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Notch filter for distributed power supply system

A notch filter and distributed power technology, applied in the field of filters, can solve problems such as instability of distributed power systems, and achieve the effect of suppressing resonance peaks, maintaining stability, and small steady-state errors

Pending Publication Date: 2018-01-19
SHENGZHOU ELECTRIC POWER +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the frequency characteristics of the inverter filter, there is a resonant peak at the resonant frequency, which leads to the instability of the distributed power system

Method used

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  • Notch filter for distributed power supply system
  • Notch filter for distributed power supply system
  • Notch filter for distributed power supply system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The invention provides a notch filter used in a distributed power supply system, the input end of the notch filter is connected with an inverter controller, the output end of the notch filter is connected with an inverter filter, the The input end of the inverter controller is connected to a grid-connected inverter, the output end of the inverter filter is connected to a grid-connected switch for turning on and off the distributed power system, and the output end of the grid-connected switch connected to a grid meter;

[0024] Wherein, the notch filter includes a resonant circuit, the resonant circuit includes a resistor R1, an inductor L1 connected in series with the resistor R1, and a capacitor C1 connected in series with the inductor L1, the resistor R1 is connected in series with the inductor L1, and the inductor L1 is connected in series with the capacitor C1.

[0025] In practice, because the inverter filter has a large attenuation effect on the high-frequency ha...

Embodiment 2

[0039] The previous embodiment proposes a notch filter based on a resonant circuit. In addition, the notch filter also includes an active single op amp notch filter or an active dual follower notch filter. This embodiment proposes an active single operational amplifier notch filter. Such as image 3 As shown, the active single op amp notch filter consists of:

[0040] An operational amplifier U1, the operational amplifier U1 has a non-inverting input terminal and an inverting input terminal, the inverting input terminal of the operational amplifier U1 is connected to its own output terminal through a resistor R6, and the output terminal of the operational amplifier U1 is connected to the The input terminal of the inverter filter, the inverting input terminal of the operational amplifier U1 is grounded through the resistor R5, the non-inverting input terminal of the operational amplifier U1 is connected to one end of the resistor R2, and one end of the resistor R2 is also conn...

Embodiment 3

[0047] This embodiment proposes an active double-following notch filter from another aspect, such as Figure 4 As shown, the active dual following notch filter consists of:

[0048] An operational amplifier U2 and an operational amplifier U3, the operational amplifier U2 and the operational amplifier U3 all have a non-inverting input terminal and an inverting input terminal, and the inverting input terminal of the operational amplifier U2 is connected to the operational amplifier U2 through a resistor R20 The output terminal of the operational amplifier U2 is connected to the output terminal of the inverter filter, the non-inverting input terminal of the operational amplifier U2 is connected to a resistor R12, the resistor R12 is connected in series with a resistor R13, and the resistor R13 is One end is connected to the output end of the operational amplifier U3 through a capacitor C15, the other end of the resistor R13 is connected to the output end of the inverter controlle...

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Abstract

The invention provides a notch filter for a distributed power supply system, and belongs to the field of filters. The input end of the notch filter is connected with an inverter controller, the outputend of the notch filter is connected with an inverter filter, the input end of the inverter controller is connected with a grid-connected inverter, the output end of the inverter filter is connectedwith a grid-connected switch which is used for conducting and closing the distributed power supply system, the output end of the grid-connected switch is connected with a power grid meter, and the notch filter comprises a resonance circuit, the resonance circuit comprises a resistor R1, an inductor L1 connected with the resistor R1 in series, a capacitor C1 connected with the inductor L1 in series, the resistor R1 is connected with the inductor L1 in series, and the inductor L1 is connected with the capacitor C1 in series. The improved notch filter is adopted, the resonance peak of the inverter filter is suppressed, the stability of the distributed power supply system is kept, the distributed power supply system has small steady-state errors and enough stability margin, and the low-frequency-band gain is improved.

Description

technical field [0001] The invention belongs to the field of filters, in particular to a notch filter used in a distributed power supply system. Background technique [0002] With the increasingly serious energy crisis and environmental pollution, the distributed power generation technology using renewable energy such as solar energy and wind energy has attracted more and more attention. As the interface device between the distributed power system and the grid, the grid-connected inverter directly affects the quality of the output power of the power generation system. In order to suppress the high-frequency harmonics generated by the power devices of the grid-connected inverter, the current mainstream Methods An inverter filter is added between the grid-connected inverter and the grid. The inverter filter has a good attenuation effect on high-frequency harmonics, so it is widely used. [0003] Due to the frequency characteristics of the inverter filter, there is a resonant ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02H9/04H02H9/02
CPCY02E40/40
Inventor 庄明建韦黔波殷超童啸霄倪利求芳芳刘丹科张宇翔凌超孙桂付
Owner SHENGZHOU ELECTRIC POWER
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