Method for the computer-aided control of the power in an electrical grid

Patent metadata

Field	Value
Publication number	US-10944265-B2
Application number	US-201615766246-A
Country	US
Kind code	B2
Filing date	Aug 31, 2016
Priority date	Oct 13, 2015
Publication date	Mar 9, 2021
Grant date	Mar 9, 2021

Abstract

A method for computer-supported control of the power in an electrical power supply network, including a plurality of nodes which are connected to one another via power lines, each containing a first energy generator and/or a second energy generator and/or an energy consumer is provided. A power estimation is provided for each node, which is composed of an estimation of the future load of the energy consumer and an estimation of the future power of the second regenerative energy generator in the respective node. Fluctuations of a first type of the power estimations for the respective nodes are permitted in a first predetermined tolerance region, and fluctuations of a second type of the power estimations are permitted in a second predetermined tolerance region. The fluctuations of the first type are compensated by primary balancing power and the fluctuations of the second type are compensated by secondary balancing power.

First claim

The invention claimed is:

1. A method for computer-aided control of power in an electrical grid, the electrical grid having a predefined nominal frequency and comprising a plurality of nodes which are connected to one another via power lines, the plurality of nodes comprising a first energy producer from one or more non-regenerative energy production installations, a second energy producer from one or more regenerative energy production installations, and an energy consumer from one or more energy consumption units, the electrical grid containing both one or more first and second energy producers and one or more energy consumers, a power estimate being predefined for a respective node, which power estimate is composed of an estimate of a future load of the energy consumer and an estimate of a regenerative power produced in the future by the second energy producer in the respective node, wherein the power estimate does not include planned power of the first energy producer, and fluctuations of a first type in the power estimates being allowed for respective nodes in a first predefined tolerance range and fluctuations of a second type in the power estimates being allowed for the respective nodes in a second predefined tolerance range, in which case the fluctuations of the first type are compensated for by primary control power in the electrical grid and the fluctuations of the second type are compensated for by secondary control power in the electrical grid, the method comprising:
a) modeling a steady state of the electrical grid, in which a steady-state grid frequency is established for all voltages of the nodes; and
b) solving an optimization problem including determining and setting planned power produced by the first energy producer and allocating primary control powers and secondary control powers to the respective nodes by means of the modeled steady state on a basis of the power estimates and the first tolerance range and the second tolerance range in such a manner that a deviation of the steady-state grid frequency from the predefined nominal frequency and a power on the power lines are minimized.

2. The method as claimed in claim 1 , wherein the optimization problem is defined as an optimization of a cost function which contains a sum of a plurality of cost terms, the cost terms containing at least one of: a first cost term for the primary control powers allocated to the respective nodes or deviations of these primary control powers from predefined desired values and a second cost term for the secondary control powers allocated to the respective nodes or deviations of these secondary control powers from predefined desired values.

3. The method as claimed in claim 1 , wherein the cost function also comprises a third cost term for the planned powers produced by the first energy producers of the nodes or for deviations of these powers from desired values.

4. The method as claimed in claim 1 , wherein the steady-state of the electrical grid is modeled on the basis of load flow equations for the powers occurring in the respective nodes.

5. The method as claimed claim 1 , wherein at least one of: the first tolerance range and the second tolerance range is defined in such a manner that the fluctuation of at least one of the first type and the second type in the power estimate is in a predetermined tolerance interval for each node.

6. The method as claimed in claim 1 , wherein at least one of the first tolerance range and the second tolerance range is defined in such a manner that a weighted sum of the fluctuations of at least one of the first type and the second type in the power estimates is less than or equal to a predetermined value for all nodes.

7. The method as claimed in claim 1 , wherein, when solving the optimization problem, the secondary condition, whereby the planned powers produced by at least one of the first energy producers, the primary control powers, and the secondary control powers allocated to the respective nodes are minimized, is taken into account.

8. The method as claimed in claim 1 , wherein the optimization problem is converted into a convex optimization problem as part of its solution.

9. An apparatus for computer-aided control of the power in an electrical grid, the electrical grid having a predefined nominal frequency and comprising a plurality of nodes which are connected to one another via power lines and the plurality of nodes comprising a first energy producer from one or more non-regenerative energy production installations, a second energy producer from one or more regenerative energy production installations, and an energy consumer from one or more energy consumption units, the electrical grid containing both one or more first and second energy producers and one or more energy consumers, a power estimate being predefined for a respective node, which power estimate is composed of an estimate of the future load of the energy consumer and an estimate of the future power of the second regenerative energy producer in the respective node, wherein the power estimate does not include planned power of the first energy producer, and fluctuations of a first type in the power estimates being allowed for respective nodes in a first predefined tolerance range and fluctuations of a second type in the power estimates being allowed for the respective nodes in a second predefined tolerance range, in which case the fluctuations of the first type are compensated for by primary control power in the electrical grid and the fluctuations of the second type are compensated for by secondary control power in the electrical grid, wherein the apparatus is set up to carry out a method in which:
a) modeling a steady state of the grid, in which a steady-state grid frequency is established for all voltages of the nodes; and
b) solving an optimization problem including determining and setting planned power produced by the first energy producer and allocating primary control powers and secondary control powers to the respective nodes by means of the modeled steady state on the basis of the power estimates and the first and second tolerance ranges in such a manner that the deviation of the steady-state grid frequency from the nominal frequency and the power on the power lines are minimized.

10. An electrical grid which has a predefined nominal frequency and comprises a plurality of nodes which are connected to one another via power lines and the plurality of nodes comprising a first energy producer from one or more non-regenerative energy production installations, a second energy producer from one or more regenerative energy production installations, and an energy consumer from one or more energy consumption units, the electrical grid containing both one or more first and second energy producers and one or more energy consumers, a power estimate being predefined for a respective node, which power estimate is composed of an estimate of the future load of the energy consumer and an estimate of the future power of the second regenerative energy producer in the respective node, wherein the power estimate does not include planned power of the first energy producer, and fluctuations of a first type in the power estimates being allowed for respective nodes in a first predefined tolerance range and fluctuations of a second type in the power estimates being allowed for the respective nodes in a second predefined tolerance range, in which case the fluctuations of the first type are compensated for by primary control power in the electrical grid and the fluctuations of the second type are compensated for by secondary control power in the electrical grid, wherein:
the electrical grid comprises an apparatus for computer-aided control of the power that i

Assignees

• Siemens Ag

Inventors

• Metzger Michael
• Münz Ulrich
• Wolfrum Philipp

Classifications

• H02J2103/30

  Simulating, planning, modelling, reliability check or computer assisted design [CAD] of electric power networks · CPC title

• H02J2105/12

  supplying households or buildings · CPC title

• H02J3/14 Primary

  by switching loads on to, or off from, the networks, e.g. progressively balanced loading · CPC title

• H02J3/38 Primary

  Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel · CPC title

• Y04S20/222

  Demand response systems, e.g. load shedding, peak shaving · CPC title