System for operating of High Voltage Direct Current Having Grid Analysis Database Configuration Function

Abstract

A transmission / distribution system operation coordination-based HVDC operation system is provided, based on the operation of HVDC (High Voltage Direct Current) to expand supply stability, improve power quality, and enhance the economic efficiency of system operation throughout the domestic power system. The HVDC operation system is characterized by comprising: a power system management terminal that generates power system operation information; a plurality of HVDCs that generate HVDC availability information; a power market management server that generates power market operation information; distribution network operation information; a distribution system management computer that generates distribution network generation planning information and real-time distribution network generator operation information using distribution network generator bidding information and transmission system distribution network generation capacity acceptance information among the power market operation information; and an HVDC operation computer that generates HVDC operation planning information and distribution network generation capacity acceptance information based on the distribution network generation planning information, and generates real-time control information for controlling the operation of the HVDC based on the HVDC operation planning information, power system operation information, and distribution network operation information.

Description

Technology Field

[0001] The present invention relates to an HVDC operating system equipped with a database configuration function for system analysis, and more specifically, to a transmission / distribution system operation coordination-based HVDC operating system and method for expanding supply stability, improving power quality, and enhancing system operation economics based on HVDC operation, which enables consideration of the variability of distributed power sources connected to the distribution system, including large-scale renewable energy generation connected to the domestic transmission system, through the mutual sharing of market bidding / operation plans for distributed power sources participating in the power market and HVDC operation plans. Background Technology

[0002] With global efforts toward net-zero carbon neutrality, the proportion of renewable energy generation, such as wind and solar power, is increasing, and new and renewable energy generation facilities are also growing significantly in Korea. As of November 2022, the renewable energy sources connected to the domestic power grid include 7.1 GW in the transmission system and 22 GW of distributed power sources connected to the distribution system.

[0003] In addition, the current installation proportion of renewable energy generators in the entire transmission and distribution system is in the order of Jeolla (34.2%), Gyeongsang (22.2%), and Chungcheong (19.3%) by region, accounting for approximately 75.7% of the total renewable energy. Accordingly, renewable energy is installed in regions with low load demand, and since the entire amount of electricity generated cannot be consumed within the region, there is a need for measures to supply the generated electricity to the metropolitan area, where load demand is high.

[0004] In other words, the domestic power system is characterized by different locations between power generation and demand regions, and due to the uncertainty surrounding the recently increasing renewable energy generation, measures are needed to ensure a stable, high-capacity power supply and improve quality between power plants located over long distances and consumers.

[0005] Accordingly, power supply and demand plans and transmission and distribution facility plans have been established for power grid construction projects based on HVDC technology, which enables long-distance, large-capacity, low-loss transmission and system stabilization through ultra-high voltage direct current transmission, as well as the reinforcement and / or expansion of existing AC power systems.

[0006] In particular, current-type HVDC requires a relatively large site area due to the need for components such as reactive power compensation equipment and harmonic filters; however, it is widely applied to long-distance power transmission because it has low power conversion (AC↔DC) losses and enables large-capacity operation.

[0007] On the other hand, voltage-type HVDC has relatively high losses and a relatively small transmission capacity, but it enables rapid power control and can supply power while improving power quality on its own.

[0008] Recently, high-capacity technologies capable of transmitting power at the GW level or higher have been developed, and next-generation power transmission technologies are being developed to continuously expand capacity, improve stability, and reduce losses.

[0009] Currently, renewable energy connected to the power grid involves a high proportion of small-scale distributed power sources linked to both the transmission and distribution systems, suggesting potential grid impacts; however, considering the ratios of the overall load and generation in the current power system, this does not constitute a significant proportion at present and is therefore not being taken into account during transmission system operations.

[0010] In other words, the current structure of the power system is one in which power market operators adjust the output of large-scale power plants connected to the transmission system without considering small-scale distributed power sources connected to the distribution system, and the system is operated based on the reinforcement and expansion of transmission and distribution facilities.

[0011] In the case of distribution systems, operations have traditionally been based on the distribution owner reinforcing and expanding facilities as needed, and on the maintenance and management of distribution equipment.

[0012] Accordingly, as there is a possibility of supply instability issues arising from the overcapacity of distribution system lines, new systems and / or technological developments are being pursued to stably operate distribution systems connected with a high proportion of renewable energy for the realization of carbon neutrality. These include the establishment of Distribution System Operators (DSOs), the participation of small-scale Virtual Power Plants (VPPs) in the power market, and real-time market operations.

