CN-121981434-A - Wind, light and water storage integrated foundation power electricity balance influence dynamic evaluation method

CN121981434ACN 121981434 ACN121981434 ACN 121981434ACN-121981434-A

Abstract

The invention relates to the field of power systems and automation thereof, and discloses a wind, light and water storage integrated foundation power electricity balance influence dynamic evaluation method, which comprises the steps of constructing a dynamic evaluation index system covering a plurality of time scales, wherein the time scales comprise a second level, a minute level, an hour level, a day level and Ji Jieji; the method comprises the steps of establishing a corresponding evaluation model for each time scale, adopting a variable weight distribution mechanism, dynamically determining the weight of each time scale and an index according to an evaluation scene and a system state, calculating balance capacity evaluation values of an integrated base under different time scales based on the index system and the weight, and outputting an evaluation result and an optimization suggestion. The invention has the advantages of overcoming the defects of general and weak pertinence of the traditional static evaluation conclusion and providing direct, clear and operable decision support for grading, partitioning and time-sharing scheduling of the integrated base.

Inventors

ZHAO WEIJIE
JIANG YI
HUANG JIANXIANG
ZHANG QIHAO
WANG XIAOLING
LIU KUN

Assignees

中国南方电网有限责任公司超高压输电公司昆明局

Dates

Publication Date: 20260505
Application Date: 20251222

Claims (7)

1. The method for dynamically evaluating the electric quantity balance influence of the wind, light and water storage integrated foundation is characterized by comprising the following steps of, Constructing a dynamic evaluation index system covering a plurality of time scales, wherein the time scales comprise a second level, a minute level, an hour level, a day level and Ji Jieji; dynamically determining the weight of each time scale and index according to the evaluation scene and the system state by adopting a variable weight distribution mechanism; and calculating balance capability evaluation values of the integrated base under different time scales based on the index system and the weights, and outputting evaluation results and optimization suggestions.
2. The method for dynamically evaluating the electric quantity balance influence of the wind, light and water storage integrated foundation is characterized by comprising the steps of constructing a system inertia constant and frequency change rate model under the second-level time scale: ; ; In the formula, The frequency change rate at the initial moment after the disturbance occurs; a sudden power absence occurring in the system; rated frequency for the system; Is the equivalent inertia constant of the system; And The inertia constant and rated capacity of the i-th synchronous generator are respectively, And Equivalent virtual inertia and capacity provided for the energy storage system respectively; is the system reference capacity.
3. The method for dynamically evaluating the electric quantity balance influence of the wind, solar and water storage integrated foundation is characterized by comprising the following steps of constructing an automatic power generation control and regulation performance index model under the minute-scale time scale: ; ; In the formula, T is an evaluation period; Is a zone control error; Is the actual total output of the base; The power is a planned output issued by a dispatching center, B is a frequency deviation coefficient, Is the actual frequency of the system; is the rated frequency of the system.
4. The method for dynamically evaluating the electric quantity balance influence of the wind, light and water storage integrated foundation is characterized by comprising the following steps of constructing a market deviation assessment cost model under the hour-level time scale: . In the formula, Checking the cost for the automatic deviation of the h hour; is the energy deviation of the h hour, wherein The actual power generation amount is the h hour base, And scheduling the planned power generation amount for the h hour, wherein alpha and beta are unit penalty cost coefficients of positive deviation and negative deviation respectively.
5. The method for dynamically evaluating the electric quantity balance influence of the wind, solar and water storage integrated foundation is characterized by comprising the following steps of constructing a solar electric quantity balance and energy rejection rate model under the daily time scale: ; In the formula, In order to achieve a daily energy utilization rate, Total theoretical power generation available for wind, light, water in a day; The electric quantity of the abandoned wind, light and water is discarded in one day due to insufficient regulation capability; for actually delivering the total electricity quantity on the internet within one day, 。
6. The method for dynamically evaluating the electric quantity balance influence of the wind, solar and water storage integrated foundation is characterized by comprising the steps of constructing a reservoir energy storage utilization rate and seasonal energy storage value model under the seasonal time scale: ; In the formula, Annual value yield for seasonal energy storage; The electric quantity released in the peak load period or the dead water period; Electricity selling price in peak period; for the electric quantity stored in the load low valley period or the water rich period, The electricity purchasing cost is the electricity purchasing cost in the valley period; cost for energy loss in the storage process; the method is a annual investment cost for reservoirs and seasonal energy storage facilities.
7. The wind, light and water storage integrated foundation electricity balance influence dynamic evaluation method according to claim 1, wherein the variable weight distribution mechanism comprises: And a base layer, namely determining local fixed weights by adopting a subjective and objective combination weighting method aiming at indexes in each time scale: ; In the formula, Local fixed weights for index i within time scale k; Is subjective weight; And (3) with Is an objective weight; , , Is a synthetic coefficient; and the self-adaptive layer dynamically generates importance factors of all time scales based on the evaluation targets and the real-time state of the system: ; In the formula, A dynamic importance factor for time scale k; is a subjective driving part; Is an objective driving part; Is a balance coefficient; Checking the cost for the hour level deviation; checking the cost for the deviation of the jth different time scale; and a composition layer, wherein the local fixed weight is multiplied by the importance factor to obtain the global dynamic weight of each index: ; In the formula, Is the global dynamic weight of index i.

