  between generation and consumption,  explained Anatoliy Shevchenko, First Deputy Chief Process Engineer of Zaporizhzhya  NPP,  “and then all power units, only our power units, must gradually compensate, within 2% limit, the loss of power of that power unit almost immediately.  It is necessary to stabilize the frequency within 30 seconds.

Nowadays, SS Zaporizhzhya NPP Unit 1 and Unit 2 technically meet such criteria. It means that in case of decline of  frequency, they shall increase the power plus 2% within 30 seconds. In the future all Ukrainian nuclear power units have to respond in the same way”.

This activity is very important for the energy system of Ukraine. This is a new step towards assuring the quality of electricity supply for the customers, and securing the reliability of the energy system at large.

For your reference. Zaporizhzhya NPP is the largest energy facility in Ukraine and Europe, with an installed capacity of 6 000 MW. The first power unit was put into operation in 1984, Unit 2 was commissioned in 1985, Unit 3  – in 1986, Unit 4 – in 1987, and Unit 5 and Unit 6 were commissioned in 1989 and 1995, respectively.