[0013] Therefore, if the proportion of renewable energy in the entire power system gradually increases with the goal of carbon neutrality and the supply of distributed power sources connected to the distribution system expands, the proportion of large-scale power plants connected to the transmission system will decrease, and the power supplied from the distribution system will increase.

[0014] In other words, the irregular output characteristics of numerous small-scale renewable energy sources connected to the distribution system may potentially cause problems in terms of the stable operation of not only the distribution system but also the transmission system. Therefore, measures are required for Distribution System Operators (DSOs) and Transmission System Operators (TSOs) to cooperate in order to ensure the stable operation of both the transmission and distribution systems, as well as the stable operation of the entire national power system. Prior art literature

[0015] 1. Republic of Korea Published Patent No. 10-2024-0013409 The problem to be solved

[0016] The present invention is proposed to resolve the problems associated with the background technology described above, and aims to provide a transmission / distribution system operation coordination-based HVDC operation system and method based on the operation of HVDC (High Voltage Direct Current) to expand supply stability, improve power quality, and enhance the economic efficiency of system operation throughout the domestic power system.

[0017] In addition, another objective of the present invention is to provide a transmission / distribution system operation coordination-based HVDC operating system and method that can be utilized for the rapid restoration of the system by utilizing the Black Start function, which is a characteristic of voltage-type HVDC, even when a power outage occurs in the transmission / distribution system. means of solving the problem

[0018] To achieve the objectives set forth above, the present invention provides a transmission / distribution system operation coordination-based HVDC operation system based on the operation of HVDC (High Voltage Direct Current) to expand supply stability, improve power quality, and enhance the economic efficiency of system operation throughout the domestic power system.

[0019] The above HVDC operating system is,

[0020] Power system management terminal that generates power system operation information;

[0021] Multiple HVDCs generating HVDC (High Voltage Direct Current) availability information;

[0022] Power market management server that generates power market operation information;

[0023] A distribution system management computer that generates distribution network generation planning information and real-time distribution network generator operation information using distribution network operation information, distribution network generator bidding information among the above power market operation information, and distribution network generation capacity acceptance information of the transmission system; and

[0024] It is characterized by including an HVDC operating computer that generates HVDC operation planning information and distribution network power acceptance information based on the above distribution network power generation planning information, and generates real-time control information for controlling the operation of the HVDC based on the above HVDC operation planning information, power system operation information, and distribution network operation information.

[0025] At this time, the HVDC operating computer is characterized by comprising: an acquisition unit for acquiring collected data including power system operation information, HVDC (High Voltage Direct Current) availability information, power market operation information, and distribution network generation plan information; an analysis unit for analyzing HVDC operating points and distribution power generation capacity acceptance information for the HVDC using the collected data; a plan setting unit for generating HVDC operation plan information for operating the HVDC using the HVDC operating points; and an operation control information generation unit for generating operation control information for operating and controlling the HVDC according to the HVDC operation plan information.

[0026] In addition, the analysis unit is characterized by configuring a database (DB) for system analysis at each point in time that reflects, based on currently operating power system operation information, facility shutdown status information for the planning time, distributed power generation plan information for the distribution system regarding the transmission / distribution interconnection point, dispatch plan information for the transmission system generator of the power market among the power market operation information, HVDC availability information, and load demand information among the power market operation information, at the time when the collected data can be acquired.

[0027] In addition, the analysis unit is characterized by calculating distribution network power acceptance information, which is the distribution network capacity that can be accepted according to the HVDC availability information, using the system analysis database (DB) for each time point.

[0028] In addition, the above-mentioned planning unit modifies the distribution network power generation plan acceptance information by applying the above-mentioned acceptable power generation capacity, and applies the modified distribution network power generation plan acceptance information to the system analysis database (DB) for each point in time to construct the finalized system analysis database (DB) for each point in time.

[0029] In addition, the above-mentioned operation control information generation unit calculates a unit-time operation range that satisfies the operation range within a certain time period using the above-mentioned database (DB) for system analysis at each determined time point, and calculates the basic operation point of the HVDC among the calculated unit-time operation ranges.

[0030] In addition, the selection of the basic operating point of the above HVDC is characterized by taking into account assumed faults or load fluctuations.

