CN-122026424-A - Multi-time space energy control system and method suitable for ocean island micro-grid cluster

CN122026424ACN 122026424 ACN122026424 ACN 122026424ACN-122026424-A

Abstract

The invention discloses a multi-time space energy control system and method suitable for ocean island micro-grid clusters, which are used for constructing a two-stage two-layer distributed game framework of an aggregator-user and a resource island-energy transportation operator, wherein the first stage aims at maximizing the profit of the aggregator and minimizing the cost of the user, optimizes the electricity, heat, cold, gas, hydrogen and fresh water demand of a load island, and the second stage aims at maximizing the profit of the resource island and the transportation operator, jointly optimizes the path, arrival time and energy supply price of a mobile energy storage ship, and circularly iterates until Nash is balanced. The system comprises a renewable energy device of a resource island, an energy hub of a load island, an aggregator, a user and a mobile energy storage ship provided with an electric/gas dual-mode storage cabin, wherein each main body interacts price and supply and demand through a communication network, so that economical, robust and low-carbon operation under privacy protection is realized. The problems of space-time mismatch of the resource island and the living island, high cost of submarine cables, and double uncertainty of renewable output and shipping are solved.

Inventors

Hu mian
YI XU
WU HUAIYU
CHEN YANG
XIONG LING
CHEN ZHIHUAN

Assignees

武汉科技大学

Dates

Publication Date: 20260512
Application Date: 20251223

Claims (10)

1. A multi-space-time energy control system suitable for ocean island micro-grid clusters, characterized by comprising: A plurality of resource islands, each of which is provided with a renewable energy power generation device and a resource island operator terminal and is used for producing and selling electric energy and natural gas; at least one load island, wherein an energy hub, an aggregator, a plurality of users and an energy transportation operator are arranged in the island; the energy hub comprises electricity/gas storage equipment, CCHP, an electric boiler, an electrolytic tank and a reverse osmosis device, and is used for multi-energy conversion and storage; The aggregator terminal is respectively communicated with the user terminal, the energy hub and the energy transportation operator terminal and is used for executing first-stage optimization; The energy transportation operator terminal dispatches a plurality of mobile energy storage ships, and the ships are provided with an electric/gas dual-mode storage cabin and navigation control unit for executing a second-stage path and energy optimization; and each main body terminal interacts the price, the demand, the supply and the ship arrival time information through a communication network to form a two-stage two-layer distributed game framework.
2. The multi-time space energy control system suitable for the ocean island micro-grid cluster according to claim 1, wherein the energy transportation operator terminal is further provided with a ship remote monitoring submodule, the submodule collects the residual electric quantity, residual air quantity, position, navigational speed and sea condition data of each mobile energy storage ship in real time through satellite communication, and feeds the data back to the energy transportation operator terminal for online correction of a second-stage path and an energy optimization result.
3. The multi-time space energy control method suitable for the ocean island micro-grid cluster is characterized by comprising the following steps of: Firstly, establishing an aggregator-user double-layer non-cooperative game model by taking the maximum profit of an aggregator and the minimum cost of a user as targets, and obtaining total electricity, gas, heat, cold, hydrogen and fresh water demand of each period of a load island through iterative solution; The second stage, taking the maximum profit of the resource island and the maximum profit of the energy transportation operator as targets, establishing a double-layer non-cooperative game model of the resource island and the operator, and adopting gradient descent and genetic algorithm to jointly optimize the navigation path, arrival time and electricity/gas supply price of the mobile energy storage ship; And feeding back the supply quantity obtained in the second stage to the first stage by taking the demand quantity obtained in the first stage as a second stage boundary, and performing loop iteration on the two stages until convergence to obtain Nash equilibrium strategies of all parties.
4. The multi-space-time energy control method for ocean island micro-grid clusters according to claim 3, wherein in the first stage, in the double-layer model, an upper layer aggregator optimizes electricity, heat, cold, gas, hydrogen, fresh water selling prices and a purchasing energy plan of a self-energy transport operator, and a lower layer user optimizes transferable, load-reducible and photovoltaic surplus electricity surfing quantity according to the prices, and oscillation is eliminated by adopting a dichotomy.
5. The multi-space-time energy control method for ocean-going island micro-grid clusters according to claim 3, wherein in the second stage, in the two-layer model, the upper resource island operators optimize the electricity/gas supply amount and price based on distance compensation and production cost, and the lower energy transportation operators use the price as input, optimize the ship path, the navigational speed and the electricity/gas selling price by using genetic algorithm, and meet the constraints of ship capacity, power and round trip time.
6. The multi-space-time energy control method suitable for the ocean island micro-grid cluster according to claim 3, wherein the two-stage iteration convergence criterion is that the total purchase energy cost of the aggregator, the total sales energy benefit of the resource island, the total transport benefit of an operator and the total energy cost change rate of users in two continuous iterations are smaller than set thresholds.
7. The multi-time space energy control method suitable for the ocean island micro-grid cluster according to claim 3 is characterized in that renewable energy uncertainty is modeled through robust optimization, photovoltaic and fan output uncertainty sets are respectively built on an aggregator, a user and a resource island side, and adjustable robust parameter control conservation is introduced.
8. The method for multi-space-time energy control applicable to ocean-going island micro-grid clusters according to claim 3, wherein the path optimization objective function of the mobile energy storage ship comprises a sailing distance cost, an underloading penalty and a waiting time cost, and the constraint conditions comprise that the load island is reciprocated, each resource island is accessed only once, and the battery power is always between the minimum sailing power and the rated capacity.
9. The multi-time space energy control method suitable for the ocean island micro-grid cluster according to claim 3 is characterized in that the start-stop and power distribution of CCHP, an electric boiler, an electrolytic tank, reverse osmosis, electricity storage and gas storage equipment in an energy hub are synchronously optimized by a polymerizer in a first stage, and the real-time balance of six energy flows of electricity, heat, cold, gas, hydrogen and fresh water is satisfied.
10. The multi-space-time energy control method suitable for ocean island micro-grid clusters according to claim 3, wherein the method adopts distributed solving, namely an aggregator, a user, a resource island and an operator solve the sub-problems independently, and only the price and the demand/supply signals are interacted.

