CN103390906A - Device and method for controlling wind turbine system to access DC (direct current) micro-grid - Google Patents
Device and method for controlling wind turbine system to access DC (direct current) micro-grid Download PDFInfo
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Abstract
The invention discloses a device and a method for controlling a wind turbine system to access a DC micro-grid. The device enables the wind turbine system to be in different work modes according to mode variable commands received from an energy manager, and the work modes include a maximum power point tracing mode, a constant voltage mode and a constant power mode. Corresponding control algorithms are operated under different work modes, therefore, the wind turbine system can adjust energy input into the DC micro-grid according to energy requirements of the DC micro-grid, then the wind turbine system is controllable, and the stable operation of the whole DC micro-grid can be facilitated; and besides, output power, power difference values, voltage difference values and the like of the wind turbine system are considered when the control algorithms are designed, so that the control accuracy, the reliability and the energy utilization ratio are high.
Description
Technical field
The present invention relates to wind generator system, relate in particular to control device and the control method thereof of wind generator system access DC micro-electric net.
Background technology
In recent years, under the dual-pressure of energy scarcity and environmental pollution, the wind power grid-connected generating system application is more and more.Yet, simply a large amount of wind power grid-connected generating systems directly is linked into and exchanges in large electrical network, will change the network topology of original system, thereby affect the distribution of trend, bring uncertainty to the stability of electrical network, and affected the quality of power supply.Therefore, when wind generator system is generated electricity by way of merging two or more grid systems, exist certain obstacle.
Exchange for improving the ability that large electrical network is received renewable energy power generation, exchange micro-electrical network and be suggested for connecting wind power generation distributed electricity generation system and exchanging large electrical network.Yet on the one hand, the electric energy sent from wind-force will be through the micro-electrical network of multistage power converter ability incoming transport, wind-force adopts the rear micro-electrical network of incoming transport of AC/DC/AC conversion usually; And to realize the control of the aspects such as grid-connected current amplitude, phase place, sinusoidal degree and harmonic wave simultaneously when the micro-electrical network of incoming transport, control complicated; In addition on the one hand, when electricity consumption, without conversion, directly use the situation of alternating current fewer and feweri, DC load generally adopts the structure of AC/DC/DC, and AC load generally adopts the structure of AC/DC/AC.Multi-stage transformation brought many negative consequences, such as the decline of efficiency of energy utilization, reliability reduction etc.In order to overcome these problems, in some occasion, propose to adopt the DC micro-electric net to replace exchanging micro-electrical network.
For guaranteeing the stable operation of DC micro-electric net, need to keep DC bus-bar voltage within the specific limits.Therefore the DC micro-electric net has plurality of operating modes usually, when wind generator system is accessed to the DC micro-electric net, need to take different control methods according to the residing operational mode of DC micro-electric net, so that the controlled stable operation with contributing to realize whole DC micro-electric net of wind generator system.
Summary of the invention
The problem that the present invention solves is to make the controlled problem with contributing to realize the stable operation of whole DC micro-electric net of wind generator system.
For addressing the above problem, the invention provides the control device that a kind of wind generator system accesses micro-electrical network, described wind generator system is connected in micro-electrical network by switching circuit, this device comprises current sampling circuit, the first voltage sampling circuit, second voltage sample circuit, processor and drive circuit, wherein, described current sampling circuit and the first voltage sampling circuit electric current and the voltage of wind generator system output of sampling respectively, the voltage of described second voltage sample circuit sampling DC bus, described processor receives the pattern variable order from energy manager, and the different value of this pattern variable order is corresponding with MPPT maximum power point tracking pattern, constant voltage mode or permanent power mode respectively, in the pattern variable order during corresponding to the MPPT maximum power point tracking pattern, calculate current power according to electric current and the magnitude of voltage of current sampling circuit and the sampling of the first voltage sampling circuit, the current voltage gathered according to the first voltage sampling circuit and the number of pole-pairs of generator are calculated the generator angular velocity of rotation ω (K) of wind generator system, also calculate the difference e P (K) of current power and last power, the difference DELTA ω of current generator angular velocity of rotation and last angular velocity of rotation (K) and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d<Δ dmax, eP (K)>0 and Δ ω (K)>0 or Δ d=Δ dmax, eP (K)>0 and Δ ω (K)>0 o'clock, by last time control signal add the above control signal increment and produce the first control signal, at Δ d<Δ dmax, eP (K)>0 and Δ ω (K)≤0 or Δ d=Δ dmax, eP (K)>0 and Δ ω (K)≤0 o'clock, by last time control signal deduct described control signal increment and produce the second control signal, at Δ d<Δ dmax, eP (K)≤0 and Δ ω (K)>0 or Δ d=Δ dmax, eP (K)≤0 and Δ ω (K)>0 o'clock, by last time control signal deduct described control signal increment and produce the 3rd control signal, at Δ d<Δ dmax, eP (K)≤0 and Δ ω (K)<0 or Δ d=Δ dmax, eP (K)≤0 and Δ ω (K)<0 o'clock, by last time control signal add the above control signal increment and produce the 4th control signal, described processor is in the pattern variable order during corresponding to constant voltage mode, according to the electric current of current sampling circuit and the sampling of the first voltage sampling circuit and the difference e P (K) of voltage calculating current power and current power and last power, DC bus-bar voltage calculated difference eV (K) according to desired voltage values and the sampling of second voltage sample circuit, eV (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eV (K)-eV (K-1))+Ki * eV (K), at eP (K)>0 o'clock, the control signal of last time is added to the above control signal increment and produces the 5th control signal, at eP (K)≤0, when eV (K)≤ε or eV (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 6th control signal, at eP (K)≤0, and eV (K)>ε and eV (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction, described processor in the pattern variable order corresponding to permanent power mode: the difference e P (K) that calculates current power P (K) and expectation power and current power according to electric current and the voltage of current sampling circuit and the sampling of the first voltage sampling circuit, eP (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eP (K)-eP (K-1))+Ki * eP (K), at P (K)-P (K-1)>0 o'clock, the control signal of last time is added to the above control signal increment and export as the 7th control signal, at P (K)-P (K-1)≤0, when eP (K)≤ε or eP (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 8th control signal, at P (K)-P (K-1)≤0, when and eP (K)>ε and eP (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction, described drive circuit amplifies and comes first of self processor to control signal to the 8th control signal, and the signal of respective transmissions after amplifying is to switching circuit and by the described first make-and-break time that controls signal to the described switching circuit of the corresponding control of the 8th control signal.
