Power circuit and photovoltaic power generation system including power circuit

A photovoltaic power generation system and power circuit technology, applied in photovoltaic power generation, circuit devices, AC network circuits, etc., can solve the problems of large electromagnetic radiation, shortened life, electromagnetic environmental pollution, etc., and achieve simple circuit implementation, high reliability, and low cost cheap effect

Active Publication Date: 2019-03-26
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] In addition, a photovoltaic power generation system and a voltage compensation method are disclosed in the Chinese invention patent application with the publication number CN107086601A. The patent application uses the pulse voltage output by the voltage compensation device to perform voltage compensation on the photovoltaic strings, thereby recovering the voltage generated by the PID effect. However, since the voltage compensation device has no specific implementation method, it only proposes that its function is to output pulse voltage. The pulse voltage given in the specific implementation includes three forms: square wave, triangular wave and trapezoidal wave. Figure 5 the nature of A and Figure 5 C is the same as in Figure 5 In A, t1 and t2 are the rising edge and falling edge respectively, which cannot be idealize

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  • Power circuit and photovoltaic power generation system including power circuit
  • Power circuit and photovoltaic power generation system including power circuit
  • Power circuit and photovoltaic power generation system including power circuit

Examples

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Example

[0059] First embodiment

[0060] See figure 1 , figure 1 It is a schematic diagram of the power supply circuit according to the first embodiment of the present invention. The components and connections are as follows:

[0061] figure 1 The power supply circuit shown includes BOOST circuit and CCFL conversion circuit;

[0062] BOOST circuit includes MOS tube K1, diode D1, inductor L1 and capacitor C1;

[0063] The CCFL oscillation circuit includes a starting circuit composed of resistor R1 and capacitor C2, capacitor C3, inductor L2, transistor TR1, transistor TR2, transformer B, primary windings NP1 and NP2, feedback windings NB1 and NB2, and secondary winding NS1, which start The circuit includes at least two terminals. One end of the resistor R1 is the start input end, and the connection point between the other end of the resistor R2 and one end of the capacitor C2 is the start output end. This embodiment is a device that provides start current for two oscillation transistors TR...

Example

[0096] Second embodiment

[0097] Figure 4 This is a schematic diagram of the improved power supply circuit of the second embodiment of the present invention applied to the photovoltaic power generation system. Since the photovoltaic string is equivalent to a diode connected in series with it, in order to improve the activation effect, a set of DC is connected in series at the output of the power supply circuit Power source E, that is, a set of DC power source E in series with the photovoltaic string, the series method is one of the following two:

[0098] (1) The negative pole of the DC power supply is electrically connected to the second output terminal of the power supply circuit, the first output terminal of the power supply circuit is electrically connected to the positive pole of the photovoltaic string, and the negative pole of the photovoltaic string is electrically connected to the positive pole of the DC power supply;

[0099] (2) The negative pole of the DC power supply i...

Example

[0102] The third embodiment

[0103] Figure 5 This is a schematic diagram of the power supply circuit of the third embodiment of the present invention. The difference between the third embodiment and the first embodiment is that the resistor R1 is replaced with a constant current source, and the current direction is the same, so that the CCFL conversion circuit can be realized when the input voltage drops. Due to the existence of the constant current source, the current provided to the bases of the two push-pull transistors TR1 and TR2 is constant, so that the input voltage of the power supply circuit can be wider. As mentioned above, when the operating voltage drops from 319V to 36V At this time, since the base current provided by the constant current source to the transistor TR1 or TR2 is not reduced, the CCFL converter will not stop vibration. In order to adapt to the wide-range terminal voltage of the photovoltaic string. The working principle of this embodiment and its appl...

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Abstract

The invention discloses a power circuit and a photovoltaic power generation system including the power circuit. The power circuit is a two-stage topological power circuit. The first stage is a BOOST circuit which processes an input low-voltage direct current into a direct voltage of which the output voltage decreases with time. The second stage is a CCFL conversion circuit. Because the CCFL conversion circuit works in open loop, the peak value of the sinusoidal alternating current output by the CCFL conversion circuit is directly proportional to the working voltage of the CCFL conversion circuit. The voltage decreases with time, namely, the peak value of the sinusoidal alternating current output by the CCFL conversion circuit decreases with time. Thus, the effective value of the sinusoidalalternating current also decreases with time, and an attenuated sinusoidal alternating current voltage is obtained. The voltage acts on the two ends of an activated photovoltaic string, which makes the voltage waveform delta(U)/dealt(t) output by the power circuit small. Therefore, the service life of the photovoltaic string is prolonged, and the radiation to the environment is low. Moreover, thepower circuit of the invention is simple to realize and low in cost.

Description

technical field [0001] The invention relates to a power supply circuit for a photovoltaic power generation system, in particular to a power supply circuit for activating aging photovoltaic strings. Background technique [0002] With the expected depletion of fossil energy and the environmental pollution it brings, the research and application of renewable clean energy has been highly valued by countries all over the world. Among them, wind power generation and photovoltaic power generation technology have become the main research hotspots. Photovoltaic power generation is the abbreviation of solar power generation. The development and research of photovoltaic power generation in my country started in the 1970s, entered a period of stable development in the 1990s, and began to focus on the research of solar photovoltaic power generation in the 21st century. In 2000, my country's photovoltaic technology has entered the stage of large-scale grid-connected power generation. [0...

Claims

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Application Information

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IPC IPC(8): H02M3/155H02M3/338H02J3/38
CPCH02J3/383H02M3/155H02M3/3382Y02E10/56
Inventor 王保均
Owner MORNSUN GUANGZHOU SCI & TECH
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