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CN-122026294-A - Energy storage dominant community multi-source complementary directional distribution power supply system and method

CN122026294ACN 122026294 ACN122026294 ACN 122026294ACN-122026294-A

Abstract

The invention provides an energy storage dominant community multisource complementary directional distribution power supply system and method, and belongs to the technical field of micro-grid control. The system comprises a power supply source composed of a distributed photovoltaic power generation unit, an energy storage battery unit and a public power grid access unit, wherein the power supply source is connected to a direct current bus through a corresponding power converter, the energy storage battery unit is directly connected through a bidirectional DC/DC converter and is configured as a voltage reference source of the direct current bus, a monitoring unit is used for collecting real-time and historical data of an electricity load and the power supply unit, a central control unit is used for establishing and dynamically optimizing a static binding relation between the power supply source and the electricity load based on the data to generate a control instruction, and an intelligent power distribution unit contains a controllable switch matrix to receive the instruction to break and break a specific power supply path to construct a directional power supply channel. According to the energy storage dominant framework and the static binding strategy, the multi-source frequent switching is avoided, and the stability, the electric energy quality and the energy utilization efficiency of the community power supply system are remarkably improved.

Inventors

  • XU GUANGMAO

Assignees

  • 杭州和诚能源服务有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. An energy storage dominant community multi-source complementary directional distribution power supply system, comprising: the power supply comprises a distributed photovoltaic power generation unit, an energy storage battery unit and a public power grid access unit, and is used for providing multi-source electric energy input; The power system comprises a public power grid access unit, a direct current bus, a distributed photovoltaic power generation unit, an energy storage battery unit, a voltage reference source, a power supply unit and a power supply unit, wherein the public power grid access unit is connected to the direct current bus through a rectifier; The monitoring unit is used for collecting power consumption data of all power consumption loads and power supply data of all power supplies; The central control unit is used for establishing and updating a static binding relation between the power supply and the power load according to the power consumption data and the power supply data and generating a control instruction of a corresponding type; the intelligent power distribution unit is connected with a power supply through a power supply line and comprises a controllable switch matrix, wherein the controllable switch matrix is used for switching on and off a power supply path between the power supply and a power utilization load according to a control instruction so as to construct an independent power supply channel.
  2. 2. The community multi-source complementary directional distribution power supply system of claim 1, wherein the power usage data comprises historical operating data of the power usage load and real-time power usage data, and the power supply data comprises rated power supply capacity of each power supply.
  3. 3. The community multisource complementary directional distribution power supply system according to claim 1, wherein the central control unit is further used for calculating available power supply capacity of each power supply source, and the central control unit is configured to calculate current available power supply capacity of the energy storage battery unit according to current charge state and rated capacity of the energy storage battery unit, take current real-time generated power of the distributed photovoltaic power generation unit as current available power supply capacity of the distributed photovoltaic power generation unit, and take preset allowable maximum power as current available power supply capacity of the public power grid access unit.
  4. 4. A community multisource complementary directional distribution power supply method applied to the community multisource complementary directional distribution power supply system of any one of claims 1 to 3, comprising: Extracting the electricity utilization characteristics of each electricity utilization load from the historical operation data, and calculating the load inertia weight of each electricity utilization load through a multi-characteristic fusion strategy; Distributing a preferred power supply to each power utilization load based on the load inertia weight and in combination with a preset matching rule so as to establish an initial static binding relation between the power supply and the power utilization load; Based on the evaluation result, the initial static binding relation is dynamically optimized through a load clustering distribution strategy to obtain an optimized static binding relation and generate a corresponding connection control instruction so as to construct an independent power supply channel between the power supply and the power consumption load; Based on the constructed independent power supply channel, in each preset detection period, carrying out the deficiency detection on each power supply source, and generating a compensation control instruction based on a power mutual-aid strategy so as to carry out power support on the deficiency power supply; And acquiring the frequency of each power supply which is determined to be the lack power supply in a plurality of continuous detection periods, and when the frequency exceeds a preset threshold value, reconstructing the power utilization load bound by the corresponding power supply through a binding relation reconstruction strategy and generating a reconstruction control instruction so as to update the independent power supply channel.
  5. 5. The community multisource complementary directed distribution power supply method of claim 4, wherein the power capability matching assessment comprises: for each power supply, according to the rated power supply capacity, combining a preset safety redundancy amount to obtain the maximum power supply of the power supply; Calculating the total load peak value of all loads bound by the power supply based on the historical operation data of the power supply bound power loads; calculating the load rate and the power supply redundancy of the power supply according to the maximum power supply and the total load peak value; If the load rate is in a preset safety interval and the power supply redundancy exceeds a preset value, judging that the power supply capacity of the power supply source meets the standard, otherwise, judging that the power supply capacity does not meet the standard.
  6. 6. The community multisource complementary directed distribution power supply method of claim 5, wherein the load cluster distribution strategy comprises: for each power supply, carrying out cluster analysis on the power utilization characteristics of each power utilization load bound by each power supply so as to identify a load subset with the largest difference between the power utilization curve form and the power fluctuation characteristic; Calculating the ratio of the total load peak value of each power supply to the maximum power supply according to the total load peak value of each power supply; for a non-compliant power supply, unbinding the identified subset of loads from the power supply, reassigning it to the power supply with the lowest ratio, and generating a connection control command.
  7. 7. The community multisource complementary directed distribution power supply method of claim 4, wherein the absence detection comprises: Based on real-time electricity utilization data of each moment of the electricity utilization load bound by the power supply in the current detection period, predicting the electricity utilization power of each moment of each electricity utilization load in a future preset period; Superposing the predicted power consumption of all power consumption loads under the same power supply at the same moment to obtain a total power consumption curve of each power supply at each moment in a future preset period; Integrating the total power consumption curve in time to obtain the total power consumption requirement in a future preset period; the available power supply capacity of the power supply at the current moment is obtained, and the electric energy difference value is calculated by comparing the total power demand so as to judge whether the power supply is an absent power supply.
  8. 8. The community multisource complementary directed distribution power supply method of claim 7, wherein the power mutual-match strategy comprises: When the lack power exists, the rest power supplies are used as candidate power supplies; Comparing the electric energy difference between the candidate power supply and the shortage power supply to screen out surplus power supplies with sufficient electric energy; calculating the mutual-aid efficiency evaluation value based on the transmission energy loss rate and response delay of the surplus power supply; and taking the surplus power supply with the highest mutual efficiency evaluation value as a replenishing power supply, and generating a compensation control instruction by combining the electric energy difference value of the shortage power supply to carry out directional power replenishment on the shortage power supply.
  9. 9. The community multi-source complementary directional distribution power supply method according to claim 5, wherein the binding relation reconstruction strategy comprises the steps of identifying a subset of loads with obvious power utilization characteristic differences for all power utilization loads bound by a target power supply through a load cluster distribution strategy, unbinding the identified subset of loads from the power supply, distributing the identified subset of loads to the power supply with the lowest load ratio according to the load ratios of the rest power supplies, and generating a reconstruction control instruction to update the binding relation between the power supply and the power utilization loads.
  10. 10. The community multisource complementary directed distribution power supply method of claim 4, wherein the multi-feature fusion strategy comprises: Normalizing each power utilization characteristic to obtain normalized characteristic values, and calculating objective weights of each power utilization characteristic; Combining the objective weight with a preset subjective weight, and obtaining the comprehensive weight of each electricity utilization characteristic through weighted summation; And combining the normalized characteristic values with corresponding comprehensive weights, and summing all the combined results to obtain the load inertia weight of each power utilization load.

