Variable sampling rate control method for terminal voltage of solar panel
A solar panel and control method technology, applied in the direction of converting irreversible DC power input to AC power output, generator/motor, photovoltaic power generation, etc., can solve the problem of integrator saturation, ineffectiveness, and affecting the power generation of the panel and other problems to achieve the effect of avoiding voltage oscillation problems
Active Publication Date: 2014-12-24
CSIC HAIWEI ZHENGZHOU HIGH TECH CO LTD
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Problems solved by technology
The disadvantages of this control method are: 1. The operating frequency is fixed and does not match the time constant of the terminal voltage change. Matching different panels often causes the integrator to saturate or fail to work.
2 The terminal voltage of the battery board oscillates near the command voltage, which affects the power generation of the battery board
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[0018] like figure 1 , figure 2 As shown, the principle of the present invention is as follows: the inverter first detects the terminal voltage of the solar panel within a certain period of time, and calculates the rate of change of the terminal voltage, and then collects the output of the inverter commanded by the controller during the same period . Based on this, the inverter voltage control link identifies the time constant of the terminal voltage, and then changes the integral coefficient of the voltage control in real time according to the identified time constant. The specific control method is:
[0019] (1) The inverter detects the terminal voltage of the solar panel within a certain period of time U DC , and collect the output of the controller command of the inverter in the same period C out ; The above battery panel terminal voltage refers to: the voltage difference between the positive pole and the negative pole when the solar cell module generates electricit...
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A variable sampling rate control method for the terminal voltage of a solar panel comprises the steps that an inverter detects the terminal voltage UDC of the solar panel, the output amount Cout of controller instructions of the inverter in the same period is collected and the terminal voltage UDC and the output amount Cout are subjected to differentiation, and the interval in which the monotonicity of the terminal voltage and the monotonicity of the output amount are consistent is selected; the variable rate of the terminal voltage and the controller output amount are obtained in the monotonicity interval; if the length of the monotonicity interval is larger than or equal to a threshold value, the time constant T of the terminal voltage is worked out according to the terminal voltage UDCand the output amount Cout; a proper terminal voltage control period is selected according to the detected time constant T to carry out control, and one tenth of the time constant T is used as the control period. By means of the variable sampling rate control method for the terminal voltage of the solar panel, the voltage adjustment link of the inverter and the time constant of the terminal voltage of the solar panel are made matched, and therefore the problem of voltage oscillation caused by integral saturation is avoided.
Description
technical field [0001] The invention belongs to a control method in a solar power generation system, and in particular relates to a control strategy for a solar panel terminal voltage. Background technique [0002] Solar panels generate electricity through sunlight, and the output is direct current, which cannot be connected to the grid for operation. Therefore, an inverter is needed to convert the DC power into a power frequency AC power. Solar panel volt-ampere curves are non-linear and vary with environmental influences. In order to make the battery panel output as much electric energy as possible, most photovoltaic inverters have a voltage regulation link. The characteristics of solar panels are different, there are various forms of series and parallel connection, and they have different time characteristics. [0003] At present, the voltage loop of photovoltaic inverter basically adopts conventional PID regulator. The disadvantages of this control method are: 1. The...
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IPC IPC(8): H02N6/00H02M7/42
CPCY02E10/50
Inventor 王笑非高瑛谢战洪向阳王大鹏马新科李满刘萍王涛
Owner CSIC HAIWEI ZHENGZHOU HIGH TECH CO LTD