A Parameter Design Method of Current Loop Series Corrector
A technology of parameter design and series correction, which is applied in the field of microgrid, can solve problems such as the decline of control performance of microsource or energy storage device, and the stability of microgrid power quality.
Active Publication Date: 2016-08-31
STATE GRID CORP OF CHINA +3
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Problems solved by technology
The introduction of the series correction device decouples the current loop to reduce the complexity of the control, but if the reasonable parameters of the series correction device are not selected, the control performance of the micro-source or energy storage device will often be reduced, and it will affect the power quality of the micro-grid or even is stability
Comprehensive research at home and abroad has not given a theoretical design scheme for the parameters of the current loop series calibrator. Therefore, how to establish a general current loop mathematical model that is more suitable for the parameter design of the cascade calibrator, and put forward an effective parameter theory on this basis The design scheme is the key to the present invention as a theoretical guide for engineering practice
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[0058] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0059] Using the method of the present invention to carry out parameter design on a photovoltaic micro-source system based on grid voltage directional PQ control in a certain micro-grid, including the following steps:
[0060] Step 1: Obtain the system parameters and actual engineering parameters required for parameter design,
[0061] 1) System parameters include:
[0062] DC side voltage U dc , value is 800V, LC filter parameter inductance L, value is 0.6mH, damping resistance R, value is 0.1Ω, PWM inverter switching frequency f s , the value is 6000Hz;
[0063] 2) The actual engineering parameters include:
[0064] System damping ratio ξ, value 0.707, natural angular frequency ω n , the value is 4500rad / s.
[0065] Step 2: Establish the mathematical model of the current loop in the general s domain, the specific process is:
[0066] 1...
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The invention discloses a method for parameter design of a current loop series corrector and belongs to the field of micro-grids. The method mainly comprises the steps that firstly, system parameters required for parameter design are obtained; secondly, a universal current loop mathematic model is established for micro-sources with different control strategies; thirdly, three types of suitable series corrector parameter design schemes are respectively adopted, so that proportion parameters and integral parameters are calculated; fourthly, performance indexes of a frequency domain and a time domain of a current loop control system are analyzed when the three schemes are adopted so that the most suitable design scheme can be obtained; finally, the parameters in the most suitable design scheme are applied to the actual system. The parameters obtained through the method can improve the control performance of a micro-source inverter interface control system and the problems existing in quality and stability of micro-grid electric power and caused by unreasonable parameters of the current loop series corrector are solved.
Description
technical field [0001] The invention relates to a parameter design method of a current loop series calibrator, which belongs to the field of microgrids. Background technique [0002] As an effective solution to manage a large number of geographically dispersed distributed generation (DG) in the future smart grid, microgrid has been valued by many countries. The microgrid is composed of DG, energy storage device, power electronic conversion device, load, protection and monitoring device, etc., forming a single controllable unit, and supplying electric energy and heat energy to users at the same time. In the micro-grid, except for micro-sources such as diesel generators, small hydropower and fixed-speed fans, most micro-sources and energy storage devices need to be connected to the grid through power electronic power conversion interfaces. The current common inverter interface control strategy Including droop (Droop) control, constant power (PQ) control, constant voltage cons...
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IPC IPC(8): G05B17/02
Inventor 孙健朱卫平陶顺袁晓冬
Owner STATE GRID CORP OF CHINA