CN106169772A - A kind of energy feedback system based on floating gate threshold value starts control method and control system - Google Patents

Abstract

The invention discloses a kind of energy feedback system based on floating gate threshold value and start control method and control system, control method includes: S1. obtains AC network actual voltage value, direct current network actual voltage value；S2. direct current network floating voltage value and floating gate threshold value are calculated；S3. when direct current network actual voltage value is in non-Light Condition more than floating gate threshold value and electrical network, starting energy feedback system, the most not starting can feedback system；This control system includes measurement module, computing module and startup control module.The present invention has and whether can be in Light Condition by automatic decision electrical network, by arranging floating gate threshold value, can effectively solve to use and under fixing threshold value mode, cause energy feedback system error starting problem because of voltage ripple of power network, reduce unnecessary loss and energy consumption, be effectively improved the economic indicator of whole energy feedback system；And select optimal startup threshold according to net pressure practical situation, can further improve system response time, it is ensured that maximum effect can be played by feedback system.

Description

A kind of energy feedback system based on floating gate threshold value starts control method and control system

Technical field

The present invention relates to regenerated energy and can present field, particularly relate to a kind of energy feedback system based on floating gate threshold value and start control Method processed and control system.

Background technology

The urban track traffic of 21 century will be the green traffic system pursuing energy-conserving and environment-protective.In whole urban track traffic In system, the accounting of energy consumption of vehicles is typically above the 50% of whole system energy consumption, swift and violent along with urban rail transit technology Development, the research of the absorption and utilization that produce energy when city rail vehicle is braked by domestic and international each producer gets more and more.

Urban track traffic can present apparatus system circuit theory as it is shown in figure 1, the enabling gate threshold value of device, Yi Jiwen can be presented The height of pressure value is directly connected to the utilization rate of direct current net voltage.Fixing threshold value can not judge the liter of direct current network voltage Height is because train braking and produces braking energy, is also because other of AC voltage ripple of power network or direct current network Load changes and causes, and therefore using fixing threshold value to cause can feedback system error starting.The error starting of device can be led Enable feedback device directly forms circulation with commutator, causes a large amount of of energy to waste, and adds the loss of current transformer, because of This, carry out correct startup to energy feedback system and control to have great importance.

Summary of the invention

The technical problem to be solved in the present invention is that the technical problem existed for prior art, and the present invention provides one Planting can effectively solve to use and cause energy feedback system error starting problem under fixing threshold value mode because of voltage ripple of power network, minimizing sets Standby unnecessary loss and energy consumption, be effectively improved the economic indicator of whole energy feedback system, improve system response time, it is ensured that can present System plays the energy feedback system of maximum effect and starts control method and control system.

For solving above-mentioned technical problem, the technical scheme that the present invention proposes is: a kind of based on floating gate threshold value can present system System starts control method, comprises the steps:

S1. AC network actual voltage value U is obtained_abc, direct current network actual voltage value U_d；

S2. direct current network floating voltage value U is calculated_oWith floating gate threshold value U_f；

S3. as described direct current network actual voltage value U_dMore than described floating gate threshold value U_fAnd electrical network is in non-Light Condition Time, start energy feedback system, the most not starting can feedback system.

As a further improvement on the present invention, direct current network floating voltage value U in described step S2_oActual by AC network Magnitude of voltage U_abcNo-load voltage ratio conversion according to rectifier transformer draws.

As a further improvement on the present invention, the floating gate threshold value in described step S2 is calculated by formula (1):

$U_f=\frac{U_{abc}}{U_{abc1}}{U}_o+U_n-U_o---\left(1\right)$

In formula (1), U_fFor floating gate threshold value, U_abcFor AC network actual voltage value, U_abc1Empty for default AC network Carry magnitude of voltage, U_oFor direct current network floating voltage value, U_nFor default startup threshold expected value.

As a further improvement on the present invention, in described step S3, electrical network is in Light Condition and judges according to formula (2), formula (2) judge when setting up that electrical network is in Light Condition,

$|U_d-\frac{U_{abc}}{U_{abc1}}{U}_o|\≤X---\left(2\right)$

In formula (2), U_dFor direct current network actual voltage value, U_abcFor AC network actual voltage value, U_abc1For default friendship Stream electrical network floating voltage value, U_oFor direct current network floating voltage value, the zero load that X is default judges threshold value.

