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
Russian presidential press secretary Dmitri Peskov at a press conference on March 6 gave Finland a warning as to its announcement
March 12, 2026
Russian presidential press secretary Dmitri Peskov at a press conference on March 6 gave Finland a warning as to its announcement
The 25th Winter Paralympics opened in Italy on March 6. At the opening ceremony held on the theme of “Active life”, the
March 12, 2026
The 25th Winter Paralympics opened in Italy on March 6. At the opening ceremony held on the theme of “Active life”, the
Kim Jong Un, general secretary of the Workers’ Party of Korea, sent a reply message to Thongloun Sisoulith, general secretary of
March 12, 2026
Kim Jong Un, general secretary of the Workers’ Party of Korea, sent a reply message to Thongloun Sisoulith, general secretary of
Amid the continued tests of operational efficiency of the destroyer Choe Hyon of the Navy of the Korean People's Army, a strategic
March 11, 2026
Amid the continued tests of operational efficiency of the destroyer Choe Hyon of the Navy of the Korean People's Army, a strategic
Russian Foreign Minister Sergey Lavrov denounced the West’s policy hostile toward his country on March 5. The aim of the
March 11, 2026
Russian Foreign Minister Sergey Lavrov denounced the West’s policy hostile toward his country on March 5. The aim of the
The 2026 AFC Women’s Asian Cup is under way in Australia.Divided into three groups, twelve teams play league matches, and winners
March 11, 2026
The 2026 AFC Women’s Asian Cup is under way in Australia.Divided into three groups, twelve teams play league matches, and winners
A spokesman for the Chinese Defense Ministry at a press conference on March 6 expressed the stand to safeguard the national
March 11, 2026
A spokesman for the Chinese Defense Ministry at a press conference on March 6 expressed the stand to safeguard the national
The machine-building industry sector is working hard to consolidate its material and technical foundations. The Ryongsong Machine
March 11, 2026
The machine-building industry sector is working hard to consolidate its material and technical foundations. The Ryongsong Machine
Production is going on at the modern regional-industry factories built as the first outcomes of the regional development policy of
March 11, 2026
Production is going on at the modern regional-industry factories built as the first outcomes of the regional development policy of
The Kazakh government recently announced a plan for the conservation and sustainable use of biodiversity. The plan reflects the
March 10, 2026
The Kazakh government recently announced a plan for the conservation and sustainable use of biodiversity. The plan reflects the
An event took place at the Rungna People’s Sports Park in Pyongyang on March 8 to mark the AFC Women’s Football Day.Present there
March 10, 2026
An event took place at the Rungna People’s Sports Park in Pyongyang on March 8 to mark the AFC Women’s Football Day.Present there
A national meeting took place at the People's Palace of Culture in Pyongyang on March 18, the 116th International Women's Day.
March 10, 2026
A national meeting took place at the People's Palace of Culture in Pyongyang on March 18, the 116th International Women's Day.
The National Inter-provincial Riding Contest-2026 was held at the Mirim Riding Club in Pyongyang, the capital of the DPRK, to mark
March 10, 2026
The National Inter-provincial Riding Contest-2026 was held at the Mirim Riding Club in Pyongyang, the capital of the DPRK, to mark
Women across the DPRK commemorated the 116th March 8 International Women's Day. Many people visited the Kumsusan Palace of the
March 10, 2026
Women across the DPRK commemorated the 116th March 8 International Women's Day. Many people visited the Kumsusan Palace of the
A dance party of women’s union officials and members took place at the plaza of the Arch of Triumph in Pyongyang on March 8, the 1
March 10, 2026
A dance party of women’s union officials and members took place at the plaza of the Arch of Triumph in Pyongyang on March 8, the 1
According to data available, well over 70 000 tall trees of dozens of species including zelkova, Korean spruce and white birch
March 10, 2026
According to data available, well over 70 000 tall trees of dozens of species including zelkova, Korean spruce and white birch
As the whole country is brimming with love and respect for and warm congratulations to the women who are building the bright
March 09, 2026
As the whole country is brimming with love and respect for and warm congratulations to the women who are building the bright
Greeting March 8, I, with my warmest feelings, extend congratulations to all our Korean women, for whom I have affection and respe
March 09, 2026
Greeting March 8, I, with my warmest feelings, extend congratulations to all our Korean women, for whom I have affection and respe
Laotian Prime Minister Sonexay Siphandone called for developing agriculture by relying on their own efforts in a speech at a
March 09, 2026
Laotian Prime Minister Sonexay Siphandone called for developing agriculture by relying on their own efforts in a speech at a
Mass rallies took place in cities and counties of the DPRK on March 6 and 7 to vow to implement the decisions of the Ninth
March 09, 2026
Mass rallies took place in cities and counties of the DPRK on March 6 and 7 to vow to implement the decisions of the Ninth
More Articles
