WO2021088502A1 - 一种直流耗能装置控制系统及控制方法 - Google Patents
一种直流耗能装置控制系统及控制方法 Download PDFInfo
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- WO2021088502A1 WO2021088502A1 PCT/CN2020/113882 CN2020113882W WO2021088502A1 WO 2021088502 A1 WO2021088502 A1 WO 2021088502A1 CN 2020113882 W CN2020113882 W CN 2020113882W WO 2021088502 A1 WO2021088502 A1 WO 2021088502A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00019—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using optical means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
- Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
Definitions
- the invention belongs to the technical field of flexible direct current transmission of electric power systems, and in particular relates to a control system and a control method of a direct current energy consumption device of an offshore flexible direct current transmission system.
- the direct current energy consumption device is a vital equipment.
- DC energy consuming devices are mainly used in the application scenarios of new energy transmission through DC. If the sending end is new energy such as wind farms, when the receiving end AC system fails, because the receiving end transmits power first, the energy will accumulate on the DC side. Causes the DC voltage to rise, endangering the safe operation of the equipment.
- the energy-consuming device is installed in the receiving-end converter station, the purpose is to ensure that the energy-consuming device can be put in when the receiving-end AC fails to ensure the stable operation of the system.
- the technical solution disclosed in the document is to put an energy-consuming device on the AC side to solve the purpose of putting a braking resistor on the AC side to consume surplus power when the DC transmission line fails.
- This technical solution is feasible in onshore wind farms.
- the installation of AC energy-consuming devices at the sending end will increase the economic cost, and it is not suitable for offshore flexible DC transmission systems.
- the technical solution disclosed in the document is that the energy consuming device judges whether it is switched on and withdrawn by detecting the voltage on the DC side.
- the voltage on the DC side is higher than 1.15pu, it is switched on and when the voltage is lower than 0.9pu, it is withdrawn.
- the valve-side fault will also show that the DC side voltage is higher than 1.15pu or even higher.
- the energy-consuming device is put into operation, it will cause the energy-consuming device to work at a higher current and the energy-consuming device will use higher-grade devices. , Increased equipment investment. Therefore, it is not possible to accurately determine the fault type by relying solely on the DC voltage judgment, and may cause the device to malfunction.
- the technical solution disclosed in the document is to judge the fault type by detecting the AC and DC voltage, but the judgment of the fault type is not used for the control of the energy-consuming module, but is used for the control mode conversion of the MMC.
- the energy-consuming device itself can detect the DC bus voltage and the current of the energy-consuming branch.
- the strategy that only relied on the DC voltage to determine the DC energy input conditions is more likely to cause the wrong input of energy consumption and increase the requirements for energy-consuming equipment.
- the two information quantities of the DC bus voltage and the current of the energy-consuming branch cannot help it accurately determine the type of failure in the DC system, nor can it accurately know the surplus power that needs to be consumed. If the energy-consuming branch is allowed to accurately determine the type of failure It also calculates the surplus power. To complete this function, it is also necessary to obtain information from other parts of the flexible straightening system.
- the flexible straightening control and protection system itself can accurately determine the fault type and surplus power.
- control and protection system and the energy-consuming body control system are naturally equipped with optical fiber link channels. Based on cost considerations and engineering feasibility and ease of use considerations such as the use of the original optical fiber channel, the use of flexible DC control protection failure judgment and surplus power calculation capabilities, combined with energy-consuming equipment body control is an economically feasible and better technical solution.
- the present invention proposes a local control method for the energy consuming device after a communication failure to ensure the power transmission reliability of the flexible straight system.
- the purpose of the present invention is to provide a control system and a control method for a DC energy consumption device, which can accurately input the required energy consumption power according to adapting to different fault types and the communication status of the control system, and stably control the DC voltage during the failure period to improve The stability and reliability of the transmission system.