[0031] In addition, the above-described operation control information generation unit is characterized by generating HVDC operation plan information for the HVDC based on the calculated basic operating point of the HVDC and controlling the operation of the HVDC.

[0032] In addition, the above-mentioned operation control information generation unit is characterized by calculating the final operating point by reflecting the change when a change occurs in at least one of the above-mentioned power system operation information, power market operation information, distribution network generation plan acceptance information, and HVDC availability information, and setting the above-mentioned basic operating point as the final operating point when no change occurs.

[0033] In addition, the above HVDC availability information is characterized by including the operating status, availability, and outage status of the HVDC.

[0034] On the other hand, another embodiment of the present invention provides an HVDC operation method characterized by comprising: (a) a step in which a power system management terminal generates power system operation information; (b) a step in which a plurality of HVDCs generate HVDC (High Voltage Direct Current) availability information; (c) a step in which a power market management server generates power market operation information; (d) a step in which a distribution system management computer generates distribution network operation information, distribution network generator bidding information among the power market operation information, distribution network power generation capacity acceptance information of a transmission system, distribution network power generation plan information, and real-time distribution network generator operation information; and (e) a step in which an HVDC operation computer generates HVDC operation plan information and distribution network power generation plan acceptance information based on the distribution network power generation plan information, and generates real-time control information for controlling the operation of the HVDC (220) based on the HVDC operation plan information, power system operation information, and distribution network operation information.

[0035] In addition, the above step (e) is characterized by comprising: (e-1) a step in which an acquisition unit acquires collected data including power system operation information, HVDC (High Voltage Direct Current) availability information, power market operation information, and distribution network generation plan information; (e-2) a step in which an analysis unit analyzes HVDC operation points and distribution network generation capacity acceptance information for the HVDC using the collected data; (e-3) a step in which a planning setting unit generates HVDC operation plan information for operating the HVDC using the HVDC operation points; and (e-4) a step in which an operation control information generation unit generates operation control information for operating the HVDC according to the HVDC operation plan information.

[0036] In addition, the above step (e-2) is characterized by comprising the step of configuring a database (DB) for system analysis at each point in time, reflecting facility shutdown status information for the planned time point, distributed power generation information for the transmission / distribution linkage point, power market transmission system generator dispatch plan information among the power market operation information, HVDC availability information, and load demand information among the power market operation information, based on the currently operating power system operation information, at the time when the above collected data can be acquired.

[0037] In addition, the above step (e-2) is characterized by including a step in which the analysis unit calculates the acceptable generation capacity based on the HVDC available information using the system analysis database (DB) for each time point.

[0038] In addition, the above step (e-3) is characterized by including the step of the planning setting unit modifying the distribution network power generation plan acceptance information by applying the acceptable power generation capacity, and applying the modified distribution network power generation plan acceptance information to the system analysis database (DB) for each point in time to configure the finalized system analysis database (DB) for each point in time.

[0039] In addition, the above step (e-4) is characterized by including the step of the operation control information generation unit calculating a unit time-based operation range that satisfies the operation range within a certain time period using the system analysis database (DB) for each determined time point, and calculating the basic operation point of the HVDC among the calculated unit time-based operation ranges.

[0040] In addition, the above step (e-4) is characterized by including the step of the operation control information generation unit generating HVDC operation plan information for the HVDC based on the calculated basic operation point of the HVDC and controlling the operation of the HVDC.

[0041] Additionally, the above step (e-4) is characterized by comprising: a step of determining whether a change occurs in at least one of the power system operation information, power market operation information, distribution network generation plan information, and HVDC availability information by the operation control information generation unit; a step of determining the final operating point by reflecting the change if the change occurs as a result of the determination; and a step of setting the basic operating point as the final operating point if the change does not occur as a result of the determination.

[0042] On the other hand, another embodiment of the present invention provides a computer-readable storage medium that stores a program for executing the HVDC operation method described above on a computer. Effects of the invention

[0043] According to the present invention, stable power system operation and electricity quality can be maintained by considering the impact of renewable energy sources, including distributed power sources, which carry the uncertainty of the power system that increases in the future.

[0044] In addition, another effect of the present invention is that it is possible to derive an HVDC operation plan for economic effects, such as reducing power loss in the power system due to long-distance transmission, alleviating generation constraints caused by system constraints, and preventing overinvestment in power system facilities through the proper operation of HVDC.

