Control method of lcl type grid-connected inverter based on capacitive voltage single sensor
A capacitor-voltage, single-sensor technology, applied in the field of control, can solve the problems of complex traditional observer methods and high cost of active damping control sensors, achieve active damping and phase control, save sensor costs, and enhance reliability.
Active Publication Date: 2018-08-28
SIEMENS ELECTRICAL DRIVES
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The purpose of the present invention is to solve the problems of high cost of active damping control sensors for LCL grid-connected inverters and the complexity of traditional observer methods. The present invention provides a control method for LCL grid-connected inverters based on a capacitor voltage single sensor
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0038] Reference attached figure 1 , The model of LCL type grid-connected inverter can be expressed as:
[0039]
[0040] Reference attached figure 2 , This embodiment is figure 1 The control structure of the LCL-type grid-connected inverter in includes reference signal generation, phase-locked loop, active damping algorithm, extended state observer and transformation algorithm. The control method of the LCL grid-connected inverter based on the capacitor voltage single sensor in this embodiment includes:
[0041] Generate a reference signal through the amplitude of a given current I AMP ,Use the phase θ of the grid voltage to generate the reference waveform of the grid current The phase value can also be set to have a certain phase difference with the grid voltage to achieve power factor control. The phase locked loop is used to extract the phase information of the grid voltage signal. The active damping algorithm uses the capacitive current proportional feedback strategy, tha...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a capacitor voltage single sensor-based LCL-type gird-connected inverter control method, relates to an inverter control method, and aims at solving the problems that an active damping control sensor of an LCL-type gird-connected inverter is high in cost and a traditional observer method is complicated. The control method comprises the following steps: (1) collecting a capacitor voltage uC in an LCL filter; (2) inputting the collected capacitor voltage uC into an extended state observer to obtain a virtual state quantity; (3) converting the obtained virtual state quantity, and obtaining a real state quantity estimation value as shown in the specification and a network voltage estimation value as shown in the specification, wherein the state quantity estimation value comprises a network current estimation value as shown in the specification and an inverter current estimation value as shown in the specification; and (4) generating a drive signal of the inverter according to the obtained network current estimation value as shown in the specification, inverter current estimation value as shown in the specification and network voltage estimation value as shown in the specification, and controlling the inverter by the drive signal. The capacitor voltage single sensor-based LCL-type gird-connected inverter control method is applied to control on the LCL-type gird-connected inverter in the occasions of renewable energy conversion and the like.
Description
Technical field [0001] The invention relates to a control method, in particular to a control method of an LCL type grid-connected inverter based on a capacitor voltage single sensor. Background technique [0002] The large-scale utilization of renewable energy represented by photovoltaic and wind power is one of the ways to solve the contradiction between energy, environment and resources and realize the sustainable development of mankind. The grid-connected inverter plays a role in converting the electrical energy generated by renewable energy into AC power that the grid can accept. In order to suppress the harmonics generated by the PWM chopping of the grid-connected inverter, a filter must be added between the inverter and the grid. Commonly used filter types for grid-connected inverters include L-type and LCL-type. The L-type filter has simple control and good stability. It is widely used in inverter products. Its disadvantage is that it needs a large inductance to achieve ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02J3/38H02J3/01
CPCH02J3/01H02J3/38H02M7/5387Y02E40/40
Inventor 王宝超徐永向邹继斌
Owner SIEMENS ELECTRICAL DRIVES