CN101728837B - Energy feedback system - Google Patents
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Abstract
本发明公开了能量回馈系统,该系统中的回馈接触器、滤波器、回馈器逆变桥以及防呆二极管依次连接形成回馈通路;所述回馈通路通过回馈接触器闭合实现回馈通路的接通和在回馈器故障保护时断开回馈接触器以切断所述回馈通路;回馈器外接的变频器通过回馈器中的旁路接触器从电网吸收电能;所述旁路接触器在回馈器闭合回馈接触器接通回馈通路且向电网回馈电能时断开,所述旁路接触器在回馈电能结束时闭合使变频器整流桥接通电网。本发明采用上述两个接触器相互配合的工作模式能够有效的抑制回馈器在向电网回馈电能时与变频器间产生的高频环流,有效的防止所述环流对变频器的损坏。
The invention discloses an energy feedback system. In the system, a feedback contactor, a filter, a feedback inverter bridge, and a fool-proof diode are sequentially connected to form a feedback path; the feedback path is connected and closed by the feedback contactor. When the feeder is faulty, disconnect the feeder contactor to cut off the feeder path; the inverter externally connected to the feeder absorbs power from the grid through the bypass contactor in the feeder; the bypass contactor closes the feeder contact at the feeder The bypass contactor is turned off when the feedback path is connected and the electric energy is fed back to the grid, and the bypass contactor is closed when the feedback electric energy ends so that the rectifier bridge of the frequency converter is connected to the grid. The present invention adopts the working mode in which the above two contactors cooperate with each other, which can effectively suppress the high-frequency circulating current generated between the feeder and the frequency converter when feeding back electric energy to the grid, and effectively prevent the damage to the frequency converter caused by the circulating current.
Description
技术领域: Technical field:
本发明涉及一种节能系统,特别涉及一种可用于电气拖动系统的能量回馈系统。The invention relates to an energy-saving system, in particular to an energy feedback system applicable to an electric drive system.
背景技术: Background technique:
电机拖动位能式负载往复运行时,电机会不断进入发电运行状态。针对发出的这部分电能,传统拖动系统均采用能耗制动方式将其转化成热能白白浪费掉。这种情况在电梯中尤为显得明显。电梯运行过程中当电梯轿厢在运行过程中逐步减速直至停止以到达目标层时,电梯曳引机将释放机械动能。同时电梯轿厢还是一个位能性负载,由于电梯轿厢和对重的质量差,电梯轿厢在运行时还具有机械位能。当轿厢在运行过程中制动从而释放包括位能和动能的多余机械能时,将使电梯电动机处于再生发电状态,从而将负载的多余能量“再生”成电能。所再生的电能将通过电梯的电动机和变频器转换成直流电能储存在变频器直流环节的电容中,如果不能将所储存的电能及时释放,就会发生故障,使电梯无法正常运行。When the motor drives the potential energy load to reciprocate, the motor will continuously enter the power generation operation state. For this part of the electric energy sent out, the traditional drag system adopts the energy consumption braking method to convert it into heat energy and waste it in vain. This situation is especially obvious in elevators. During the operation of the elevator, when the elevator car gradually decelerates until it stops to reach the target floor during the operation, the elevator traction machine will release the mechanical kinetic energy. At the same time, the elevator car is still a potential energy load. Due to the poor quality of the elevator car and the counterweight, the elevator car also has mechanical potential energy during operation. When the car brakes during operation to release excess mechanical energy including potential energy and kinetic energy, the elevator motor will be in a state of regenerative power generation, thereby "regenerating" the excess energy of the load into electrical energy. The regenerated electric energy will be converted into DC electric energy by the motor of the elevator and the frequency converter and stored in the capacitor of the DC link of the frequency converter. If the stored electric energy cannot be released in time, a failure will occur and the elevator cannot operate normally.