Description

Energy storage dominant community multi-source complementary directional distribution power supply system and method Technical Field The invention relates to the technical field of micro-grid control, in particular to a community multi-source complementary directional distribution power supply system and method with energy storage leading function. Background In the design of a community-level optical storage and charging integrated micro-grid, an important technical route is to establish an energy storage system as a power regulation core and a voltage stabilization foundation of the system. In such an architecture, the energy storage converter is usually set to operate in a voltage source mode, and is responsible for establishing and maintaining voltage stability of the dc bus, while the photovoltaic and the power grid are connected as a controlled power source. The prior art is directed to optimizing the operation of such systems, for example by setting the charge and discharge strategy of the stored energy via an energy management system to achieve economic optimizations. However, the existing solutions have inherent drawbacks in the technical means when achieving the above-mentioned energy storage-based system regulation and control objective. The operation of the system is highly dependent on dynamic switching and power redistribution of the real-time state of the power supply such as photovoltaic, energy storage and power grid, and the frequent switching operation is liable to cause the reduction of the power quality. More importantly, the existing method lacks deep mining and utilization of load electricity characteristics, and fails to establish a relatively fixed 'source-load' matching relationship based on load attributes, so that the core regulation capacity of energy storage is not utilized to the maximum extent. Meanwhile, the system lacks the capability of self-optimizing according to the long-term operation performance, and cannot dynamically adjust the inherent energy distribution strategy, so that the overall efficiency and the adaptability of the system are further improved. Disclosure of Invention The invention provides a community multisource complementary directional distribution power supply system and method based on energy storage leading, which are used for solving the problems of poor system stability, low energy cooperative efficiency and lack of long-acting self-adaptive optimization capability of a power supply system taking energy storage as a core due to frequent switching depending on multisource in the prior art. In order to achieve the above purpose, the embodiment of the invention provides an energy storage dominant community multi-source complementary directional distribution power supply system, which comprises a power supply source, a direct current bus, a distributed photovoltaic power generation unit, an energy storage battery unit and a public power grid access unit, wherein the power supply source comprises a distributed photovoltaic power generation unit, an energy storage battery unit and a public power grid access unit, the public power grid access unit is used for providing multi-source electric energy input, the public power grid access unit is connected to the direct current bus through a rectifier, the distributed photovoltaic power generation unit is connected to the direct current bus through a DC/DC converter, the energy storage battery unit is directly connected to the direct current bus through a bidirectional DC/DC converter and is configured as a voltage reference source of the direct current bus, the monitoring unit is used for collecting power consumption data of each power consumption load and power supply data of each power supply source, the central control unit is used for establishing static binding relation between updated power supply source and power consumption load according to the power consumption data and power supply data and generating corresponding types of control instructions, and the intelligent control unit is connected with the power supply source through a power supply line and comprises a controllable switch matrix used for constructing an independent power supply channel according to the control instructions. Optionally, the electricity consumption data includes historical operation data and real-time electricity consumption data of an electricity consumption load, and the power supply data includes rated power supply capacity of each power supply. Optionally, the central control unit is further configured to calculate available power supply capacity of each power supply source, and the central control unit is configured to calculate, for the energy storage battery unit, current available power supply capacity according to current charge state and rated capacity of the energy storage battery unit, use current real-time generated power of the distributed photovoltaic power generation unit as current available power supply capa