As a further improvement on the present invention, when the net of direct current network presses grade to be DC1500V, described default zero load Judge that the span of threshold value X is as [20,40].

As a further improvement on the present invention, after the feedback system of startup energy described in described step S3 is the time that time delay is preset Starting can feedback system.

A kind of energy feedback system based on floating gate threshold value starts control system, including:

Measurement module: be used for obtaining AC network actual voltage value U_abc, direct current network actual voltage value U_d；

Computing module: be used for calculating direct current network floating voltage value U_oWith floating gate threshold value U_f；

Start control module: for as described direct current network actual voltage value U_dMore than described floating gate threshold value U_fAnd electrical network When being in non-Light Condition, starting energy feedback system, the most not starting can feedback system.

Compared with prior art, it is an advantage of the current invention that: the present invention has and whether can be in zero load by automatic decision electrical network State, and by arranging floating gate threshold value, can effectively solve to use under fixing threshold value mode and cause because of voltage ripple of power network Energy feedback system error starting problem, reduces the unnecessary loss of equipment and energy consumption, is effectively improved the economic indicator of whole energy feedback system； Additionally by the mode of floating threshold, select optimal startup threshold according to net pressure practical situation, improve system response further Speed, it is ensured that maximum effect can be played by feedback system.

Accompanying drawing explanation

Fig. 1 is can feedback system circuit topology schematic diagram.

Fig. 2 is specific embodiment of the invention flow chart.

Fig. 3 is specific embodiment of the invention logical schematic.

Fig. 4 is specific embodiment of the invention structural representation.

Detailed description of the invention

Below in conjunction with Figure of description and concrete preferred embodiment, the invention will be further described, but the most therefore and Limit the scope of the invention.

As shown in Figures 2 and 3, the present embodiment is based on floating gate threshold value can start control method, including as follows by feedback system Step: S1. obtains AC network actual voltage value U_abc, direct current network actual voltage value U_d；S2. direct current network zero load electricity is calculated Pressure value U_oWith floating gate threshold value U_f；S3. as direct current network actual voltage value U_dMore than floating gate threshold value U_fAnd electrical network is in non-zero load During state, starting energy feedback system, the most not starting can feedback system.

In the present embodiment, direct current network floating voltage value U in step S2_oBy AC network actual voltage value U_abcAccording to The no-load voltage ratio conversion of rectifier transformer draws.Floating gate threshold value in step S2 is calculated by formula (1):

$U_f=\frac{U_{abc}}{U_{abc1}}{U}_o+U_n-U_o---\left(1\right)$

In formula (1), U_fFor floating gate threshold value, U_abcFor AC network actual voltage value, U_abc1Empty for default AC network Carry magnitude of voltage, U_oFor direct current network floating voltage value, U_nFor default startup threshold expected value.In the present embodiment, that presets opens Dynamic threshold value is the threshold value set by host computer.

In the present embodiment, in step S3, electrical network is in Light Condition and judges according to formula (2), judges electricity when formula (2) is set up Net is in Light Condition,

$|U_d-\frac{U_{abc}}{U_{abc1}}{U}_o|\≤X---\left(2\right)$

In formula (2), U_dFor direct current network actual voltage value, U_abcFor AC network actual voltage value, U_abc1For default friendship Stream electrical network floating voltage value, U_oFor direct current network floating voltage value, the zero load that X is default judges threshold value.When direct current network Net pressure grade is when being DC1500V, and the default unloaded span judging threshold value X is as [20,40].Step S3 starts and can present System is startup energy feedback system after the time that time delay is preset.In the present embodiment, delay time is set to 100 milliseconds.

In the present embodiment, verifying floating gate threshold value with an instantiation, the AC network of municipal rail train is 35kV Electrical network, i.e. U_abc=35000V, obtaining direct current network floating voltage value according to the no-load voltage ratio conversion of rectifier transformer is DC1670V, i.e. U_o=1670V, threshold value set by host computer is 1750V, i.e. U_n=1750V, direct current network is DC1500V electrical network, AC network Floating voltage value is 35.8kV, i.e. U_abc1=35800V, certainly, AC network floating voltage value can be carried out according to practical situation Adjust.Considering that the load in AC network evening on daytime is different, electrical network has ± fluctuation of 5%, substitute into formula (1), can be calculated The fluctuation range of floating gate threshold value is 1666.5≤U_f≤ 1833.5, the domain of walker of floating gate threshold value has reached 167V, can expire Foot power network fluctuation requirement, it is possible to effectively prevent the error starting of energy feedback system.