In concrete scheme, described first to control signal to the 8th control signal be respectively pwm signal, and span is between 0 to 1.
In concrete scheme, in the MPPT maximum power point tracking pattern, the span of described Kp is between 0.001 to 0.05; In constant voltage mode, between the 2%-5% that the span of described threshold value ε is the DC bus-bar voltage desired voltage values; The span of Kp is at 0.04/V
refto 1/V
refbetween, V wherein
refexpectation voltage for DC bus-bar voltage; The span of Ki is at 0.01/V
refto 0.4/V
refbetween, V wherein
refexpectation voltage for DC bus-bar voltage; In permanent power mode, between the 2%-5% of the span of described threshold value for the expectation performance number, the span of Kp is at 0.02/P
refto 0.5/P
refbetween, P wherein
reffor the expectation power output; The span of Ki is at 0.001/P
refto 0.03/P
refbetween, P wherein
reffor the expectation power output.
The present invention also discloses the control device that another kind of wind generator system accesses micro-electrical network, described wind generator system is connected in the DC bus of micro-electrical network by switching circuit, this device comprises current sampling circuit, the first voltage sampling circuit, second voltage sample circuit, processor and drive circuit, wherein, the voltage of described the first voltage sampling circuit sampling wind generator system output, described current sampling circuit and second voltage sample circuit are sampled respectively and are incorporated to the electric current of DC bus and the voltage of DC bus, described processor receives the pattern variable order from energy manager, and the different value of this pattern variable order is corresponding with MPPT maximum power point tracking pattern, constant voltage mode or permanent power mode respectively, in the pattern variable order during corresponding to the MPPT maximum power point tracking pattern, calculate current power according to electric current and the magnitude of voltage of current sampling circuit and the sampling of second voltage sample circuit, the current voltage gathered according to the first voltage sampling circuit and the number of pole-pairs of generator are calculated the generator angular velocity of rotation ω (K) of wind generator system, also calculate the difference e P (K) of current power and last power, the difference DELTA ω of current generator angular velocity of rotation and last angular velocity of rotation (K) and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d<Δ dmax, eP (K)>0 and Δ ω (K)>0 or Δ d=Δ dmax, eP (K)>0 and Δ ω (K)>0 o'clock, by last time control signal add the above control signal increment and produce the first control signal, at Δ d<Δ dmax, eP (K)>0 and Δ ω (K)≤0 or Δ d=Δ dmax, eP (K)>0 and Δ ω (K)≤0 o'clock, by last time control signal deduct described control signal increment and produce the second control signal, at Δ d<Δ dmax, eP (K)≤0 and Δ ω (K)>0 or Δ d=Δ dmax, eP (K)≤0 and Δ ω (K)>0 o'clock, by last time control signal deduct described control signal increment and produce the 3rd control signal, at Δ d<Δ dmax, eP (K)≤0 and Δ ω (K)<0 or Δ d=Δ dmax, eP (K)≤0 and Δ ω (K)<0 o'clock, by last time control signal add the above control signal increment and produce the 4th control signal, described processor is in the pattern variable order during corresponding to constant voltage mode, according to the electric current of current sampling circuit and the sampling of second voltage sample circuit and the difference e P (K) of voltage calculating current power and current power and last power, DC bus-bar voltage calculated difference eV (K) according to desired voltage values and the sampling of second voltage sample circuit, eV (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eV (K)-eV (K-1))+Ki * eV (K), at eP (K)>0 o'clock, the control signal of last time is added to the above control signal increment and produces the 5th control signal, at eP (K)≤0, when eV (K)≤ε or eV (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 6th control signal, at eP (K)≤0, and eV (K)>ε and eV (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction, described processor in the pattern variable order corresponding to permanent power mode: the difference e P (K) that calculates current power P (K) and expectation power and current power according to electric current and the voltage of current sampling circuit and the sampling of second voltage sample circuit, eP (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eP (K)-eP (K-1))+Ki * eP (K), at P (K)-P (K-1)>0 o'clock, the control signal of last time is added to the above control signal increment and export as the 7th control signal, at P (K)-P (K-1)≤0, when eP (K)≤ε or eP (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 8th control signal, at P (K)-P (K-1)≤0, when and eP (K)>ε and eP (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction, described drive circuit amplifies and comes first of self processor to control signal to the 8th control signal, and the signal of transmission after amplifying is to switching circuit and by the described first make-and-break time that controls signal to the described switching circuit of the corresponding control of the 8th control signal.
In concrete scheme, described first to control signal to the 8th control signal be respectively pwm signal, and span is between 0 to 1.
In concrete scheme, in the MPPT maximum power point tracking pattern, the span of described Kp is between 0.001 to 0.05; In constant voltage mode, between the 2%-5% that the span of described threshold value ε is the DC bus-bar voltage desired voltage values; The span of Kp is at 0.04/V
refto 1/V
refbetween, V wherein
refexpectation voltage for DC bus-bar voltage; The span of Ki is at 0.01/V
refto 0.4/V
refbetween, V wherein
refexpectation voltage for DC bus-bar voltage; In permanent power mode, between the 2%-5% of the span of described threshold value for the expectation performance number, the span of Kp is at 0.02/P
refto 0.5/P
refbetween, P wherein
reffor the expectation power output; The span of Ki is at 0.001/P
refto 0.03/P
refbetween, P wherein
reffor the expectation power output.
