Bidirectional grid connected inverter

A technology of inverters and inverter circuits, applied in the field of bidirectional grid-connected inverters, can solve problems such as long development cycle, high error rate, and cumbersome programming

Inactive Publication Date: 2016-01-20
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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  • Description
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  • Application Information

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Problems solved by technology

The line code programming of the traditional PID control method has the disa...

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  • Bidirectional grid connected inverter
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Embodiment Construction

[0089] The present invention is specifically described below by means of drawings and examples.

[0090] A bidirectional grid-connected inverter, such as figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 shown, including power supply U dc , with the supply U dc Parallel capacitor C and three-way inverter circuit, there are three inductance L, capacitor R, and inductor L connected in series between the inverter circuits 1 , resistance R 1 And AC power supply, capacitor R, inductor L 1 A capacitor C is connected in parallel between 1 ; The AC power supply includes U a , U b , U c .

[0091] Different from the grid-connected inverter using inductance filtering, the topology structure using LCL filter adds capacitance and inductance to the AC output side. Assuming that the voltage fluctuations at both ends of the DC bus of the grid-connected inverter are not considered, the voltage of the three-phase grid is symmetrical and stable, and the switching components...

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Abstract

The invention discloses a bidirectional grid connected inverter, including a power supply Udc, a capacitor C and three inversion circuits. The capacitor C and the three inversion circuits are connected in parallel with the power supply Udc. The inversion circuits are provided with three paths of inductors L, capacitors R, inductors L1, resistors R1 and alternating current power supplies connected in series therebtween, and a capacitor C1 is connected in parallel between each capacitor C1 and each inductor L1. The alternating current power supplies comprise Ua, Ub and Uc. According to the invention, as the traditional PID control strategy exerts obvious limitation on the control of voltage, current and power of an inverter, an advanced intelligent control theory is adopted for timely measuring and controlling a large-power and high-voltage bidirectional grid connected inverter system; and a nonlinear prediction model which is achieved by applying a RBF neural network has advantages of fast convergence rate, prevention of convergence at a local extreme point and concise network structure, thereby further improving the dynamic response characteristic of the system.

Description

technical field [0001] The invention relates to a bidirectional grid-connected inverter, which provides a high-power, high-voltage bidirectional grid-connected inverter using an adaptive PID control algorithm using a genetic algorithm to control nonlinear and variable parameters and is based on RTW technology Develop the control code; it is a three-point IPM inverter structure, which is characterized by the use of IPM intelligent power devices with lower withstand voltage to form a high-voltage inverter. Background technique [0002] The nonlinear and variable parameter characteristics of high-power, bi-directional grid-connected inverters make it difficult to achieve better control effects with traditional PID control. Under certain conditions, the artificial neural network can approach any nonlinear function with arbitrary precision and has strong self-learning, self-adaptation, and self-organization capabilities. The line code programming of the traditional PID control m...

Claims

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Application Information

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IPC IPC(8): H02M7/537H02J3/38
Inventor 张宇方陈刘舒张志伟
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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