| 摘要 |
The present invention is a method for the control of power ramp-rates minimizing energy storage requirements in intermittent power generation plants, such as for example a photovoltaic solar plant, which minimizes the energy storage requirements approximately halving the size of storage systems necessary to comply with a maximum allowable ramp-rate given by a grid code regulation regarding the state of the art, reducing thus investment costs in the plant and/or carrying out a rationalized use of the energy storage system, in such a way that in order to achieve the same maximum fluctuation ramp, a minor use is done of the energy storage system, minimizing the losses and extending its working life, and therefore reducing the plant operational costs. |
| 主权项 |
1. Method for the control of power ramp-rates minimizing energy storage requirements in intermittent power generation plants for complying with a maximum allowable ramp-rate value to the power being fed in the grid, PG(t), given by a grid code regulation, by the intermittent power generation plant characterized in that the method comprises:
a stage for calculating the maximum plant power, PMax(t), and the minimum plant power, PMin(t) of the instantaneous power generated by the intermittent power generation plant, P(t), being the maximum plant power, PMax(t), and the minimum plant power, PMin(t), the maximum and minimum power respectively that can occur at the photovoltaic plant at time t; a stage for determining the worst possible fluctuation that can occur in the instantaneous power generated by the intermittent power generation plant, P(t), wherein the worst possible fluctuation is one of the two following fluctuations: a positive fluctuation being calculated between the instantaneous power P(t) and the maximum plant power, PMax(t) and a negative fluctuation being calculated between the instantaneous power P(t) and the minimum plant power, PMin(t); a stage for calculating dynamically the target state of charge, SOCtar(t), of a energy storage system required to support the worst possible fluctuation; and a control stage wherein the state of charge SOC(t) of the energy storage system associated to the difference between the power being fed in the grid, PG(t), and the instantaneous power generated by the intermittent power generation plant, P(t), is modified accordingly to the target state of charge, SOCtar(t) if the previous value of the target state of charge, SOCtar(t−1), is not able to support the worst possible fluctuation or is not modified if the previous value of the target state of charge, SOCtar(t−1), is able to support the worst possible fluctuation. |