Description

Wind, light and water storage integrated foundation power electricity balance influence dynamic evaluation method Technical Field The invention relates to the field of electric power systems and automation thereof, in particular to a dynamic evaluation method for the influence of wind, light and water storage integrated foundation electricity balance. Background With the continuous deep energy structure to clean and low-carbonization transformation, the installed capacity of renewable energy sources such as wind power, photovoltaic and the like is continuously and rapidly increased, and the permeability of the renewable energy sources in an electric power system is remarkably improved. However, wind energy and solar energy resources have significant intermittent, fluctuating and random characteristics, the output of the wind energy and solar energy resources is unevenly distributed in time, the matching degree with load demands is low, and the wind energy and solar energy resources bring serious challenges to the real-time balance and safe and stable operation of a power system. Under the background, the wind-light-water-storage integrated base is used as a multi-energy complementary clean energy development mode, and the space-time complementation and the optimal configuration of energy resources are realized by cooperatively dispatching wind energy, solar energy, water energy and an energy storage system, so that the wind-light-water-storage integrated base becomes an important means for improving the new energy absorption capacity and enhancing the system regulation flexibility. Power-to-charge balancing is a core problem in power system operation and planning, with the goal of achieving dynamic matching of power supply and load on different time scales. Traditional power balance analysis focuses on a single time scale (such as day-ahead, real-time) or a single energy type, and lacks dynamic assessment of the balance capability of the system under the cooperation of multiple time scales. Particularly in a wind-light-water-storage integrated system, the wind power, the second/minute fluctuation of the photovoltaic, the day/week adjustment capability of the hydropower and the minute/hour quick response of the energy storage form a complex balance system crossing the time scale. The existing evaluation method often fails to fully consider the time scale coupling effect, so that the system flexibility, reliability and economy are limited. At present, research has made certain progress in wind-solar complementary characteristic analysis, energy storage configuration optimization, multi-objective comprehensive evaluation and the like. For example, some scholars put forward a power balance method based on time sequence production simulation, which can simulate the running state of a system in a typical day or a typical week, and research is carried out to construct an evaluation system comprising multi-dimensional indexes such as adequacy, economy, environmental protection and the like, and a subjective and objective combination weighting method is adopted for comprehensive evaluation. However, most of these methods are based on static or single time scales, and fail to systematically characterize the dynamic response characteristics and balance mechanisms of the system on multiple time scales of seconds, minutes, hours, days, or Ji Jieji. The existing evaluation method focuses on a single time scale or static scene, and is difficult to reflect dynamic influence of complex scheduling scenes such as cross-region power transmission, unit overhaul and load fluctuation. The invention provides a dynamic evaluation model integrating multiple time scales (second level, minute level, hour level, day level and month level), which combines an actual scheduling plan with new energy output prediction to quantify real-time, short-term and medium-long-term electric power balance disturbance of an integrated base access to a transmitting and receiving end system. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a dynamic evaluation method for the influence of the balance of the electricity quantity of a wind-solar-water-storage integrated foundation. The invention aims at realizing the technical scheme that the wind, light and water storage integrated foundation power electricity balance influence dynamic evaluation method comprises the following steps of, Constructing a dynamic evaluation index system covering a plurality of time scales, wherein the time scales comprise a second level, a minute level, an hour level, a day level and Ji Jieji; dynamically determining the weight of each time scale and index according to the evaluation scene and the system state by adopting a variable weight distribution mechanism; and calculating balance capability evaluation values of the integrated base under different time scales based on the index system and the weights, and outputting evaluat