METHOD AND DATA PROCESSING CONFIGURATON FOR CONTROLLING POWER FLOW IN AN ELECTRICAL SUPPLY NETWORK

Abstract

A method controls power flow in an electrical supply network. The method includes: providing at least one power flow control device, providing a model of the electrical supply network for estimating the distribution of the power flow in the electrical supply network in accordance with predefined network parameters, and simulating the power flow in the network using the model such that a potential congestion path in the electrical supply network is identified. As a result of the simulation, a positioning scheme for the at least one power flow control device is provided, such that congestion in the identified potential congestion path can be avoided. The at least one power flow device is configured in accordance with the positioning scheme. The power flow in the supply network is controlled by means of the at least one power flow control device.

Claims

1. A method for controlling power flow in an electrical supply network, which comprise the steps of: providing at least one power flow control device; providing a model of the electrical supply network for estimating a distribution power flow in the electrical supply network in accordance with predefined network parameters; simulating the power flow in the electrical supply network using the model such that at least one identified potential congestion path in the electrical supply network is identified, wherein, as a result of a simulation, a positioning scheme for the at least one power flow control device is provided, such that congestion in the at least one identified potential congestion path can be avoided; configuring the at least one power flow control device in accordance with the positioning scheme; and controlling the power flow in the electrical supply network by means of the at least one power flow control device.

2. The method according to claim 1, which further comprises carrying out the simulation taking into consideration a placement of the power flow control device within the electrical supply network in order to determine an optimal power flow distribution in the electrical supply network.

3. The method according to claim 1, wherein the at least power flow control device is an universal power flow controller (UPFC), a static synchronous series compensator (SSSC) or any other series voltage control device with variable series impedance.

4. The method according to claim 3, wherein the UPFC contains a first and a second modular multilevel converter, wherein the first and second modular multilevel converters are connected to each other by their respective DC sides and an AC side of each of the first and second modular multilevel converters is connected to a network line of the electrical supply network.

5. The method according to claim 3, wherein the power flow control device is simulated as an additional voltage vector of a line voltage.

6. The method according to claim 1, wherein the at least one power flow control device is a phase-shifting transformer (PST).

7. The method according to claim 6, wherein the PST is simulated as a predefined phase shift of a line voltage.

8. The method according to claim 1, wherein the simulation is carried out using a mixed-integer linear programming (MILP) algorithm.

9. The method according to claim 1, which further comprises generating the model of the electrical supply network in accordance with information on a capacity of network lines of the electrical supply network.

10. A data processing configuration for controlling power flow in an electrical supply network, the data processing configuration comprising: a model generator for generating a modeled supply network of the electrical supply network, said modeled supply network providing a power flow distribution in the electrical supply network in accordance with predefined network parameters; and a simulation module for carrying out a simulation of the power flow in the modeled supply network such that at least one identified potential congestion path in the electrical supply network is identified, wherein, as a result of the simulation, a positioning scheme for at least one power flow controller is provided, such that congestion in the at least one identified potential congestion path can be avoided.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

[0022] FIG. 1 is a schematic view of a UPFC; and

[0023] FIG. 2 is a schematic view of an exemplary embodiment of a method according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0024] Referring now to the figures of the drawings in detail and first, particularly to FIG. 1 thereof, there is shown a universal power flow controller (UPFC) 1. The UPFC 1 contains a first converter unit 2 and a second converter unit 3. The first converter unit 2 has a first converter 4 which is connected via a transformer 5 and a shunt 6 in parallel to a three-phase network line 7. The first converter 4 is a so-called modular multilevel converter. It contains three parallel phase modules, wherein each of the phase modules 8-10 has two converter arms arranged between a respective AC connection and one of two DC poles 11 or 12. Every converter arm contains an arm choke and a series of submodules 13, wherein each submodule contains semiconductor switches and an energy storage, e.g. a capacitor. The semiconductor switches and the capacitor of the submodule are e.g. arranged to form a so-called half-bridge circuit, assembled to form a multilevel arrangement. Additionally, the first converter unit 2 contains a first star point reactor 14, a cooling system 15 and a control arrangement 16 configured to control and/or drive the shunt 6 and the switches of the submodules 13.

[0025] The second converter unit 3 contains a second converter 20 which is a modular multilevel converter similar to the first converter 4. The second converter 20 is on its AC side connected via a fast bypass device 17 and a transformer 18 to the network line 7. A bypass switch 19 is provided for bypassing the second converter 20. Moreover, the second converter unit 3 contains a second star point reactor 21, a cooling system 22 and a control arrangement 23 configured to control the switches of the submodules 13 and the fast bypass device 17.

[0026] The first and the second converter are connected to each other via their respective DC sides forming an intermediate DC link 11, 12.

[0027] FIG. 2 shows an example of a method in accordance with the invention. The TSO or DSO 31 performs an optimal power flow calculation in block 32 in order to manage an operation planning and the necessary switching procedures. As an output of the calculations performed by the TSO/DSO it provides an information 33 about congestion in various lines of the corresponding supply network and an information 34 about underutilized lines in the network to a grid planner 35. The grid planner defines in a block 36 target functions and other parameters of planning. It also selects a number of power flow control devices such as UPFC or PST to be used for power flow control in the supply network. A model generator in block 37 uses the information provided by block 36 and the information from the TSO/DSO for a model setup using a mixed integer linear programming for modeling the power flow in the network. In block 38 the optimization simulation is run. Given the result of the simulation, in block 39 the solutions are provided concerning the setting and other requirements for the power flow controllers. In block 40 the power flow calculation is run in order to obtain a ranking of locations for the power flow control devices. Preferably a coordinated UPFC operation is taken into account in order to solve the problem of congestions in the network. As an output of the grid planner, an information 41 about the location and also about the operation methodology is provided to the DSO/TSO 31 where a new and improved power flow calculation can be performed based on the provided information. Additionally, the results are also provided in order to facilitate the setup of requirements of new power flow controllers by their respective manufacturers in block 42.