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Power frequency regulation control method and system for micro-energy grid system

A control method and micro-energy technology, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as insufficient frequency regulation capacity

Pending Publication Date: 2019-07-09
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

[0004] The invention provides a method and system for power frequency modulation control of a micro-energy network system. The problem of insufficient frequency modulation capacity of the frequency modulation method improves the frequency modulation efficiency of the micro-energy grid system and the stability of the micro-energy system operation

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  • Power frequency regulation control method and system for micro-energy grid system
  • Power frequency regulation control method and system for micro-energy grid system
  • Power frequency regulation control method and system for micro-energy grid system

Examples

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Embodiment 1

[0247] Example 1: There is a sudden increase in the load demand of the micro-energy grid:

[0248] A matlab simulation of an isolated power grid was performed to investigate the effect of frequency modulation of energy storage devices, gas turbine units, photovoltaic power generation systems, and air source heat pump loads. According to the general operating conditions, the upper limit of the primary frequency adjustment of the steam turbine unit is 10% of its rated active power.

[0249] The capacity of the energy storage device and the simulation of the photovoltaic power generation system in the MPPT mode are shown in Table 1. Before the disturbance, the pre-disturbance load can include the 0.5MW air source heat pump load. The output and frequency modulation capacity of the gas turbine generator set under the photovoltaic operation in MPPT mode are shown in Table 2:

[0250] Table 1. Simulation operating conditions

[0251] Load before disturbance (unit: MW) Energy storage ca...

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Abstract

The invention relates to a power frequency regulation control method and system for a micro-energy grid system. The method comprises the following steps: when a current frequency offset of the micro-energy grid system exceeds a frequency offset limit value, judging whether the state of charge of an energy storage system in the micro-energy grid system is higher than 30% of stored energy of the energy storage system or not; if the state of charge of the energy storage system in the micro-energy grid system is higher than 30% of the stored energy of the energy storage system, using the energy storage system in the micro-energy grid system to carry out frequency regulation on the micro-energy grid system; and if the state of charge of the energy storage system in the micro-energy grid systemis not higher than 30% of the stored energy of the energy storage system, using gas turbines, a photovoltaic power generation system and air source heat pumps in the micro-energy grid system to carryout the frequency regulation on the micro-energy grid system. The method and system adopting the technical scheme has the advantages that the powers of the energy storage system, the photovoltaic power generation system and the air source heat pumps are regulated for the frequency regulation on the micro-energy grid system, so that the problem of an insufficient frequency regulation capacity in the traditional frequency regulation method is solved, the frequency regulation efficiency of the micro-energy grid system is improved, and higher practicality and stability can be further achieved.

Description

Technical field [0001] The invention relates to the field of power frequency modulation control of a micro energy network, in particular to a method and system for power frequency modulation control of a micro energy network system. Background technique [0002] At present, the interconnected system of centralized power generation and long-distance transmission is the main form of China's power system. With the introduction of the concept of low-carbon economy and smart grid, distributed energy sources that are close to the user side and environmentally friendly have received more and more attention. Attention, the local integration of distributed energy can effectively improve the efficiency of energy utilization, and thus put forward the concept of micro energy grid. However, the capacity of micro energy grid is small, and the inertial time constant of the system is small. These characteristics lead to its operation. It is more susceptible to disturbances. Frequent disturbances...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 成岭金璐李克成钟鸣蒋利民杨硕宋国升高强覃剑郭炳庆闫华光齐格庞萌萌屈博黄伟
Owner CHINA ELECTRIC POWER RES INST
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