The present invention has and whether can be in Light Condition by automatic decision electrical network, and by arranging floating gate threshold value, can be effective Solve to use and cause energy feedback system error starting problem because of voltage ripple of power network under fixing threshold value mode, reduce equipment unnecessary Loss and energy consumption, be effectively improved whole can the economic indicator of feedback system；Additionally by the mode of floating threshold, according to net compacting Border situation selects optimal startup threshold, improves system response time further, it is ensured that can play maximum effect by feedback system.

As shown in Figure 4, the present embodiment is based on floating gate threshold value can feedback system startup control system include: measurement module: For obtaining AC network actual voltage value U_abc, direct current network actual voltage value U_d；Computing module: be used for calculating direct current network Floating voltage value U_oWith floating gate threshold value U_f；Start control module: for as direct current network actual voltage value U_dMore than floating threshold Value U_fAnd electrical network is when being in non-Light Condition, start can feedback system, the most not starting can feedback system.

Above-mentioned simply presently preferred embodiments of the present invention, not makees any pro forma restriction to the present invention.Although the present invention Disclosed above with preferred embodiment, but it is not limited to the present invention.Therefore, every without departing from technical solution of the present invention Content, according to the technology of the present invention essence to any simple modification made for any of the above embodiments, equivalent variations and modification, all should fall In the range of technical solution of the present invention protection.

Claims (7)

1. an energy feedback system based on floating gate threshold value starts control method, it is characterised in that comprise the steps:

S1. AC network actual voltage value U is obtained_abc, direct current network actual voltage value U_d；

S2. direct current network floating voltage value U is calculated_oWith floating gate threshold value U_f；

S3. as described direct current network actual voltage value U_dMore than described floating gate threshold value U_fAnd electrical network is when being in non-Light Condition, open Kinetic energy feedback system, the most not starting can feedback system.

Energy feedback system based on floating gate threshold value the most according to claim 1 starts control method, it is characterised in that: described Direct current network floating voltage value U in step S2_oBy AC network actual voltage value U_abcNo-load voltage ratio according to rectifier transformer converts Go out.

Energy feedback system based on floating gate threshold value the most according to claim 2 starts control method, it is characterised in that: described Floating gate threshold value in step S2 is calculated by formula (1):

$U_f=\frac{U_{abc}}{U_{abc1}}{U}_o+U_n-U_o---\left(1\right)$

In formula (1), U_fFor floating gate threshold value, U_abcFor AC network actual voltage value, U_abc1For default AC network zero load electricity Pressure value, U_oFor direct current network floating voltage value, U_nFor default startup threshold expected value.

Energy feedback system based on floating gate threshold value the most according to claim 3 starts control method, it is characterised in that: described In step S3, electrical network is in Light Condition and judges according to formula (2), judges that electrical network is in Light Condition when formula (2) is set up,

$|U_d-\frac{U_{abc}}{U_{abc1}}{U}_o|\≤X---\left(2\right)$

In formula (2), U_dFor direct current network actual voltage value, U_abcFor AC network actual voltage value, U_abc1For default alternating current Net floating voltage value, U_oFor direct current network floating voltage value, the zero load that X is default judges threshold value.

Energy feedback system based on floating gate threshold value the most according to claim 4 starts control method, it is characterised in that: when directly The net pressure grade of stream electrical network is when being DC1500V, and the described default unloaded span judging threshold value X is as [20,40].

Energy feedback system based on floating gate threshold value the most according to claim 5 starts control method, it is characterised in that: described The feedback system of startup energy described in step S3 is startup energy feedback system after the time that time delay is preset.

7. an energy feedback system based on floating gate threshold value starts control system, it is characterised in that including:

Measurement module: be used for obtaining AC network actual voltage value U_abc, direct current network actual voltage value U_d；

Computing module: be used for calculating direct current network floating voltage value U_oWith floating gate threshold value U_f；

Start control module: for as described direct current network actual voltage value U_dMore than described floating gate threshold value U_fAnd electrical network is in During non-Light Condition, starting energy feedback system, the most not starting can feedback system.