KR-102964424-B1 - SYSTEM FOR OPERATING DISTRIBUTION NETWORK AND METHOD THEREOF

KR102964424B1KR 102964424 B1KR102964424 B1KR 102964424B1KR-102964424-B1

Abstract

The present invention discloses a distribution network operation system and a method thereof. The distribution network operation system of the present invention is characterized by comprising: an energy market for matching the power supply and demand of the entire system and demand; a power system auxiliary service for maintaining the stable operation of the system in case of an emergency, which directs dispatch according to winning bid information and frequency constraint occurrences, and provides distributed power source market information and dispatch information to a distribution system operation server; an integrated power plant operation server that predicts the amount of power generation resources based on individual distributed power sources participating in the power market and a virtual power plant aggregating distributed power sources to establish an all-day market bidding plan, generates power according to the winning bid results and the all-day operation plan, and controls the output of power generation by each distributed resource according to a request for power generation control; and a distribution system operation server that receives a bidding plan for the power market bidding from the integrated power plant operation server, controls the all-day market bidding, acquires real-time distributed resource information to monitor the distribution system, analyzes potential constraints, and operates the real-time distribution system.

Inventors

진윤선
박중성
황성욱

Assignees

한국전력공사

Dates

Publication Date: 20260513
Application Date: 20221021

Claims (13)

A power system operation server that operates an energy market to match the power supply and demand of the entire system and power system auxiliary services to maintain the stable operation of the system in case of an emergency, directs power dispatch based on winning bid information and frequency constraints, and provides distributed power market information and dispatch information to a distribution system operation server; An integrated power plant operation server that predicts the amount of power generated by power generation resources based on individual distributed power sources participating in the power market and a virtual power plant aggregating distributed power sources, establishes a daily market bidding plan, generates power according to the winning bid results and the daily operation plan, and controls the output of power generated by each distributed resource according to a request for power generation control; and A distribution system operation server that receives a bidding plan for power market bidding from the integrated power plant operation server, controls the daily market bidding, acquires real-time distributed resource information to monitor the distribution system, analyzes potential constraints, and operates the real-time distribution system; A distribution network operation system characterized by the above-mentioned distribution system operation server collecting the planned installation locations, types, and characteristics of individual distributed resources to be operated by the above-mentioned integrated power plant operation server, simulating the spare capacity of the distribution line and situations that may occur in the distribution system to provide a site selection recommendation service for securing economic feasibility, and providing results of a comparative analysis of the profit obtainable through the virtual power plant and the case of bidding as an individual distributed power source through matching with a nearby virtual power plant.
A distribution network operation system according to claim 1, characterized in that the distribution system operation server controls the all-day market bidding plan requested by the integrated power plant operation server based on the overall demand forecast results, calculates and transmits a modified bidding guideline, and controls the all-day market bidding.
A distribution network operation system according to claim 1, wherein the distribution system operation server receives real-time variable operation information by distributed resource from the integrated power plant operation server and receives a request for frequency auxiliary service response according to transmission network operation from the power system operation server to control the distribution system in real time, determines whether a constraint has occurred, derives the amount of power generated by each distributed resource, and transmits it to the integrated power plant operation server and the power system operation server.
A distribution network operation system characterized in that, in paragraph 3, the integrated power plant operation server controls the output of power generation by each distributed resource depending on whether a distribution constraint occurs, or outputs the frequency auxiliary service response amount along with the previous day's winning bid power generation amount when the frequency auxiliary service response is requested from the power system operation server.
A distribution network operation system according to claim 1, wherein the distribution system operation server receives resource information of distributed resources from the integrated power plant operation server, classifies markets where participation is possible based on the type and characteristics of distributed resources, and recommends an optimal bidding capacity based on the transaction unit price according to the markets where participation is possible.
delete
A step in which the integrated power plant operation server establishes a daily market bidding plan using the predicted generation amount of power generation resources and requests verification from the distribution system operation server; A step in which the above-mentioned distribution system operation server receives a request for verification of the previous day market bidding plan, predicts total demand, and performs flow analysis; A step in which the above-mentioned distribution system operation server performs power flow analysis to determine system stability and calculates and transmits a modified bidding guide to the above-mentioned integrated power plant operation server; A step of the above integrated power plant operation server bidding to the power system operation server when the final bid is determined based on the modified bidding guide of the above distribution system operation server; and The method includes the step of the power system operation server executing the previous day's operation plan based on the previous day's wholesale market operation results and transmitting the market bidding results and the previous day's operation plan to the integrated power plant operation server and the distribution system operation server; A step in which the above distribution system operation server receives input of the planned installation location, type, and characteristics of individual distributed resources to be operated by the above integrated power plant operation server; A step in which the above-mentioned distribution system operation server simulates the spare capacity of the distribution line and situations that may occur in the distribution system based on the planned installation location, type, and characteristics of individual distributed resources; and A distribution network operation method characterized by further including the step of the above-mentioned distribution system operation server providing a service for recommending the location selection of individual distributed resources to secure economic feasibility based on simulation results, and providing results of a comparative analysis of the profit obtainable through the virtual power plant and the case of bidding as an individual distributed power source through matching with a nearby virtual power plant.
A distribution network operation method according to claim 7, wherein the step of calculating and transmitting the modified bid guide is repeated until the distribution system operation server determines the system stability and the convergence of the modified bids is confirmed so that the distribution network reaches a stable state.
In Article 7, A step in which the above integrated power plant operation server transmits real-time fluctuation operation information of distributed resources to the above distribution system operation server; A step in which the above power system operation server transmits a request for a frequency auxiliary service response according to the operation of the transmission network to the above integrated power plant operation server and the above distribution system operation server; A step in which the above-mentioned distribution system operation server performs real-time distribution system power flow analysis based on control request information in response to a frequency auxiliary service response request to derive the amount of power generated by each distributed resource; and A distribution network operation method characterized by further including the step of the distribution system operation server transmitting the amount of power generated by each distributed resource to the integrated power plant operation server and the power system operation server.
In Clause 9, the step of the integrated power plant operation server determining whether a distribution constraint has occurred; A step of outputting the previous day's winning bid generation amount and the frequency auxiliary service response amount according to whether the frequency auxiliary service responds, when the integrated power plant operation server determines whether the distribution constraint has occurred and it is determined that the distribution constraint has occurred; and A distribution network operation method characterized by further including the step of controlling output based on the amount of power generated by each distributed resource when the integrated power plant operation server determines whether the distribution constraint has occurred and, as a result, it determines that no distribution constraint has occurred.
A distribution network operation method according to claim 9, wherein the step of transmitting the frequency auxiliary service response request is characterized in that the distribution system operation server transmits the frequency auxiliary service response request when there is a supply and demand imbalance in the transmission system or when frequency control is required.
In Article 7, A step in which the above distribution system operation server receives resource information of distributed resources from the above integrated power plant operation server; A step in which the above-mentioned distribution system operation server classifies potential markets for participation based on the types and characteristics of distributed resources; and A distribution network operation method characterized by further including the step of the above-mentioned distribution system operation server recommending an optimal bidding capacity based on transaction unit prices according to the market in which participation is possible.
delete

