CN-121984106-A - Interconnected power grid mutual-protection mutual-aid scheduling method based on credit difference pricing and PTDF constraint

Abstract

The invention relates to the technical field of power systems, and discloses a mutual-protection mutual-aid scheduling method of interconnected power grids based on credit difference pricing and PTDF constraint, which comprises the steps of constructing a regional coordination optimization model and a main body response optimization model; the regional coordination optimization model is used as an upper layer decision model, aims at comprehensively optimizing multiple targets of settlement expenditure, safety out-of-limit, load shortage and electricity abandoning punishment, the main body response optimization model is a lower layer execution unit, main bodies at each power transmission side perform optimization output on the premise of meeting unit operation constraint by taking internal power generation cost minimization as a target after receiving a power transmission instruction of the upper layer decision model, and a scheduling scheme is obtained by solving the regional coordination optimization model and the main body response optimization model. The invention has the advantages that on the premise of increasing the running cost of the system in a limited way, the power supply reliability, the safety toughness and the resource allocation efficiency of the interconnected power grid are improved obviously, and the cooperative optimization of economy, safety and credit value is realized.

Inventors

• WEN XU
• YANG YANG
• FAN DONG
• LUO BAOSONG
• ZHOU SIYUAN
• WU YUQUAN
• ZHOU QUAN

Assignees

• 国家电网有限公司西南分部

Dates

Publication Date

20260505

Application Date

20251201

Claims (5)

1. 1. The interconnected power grid mutual-protection mutual-aid dispatching method based on credit difference pricing and PTDF constraint is characterized by comprising the following steps of, Constructing a regional coordination optimization model and a main body response optimization model; The regional coordination optimization model is used as an upper layer decision model, and aims at minimizing the weighted sum of settlement expenditure, safety out-of-limit, load shortage and power discarding punishment; the main body response optimization model is a lower execution unit, and after receiving the power transmission instruction of the upper decision model, each power transmission side main body optimizes the output on the premise of meeting the unit operation constraint by taking the internal power generation cost as a target; And finally, an interconnected power grid dispatching scheme with economical efficiency, safety and reliability is generated by carrying out distributed solving based on target cascading on the double-layer model and introducing an online rolling optimization mechanism.
2. 2. The interconnected network mutual-protection and mutual-help scheduling method based on credit difference pricing and PTDF constraint of claim 1, wherein the objective function of the regional coordination optimization model is: ; ; ; ; ; ; ; In the formula, To settle the expenditure; Safety out-of-limit cost; is the cost of shortage; to discard wind and light costs; Is a weight factor; is the transmission power from the power transmitting side s to the power receiving side r in the period t; the load shortage of the power receiving party r in the period t is provided; Wind and light availability; is the actual access quantity; Is a relaxation variable; Is the lowest rate of digestion; credit score for the power receiver in period t When the power transmitter s purchases power, a unit price to be paid is actually required.
3. 3. The interconnected grid mutual-protection mutual-aid scheduling method based on credit difference pricing and PTDF constraint of claim 1, wherein the constraint conditions of the regional coordination optimization model comprise: Constrained by the power balance at the receiving end: ; In the formula, Is the load of the power receiving party; is externally powered; the load shortage of the power receiving party r in the period t is provided; Constrained by the end budget: ; In the formula, Is a pre-calculated upper limit; Power transfer distribution factor line safety constraints: ; In the formula, Is a margin coefficient; Is the upper limit of line capacity; Is a relaxation variable; Credit blacklist mechanism: ; In the formula, For the credit score to be given, Threshold for credits; credit differential pricing mechanism: ; ; In the formula, As a reference price to be used in the present invention, Is a credit coefficient; For credit premium slope for quantifying current credit score Above 0.9, the electricity price premium amplitude obtained per unit credit score is increased; For credit discount slope for quantifying current credit score Below 0.7, the electricity price discount amplitude corresponding to each unit credit score is reduced.
4. 4. The interconnected grid mutual-protection mutual-aid scheduling method based on credit difference pricing and PTDF constraint of claim 3, wherein the objective function of the main body response optimization model is: ; ; In the formula, A total power generation cost function of the power transmission party s; the total cost of thermal power operation; the total cost of hydropower operation; Is the total running cost of nuclear power; The total cost of operation for pumped storage; The method comprises the steps of outputting power for thermal power in a t period; exerting force for the water and electricity in a period t; the output force of the nuclear power is generated in the t period; 、 pumping and discharging power of the pumped storage in the period t are respectively.
5. 5. The interconnected grid mutual-protection mutual-aid scheduling method based on credit difference pricing and PTDF constraint of claim 4, wherein the constraint conditions of the subject response optimization model comprise: transmitting end power balance constraint: ; Upper and lower limit constraint of water and fire unit output: ; ; In the formula, 、 、 、 The output limit values of the water and fire machine sets are respectively; nuclear power trimming bandwidth constraint: ; In the formula, Is the rated power of the nuclear power, Is a nuclear power output neighborhood; Pumped storage dynamic model: ; ; ; ; In the formula, Energy storage for pumped storage in a period t; 、 respectively pumping water and electricity; 、 respectively pumping water and electricity, and the upper limit of the power generation; 、 Respectively the upper limit and the lower limit of the pumping storage capacity; Pumped storage charge-discharge mutual exclusion constraint: ; ; ; In the formula, Is a binary variable.