通常在变频器直流环节中接入制动单元及制动电阻,通过由此形成的耗能电路使再生电能被制动电阻以热能的形式及时消耗释放掉,从而防止变频器直流侧因再生电能过大而引起设备故障。这种处理方式就是传统中常见的能耗制动方式。Usually, the braking unit and the braking resistor are connected in the DC link of the inverter, and the regenerative electric energy is consumed and released in time by the braking resistor in the form of heat through the energy-consuming circuit thus formed, thereby preventing the DC side of the inverter from being damaged due to regenerative electric energy. If it is too large, it will cause equipment failure. This processing method is a common energy consumption braking method in the tradition.
为回收利用传统能耗制动中白白浪费掉的电能,相关技术人员将能量回馈器与变频器配合使用,回馈器可以将发出的电能几乎无损耗地回馈给电网,既达到了节能目的,又避免了传统能耗制动单元中大功率电阻的大量发热,改善了系统运行环境。但是现有技术中的回馈系统在运行时还存在以下问题:In order to recycle the wasted electric energy in traditional energy-constrained braking, relevant technical personnel use the energy feedback device together with the frequency converter. It avoids a large amount of heat generated by high-power resistors in traditional energy-consuming braking units, and improves the system operating environment. However, the feedback system in the prior art also has the following problems during operation:
(1)如图4所示,在采用PWM控制策略时,在变频器1和能量回馈器2之间将产生较大环流3,会对变频器有损坏。(1) As shown in Figure 4, when the PWM control strategy is adopted, a large circulating
(2)回馈器或变频器故障时,回馈器虽能自动停止回馈,但因不具备接触器和防呆二极管功能自检的功能,无法确保回馈器回馈通路不对变频器直流母线提供电能,因此对原有传动装置的安全运行造成潜在风险。(2) When the feedback device or the frequency converter fails, although the feedback device can automatically stop the feedback, it cannot ensure that the feedback path of the feedback device does not provide power to the DC bus of the frequency converter because it does not have the self-test function of the contactor and the fool-proof diode function. Potential risks to the safe operation of the original transmission.
发明内容: Invention content:
本发明针对上述能量回馈系统所存在的问题,而提供一种能量回馈系统,该回馈系统能够有效抑制电路中出现的环流,避免对变频器造成损坏,同时通过对接触器和防呆二极管进行功能自检来加强系统运行的可靠性和安全性。The present invention aims at the problems existing in the above-mentioned energy feedback system, and provides an energy feedback system, which can effectively suppress the circulating current in the circuit, avoid damage to the frequency converter, and at the same time perform functions on the contactor and the fool-proof diode Self-inspection to enhance the reliability and security of system operation.
为了达到上述目的,本发明采用如下的技术方案:In order to achieve the above object, the present invention adopts following technical scheme:
能量回馈系统,所述系统与变频器配合使用,其包括回馈接触器、滤波器、回馈器逆变桥以及防呆二极管,所述系统还包括旁路接触器,所述回馈接触器、滤波器、回馈器逆变桥以及防呆二极管依次连接形成回馈通路;所述回馈通路通过回馈接触器闭合实现回馈通路的接通和在回馈器故障保护时断开回馈接触器以切断所述回馈通路;所述回馈器外接的变频器通过回馈器中的旁路接触器从电网获取电能;所述旁路接触器在回馈器闭合回馈接触器接通回馈通路且向电网回馈电能时断开,所述旁路接触器在回馈电能结束时闭合使变频器整流桥接通电网。An energy feedback system, which is used in conjunction with a frequency converter, includes a feedback contactor, a filter, a feedback inverter bridge and a fool-proof diode, and the system also includes a bypass contactor, the feedback contactor, the filter , the feeder inverter bridge and the fool-proof diodes are connected in sequence to form a feedback path; the feedback path is closed by the feedback contactor to realize the connection of the feedback path and disconnect the feedback contactor to cut off the feedback path when the feedback device is faulty; The inverter externally connected to the feeder obtains electric energy from the grid through the bypass contactor in the feeder; the bypass contactor is disconnected when the feeder closes the feedback contactor to connect the feedback path and feeds back electric energy to the grid. The bypass contactor closes at the end of the feedback electric energy to connect the rectifier bridge of the frequency converter to the power grid.
