TW201102781A - Maximum power tracking system of wind power generation system - Google Patents

Abstract

The present invention provides a maximum power tracking system of wind power generation system, which includes a wind power generator, an AC/DC transformer coupled to the wind power generator, a DC/DC transformer coupled to the AC/DC transformer, a DC/AC transformer coupled to the DC/DC transformer, a maximum power tracking control unit coupled to the AC/DC transformer and the DC/DC transformer, and a city electricity network system coupled to the maximum power tracking control unit; whose method lies in: by means of a DC/AC transformer to output the electric current command size and feed back an AC/DC transformer to output the DC voltage, the variation situation of the DC voltage is observed to use as the basis of adjusting the outputting electric current command size of the DC/AC transformer in the next step. The maximum power tracking technology is only necessary to retrieve the voltage value, without necessary to practically calculate the output power of the wind power generator, to achieve the purpose of maximum power tracking.

Description

201102781 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a method for maximizing the tracking of a power-generating system, and in particular to a method for tracking the maximum pants that can be outputted under different conditions. [Prior Art]

According to recent developments in the industry, the demand for energy has also increased year by year. Excessive use of petrochemical resources has led to a gradual shortage of limited petrochemical resources. A large number of warm-recorded bodies have been produced due to the burning of petrochemical secrets, which has accelerated the overall warming and seriousness. Environmental pollution, in order to reduce the carbon dioxide emissions of petrochemical energy, 'the world is not actively looking for alternative energy sources. Among them, safe and pollution-free and inexhaustible renewable energy has become an important government in recent years. The economic governance goal; renewable energy mainly uses wind, water, tidal energy, biomass, solar energy and geothermal energy as natural power sources. The wind power generation system is mainly composed of blades, generators and power electronics. The wind power generation system is composed of blades, generators and power electronic systems. The wind power system drives the blades to rotate by the wind. It can be converted into mechanical _ energy, and the rotary rotor converts mechanical energy into electrical energy. Because the wind has an output power curve, each curve has a maximum output power: at wind speed

= Use electronic power equipment to convert the electric energy generated by the generator into a stable supply of electricity, supply various types of fH or use the same system, the output power of the L motor will change with the wind speed. Under the wind speed: point, for 201102781, the wind power line can be turned to work at the maximum output power point at every wind speed, so the maximum power tracking technology must be used to control the speed of the wind turbine to achieve the maximum output of the wind turbine. The purpose of power. Among the existing related literatures, the most frequently mentioned and applied maximum power tracking technology is mainly to distinguish between the method and the three '_ method, which mainly relies on periodically increasing or decreasing the duty cycle of the power switch, and The output voltage and current of the wind power generation system are calculated. The output power of the wind turbine is calculated, and the output power before and after the change of the duty cycle is compared. As the basis for adjusting the size of the duty cycle in the next step, if the output power becomes larger, the duty cycle is in the same direction. If the output power is small, the duty cycle is adjusted in the opposite direction. Therefore, the disturbance is disturbed and the observation is better. The wind power generator reaches the maximum power point. The three-point weight method is mainly based on the observation of the three-point duty cycle. Corresponding to the output power, and comparing the magnitude relationship between the three points of power 'calculate the size of the female position value. Although the quasi-a bit weight method can improve the shortcomings of the disturbance observation method, its operation parameters are more complicated, resulting in a longer power tracking time. The above two maximum power chasing 7 technologies must all output the output power of the wind power generation system. In order to achieve the goal of maximum power tracking. SUMMARY OF THE INVENTION In view of the above-mentioned deficiencies, the inventors have intensively conceived research and development creations, and have worked hard for a long time. The main purpose of the present invention is to provide a tracking method for enabling wind turbines to output maximum power at different wind speeds. 201102781 In order to achieve the above objectives, this issue of _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ϋ 之 / / / / / / J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J The control unit is connected to the city grid system by the method of: - New Zealand / AC to rectify (four) age, and feedback the output DC voltage of the AC / DC converter to observe the change of the output DC voltage情 % 'As a decision - step to adjust the money / cross-change for the basis of the size of the H-flow tu f flow command 'The maximum power tracking Lin only need Na Na voltage value, no need to actually calculate the output power of the wind turbine, ie Maximum power tracking can be achieved. [Embodiment] The present invention has been described in detail with reference to the accompanying drawings in which: Referring to the first and second embodiments of the present invention, the present invention includes: a wind turbine 10' wire absorbs wind and converts wind power into alternating current; a parent current/DC converter 20' Coupling with the wind turbine 1〇, having a voltage loop 'converts the alternating current generated by the wind turbine 1〇i into a DC voltage VdeI' and controls the duty cycle of the power switch through the voltage loop to stabilize the output of the DC voltage of 201102781 Vdel; Straight machine conversion thief 3 〇 'system and AC / DC converter % vehicle connection, to the exchange _ please change (four) fine DC level upgrade, so that the DC / AC conversion n 2G will wind turbine 1Q The generated electric energy is injected into a DC voltage V&2 of a city grid system 60; - DC/AC converter 4〇, with DC/DC converter % reduction, converts direct electromechanical [vde2 into AC voltage, makes wind power The electric energy of the generator (1) is injected into the city grid system 60; a maximum power chasing unit 50, -_ and the AC/DC converter and the straight W 转换 conversion If 4G _ connection, the other side of the city Electric network system 6〇 lightly connected to the maximum The power converter has a sinusoidal conversion circuit controller 51 and a maximum power tracking algorithm. The DC/AC conversion circuit controller 51 has a current detecting circuit 52, a zero detecting circuit, and a digital sine. A wave table 54 multiplier, a subtractor, a κ times error amplifier, a controller 56, and a pulse width view output circuit 57, wherein the current detecting circuit 52 mainly captures the DC/AC converter 4 The output current is converted into current feedback, and the zero circuit circuit 53 is mainly used as the zero voltage point of the AC voltage of the city grid system 60, and is used together with the digital sine wave table 54 to generate the same as the city grid system. The sinusoidal voltage signal of the same phase of the alternating voltage, the multiplier is the output current command size of the sinusoidal signal and a set DC/AC converter 4〇! The set multiplies the generation-input current reference lobes u, and the doubling error amplifier 55 amplifies the error signal by K times, and finally sends the dc current to the pulse width modulation output circuit 57' via the control 201102781 to generate the DC/ The switching signal of the AC switch 40 power switch. The power grid system 60 is connected to the maximum power tracking control unit 5; Referring to the third figure, the method of the present invention is: the user first sets the DC converter 40 output current command size initial value and AC/DC. Converter 20 regulator reference value Vwind-ref 'waits for a period of time to wait for the wind turbine 1 〇 speed change, and feedback AC / DC converter 20 output DC voltage Vwind_out, car Vwmd-ref and size 'to decide One-step DC/AC converter 40 output current command size increase loop and reduce loop;