Description

Multi-time space energy control system and method suitable for ocean island micro-grid cluster Technical Field The invention relates to a control technology of an open sea island micro-grid cluster, in particular to a multi-space-time energy management system based on an ocean island micro-grid cluster and a two-stage two-layer combined optimization method thereof. Background Ocean island micro-grid cluster construction is caused by space-time dislocation of resources and loads, part of islands are rich in wind and light resources and are sparse in population (energy islands), and the other part of islands are concentrated in population and are limited in local power generation capacity (human living islands), so that power supply-loads are naturally mismatched in space, and external energy input or inter-island transportation is needed. In order to meet the energy requirements of islands and consume the remaining renewable energy of unmanned islands (resource islands), a convenient and effective inter-island power transmission mode is urgently needed. Short-range energy transmission tools typically use pipes and cables, but the high capital costs, laborious construction and demanding maintenance make them unsuitable for inter-island transmission between ocean-island micro-grid clusters. The development of mobile energy storage vessels to enable energy transfer between clusters of ocean-going island micro-grids has been the focus of much research. Energy transport operators, for example, utilize the idle storage capacity of electric travel ferries to facilitate energy transfer between islands. However, this technique currently allows for energy transfer between islands, but omits optimization of the path of travel of the mobile energy storage vessel during transfer. In particular, islands are separated by deep sea, the submarine cable laying cost is extremely high and the maintenance is difficult, and the traditional fixed tie line scheme has poor economy, so that the mobile energy storage and shipping become the main technical route, and the energy flow takes the mixed form of power flow and battery flow. Moreover, the wind speed, sunlight and wave height of the sea are changed severely, and the renewable output and the ship navigation time have strong uncertainty due to frequent extreme weather such as typhoons, heavy fog and the like, so that the dispatching strategy is required to have robustness or rolling correction capability. The single island micro-grid has small capacity and low inertia, any instantaneous power shortage or surplus can cause frequency and voltage out-of-limit, and the mobile energy storage ship can serve as off-grid standby and bears primary frequency modulation, so that the influence on the electric energy quality is direct. Meanwhile, in the system, at least multi-party bodies such as a micro-grid operator, a renewable energy source owner, an energy storage ship company, a load aggregator, residents in an island and the like exist, all party targets (cost, income, privacy and emission) conflict with each other, and a multi-layer game or cooperative sharing mechanism is needed. There is also the prior art that reduces the operating cost by optimizing the sailing route of the mobile energy storage vessel, while meeting customer demands. If a constraint strategy optimization multi-target path planning method is provided for the conflict between the low single-target path planning efficiency and the multi-target path planning targets, and a ship route and energy management dual-target combined optimization scheme taking the emission control strategy into consideration is provided, the importance that residents in an island participate in energy scheduling as independent main bodies is ignored in the prior art, and private information of the residents can be leaked. The dual-layer energy transaction model of the comprehensive energy service provider and the user including the fuel gas fuel cell-carbon capture system is used for solving the risk of privacy disclosure of the user. But users all have small photovoltaic systems within the system and are relatively small in load, and their bargaining capacity on the market is limited. Thus, the aggregator needs to act as an intermediary, transacting between the operator and the user on behalf of the user. The above-described two-layer gaming framework is no longer applicable when the aggregator is the subject of participating in energy scheduling. And the three-layer game model and the distributed algorithm considering the energy hub, the load aggregator and the user are constructed based on a grid-connected scene, and cannot be directly applied to ocean island micro-grid clusters. Disclosure of Invention The invention aims to solve the technical problems of providing a multi-time space energy control system and method suitable for ocean island micro-grid clusters, and solving the problems of energy limitation, energy transportation delay,