CN-121984054-A - Network-structured energy storage, location and volume-determining method considering voltage stability improvement of power grid at receiving end

CN121984054ACN 121984054 ACN121984054 ACN 121984054ACN-121984054-A

Abstract

The invention provides a network-structured energy storage locating and sizing method considering the improvement of the voltage stability of a power grid at a receiving end, and belongs to the technical field of network-structured energy storage planning. The method comprises the steps of constructing a full-element simulation model of a receiving end power grid, constructing an optimization model taking the total investment cost of the constructed net type energy storage as an objective function, constructing constraint conditions of the optimization model according to small disturbance voltage stability margin constraint, large disturbance voltage recovery characteristic constraint, site selection constraint and capacity constraint of the constructed net type energy storage, carrying out linearization processing on nonlinear items in the optimization model by using a support function relaxation algorithm, solving the optimization model to obtain site selection results and capacity results of the constructed net type energy storage, checking relaxation errors, verifying the site selection results and the capacity results by using the simulation model, and if the voltage stability of the receiving end power grid does not meet preset requirements, adjusting parameters of the optimization model, and re-solving. The invention can accurately quantify the lifting effect of the grid-structured energy storage on the voltage stability of the receiving-end power grid.

Inventors

FANG ZHOU
YAO WEI
ZHANG GUANYU
PAN XUEQING
WEI SHANYANG
LIU MINGYANG
LI XIAOMENG
CHEN XINGWEI
LIU FANGBING
TENG WEIJUN
ZHU QUANSHENG
Tian chunsun
ZHANG HAO
GAO ZE
ZHANG DI
LI CHENGHAO
LIU WEI
LI QIONGLIN
WANG HUA
GAO KUN

Assignees

国网河南省电力公司电力科学研究院
国网河南省电力公司
华中科技大学

Dates

Publication Date: 20260505
Application Date: 20260202

Claims (10)

