Power spring control method based on variable universe fuzzy PI self-adaptive control

A technology of self-adaptive control and electric spring, applied in the direction of AC network voltage adjustment, single-network parallel feeding arrangement, reactive power compensation, etc., can solve problems such as weak self-adaptive ability, achieve improved self-adaptive ability and good adjustment effect Effect

Active Publication Date: 2020-01-03
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of electric spring control method based on variable domain fuzzy PI self-adaptive control, solve the problem that general fuzzy control me

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  • Power spring control method based on variable universe fuzzy PI self-adaptive control
  • Power spring control method based on variable universe fuzzy PI self-adaptive control
  • Power spring control method based on variable universe fuzzy PI self-adaptive control

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Embodiment

[0050] The power spring system is designed as follows: the power spring device is composed of a single-phase voltage source type full-bridge inverter and an LC low-pass filter. The low-pass filter has an inductance value of 0.5mH and a capacitance value of 13.2μF. The voltage is 400V. The critical load resistance is 53Ω, the non-critical load resistance is 50.5Ω, and the critical load voltage reference value is 220V.

[0051] In order to verify that the adjustment performance of the electric spring when using the variable universe fuzzy PI adaptive control method of the present invention is better than the adjustment performance under the general fuzzy PI control, under the condition that all parameters of the system are consistent, the system is changed during operation. The resistance value of the non-critical load that has a great influence on the adjustment performance of the electric spring is compared with the adjustment performance of the electric spring under the two c...

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Abstract

The invention discloses a power spring control method based on variable universe fuzzy PI self-adaptive control. The method comprises steps of determining a fuzzy input variable and a fuzzy output variable, designing telescopic factors capable of adjusting the sizes of an input variable discourse domain and an output variable discourse domain, combining a quantization factor and a scaling factor with the corresponding telescopic factors to realize variable discourse domains, designing a fuzzy controller membership function and a fuzzy rule, and completing fuzzy reasoning and sharpening. The method is advantaged in that influence of change of the system working condition or parameter in the system operation process on the power spring adjustment performance is considered, the variable universe fuzzy PI self-adaptive control strategy is designed according to characteristics of a power spring, problems that when existing fuzzy control is applied to a power spring control system, the self-adaptive capacity is not high, and control precision is not high can be solved, the system stability is further enhanced, and the power spring adjusting capacity is improved.

Description

technical field [0001] The invention relates to the technical field of electric spring control, in particular to an electric spring control method based on variable universe fuzzy PI adaptive control. Background technique [0002] The proportion of grid-connected renewable energy power generation is gradually increasing, and the intermittent and unstable power generated by it will bring great disturbance to the grid. In order to solve this problem, Xu Shuyuan's research group at the University of Hong Kong proposed the concept of electric springs for the first time, and divided the loads in the circuit into critical loads and non-critical loads. Similar to the principle of mechanical springs, electric springs can stabilize the voltage of critical loads when the grid voltage fluctuates, and transfer voltage fluctuations to non-critical loads to achieve the goal of protecting critical loads. [0003] In the traditional electric spring control system, the PI parameters cannot ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/12H02J3/16
CPCH02J3/12H02J3/16Y02E40/30
Inventor 吕广强许文敏王宝华蒋海峰
Owner NANJING UNIV OF SCI & TECH
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