[0045] In addition, another advantage of the present invention is that, even in the event of a power outage in the transmission / distribution system, the Black Start function, which is a characteristic of voltage-type HVDC, can be utilized for the rapid restoration of the system, thereby contributing to the minimization of losses and damages for the affected areas and system operators.

[0046] In addition, another effect of the present invention is that it is expected to ultimately provide solutions for various structural changes in the power system industry and play a greater role in enhancing the stability of the transmission system, which is the backbone of power supply.

[0047] In addition, another effect of the present invention is that, in operating the entire power system (transmission and distribution system), it is expected to compensate for the differences in operational objectives arising from operating the transmission system, distribution system, and power market separately, thereby increasing the acceptance of new and renewable energy for carbon neutrality and enabling stable operation of the power system. Brief explanation of the drawing

[0048] FIG. 1 is a conceptual diagram of power system operation according to an embodiment of the present invention. FIG. 2 is a block diagram of a High Voltage Direct Current (HVDC) operating system according to an embodiment of the present invention. Figure 3 is a detailed configuration block diagram of the HVDC operating computer shown in Figure 2. FIG. 4 is a flowchart showing an HVDC operation control process according to an embodiment of the present invention. Specific details for implementing the invention

[0049] The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0050] When describing each drawing, similar reference numerals are used for similar components.

[0051] Terms such as first, second, etc., may be used to describe various components, but said components should not be limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another.

[0052] For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and / or" includes a combination of a plurality of related described items or any of a plurality of related described items.

[0053] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which this invention pertains.

[0054] Terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0055] A High Voltage Direct Current (HVDC) operating system and method according to an embodiment of the present invention will be described in detail below with reference to the attached drawings.

[0056] FIG. 1 is a conceptual diagram of power system operation according to an embodiment of the present invention. Referring to FIG. 1, the configuration of power system operation is based on the participation of distributed power sources in the power market and the operation of the distribution system. Of course, this is just one example and may vary depending on the power industry structure and operational structure.

[0057] A distribution system operator (110) receives bids from distributed power sources participating in the distribution market (including the power brokerage market, etc.) and establishes operation plans for each power source according to the distribution system conditions. To elaborate, the distribution system operator (110) obtains distribution equipment information and load information from the distribution system and performs equipment control accordingly, and obtains bid / winning bid information from the distribution market and adjusts power generation accordingly. Examples of distribution equipment include transformers and transmission lines. The distribution market trades small-scale renewable power (e.g., solar power) and small-scale aggregated resources through auctions. Examples of small-scale aggregated resources include VPPs (Virtual Power Plants).

[0058] The distribution system operator (110) plans the operation of the distribution system by considering the market from the previous day to the real-time market, and shares the distribution system operation (generation) plan information generated in this way with the transmission system operator (120).

[0059] The transmission system operator (120) establishes a power system dispatch plan based on the power generation capacity bid from renewable energy generators connected to the transmission system, including large-scale power sources. To elaborate, the transmission system operator (120) obtains power system equipment information and power system operation information from the power system (i.e., the transmission system) and performs equipment control and maintenance on the power system. The power system is composed of power equipment and special equipment, and power equipment may include AC (Alternating Current) lines and transformers. In addition, special equipment may include HVDC (High Voltage Direct Current) and FACTS (Flexible AC Transmission System).

[0060] In addition, the transmission system operator (120) obtains generator operation information from the power market and performs power generation adjustment. The power market is a market for trading electricity related to large-scale renewable energy and large-scale power plants. Large-scale renewable energy includes solar power and wind power generation, and large-scale power plants include thermal power and nuclear power.

[0061] The transmission system operator (120) generates distribution system generation acceptance information by considering the equipment status of the power system equipment, such as power outages, maintenance, and failures, as well as system stability, such as system line load and voltage.

[0062] In addition, this is an example of a form in which the transmission system operator (120), based on regional load / generation information received from the distribution system operator (110), shares the amount of power that can be accommodated from the distribution system to the transmission system, taking into account situations such as power outages of the transmission system facilities.

[0063] This has a differentiating feature that allows for the establishment of a more stable and economical operation plan than the existing method, in that when the transmission system operator (120) operates the system, it receives distribution system operation plan information from the distribution system and considers the output fluctuation plan of the distribution network so as to reduce uncertainty regarding the generation output of renewable energy connected to the distribution network.

[0064] In addition, considering the power supplied from the distribution network and the output of renewable energy connected to the transmission system, it is necessary to conduct a preliminary review and establish a plan for the operation of HVDC that supplies power from generation areas to load consumers.