Vwind-ref' then output current command size increase loop via DC/AC converter 4'. The loop mainly increases the output current command size of the DC/AC converter 40, and judges whether it is zero by a Z Z2, Zl Z2 is mainly used to judge the following situation: L Z1 is used to judge whether the AC/DC converter 20 can output a stable DC voltage after reducing the DC/AC converter 4〇 output current command size. After the DC/AC converter 40 outputs the current command size, the 5H current/DC converter 2〇 can output a stable DC voltage, then zl=1; conversely, if the AC/DC converter 20 cannot output a stable DC voltage. , then continue to reduce the size of the money / exchanges 1 40 loses the electric ride. • 2 is used to judge whether the output voltage of the wind turbine 10 increases or decreases when the output current command value of the DC/AC converter 40 is fixed. 201102781 If the output voltage of the wind turbine 10 decreases, B, otherwise, The right wind turbine 10 outputs an alternating current increase' to return to observe the AC/DC converter 20 output DC voltage change.

The flow control of Zl and Z2 is as follows: 1. If Z1-0 ' indicates that the system operating point has not reached the maximum power point, the record increases the value of the set value after the output current command size of δXuan DC/AC converter 40 is the first setting. The value Isetl, and return to observe the AC / DC converter 2 〇 output voltage change situation, determine the next step of the DC / AC converter 4 〇 output current command size increase or decrease, if zi = l, then determine whether Z2 is 〇 . 2. If Z2=0, the DC/AC converter 4〇 output current command size is fixed to the DC/AC converter 40 output current command value of Isetl, and Z1 and Z2 are reset to zero, and then the wind turbine 1观察 is observed. Output AC power transformer change situation, if the AC voltage increases, return to observe the AC / DC converter 2 〇 output voltage change, determine the next step of DC / AC converter 4 〇 wheel current command size increase or decrease; If the AC voltage is reduced, set 22 to 1, and jump to reduce the DC/AC converter 4〇 output current command size loop. If Z2=l, return Z2 to zero and return to observe AC/DC converter plus output. In the case of a voltage change, it is determined that the down-step DC/AC converter wheel current command size is increased or decreased. If vwind_0ut>vwind_ref', the current command size reduction loop is issued via the DC/AC converter, the loop mainly reduces the DC/AC conversion crying 4〇 output current command size, and observes the AC/DC converter 2 turns Straight) Ning 201102781 Electric [wmd-out k Jf shape, if, continue to reduce the DC / AC converter 4 know the age of the order, otherwise: wind-out = V Wind-ref 5 then set Z1 to 1 The above-mentioned urban power grid system 6〇 can be regarded as a fixed value of AC power because it cannot control its AC voltage. Its effective value vms can be expressed as Equation 1:

The DC/AC conversion ϋ 4G transmission current RMS U can be expressed as two: / — I peak

