CN-122000962-A - Network-structured energy storage point distribution method and system for enhancing short circuit ratio and transient voltage stability

CN122000962ACN 122000962 ACN122000962 ACN 122000962ACN-122000962-A

Abstract

The invention provides a network-structured energy storage point distribution method and system for enhancing short circuit ratio and transient voltage stability, belonging to the technical field of power systems; the method comprises the steps of collecting and preprocessing power grid multidimensional data, generating a power grid partition map for guiding energy storage type configuration through calculation analysis and pattern recognition, establishing an efficiency quantization model for quantizing grid-structured energy storage and grid-following energy storage to improve efficiency of power grid stability based on the power grid partition map, constructing and solving an energy storage point distribution optimization model considering cooperative constraint according to the efficiency quantization model to obtain a plurality of alternative optimization point distribution schemes, and performing time domain simulation checksum parameter cooperative setting for covering preset typical fault scenes and normal operation scenes on all the alternative optimization point distribution schemes to obtain an energy storage point distribution planning scheme. According to the invention, under the consideration of cooperative constraint, a multi-objective optimization model is constructed, and an optimization point distribution scheme which balances cost, strength and stability is obtained.

Inventors

ZHANG FENG
ZHAO SHIQI
DING LEI
FANG BAOMIN
LIU TINGXIANG
CHEN XUE
ZHOU WANPENG
WANG ZIMING
CAO ZHIMEI

Assignees

山东大学
国网青海省电力公司经济技术研究院
国网青海省电力公司清洁能源发展研究院
国网青海省电力公司

Dates

Publication Date: 20260508
Application Date: 20260211

Claims (10)