[0065] This is because, when transmitting large-capacity power, operating at an inappropriate capacity can lead to problems maintaining stability throughout the power system and result in losses due to inefficient operation.

[0066] FIG. 2 is a block diagram of a High Voltage Direct Current (HVDC) operating system (200) according to an embodiment of the present invention. Referring to FIG. 2, the HVDC operating system (200) may be configured to include a power system management terminal (210) that generates power system operation information, an HVDC (220) that generates HVDC availability information, a power market management server (230) that generates power market operation information, an HVDC operating computer (240) that generates HVDC operation planning information and distribution network power generation acceptance information based on distribution network power generation planning information, and generates real-time control information that controls the operation of the HVDC based on HVDC operation planning information, power system operation information, and distribution network operation information, and a distribution system management computer (250) that generates distribution network power generation planning information and real-time distribution network generator operation information using distribution network operation information (or referred to as distribution end operation information), distribution network generator bidding information among power market operation information, and distribution network power generation acceptance information of the transmission system.

[0067] The power system management terminal (210) generates power system operation information having information regarding the operation of the power system, equipment outage status information having information regarding the outage status of power system equipment, etc. The power system operation information may include SCADA (Supervisory Control and Data Acquisition) data, PMU (synchronous phasor measurement unit) data, etc. SCADA data is data collected from sensors installed in major facilities of the power grid, such as substations, power plants, transmission lines, and distribution lines.

[0068] PMU data is high-precision, regionally time-synchronized data obtained by installing a relay with the function of a PMU (Phasor Measurement Unit) in a substation to receive time information from a satellite (GPS) at an acquisition cycle of 120 samples per second regarding voltage, current, frequency, active power, reactive power, etc. The main purpose of installing a PMU is to acquire and monitor time-synchronized data over a wide area.

[0069] HVDC (220) is a high voltage direct current transmission technology. Through DC-based ultra-high voltage transmission technology, it can reduce losses in long-distance power transmission and improve power quality and / or system stability by controlling power flow in the power system. This HVDC is classified into voltage-type (VSC: Voltage Source Converter) HVDC and current-type (LCC: Line Commutated Converter) HVDC depending on the technology implementation and applied components, and is classified into PTP (Point to Point), BTB (Back to Back), and MTDC (Multi-Terminal DC) depending on the converter construction method.

[0070] HVDC is being installed for purposes such as large-capacity power transmission, improved system reliability, and inter-country power exchange, and its environmental and economic benefits can be verified in comparison to AC power systems where power flow control is impossible.

[0071] The HVDC (220) generates HVDC availability information and transmits it to the HVDC operation computer (240). Of course, the HVDC (220) receives HVDC operation planning information and real-time operation control information from the HVDC operation computer (240) and performs operations. HVDC availability information may include operation, availability, and power outage status. Although it is depicted as a single HVDC (220) for convenience in FIG. 2, it is composed of multiple HVDCs. Of course, these HVDCs may be configured in parallel in one location or configured in each region.

[0072] The power market management server (230) generates power market operation information and transmits it to the HVDC operation computer (240). The power market management server (230) conducts power trading between bidders and successful bidders and generates power market operation information based on the power trading. Examples of power market operation information include generator dispatch, reserve power (i.e., reserve power), and distribution network generator bidding information.

[0073] The HVDC operation computer (240) performs the function of establishing an HVDC operation plan and generating information on power generation capacity that can be accepted from the distribution network (such as distribution network power generation capacity acceptance information) using the power system operation information, power market operation information, and HVDC availability information, and generating real-time operation control information that controls the operation of the HVDC (220) by acquiring real-time fluctuations in the transmission system during operation based on the HVDC operation plan information, power system operation information, and distribution network operation information.

[0074] Of course, the HVDC operation computer (240) is connected to the distribution system management computer (250) and receives distribution network power generation plan information, real-time distribution network generator operation information, etc. from the distribution system management computer (250), generates HVDC operation plan information by reflecting this, and generates real-time operation control information to control the operation of the HVDC (220) based on this HVDC operation plan information. Of course, real-time fluctuation acceptance information is also generated and provided to the distribution system management computer (250).

[0075] In this case, the HVDC operating computer (240) transmits distribution network power generation acceptance information, real-time fluctuation information, etc., for a distribution network real-time operation plan to the distribution system management computer (250).