The present invention also discloses the control method that a kind of wind generator system accesses micro-electrical network, this wind generator system accesses micro-electrical network by switching circuit, the method comprises the steps: to receive the pattern variable order from energy manager, and the different value of this pattern variable order corresponds respectively to MPPT maximum power point tracking pattern, constant voltage mode or permanent power, in the pattern variable order during corresponding to the MPPT maximum power point tracking pattern, electric current and the magnitude of voltage of the output of sampling wind generator system calculate current power, calculate the generator angular velocity of rotation ω (K) of wind generator system according to the number of pole-pairs of the current voltage gathered and generator, also calculate the difference e P (K) of current power and last power, the difference DELTA ω of current generator angular velocity of rotation and last angular velocity of rotation (K) and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d<Δ dmax and eP (K)>0 and Δ ω (K)>0 or Δ d=Δ dmax and eP (K)>0 and Δ ω (K)>0 o'clock, by last time control signal add the above control signal increment and produce the first control signal, at Δ d<Δ dmax and eP (K)>0 and Δ ω (K)≤0 or Δ d=Δ dmax and eP (K)>0 and Δ ω (K)≤0 o'clock, by last time control signal deduct described control signal increment and produce the second control signal, at Δ d<Δ dmax and eP (K)≤0 and Δ ω (K)>0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K)>0 o'clock, by last time control signal deduct described control signal increment and produce the 3rd control signal, at Δ d<Δ dmax and eP (K)≤0 and Δ ω (K)<0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K)<0 o'clock, by last time control signal add the above control signal increment and produce the 4th control signal, in the value of pattern variable order during corresponding to constant voltage mode, the voltage of the electric current of sampling wind generator system output and the DC bus of micro-electrical network, according to the electric current of sampling and the difference e P (K) of voltage calculating current power and current power and last power, DC bus-bar voltage calculated difference eV (K) according to desired voltage values and sampling, eV (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eV (K)-eV (K-1))+Ki * eV (K), at eP (K)>0 o'clock, the control signal of last time is added to the above control signal increment and produces the 5th control signal, at eP (K)≤0, when eV (K)≤ε or eV (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 6th control signal, at eP (K)≤0, and eV (K)>ε and eV (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction, in the value of pattern variable order corresponding to permanent power mode: the voltage of the electric current of sampling wind generator system output and the DC bus of micro-electrical network, according to the electric current of sampling and the difference e P (K) of voltage calculating current power P (K) and expectation power and current power, eP (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eP (K)-eP (K-1))+Ki * eP (K), at P (K)-P (K-1)>0 o'clock, the control signal of last time is added to the above control signal increment and export as the 7th control signal, when P (K)-P (K-1)≤0 and eP (K)≤ε or eP (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 8th control signal, when P (K)-P (K-1)≤0 and eP (K)>ε and eP (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction, control signal to the 8th control signal by above-mentioned first and transfer to described switching circuit and the conducting of control switch circuit.
In a kind of specific embodiment, described first to control signal to the 8th control signal be respectively pwm signal, and span is between 0 to 1.
In a kind of specific embodiment, in the MPPT maximum power point tracking pattern, the span of described Kp is between 0.001 to 0.05; In constant voltage mode, between the 2%-5% that the span of described threshold value ε is the DC bus-bar voltage desired voltage values; The span of Kp is at 0.04/V
refto 1/V
refbetween, V wherein
refexpectation voltage for DC bus-bar voltage; The span of Ki is at 0.01/V
refto 0.4/V
refbetween, V wherein
refexpectation voltage for DC bus-bar voltage; In permanent power mode, between the 2%-5% of the span of described threshold value for the expectation performance number, the span of Kp is at 0.02/P
refto 0.5/P
refbetween, P wherein
reffor the expectation power output; The span of Ki is at 0.001/P
refto 0.03/P
refbetween, P wherein
reffor the expectation power output.
Compared with prior art, the present invention has the following advantages:
Because the control device of wind generator system of the present invention access DC micro-electric net can be according to the different value of the pattern variable order from energy manager corresponding to different mode of operations, the corresponding control algolithm of operation under different working modes, thereby, make wind generator system can be input to according to the energy requirement adjustment of DC micro-electric net the energy of DC micro-electric net, (such as, and according to the power difference, the mode of voltage difference and so on is adjusted and is produced corresponding control signal or pattern switching), thereby, can be operated in the MPPT maximum power point tracking pattern, constant voltage mode or permanent power mode, like this, adjust the input of DC micro-electric net according to the energy requirement of DC micro-electric net, make wind generator system controlled, contribute to realize the stable operation of whole DC micro-electric net, in addition, because power output, power difference and voltage difference of considering wind generator system and so on are realized controlling, so control precision is very high, reliability is also high, and capacity usage ratio is also high.
The accompanying drawing explanation
Fig. 1 is the theory diagram of control device the first execution mode of wind generator system access DC micro-electric net of the present invention;
Fig. 2 is the flow chart of the control device of wind generator system of the present invention access DC micro-electric net while working in the MPPT maximum power point tracking pattern;
Fig. 3 is the flow chart of the control device of wind generator system of the present invention access DC micro-electric net while working in constant voltage mode;
Fig. 4 is the flow chart of the control device of wind generator system of the present invention access DC micro-electric net while working in permanent power mode;
Fig. 5 is the theory diagram of control device second execution mode of wind generator system access DC micro-electric net of the present invention.
Embodiment
By describing technology contents of the present invention, structural feature in detail, being reached purpose and effect, below in conjunction with embodiment and coordinate accompanying drawing to be described in detail.
Refer to Fig. 1, the control device of wind generator system access DC micro-electric net of the present invention comprises current sampling circuit 1, the first voltage sampling circuit 2, second voltage sample circuit 3, processor 4 and drive circuit 5.Described wind generator system is connected in the DC bus of DC micro-electric net by switching circuit.In the present embodiment, described switching circuit consists of uncontrollable rectification circuit and DC/DC converter, also can adopt other modes, as long as can realize reaching make-and-break time by controlling this switching circuit, control inputs is to the purpose of the electric energy time of micro-electrical network.Described current sampling circuit 1 and the first voltage sampling circuit 2 sample respectively electric current and the voltage of wind generator system output, in the present embodiment, be the electric current of the described uncontrollable rectification circuit output of sampling, the electric current of transmission sampling and magnitude of voltage are to described processor 4.The voltage of described second voltage sample circuit 3 sampling DC buss, the voltage of transmission sampling is to processor 4.