1. A network-structured energy storage dotting method for enhancing short circuit ratio and transient voltage stability is characterized by comprising the following steps: collecting and preprocessing multi-dimensional data of a power grid, and generating a power grid partition map for guiding energy storage type configuration through calculation analysis and pattern recognition; Based on the power grid partition map, establishing an efficiency quantization model for quantizing grid-formed energy storage and grid-following energy storage to improve efficiency on power grid stability; according to the efficiency quantization model, an energy storage point distribution optimization model considering cooperative constraint is constructed and solved, and a plurality of alternative optimization point distribution schemes are obtained; And performing time domain simulation checksum parameter collaborative setting covering and presetting a typical fault scene and a normal operation scene on all the alternative optimized point distribution schemes to obtain an energy storage point distribution planning scheme.
2. The method of claim 1, wherein the grid multidimensional data comprises grid topology and impedance parameters, power output data, and a predetermined set of typical faults for time domain simulation analysis.
3. The method for enhancing short-circuit ratio and transient voltage stability of grid-structured energy storage and distribution according to claim 1, wherein the generating a grid partition map for guiding energy storage type configuration through computational analysis and pattern recognition comprises: Calculating the short circuit ratio of all nodes of the power grid to be researched, and executing short circuit ratio contribution degree analysis and sensitivity analysis based on a short circuit ratio calculation result, wherein the short circuit ratio contribution degree analysis is used for calculating the contribution proportion of each power supply to the short circuit current of a target node, and the sensitivity analysis is used for evaluating the influence of the power grid parameter change on the node short circuit ratio so as to identify key root nodes causing the insufficient power grid strength; Performing time domain simulation based on a preset typical fault set, and extracting dynamic track characteristics of voltage waveforms of all nodes before and after fault clearing; Classifying transient voltage instability phenomena of different nodes into instability modes at least comprising monotone instability, low-frequency oscillation and delay recovery based on the dynamic track characteristics by using a mode identification method; And carrying out space association and superposition analysis on the key root node and the region of the instability mode to generate a power grid partition map.
4. The method for grid formation for enhancing short-circuit ratio and transient voltage stabilization according to claim 3, wherein generating a grid partition map for guiding energy storage type configuration through computational analysis and pattern recognition, further comprises: The region where the key root node is located is spatially associated with the region where the monotonic destabilization mode occurs, and is mapped into a grid-structured energy storage forced configuration region; Mapping the area where the low-frequency oscillation type or delay recovery type instability mode occurs into a following net type energy storage priority configuration area; And mapping the region with multiple destabilization modes into a mixed configuration optimizing region needing to perform network-structured energy storage and network-connected energy storage collaborative capacity optimization.
5. The method for building a grid-like energy storage distribution method for enhancing a short-circuit ratio and transient voltage stability according to claim 1, wherein the building a performance quantization model for quantizing the grid-like energy storage and the off-grid energy storage to enhance performance of the grid stability comprises: Constructing an equivalent virtual synchronous machine model of the grid-structured energy storage, wherein the equivalent virtual synchronous machine model sets a virtual inertia time constant and a transient internal impedance parameter based on rated capacity parameterization of the grid-structured energy storage so as to equivalent the grid-structured energy storage to an equivalent synchronous power generation unit presenting voltage source type supporting characteristics at grid connection points; Defining an intensity-boosting efficiency coefficient matrix of the grid-structured energy storage based on the equivalent virtual synchronous machine model, wherein the intensity-boosting efficiency coefficient matrix is used for representing quantized boosting efficiency generated by a target grid node short-circuit ratio when the grid-structured energy storage with unit rated active power capacity is deployed at a grid node; The intensity-improving efficiency coefficient matrix is obtained by introducing a unit capacity grid-structured energy storage equivalent unit into a power grid model and carrying out sensitivity analysis on the short-circuit ratio change by combining the power grid equivalent impedance parameter.
6. The method for building a grid-like energy storage distribution for enhancing a short-circuit ratio and transient voltage stability according to claim 1, wherein the building a performance quantization model for quantizing the grid-like energy storage and the off-grid energy storage to enhance performance of the grid stability further comprises: The method comprises the steps of constructing a transient power support model of the follow-up type energy storage, and constructing an active and reactive output response model of the follow-up type energy storage during power grid disturbance or fault based on grid-connected control characteristics of the follow-up type energy storage, wherein the transient power support model is used for representing power support behaviors of the follow-up type energy storage in voltage sag, voltage recovery and oscillation damping processes; Defining a power support efficiency coefficient matrix of the grid-following energy storage based on the transient power support model, wherein the power support efficiency coefficient matrix is used for quantifying the improvement efficiency generated by the transient voltage stability index of the target grid node when the grid-following energy storage with unit rated capacity is deployed at the grid node; Wherein the transient voltage stability index at least comprises one or more of a voltage minimum improvement amount, a voltage recovery time shortening amount, a voltage oscillation amplitude attenuation amount and an oscillation damping enhancement amount; The power support efficiency coefficient matrix is obtained by introducing a unit-capacity grid-following type energy storage transient power support unit into a power grid model, comparing and analyzing power grid voltage dynamic response before and after energy storage is connected in a typical fault and disturbance scene, and calculating in a mode of combining time domain simulation with sensitivity analysis.
7. The method for enhancing a short-circuit ratio and transient voltage stabilization of a grid-structured energy storage and distribution according to claim 1, wherein the constructing and solving the energy storage and distribution optimization model considering cooperative constraint comprises: defining decision variables of an energy storage point distribution optimization model, wherein the decision variables comprise point distribution selection variables, energy storage type variables and power and energy capacity variables of each candidate site; setting cooperative constraints of the energy storage point distribution optimization model, wherein the cooperative constraints at least comprise: Defining site configuration grid-constructed energy storage in a grid-constructed energy storage forced configuration area based on partition type constraint of the grid partition map; Based on the short-circuit ratio global constraint of the efficiency quantization model, ensuring that the short-circuit ratio of all the nodes after planning is larger than a safety threshold; And the proportion constraint of the collaborative capacity proportion is used for limiting the proportion of the total rated active power of the net-structured energy storage to the total rated active power of all the energy storage devices to be greater than or equal to a preset proportion lower limit.
8. The method for enhancing a short-circuit ratio and transient voltage stabilization of a grid-structured energy storage and distribution according to claim 1, wherein the objective function of the energy storage and distribution optimization model is as follows: Minimizing the total investment cost of the target power system as a first optimization target; The method comprises the steps of taking the shortest ratio of the weakest node of the planned target power system and/or shortening the longest voltage recovery time of the target power system under the worst fault as a second optimization target; the first optimization objective and the second optimization objective together form the objective function.
9. The method for enhancing a short-circuit ratio and transient voltage stability of a grid-structured energy storage and distribution system according to claim 1, wherein the performing the collaborative setting of time-domain simulation checksum parameters covering a preset typical fault scene and a normal operation scene on all the alternative optimized and distribution schemes comprises: Respectively carrying out electromagnetic transient simulation on each alternative optimized point distribution scheme, wherein the electromagnetic transient simulation covers different places and different types of fault scenes; Screening out a point distribution scheme meeting the dynamic safety and stability requirements based on an electromagnetic transient simulation result; Configuring initial control parameters for each energy storage station in the screened point distribution scheme, wherein the initial control parameters comprise virtual inertia parameters and virtual impedance parameters for net-structured energy storage, and control parameters for a power outer ring and a current inner ring for net-structured energy storage; When initial control parameters are configured, the control parameters between adjacent or functionally complementary energy storage stations meet the collaborative matching requirement through small signal stability analysis or time domain simulation verification so as to avoid adverse dynamic interaction phenomenon between different energy storage stations.
10. A grid-built energy storage distribution system for enhancing short-circuit ratio and transient voltage stability, characterized in that the system comprises a control module, the control module comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, and the processor executes the computer program to realize the grid-built energy storage distribution method for enhancing short-circuit ratio and transient voltage stability according to any one of claims 1-9.