[0076] The distribution system management computer (250) generates distribution network power generation planning information based on power generation acceptance information based on the transmission system connection point obtained from the HVDC operation computer (240).

[0077] To elaborate, the distribution system management computer (250) determines the distribution network generation plan based on the bidding or operation plan and forecast of the distributed power generation amount, the power outage plan of the distribution facility, and the distribution network generation capacity of the transmission system connection point received from the transmission operator, and transmits it to the HVDC operation computer (240).

[0078] The HVDC operating computer (240) receives power generation planning information of a power source in the distribution network from the distribution system management computer (250), generates final HVDC operation planning information, generates real-time operation control information such as active / reactive power control and voltage control of the HVDC based on real-time distribution network information and change information such as faults, outages, and load fluctuations of the transmission system obtained from a terminal device, and transmits this to the HVDC (220).

[0079] In FIG. 2, a communication network (not shown) has been omitted for ease of understanding, but a communication network can be configured between each component. A communication network refers to a connection structure capable of exchanging information between each node, such as multiple terminals and servers, and can be a Public Switched Telephone Network (PSTN), Public Switched Data Network (PSDN), Integrated Services Digital Networks (ISDN), Broadband Integrated Services Digital Network (BISDN), Local Area Network (LAN), Metropolitan Area Network (MAN), Wide Area Network (WLAN), Trunked Radio System (TRS, Digital Trunked Radio System D-TRS), etc.

[0080] However, the present invention is not limited thereto and may be wireless communication networks such as CDMA (Code Division Multiple Access), WCDMA (Wideband Code Division Multiple Access), Wibro (Wireless Broadband), WiFi (Wireless Fidelity), DLNA (Digital Living Network Alliance), Zigbee, Z-wave, HSDPA (High Speed ​​Downlink Packet Access) networks, Bluetooth, RFID (Radio Frequency Identification), Infrared Data Association (IrDA), Ultra-wide Band, Wireless USB (Wireless Universal Serial Bus), NFC (Near Field Communication) networks, satellite broadcasting networks, analog broadcasting networks, DMB (Digital Multimedia Broadcasting) networks, etc. Alternatively, it may be a combination of these wired and wireless communication networks. Furthermore, the communication network may include a power communication network.

[0081] A power communication network refers to a network configured for communication by flowing data signals over existing power lines using Power Line Communication (PLC) technology. Power lines consist of high-voltage power lines (approx. 220V or higher) and / or low-voltage power lines (approx. 110–220V). In addition, the power communication network is composed of repeaters, power communication modems, transformers, etc. The master modem performs the function of connecting the power communication network to the existing communication network.

[0082] FIG. 3 is a detailed block diagram of the HVDC operating computer (240) illustrated in FIG. 2. Referring to FIG. 3, the HVDC operating computer (240) may be configured to include an acquisition unit (310), an analysis unit (320), a planning setting unit (330), an operation control information generation unit (340), a display unit (350), etc.

[0083] The acquisition unit (310) is connected to a communication network (not shown) and performs the function of acquiring data from a power system management terminal (210), HVDC (220), power market management server (230), distribution system management computer (250), etc. It acquires collected data such as power system operation information, HVDC (High Voltage Direct Current) availability information, power market operation information, and distribution network generation plan information. To this end, the acquisition unit (310) may be configured to include a modem, a microprocessor, memory, etc.

[0084] The analysis unit (320) performs the function of analyzing the HVDC operating point and distribution network power generation capacity acceptance information for the HVDC using data collected through the acquisition unit (310). In particular, the analysis unit (320) can calculate the distribution network power generation capacity acceptance information, which is the distribution network acceptable power generation capacity according to the HVDC availability information, by using a system analysis database (DB) for each time point.

[0085] The planning unit (330) performs the function of generating HVDC operation planning information using HVDC operating points. Specifically, it derives the hourly operating points of each HVDC based on economic operation, such as HVDC response characteristics, equipment availability information, and system loss reduction. Of course, a review process through a transmission system operator may be included.

[0086] Based on these hourly operating points, an HVDC operation plan is established to generate HVDC operation plan information, which is then finalized. Finalization may be performed using a pre-built verification algorithm or manually verified by a system operator.