Description

System for Operating Distribution Network and Method Thereof The present invention relates to a distribution network operation system and a method thereof, and more specifically, to a distribution network operation system and a method thereof that enables the activation of power trading of distributed power sources and the stable operation and management of a distribution system through coordinated operation between a transmission system operator performing power trading of distributed power sources, a distribution system operator operating a distribution system to which distributed power sources are connected, and a virtual power plant that integrates and operates distributed power sources. Under the goal of carbon neutrality, the deployment of distributed power sources is continuously expanding, and research for stable supply and efficient demand is actively underway in various fields. In particular, as the share of renewable energy continues to expand to increase distributed energy and small-scale distributed power sources grow, it is time to rapidly secure technologies for grid stabilization. Domestic energy transition is primarily driven by the expansion of renewable energy, with Virtual Power Plant (VPP) technologies and systems playing a key role in ensuring stable supply and enhancing the visibility of small-scale distributed power sources. Although a small-scale power brokerage market was introduced to promote efficient grid operation by ensuring visibility of distributed power sources, domestic VPPs face limited business models due to restrictions on recruitment resources and capacity, as well as inadequate market regulations. Consequently, securing economic viability is difficult, delaying the activation of VPPs. Furthermore, the absence of operational rules for brokerage transactions—such as the review of network constraints by distribution network operators—raises concerns for grid operators regarding increased uncertainty in the distribution system when conducting brokerage transactions. Considering that power trading types and the types of consumers using the power grid will become increasingly diverse in the future, market entry barriers for brokers can be lowered through brokerage market operating rules and systems that account for the impact of distributed sources on the distribution network. This will be achieved by enabling the provision of services by distribution operators, such as "services recommending trading types by distributed resource type" and "services recommending distributed source site selection," when brokers participate in the power market. With the expansion of renewable energy sources, which have significant output variability due to changes in weather and climate conditions, it is becoming difficult to maintain real-time supply and demand balance and respond to volatility relying solely on a day-ahead market centered on traditional fossil fuel generators. Accordingly, the Korea Power Exchange plans to transition its market system, which involves opening a day-ahead market to establish a 24-hour supply plan in one-hour increments for the following day, to a parallel system with a real-time ancillary services market in 15-minute increments. In addition, it is improving the market system to enable renewable energy sources of a certain size or larger that meet requirements to participate in power market bidding and trade electricity in the same way as conventional power generators. The real-time market subdivides prices by shortening the market price interval from the existing 1 hour to 15 minutes. To do this, the power market must be opened every 15 minutes after the previous day's market. In addition, the ancillary services market is a market designed to compensate for the appropriate value of providing flexibility, and aims to secure flexibility resources cost-effectively by opening the market in 15-minute intervals. Accordingly, the ancillary services market consists of a primary reserve (700 MW) that responds within 10 seconds and maintains output for 5 minutes or more, a frequency control reserve (1000 MW) that responds within 5 minutes and maintains output for 30 minutes or more, a secondary reserve (1400 MW) that responds within 10 minutes and maintains output for 30 minutes or more, and a tertiary reserve (1400 MW) that responds within 30 minutes. The background technology of the present invention is disclosed in Korean Published Patent Application No. 10-2022-0035688 (published March 22, 2022, Method for Integrated Operation of Distributed Resources). FIG. 1 is a block diagram showing a distribution network operation system according to one embodiment of the present invention. FIG. 2 is a flowchart illustrating the all-day market control function according to the distribution network operation method according to one embodiment of the present invention. FIG. 3 is a flowchart illustrating a real-time distribution system operation function according to a distributi