所述系统中设置于回馈通路上的防呆二极管可为一个防呆二极管或者两个防呆二极管。The fool-proof diode arranged on the feedback path in the system can be one fool-proof diode or two fool-proof diodes.
所述系统还设置有功能自检模块,该模块在检测到故障时,将自动禁止系统向电网回馈电能,同时断开回馈接触器,并合上旁路接触器;使得变频器在自身能耗制动单元的配合下通过旁路接触器从电网获取电能继续工作;所述功能自检模块包括防呆二极管功能自检模块和回馈接触器功能自检模块。The system is also equipped with a functional self-check module, which will automatically prohibit the system from feeding back electric energy to the grid when a fault is detected, and at the same time disconnect the feedback contactor and close the bypass contactor; With the cooperation of the braking unit, the electric energy is obtained from the grid through the bypass contactor to continue working; the function self-inspection module includes a fool-proof diode function self-inspection module and a feedback contactor function self-inspection module.
所述防呆二极管功能自检模块通过以下方式实现自检功能:The self-inspection module of the fool-proof diode function realizes the self-inspection function in the following manner:
(401)在回馈电能的过程中,将能量回馈系统自身直流母线电压指令设置成在特定时间内高于变频器制动单元动作点电压一特定阀值;(401) In the process of feeding back electric energy, set the DC bus voltage command of the energy feedback system itself to be higher than the voltage of the braking unit of the frequency converter by a specific threshold within a specific time;
(402)若在该特定时间内能量回馈系统实际直流母线电压能达到所述电压指令值,则防呆二极管功能正常;(402) If the actual DC bus voltage of the energy feedback system can reach the voltage command value within the specific time, the fool-proof diode functions normally;
(403)若在该特定时间内能量回馈系统实际直流母线电压未能达到所述电压指令值或能量回馈系统电网侧电流超出某特定阀值,则防呆二极管功能异常,出现短路故障,将使系统停止向电网回馈电能,并断开回馈接触器。(403) If the actual DC bus voltage of the energy feedback system fails to reach the voltage command value or the grid side current of the energy feedback system exceeds a certain threshold value within the specific time, the function of the fool-proof diode is abnormal, and a short circuit fault occurs, which will cause the The system stops feeding power back to the grid and disconnects the feedback contactor.
所述回馈接触器功能自检模块通过以下方式实现自检功能:The feedback contactor function self-inspection module realizes the self-inspection function in the following manner:
(501)在变频器工作于发电运行模式时,将能量回馈系统自身直流母线电压指令设置成在特定时间内高于变频器制动单元动作点电压一特定阀值并控制回馈接触器处于断开状态,同时使系统进入向电网回馈电能的工作状态;(501) When the frequency converter is working in the power generation operation mode, set the DC bus voltage command of the energy feedback system itself to be higher than the operating point voltage of the frequency converter braking unit by a specific threshold within a specific time and control the feedback contactor to be disconnected At the same time, the system enters the working state of feeding back electric energy to the grid;
(502)在该特定时间内能量回馈系统实际直流母线电压能达到所述电压指令值或能量回馈系统电网侧电流超出某特定阀值,则表明回馈接触器出现无法正常断开的故障,将使系统停止向电网回馈电能,并断开回馈接触器;(502) If the actual DC bus voltage of the energy feedback system can reach the voltage command value or the grid side current of the energy feedback system exceeds a certain threshold within the specific time, it indicates that the feedback contactor has a fault that cannot be disconnected normally, and the The system stops feeding power back to the grid and disconnects the feedback contactor;
(503)在该特定时间内能量回馈系统实际直流母线电压未能达到所述电压指令值,则回馈接触器功能正常。(503) If the actual DC bus voltage of the energy feedback system fails to reach the voltage command value within the specific time, the feedback contactor functions normally.
