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Coordinated control method for multiple converters in AC/DC section in hybrid micro grid

A hybrid microgrid and coordinated control technology, applied in electrical components and other directions, can solve problems such as controller instability, and achieve the effects of improving performance, ensuring voltage quality, and improving response speed.

Active Publication Date: 2017-09-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology

Therefore, the designed controller may be unstable

Method used

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  • Coordinated control method for multiple converters in AC/DC section in hybrid micro grid
  • Coordinated control method for multiple converters in AC/DC section in hybrid micro grid
  • Coordinated control method for multiple converters in AC/DC section in hybrid micro grid

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[0079] consider as figure 1 The shown AC and DC hybrid microgrid, the microgrid is working in a normal state. The micro-source in the AC-DC hybrid micro-grid has three photovoltaic power generation units with the same capacity, each of which is connected to the DC bus in parallel through a boost chopper circuit, the DC load is equivalent to the DC resistance of the same value, and the DC micro-grid passes through three The parallel converters are connected to the 10kV traditional distribution network through the PCC point.

[0080] Specific modeling such as figure 2 As shown, PV1, PV2, and PV3 are three photovoltaic power sources in the DC region, L d1 , L d2 , L d3 、C d1 、C d2 、C d3 are the corresponding inductance and capacitance in the three Boost circuits, R d1 , R d2 , R d3 is the equivalent resistance from the Boost circuit and the boot circuit to the DC bus, R L is the equivalent resistance of the DC load. Exchange area by e s Equivalent to 10kV AC bus. T...

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Abstract

A coordinated control method for multiple converters in the AC / DC section in a hybrid micro grid comprises the following steps: a mathematical model is built according to the structure and parameters of an AC / DC micro grid, specifically, a mathematical model of boost circuits is built through an average state method according to the numerical theory under the premise of considering the switching nonlinearity of the boost circuits; in view of the characteristics of the multiple boost circuits, photovoltaic power generation and micro grid load in an AC / DC hybrid micro grid and multiple converters in the AC section, input variables influencing the micro grid control effect are separated and divided into controllable variables and disturbance variables (namely, adjustable electrical variables and unadjustable electrical variables) according to an H<infinite> design method of the weighted mixed sensitivity problem, and a state space is established; and an AC / DC hybrid micro grid DC power flow section multi-converter K<infinite> coordinated controller is designed based on the H<infinite> method of the weighted mixed sensitivity problem. The performance of the controller can be continuously improved by adjusting a weight function flexibly according to performance indicators to be designed, in order to ensure the voltage quality of a DC system.

Description

technical field [0001] The invention relates to a control method for an AC and DC section multi-converter. In particular, it relates to a coordinated control method for multiple converters with AC and DC sections in a hybrid microgrid. Background technique [0002] Today's energy and environmental issues are increasingly prominent, and the development and utilization of renewable energy has become a consensus. As a comprehensive integration technology including renewable energy and other distributed power generation technologies, micro-grid has been recognized in the industry today with increasing emphasis on energy conservation and environmental protection due to its high compatibility with renewable energy and flexible regulation of distributed power generation. General attention. The AC-DC hybrid microgrid can comprehensively utilize the complementary advantages of the AC microgrid and the DC microgrid, and has a wider range of applications. [0003] The operation cont...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00
CPCH02J5/00
Inventor 李鹏付强陈安伟李国杰
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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