Power grid frequency modulation method and device

A control method and power grid technology, applied in circuit devices, photovoltaic power generation, electrical components, etc., can solve problems such as prominent operation control problems, inability to provide power system auxiliary services, and strong randomness.

CN107181266AActive Publication Date: 2017-09-19CHINA ELECTRIC POWER RES INST +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-09-19

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Abstract

The invention provides a power grid frequency modulation method and device. The method comprises steps of determining a photovoltaic power supply active power reference value and a voltage / current outer feature curve of a photovoltaic power supply, determining output power of the photovoltaic power supply, and generating an output P-U curve of the photovoltaic power supply; searching voltage corresponding to the active power reference value of the photovoltaic power supply on the output P-U curve of the photovoltaic power supply and defining the voltage to be a photovoltaic power supply outlet direct current voltage reference value; and fitting the photovoltaic power supply outlet direct current voltage reference value and grid-connected side frequency, and generating a photovoltaic power supply frequency modulation control feature curve. According to the invention, by changing the output power of a photovoltaic plant, the network relating features of the photovoltaic plant are improved; and it is achieved that the photovoltaic power supply participates in the system frequency modulation.
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Description

technical field

[0001] The invention relates to a control method and device, in particular to a power grid frequency modulation control method and device. Background technique

[0002] Solar energy is clean, non-polluting and rich in resources, which can effectively alleviate the pressure on the power industry caused by the energy crisis and environmental crisis. In recent years, the solar photovoltaic industry has developed rapidly, and the installed capacity of power generation has continued to grow.

[0003] When the installed capacity of photovoltaic power generation is low, the impact of grid-connected operation on the grid is negligible. Meanwhile, considering the high cost of photovoltaic power generation, it usually operates in a maximum power point tracking (MPPT) mode. Under this control method, the output of photovoltaic power generation is volatile and unpredictable, and cannot provide the auxiliary services required by the power system. Therefore, traditional ...

Examples

Embodiment Construction

[0047] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0048] The topology of the traditional bipolar photovoltaic grid-connected power generation system is as follows: figure 1 As shown, the photovoltaic array is first boosted by the Boost chopper circuit, and then the DC power is converted into AC power through the inverter to realize grid connection. It mainly includes photovoltaic arrays, filter capacitors, Boost choppers, inverters, filters and Communication system and other parts. figure 1 The grid-connected mode shown includes three control parts: ①Inverter double-loop control; ②Boost chopper control; ③Maximum power tracking control. By controlling the switching device action strategy of the chopper, the maximum power point tracking of the photovoltaic array can be realized. The inverter mainly implements grid-connected control, and its control system adopts a double-loop c...