A cooperative control method for photovoltaic generators without a master control center

A technology for photovoltaic generators and generator sets, applied in photovoltaic power generation, single-network parallel feeding arrangements, etc., can solve problems such as inability to achieve effective power distribution and control

Inactive Publication Date: 2016-08-17
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when there are a large number of photovoltaic generators in the power network, this method cannot achieve effective distribution and control of power, so it cannot provide auxiliary services for the power network, such as smooth load, frequency and voltage control, etc.

Method used

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  • A cooperative control method for photovoltaic generators without a master control center
  • A cooperative control method for photovoltaic generators without a master control center
  • A cooperative control method for photovoltaic generators without a master control center

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specific Embodiment

[0090] exist Figure 5 The control method proposed by the present invention has been simulated in the simulation example diagram shown. Each node in the figure represents a node in the power network, for example, numbers 1 to 114, 149, 150, 195, 250, 251, 300, 35, 450, 451 in the figure, PV1 to PV10 are located at the nodes where photovoltaic power generation is installed machine.

[0091] The simulation test parameters are shown in Table 1.

[0092] Table 1

[0093]

[0094]

[0095] Set up simulation model in Matlab / Simulink, adopt the control method that the present invention proposes, gained simulation experiment data:

[0096] When the power command of the photovoltaic generator sets changes suddenly: the reserve ratio of each photovoltaic generator β i Track to command value β 0 If the time is less than 2.5s, the calculated value P of the output power of the photovoltaic generator set out Track to command value P 0 The time is less than 1.6s, the estimated v...

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Abstract

The invention discloses a cooperative control method applicable to a photovoltaic generator set without a main control center. Auxiliary variable iterative calculation is introduced so that an output power of the photovoltaic generator set is obtained; through a high-level controller, a stocking rate instruction value is calculated; approximate calculation is carried out on a maximum power output by each photovoltaic generator and then measured values of stocking rates are calculated; a communication matrix is established, and through a bottom layer controller, reference values of the stocking rates and reference values of DC bus voltages of grid-connected inverters are calculated; and through a voltage current double-closed-loop PI control method of the photovoltaic grid-connected inverters, stable control of output power of each photovoltaic generator is realized. The method does not need to arrange a main control center to control the photovoltaic generator set so that communication device and cost are saved and operation robustness is improved and a plug and play function is realized; and cooperative control of output powers of a large number of photovoltaic generators which are geometrically distributed is realized and support is provided to smoothing of load fluctuations of an electric power network and improvement of voltage and frequency stability in the electrical power network.

Description

technical field [0001] The invention relates to a control method for a photovoltaic generator set, in particular to a coordinated control method for a photovoltaic generator set without a main control center. Background technique [0002] Solar energy has the advantages of non-pollution, renewable and large reserves, so solar photovoltaic power generation will be widely used. However, due to the randomness and volatility of the output power of photovoltaic generators, when a large number of photovoltaic generators are connected to the power network, it will have an adverse effect on the security and reliability of the power network. Therefore, it is necessary to develop a control method for coordinating the output power of photovoltaic generators, so as to uniformly control the output power of a photovoltaic generator set composed of a large number of photovoltaic generators. [0003] The existing control methods for the output power of photovoltaic generator sets include c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 辛焕海赵睿刘云齐冬莲张国月
Owner ZHEJIANG UNIV
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