Description

Interconnected power grid mutual-protection mutual-aid scheduling method based on credit difference pricing and PTDF constraint Technical Field The invention relates to the technical field of power systems, in particular to a mutual-protection mutual-aid scheduling method of interconnected power grids based on credit difference pricing and PTDF constraint. Background The power grid in China faces increasingly severe peak regulation pressure and frequent extreme weather events, and the traditional scheduling mode is difficult to consider economical efficiency, safety and standardization of market main behaviors when dealing with inter-regional power mutual assistance. Particularly in the interconnected power grid with multi-main participation, the lack of an effective credit incentive mechanism and a network constraint quantification means leads to low resource allocation efficiency, limited new energy consumption capability and insufficient risk resistance capability of the system. Therefore, it is needed to construct a scheduling method capable of integrating a market credit mechanism and power grid physical characteristics, and improving the synergistic efficiency of cross-regional mutual protection under the premise of ensuring safe and stable operation of the power grid. In order to cope with these challenges, the existing literature [1] builds an inter-provincial transaction network constraint model capable of associating a transaction network with a physical power grid aiming at the power grid security risk caused by mismatch between virtual transaction flows and actual power flows in inter-provincial power transactions, but the optimization framework focuses on physical blocking management only, ignoring key social and economic factors such as credit risk, behavior preference and the like of market subjects. The prior document [2] builds a day-before-day two-stage optimization model, compares the gain difference between the provincial conventional transaction and the green electricity transaction mode, and proposes a benefit distribution scheme based on cost and contribution, but the research mainly focuses on the body cooperation of a power supply and energy storage, and fails to fully consider the actual physical constraint of a trans-regional power transmission network. Aiming at the problem that the traditional clearing mode has defects in the aspect of coordinating the cross-region standby auxiliary service, the prior document [3] builds a tie line feasible region which simultaneously considers the electric energy and the standby auxiliary service, and builds a collaborative market clearing model. The prior document [4] proposes a unified equivalent model for protecting the data privacy of an external power grid, the model accurately describes the power transmission capacity region of a tie line through a multi-parameter planning method, and reveals the essential difference of the alternating current and direct current tie line on the power transmission characteristic. The prior document [5] researches a market coupling mechanism based on trend aiming at European partitioned power market, optimizes the selection of key network elements through a hypothetical node power price partition reconfiguration method, and effectively reduces the total cost of the system on the premise of maintaining the prior market partition. The prior document [6] proposes a regional scheduling strategy, and introduces the control performance standard parameters as constraint and measurement indexes of the scheduling process. However, the research optimization objective is concentrated on power balance, the blocking risk caused by line capacity and power flow distribution in a complex cross-regional power grid cannot be fully considered, the model is not fine enough in description of physical safety constraint of the power grid, the difference of main bodies in different areas in credit level, performance wish and the like in a market environment is ignored, and a mechanism design for hooking credit evaluation, scheduling priority and economic compensation is lacking, so that the strategy has obvious defects in the aspects of stimulating the main bodies to actively participate in cross-regional mutual economy and building an integrity and high-efficiency power market. Reference is made to: [1] wei Congying, xu Jian, wang, etc. inter-provincial trade channels that account for multiple trade couplings are available power transmission capacity optimization methods [ J ]. Grid technologies, 2024,48 (09): 3705-3712. [2] Shang Honghai, xing Tong, li Fanqi, etc. consider a new energy base source-storage collaborative delivery optimization and comprehensive benefit distribution strategy [ J ] for an inter-provincial transaction model novel power system 2024,2 (03): 312-329. [3] Liu Shuo, zhang Meng, in sontai, et al, account for the inter-grid clearing method of cross-regional backup auxiliary service [ J ]. Chinese power, 2023