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Fault protection and ride-through control system and method for virtual synchronous machine

A virtual synchronous machine and fault protection technology, applied in the direction of AC network voltage adjustment, AC network load balancing, single-network parallel feeding arrangement, etc., can solve problems such as system splitting, power system paralysis, and grid instability, and achieve improved Anti-disturbance ability, contribute to power grid recovery, and improve the effect of fault recovery performance

Active Publication Date: 2016-09-28
SOUTHEAST UNIV
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Problems solved by technology

[0003] With the continuous increase of new energy grid-connected capacity, when the grid voltage drops or fails, the system may be disconnected, resulting in grid instability, and in severe cases, the power system may be partially paralyzed

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  • Fault protection and ride-through control system and method for virtual synchronous machine
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  • Fault protection and ride-through control system and method for virtual synchronous machine

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Embodiment Construction

[0021] The technical solution of the present invention is roughly as follows: the steady-state control of the virtual synchronous machine includes the following steps: measure the three-phase voltage and current on the output side of the inverter, calculate the active power according to the instantaneous power theory, and extract the power grid when an asymmetrical voltage drop fault occurs. The positive sequence component of the voltage obtains the switching signal, and at the same time calculates the correction amount of active power and reactive power that needs to be output. If the grid voltage drops deeply (exceeding the set value), a certain support voltage is obtained by putting in a power system stabilizer (PSS) , and finally calculate and adjust through the active-frequency equation, reactive-frequency equation, torque-inertia equation, and electromagnetic transient equation to obtain the output voltage amplitude and phase angle given value, and then perform PWM modulat...

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Abstract

The invention discloses a fault protection and ride-through control system and method for a virtual synchronous machine. The fault protection and ride-through control method for the virtual synchronous machine comprises the following steps of measuring the three-phase voltage and current on the inverter output side, and calculating the active power according to an instantaneous power theory; if an asymmetric voltage drop fault occurs, extracting the voltage positive sequence component of the power grid to obtain a switching signal, and calculating the correction amount when the active power and the reactive power need to be output; if the voltage drop depth of the power grid exceeds a preset value, obtaining a supporting voltage through a power system stabilizer; and performing calculation and regulation through an active equation, a reactive equation, a torque inertia equation, and an electromagnetic torque equation to obtain the amplitude value and the phase angle setting value of the output voltage, and performing PWM modulation. According to the fault protection and ride-through control system and method, an energy storage unit is adopted for performing voltage-stabilizing control; and the direct bus voltage is stabilized while it is ensured that overcurrent does not occur, so that huge voltage fluctuation is avoided, and the performance degradation of the system is prevented.

Description

technical field [0001] The invention relates to a fault protection and ride-through control technology of a microgrid inverter, in particular to a fault protection and ride-through control method and system for a virtual synchronous machine. Background technique [0002] With the popularization of new energy, the grid-connected capacity of new energy power generation is also increasing, and the impact on large power grids is getting deeper and deeper. The adoption of good grid-connected control technology is an important measure to improve the penetration rate of new energy grid-connected. Based on the virtual synchronous generator (VSG) control technology as a relatively advanced control technology at present, the grid-connected inverter has the external characteristics of a synchronous generator and has the function of frequency regulation and voltage regulation. [0003] With the continuous increase of new energy grid-connected capacity, when the grid voltage drops or fai...

Claims

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Application Information

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IPC IPC(8): H02J3/48H02J3/50H02J3/12H02J3/28
CPCH02J3/12H02J3/28H02J3/48H02J3/50
Inventor 王建华宋杰顾彬仕季振东
Owner SOUTHEAST UNIV
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