所述回馈接触器功能自检模块与配置有辅助触点的回馈接触器配合,并通过以下方式实现自检功能:The feedback contactor function self-inspection module cooperates with the feedback contactor equipped with auxiliary contacts, and realizes the self-inspection function in the following way:
(601)检测分析回馈接触器上辅助触点检测到的回馈接触器当前工作状态信号;(601) Detect and analyze the current working state signal of the feedback contactor detected by the auxiliary contact on the feedback contactor;
(602)将检测到的当前工作状态信号与能量回馈系统发出的控制信号相比是否一致:若一致,回馈接触器工作正常;若不一致,表明回馈接触器出现故障。(602) Compare whether the detected current working state signal is consistent with the control signal sent by the energy feedback system: if they are consistent, the feedback contactor is working normally; if not, it indicates that the feedback contactor is faulty.
所述系统中还设置有旁路接触器功能自检模块,与其配合的旁路接触器配置有辅助触点,所述旁路接触器功能自检模块通过以下方式实现自检功能:The system is also provided with a bypass contactor function self-inspection module, and the bypass contactor matched with it is equipped with an auxiliary contact, and the bypass contactor function self-inspection module realizes the self-inspection function in the following manner:
(701)检测分析该辅助触点检测到的旁路接触器当前工作状态信号;(701) Detecting and analyzing the current working state signal of the bypass contactor detected by the auxiliary contact;
(702)将检测到的旁路接触器当前工作状态信号与能量回馈系统发出的控制信号比较是否一致,若两者一致,则表明旁路接触器工作正常;若不一致,表明旁路接触器出现故障,控制系统停止向电网回馈电能,并断开回馈接触器。(702) Compare the detected current working state signal of the bypass contactor with the control signal sent by the energy feedback system. If the two are consistent, it indicates that the bypass contactor is working normally; if not, it indicates that the bypass contactor has If there is a fault, the control system stops feeding power back to the grid and disconnects the feedback contactor.
根据上述技术方案得到的本发明采用两个接触器能够有效的抑制环流,有效的防止环流对变频器的损坏。同时采用回馈电流基于正弦波的控制策略,经滤波器滤波后,输出的电流电压谐波含量低,对电网污染小。According to the above technical solution, the present invention adopts two contactors, which can effectively suppress the circulating current and effectively prevent the circulating current from damaging the frequency converter. At the same time, the feedback current is based on the sine wave control strategy. After filtering by the filter, the output current and voltage have low harmonic content and little pollution to the power grid.
本发明还具备接触器和防呆二极管自检功能,能确保回馈通路不对变频器直流母线提供电能,避免对原有传动装置的运行造成潜在风险。The invention also has the self-checking function of the contactor and the fool-proof diode, which can ensure that the feedback path does not provide electric energy to the DC bus of the frequency converter, and avoids potential risks to the operation of the original transmission device.
本发明不仅仅可用在电梯驱动系统下,其他各种存在发电运行模式的电气拖动系统下均可应用。The present invention can be applied not only in the elevator drive system, but also in other electric drive systems with power generation operation modes.
附图说明: Description of drawings:
以下结合附图和具体实施方式来进一步说明本发明。The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
图1为本发明的主电路示意图。Fig. 1 is a schematic diagram of the main circuit of the present invention.
图2为本发明中另一主电路示意图。FIG. 2 is a schematic diagram of another main circuit in the present invention.
图3为本发明中回馈通路的电路示意图。FIG. 3 is a schematic circuit diagram of the feedback path in the present invention.
图4为现有回馈器在回馈时与变频器间产生的环流示意图。Fig. 4 is a schematic diagram of the circulating current generated between the existing feedback device and the frequency converter during the feedback.
具体实施方式: Detailed ways:
为了使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解,下面结合具体图示,进一步阐述本发明。In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.
