METHOD FOR CONTROLLING THE ELECTRICAL POWER DELIVERED OVER AN ELECTRICAL SUPPLY NETWORK BY AT LEAST TWO ELECTRICAL ENERGY SOURCES AND ASSOCIATED ELECTRICAL SYSTEM

• US 20160006244A1
• Filed: 07/02/2015
• Published: 01/07/2016
• Est. Priority Date: 07/04/2014
• Status: Active Grant

• Current Assignee: Schneider Electric Industries SAS (Schneider Electric SE)
• Original Assignee: Schneider Electric Industries SAS (Schneider Electric SE)
• Inventors: AULAGNIER, Vincent
• Granted Patent: US 9,948,097 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06Q 50/06 Energy or water supply
• CPC Class Codes: H02J 3/00 Circuit arrangements for ac mains or ac distribution networks
• CPC Class Codes: H02J 3/04 for connecting networks of the same frequency but supplied from different sources
• CPC Class Codes: H02J 3/12 for adjusting voltage in ac networks by changing a characteristic of the network load
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers

Abstract

In this control method for controlling the electrical power delivered over an electrical supply network (20) by at least two sources (16) of electrical energy, each energy source (16) comprises a storage member (22) for storing electrical energy. The method includes for each energy source (16) the following steps:

• • the application by the electrical energy source (16) of an alternating current voltage signal over the electrical supply network (20);
  • the measurement of an associated electrical power;
  • the determination of an electrical energy stored in the storage member (22);
  • the calculation of a set point value for the voltage signal parameter as a function of the measured power;
  • the modification of the voltage signal, the value of the voltage signal parameter being modified so as to be equal to the calculated set point value.

During the calculation step, the set point value is calculated additionally as a function of the stored electrical energy determined.

Claims

1. A control method for controlling the electrical power delivered over an electrical supply network by at least two sources of electrical energy, each electrical energy source being connected to the network and comprising a storage member for storing electrical energy, the method including for each energy source the following steps:

the application by the electrical energy source of an alternating current voltage signal over the electrical supply network for the supplying of electrical power to the network, with a parameter of the voltage signal having a predetermined initial value;

the measurement of an electrical power associated with the voltage signal applied;

the determination of an electrical energy stored in the storage member;

the calculation of a set point value for the voltage signal parameter as a function of the measured power;

the modification of the voltage signal, the value of the voltage signal parameter being modified so as to be equal to the calculated set point value;

characterised in that during the calculation step, the set point value is calculated as a function of the stored electrical energy determined.

2. A method according to claim 1, wherein the parameter of the voltage signal is selected from an amplitude of the voltage signal and a frequency of the voltage signal, depending on the type of network.

3. A method according to claim 1, wherein during the calculation step, the set point value is a decreasing function of the electrical power and an increasing function of the stored electrical energy.

4. A method according to claim 3, wherein, previously during the calculation step, the method includes, for each energy source, a step of:

recording of a value for maximal electrical energy that is able to be stored by the storage member;

and wherein, during the calculation step, the set point value is a function of a first ratio between the stored electrical energy and the maximum electrical energy.

5. A method according to claim 4, wherein during the calculation step, the set point value is determined based on a first affine function, the first affine function being dependent on the measured electrical power and having a negative slope.

6. A method according to claim 5, wherein the first affine equation satisfies the following equation:

7. A method according to claim 6, wherein each energy source is capable of delivering a maximal power to the network, wherein a product between, on the one hand, the difference between the first coefficient and the second coefficient and, on the other hand, the maximal power is identical for each of the energy sources.

8. A method according to claim 3, wherein each energy source is capable of delivering a maximal power to the network and in order for the parameter of the voltage signal to be greater than a minimal operating value;

and

wherein for each electrical energy source during the calculation step, the set point value is equal to the minimal operating value when the measured electrical power is equal to the maximal power.

9. A method according to claim 8, wherein during the calculation step, the set point value is calculated based on a continuous piecewise linear function which is equal to a first affine function, being dependent on the measured electrical power and having a negative slope, for a first power interval and to a second affine function for a second power interval, the second interval comprising the maximal power, and the lower bound of the second interval being greater than or equal to the upper bound of the first interval.

10. A method according to claim 3, wherein each energy source is capable of delivering a maximal power Pn_j to the network and in order for the parameter of the voltage signal to be greater than a minimal operating value B_min, and

wherein, during the calculation step, the voltage signal parameter is calculated on the basis of the following equation:

11. An electrical system comprising at least two sources of electrical energy, each electrical energy source being connected to the electrical supply network and comprising a storage member for storing electrical energy, and a control module for controlling the storage member, each control module comprising:

a signal application unit for applying an alternating voltage signal over the electrical supply network for the supply of electrical power to the network, with a parameter of the voltage signal having a predetermined initial value;

measurement means for measuring an electrical power associated with the signal voltage applied;

determination means for determining an electrical energy stored in the storage member;

calculation means for calculating a set point value of the voltage signal parameter as a function of the measured power; and

signal modification means for modifying the voltage signal that is capable of modifying the value of the voltage signal parameter in order for the value of the voltage signal parameter to be equal to the calculated set point value;

characterised in that the calculation means are capable of calculating the set point value as a function moreover of the stored electrical energy determined.