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System interconnection inverter and system frequency fluctuation suppression method

A system frequency and system interconnection technology, applied in the field of system interconnection inverters, can solve problems such as changes in system frequency that do not exist

Pending Publication Date: 2021-10-12
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As we all know, the inverter is different from a synchronous generator with a rotating body. Since it is a static electrical device composed of semiconductor switching elements for power, it does not have a mechanism to suppress fluctuations in system frequency due to the inertial force of the rotating body. Function

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  • System interconnection inverter and system frequency fluctuation suppression method
  • System interconnection inverter and system frequency fluctuation suppression method
  • System interconnection inverter and system frequency fluctuation suppression method

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Embodiment Construction

[0073] Embodiments of the present invention will be described below with reference to the drawings.

[0074] figure 1 is a configuration diagram showing the system interconnection inverter of this embodiment including the inverter main circuit and its control circuit, and Figure 6 The same part is given the same number.

[0075] figure 1 , the system frequency f detected by the PLL circuit 20 g input to the subtraction unit 71 to calculate the reference frequency f 0 Deviation (f g - f 0 ). Then, the deviation (f g - f 0 ) and the above simulated attenuation coefficient k vd The multiplication result of is input to the addition unit 73 .

[0076] In addition, the system frequency f g with the simulated inertia coefficient k as a variable value vi Multiplication is performed, and the multiplication result is differentiated by the differentiating unit 72 and input to the adding unit 73 .

[0077] The addition unit 73 adds the above two inputs to the subtraction un...

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Abstract

The invention provides a system interconnection inverter and a system frequency fluctuation suppression method, which can suppress system frequency fluctuation accompanying sudden load change and renewable energy power supply output fluctuation in a short time. The present invention relates to a VSG converter which is connected to a power system to which a synchronous generator is connected, and which is operated in accordance with an output effective power command generated by a VSG control function, thereby suppressing fluctuations in system frequency. A system-connected inverter in which a control circuit drives an inverter main circuit in accordance with an output effective power command represented by the sum of an output effective power setting value of the inverter, a value obtained by multiplying a deviation between a system frequency and a reference frequency by an analog attenuation coefficient, and a value obtained by multiplying a differential value of the system frequency by an analog inertia coefficient, the control circuit of the inverter includes an adjustment unit that performs adjustment such that the simulated inertia coefficient after the system frequency reaches the maximum point of the frequency variation amount is smaller than the simulated inertia coefficient before the system frequency reaches the maximum point of the frequency variation amount.

Description

technical field [0001] The present invention relates to a system interconnection inverter that suppresses fluctuations in system frequency by a so-called virtual synchronous generator control (VSG: Virtual Synchronous Generator) function, and a method for suppressing fluctuations in system frequency. Background technique [0002] Inverters for converting DC power output from renewable energy sources such as photovoltaic power generation devices into AC power and supplying it to the power system generally operate in synchronization with the system frequency through PLL (Phase Locked Loop) control. As we all know, the inverter is different from a synchronous generator with a rotating body. Since it is a static electrical device composed of semiconductor switching elements for power, it does not have a mechanism to suppress fluctuations in system frequency due to the inertial force of the rotating body. Features. [0003] In particular, if the introduction of renewable energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/241H02M7/48Y02E10/56H02J3/381H02J2300/24H02J3/48H02H7/122
Inventor 尹松豪
Owner FUJI ELECTRIC CO LTD