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Photovoltaic cluster access-based AC/DC power flow section coordination and optimization control method

A power flow cross-section and optimal control technology, which is applied to AC networks with the same frequency from different sources, photovoltaic power generation, AC network circuits, etc., can solve the problems of AC micro-grids that are difficult to connect to high-density distributed energy, and achieve improved Effect of dynamic response characteristics

Active Publication Date: 2017-05-31
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, the proportion of new energy sources such as photovoltaics connected to the distribution network and the proportion of DC loads are increasing day by day. It is difficult for the traditional AC micro-grid to better adapt to the access of high-density distributed energy.

Method used

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  • Photovoltaic cluster access-based AC/DC power flow section coordination and optimization control method
  • Photovoltaic cluster access-based AC/DC power flow section coordination and optimization control method
  • Photovoltaic cluster access-based AC/DC power flow section coordination and optimization control method

Examples

Experimental program
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Effect test

Embodiment 1

[0152] Example 1: When the system runs to 0.6s in a steady state, the DC microgrid load suddenly increases by 280kW, and when it runs to 0.8s, the DC microgrid load suddenly decreases by 480kW. The DC bus voltage waveform and the transmission power waveform of the power flow section are as follows: Figure 6 and Figure 7 shown.

[0153] Depend on Figure 6 It can be seen that when the DC load has a step disturbance, the proposed control strategy can maintain the stability of the DC bus voltage, and make the DC bus voltage have a linear dynamic response, the dynamic adjustment time is short, and there is no oscillation.

[0154] Depend on Figure 7 It can be seen that when the load has a step disturbance, the active power transmitted by each converter changes accordingly to make up for the power difference and realize the dynamic balance of power. When the load suddenly increases in 0.6s, the active power transmitted from the AC side to the DC side increases, and the activ...

Embodiment 2

[0155] Example 2: When the system runs stably until 0.7s, the DC load suddenly increases by 500kW, and at 0.8s, MEMS issues an instruction to start voltage recovery control. Comparing the optimal control of voltage recovery in this paper with the traditional constant voltage control strategy, the DC bus voltage waveforms under the two strategies are as follows: Figure 8 As shown, the active power transmitted in the AC and DC power flow sections is as follows: Figure 9 and Figure 10 shown.

[0156] Depend on Figure 8 It can be seen that the optimal control of voltage recovery proposed in this paper can effectively improve the dynamic characteristics of voltage, so that there is no overshoot in the process of voltage recovery, and it has a shorter adjustment time. Compared with the traditional constant voltage control, it has better dynamic characteristics. Responsiveness.

[0157] Compared Figure 9 and Figure 10 It can be seen that since the power margin of the No. ...

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Abstract

The invention discloses a photovoltaic cluster access-based AC / DC power flow section coordination and optimization control method, comprising the following steps: introducing a switching function, establishing a nonlinear characteristic-based AC / DC power flow section mathematical model composed of a plurality of current converters on the basis of a nonlinear characteristic-based AC / DC power flow section mathematical model of a single current converter, a dynamic expansion method and coordinate transformation; constructing a power coordination and optimization controller to realize rational distribution of AC / DC power flow section transmission power and primary regulation on DC bus voltage; constructing a voltage recovery optimization controller to perform recovery control on the DC bus voltage, so as to realize secondary regulation on the DC bus voltage and improve dynamic response characteristics of the DC bus voltage. According to the photovoltaic cluster access-based AC / DC power flow section coordination and optimization control method disclosed by the invention, power fluctuation can be stabilized quickly, internal power balance of an AC / DC hybrid microgrid can be maintained, the respective current converters can be enabled to have optimized dynamic response characteristics while coordination control on a plurality of parallel-operated current converters is realized; not only can zero dynamic asymptotic stability be ensured, but also optimization control on the dynamic characteristics of the current converters can be realized.

Description

technical field [0001] The invention relates to a method for controlling cross-sections of cross-direct currents. In particular, it relates to a coordinated optimal control method for AC and DC power flow sections considering the access of photovoltaic clusters. Background technique [0002] With the continuous development of new energy grid-connected technologies, more and more renewable energy is connected to the grid. Intermittent energy sources such as photovoltaics and wind power will make the network flow random and uncertain after they are connected to the grid. It will increase the difficulty of system power flow control. [0003] As an effective way to make the large grid more efficient and accept new energy, the microgrid has received extensive attention. Nowadays, the proportion of new energy sources such as photovoltaics connected to the distribution network and the proportion of DC loads are increasing day by day. It is difficult for the traditional AC micro-...

Claims

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Application Information

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IPC IPC(8): H02J3/46H02J3/06H02J3/24
CPCH02J3/06H02J3/24H02J3/383H02J3/46H02J2203/20Y02E10/56
Inventor 李鹏李鑫明陈安伟汪乐天周国华
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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