- the solution of the present invention is:
- a DC energy consuming device control system including a flexible DC control and protection system and an energy consuming device control system
- the flexible DC control and protection system is used to collect the AC and DC signals of the flexible DC transmission system and the operating status of the equipment, and when the AC system fails and meets the switching conditions, it sends the DC energy consumption switching instruction and surplus to the energy consuming device control system power;
- the energy consumption device control system is connected to the energy consumption device, collects the state of the energy consumption device and sends control commands to the energy consumption body as required;
- the energy-consuming device control system When the communication is normal, the energy-consuming device control system receives the DC energy-consuming input and withdrawal instructions and the surplus power value sent from the flexible DC control and protection system, and the energy-consuming device control system combines the energy-consuming device status to input the matching energy consumption power;
- the energy-consuming device control system determines whether to use the energy-consuming device according to the DC voltage and current signals collected by itself, and inputs the corresponding energy-consuming power when it needs to be used.
- the above-mentioned flexible DC control and protection system and the energy-consuming device control system communicate through optical fibers.
- the above-mentioned energy-consuming device control system is connected to the energy-consuming device through an optical fiber or a cable.
- the control method based on the control system of a DC energy consuming device as described above includes the following steps:
- Step 1 The flexible DC control and protection system collects the AC and DC signals of the flexible DC transmission system and the operating status of the equipment, and sends the DC energy consumption switching instruction and surplus power to the energy consuming device control system when the AC system fails and the switching conditions are met. ;
- Step 2 If the communication is normal, the energy-consuming device control system will input the matching energy-consuming power according to the DC energy-consuming input and withdrawal instructions and the surplus power value sent by the flexible DC control and protection system, and the energy-consuming device control system will combine with the energy-consuming device status;
- the energy-consuming device control system determines whether to put the energy-consuming device in based on the DC voltage and current signals collected by itself, and puts in the corresponding energy-consuming power when it needs to be used.
- the switching conditions are: the surplus power is greater than the first energy consumption input setting value, and the DC voltage is greater than or equal to the energy consumption input setting value for a duration of T m_set1 .
- the actual transmission power of the current station, P loss is the loss of the DC cable and the converter station.
- step 2 after the DC energy consumption device control system receives the surplus power P rest and the input instruction, it calculates the reference number of input energy consumption input as P rest /P cm , P cm is the minimum energy consumption power that can be divided, and then through real-time The difference between the bus voltage and the control voltage during the energy consumption input period can be accurately input energy consumption number and input corresponding energy consumption through proportional relationship or PI fine-tuning reference number.
- the flexible DC control and protection system After the flexible DC control and protection system detects that the fault disappears, it sends an exit instruction to the energy consuming device control system, and the energy consuming device control system controls the energy consuming device to exit energy consumption after receiving the exit instruction.
- step 2 if the communication between the flexible DC control and protection system and the energy-consuming device control system fails, when the DC voltage is greater than or equal to the second energy-consuming input set value Udc chop_set2 and after a period of time T m_set2, the energy-consuming device starts to operate, according to Udc chop_set3 ⁇ Udc chop_set2 corresponds to the corresponding relationship of 0 ⁇ N energy consumption numbers to input energy consumption, N corresponds to the rated energy consumption number, Udc chop_set3 is the energy consumption exit set value.
- step 2 if the communication between the flexible DC control and protection system and the energy consuming device control system fails, when the DC voltage is less than the energy consumption exit set value and a certain time T m_set3 has passed , the energy consuming device is exited.
- Figure 1 is a schematic diagram of a wind power transmission DC system and the fault range of the present invention
- Figure 2 is the main circuit diagram of one of the energy-consuming devices used in the DC system of wind power transmission
- FIG. 3 is a schematic diagram of the control system of the energy consuming device of the present invention.
- Fig. 4 is a control flow chart of the energy consuming device of the present invention.
- the present invention provides a DC energy consuming device control system, which includes a flexible DC control and protection system and an energy consuming device control system.
- the two communicate via optical fibers.
