Control method and device of virtual synchronous generator and storage medium

Abstract

The invention discloses a control method and device of a virtual synchronous generator and a storage medium, the control mode of the virtual synchronous generator comprises an inertia droop control mode and a dead-beat control mode, and the control method of the virtual synchronous generator comprises the following steps: monitoring the operation state of a power grid side; if the power grid side is in a normal state, operating the virtual synchronous generator in an inertia droop control mode; if the power grid side is in the fault state, switching the virtual synchronous generator to run in a dead-beat control mode so as to suppress the fault current of the virtual synchronous generator until the power grid side returns to the normal state; symmetric and asymmetric power grid side faults can be compatible, equipment damage caused by too large impact current due to the power grid side faults is effectively avoided, and the stability of a power grid is effectively improved.

Description

technical field [0001] The invention relates to the technical field of inverter control, in particular to a control method, device and storage medium of a virtual synchronous generator. Background technique [0002] With the development of society, the stock of traditional fossil energy such as coal and petroleum is decreasing year by year, and fossil energy is an important core resource for human development. All countries are facing the problem of shortage of fossil energy. In addition, fossil energy will release a large amount of harmful gases and greenhouse gases during the combustion process, leading to the deterioration of the natural ecological environment. Therefore, in order to alleviate the fossil energy crisis and protect the natural ecological environment, vigorously developing and using new energy has become an inevitable choice for all countries. [0003] Common new energy sources include wind energy, photovoltaic energy and other forms. Compared with traditio...

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Problems solved by technology

[0005] However, the above methods are difficult to apply to virtual synchronous generators without current-voltage double closed-loop, slow suppression speed, low output power quality, small output inductance, complex structure, high degree of nonlinearity, unstable system or cannot reliably suppress Disadvantages such as asymmetrical faults

Moreover, due to the weak overcurrent capability of the power electronic converter, it is very easy to form a large current at the port when encountering a fault on the grid side, thereby burning related equipment

Therefore, it seriously restricts the promotion and application of new energy

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