1. A network-structured energy storage location and volume-determining method for considering the improvement of the voltage stability of a power grid at a receiving end is characterized by comprising the following steps: Constructing a receiving end power grid full-element simulation model; constructing an optimization model taking the minimum total investment cost of the net-structured energy storage as an objective function; Constructing constraint conditions of the optimization model according to small disturbance voltage stability margin constraint, large disturbance voltage recovery characteristic constraint, site selection constraint and capacity constraint of the network-structured energy storage; Linearizing nonlinear terms in the optimization model by using a support function relaxation algorithm; Solving the optimization model to obtain a site selection result and a capacity result of the net-structured energy storage, and checking a relaxation error; and verifying the address selection result and the capacity result by using the simulation model, and if the voltage stability of the power grid at the receiving end does not meet the preset requirement, adjusting the parameters of the optimization model, and solving again.
2. The method for locating and sizing a grid-structured energy storage for improving voltage stability of a power grid at a receiving end according to claim 1, wherein the optimization model is expressed as Wherein F is the total investment cost of the net-structured energy storage, CRF is the fund recovery coefficient, A set of candidate site selection nodes for network-structured energy storage, The rated capacity of the network-structured energy storage configured for node i, Initial investment cost per unit capacity of the grid-formed energy storage configured for node i, The unit capacity annual fixed operation and maintenance cost of the net-structured energy storage configured for the node i; indicating whether the node i is configured to form network type energy storage.
3. The method for locating and sizing a grid-structured energy storage taking account of an increase in voltage stability of a receiving grid as claimed in claim 1, wherein said small disturbance voltage stability margin constraint is expressed as , , , Wherein For the generalized short-circuit ratio of node i, Is the equivalent short-circuit supporting coefficient of the net-structured energy storage, The net-structured energy storage rated capacity configured for the node i, For maximum reactive output of the net-structured energy storage, For the power factor angle of the stored energy, Is the minimum allowable generalized short-circuit ratio.
4. The method for locating and sizing a grid-structured energy storage taking account of improvement in voltage stability of a receiving-end power grid according to claim 1, wherein the large disturbance voltage recovery characteristic constraints include a voltage recovery time constraint, a voltage recovery rate constraint and a voltage oscillation damping constraint; The voltage recovery time constraint is expressed as , , Wherein In order to be able to take the moment of the fault clearing, For the voltage recovery evaluation period, And The minimum and maximum values of the instantaneous value of the voltage of the post-disturbance node i, And The voltage recovery lower limit threshold value and the voltage recovery upper limit threshold value are respectively; the voltage recovery rate constraint is expressed as Wherein For the voltage value of node i at the time of fault clearing, To restore the voltage value at the end-of-time node i, And Respectively a minimum recovery rate and a maximum recovery rate; The voltage oscillation damping constraint is expressed as Wherein Is the damping ratio of the voltage oscillation at node i, Is the minimum allowable damping ratio.
5. The network-structured energy storage addressing and sizing method taking account of the improvement of the voltage stability of the power grid at the receiving end as claimed in claim 1, wherein the addressing constraints of the network-structured energy storage comprise electrical characteristic addressing constraints and engineering condition addressing constraints; The electrical characteristic addressing constraint is expressed as , , Wherein In order to minimize the permeability of the new energy, Is the new energy permeability of the node i, The new energy output of the node i is calculated, Is the local active load of node i, alpha is the voltage sensitivity threshold, For the voltage magnitude at node i, And The net-structured energy storage rated capacity and the active capacity configured for the node i respectively, The maximum transmission power of the power transmission channel of the node i is set; The engineering condition site selection constraint is expressed as , Wherein For the transmission line length from the energy storage station to node j, Is established as the maximum allowable transmission line length, To meet the node set of land use planning.
6. The networking energy storage addressing and sizing method taking account of the improvement of the voltage stability of the power grid at the receiving end as claimed in claim 1, wherein the capacity constraint of the networking energy storage comprises an active capacity constraint, a reactive capacity constraint, a capacity continuity constraint and a rated capacity constraint; The active capacity constraint is expressed as , Wherein And Respectively constructing a lower limit and an upper limit of the capacity of the net type energy storage for the node i, The standby coefficient for the power fluctuation of the new energy, The maximum active output of new energy is node i, Is a coefficient of inertia support and is used for the inertia support, For the rated capacity of the subsystem in which node i is located, As a factor of the economic capacity of the device, The new energy output of the node i is calculated, As the local active load of node i, The technical maximum capacity of the energy storage device; the reactive capacity constraint is expressed as , Wherein In the form of a reactive power to active capacity ratio, And The lower and upper limits of the reactive capacity of the net-structured energy storage configured for node i respectively, And The reactive capacity and the active capacity of the network-structured energy storage configured for the node i respectively; the capacity continuity constraint is expressed as , Wherein And The lower limit and the upper limit of the active capacity of the net-structured energy storage configured for the node i respectively; The rated capacity constraint is expressed as 。
7. The networking type energy storage, location and volume selection method considering the improvement of the voltage stability of a power grid at a receiving end according to claim 6, wherein the nonlinear term is the rated capacity constraint, and the result of linearization processing of the rated capacity constraint is that K=1, 2,..k, K is the discrete number of directions.
8. The networking type energy storage, location and volume-determining device for considering the improvement of the voltage stability of the power grid at the receiving end is characterized by comprising a simulation model unit, an optimization model unit, a solving unit and a verification unit; the simulation model unit is used for constructing a full-element simulation model of the receiving end power grid; The optimization model unit is used for constructing an optimization model taking the total investment cost of the net-structured energy storage as an objective function, constructing constraint conditions of the optimization model according to small disturbance voltage stability margin constraint, large disturbance voltage recovery characteristic constraint, site selection constraint and capacity constraint of the net-structured energy storage, and carrying out linearization treatment on nonlinear items in the optimization model by using a support function relaxation algorithm; The solving unit is used for solving the optimizing model, obtaining an addressing result and a capacity result of the net-structured energy storage and checking a relaxation error; And the verification unit is used for verifying the address selection result and the capacity result by using the simulation model, and if the voltage stability of the receiving end power grid does not meet the preset requirement.
9. An electronic device comprising a processor and a memory, the memory for storing executable instructions, the processor for executing the instructions to implement the method of sizing of any of claims 1-7.
10. A computer readable storage medium having instructions stored therein which, when executed, implement the method of sizing of any of claims 1-7.

