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Photovoltaic inversion control device and model free control method based on field programmable gata array (FPGA)
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A photovoltaic inverter and control method technology, applied in the field of control, can solve problems such as difficult modification, unfavorable miniaturization, and difficult high-precision inverter output for analog control, so as to achieve stable and accurate control effect, flexible and tailorable Effect
Inactive Publication Date: 2014-03-05
NORTHEASTERN UNIV LIAONING
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[0002] With the rapid development of the photovoltaic industry, traditional analog control is difficult to achieve high-precision inverter output, and the ever-changing digital products provide new design tools for photovoltaic inverter devices
The traditional analog control device has the following disadvantages: the control circuit is complicated, there are many components, which is not conducive to miniaturization; the flexibility of the control device is very poor. Realize a new type of intelligent control method, so the development and use of field-programmable digital photovoltaic inverter devices have broad application prospects
In view of the nonlinear characteristics of the photovoltaic inverter circuit, the traditional control method has the following disadvantages: for the nonlinearity of the photovoltaic inverter system, it is difficult to establish an accurate mathematical model, which affects the effectiveness and reliability of the controller design; and the control parameters Difficult to optimize, controller parameters cannot be tuned online
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Embodiment 1
[0037] Step 1: Set initialization parameters: y *(k)=24V, η k = 1, ρ k =1.97, λ=0.017, μ=0.1,
[0038] Step 2: The embedded soft core reads the instantaneous reference voltage value Q generated by the angular wave circuit as shown in Table 1, and the voltage value y(k) at the load terminal of the photovoltaic inverter system collected by the voltage sensor in the current cycle is shown in Table 2:
[0039] Table 1 is the instantaneous reference voltage value (Q) of the angular wave circuit
[0040]
[0041] Table 2 shows the load terminal voltage value y(k) of the photovoltaic inverter system
[0042]
[0043] The first column value of the second row of the embedded soft core reading table 1 is Q=1.1, and the first column value of the second row of the embedded soft core reading table 2 is y(k)=23.2;
[0044] Step 3: Calculate the pseudo partial derivative value, the formula is:
[0045]
[0046] Step 4: Calculate the control law, the formula is:
[0047] ...
Embodiment 2
[0050] Step 1: Set initialization parameters: y * (k)=24V, η k = 1, ρ k =1.97, λ=0.017, μ=0.1,
[0051] Step 2: the embedded soft core reads the second column value of the second row of Table 1 as Q=0.2V, and the embedded soft core reads the second column value of the second row of Table 2 as y(k)=23.996 ;
[0052] Step 3: Calculate the pseudo partial derivative value. Since Δu=0.004<ε=0.01, the pseudo partial derivative takes the initial value:
[0055] Step 5: When PWM=1, figure 1 Middle V 1 and V 4 conduction, V ...
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Abstract
A photovoltaic inversion control device and a model free control method based on a field programmable gata array (FPGA) relate to the technical field of control. The model free control method mainly comprises a digitalized and field-programmable hardware design scheme and a model freeadaptive controlalgorithm suitable for hardware implementation. The photovoltaic inversion control device comprises a programmable gata array, a synchronous dynamic random access memory and a nonvolatile memory, wherein the programmable gata array comprises an embedded soft core, an angular wave circuit and an Avnlon bus module, and the embedded soft core and the angular wave circuit are respectively connected with the synchronous dynamic random access memory and the nonvolatile memory through the Avnlon bus module. An FPGA digital chip of a large scale integrated circuit is used in a photovoltaic inversion system firstly, the model free control method is adopted, thereby controlling output of an inverter accurately, and having the advantages of changing, debugging and adding other functions at any time and the like.
Description
technical field [0001] The invention relates to the technical field of control, in particular to an FPGA-based photovoltaic inverter control device and a model-free method. Background technique [0002] With the rapid development of the photovoltaic industry, traditional analog control is difficult to achieve high-precision inverter output, and the ever-changing digital products provide new design tools for photovoltaic inverter devices. The traditional analog control device has the following disadvantages: the control circuit is complicated, there are many components, which is not conducive to miniaturization; the flexibility of the control device is very poor, and once the control device is designed, it is difficult to make modifications and inconvenient to debug; the analog control device is difficult A new type of intelligent control method is realized, so the development and use of field-programmable digital photovoltaic inverter devices has broad application prospects....
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