本发明为了避免现有电能回馈系统所存在的问题,而提供如图1和2所示的新型能量回馈系统。In order to avoid the problems existing in the existing electric energy feedback system, the present invention provides a novel energy feedback system as shown in FIGS. 1 and 2 .
如图1所示,该系统100主要包括回馈接触器K1、滤波器、第一逆变桥、第一防呆二极管D1、旁路接触器K2。其中电网300通过系统100中的旁路接触器K2向变频器200中的变频器整流桥201供电,第一逆变桥101的一侧通过第一防呆二极管D1连接到变频器直流母线侧203(如图3所示),另一侧与回馈器滤波器102连接,回馈器滤波器102通过回馈接触器K1连接电网300,从而形成回馈通路。在该回馈通路上可以再增加一个第二防呆二极管D2(如图2所示),能够起到更好的保护作用;在实际应用中只采用第一防呆二极管D1、或者第二防呆二极管D2、或者同时采用两个防呆二极管都可满足功能需求。As shown in FIG. 1 , the
具体回馈通路的涉及如图3所示,该通路中回馈接触器K1,实现对整个回馈通路的接通和故障保护功能。在整个回馈系统向电网回馈电能时,回馈接触器K1闭合,接通回馈通路。相应的电能依次经过变频器直流母线侧203、第一逆变桥即回馈器逆变桥101、回馈器滤波器102及K1回送到电网300。在回馈器故障时,接触器K1断开,使上述通路断路,既可彻底切断电网经回馈器逆变桥向变频器直流母线侧供电的通路,又可避免故障进一步恶化。The specific feedback path involved is shown in Figure 3. The feedback contactor K1 in this path realizes the connection and fault protection functions of the entire feedback path. When the entire feedback system feeds back electric energy to the grid, the feedback contactor K1 is closed and the feedback path is connected. The corresponding electric energy is sent back to the
旁路接触器K2用于控制三相电网向变频器整流桥201输入侧204供电;在回馈通路向电网回馈电能时旁路接触器K2断开,可抑制环流;而在回馈结束后旁路接触器K2再闭合,电网经旁路接触器K2向变频器整流桥供电。The bypass contactor K2 is used to control the three-phase grid to supply power to the
滤波器102用于对回馈器逆变桥开关器件动作时产生的PWM电压进行滤波,减小输入到电网的PWM谐波电流。The
回馈器逆变桥101上的功率开关管VT1~VT6组成的三相桥臂,用于将直流电压逆变成交流电压。The three-phase bridge arm composed of the power switch tubes VT1 - VT6 on the
防呆二极管D1、D2分别安置在回馈器逆变桥连接变频器直流母线的P、N母线上,可用于防止P、N母线接反损坏装置。但在实际应用中D1和D2可都采用,也可以任取一个均可满足应用需求。Fool-proof diodes D1 and D2 are respectively placed on the P and N busbars of the feeder inverter bridge connected to the DC busbar of the frequency converter, which can be used to prevent the P and N busbars from being reversely connected to damage the device. However, in practical applications, both D1 and D2 can be used, or any one can be selected to meet the application requirements.
根据上述技术方案得到的能量回馈系统100与变频器整流桥201和第二逆变桥202组成的变频器200配合使用时,其具体运行过程如下:When the
在马达400电动运行时,旁路接触器K2闭合,由K2、变频器整流桥和第二逆变桥组成的电动供电通路向马达400提供电能。此时回馈器逆变桥101不工作,整个电能回馈系统处于待机状态;电网300的交流电经过旁路接触器K2向变频器整流桥201输入侧204供电,从而实现变频器100驱动马达400运行。When the
当马达400发电运行时,变频器直流母线上的电压将上升,同时与其连接回馈器直流母线上的电压Udc也会随之上升。当回馈器直流母线上的电压Udc上升至设定的阈值后,电能回馈系统100将使回馈接触器K1闭合、旁路接触器K2断开,从而接通回馈通路,断开电动供电通路。电能回馈系统100通过控制其逆变桥101工作方式使回馈器直流母线上的电压Udc控制在设定电压值上,并开始向电网300回馈电能。此时由于旁路接触器K2断开,将可避免电能回馈器系统100与变频器200整流桥201间环流的出现。在回馈电能结束后,回馈器系统将闭合K2进入待机状态。When the
在能量回馈系统检测到严重故障时,将自行禁止向电网回馈电能的功能,并断开回馈接触器K1使回馈通路彻底与电网断开,同时闭合旁路接触器K2保证变频器能够继续经旁路接触器K2从电网获取电能,维持变频器的继续可靠运行。When the energy feedback system detects a serious fault, it will automatically disable the function of feeding back electric energy to the grid, and disconnect the feedback contactor K1 to completely disconnect the feedback path from the grid. At the same time, close the bypass contactor K2 to ensure that the inverter can continue to bypass The circuit contactor K2 obtains electric energy from the grid to maintain the continuous and reliable operation of the inverter.