Please continue to consult Fig. 1, the pattern variable order that described processor 4 receives from energy manager, the different value of this pattern variable order is corresponding with MPPT maximum power point tracking pattern, constant voltage mode or permanent power mode respectively, such as, the value of the pattern variable order that the MPPT maximum power point tracking pattern is corresponding is 1, the value of the pattern variable order that constant voltage mode is corresponding is 2, and the value of the pattern variable order that permanent power mode is corresponding is 3.How energy manager produces the pattern variable order belongs to prior art, does not repeat them here.The pattern variable that energy manager produces can transfer to processor 4 so that processor 4 can receive the pattern variable order from energy manager by GPRS network, Ethernet or RS485 communication mode.
Refer to Fig. 1 and Fig. 2, this processor 4 is in the value of pattern variable instruction during corresponding to the MPPT maximum power point tracking pattern, the electric current of processor 4 received current sample circuit 1 samplings and the voltage of the first voltage sampling circuit 2 samplings, calculate current power P (K) according to the electric current of current sampling circuit 1 sampling and the voltage of the first voltage sampling circuit 2 samplings, calculate the generator angular velocity of rotation ω (K) of wind generator system according to the voltage of the first voltage sampling circuit 2 samplings, also calculate current power P (K) and the difference e P (K) of last power P (K-1) and difference DELTA ω (K) and control signal increment Delta d=Kp|eP (the K)/Δ ω (K) of current generator angular velocity of rotation ω (K) and last angular velocity of rotation ω (K-1) |, at Δ d<Δ dmax and eP (K)>0 and Δ ω (K)>0 or Δ d=Δ dmax and eP (K)>0 and Δ ω (K)>0 o'clock, by last time control signal add the above control signal increment and produce the first control signal, at Δ d<Δ dmax and eP (K)>0 and Δ ω (K)≤0 or Δ d=Δ dmax and eP (K)>0 and Δ ω (K)≤0 o'clock, by last time control signal deduct described control signal increment and produce the second control signal, at Δ d<Δ dmax and eP (K)≤0 and Δ ω (K)>0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K)>0 o'clock, by last time control signal deduct described control signal increment and produce the 3rd control signal, at Δ d<Δ dmax and eP (K)≤0 and Δ ω (K)<0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K)<0 o'clock, by last time control signal add the above control signal increment and produce the 4th control signal.The span of described COEFFICIENT K p is between 0.001 to 0.05, such as, think | eP (K)/Δ ω (K) |<5 near maximum power point, the span of Kp is chosen as between 0.0002 to 0.002, make step-length in the maximum power point vicinity between 0.001 to 0.01, and control signal increment Delta d is carried out to amplitude limit, maximum is chosen as 0.1, carries out afterwards climbing method.Described first to control signal to the 4th control signal be respectively pwm signal, and the duty ratio of pwm signal and described control signal are linear and reach the purpose of adjusting make-and-break time.In the present embodiment, Kp<0.001 o'clock, can make the speed of system keeps track maximum power point slow, and Kp>0.05 o'clock makes near concussion maximum power point strengthen, and all can make the deleterious of MPPT maximum power point tracking.
Please continue to consult Fig. 1 and Fig. 3, described processor 4 is in the value of pattern variable order during corresponding to constant voltage mode, electric current and the voltage of processor 4 received current sample circuits 1 and the first voltage sampling circuit 2 sampling wind generator system outputs, calculate current power P (K) according to this current value and magnitude of voltage.Also receive the voltage V (K) of DC bus of micro-electrical network of the second sample circuit 3 sampling, calculate the difference e V (K) of the difference e P (K) of current power P (K) and last power P (K-1) and desired voltage values Vref (K) and the voltage V (K) of the DC bus of sampling.EV (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eV (K)-eV (K-1))+Ki * eV (K).At eP (K)>0 o'clock, the control signal of last time is added to the above control signal increment and produces the 5th control signal.When eP (K)≤0 and eV (K)≤ε or eP (K)≤0 and eV (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 6th control signal.At eP (K)≤0 and eV (K)>ε and eV (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction, concrete, pattern variable revision instruction is sent to energy manager, energy manager is revised as 1 according to this instruction by the present mode variable, like this, whole control device just is operated in the MPPT maximum power point tracking pattern.In the present embodiment, the span of threshold value ε is between 2%～5%, such as 3%, 4% etc. of, DC bus-bar voltage desired value.In the present embodiment, the span of Kp is at 0.04/V
refto 1/V
refbetween, V wherein
reffor the expectation voltage of DC bus-bar voltage, Kp>1/V
refcan make overshoot increase, stability of a system variation, Kp>0.04/V
refthe time, system keeps track speed is slow, and control precision is poor; The span of Ki is at 0.01/V
refto 0.4/V
refbetween, V wherein
reffor the expectation voltage of DC bus-bar voltage, Ki>0.4/V
refthere will be the integration saturated phenomenon, poor system performance, Ki<0.01/V
refthere is steady-state error in too small telephone system.
Refer to Fig. 1 and Fig. 4, described processor is when the corresponding permanent power mode of pattern variable order, calculate current power P (K) according to the electric current of current sampling circuit 1 sampling wind generator system output and the voltage of the first voltage sampling circuit 2 samplings, the difference e P of calculation expectation power and current power (K) also, eP (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eP (K)-eP (K-1))+Ki * eP (K), at P (K)-P (K-1)>0 o'clock, the control signal of last time is added to the above control signal increment to be exported as the 7th control signal, when P (K)-P (K-1)≤0 and eP (K)≤threshold value ε or P (K)-P (K-1)≤0 and eP (K-1)≤threshold value ε, the control signal of last time is added to the above control signal increment and export as the 8th control signal, when P (K)-P (K-1)≤0 and eP (K)>threshold value ε and eP (K-1)>threshold value ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction, in the present embodiment, described threshold value ε is 2%～5% of expectation performance number, such as 3%, 4% etc.The span of the COEFFICIENT K p that described PID controls is at 0.02/P
refto 0.5/P
refbetween, P wherein
reffor the expectation power output, the excessive words of Kp can make overshoot increase, stability of a system variation, and too small telephone system tracking velocity is slow, and control precision is poor; The span of Ki is at 0.001/P
refto 0.03/P
refbetween, P wherein
reffor the expectation power output, the excessive words of Ki there will be the integration saturated phenomenon, poor system performance, and there is steady-state error in too small telephone system.
