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Photovoltaic power station virtual synchronization control method and control system thereof

A photovoltaic power station, virtual synchronization technology, applied in the direction of photovoltaic power generation, electrical components, circuit devices, etc., can solve the problem of no synchronous generator, etc., achieve fast response time, high precision, and cost-saving effects

Active Publication Date: 2017-05-31
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both the demonstration project and the enterprise standard are aimed at the virtual synchronous generator modified by a single photovoltaic inverter, and there is no control technology for simulating the characteristics of the traditional synchronous generator for the whole power station

Method used

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  • Photovoltaic power station virtual synchronization control method and control system thereof
  • Photovoltaic power station virtual synchronization control method and control system thereof
  • Photovoltaic power station virtual synchronization control method and control system thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] In order to meet the needs of simulating the operating characteristics of traditional synchronous generators, the present invention provides a virtual synchronous control system for photovoltaic power stations. The active power and reactive power capabilities of the device are tested, including:

[0046] Acquisition module: used to collect photovoltaic power station data;

[0047] Primary frequency modulation module: used to determine the reserve capacity of primary frequency modulation and inertia link;

[0048] Spare capacity allocation module: used to allocate spare capacity;

[0049] Spare capacity release module: used to release spare capacity.

[0050] The specific functions are as follows:

[0051] Acquisition module: It is also used to collect the current maximum power point of each photovoltaic inverter equipped with a photovoltaic power station to track the maximum power output by MPPT, and calculate the current maximum output power of the photovoltaic power ...

Embodiment 2

[0075] 100MW photovoltaic power station, the photovoltaic power station is composed of 100 photovoltaic power generation units, and each photovoltaic power generation unit is equipped with a photovoltaic inverter of 1MW. When the photovoltaic power station adopts virtual synchronous control technology, according to figure 2 According to the requirements of the primary frequency regulation and the State Grid Corporation's enterprise standard "Unitized Photovoltaic Virtual Synchronous Generator Technical Requirements and Test Methods", photovoltaic power stations should reserve 10% of the reserve active power for primary frequency regulation and virtual inertia.

[0076] Since the output power of photovoltaic power plants is affected by solar irradiance, the output power of photovoltaic power plants is volatile. The working status of the photovoltaic inverter equipped with the photovoltaic power station is shown in Table 1:

[0077] Table 1 Working state of photovoltaic invert...

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Abstract

The invention relates to a photovoltaic power station virtual synchronization control method and a control system thereof. The control method comprises the following steps of (1) acquiring photovoltaic power station data; (2) determining primary frequency modulation and inertial element reserve capacity; (3) distributing the reserve capacity; (4) releasing the reserve capacity. According to the technical scheme provided by the invention, a photovoltaic power station has no need to be provided with an extra energy storage device, so that the cost is saved, and the primary frequency modulation retention time of the photovoltaic power station is not restricted by the capacity of the energy storage device. When the photovoltaic power station is provided with enough inverters, only photovoltaic inverters at a hot standby state are need to be switched on and off, an active power output value has no need to be controlled, and the requirement can be met, so that the response time is faster, and the accuracy is high.

Description

technical field [0001] The invention relates to a virtual synchronization control technology of a photovoltaic power station, in particular to a virtual synchronization control method and a control system for a photovoltaic power station. Background technique [0002] As of the end of 2015, the total installed capacity of photovoltaic power generation in the country reached 43.18 million kilowatts. In many provinces and regions in Northwest China, the penetration rate of new energy power generation has exceeded 30%, becoming one of the main power sources. Since the traditional photovoltaic power station does not have the ability of primary frequency regulation, the inertia level is low. As the proportion of large-scale photovoltaics connected to the grid increases, the inertia level of the power system will decrease, which will affect the safe and stable operation of the system. In order to ensure the safe and stable operation of the power grid under the condition of fully c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/385Y02E10/56
Inventor 李臻陈志磊秦筱迪张军军牛晨晖
Owner CHINA ELECTRIC POWER RES INST
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