为了能够及时获知电能回馈系统的关键器件是否正常,进一步减少回馈器自身故障对传动系统的影响,本发明提供的能量回馈系统对防呆二极管、回馈接触器K1以及旁路接触器K2具有自检功能。相应自检功能的实现如下:In order to be able to know in time whether the key components of the power feedback system are normal, and further reduce the impact of the feedback device’s own failure on the transmission system, the energy feedback system provided by the present invention has self-checking functions for the fool-proof diode, the feedback contactor K1 and the bypass contactor K2 Function. The implementation of the corresponding self-test function is as follows:
防呆二极管自检功能:Fool-proof diode self-test function:
在不做防呆二极管功能自检情况下,在回馈运行时,回馈系统将自身直流母线电压指令设置得比变频器能耗制动单元的动作电压稍低。在做防呆二极管自检时,回馈系统在回馈过程中将自身直流母线电压指令设置得比变频器能耗制动单元的动作电压高出一定阀值,若此后回馈系统实际直流母线电压能升至该设置值,则说明防呆二极管工作正常;若电压小于或只能升至变频器制动单元动作点电压,则说明防呆二极管已短路损坏,将使系统停止向电网回馈电能,并断开回馈接触器。In the case of no self-check of the fool-proof diode function, the feedback system sets its own DC bus voltage command to be slightly lower than the action voltage of the energy-consuming braking unit of the frequency converter during the feedback operation. When doing the self-check of the fool-proof diode, the feedback system sets its own DC bus voltage command to be higher than the operating voltage of the energy-consuming braking unit of the inverter by a certain threshold during the feedback process. If the actual DC bus voltage of the feedback system can rise If the voltage reaches this set value, it means that the fool-proof diode works normally; if the voltage is lower than or can only rise to the action point voltage of the inverter braking unit, it means that the fool-proof diode has been short-circuited and damaged, which will cause the system to stop feeding back power to the grid and shut down Open the feedback contactor.
回馈接触器K1自检功能,本发明可通过以下两种方式实现:Feedback contactor K1 self-test function, the present invention can be realized in the following two ways:
(1)在回馈电能的过程中,系统向回馈器发送K1断开信号,能量回馈系统设置自身直流母线电压指令在特定时间内高于变频器制动单元动作点电压一特定阀值并控制回馈接触器使其处于断开状态,同时使系统进入向电网回馈电能的工作状态;若在该特定时间内能量回馈系统实际直流母线电压能达到所述电压指令值或能量回馈系统电网侧电流超出某特定阀值,则表明回馈接触器出现无法正常断开的故障;若在该特定时间内能量回馈系统实际直流母线电压未能达到所述电压指令值,则表明回馈接触器功能正常。(1) During the process of feeding back electric energy, the system sends a K1 disconnection signal to the feedback device, and the energy feedback system sets its own DC bus voltage command to be higher than the action point voltage of the inverter braking unit by a specific threshold within a specific time and controls the feedback The contactor keeps it in the disconnected state, and at the same time makes the system enter the working state of feeding back electric energy to the grid; if the actual DC bus voltage of the energy feedback system can reach the voltage command value or the grid side current of the energy feedback system exceeds a certain A certain threshold value indicates that the regenerative contactor cannot be normally disconnected; if the actual DC bus voltage of the energy feedback system fails to reach the voltage command value within the specified time, it indicates that the regenerative contactor is functioning normally.