Please continue to consult Fig. 1, described first to control signal to the 8th control signal be respectively pwm signal, and span, between 0 to 1, if be greater than 1,, can adopt amplitude limiting processing and make amplitude in above-mentioned scope.The ON time of the duty ratio of this pwm signal and DC/DC converter is linear, like this, can reach by controlling duty ratio the purpose of controlling ON time, because, between blower fan power output and wind wheel angular speed in relation curve, the problem that an efficiency is arranged in electrical power and mechanical output, simply dealt words also can think that both equate.Under a definite wind speed, there is the wind wheel angular speed an of the best, for the directly-driven wind machine, because wind wheel coaxially directly is connected with wind-driven generator, non-gear box, so speed is also the angular velocity of rotation of wind-driven generator.By controlling the duty ratio of DC/DC converter, regulate the output current of wind-driven generator, reach the purpose that changes the wind-driven generator load, thereby make its angular velocity of rotation reach optimum angle speed, the wind-driven generator Maximum Power Output.5 pairs corresponding first of described drive circuits control signal to the 8th control signal and are amplified and transmit signal after amplifying to the DC/DC converter and by the described first make-and-break time that controls signal to the corresponding control of the 8th control signal DC/DC converter, it should be explicitly made clear at this point, in the present invention, first controls signal in the 8th control signal, sometime, processor only produces in above-mentioned eight control signals according to actual conditions, such as: when processor 4 transmission first control signal to drive circuit 5, drive circuit 5 amplifies this first control signal, this first control signal makes the ON time of DC/DC converter increase, because ON time increases, so, wind generator system can transmit more energy to micro-some net of direct current, and then, regulate the output current of wind-driven generator, reach the purpose that changes the wind-driven generator load.
In the above-described embodiment, to obtain current power by current sampling circuit and the first voltage sampling circuit, that is to say, it is the power output that gathers wind generator system, in other mode, also can gather the electric current that is incorporated to the DC micro-electric net and DC bus-bar voltage and obtain current power, the specific implementation of this kind of mode is, incoming end at DC bus arranges current sampling circuit, by the current sampling circuit acquisition current power of second voltage sample circuit and setting.Take such technical thought as basis, the present invention also provides the control device of the second execution mode, as shown in Figure 5, this device comprises current sampling circuit 1, the first voltage sampling circuit 2, second voltage sample circuit 3, processor 4 and drive circuit 5, wherein, the voltage of described the first voltage sampling circuit sampling wind generator system output; Described current sampling circuit and second voltage sample circuit are sampled respectively and are incorporated to the electric current of DC bus and the voltage of DC bus.Described processor receives the pattern variable order from energy manager, and the different value of this pattern variable order is corresponding with MPPT maximum power point tracking pattern, constant voltage mode or permanent power mode respectively, in the pattern variable order during corresponding to the MPPT maximum power point tracking pattern, calculate current power according to electric current and the magnitude of voltage of current sampling circuit and the sampling of second voltage sample circuit, the current voltage gathered according to the first voltage sampling circuit and the number of pole-pairs of generator are calculated the generator angular velocity of rotation ω (K) of wind generator system, also calculate the difference e P (K) of current power and last power, the difference DELTA ω of current generator angular velocity of rotation and last angular velocity of rotation (K) and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d<Δ dmax, eP (K)>0 and Δ ω (K)>0 or Δ d=Δ dmax, eP (K)>0 and Δ ω (K)>0 o'clock, by last time control signal add the above control signal increment and produce the first control signal, at Δ d<Δ dmax, eP (K)>0 and Δ ω (K)≤0 or Δ d=Δ dmax, eP (K)>0 and Δ ω (K)≤0 o'clock, by last time control signal deduct described control signal increment and produce the second control signal, at Δ d<Δ dmax, eP (K)≤0 and Δ ω (K)>0 or Δ d=Δ dmax, eP (K)≤0 and Δ ω (K)>0 o'clock, by last time control signal deduct described control signal increment and produce the 3rd control signal, at Δ d<Δ dmax, eP (K)≤0 and Δ ω (K)<0 or Δ d=Δ dmax, eP (K)≤0 and Δ ω (K)<0 o'clock, by last time control signal add the above control signal increment and produce the 4th control signal, described processor is in the pattern variable order during corresponding to constant voltage mode, according to the electric current of current sampling circuit and the sampling of second voltage sample circuit and the difference e P (K) of voltage calculating current power and current power and last power, DC bus-bar voltage calculated difference eV (K) according to desired voltage values and the sampling of second voltage sample circuit, eV (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eV (K)-eV (K-1))+Ki * eV (K), at eP (K)>0 o'clock, the control signal of last time is added to the above control signal increment and produces the 5th control signal, at eP (K)≤0, when eV (K)≤ε or eV (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 6th control signal, at eP (K)≤0, and eV (K)>ε and eV (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction, described processor in the pattern variable order corresponding to permanent power mode: the difference e P (K) that calculates current power P (K) and expectation power and current power according to electric current and the voltage of current sampling circuit and the sampling of second voltage sample circuit, eP (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eP (K)-eP (K-1))+Ki * eP (K), at P (K)-P (K-1)>0 o'clock, the control signal of last time is added to the above control signal increment and export as the 7th control signal, at P (K)-P (K-1)≤0, when eP (K)≤ε or eP (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 8th control signal, at P (K)-P (K-1)≤0, when and eP (K)>ε and eP (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction, described drive circuit amplifies and comes first of self processor to control signal to the 8th control signal, and the signal of transmission after amplifying is to switching circuit and by the described first make-and-break time that controls signal to the described switching circuit of the corresponding control of the 8th control signal.