Description

Network-structured energy storage point distribution method and system for enhancing short circuit ratio and transient voltage stability Technical Field The invention relates to the technical field of power systems, in particular to a network-structured energy storage dotting method and system for enhancing short circuit ratio and transient voltage stability. Background With the continuous large-scale access of renewable energy sources with high proportion represented by wind power and photovoltaic, the dynamic characteristics and stable forms of modern power systems are undergoing fundamental changes. The physical moment of inertia and short-circuit capacity provided by the traditional synchronous generator are greatly weakened, so that the system strength of the power electronic power grid generally shows a decreasing trend, and the core quantization index short-circuit ratio is approaching or is lower than a safe operation threshold in multiple areas. Meanwhile, the problem of transient voltage stability of the power grid after being disturbed is increasingly remarkable, and the power grid becomes one of main bottlenecks for restricting new energy consumption and safe operation of the system. Under the background, a network construction technical route with the capability of autonomously constructing the voltage and the frequency of the power grid is regarded as a key enabling technology for fundamentally reshaping the stable foundation of the power grid and replacing the function of a synchronous machine. The energy storage system applying the grid-built control strategy is widely focused as a dual value of flexible resources and active supporting units. Related researches focus on single equipment modeling, controller design, fault ride-through capability and improvement effects of the single equipment modeling, controller design and fault ride-through capability on frequency and voltage dynamic response characteristics of a local power grid, initially verify the technical feasibility of the single equipment modeling, controller design, fault ride-through capability on aspects of improving short-circuit capacity of specific nodes, inhibiting voltage fluctuation and the like, and lay a theoretical foundation for equipment-level application to system-level integration. However, despite the continued maturity of the body technology of grid-built energy storage, there are significant limitations on the systematic planning and application methods on the grid scale. Existing research and practice have focused on "point-to-point" remedial configuration of known weak nodes, or just regarding them as a generalized power source providing inertia and short-circuit capacity in a planning model, and lack a top-level planning framework from the point of view of physical root identification and global collaborative decision of grid stability problems. Disclosure of Invention The invention aims to provide a grid-structured energy storage point distribution method and system for enhancing short circuit ratio and transient voltage stability, which are used for solving the problem of cooperative lifting of short circuit ratio deficiency and transient voltage instability in an electric power system systematically by diagnosing bottleneck sources of power grid stability and cooperatively optimizing and configuring grid-structured and grid-following energy storage according to the bottleneck sources. The invention provides a grid-structured energy storage distribution method for enhancing short circuit ratio and transient voltage stability, which comprises the steps of collecting and preprocessing multi-dimensional data of a power grid, generating a power grid partition map for guiding energy storage type configuration through calculation analysis and pattern recognition, establishing an efficiency quantization model for quantizing grid-structured energy storage and grid-following energy storage to improve efficiency of the power grid stability based on the power grid partition map, constructing and solving an energy storage distribution optimization model considering cooperative constraint according to the efficiency quantization model to obtain a plurality of alternative optimization distribution schemes, and performing time domain simulation checksum parameter cooperative setting for covering preset typical fault scenes and normal operation scenes on all the alternative optimization distribution schemes to obtain an energy storage distribution planning scheme. Optionally, the grid multidimensional data includes grid topology and impedance parameters, power supply output data, and a preset typical fault set for time domain simulation analysis. The method comprises the steps of calculating short-circuit ratio of all nodes of a power grid to be researched, executing short-circuit ratio contribution analysis and sensitivity analysis based on a short-circuit ratio calculation result, wherein the short-circuit ratio contributi