Ms^lT Therefore, the DC/AC converter 40 vocalizes the _ green 6G output power can be expressed as the third ' is the phase difference between the DC/AC converter 4G output current and the AC grid system 60 AC voltage Angle: P〇u, ~ Vrms · Kms COS0 Two-control DC/AC converter 4G output current is in phase with the AC voltage of the city's power grid system' At this time, the DC no-current converter 40 output voltage can be expressed as Equation 4: In addition, referring to the fourth embodiment, a second embodiment of the present invention includes: a wind power generator 1G', an AC/DC converter 20' with a wind power generator 1G, and an AC/DC conversion. 20, coupled DC/AC converter 4〇, - with AC/DC converter 20, and DC/AC converter 4〇, maximum power tracking unit 50' and - connected to maximum power tracking unit 5 (4) City power grid system ^ 60; If the wind turbine 10' drum wire pressure is enough to make the flow / DC turn 9 201102781 converter 20 'output voltage to reach the DC voltage level of the city grid system 6 ' ' The DC/DC converter 30 as in the foregoing embodiment can be omitted. Because the AC grid system 60, 60, the AC voltage amplitude does not change much, can be regarded as a constant, so the fourth type can be known, the wind power system output power and the DC / parent converter 40, 40, the output current It is directly proportional, so only need to control the DC / parent flow conversion 11 4G, 4G, the size of the A can control the wind turbine lG, l〇, output power, and then control the speed of the wind turbine 1〇, 10, to reach the maximum Power tracking + purpose.

It is based on the maximum power tracking technology that the invention has been carried out in the _ observation method and the three-point method. It does not need to actually calculate the wind output per motor, only take the voltage signal and change it. The dynamic observation method is the most complicated shortcoming in the most power_near_about and three-antifications--the above-mentioned invention can achieve the intended function and purpose, and the details are implemented by the skilled person, The above embodiments are only used by Z. All equivalent methods are not deviating from the present invention. 10 201102781 [Simplified description of the drawings] The drawings are not in the first block of the first embodiment of the present invention. The third embodiment of the present invention is a block diagram of the second embodiment of the present invention. The main component symbol is shown in the fourth embodiment of the present invention. Description] Wind Turbine - 1〇交交/吉

Also Xian / / DC converter - a 2 〇 60 straight W DC converter _3 〇 city grid system called DC / AC converter ~ 40 DC / AC conversion circuit controller, tracking control unit - 50 zero point _ circuit ~ 53 ° Current_Circuit a 52 K times error amplifier 54 ^ Controller - ~ 56 Pulse width view round out f __5?

Vwind_rc "fVA__i pressure reference value Vwind-cmt - AC / DC 。.",, L conversion read DC voltage value Ζ2---DC / AC conversion Iset---Set value Π::: Converter wheel Current reduction command valuer round current fixed command value pair wide - first set value 11

Claims (1)

201102781 VII. Patent application scope: 1. A maximum power tracking method for wind power generation system, one ☆ ^ - ·.- ' : an AC/DC converter connected to wind power generation, two: power generation for conversion Connected DC/DC converter, and < DC to / AC surface 峨; DC large by adjusting the money / AC quiescent device / electric riding AC / DC converter output control DC surface; ^ feedback The situation of the red-red change is determined as the next step-by-step adjustment == the table is dry and straight, the brain is still _ _ _ _ 贱 电 ® , 点 点 点 点 点 点 点 点 点 点 点 点 点 点 风力 风力 风力 风力 风力 风力 风力 风力 风力 风力Increase the DC / AC converter output current command size and vice versa ^ green / DC converter output can not be converted to output stable DC voltage, then the table ^ t · Uu conversion read current command value is too large, wind power system operating point change Ζ Ζ force The maximum output power point of the motor, at this time, it is necessary to reduce the DC/AC conversion n' and record the DC/AC converter output current command value of the last AC/DC converter capable of weeping, _J疋 DC voltage, the straight two conversion wheel Power out The flow command value is the maximum power output of the wind turbine. The waiter is closed. The direct current/AC converter output current command size is reduced to enable the AC to convert the H output to a stable DC voltage, and the next step is the charm flow/AC conversion. 12 2〇11〇2781 The wheel current command size is fixed to the previously recorded DC/AC converter wheel current command value. 'When the DC/AC converter wheel current command value is fixed, the wind power increases or When reducing, the maximum power point of the wind turbine is changed, which causes the DC/AC converter output current command value to be no longer the maximum power point of the wind turbine output. However, the wind turbine output voltage will be S speed. The size changes, so it is only necessary to adjust the money/green-powered riding and riding materials by observing the wind turbine output AC, and the above steps can make the wind turbine output the maximum power at different wind speeds. 'So taking the voltage value, there is no need to actually calculate the wheel power of the wind turbine. ,and