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Multi-domain new energy interconnection electric power system and design method thereof

A power system and new energy technology, which is applied in the multi-domain new energy interconnected power system and its design field, can solve the problem of difficult to achieve control objectives, and the control performance of PID controllers is difficult to meet the tracking speed and suppress disturbance system operating parameter changes at the same time. question

Active Publication Date: 2016-09-07
STATE GRID SHANDONG ELECTRIC POWER COMPANY RIZHAOPOWER SUPPLY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The traditional LFC control is usually suitable for a fixed operating point. As the power system structure becomes more and more complex, the traditional power generation system merges with the new power generation system, and a large number of nonlinear and uncertain links are added, so that the traditional PID controller can control In terms of performance, it is difficult to meet the tracking speed and suppress disturbance or system operating parameter changes at the same time, and it is difficult to achieve the control goal

Method used

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  • Multi-domain new energy interconnection electric power system and design method thereof
  • Multi-domain new energy interconnection electric power system and design method thereof
  • Multi-domain new energy interconnection electric power system and design method thereof

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Embodiment 1

[0156] In this embodiment, the parameter uncertain items and load disturbances in the system meet the matching conditions, and the simulation results show various simulation results of the control without the sliding mode controller and the control with the sliding mode controller (SMC). in, Figure 4 is the Δf of the control without sliding mode controller when the uncertain items are matched i (t) response, Figure 5 is the ΔP of the control without the sliding mode controller tiei (t) response, Figure 6 is the ΔP of the control without the sliding mode controller GWi (t) response, Figure 7 is the Δf controlled by the sliding mode controller i (t) response, Figure 8 is the ΔP controlled by the sliding mode controller tiei (t) response, Figure 9 is the ΔP controlled by the sliding mode controller GWi (t) Response.

Embodiment 2

[0158] In this embodiment, the parameter uncertain items and load disturbances in the system do not meet the matching conditions, and the simulation results show various simulation results when PID control and SMC control are adopted. in, Figure 10 , 11 , 12 are the Δf of PID control and constructed SMC control in the first, second and third areas respectively i (t) response, Figure 13 , 14 , 15 are respectively the ΔP of the first, second, and third regions adopting PID control and constructed SMC control tiei (t) response, Figure 16 , 17 , 18 are respectively the ΔP of the first, second and third regions using PID control and SMC control GWi (t) response, Figure 19 , 21 , 23 are the switching functions σ of the first, second and third regions respectively i (t) response, Figure 20 , 22 , 24 are the controller output u of the sliding mode controller constructed in the first, second, and third areas respectively i (t) response.

Embodiment 3

[0160] In this embodiment, the system takes Generation Rate Limiting (GRC) into account, where, Figure 25 is a nonlinear turbine considering GRC, Figure 26 is the Δf of the controller using the constructed sliding mode controller in all three domains i (t) response, Figure 27 is the ΔP of the controller using the constructed sliding mode controller in all three domains tiei (t) response, Figure 28 is the ΔP of the controller using the constructed sliding mode controller in all three domains GWi (t) Response. The simulation results show that the proposed SMC control can still guarantee the stability of the system when considering the generation rate limitation (GRC).

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Abstract

The invention discloses a multi-domain new energy interconnection electric power system and a design method thereof. The multi-domain new energy interconnection electric power system includes three subsidiary electric systems. Each subsidiary electric system includes a turbine and a cell, a first area subsidiary electric system uses a non-reheating type steam turbine, and the second and third subsidiary electric systems use reheating type steam turbines respectively. The frequency control is optimized by means of a slip form control method which is a typical non-linear control method, and using the slip form control method, each area is integrally modeled and is subjected to decentralised control, the response speed is fast, and the robustness is good. By means of the smooth output power of an energy-storage module, the frequency offset of the system can be finally reduced.

Description

technical field [0001] The invention belongs to the technical field of load frequency control of a multi-domain interconnected power system, and in particular relates to a multi-domain new energy interconnected power system and a design method thereof. Background technique [0002] With the widespread application of wind power generation, its impact on power system operation and control has attracted widespread attention. In the interconnected power system of high-penetration wind power generation, the fluctuation of wind energy will cause the imbalance of system power supply and demand, the deviation of system frequency, and even the system collapse in severe cases. Therefore, in the interconnected power system containing wind power generation, its frequency control is more challenging than that of the traditional power generation system. [0003] The control quantity of the system load frequency control (LFC) on the generator set is generally composed of two components: t...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/28
Inventor 厉建新米阳李建勇任鲁飞李兆春张守海焦建亮张军王利民张文春杨洋
Owner STATE GRID SHANDONG ELECTRIC POWER COMPANY RIZHAOPOWER SUPPLY
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