Method for improving droop reactive power compensation performance of microgrid
A micro-grid and voltage compensation technology, applied in reactive power compensation, circuit devices, AC network circuits, etc., can solve the problems of distribution error reactive power compensation increase and decrease range, reduce reactive power compensation range, etc., and achieve small steady-state voltage deviation , narrowing the scope of reactive power compensation, and improving the accuracy of reactive power adjustment deviation
Inactive Publication Date: 2020-11-27
XIAN THERMAL POWER RES INST CO LTD
View PDF2 Cites 7 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] The purpose of the present invention is to provide a method for improving the drooping reactive power compensation performance of the microgrid. The method establishes the mathematical expression of the microgrid power with the double power point equivalent model, and obtains the linear droop control equation of the grid-connected inverter. In the process of voltage regulation, there are problems of distribution error and excessive increase and decrease of reactive power compensation. This method increases the accuracy of voltage distribution and reduces the range of reactive power compensation by introducing voltage compensation phase and adaptive droop coefficient
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
[0036] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings.
[0037] Such as figure 1 As shown, in the microgrid Thevenin equivalent circuit diagram containing two sets of DG: U 1 ∠δ 1 , U 2 ∠δ2 are the output voltages of the first and second grid-connected inverters; U 0 ∠0 is the voltage across the load impedance; Z 1 =R 1 +JX 1 ,Z 2 =R 2 +JX 2 , is the equivalent impedance of the first and second transmission lines. Z load is the load equivalent impedance.
[0038] single DG i The output active and reactive power can be expressed as:
[0039]
[0040] In a microgrid, the transmission line impedance is resistive (R i > > X i , R i ≈Z i , X i ≈0, power angle δ i →0), that is, sinδ i ≈δ i , cosδ i ≈1, then the above formula can be simplified as:
[0041]
[0042] In the actual micro-grid system, the inverter parameters of each DG are not the same, the transmission li...
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 discloses a method for improving droop reactive power compensation performance of a microgrid. The method comprises the steps of 1) establishing inverter output active power and reactivepower mathematical models of the microgrid; 2) simplifying the inverter output active power and reactive power mathematical models in the step 1); 3) establishing an output reactive-voltage droop control equation; 4) proposing an improved voltage compensation phase according to a voltage drop equation caused by the impedance of a power transmission line in the microgrid; 5) modifying a droop coefficient in the output reactive-voltage droop control equation in the step 3) into a novel adaptive droop coefficient; and 6) introducing the improved voltage compensation phase in the step 4) and thenovel adaptive droop coefficient in the step 5) into the inverter output reactive power mathematical model in the step 2) to obtain a new control equation to replace the original microgrid droop reactive power compensation control equation so as to improve the microgrid droop reactive power compensation performance. The voltage distribution precision is improved and the reactive compensation rangeis reduced by introducing the voltage compensation phase and the adaptive droop coefficient.
Description
technical field [0001] The invention relates to a method for improving the drooping reactive power compensation performance of a micro-grid, in particular to a method of introducing an improved voltage compensation phase and an adaptive reactive power drooping coefficient into a drooping reactive power compensation control system to eliminate the voltage steady-state deviation of a micro-grid And reduce the range of reactive power compensation. Background technique [0002] With the continuous increase of grid capacity and the complexity of regional grid structure, in order to improve the support for renewable energy generation and realize the large-scale application of renewable energy, it is necessary to vigorously develop micro-grids. The microgrid runs in parallel with the public grid through the public connection point (Public Connection Point, PCC), and the voltage is controlled by the public grid. In the microgrid inverter control system, PQ droop control and constan...
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 Applications(China)
IPC IPC(8): H02J3/16H02J3/50
CPCH02J3/16H02J3/50H02J2203/20Y02E40/30
Inventor 冯仰敏杨明伟杨沛豪应超赵文超孔繁新李阳薛菲
Owner XIAN THERMAL POWER RES INST CO LTD