Microgrid grid-connected inverter control method adopting droop dynamic coefficient
A technology of dynamic coefficients and control methods, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problem of output power distribution deviation, nonlinear output voltage drop, and uneven distribution of line impedance of microgrid grid-connected inverters. problems, to achieve the effect of increasing the accuracy of active power distribution, eliminating steady-state voltage deviation, and reducing the range of reactive power compensation
Inactive Publication Date: 2021-01-15
XIAN THERMAL POWER RES INST CO LTD
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However, in the actual operation of the microgrid grid-connected inverter, there are problems such as uneven distribution of line impedance and nonlinear output voltage drop, which will lead to distribution deviation of the output power of the microgrid grid-connected inverter and stable bus voltage. The problem of state deviation
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[0034] The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings.
[0035] like figure 1 As shown, there are i (i=1, 2, 3,...n) distributed power points and inverters in the microgrid structure, and each inverter output interface is connected to an LCL filter device to suppress high-order Harmonics, R 1,i＝1，2，3,...n Indicates the inverter-side inductor series equivalent resistance, and the line impedance Z line =R line +JX line , R line is the line resistance, X line is the line inductive reactance, in a low-voltage microgrid R line >>X line . P i＝1，2，3,...n , Q i＝1，2，3,...n Indicates the active and reactive power output by the inverter, Z load is the equivalent impedance of the load.
[0036] like figure 2 As shown, establish two distributed parallel power point Thevenin equivalent circuit diagram, where: U 1 ∠δ 1 , U 2 ∠δ 2 is the output voltage of the first and second inverters; U...
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The invention discloses a microgrid grid-connected inverter control method adopting droop dynamic coefficients. The microgrid grid-connected inverter control method comprises the following steps of (1) establishing a microgrid grid-connected inverter output active and reactive power mathematical model; simplifying the mathematical models of active power and reactive power output by the inverter; simulating droop characteristics of the synchronous generator to control the microgrid grid-connected inverter, and establishing a traditional droop control equation; droop coefficients m and n in a traditional droop control equation being improved, dynamic droop coefficients mi and ni being introduced, and power distribution deviation being reduced by automatically adjusting the droop coefficients; and replacing the traditional droop coefficients m and n with the dynamic droop coefficients mi and ni to obtain a novel dynamic droop control equation. The obtained novel dynamic droop control equation is applied to the power and voltage control links of the microgrid grid-connected inverter, the power distribution precision of the microgrid grid-connected inverter control system is improved, and the voltage regulation deviation is reduced. The reactive compensation range is reduced by automatically adjusting the droop coefficient, and voltage adjustment deviation is effectively reduced.
Description
technical field [0001] The invention relates to a control method of a micro-grid grid-connected inverter using a droop dynamic coefficient, and uses the droop reactive power dynamic coefficient to improve the reactive power-voltage droop control performance of the micro-grid grid-connected inverter. Background technique [0002] In the control system of the microgrid grid-connected inverter device, PQ droop control and constant voltage and constant frequency (V-f) control are mostly used. The traditional droop control strategy simulates the droop characteristics of the traditional synchronous generator, and independently decouples control of the output active power-frequency and reactive power-voltage of the inverter device. However, in the actual operation of the microgrid grid-connected inverter, there are problems such as uneven distribution of line impedance and nonlinear output voltage drop, which will lead to the distribution deviation of the output power of the microg...
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Login to View More IPC IPC(8): H02J3/38H02J3/48H02J3/50
CPCH02J3/381H02J3/48H02J3/50H02J2203/20
Inventor 冯仰敏薛磊杨沛豪韩毅宋子琛杨洋常洋涛薛菲
Owner XIAN THERMAL POWER RES INST CO LTD