Take above-mentioned technical thought as basis, the present invention also discloses the present invention and also discloses the control method that a kind of wind generator system accesses micro-electrical network, this wind generator system accesses micro-electrical network by switching circuit, the method comprises the steps: to receive the pattern variable order from energy manager, and the different value of this pattern variable order corresponds respectively to MPPT maximum power point tracking pattern, constant voltage mode or permanent power mode, in the pattern variable order during corresponding to the MPPT maximum power point tracking pattern, electric current and the magnitude of voltage of the output of sampling wind generator system calculate current power, calculate the generator angular velocity of rotation ω (K) of wind generator system according to the number of pole-pairs of the current voltage gathered and generator, also calculate the difference e P (K) of current power and last power, the difference DELTA ω of current generator angular velocity of rotation and last angular velocity of rotation (K) and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d<Δ dmax and eP (K)>0 and Δ ω (K)>0 or Δ d=Δ dmax and eP (K)>0 and Δ ω (K)>0 o'clock, by last time control signal add the above control signal increment and produce the first control signal, at Δ d<Δ dmax and eP (K)>0 and Δ ω (K)≤0 or Δ d=Δ dmax and eP (K)>0 and Δ ω (K)≤0 o'clock, by last time control signal deduct described control signal increment and produce the second control signal, at Δ d<Δ dmax and eP (K)≤0 and Δ ω (K)>0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K)>0 o'clock, by last time control signal deduct described control signal increment and produce the 3rd control signal, at Δ d<Δ dmax and eP (K)≤0 and Δ ω (K)<0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K)<0 o'clock, by last time control signal add the above control signal increment and produce the 4th control signal, in the MPPT maximum power point tracking pattern, the span of described Kp is between 0.001 to 0.05, in the value of pattern variable order during corresponding to constant voltage mode, the voltage of the electric current of sampling wind generator system output and the DC bus of micro-electrical network, according to the electric current of sampling and the difference e P (K) of voltage calculating current power and current power and last power, DC bus-bar voltage calculated difference eV (K) according to desired voltage values and sampling, eV (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eV (K)-eV (K-1))+Ki * eV (K), at eP (K)>0 o'clock, the control signal of last time is added to the above control signal increment and produces the 5th control signal, at eP (K)≤0, when eV (K)≤ε or eV (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 6th control signal, at eP (K)≤0, and eV (K)>ε and eV (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction, in constant voltage mode, between the 2%-5% that the span of described threshold value ε is the DC bus-bar voltage desired voltage values, the span of Kp is at 0.04/V
refto 1/V
refbetween, V wherein
refexpectation voltage for DC bus-bar voltage, the span of Ki is at 0.01/V
refto 0.4/V
refbetween, V wherein
refexpectation voltage for DC bus-bar voltage, in the value of pattern variable order corresponding to permanent power mode: the voltage of the electric current of sampling wind generator system output and the DC bus of micro-electrical network, according to the electric current of sampling and the difference e P (K) of voltage calculating current power P (K) and expectation power and current power, eP (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eP (K)-eP (K-1))+Ki * eP (K), at P (K)-P (K-1)>0 o'clock, the control signal of last time is added to the above control signal increment and export as the 7th control signal, when P (K)-P (K-1)≤0 and eP (K)≤ε or eP (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 8th control signal, when P (K)-P (K-1)≤0 and eP (K)>ε and eP (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction, in permanent power mode, between the 2%-5% of the span of described threshold value for the expectation performance number, the span of Kp is at 0.02/P
refto 0.5/P
refbetween, P wherein
reffor the expectation power output, the span of Ki is at 0.001/P
refto 0.03/P
refbetween, P wherein
reffor the expectation power output, control signal to the 8th control signal by above-mentioned first and transfer to described switching circuit and the conducting of control switch circuit.Described first to control signal to the 8th control signal be respectively pwm signal, and span is between 0 to 1.
In sum, because this control device can be according to the different value of the pattern variable order from energy manager corresponding to different mode of operations, and adjust and produce corresponding control signal or pattern switching according to the mode of power difference, voltage difference and so on, thereby, can be operated in MPPT maximum power point tracking pattern, constant voltage mode or permanent power mode, like this, adjust the input of DC micro-electric net according to the energy requirement of DC micro-electric net, make wind generator system controlled, contribute to realize the stable operation of whole DC micro-electric net; In addition, because power output, power difference and voltage difference of considering wind generator system and so on are realized controlling, so control precision is very high, reliability is also high, and capacity usage ratio is also high.
Claims (9)
1. wind generator system accesses the control device of micro-electrical network, described wind generator system is connected in micro-electrical network by switching circuit, it is characterized in that: this device comprises current sampling circuit, the first voltage sampling circuit, second voltage sample circuit, processor and drive circuit, wherein
Described current sampling circuit and the first voltage sampling circuit sample respectively electric current and the voltage of wind generator system output;
The voltage of described second voltage sample circuit sampling DC bus;
Described processor receives the pattern variable order from energy manager, and the different value of this pattern variable order is corresponding with MPPT maximum power point tracking pattern, constant voltage mode or permanent power mode respectively, in the pattern variable order during corresponding to the MPPT maximum power point tracking pattern, calculate current power according to electric current and the magnitude of voltage of current sampling circuit and the sampling of the first voltage sampling circuit, the current voltage gathered according to the first voltage sampling circuit and the number of pole-pairs of generator are calculated the generator angular velocity of rotation ω (K) of wind generator system, also calculate the difference e P (K) of current power and last power, the difference DELTA ω of current generator angular velocity of rotation and last angular velocity of rotation (K) and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d<Δ dmax and eP (K)>0 and Δ ω (K)>0 or Δ d=Δ dmax and eP (K)>0 and Δ ω (K)>0 o'clock, by last time control signal add the above control signal increment and produce the first control signal, at Δ d<Δ dmax and eP (K)>0 and Δ ω (K)≤0 or Δ d=Δ dmax and eP (K)>0 and Δ ω (K)≤0 o'clock, by last time control signal deduct described control signal increment and produce the second control signal, at Δ d<Δ dmax and eP (K)≤0 and Δ ω (K)>0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K)>0 o'clock, by last time control signal deduct described control signal increment and produce the 3rd control signal, at Δ d<Δ dmax and eP (K)≤0 and Δ ω (K)<0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K)<0 o'clock, by last time control signal add the above control signal increment and produce the 4th control signal,
Described processor is in the pattern variable order during corresponding to constant voltage mode, according to the electric current of current sampling circuit and the sampling of the first voltage sampling circuit and the difference e P (K) of voltage calculating current power and current power and last power, DC bus-bar voltage calculated difference eV (K) according to desired voltage values and the sampling of second voltage sample circuit, eV (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eV (K)-eV (K-1))+Ki * eV (K), at eP (K)>0 o'clock, the control signal of last time is added to the above control signal increment and produces the 5th control signal, when eP (K)≤0 and eV (K)≤ε or eP (K)≤0 and eV (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 6th control signal, at eP (K)≤0 and eV (K)>ε and eV (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction,
Described processor in the pattern variable order corresponding to permanent power mode: the difference e P (K) that calculates current power P (K) and expectation power and current power according to electric current and the voltage of current sampling circuit and the sampling of the first voltage sampling circuit, eP (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eP (K)-eP (K-1))+Ki * eP (K), at P (K)-P (K-1)>0 o'clock, the control signal of last time is added to the above control signal increment and export as the 7th control signal; At P (K)-P (K-1)≤0, when eP (K)≤ε or eP (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 8th control signal; At P (K)-P (K-1)≤0, when and eP (K)>ε and eP (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction;
Described drive circuit amplifies and comes first of self processor to control signal to the 8th control signal, and the signal of respective transmissions after amplifying is to switching circuit and by the described first make-and-break time that controls signal to the described switching circuit of the corresponding control of the 8th control signal.
