Grid-connected off-grid small photovoltaic power generation system and control method
A photovoltaic power generation system and technology of photovoltaic cells, applied in the field of solar photovoltaic power generation, can solve the problems that the areas covered by the power grid are not easy to be widely promoted, increase the voltage fluctuation at the end of the power grid, and have high costs and maintenance costs, and achieve simple structure, reduced impact, and volume small effect
Inactive Publication Date: 2013-12-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
In order to maintain the continuity of power supply, batteries need to be configured in the system, and the cost and maintenance costs are relatively high, so it is not easy to be widely promoted in areas covered by the grid; the grid-connected operation mode is connected to the grid, without the need for a battery, and directly transmits energy to the grid
Since the common grid connection method is not coordinated with the local load, it is easy to have an impact on the grid when the light changes greatly, increasing the voltage fluctuation at the end of the grid
Method used
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[0051] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings.
[0052] figure 1 It is a structural diagram of the system hardware of the present invention. The system includes photovoltaic cell components, first capacitor C1, second capacitor C2, third capacitor C3, flyback converter, power frequency inverter, EMI filter, auxiliary load R z , auxiliary load circuit breaker K1, local load R L, grid-connected circuit breaker K2, first current sensor CT1, second current sensor CT2, third current sensor CT3, first voltage sensor VT1, second voltage sensor VT2, third voltage sensor VT3, drive module, and controller. The flyback converter is composed of transformer TX1, diode D, first power tube Q1, and second capacitor C2; the power frequency inverter is composed of second power tube Q2, third power tube Q3, fourth power tube Q4, and fifth power tube The EMI filter is composed of the inductor L1 and the third capacitor C3.
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The invention belongs to the technical field of solar photovoltaic power generation, and discloses a grid-connected off-grid small photovoltaic power generation system and a control method of the grid-connected off-grid photovoltaic power generation system. The grid-connected off-grid small photovoltaic power generation system comprises a photovoltaic cell assembly, a capacitor, a flyback converter, a power frequency inverter, an EMI filter, an auxiliary load, an auxiliary load breaker, a local load, a grid connection breaker, a voltage sensor, a current sensor, a drive module and a controller. Before grid connection, the system is operated in a voltage tracing mode, namely, the auxiliary load breaker is closed, the output voltage of the system is adjusted to enable the amplitude, frequency and phase of the output voltage of the system to be consistent with the amplitude, frequency and phase of the voltage of a grid, the grid connection breaker is closed, and the grid connection is accomplished. After the grid connection, the auxiliary load breaker is disconnected, and the system is turned into a load current tracing mode in order to ensure that power is not output to the grid. When the output power of the photovoltaic cell assembly is sufficient, the output current of the system traces the current of the local load; when the output power of the photovoltaic cell assembly is insufficient, the system is operated in a maximum power tracing mode, and the required power gap of the local load is complemented by the grid.
Description
technical field [0001] The invention belongs to the technical field of solar photovoltaic power generation, and in particular relates to a small photovoltaic power generation system and a control method. Background technique [0002] With the rapid growth of world energy demand and the gradual reduction of fossil energy, small-scale photovoltaic power generation systems have been widely used in recent years. The existing operation mode can be divided into independent operation mode and grid-connected operation mode. The independent operation mode means that it is not connected to the power grid and supplies power to nearby users independently. In order to maintain the continuity of power supply, batteries need to be configured in the system. The cost and maintenance costs are high, and it is not easy to be widely promoted in areas covered by the grid. Since the common grid connection method is not coordinated with the local load, it is easy to have an impact on the power g...
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IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 马良玉刘卫亮刘长良林永君陈文颖马进马永光
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)