Reactive power closed-loop control method and device for single-phase grid-connected inverter
A power closed-loop, control method technology, applied in reactive power adjustment/elimination/compensation, reactive power compensation, single-network parallel feeding arrangement, etc., can solve the problem of large reactive power control deviation, etc. The effect of reducing bias
Inactive Publication Date: 2020-01-31
KEHUA DATA CO LTD +1
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[0004] In view of this, an embodiment of the present invention provides a reactive power closed-loop control method and device of a single-phase grid-connected inverter to solve the problem of relatively large reactive power control deviation of single-phase grid-connected inverters in the prior art. question
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Embodiment 1
[0035] figure 1 It shows the flow chart of the implementation of the reactive power closed-loop control method of the single-phase grid-connected inverter provided by an embodiment of the present invention. For the convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows :
[0036] S101: According to the bus voltage sampling value U of the single-phase grid-connected inverter dc And bus voltage given value U dcref , to calculate the given value of active current I dref ;
[0037] S102: According to the grid-connected current sampling value I of the single-phase grid-connected inverter L , to calculate the reactive power feedback value Q of the single-phase grid-connected inverter f ;
[0038] S103: According to the reactive power given value Q of the single-phase grid-connected inverter set and the reactive power feedback value Q f , to calculate the reactive current given value I qref ;
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The invention is applicable to the technical field of a grid-connected inverter and provides a reactive power closed-loop control method and device for a single-phase grid-connected inverter. The method comprises steps of calculating a reactive current given value according to a reactive power given value and a reactive power feedback value of the single-phase grid-connected inverter; then calculating a grid-connected current given value according to the reactive current given value and the active current given value which are obtained through calculation, and finally generating a PWM controlsignal according to the grid-connected current given value. The method is advantaged in that closed-loop control of the reactive power can be realized, the relationship between the reactive power given value and the actual value is established, so deviation between the reactive power actual value and a theoretical value is reduced, and reactive power control precision of the grid-connected inverter is improved.
Description
technical field [0001] The invention belongs to the technical field of grid-connected inverters, and in particular relates to a reactive power closed-loop control method and device of a single-phase grid-connected inverter. Background technique [0002] For low-power household photovoltaic energy storage single-phase grid-connected inverter systems, when off-grid, high voltage control accuracy and small voltage fluctuation are required; Work power puts forward accuracy requirements. [0003] For the single-phase photovoltaic energy storage inverter system, the reactive power of the existing single-phase grid-connected inverter is controlled in an open-loop manner, and the reactive current is indirectly calculated by the given reactive power or power factor PF, and then the The calculated reactive current is added to the control loop, but the reactive power controlled in this way will have a large deviation from the theoretical value. Contents of the invention [0004] In...
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IPC IPC(8): H02J3/18H02J3/38
CPCH02J3/18H02J3/38Y02E40/30
Inventor 刘富广许林毅张惠珍谢程洲曾立钊
Owner KEHUA DATA CO LTD