2. wind generator system according to claim 1 accesses the control device of micro-electrical network, it is characterized in that: described first to control signal to the 8th control signal be respectively pwm signal, and span is between 0 to 1.
3. wind generator system according to claim 1 accesses the control device of micro-electrical network, it is characterized in that: in the MPPT maximum power point tracking pattern, the span of described Kp is between 0.001 to 0.05; In constant voltage mode, between the 2%-5% that the span of described threshold value ε is the DC bus-bar voltage desired voltage values; The span of Kp is at 0.04/V
refto 1/V
refbetween, V wherein
refexpectation voltage for DC bus-bar voltage; The span of Ki is at 0.01/V
refto 0.4/V
refbetween, V wherein
refexpectation voltage for DC bus-bar voltage; In permanent power mode, between the 2%-5% of the span of described threshold value for the expectation performance number, the span of Kp is at 0.02/P
refto 0.5/P
refbetween, P wherein
reffor the expectation power output; The span of Ki is at 0.001/P
refto 0.03/P
refbetween, P wherein
reffor the expectation power output.
4. wind generator system accesses the control device of micro-electrical network, described wind generator system is connected in the DC bus of micro-electrical network by switching circuit, it is characterized in that: this device comprises current sampling circuit, the first voltage sampling circuit, second voltage sample circuit, processor and drive circuit, wherein
The voltage of described the first voltage sampling circuit sampling wind generator system output;
Described current sampling circuit and second voltage sample circuit are sampled respectively and are incorporated to the electric current of DC bus and the voltage of DC bus;
Described processor receives the pattern variable order from energy manager, and the different value of this pattern variable order is corresponding with MPPT maximum power point tracking pattern, constant voltage mode or permanent power mode respectively, in the value of pattern variable order during corresponding to the MPPT maximum power point tracking pattern, calculate current power according to electric current and the magnitude of voltage of current sampling circuit and the sampling of second voltage sample circuit, the current voltage gathered according to the first voltage sampling circuit and the number of pole-pairs of generator are calculated the generator angular velocity of rotation ω (K) of wind generator system, also calculate the difference e P (K) of current power and last power, the difference DELTA ω of current generator angular velocity of rotation and last angular velocity of rotation (K) and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d<Δ dmax, eP (K)>0 and Δ ω (K)>0 or Δ d=Δ dmax, eP (K)>0 and Δ ω (K)>0 o'clock, by last time control signal add the above control signal increment and produce the first control signal, at Δ d<Δ dmax, eP (K)>0 and Δ ω (K)≤0 or Δ d=Δ dmax, eP (K)>0 and Δ ω (K)≤0 o'clock, by last time control signal deduct described control signal increment and produce the second control signal, at Δ d<Δ dmax, eP (K)≤0 and Δ ω (K)>0 or Δ d=Δ dmax, eP (K)≤0 and Δ ω (K)>0 o'clock, by last time control signal deduct described control signal increment and produce the 3rd control signal, at Δ d<Δ dmax, eP (K)≤0 and Δ ω (K)<0 or Δ d=Δ dmax, eP (K)≤0 and Δ ω (K)<0 o'clock, by last time control signal add the above control signal increment and produce the 4th control signal,
Described processor is in the value of pattern variable order during corresponding to constant voltage mode, according to the electric current of current sampling circuit and the sampling of second voltage sample circuit and the difference e P (K) of voltage calculating current power and current power and last power, DC bus-bar voltage calculated difference eV (K) according to desired voltage values and the sampling of second voltage sample circuit, eV (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eV (K)-eV (K-1))+Ki * eV (K), at eP (K)>0 o'clock, the control signal of last time is added to the above control signal increment and produces the 5th control signal, at eP (K)≤0, when eV (K)≤ε or eV (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 6th control signal, at eP (K)≤0, and eV (K)>ε and eV (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction,
Described processor in the value of pattern variable order corresponding to permanent power mode: the difference e P (K) that calculates current power P (K) and expectation power and current power according to electric current and the voltage of current sampling circuit and the sampling of second voltage sample circuit, eP (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eP (K)-eP (K-1))+Ki * eP (K), at P (K)-P (K-1)>0 o'clock, the control signal of last time is added to the above control signal increment and export as the 7th control signal; When P (K)-P (K-1)≤0 and eP (K)≤ε or eP (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 8th control signal; When P (K)-P (K-1)≤0 and eP (K)>ε and eP (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction;
Described drive circuit amplifies and comes first of self processor to control signal to the 8th control signal, and the signal of transmission after amplifying is to switching circuit and by the described first make-and-break time that controls signal to the described switching circuit of the corresponding control of the 8th control signal.
5. wind generator system according to claim 4 accesses the control device of micro-electrical network, it is characterized in that: described first to control signal to the 8th control signal be respectively pwm signal, and span is between 0 to 1.
