Method for cooperating power/current mass of microgrid inverter and active power filter

A source filter and current quality technology, applied in AC network to reduce harmonic/ripple, multi-phase network eliminate/reduce asymmetry, energy industry, etc., can solve grid voltage imbalance, grid-connected current distortion, Problems such as photovoltaic system output power fluctuations, to achieve the effect of balancing contradictions and improving operating performance

Active Publication Date: 2017-06-13
HUNAN UNIV
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Problems solved by technology

However, in some special cases, the grid voltage is no longer balanced, which has caused some difficulties for the grid connection of the microgrid inverter. Due to the voltage imbalance, the output power

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  • Method for cooperating power/current mass of microgrid inverter and active power filter
  • Method for cooperating power/current mass of microgrid inverter and active power filter
  • Method for cooperating power/current mass of microgrid inverter and active power filter

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Embodiment Construction

[0024] figure 1 The main circuit diagram of the grid-connected cooperative control of the micro-grid inverter added with the active filter of the present invention, the whole system is composed of the micro-grid inverter module, the active filter module and the power grid. The micro-grid inverter module adopts a three-phase bridge circuit and an LC filter, which not only ensures the stability of the inverter circuit operation, but also has a good suppression effect on the high-order harmonics of the inverter output. The active filter module is also composed of a relatively common three-phase bridge circuit plus a filter inductor. figure 1 Middle U dc_inv is the equivalent PV output DC voltage, L 1 and C are the filter inductance and capacitance of the microgrid inverter, i a i b i c is the output current of the microgrid inverter, i sa i sb i sc is the grid current, i apfa i apfb i apfc is the compensation current of the active filter, L 2 is the output filter indu...

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Abstract

The invention discloses a method for cooperating power/current mass of a microgrid inverter and an active power filter. The method is characterized in that under the condition of unbalanced power grid voltage, the certain contradiction exists between the fluctuating of the output power of the grid connecting of the microgrid inverter and the distortion of the current of the grid connecting, and a cooperative decision-making layer will set three parameters including the weighting coefficient, active power reference value and reactive power reference value, and transmit to a software layer, so as to cooperate the power/current mass of the microgrid inverter and the active power filter; the active power filter in the software layer uses current inner loop dead-beat control of voltage outer loop PI to control the size of the compensation current for the whole system, of the active power filter; the microgrid inverter uses current inner loop PR (proportional resonant) control of an alpha-beta coordinate system to control the output current of the microgrid inverter; a hardware execution layer produces expected control action to control the stable running of the microgrid inverter and the active power filter. The method has the advantage that the contradiction between the fluctuating of the output power of the microgrid inverter and the distortion of the current under the condition of unbalanced power grid voltage is balanced, so as to improve the running property of the whole system.

Description

technical field [0001] The invention relates to new energy micro-grid inverter grid-connected power generation technology and the field of active power filter control, in particular to a power / current quality coordination method between a micro-grid inverter and an active filter. Background technique [0002] With the continuous depletion of fossil energy, the development and utilization of new energy has attracted more and more attention. As a main new energy utilization method, micro-grid inverter grid-connected power generation technology has developed rapidly. In the case of normal operation of the grid, the grid voltage is in a balanced state, and it is relatively easy to realize the efficient grid-connected operation of the micro-grid inverter. However, in some special cases, the grid voltage is no longer balanced, which has caused some difficulties for the grid connection of the microgrid inverter. Due to the voltage imbalance, the output power of the photovoltaic sys...

Claims

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Application Information

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IPC IPC(8): H02J3/26H02J3/38H02J3/01
CPCH02J3/01H02J3/26H02J3/38Y02E40/40Y02E40/50Y02P80/14
Inventor 陈燕东杨苓张兵罗安周乐明周小平伍文华谢志为
Owner HUNAN UNIV
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