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Energy management problem Part 13

Tham khảo tài liệu 'energy management problem part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Energy Management 233 Fig. 32. Supervisory control and energy management scenario. As stated previously the responsibility of the grid supporting mode is to maintain the system power balance. The reference power of the grid supporting inverter is calculated in the supervisory unit based on other inverters in the system grid forming and parallel modes and loads. Moreover it depends also on the pre-setting percentages or algorithms used in the supervisory control to manage the power balance. The reference values of Pgs and Qgs are calculated based on that. In the simplest case the set values can be adjusted by the percentage value GSpercent and the active power load Pload and reactive power load Qioad . As a simple example the set values of active and reactive power can be calculated via equations 17 and 18 respectively 234 Energy Management _ si1 P d P GS _ ref - -------- m PgPj X GSpercent 100 17 QgS _ ref E 1Qioad E mj 1 Qgp. x GSpereent 100 18 Where 1Pload and 1 Qload. are the summation of the active and reactive power of load in the system where n is the number of loads and i is the counter. . 1PGP. and . 1 Qgp. are the summation of the active and reactive power of grid parallel units in the system where m is the number of grid parallel units and j is the counter. This means that the amount of power needed is deducted from the power of the grid parallel units since they cannot be influenced by the grid the rest is shared between the grid forming and supporting according to the percentage GSpercent. This percentage can be calculated according to an algorithm based on the units ratings meteorological parameters economical dispatch prospective and user settings but this will not be taken into discussion over here since its out of the scope of this study. This was demonstrated in Osama Omari Egon Ortjohann et al. 2007 . After the actual active and reactive power of the grid supporting mode is passed to the outer loop of the controllers another inner current control