Method for improving microgrid energy storage primary frequency modulation performance

A technology of energy storage and micro-grid, applied in the direction of AC network circuit, AC network load balancing, single-grid parallel feeding arrangement, etc. Good FM performance and the effect of improving primary FM performance

Active Publication Date: 2021-02-23
XIAN THERMAL POWER RES INST CO LTD
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  • Claims
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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.

Method used

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  • Method for improving microgrid energy storage primary frequency modulation performance
  • Method for improving microgrid energy storage primary frequency modulation performance
  • Method for improving microgrid energy storage primary frequency modulation performance

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Embodiment Construction

[0033] The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings.

[0034] like figure 1 As shown, AC photovoltaic arrays and wind turbines are called distributed power points. The photovoltaic array and energy storage unit are connected to the DC busbar through the DC-DC converter; the wind turbine is connected to the DC busbar through the AC-DC converter; the DC busbar is connected to the DC busbar through the DC-AC grid-connected inverter and step-up transformer connected to the large grid. The grid-connected inverter adopts VSG control, and cooperates with the energy storage unit to make the distributed power point have inertia characteristics.

[0035] like figure 2 As shown, the VSG control rotor mechanical equation is:

[0036]

[0037] 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 co...

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Abstract

The invention discloses a method for improving microgrid energy storage primary frequency modulation performance. The method comprises the following steps of: establishing a VSG rotor mechanical equation and a reactive voltage regulation equation of an energy storage microgrid grid-connected inverter virtual synchronous machine; introducing a virtual speed regulator into a rotor mechanical controllink; acquiring an active frequency variation equation; acquiring a VSG steady-state primary frequency modulation droop equation; acquiring a dynamic virtual inertia and a virtual damping coefficient; introducing the obtained dynamic virtual inertia and virtual damping coefficient into the VSG rotor mechanical equation of the energy storage microgrid grid-connected inverter, and introducing a dynamic virtual damping coefficient into a VSG steady-state primary frequency modulation droop equation, thereby achieving the purpose of improving the primary frequency modulation performance of microgrid energy storage. The VSG control strategy is adopted in the microgrid energy storage 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 method for improving the primary frequency modulation performance of microgrid energy storage. In the method, the improved virtual synchronous machine control is applied to the primary frequency modulation control of the microgrid energy storage grid-connected inverter to improve the primary frequency modulation performance of the microgrid energy storage. To solve the problem of power oscillation in the traditional VSG primary frequency modulation process, dynamic virtual parameters are adopted, and the virtual parameters are changed in real time according to the VSG virtual angular frequency to increase power stability. 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 lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46H02J3/24H02J3/28
CPCH02J3/381H02J3/46H02J3/241H02J3/28H02J2203/20
Inventor 杨沛豪孙钢虎兀鹏越寇水潮王小辉赵守柱李志鹏孙梦瑶张立松
Owner XIAN THERMAL POWER RES INST CO LTD
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