[0087] The operation control information generation unit (340) generates operation control information for operating and controlling the HVDC (220) according to the HVDC operation plan information and performs the function of transmitting this information to the HVDC (220). In addition, the operation control information generation unit (340) calculates the final operating point by reflecting the change if a change occurs in at least one of the power system operation information, power market operation information, distribution network generation plan information, and HVDC availability information, and if no change occurs, the basic operating point is set as the final operating point.

[0088] The display unit (350) performs the function of outputting a setting screen, a selection menu, data being processed, etc., so that the system operator can check them. To this end, the display unit (350) may be configured to include a display and a sound system. The display may be an LCD (Liquid Crystal Display), an LED (Light Emitting Diode) display, a PDP (Plasma Display Panel), an OLED (Organic LED) display, a touch screen, a CRT (Cathode Ray Tube), a flexible display, a micro LED, a mini LED, etc. In the case of a touch screen, it may be used as an input means as well as an output means.

[0089] The analysis unit (320), plan setting unit (330), and operation control information generation unit (340) illustrated in FIG. 3 represent a unit that processes at least one function or operation, and this can be implemented in software and / or hardware. In hardware implementation, it can be implemented as an application specific integrated circuit (ASIC), digital signal processing (DSP), programmable logic device (PLD), field programmable gate array (FPGA), processor, microprocessor, other electronic unit, or a combination thereof designed to perform the above-mentioned function.

[0090] In software implementation, software constituent components (elements), object-oriented software constituent components, class constituent components and task constituent components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, data, databases, data structures, tables, arrays, and variables may be included. Software, data, etc. may be stored in memory and executed by a processor. Memory or processors may employ various means well known to those skilled in the art.

[0091] FIG. 4 is a flowchart showing an HVDC operation control process according to an embodiment of the present invention. Referring to FIG. 4, the analysis unit (320) constructs a database (DB) for system analysis at each point in time that reflects facility shutdown status information for the planning time, distribution system distributed power generation plan information for the transmission / distribution linkage point, power market transmission system generator dispatch plan information among power market operation information, HVDC availability information, and load demand information among power market operation information, based on currently operating power system operation information, in order to establish an HVDC operation plan (step S410).

[0092] To elaborate, the transmission / distribution interconnection point is the point where the transmission system and the distribution system are connected, and it may vary depending on the structure of the power industry. In other words, based on the operational scopes of the transmission system operator and the distribution system operator, it refers to a point where power generation and load information connected to the lower-level distribution system is aggregated to supply or receive power to the upper-level transmission system. Based on the domestic power system operation structure, the 154 / 22.9 substation can be cited as an example.

[0093] Afterward, the analysis unit (320) calculates the acceptable generation capacity based on the operation of the HVDC (220) (i.e., available HVDC information) using a database (DB) for system analysis at each point in time (step S420). At this time, the influence range of each HVDC is set and assumed conditions (e.g., fault, load fluctuation) are considered. Of course, the distribution network power acceptance information, which is the acceptable generation capacity, can be provided to the distribution system operator as information and shared.

[0094] Subsequently, the planning unit (330) performs modifications to the distribution network power generation plan acceptance information by reflecting the acceptable power generation capacity, and applies this to the system analysis database (DB) for each point in time to configure the finalized system analysis database (DB) for each point in time for analysis (step S430). In this case, the modified distribution network power generation plan acceptance information can be provided to the distribution system operator (i.e., the distribution system operator's terminal) to share the information, and the modified distribution network power generation plan acceptance information is finalized through a response from the distribution system operator's terminal.

[0095] Subsequently, the operation control information generation unit (340) analyzes the database (DB) for system analysis for each confirmed time point to calculate the operating range of the HVDC for each time point (i.e., the appropriate operating range) and aggregates the operating range of the HVDC for each time point into a fixed unit of time. In addition, it reflects the characteristics of each HVDC (e.g., changes in operating point, equipment impact) and calculates the operating range per unit of time that satisfies the operating range for each time point within the time. In addition, among the selected operating range per unit of time, it calculates the basic operating point of the HVDC for the efficient operation of the power system (step S440).

[0096] To elaborate, based on the configured database for system analysis, the HVDC operating point is selected considering assumed faults and load (generation) fluctuations. However, if the HVDC, which is a special power facility custom-made to suit system conditions based on power electronic equipment, rapidly changes its operating point within a short period or operates under somewhat excessive conditions, problems such as overload, aging, and cooling may occur in the components of the HVDC facility. Therefore, the operating range for the entire duration of the operation plan is calculated by considering the characteristics of each facility and component.

