Power management of a hybrid power plant
A method of power management of a hybrid power plant includes at least one type of renewable power generation equipment and an energy storage system, including: before a first dispatching time range: using first forecasts of energy production capability and energy price, and in particular hybrid plant status and plant parameters, to derive a first power generation schedule defining power generation in the first dispatching time range; at a dispatch point in time within the first dispatching time range: using second forecasts of energy production capability and energy price, and in particular plant status and plant parameters, to derive a second power generation schedule defining power generation in a second dispatching time range; and calculating an optimal power injection value for the dispatch point in time based on the first power generation schedule and the second power generation schedule taking into account at least one constraint.
1. A method of power management of a hybrid power plant using a processor and having at least one type of renewable power generation equipment and an energy storage system for storing power for a utility grid, comprising:
before a first dispatching time range: to derive, using first forecasts of energy production capability and energy price, a first power generation schedule defining power generation in the first dispatching time range;
at a dispatch point in time within the first dispatching time range: using second forecasts of energy production capability and energy price, comprising plant status and/or plant parameters, to derive a second power generation schedule defining power generation in a second dispatching time range;
calculating an optimal power injection value for the dispatch point in time based on the first power generation schedule and the second power generation schedule taking into account at least one constraint, wherein the first power generation schedule and the second power generation schedule determines an amount of hybrid plant power output communicated to a point of common connection to which the at least one power generation equipment and the energy storage system is connected; and
injecting the hybrid plant power output produced by the at least one type of renewable power generation equipment and stored by the energy storage system into the utility grid at the point of common connection according to the optimal power injection value.
2. The method according to claim 1 , wherein the constraint comprises a power threshold, wherein the optimal power injection value is calculated such that a deviation between the optimal power injection value and a power value according to the first generation schedule is below the power threshold,
wherein the power threshold is a relative power threshold, defining a maximally allowable deviation.
3. The method according to claim 1 , wherein calculating the optimal power injection value comprises finding an extreme of an objective function subject to the constraint.
4. The method according to claim 3 , wherein the objective function and/or the at least one constraint is designed to achieve at least one of:
a deviation mitigation, thereby applying capacity firming;
a technical optimization, thereby applying capacity firming;
an economic optimization, thereby applying energy arbitrage and/or time shifting, wherein price differences at different time ranges and/or for different types of energy are exploited for profit maximization.
5. The method according to claim 3 ,
calculating the optimal power injection value is performed using a model including the objective function,
wherein the model is composed of continuous variables with a linear characteristic;
wherein the objective function of the model and a set of linear constraints define a convex solution space including the optimal power injection value,
wherein the optimal power injection value is an extreme of the convex solution space.
6. The method according to claim 1 , wherein the constraint comprises at least one of the following:
at least one hybrid plant requirement;
at least one hybrid plant maximum power injection capability;
a charging and/or discharging capability of the storage system;
an allowed charging and/or discharging level of the storage system.
7. The method according to claim 1 , wherein the first power generation schedule and the second power generation schedule overlap in time or do not overlap in time.
8. The method according to claim 1 , wherein the optimal power injection value is calculated further considering actual energy production capability and/or actual energy price and/or actual hybrid plant status.
9. The method according to claim 1 ,
wherein the first and/or second dispatching time range has a duration of between 1 hours and 48 hours; and/or
wherein the optimal power injection value for subsequent dispatch points in time is calculated every 5 min to 60 min repetitively.
10. The method according to claim 1 , wherein the forecasts of energy production capability and/or energy price are obtained from an external source and/or include forecasts regarding at least one of:
power due to wind;
power due to sun irradiance;
power due to tidal;
plant power;
energy price of wind energy;
energy price of solar energy;
energy price of tidal energy;
energy price of any type of energy;
any other energy generation or consumption.
11. The method according to claim 1 ,
wherein the first and/or the second power generation schedule is derived such as to maximize plant power output and/or to minimize usage of the energy stored in the storage system and/or to maximize profit of selling the generated energy; and/or
wherein the hybrid plant comprises at least one wind and/or at least one solar energy converting unit.
12. An arrangement for power management of a hybrid power plant comprising at least one type of renewable power generation equipment and an energy storage system, the arrangement comprising a processor adapted:
before a first dispatching time range: to derive, using first forecasts of energy production capability and energy price, a first power generation schedule defining power generation in the first dispatching time range;
at a dispatch point in time within the first dispatching time range: to derive, using second forecasts of energy production capability and energy price, comprising plant status and/or plant parameters, a second power generation schedule defining power generation in a second dispatching time range; and
to calculate an optimal power injection value for the dispatch point in time based on the first power generation schedule and the second power generation schedule taking into account at least one constraint,
wherein the arrangement is adapted to carry out or control the method according to claim 1 .
13. A hybrid power plant system, comprising:
at least one type of renewable power generation equipment;
an energy storage system; and
the arrangement according to claim 12 .
14. The method according to claim 1 , wherein the at least one hybrid power plant comprises a wind park.
15. The method of claim 11 , wherein the at least one solar energy converting unit comprises a solar park and/or tidal energy converting equipment.