Method for controlling frequency modulation or peak regulation mode in optical-storage combined system

A technology of a combined system and control method, which is applied in the field of control strategies of a combined photovoltaic and storage system, can solve the problems of idle and waste of inverter capacity, and achieve the effects of improving capacity utilization, reducing installed capacity and saving reconstruction costs.

Active Publication Date: 2019-11-22
HEFEI UNIV OF TECH
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Problems solved by technology

[0006] However, in the existing photovoltaic storage system, grid-connected inverters are configured according to the maximum output of new energy and energy storage batteries. Photovoltaics can only reach full power when the light intensity is strongest at noon. In addition, the capacity of the inverter has all spare, waste

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  • Method for controlling frequency modulation or peak regulation mode in optical-storage combined system
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  • Method for controlling frequency modulation or peak regulation mode in optical-storage combined system

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Embodiment

[0064] 1. According to the topological structure and model parameters of the photovoltaic power station, build a detailed model of the photovoltaic power station in MATLAB / Simulink software. For the topological structure of photovoltaic power plants, see figure 2 , the model parameters are shown in Table 1.

[0065] Table 1 Model parameters

[0066] Photovoltaic installed capacity / kW 30 Energy storage battery rated capacity / Ah 300 SOC max

95％ SOC min

5％ SOC high

85％ SOC low

15％ SOC β

50％ α 0.3 Energy storage battery rated power / kW 10 Inverter capacity / kVA 30 Inverter overload capacity 10％ Transformer capacity / kVA 50 Transformer low voltage side voltage / V 220 Transformer high voltage side voltage / V 380 Ambient temperature / ℃ 25 daylight curve Figure 5 Grid Frequency Fluctuation Curve Figure 6 Δf max / Hz

0.06 Δf min / Hz

-0.06 Grid voltage / V 380

[...

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Abstract

The invention discloses a method for controlling a frequency modulation or peak regulation mode in an optical-storage combined system, and the method comprises the steps: 1, setting a peak regulationcharging and discharging time period according to the peak-valley time period of a local load and the photovoltaic output condition; 2, setting SOC partitions of an energy storage battery; 3, detecting a power grid frequency f by the optical-storage combined system, and judging an energy storage operation mode; 4, considering the idle capacity limiting condition of an inverter; 5, setting the maximum output constraint coefficient lambda SOC of the energy storage battery; and 6, considering the maximum constraint coefficient limiting condition. The idle capacity of the photovoltaic inverter canbe fully utilized, so that the photovoltaic power station has the frequency modulation / peak regulation capacity, and the pressure of a power grid frequency modulation unit and a peak regulation unitis reduced.

Description

technical field [0001] The present invention relates to the field of control strategies for a combined optical storage system, in particular to a control strategy for a combined optical storage system that can operate in two modes of frequency regulation and peak regulation. Background technique [0002] The frequency regulation task of the traditional power grid is mainly undertaken by the thermal power unit. With the rapid growth of the proportion of new energy in the power grid, the thermal power unit gradually withdraws, the frequency regulation capacity in the system decreases rapidly, and the frequency regulation capability of the power grid decreases. Therefore, the renewable energy in the power grid is required to have frequency modulation capability to make up for the reduced capacity of frequency modulation units as thermal power units withdraw. [0003] In terms of photovoltaic participation in grid frequency regulation, the current research is mainly divided into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/24H02J3/46
CPCH02J3/24H02J3/32H02J3/46Y02E10/56Y02E70/30
Inventor 丁明施建雄潘薇韩平平孙浩然
Owner HEFEI UNIV OF TECH
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