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Network source coordination virtual synchronous machine control method for integrated optical storage system

A technology of a virtual synchronous machine and a control method, applied in the fields of energy storage, microgrid control, and photovoltaics, can solve problems such as limiting the promotion of VSG strategies, and achieve the effects of reducing the variation range, ensuring system security, and extending battery life.

Active Publication Date: 2022-04-22
XI AN JIAOTONG UNIV
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Problems solved by technology

This severely limits the generalization of the VSG strategy in practical engineering

Method used

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  • Network source coordination virtual synchronous machine control method for integrated optical storage system
  • Network source coordination virtual synchronous machine control method for integrated optical storage system
  • Network source coordination virtual synchronous machine control method for integrated optical storage system

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Embodiment

[0064] From two aspects of grid-side fluctuation and source-side photovoltaic output fluctuation, the superiority of the control strategy disclosed in the present invention over the control effect of traditional VSG is compared.

[0065] Both strategies are applied to figure 1 Same topology as shown, with same hardware parameters. In the initial state, the battery output current is 0A, and the photovoltaic output power of 1kW is sent to the grid through the inverter. At 0.6s, a sudden -8° phase disturbance on the grid side caused a sudden increase in the absorbed power on the grid side; at 1.2s, the photovoltaic output power began to ramp up (simulated illumination enhancement), and the photovoltaic power rose to 10kW within 0.1s.

[0066] When the traditional VSG control strategy is adopted, the response waveform of the integrated optical storage system is as follows: Figure 5 Shown in (a); when adopting the control scheme disclosed by the present invention, the response w...

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Abstract

The invention discloses a network source coordination virtual synchronous machine control method for an integrated optical storage system. The method is based on an integrated optical storage system with a two-stage structure, in which photovoltaic and energy storage use the same inverter to connect to the grid, and photovoltaic and The energy storage batteries are respectively connected in parallel to the DC bus of the inverter through their respective DC / DC converters, and the two DC / DC converters and the inverter are controlled by a virtual synchronous machine control scheme coordinated by the network source. The inverter realizes inertia control and reactive power droop control; the DC / DC converter of the battery realizes active power droop control; when the DC capacitor voltage is not higher than the upper limit value U dcuplimit When , the photovoltaic DC / DC converter realizes the maximum power output control; when the DC capacitor voltage exceeds the upper limit value U dcuplimit , the photovoltaic DC / DC converter automatically enters the control of light abandonment. The invention can not only provide inertial and droop support for the power grid, but also automatically adjust the power output to the power grid when the source side power fluctuates, thereby reducing light curtailment and reducing the demand for energy storage battery capacity.

Description

technical field [0001] The invention belongs to the technical field of photovoltaics, energy storage and micro-grid control, and in particular relates to a method for controlling a network source coordination virtual synchronous machine of an integrated system of photovoltaics and storage. Background technique [0002] In recent years, more and more new energy sources have been integrated into the grid through converters. Initially, new energy sources are connected to the grid with the maximum power output control strategy, so they do not respond to changes in grid-side power demand, which leads to a decrease in grid inertia and poor stability. Therefore, the new energy system is gradually required to have the ability of voltage regulation and frequency regulation and inertial support capability. Therefore, many strategies for controlling new energy grid-connected inverters to provide frequency and voltage support for the grid have been proposed. Among them, VSG has attract...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/32H02J3/38H02J3/46H02J3/24H02J7/35
CPCH02J3/32H02J3/381H02J3/466H02J3/24H02J7/35H02J2300/26Y02E10/56Y02E70/30Y02A30/60
Inventor 王跃刘永慧徐何凡刘航彭阳余鹏李菀茹舒思睿
Owner XI AN JIAOTONG UNIV
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