Description

Network-structured energy storage, location and volume-determining method considering voltage stability improvement of power grid at receiving end Technical Field The invention belongs to the technical field of network-structured energy storage planning, and particularly relates to a network-structured energy storage addressing and sizing method, an addressing and sizing device, electronic equipment and a storage medium for considering the improvement of voltage stability of a power grid at a receiving end. Background With the wide application of high-proportion new energy grid connection and extra-high voltage direct current transmission technology, a receiving end power grid presents the characteristic of high power electronization and low inertia, the duty ratio of a synchronous generator is continuously reduced, and the voltage supporting capability is obviously weakened. In a receiving end power grid, the reactive-voltage characteristics of the extra-high voltage direct current converter and the new energy converter are obviously different from those of the traditional synchronous machine, and when the load fluctuation or the fault disturbance is encountered, the problems of voltage drop, oscillation and even instability are easily caused, so that the safe and stable operation of the power grid is seriously threatened. The net-structured energy storage is used as a novel flexible resource with independent voltage source characteristics, can simulate the operation characteristics of a synchronous generator, provides voltage support and inertia supplement, and is an effective means for improving the voltage stability of a receiving end power grid. The existing network-structured energy storage site selection and volume determination research focuses on the improvement of the short circuit ratio of a new energy station or the matching of time sequence characteristics in the day, and has the defects that firstly, the voltage stability requirements of scenes such as multi-converter feed-in, dense load and the like of a receiving-end power grid are not considered pertinently, the suitability of an optimization target and the operation characteristics of the receiving-end power grid is not enough, secondly, the quantitative evaluation of the voltage stability is limited to small disturbance scenes, the voltage recovery performance under large disturbance is ignored, and the disturbance resistance of an optimization scheme is limited. The simulation analysis can accurately describe transient response characteristics of elements such as a generator, a load, energy storage and the like in the power system, completely reflect the voltage change process of the system after disturbance, and is a reliable means for evaluating the voltage stability of the power grid. Therefore, a network-structured energy storage site selection and volume determination optimization method and device for improving voltage stability performance of a receiving end power grid by combining simulation technology are needed to be provided, and accurate configuration of energy storage resources is achieved. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a network-structured energy storage locating and sizing method, an locating and sizing device, electronic equipment and a storage medium for improving the voltage stability of a receiving-end power grid, which can accurately quantify the lifting effect of the network-structured energy storage on the voltage stability of the receiving-end power grid, realize the dual aims of voltage stability lifting and investment cost optimization, effectively enhance the disturbance rejection capability of the receiving-end power grid and are suitable for the planning of a novel power system with high-proportion power electronics. In order to solve one or a part or all of the technical problems, the invention adopts the following technical scheme: a network-structured energy storage locating and sizing method for considering the improvement of the voltage stability of a power grid at a receiving end comprises the following steps: Constructing a receiving end power grid full-element simulation model; constructing an optimization model taking the minimum total investment cost of the net-structured energy storage as an objective function; Constructing constraint conditions of the optimization model according to small disturbance voltage stability margin constraint, large disturbance voltage recovery characteristic constraint, site selection constraint and capacity constraint of the network-structured energy storage; Linearizing nonlinear terms in the optimization model by using a support function relaxation algorithm; Solving the optimization model to obtain a site selection result and a capacity result of the net-structured energy storage, and checking a relaxation error; and verifying the address selection result and the capacity result by using the simulation model, a