Компенсатор реактивної потужності у перехідних режимах
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Дата
2018
ORCID
DOI
10.20998/2413-4295.2018.26.42
Науковий ступінь
Рівень дисертації
Шифр та назва спеціальності
Рада захисту
Установа захисту
Науковий керівник
Члени комітету
Видавець
НТУ "ХПІ"
Анотація
У статті аналізуються причини низької ефективності компенсаторів реактивної потужності у перехідних процесах. Розраховуються орієнтовні значення коефіцієнту потужності при заданому графіку споживання енергії ємнісним, індуктивним та змішаним навантаженням при використанні звичайного компенсатора. Запропоновано використання додаткового компенсатора, що усуває високочастотні спотворення струму мережі після основного компенсатора. Оцінено підвищення коефіцієнту потужності при використані заданого підходу. Проаналізовано збільшення встановленої потужності додаткового компенсатора від похибки прогнозування першої гармоніки струму.
Compensation of reactive power is one of the ways of increasing the electrical grid efficiency, theoretical foundations of which were developed at the beginning of the last century. The development of effective control algorithms for reactive power compensation continues today. As usual, algorithms of reactive power compensation have inertia of at least one period of network voltage. Therefore, they cannot be used in transient mode because of the grid current non-stationarity. The problem of reactive power compensation in power grids with variable load is analyzed. The transient modes behavior depends of the load types are analyzed. An inefficient implementation of existing methods of reactive power compensation for this case is shown. The method of analysis of the transmitting energy between the source and the load during the transition process based on the theory of instantaneous power is proposed. The low efficiency of classical reactive power compensators is shown. In parallel with the main reactive power compensator, it is proposed to use an auxiliary one, which eliminates distortion of the grid current based on its predicting. It is shown that the use of the additional compensator allows reaching power factor value closed to one with a non-significant increase in the total installed capacity of the compensation system. The additional compensator is compensated only high-frequency current distortion, whereas low-frequency subharmonics created by features of load power consumption are presence in the grid current. Therefore a total power factor of the grid current is less than one. An increase in the installed capacity of the additional compensator from the prediction error of the first harmonic of current is analyzed.
Compensation of reactive power is one of the ways of increasing the electrical grid efficiency, theoretical foundations of which were developed at the beginning of the last century. The development of effective control algorithms for reactive power compensation continues today. As usual, algorithms of reactive power compensation have inertia of at least one period of network voltage. Therefore, they cannot be used in transient mode because of the grid current non-stationarity. The problem of reactive power compensation in power grids with variable load is analyzed. The transient modes behavior depends of the load types are analyzed. An inefficient implementation of existing methods of reactive power compensation for this case is shown. The method of analysis of the transmitting energy between the source and the load during the transition process based on the theory of instantaneous power is proposed. The low efficiency of classical reactive power compensators is shown. In parallel with the main reactive power compensator, it is proposed to use an auxiliary one, which eliminates distortion of the grid current based on its predicting. It is shown that the use of the additional compensator allows reaching power factor value closed to one with a non-significant increase in the total installed capacity of the compensation system. The additional compensator is compensated only high-frequency current distortion, whereas low-frequency subharmonics created by features of load power consumption are presence in the grid current. Therefore a total power factor of the grid current is less than one. An increase in the installed capacity of the additional compensator from the prediction error of the first harmonic of current is analyzed.
Опис
Ключові слова
коефіцієнт потужності, перехідні процеси, навантаження, компенсатор, power factor
Бібліографічний опис
Компенсатор реактивної потужності у перехідних режимах / Є. В. Вербицький [та ін.] // Вісник Національного технічного університету "ХПІ". Сер. : Нові рішення в сучасних технологіях = Bulletin of the National Technical University "KhPI". Ser. : New solutions in modern technology : зб. наук. пр. – Харків : НТУ "ХПІ", 2018. – № 26 (1302), т. 2. – С. 121-125.