6. wind generator system according to claim 4 accesses the control device of micro-electrical network, it is characterized in that: in the MPPT maximum power point tracking pattern, the span of described Kp is between 0.001 to 0.05; In constant voltage mode, between the 2%-5% that the span of described threshold value ε is the DC bus-bar voltage desired voltage values; The span of Kp is at 0.04/V
refto 1/V
refbetween, V wherein
refexpectation voltage for DC bus-bar voltage; The span of Ki is at 0.01/V
refto 0.4/V
refbetween, V wherein
refexpectation voltage for DC bus-bar voltage; In permanent power mode, between the 2%-5% of the span of described threshold value for the expectation performance number, the span of Kp is at 0.02/P
refto 0.5/P
refbetween, P wherein
reffor the expectation power output; The span of Ki is at 0.001/P
refto 0.03/P
refbetween, P wherein
reffor the expectation power output.
7. wind generator system accesses the control method of micro-electrical network, this wind generator system accesses micro-electrical network by switching circuit, it is characterized in that: the method comprises the steps: to receive the pattern variable order from energy manager, and the different value of this pattern variable order corresponds respectively to MPPT maximum power point tracking pattern, constant voltage mode or permanent power mode;
In the pattern variable order during corresponding to the MPPT maximum power point tracking pattern, electric current and the magnitude of voltage of the output of sampling wind generator system calculate current power, calculate the generator angular velocity of rotation ω (K) of wind generator system according to the number of pole-pairs of the current voltage gathered and generator, also calculate the difference e P (K) of current power and last power, the difference DELTA ω of current generator angular velocity of rotation and last angular velocity of rotation (K) and control signal increment Delta d=Kp|eP (K)/Δ ω (K) |, at Δ d<Δ dmax and eP (K)>0 and Δ ω (K)>0 or Δ d=Δ dmax and eP (K)>0 and Δ ω (K)>0 o'clock, by last time control signal add the above control signal increment and produce the first control signal, at Δ d<Δ dmax and eP (K)>0 and Δ ω (K)≤0 or Δ d=Δ dmax and eP (K)>0 and Δ ω (K)≤0 o'clock, by last time control signal deduct described control signal increment and produce the second control signal, at Δ d<Δ dmax and eP (K)≤0 and Δ ω (K)>0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K)>0 o'clock, by last time control signal deduct described control signal increment and produce the 3rd control signal, at Δ d<Δ dmax and eP (K)≤0 and Δ ω (K)<0 or Δ d=Δ dmax and eP (K)≤0 and Δ ω (K)<0 o'clock, by last time control signal add the above control signal increment and produce the 4th control signal,
In the value of pattern variable order during corresponding to constant voltage mode, the voltage of the electric current of sampling wind generator system output and the DC bus of micro-electrical network, according to the electric current of sampling and the difference e P (K) of voltage calculating current power and current power and last power, DC bus-bar voltage calculated difference eV (K) according to desired voltage values and sampling, eV (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eV (K)-eV (K-1))+Ki * eV (K), at eP (K)>0 o'clock, the control signal of last time is added to the above control signal increment and produces the 5th control signal, at eP (K)≤0, when eV (K)≤ε or eV (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 6th control signal, at eP (K)≤0, and eV (K)>ε and eV (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction,
In the value of pattern variable order corresponding to permanent power mode: the voltage of the electric current of sampling wind generator system output and the DC bus of micro-electrical network, according to the electric current of sampling and the difference e P (K) of voltage calculating current power P (K) and expectation power and current power, eP (K) is adopted PI to control and calculates wind generator system to the control signal increment Delta d=Kp of the time of micro-electrical network input electric energy * (eP (K)-eP (K-1))+Ki * eP (K), at P (K)-P (K-1)>0 o'clock, the control signal of last time is added to the above control signal increment and export as the 7th control signal; When P (K)-P (K-1)≤0 and eP (K)≤ε or eP (K-1)≤ε, the control signal of last time is added to the above control signal increment and export as the 8th control signal; When P (K)-P (K-1)≤0 and eP (K)>ε and eP (K-1)>ε, processor produces the pattern variable modify instruction so that energy manager switches to the MPPT maximum power point tracking pattern according to this instruction;
Control signal to the 8th control signal by above-mentioned first and transfer to described switching circuit and the conducting of control switch circuit.
8. wind generator system according to claim 7 accesses the control method of micro-electrical network, it is characterized in that: described first to control signal to the 8th control signal be respectively pwm signal, and span is between 0 to 1.
9. access the control method of micro-electrical network according to the described wind generator system of claim 7 or 8, it is characterized in that: in the MPPT maximum power point tracking pattern, the span of described Kp is between 0.001 to 0.05; In constant voltage mode, between the 2%-5% that the span of described threshold value ε is the DC bus-bar voltage desired voltage values; The span of Kp is at 0.04/V
refto 1/V
refbetween, V wherein
refexpectation voltage for DC bus-bar voltage; The span of Ki is at 0.01/V
refto 0.4/V
refbetween, V wherein
refexpectation voltage for DC bus-bar voltage; In permanent power mode, between the 2%-5% of the span of described threshold value for the expectation performance number, the span of Kp is at 0.02/P
refto 0.5/P
refbetween, P wherein
reffor the expectation power output; The span of Ki is at 0.001/P
refto 0.03/P
refbetween, P wherein
reffor the expectation power output.
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| CN102931653A (en) * | 2012-11-02 | 2013-02-13 | 浙江工业大学 | Comprehensive coordination control method of wind-solar direct current micro-grid |
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| US20110199044A1 (en) * | 2006-12-22 | 2011-08-18 | Kimball Jonathan W | Modular System For Unattended Energy Generation And Storage |
| CN202586340U (en) * | 2012-05-18 | 2012-12-05 | 黄刚 | Low-voltage bipolar direct current micro-power grid system |
| CN102931683A (en) * | 2012-11-02 | 2013-02-13 | 浙江工业大学 | Wind-solar direct current microgrid grid-connection control method based on substation typical daily load curve |
| CN102931653A (en) * | 2012-11-02 | 2013-02-13 | 浙江工业大学 | Comprehensive coordination control method of wind-solar direct current micro-grid |
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Application publication date: 20131113 Assignee: ZHEJIANG JEC NEW ENERGY TECHNOLOGY CO., LTD. Assignor: Jiaxing University Contract record no.: 2017330000087 Denomination of invention: Device and method for controlling wind turbine system to access DC (direct current) micro-grid Granted publication date: 20150930 License type: Common License Record date: 20170626 |