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A method for generating synchronous fixed-frequency current phasors in a full-inverter microgrid

A current phasor and inverter-type technology, which is applied in the field of microgrid operation control, can solve problems such as operation control and single voltage control

Active Publication Date: 2020-10-30
SHANDONG UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the deficiencies of the prior art, the present invention proposes a method for generating a synchronous fixed-frequency current phasor in a full-inverter microgrid, which can make the control process of the microgrid system voltage similar to that of a single inverter system, by The operation control of this microgrid is transformed into a single voltage control, the control method is simple and direct, and the control accuracy is higher, completely getting rid of the frequency and voltage stability problems of the traditional AC grid in principle

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  • A method for generating synchronous fixed-frequency current phasors in a full-inverter microgrid
  • A method for generating synchronous fixed-frequency current phasors in a full-inverter microgrid
  • A method for generating synchronous fixed-frequency current phasors in a full-inverter microgrid

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Embodiment 1

[0049] figure 1 It is a flow chart of a method for generating a synchronous constant-frequency current phasor in a full-inverter microgrid according to an exemplary embodiment. like figure 1 As shown, the embodiment of the present invention provides a method for generating synchronous fixed-frequency current phasors in a full-inverter microgrid. It first uses the GPS satellite timing signal as a global synchronous reference signal to control all dispatchable current phasors in the microgrid. The distributed power inverter outputs a synchronous current phasor with a fixed frequency and consistent phase; then the current amplitude command generated according to the microgrid distributed power current-voltage droop control strategy is combined with the phase command generated according to the global synchronous reference signal to obtain The complete current phasor reference command adjusts the amplitude of the output current phasor of the schedulable inverter, so that the grid ...

Embodiment 2

[0054] figure 2 It is a flow chart of another method for generating a synchronous constant-frequency current phasor in a full-inverter microgrid according to an exemplary embodiment. like figure 2 As shown, a method for generating a synchronous fixed-frequency current phasor in a full-inverter microgrid provided by an embodiment of the present invention includes the following process:

[0055] The process of judging the operating status of GPS satellites: the local GPS operating status signal is input to the DSP controller in the local control unit of the dispatchable distributed power inverter - the general input / output interface GPIO, which is cyclically read in the main program of the DSP controller GPIO state, to judge whether the local GPS signal is out of sync, if the GPS normally sets the flag variable FLAG1=1, and executes the generation process of the global synchronous fixed-frequency current phasor based on the GPS satellite timing signal; otherwise make FLAG1=0,...

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Abstract

The invention discloses a generation method of synchronous fixed-frequency current phasors in a full-inverter type microgrid. A GPS satellite timing signal is used as a global synchronous reference signal so as to control the synchronous current phasors, which are constant in output frequency and coincident in phase, of all schedulable distributed power inverters in the microgrid; according to a microgrid distributed power current-voltage droop control strategy, a current amplitude instruction is generated, a complete current phasor reference instruction is obtained with the combination of a phase instruction generated according to the global synchronous reference signal, and the amplitudes of the output current phasors of the schedulable inverters are adjusted, so that the network voltageoperates within a qualified range, and a synchronous fixed-frequency current source microgrid is formed. In the generation method, the advantages that the amplitude, the frequency and the phase of the output voltage (current) of the inverters are flexibly controllable are given full play to, and the control over the operation of the microgrid is simplified into a single voltage control, so that the operation control difficulty of the full-inverter type microgrid is obviously reduced.

Description

technical field [0001] The invention relates to the technical field of operation control of a micro-grid, in particular to a method for generating a synchronous fixed-frequency current phasor in a full-inverter micro-grid. Background technique [0002] Microgrid is an effective way to efficiently utilize distributed renewable energy, and the combination of microgrid and large power grid is the development direction of the future power system. The microgrid is an important means to realize the local utilization of distributed renewable energy. The grid-connected microgrid operates in an island mode when the large power grid fails, which can ensure reliable power supply for users. Distributed power sources in microgrids are generally connected through inverters, among which intermittent output power sources such as photovoltaic power generation and wind power generation account for a high proportion. Limited by investment restrictions and operation and maintenance costs, they ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/40H02J3/38
CPCH02J3/381H02J3/40
Inventor 赵艳雷徐丙垠彭克刘韩奇徐化博穆森
Owner SHANDONG UNIV OF TECH
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