Photovoltaic virtual synchronous machine stability control method of self-adaptive inertia coefficient

A technology of virtual synchronous machine and inertia coefficient, which is applied in the direction of single-network parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve the problems of system stability margin reduction, power oscillation, system output power pulsation, etc., and improve power generation performance , the effect of frequency and voltage stabilization

Pending Publication Date: 2020-04-10
SHENYANG POLYTECHNIC UNIV
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Problems solved by technology

The additional control on the DC side reduces the system stability margin, causing system output power fluctuations, and may even cause serious power oscillations

Method used

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  • Photovoltaic virtual synchronous machine stability control method of self-adaptive inertia coefficient
  • Photovoltaic virtual synchronous machine stability control method of self-adaptive inertia coefficient
  • Photovoltaic virtual synchronous machine stability control method of self-adaptive inertia coefficient

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Embodiment Construction

[0071] The present invention adds an adaptive control structure to the improvement of the virtual rotor, and can automatically change the inertia coefficient according to the running state-replacing the inertia coefficient with bang-bang control to solve the problem. The photovoltaic virtual synchronous machine stability control method with adaptive inertia coefficient can ensure the stable operation of the system, and can also reduce the output power pulsation phenomenon.

[0072] A photovoltaic virtual synchronous machine stability control system with adaptive inertia coefficient,

[0073] The system includes a photovoltaic power generation system, an energy storage device, an inverter device and an adaptive inertial coefficient virtual synchronous machine device with additional control at the DC end;

[0074] The power output end of the photovoltaic power generation system is connected to the (small capacity) energy storage device, and the energy storage device is connected...

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Abstract

The invention discloses a photovoltaic virtual synchronous machine stability control method of an adaptive inertia coefficient. A system comprises a photovoltaic power generation system, an energy storage device, an inversion device and an adaptive inertia coefficient virtual synchronous machine device with DC end additional control. A closed-loop pole returns to the left side of a virtual axis, stable operation of a system is guaranteed, and meanwhile the output power pulsation phenomenon can be reduced.

Description

technical field [0001] The invention relates to the field of new energy and the technical field of distributed power generation, and mainly relates to the detection of photovoltaic dynamic characteristics and the design of a photovoltaic virtual synchronous machine. Background technique [0002] As a control method for grid-connected inverters that simulates the external characteristics of synchronous generators, the virtual synchronous machine provides a new development direction for the grid-connected problem of distributed power sources. It is difficult to stabilize the virtual synchronous machine system with photovoltaic power as the DC terminal. To solve the problem of operation, a PV virtual synchronous machine control strategy with additional DC-side control is proposed. When the PV enters the unstable working area, it automatically introduces a DC-side voltage closed-loop control for the VSG, avoiding the inverter’s work caused by the sudden drop of the DC voltage. f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24
Inventor 丁惜瀛孟令卓超蓝天翔姚润宇李闯翟晓寒岳琦毕明涛程锟韩妍宫晶赢李晓东
Owner SHENYANG POLYTECHNIC UNIV
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