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Control system for off-grid parallel connection of energy storage inverters

A technology of energy storage inverter and control system, which is applied in the direction of power network operating system integration, information technology support system, AC network circuit, etc., to achieve the effect of saving maintenance and upgrading costs in the later stage

Active Publication Date: 2022-04-15
GUANGZHOU FELICITY SOLAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Consult the relevant published technical solutions. The technical solution with the publication number CN106159935A proposes an on-grid and off-grid control scheme including master and slave energy storage inverters. By monitoring and controlling the voltages of multiple storage batteries to dynamically approach each other, reducing The influence of the common mode circulation between the energy storage inverters improves the stability of the overall system; the technical solution with the publication number CN213846251U proposes to use a switching device composed of 6 relays to connect and disconnect the energy storage inverters Control, taking into account the cost of the switching device and the performance of control efficiency; the above technical solutions are mostly solutions involving the parallel structure and circuit part of the energy storage inverter, and do not take into account the specific power load scenario

Method used

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  • Control system for off-grid parallel connection of energy storage inverters
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  • Control system for off-grid parallel connection of energy storage inverters

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Embodiment 1

[0050] as attached figure 1 , a control system for off-grid parallel connection of energy storage inverters, the control system comprising:

[0051] Power generating unit 101: for generating electric energy through an external power generating device;

[0052] Energy storage unit 102: used to store the electric energy generated by the power generation unit and provide electric energy for the load;

[0053] The power supply control unit 103 is configured to control the power generation unit to output electric energy to the load circuit bus or the energy storage electric unit, and control the energy storage unit to output electric energy to the load circuit bus:

[0054] The load monitoring unit 104 includes a monitoring subunit 140 configured to be coupled to multiple loads, and a master control unit 141 communicatively connected to the multiple monitoring subunits;

[0055] Wherein, the monitoring subunit makes the power consumption of the load less than the maximum allowabl...

Embodiment 2

[0086] This embodiment should be understood as at least including all the features of any one of the foregoing embodiments, and further improvements on the basis thereof;

[0087] When off-grid occurs, the control system includes calculating the current power supply capacity of multiple power generation units, the storage capacity of multiple energy storage units, and predicting the power consumption of multiple loads according to the time period T, so as to formulate The power consumption strategy and the power supply strategy; the time period T is optionally in units of 1 hour;

[0088] Use the following formula:

[0089] , Formula 4;

[0090] in, is a formula for calculating the available electric energy, is a plurality of the energy storage units L 1 , L 2 ...... L I of the current stored electrical energy, For a plurality of said generating units S 1 ,S 2 ... S M The predicted value of power generation can be calculated according to the power generation equip...

Embodiment 3

[0096] This embodiment should be understood as at least including all the features of any one of the foregoing embodiments, and further improvements on the basis thereof;

[0097] In some embodiments, in order to remind the user of the power usage strategy to be executed by the control system as early as possible, the control system includes a power usage strategy application program that provides a visualized power usage strategy arrangement;

[0098] The control system includes a plurality of application program interfaces. By obtaining the data information of the load monitoring unit and the power supply control unit, the data information is output to the application program through the application program interface, and the application program performs statistics and sorting ;

[0099] Further, the application program includes presenting the overall performance of the current power consumption strategy in forms, graphics, voice, etc., as shown in the attached image 3 sho...

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Abstract

The invention relates to a control system for off-grid parallel connection of energy storage inverters. The control system comprises a power supply control unit and a load monitoring unit, the power supply control unit is configured to monitor the power storage state of the energy storage unit and control the power supply output of the energy storage unit; the load monitoring unit comprises monitoring subunits coupled to a plurality of loads and a general control unit in communication connection with the monitoring subunits; working parameters of an electricity load are collected through the monitoring subunit, and an electricity utilization model based on a time sequence is established and used for predicting electricity utilization requirements of the load in the future so as to formulate an electricity utilization strategy; and further determining a power supply strategy by monitoring the power storage state of the energy storage units and combining with the power utilization strategy, thereby controlling the parallel operation of the at least two energy storage units after off-grid.

Description

technical field [0001] The invention relates to the technical field of electric energy equipment. Specifically, it relates to a control system for off-grid parallel connection of energy storage inverters. Background technique [0002] At present, society's demand for electricity is increasing rapidly, and based on environmental protection reasons, there are clear requirements for the proportion of clean energy power generation in various power generation methods. At the same time, the current renewable clean energy, such as photovoltaic power generation, hydropower generation, wind power, etc. are still restricted by natural environmental factors, and it is still impossible to quickly generate high-power power according to the actual power consumption situation, so related power generation technology solutions need to be used The energy storage inverter inverts and stores the extra electric energy, and then outputs it after secondary inverting in the later stage, realizing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/14
CPCH02J3/32H02J3/144Y04S20/222
Inventor 戴日增姚国辉赵崇超龙永林温丽诗
Owner GUANGZHOU FELICITY SOLAR TECH
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