Cooperative control method applicable to photovoltaic generator set without main control center

A technology for photovoltaic generators and generator sets, applied in photovoltaic power generation, single-grid parallel feeding arrangement, etc., can solve the problem of inability to achieve effective power distribution and control.

Inactive Publication Date: 2014-12-03
ZHEJIANG UNIV
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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 a

Method used

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  • Cooperative control method applicable to photovoltaic generator set without main control center
  • Cooperative control method applicable to photovoltaic generator set without main control center
  • Cooperative control method applicable to photovoltaic generator set without main control center

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Example Embodiment

[0089] The specific embodiments of the present invention are as follows:

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

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

[0092] Table 1

[0093]

[0094]

[0095] A simulation model is established in Matlab / Simulink, and the control method proposed by the present invention is adopted to obtain the simulation experiment data:

[0096] When the power command of the photovoltaic generator set changes suddenly: the reserve rate of each photovoltaic generator β i Track to command value β 0 The time is less than 2.5s, the calculated value P of the output power of the photovoltaic generat...

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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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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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