The electricity research institute of the State Academy of Sciences developed an excitation control device for synchronous generator.
The device maintains the terminal voltage of generator at a certain rate, evenly distributes reactive power to generators in parallel operation and keeps up the synchronous operation state of generators in times of trouble with the electrical system.
“Our research team analysed the defects of the previous excitation control device, developed a new one and introduced it to several power stations,” said Jo Chol Jin, section chief of the institute.
According to him, the previous device was greatly affected by frequency variation and failed to sensitively respond to the change in the operation state of various electrical systems. Another defect was that at thermal power plants using high frequency subexciters, the reactive power fluctuated as synchronizing signal measurement error of the subexciters became greater along with the increase in excitation current and subsequently the operation of controlled rectifiers got unsteady.
The research team developed a digitalized and intelligent excitation control device and program for thermal and hydroelectric power stations.
The device helps enhance the stability of operation and manoeuvrability of generator in various ranges of variation in voltage and frequency.
And the team has duplexed the excitation control system and improved the reliability of operation of generator and the stability of electrical system with various troubleshooting and excitation limiting functions.
“In particular, we studied and introduced a methodology for overcoming the effect of the phase short circuit caused by the rise in the inductance of line and load current, which was one of knotty problems in checking and measuring the synchronizing signal of thermal generators using high-frequency subexciters, and for compensating phase lag of control angle and ascertained the effectiveness of the methodology,” said researcher Ri Kwang Jin.
The new excitation control device costs 25 percent less than the previous one and can more than double the control precision and reduce the overshoot to less than ten percent.
“Our complex introduced the new excitation control device for synchronous generator this year and thus increased the lifespan of generating facilities and saved much labour and fund for repairing equipment,” said Ri Myong Sop, senior engineer of the Pukchang Thermal Power Complex.
More From Pyongyang Times
Dmitri Medvedev, vice-chairman of the Security Council of Russia, posted an article on an SNS on January 12 to deride the US’ atte
January 21, 2026
Dmitri Medvedev, vice-chairman of the Security Council of Russia, posted an article on an SNS on January 12 to deride the US’ atte
Russia decided to deport a diplomat of the British embassy in the country. On January 15, the Russian Foreign Ministry called the
January 21, 2026
Russia decided to deport a diplomat of the British embassy in the country. On January 15, the Russian Foreign Ministry called the
Spectacular scenes of rural development have unfolded at several farms in Kangwon Province. Newly-built public and production
January 21, 2026
Spectacular scenes of rural development have unfolded at several farms in Kangwon Province. Newly-built public and production
The Academy of Forest Science has been built on a modern basis. The academy has all facilities and conditions, including an office
January 21, 2026
The Academy of Forest Science has been built on a modern basis. The academy has all facilities and conditions, including an office
Over the past five years since the Eighth Congress of the Workers’ Party of Korea, a new era of overall development has been
January 21, 2026
Over the past five years since the Eighth Congress of the Workers’ Party of Korea, a new era of overall development has been
A croaker pedigree farm has been built at the Ongjin West Sea Fish Farm. The pedigree farm has an office building, welfare
January 21, 2026
A croaker pedigree farm has been built at the Ongjin West Sea Fish Farm. The pedigree farm has an office building, welfare
The Central Committee of the Workers' Party of Korea sent a congratulatory message to the 14th Congress of the Communist Party of
January 21, 2026
The Central Committee of the Workers' Party of Korea sent a congratulatory message to the 14th Congress of the Communist Party of
The Ryongsong Machine Complex, where a flaming torch was lit to create the Chollima spirit in the new era, has turned into a
January 20, 2026
The Ryongsong Machine Complex, where a flaming torch was lit to create the Chollima spirit in the new era, has turned into a
Comrades,I express gratitude to the workers of Ryongsong, teachers and researchers from Kim Chaek University of Technology and Pyo
January 20, 2026
Comrades,I express gratitude to the workers of Ryongsong, teachers and researchers from Kim Chaek University of Technology and Pyo
The Mexican President said in a press conference on January 13 that her country would maintain a foreign policy based on equality
January 20, 2026
The Mexican President said in a press conference on January 13 that her country would maintain a foreign policy based on equality
The ideal socialist villages indicative of the Korean-style civilization of the countryside sprang up at the Chollisong Farm in
January 20, 2026
The ideal socialist villages indicative of the Korean-style civilization of the countryside sprang up at the Chollisong Farm in
The participants in the celebrations of the 80th founding anniversary of the Socialist Patriotic Youth League toured Pyongyang.
January 20, 2026
The participants in the celebrations of the 80th founding anniversary of the Socialist Patriotic Youth League toured Pyongyang.
At the end of last year, the Korean people greeted the second inauguration season in implementing the Regional Development 20×10
January 20, 2026
At the end of last year, the Korean people greeted the second inauguration season in implementing the Regional Development 20×10
The authorities of Greenland issued a statement on January 12 to reject the US' attempt to annex Greenland.As regards the fact tha
January 19, 2026
The authorities of Greenland issued a statement on January 12 to reject the US' attempt to annex Greenland.As regards the fact tha
Today, when the moves of the forces trying to realize their ambition for world domination are getting ever more undisguised,
January 19, 2026
Today, when the moves of the forces trying to realize their ambition for world domination are getting ever more undisguised,
The respected Comrade Kim Jong Un sent birthday spreads to Kim Sun Han, a woman centenarian living in Neighbourhood Unit No. 49,
January 19, 2026
The respected Comrade Kim Jong Un sent birthday spreads to Kim Sun Han, a woman centenarian living in Neighbourhood Unit No. 49,
Modern houses, symbolic of the era of the Workers' Party, have been built at the Usan Cotton Farm in Hanggu District and the
January 19, 2026
Modern houses, symbolic of the era of the Workers' Party, have been built at the Usan Cotton Farm in Hanggu District and the
The Jikha Atlantic Salmon Pedigree Farm was inaugurated in North Hamgyong Province. The construction of the pedigree farm with all
January 19, 2026
The Jikha Atlantic Salmon Pedigree Farm was inaugurated in North Hamgyong Province. The construction of the pedigree farm with all
On New Year’s Day ten years ago, the inauguration ceremony of the Sci-Tech Complex was held in splendour in the presence of the
January 19, 2026
On New Year’s Day ten years ago, the inauguration ceremony of the Sci-Tech Complex was held in splendour in the presence of the
Kim Jong Un, general secretary of the Workers' Party of Korea and president of the State Affairs of the Democratic People's
January 19, 2026
Kim Jong Un, general secretary of the Workers' Party of Korea and president of the State Affairs of the Democratic People's
More Articles