Energy storage primary frequency modulation virtual synchronous machine parameter analysis method

A virtual synchronous machine and parameter analysis technology, applied in the direction of AC network load balancing, reducing/preventing power oscillation, AC network circuits, etc., can solve the problems of large power grid frequency stability, complex regional power grid structure, low damping characteristics, etc. To achieve a good effect of frequency modulation performance

Active Publication Date: 2021-02-23
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology

[0002] The capacity of the power grid continues to increase, and the structure of the regional power grid becomes complex. A micro-grid composed of distributed power points with high penetration rates such as photovoltaics and wind power will inevitably affect the frequency stability of the large power grid due to its low inertia and low damping characteristics.

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  • Energy storage primary frequency modulation virtual synchronous machine parameter analysis method
  • Energy storage primary frequency modulation virtual synchronous machine parameter analysis method
  • Energy storage primary frequency modulation virtual synchronous machine parameter analysis method

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Embodiment Construction

[0045] The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings.

[0046] Such as figure 1 As shown, the energy storage primary frequency modulation virtual synchronous machine parameter analysis method provided by the present invention includes:

[0047] The VSG control rotor mechanical equation is:

[0048]

[0049] In formula (1): J is the virtual moment of inertia; T m , T e , T d VSG mechanical torque, electromagnetic torque, damping torque; D is the damping coefficient; ω g is the actual angular frequency of the grid side; P ref is the reference value of active power; P e Actual output value of active power. In the VSG control system, the virtual moment of inertia J makes the micro-grid energy storage grid-connected inverter have inertia in the process of power and frequency adjustment, and the damping coefficient D makes the micro-grid energy storage grid-connected inverter have the a...

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Abstract

The invention discloses an energy storage primary frequency modulation virtual synchronous machine parameter analysis method, which applies dynamic virtual parameter VSG control to primary frequency modulation control of a microgrid energy storage grid-connected inverter to improve the primary frequency modulation performance of microgrid energy storage. In order to analyze related parameter values in dynamic virtual parameters, a small signal model analysis method is adopted, a small signal model of a synchronous generator is used for reference, a transfer function between VSG control outputactive power and reference active power is established, and a virtual parameter steady-state value range is obtained. A dynamic virtual parameter VSG control strategy is adopted in a microgrid energystorage primary frequency modulation control system, inertia and damping support can be provided for a power grid, and the primary frequency modulation performance is good.

Description

technical field [0001] The invention relates to a parameter analysis method of a primary frequency modulation virtual synchronous machine for energy storage. The method applies the improved virtual synchronous machine control to the primary frequency modulation control of a microgrid energy storage grid-connected inverter, and improves the control parameters of the virtual synchronous machine through small signal model analysis. method. Background technique [0002] The capacity of the power grid continues to increase, and the structure of the regional power grid becomes complex. The micro-grid composed of high-permeability distributed power points such as photovoltaics and wind power will inevitably affect the frequency stability of the large power grid due to its low inertia and low damping characteristics. As a power source that can be charged and discharged flexibly, the energy storage unit can dynamically absorb and release energy in the microgrid, and because of its fa...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24H02J3/48H02J3/28
CPCH02J3/381H02J3/241H02J3/48H02J3/28H02J2203/20
Inventor 杨沛豪孙钢虎兀鹏越寇水潮葛英来高峰郭霞孙梦瑶
Owner XIAN THERMAL POWER RES INST CO LTD
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