Parallel control method for inverters with double droop control with elastic active power distribution
A technology of active power and control method, which is applied in the field of inverter parallel control of double droop control, can solve the problems of active power fluctuation of a parallel inverter system of renewable energy and other problems, and achieve the effect of ensuring stable operation.
Active Publication Date: 2018-04-24
黑龙江省工研院资产经营管理有限公司
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[0008] The purpose of the present invention is to solve the problem that the renewable energy parallel inverter system is affected by active power fluctuations. The present invention provides a parallel control method for inverters with double droop control of elastic active power distribution
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[0028] In this implementation mode, a photovoltaic inverter is taken as an example. figure 2 It is the P-ω droop curve and the output characteristic curve of renewable energy. The two inverters use the same droop curve to supply power to the load in parallel, and the output active power is P a . If the maximum output power of inverter 1 decreases at a certain moment, and P max a , see point b 1, in other words, the active power delivered by the renewable energy source 1 to the DC bus through the Boost circuit is less than the active power obtained by the load from the inverter 1 . Therefore, the DC bus capacitor will continue to discharge, and the DC bus voltage will drop until the active power output by inverter 1 drops to P=P b =P max, , at this time the power output active power of inverter 2 is P b’ . And this process is realized by shifting the drooping curve of the inverter 1 . During this process, the active power sum provided by the two inverters remains uncha...
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An inverter parallel control method for double-droop control with elastic active power allocation relates to an inverter control method, which is used for solving the problem that a renewable energy parallel inversion system is affected by the fluctuation of active power. The method comprises the following steps of controlling a parallel inverter according to Omega and V of a double-droop control equation with elastic active power allocation, wherein the double-droop control equation is shown in the specification, Omega is an angular frequency reference value of inverter output voltage, Omega<0i> is annular frequency of inverter rated output voltage, k<pi> and k<qi> are respectively droop coefficients of active power and reactive power output from an inverter, P is active power output from the inverter, P<0i> is rated output active power of the inverter, k<f> is a translation coefficient of translation quantity Delta Omega of a droop curve, V<DCi> is voltage of a DC bus, V<DCref> is reference voltage of the DC voltage, V output voltage amplitude reference value of the inverter, V<0i> is rated output voltage amplitude of the inverter, Q is reactive power output from the inverter, and Q<0i> is rated output reactive power of the inverter.
Description
technical field [0001] The invention relates to an inverter control method, in particular to an inverter parallel control method with double droop control of elastic active power distribution. Background technique [0002] Traditional droop control ignores the resistive component in the line impedance, and considers the transmission line to be mainly inductive. When the inverters are connected in parallel, the output active power is adjusted by the inverter frequency, and the output reactive power is adjusted by the inverter output voltage amplitude. Therefore, the droop equation for the parallel connection of inverters can be obtained: [0003] ω i = ω 0i -k pi (P i -P 0i ) (1) [0004] V i =V 0i -k qi (Q i -Q 0i ) (2) [0005] In the formula, i is the number of the inverter, ω i is the reference value of inverter output voltage angular frequency, ω 0i is the rated output voltage angular frequency of the inverter, k pi is the droop coefficient of the output ...
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IPC IPC(8): H02J3/38
CPCH02J3/383Y02E10/56
Inventor 王卫刘鸿鹏刘桂花李鹏飞于乐乐孙柏楠徐殿国
Owner 黑龙江省工研院资产经营管理有限公司