Predictive control based operation control method for PV-ESS (photovoltaic-energy storage system) microgrid

A technology of operation control and predictive control, applied in the field of photovoltaic storage microgrid, can solve the problems of increasing payback period, worsening investment income ratio, decreasing subsidy amount, etc., to achieve the effect of improving economic benefits and stabilizing photovoltaics

Active Publication Date: 2018-06-29
DALIAN UNIV OF TECH QINGDAO NEW ENERGY MATERIALS TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, my country only subsidizes grid-connected distributed photovoltaics, and the subsidy amount will continue to decline. Although the addition of energy storage to form a solar-storage micro-grid solves problems such as power reliability, the increase in costs leads to an increase in the recovery cycle and a change in the investment return ratio. Difference

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] An operation control method for photovoltaic storage microgrid based on predictive control. Based on photovoltaic and load prediction, the optimal operation control of photovoltaic storage microgrid is realized respectively under grid-connected and off-grid conditions. The specific steps are as follows:

[0028] In grid-connected mode:

[0029] (1) During the electricity price valley period (23:00 on the same day to 7:00 on the next day), the energy storage system is charged in constant voltage mode, and the power is charged to the set value (50% of the rated total power of the energy storage system);

[0030] (2) During the electricity price peak period (8:30 to 11:30 of the day, 16:00 to 21:00 of the day), when the photovoltaic power value is less than the load power value, the energy storage system discharges in constant power mode, and the discharge power value = Coefficient*(load power value-photovoltaic power value), the value range of the coefficient is 0~1, whic...

Embodiment 2

[0038] The steps of a predictive control-based optical storage microgrid operation control method described in this embodiment are the same as those in Embodiment 1, and the different technical parameters are:

[0039] 1) The charging setting value is 55% of the rated total power of the energy storage system;

[0040] 2) The minimum warning value is 32% of the total rated power of the energy storage system;

[0041] 3) The highest warning value is 87% of the total rated power of the energy storage system;

[0042] 4) The minimum power alarm value is 22% of the rated total power of the energy storage system;

[0043] 5) The maximum power alarm value is 96% of the rated total power of the energy storage system;

[0044] 6) The lower fixed value is 1.5% of the total rated power of the energy storage system.

Embodiment 3

[0046] The steps of a predictive control-based optical storage microgrid operation control method described in this embodiment are the same as those in Embodiment 1, and the different technical parameters are:

[0047] 1) The charging setting value is 60% of the rated total power of the energy storage system;

[0048] 2) The minimum warning value is 30% of the total rated power of the energy storage system;

[0049] 3) The highest warning value is 90% of the total rated power of the energy storage system;

[0050] 4) The minimum power alarm value is 20% of the rated total power of the energy storage system;

[0051] 5) The maximum power alarm value is 98% of the rated total power of the energy storage system;

[0052] 6) The lower fixed value is 2% of the total rated power of the energy storage system.

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Abstract

The invention belongs to the technical field of PV-ESS (photovoltaic-energy storage system) microgrids and particularly relates to a predictive control based operation control method for a PV-ESS microgrid. The method is based on photovoltaic and load prediction, and optimal operation control of the PV-ESS microgrid in on-grid and off-grid modes is realized. Photovoltaic and load prediction is applied to the PV-ESS microgrid, the effects of photovoltaic stabilization, peak load shifting, smooth output and the like are realized, and the economic benefit is increased by 5%-10%.

Description

technical field [0001] The invention belongs to the technical field of optical-storage micro-grids, and in particular relates to an operation control method for optical-storage micro-grids based on predictive control. Background technique [0002] Since distributed photovoltaic power generation has the advantages of flexible power supply, saving investment in power transmission and transformation, reducing line loss, resource and environmental friendliness, it can provide users with stable and reliable power supply by connecting with the large power grid, and can be off-grid when the large power grid fails. Operation ensures the continuity of power supply and high power quality. In recent years, it has developed rapidly and has become a long-term development strategy of the country. [0003] However, photovoltaic distributed power generation also has the characteristics of strong randomness and obvious intermittency, large fluctuations in output, and irregular fluctuation f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/28
CPCH02J3/383H02J3/28H02J3/003H02J3/388Y02E10/56Y02E70/30
Inventor 卞德振张晓峰张可欣辛娜谭毅
Owner DALIAN UNIV OF TECH QINGDAO NEW ENERGY MATERIALS TECH RES INST CO LTD
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