Distribution Network Control Areas for Renewable Power Balancing
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Solution Overview
Problem
The integration of renewable energies into electrical distribution networks is complex due to fluctuations in output power from sources like wind turbines and photovoltaic systems, leading to operational challenges in maintaining power balance and ensuring operational safety, especially with decentralized power feed-in and varying load conditions.
Innovation Solution
A method is proposed where the electrical distribution network is divided into control areas, each with a wind farm and consumers, controlled by a network control center. This center sets active and reactive power setpoints to balance generated and consumed power, allowing for optimized power exchange between areas, using a deployment plan that maximizes renewable energy integration and flexibility in the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If renewable energy generators (wind turbines, photovoltaic systems) are integrated into the electrical distribution network, then the use of renewable energy increases, but the operational complexity and difficulty of maintaining power balance increase due to output power fluctuations
Solution Approach 1:
The electrical distribution network is divided into multiple control areas, each managed by a dedicated control area controller. This segmentation allows decentralized control of renewable energy integration, where each control area can independently manage its own power balance and renewable energy sources, reducing the overall complexity at the central control level.
Solution Approach 2:
The control area controllers dynamically adjust the operation of renewable energy generators based on real-time conditions. The controllers modify setpoints for active and reactive power output according to actual load demands and renewable energy availability, enabling flexible adaptation to power fluctuations without requiring complex centralized control mechanisms.
2Reliability
If control mechanisms are increased to compensate for power deviations, then operational safety is improved, but the device complexity and control effort increase considerably
Solution Approach 1:
Control area controllers continuously monitor the actual power output of renewable energy generators and the load conditions within their control areas. Based on this feedback, the controllers automatically adjust generator setpoints to maintain power balance and prevent deviations that could compromise operational safety, eliminating the need for multiple additional control mechanisms.
Solution Approach 2:
Each control area controller independently manages its own control area without requiring constant intervention from central control or additional external control mechanisms. The controller autonomously balances generation and consumption by adjusting renewable energy generator output, making the system self-regulating and reducing overall control complexity.
3Adaptability or versatility
If renewable energy generators operate with decentralized distribution and different power feed-in characteristics, then renewable energy integration flexibility increases, but the controllability of generators decreases
Solution Approach 1:
Control area controllers pre-establish operational constraints and capability boundaries for each renewable energy generator based on their technical characteristics and environmental conditions. By defining these boundaries in advance, the controllers can quickly adjust generator output within permissible ranges without complex real-time negotiations, maintaining both flexibility and controllability.
Data Source
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AI summary
The invention relates to a method for controlling an electrical distribution network (400), a network control centre (458) being provided to control the electrical distribution network (400), and the electrical distribution network comprising a plurality of control areas (482, 486), wherein each control area outputs to or receives from the electrical distribution network (400) an interchange power (PAI), and wherein at least one of the control areas (482) has at least one generator, in particular a wind farm (410), for generating a generator power (PGW) and also at least one consumer (420) for receiving a consumer power (PZ1), at least one control area controller (484) being provided to control the at least one generator or wind farm (410). The method comprises the steps: the control area controller (484) receives from the network control centre (458) a value of an interchange power (PAS) to be set, the interchange power (PAS) being defined as a difference between the consumer power (PZ1) and the generator power (PGW); the control area controller (484) creates an operation plan to maintain or achieve the interchange power (PAS) to be set, wherein the operation plan is provided to control the generators (410) and consumers (420) and is created such that a difference between the interchange power (PAI) achieved and the interchange power (PAS) to be set is minimal; and electrical power (PGW) is generated by means of the at least one generator or one wind farm (410) according to the operation plan.