[0097] To elaborate, the goal is to maintain the supply-demand balance and / or power quality of the power system by considering assumed scenarios. Additionally, common vulnerability situations among the assumed scenarios are classified into cases, and HVDC control measures are derived.

[0098] Subsequently, the operation control information generation unit (340) generates each HVDC operation plan information based on the basic operation point (step S450). Of course, it is also possible to transmit the HVDC operation plan information to the transmission system operator and make a final decision after receiving confirmation from the transmission system operator.

[0099] Afterwards, the operation control information generation unit (340) checks in real time whether there is a change in information such as power system operation information, power market operation information, distribution network generation plan information, and HVDC availability information (step S460).

[0100] Upon verification, if an information change occurs in step S460, steps S410 through S460 are repeated. That is, the basic operating point is recalculated to reflect the change.

[0101] In contrast, if no information change occurs in step S460, the operation control of the HVDC (220) is performed with the basic operating point as the final operating point (step S470).

[0102] To elaborate, using collected data such as power system operation information, HVDC (High Voltage Direct Current) availability information, power market operation information, and distribution network generation planning information, the appropriate HVDC operation range by time point, the appropriate HVDC operation range per unit time based on the time point operation range, identification of system vulnerabilities, and classification of assumed cases are analyzed.

[0103] Additionally, the steps of the method or algorithm described in connection with the embodiments disclosed herein may be implemented in the form of program instructions that can be executed through various computer means, such as a microprocessor, a processor, a CPU (Central Processing Unit), etc., and recorded on a computer-readable medium. The computer-readable medium may include program (instruction) code, data files, data structures, etc., either alone or in combination.

[0104] The program (instruction) code recorded on the above medium may be those specifically designed and configured for the present invention, or those known and available to those skilled in the art of computer software. Examples of computer-readable recording media may include magnetic media such as hard disks, floppy disks, and magnetic tapes; optical recording media such as CD-ROMs, DVDs, and Blu-rays; and semiconductor memory devices specifically configured to store and execute program (instruction) code, such as ROM (Read Only Memory), RAM (Random Access Memory), and flash memory.

[0105] Here, examples of program (instruction) code include not only machine code, such as that generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter, etc. The aforementioned hardware device may be configured to operate as one or more software modules to perform the operation of the present invention, and vice versa. Explanation of the symbols

[0106] 110: Distribution system operator 120: Transmission system operator 200: HVDC (High Voltage Direct Current) Operating System 210: Power System Management Terminal 220: HVDC 230: Power Market Management Server 240: HVDC Operation Computer 250: Distribution System Management Computer 310: Acquisition Department 320: Analysis Department 330: Plan setting unit 340: Operation control information generation unit 340: Display unit

Claims

Claim 1 A power system management terminal (210) that generates power system operation information; a plurality of HVDCs (220) that generate HVDC (High Voltage Direct Current) availability information; a power market management server (230) that generates power market operation information; a distribution system management computer (250) that generates distribution network generation planning information and real-time distribution network generator operation information using distribution network operation information, distribution network generator bidding information among the power market operation information, and distribution network power generation capacity acceptance information of the transmission system; and an HVDC operation computer (240) that generates HVDC operation planning information and distribution network power generation capacity acceptance information based on the distribution network generation planning information, and generates real-time control information that controls the operation of the HVDC based on the HVDC operation planning information, power system operation information, and distribution network operation information. The HVDC operating computer (240) comprises: an acquisition unit (310) for acquiring collected data including power system operation information, HVDC (High Voltage Direct Current) availability information, power market operation information, and distribution network generation plan information; an analysis unit (320) for analyzing HVDC operating points and distribution network generation capacity acceptance information for the HVDC (220) using the collected data; a plan setting unit (330) for generating HVDC operation plan information for operating the HVDC (220) using the HVDC operating points; and an operation control information generation unit (340) for generating operation control information for operating and controlling the HVDC (220) according to the HVDC operation plan information.An HVDC operating system having a system analysis database configuration function, wherein the analysis unit (320) comprises, at the time when the collected data can be acquired, a database (DB) for system analysis for each time point reflecting facility shutdown status information for the planning time point, distribution system distributed power generation plan information for the transmission / distribution linkage point, power market transmission system generator dispatch plan information among the power market operation information, HVDC availability information, and load demand information among the power market operation information, wherein the HVDC availability information includes the operating status, availability, and shutdown status of the HVDC (220).

Images