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A micro-grid coordination control method

A technology of coordinated control and micro-grid, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of micro-grid frequency change, power quality decline, micro-grid collapse and splitting, etc., and achieve the effect of overcoming overload and improving power quality

Inactive Publication Date: 2014-03-26
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

However, this control method will have the following problems in the transition process of the microgrid from grid-connected to island conversion: (1) There will be serious uneven power sharing of downstream DG devices, which will cause the power supply to be overloaded and withdraw from the connection, and even cause a chain reaction, causing micro The power grid collapses and decommissions; (2) The frequency of the micro-grid changes greatly, resulting in a decline in power quality

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Embodiment Construction

[0017] The present invention will be further introduced below with reference to the accompanying drawings and specific embodiments.

[0018] like image 3 As shown in the virtual block diagram, the inverter controller is mainly composed of active and reactive power calculation module, low DC filter module, voltage droop control algorithm module, voltage controller module, active power droop control module, frequency integration module and SVPWM pulse modulation It is composed of modules such as modules, and the virtual box is the existing active power sharing method, in which its active power droop coefficient M P is a fixed value, the existing active power sharing method adopts the power control mode, and the specific control principle is as follows: directly control the output power of the DG device, which is the basic working mode of the DG device, and its power droop control coefficient is M P , for DG devices, M P is a constant, which does not fit Figure 4 The reason ...

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Abstract

The invention discloses a micro-grid coordination control method. Each DG apparatus is connected to a micro-grid through a corresponding electric power electronic interface. The micro-grid is connected with a main power grid through a static state switch, and a direction from the micro-grid to the main power grid is set to be an upstream direction, and a direction from the main power grid micro-grid to the micro-grid is set to be a downstream direction. Coordination control is carried out on active sharing of the micro-grid through the utilization of droop coefficients MiF after the correction of the various DG apparatuses, reciprocals of the active droop coefficients MiF after the correction of the various DG apparatuses are equal to a sum of the reciprocals of the droop coefficients in an active output control mode of each DG apparatus connected to a downstream of a corresponding DG connection point. According to the micro-grid coordination control method of the present invention, correction is carried out on traditional droop control coefficients, and an inverter controller after the correction is applied into the micro-grid. All the DG apparatuses can automatically compensate load changes and effectively overcome DG apparatus overload phenomenon, and power balanced sharing can be realized. The system frequency offset is maintained in an acceptable scope, and the electric energy quality inside the micro-grid gets raised.

Description

technical field [0001] The invention relates to a distributed power generation coordination control method in a microgrid control system. Background technique [0002] With the deepening of research on distributed power generation and corresponding distributed energy storage technology, a combination of technologies related to distributed power generation (DG-Distributed Generation, referring to low-voltage power generation devices connected near end users) has gradually formed. A special form of grid - microgrid. The basic structure of a microgrid is as follows figure 1 As shown, the microgrid is isolated from the external grid Grid by a static switch at the point of common coupling (PCC). When the static switch is closed, the microgrid enters the grid-connected operation state, and when the static switch is opened, the microgrid enters the isolated operation state. A power controller is also generally installed at the PCC to control the power exchange between the entire...

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Application Information

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IPC IPC(8): H02J3/46
Inventor 苏海滨代鹏苏丹高孟泽张璐刘江伟
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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