යන්කුරු පිටුපස් පරිවර්තකයන් සහිත වායු ටැබ් උපකාරක ප්රකාර සුලු කරන ලද ආකෘතිය
Vātu bala saṃvidhāna, anavasāriya athva suddha urjā vikāsaya ekak, adyāpi visesita paripūrṇa kriyā viduwa eka thibath yuthuva prabhāva karaganna siṭiyenawa. 2010 dekhiyata adhipati me 1.8×10⁴ MW kurulu upalabdha hondama ākṣepanā. Vātu bala saṃvidhānayē apakṣaya kālema samādhi, dīgha kālema laba, athva sāmānya upalabdhimata anuvartana rūpāya lakṣaṇa wahanava. Pāmukta mātara 50 - MW vātu bala saṃvidhāna eka kālema samādhi karana viya pahotuva. Samādhi karana pōsala, operēshenu kramaya gēniya, athva operēshenu athva rakkhawāna kāraya anuvartana rūpāya lāghava.
Vātu Bāḷa Saṃvidhānaya Labāgatāya Dīpana Kriyā Karana Yantragānu Lekha
Pasa vātu bala saṃvidhāna eka saha dīpana kriyā karana yantra eka saha saṃvidhāna karagatta. Mē nisphota kriyā (0.69 kV) dīpana kara, vātu bala saṃvidhāna eke saṃvidhāna karana lināvala samaḍḍiya karana viya. "eka yantra-eka dīpana kriyā karana yantra" sambandhaya saha saṃvidhāna karagatta. Saṃvidhāna lināvala vātu bala saṃvidhāna eke saha dīpana suba stanaya saha jālāya samaḍḍiya karana viya. Adyāpi dīpana kriyā karana yantragānu saha pasan dīpana kriyā karana yantragānu tīna prakāra saha saṃvidhāna karagatta: sadā santhāna āvashya oil immersed transformers (kalāla prabāva), European-style prefabricated substations, American-style prefabricated substations (American-style box-type substations). Tisu madhye, American-style box-type substations adyāpi balābhāraka prabāva.
European-style prefabricated substations tulanāya, American-style box-type substations kompakta struktura, pūrṇa seal, alpa vāmā, elbow-type cable plugs prayogayata, gas protection nāma, operēshenu athva rakkhawāna kāraya lāghava. American-style box-type substations nagarika distribūshenu jālāya prayogayata, ramya vasanthā, udhyōga kendra, vyāpāra kendra, athva anya urjā pradāna sthāna. Adyāpi, vātu bala saṃvidhānaya dīpana kriyā karana yantragānu saha prayogayata. Tisu typical electrical wiring scheme (distribution network apply karana viya basic same) Figure 1 e. Distribution network requirements anuvartana rūpāya, American-style box-type substations saha corresponding protections:
Oil-immersed plug-in fuses, low-voltage side of the transformer short-circuit fault occur karana viya;
Oil-immersed current-limiting fuses, high-voltage side inside the transformer short-circuit fault occur karana viya, accident expand karana viya prevent karana viya;
A three-phase interlocked load switch, immersed in oil, transformer with load closing operation complete karana viya;
An intelligent circuit breaker (or fuse disconnect switch), mainly used to protect the load side.
American-style Box-type Substations Protection Configuration Simplification
Simplification Principles
American-style transformer refers to a transformer that retains the basic features of an American-style box-type substation, such as its structure, corrugated radiators, absence of gas protection, pressure-relief valves, and current-limiting fuses. However, it simplifies the protection devices. Based on the summary of wind power operation experience, some components of its grid protection are removed, making it a transformer specifically used for wind power.
Simplified Protection Configuration
It is technically feasible to remove the grid protection components from American-style box-type substations applied in wind power. The collector lines are equipped with reliable protection devices (installed in the step-up substation). The collector lines need to be connected to the step-up substation, and after stepping up the voltage, they are connected to the system. The step-up station sets up line protection for each collector line respectively. The protection range not only covers the collector lines but also extends to the box-type substation and the wind turbines. Once a short-circuit or other faults occur on a certain line, the line protection will act and disconnect that line. The wind turbines are equipped with a complete set of grid protection devices (installed in the ground control cabinet). Once a grid fault or abnormality occurs, the wind turbine protection will act and cut off the wind turbine (here, the grid refers to the collector line and box-type substation system). Table 1 shows the grid protection set by the wind turbine manufacturer.
Some of the protection configurations of box-type substations are relatively simple. Their protection functions are far inferior to those of the collector line protection and wind turbine protection, and they form redundant cross-protection. Therefore, the grid protection configured in box-type substations is unnecessary and can be removed. The protection scope and functions of intelligent circuit breakers can be completely replaced by the grid protection of wind turbines. Meanwhile, eliminating some unnecessary components, such as load switches and plug-in fuses, helps reduce potential accident points and improve the operational reliability of the equipment.
Protection Settings of Simplified American-style Box-type Substations
To ensure that the simplified American-style box-type substations can meet the operational requirements of wind farms, the Electric Power Research Institute of Jilin Electric Power Co., Ltd. organized 18 experts from Jilin Electric Power Co., Ltd., Beijing Sifang Micro-Electronic Co., Ltd., Datang Jilin Company, and other units to carefully demonstrate and review the configuration of simplified American-style box-type substations. It was recognized that the simplified American-style box-type substation is a dedicated transformer for wind power, developed based on the digestion of American-style box-type substation technology. Technologically, it fully meets the requirements for the safe and reliable operation of wind turbine units, has good economic benefits, and can be widely promoted and used in wind farms. The configuration of the simplified American-style box-type substation is shown in Figure 2.
Technical and Economic Analysis
Most wind farms currently adopt the originally-designed American-style box-type substations, whose complex protection functions are not suitable for wind power systems. Using simplified American-style box-type substations can significantly reduce equipment costs, bringing good social and economic benefits. Preliminary calculations show that the cost of each unit can be reduced by approximately 30,000 yuan.
After eliminating some unnecessary components such as load switches, plug-in fuses, and intelligent circuit breakers, the number of potential accident points is reduced, greatly decreasing the probability of accidents. The operation is simple, convenient, safe, and reliable, with a substantial reduction in maintenance workload. Simplified American-style box-type substations have been applied in some wind farms in Jilin Province, achieving obvious social and economic benefits.