(2)给回馈接触器K1配装辅助触点,利用K1辅助触点输出的信息作为反馈信号,与系统发出的回馈接触器K1控制信号进行比较。若两者信号不一致,则说明回馈接触器K1工作异常;若两者信号一致,则说明回馈接触器K1工作正常。(2) Equip the feedback contactor K1 with an auxiliary contact, use the information output by the K1 auxiliary contact as a feedback signal, and compare it with the control signal of the feedback contactor K1 sent by the system. If the two signals are inconsistent, it means that the feedback contactor K1 is working abnormally; if the two signals are consistent, it means that the feedback contactor K1 is working normally.
旁路接触器K2自检功能:Bypass contactor K2 self-test function:
给旁路接触器K2配装辅助触点,利用旁路接触器K2辅助触点输出的信息作为反馈信号,与系统发出的旁路接触器K2控制信号进行比较。若两者信号不一致,则说明旁路接触器K2工作异常;若两者信号一致,则说明旁路接触器K2工作正常。Equip the bypass contactor K2 with an auxiliary contact, use the information output by the bypass contactor K2 auxiliary contact as a feedback signal, and compare it with the control signal of the bypass contactor K2 sent by the system. If the two signals are inconsistent, it means that the bypass contactor K2 is working abnormally; if the two signals are consistent, it means that the bypass contactor K2 is working normally.
由于上述的自检功能,使得本专利提供的能量回馈系统在检测到故障时,将自动禁止自身向电网回馈电能的功能,同时断开回馈接触器,并合上旁路接触器;之后变频器在自身能耗制动单元的配合下通过旁路接触器从电网获取电能继续工作。Due to the above self-inspection function, when the energy feedback system provided by this patent detects a fault, it will automatically prohibit its own function of feeding back electric energy to the grid, and at the same time disconnect the feedback contactor and close the bypass contactor; then the inverter With the cooperation of its own energy consumption braking unit, it continues to work by obtaining electric energy from the grid through the bypass contactor.
由上述技术方案得到的本发明采用回馈电流基于正弦波的控制策略,经滤波器滤波后,输出的电流电压谐波含量低,对电网污染小。在回馈时,通过断开旁路接触器K2,可完全抑制回馈器逆变桥开关动作时带来的环流。在故障时,通过控制旁路接触器K2闭合以及回馈接触器K1断开和防呆二极管单向导通特性,使得变频器在自身能耗制动单元的配合下通过旁路接触器从电网获取电能继续工作,从而能够很好的保证回馈系统自身的故障不影响原有传动系统的继续运行以及安全性能。The present invention obtained from the above technical solution adopts a feedback current control strategy based on sine waves. After filtering by a filter, the output current and voltage have low harmonic content and little pollution to the power grid. When feeding back, by disconnecting the bypass contactor K2, the circulating current caused by the switching action of the inverter bridge of the feeder can be completely suppressed. In the event of a fault, by controlling the closing of the bypass contactor K2 and the opening of the feedback contactor K1 and the unidirectional conduction characteristics of the fool-proof diode, the inverter can obtain electric energy from the grid through the bypass contactor with the cooperation of its own energy consumption braking unit Continue to work, so as to ensure that the failure of the feedback system itself does not affect the continuous operation and safety performance of the original transmission system.
本发明还可应用于其他各种存在发电运行模式的电气拖动系统中,其具体实施的方案和运行过程如上所述,此处不加以赘述。The present invention can also be applied to various other electric drive systems with power generation operation modes, and its specific implementation scheme and operation process are as described above, and will not be repeated here.
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明精神和范围的前提下,本发明还会有各种变化和改进,这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.
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