- the flexible DC control and protection system detects the DC voltage, AC voltage, and DC current of a converter station. , Bridge arm voltage, bridge arm current and other information, judge the system status, fault type and status, calculate the surplus power, determine the energy consumption input and send the energy consumption system to the energy consumption system.
- the flexible DC control and protection system is a control system of the entire flexible DC transmission, which is used to collect AC and DC signals of the flexible DC transmission system and the operating status of the equipment to monitor the real-time status of the entire system.
- the flexible straight control and protection system detects that the AC system is faulty, and the surplus power is detected to be greater than the set value of energy consumption power input: P rest ⁇ P chop_set1 , and the DC voltage is greater than or equal to the set value of energy consumption input 1: U dc ⁇ Udc chop_set1 and continues for a period of time T m_set1 , the flexible straight control and protection system sends the input command and the surplus power value to the energy consuming device control system.
- the DC energy consumption device control system receives P rest and the input command, it calculates the reference number of input energy consumption input as P rest /P cm , where P cm is the divisible minimum energy consumption power, and then the real-time bus voltage and consumption The difference between the control voltages during the input period can be accurately input and the corresponding energy consumption can be obtained through the proportional relationship or PI fine-tuning reference number.
- the flexible DC control and protection system detects the disappearance of the fault and sends an exit instruction to the energy consuming device. The energy consumption device exits energy consumption after receiving the exit command.
- the energy consuming device control system is connected with the energy consuming device through an optical fiber or a cable, and the energy consuming device control system collects the state of the energy consuming device and sends control commands to the energy consuming body as needed, so as to realize the monitoring and control of the energy consuming device and consume energy.
- the device control system measures the DC voltage and energy-consuming branch current.
- the flexible DC control and protection system calculates the surplus power and the DC voltage. If the surplus power is greater than the set value and the DC voltage rises, it will issue an input instruction to the energy consuming device. At the same time, the control and protection system sends the calculated surplus power or the number of sub-modules to the energy-consuming device body control system.
- the surplus power calculation formula is as follows:
- P rest is the surplus power
- P send is the current transmission power at the sending end of the DC system
- P dc is the actual transmission power at the receiving end converter station during the fault
- P loss is the DC cable and converter station losses. It is also possible to set P loss to 0, and consider the DC cable and converter station losses in the energy consumption power input setting value.
- the following table shows the DC transmission power upper limit and energy consumption switching strategy under different metallic fault types of the receiving end near-end AC system.
- the control and protection system judges that the fault disappears according to the AC system voltage, and issues an exit command to the energy consuming device to avoid failure to exit under certain conditions of energy consumption or exit by mistake.
- the DC energy dissipation device is a decentralized energy dissipation device in which power devices/modules and energy dissipation resistors are both distributed and arranged, or a hybrid energy dissipation device in which power devices/modules are distributed and energy dissipation resistors are arranged in a centralized manner.
- the control system of the energy consuming device keeps communicating with the flexible DC control and protection system at all times, and detects the communication status.
- the control scheme is:
- the energy-consuming device body controls and receives the input instruction and surplus power value of the flexible DC control and protection system. After the energy consumption is input, the energy consumption device is activated, and the number of input sub-modules is determined according to the auxiliary DC voltage of the surplus power, so as to control the DC voltage at the rated voltage or a certain voltage value to ensure the stable operation of the system.
- the energy consumption device body controls and receives the energy consumption exit instruction of the flexible DC control and protection system, and the energy consumption device reduces the number of input sub-modules at a predetermined rate until the number of input sub-modules is 0, and exits the entire energy consumption device.
- the main body control of the energy-consuming device maintains the communication with the flexible DC control and protection system at all times, and detects the communication status. When the communication fails:
- the energy-consuming device automatically enters autonomous control.
- the energy-consuming device detects the DC bus voltage.
- the control and protection device is put into operation, and the voltage is controlled between the first threshold and the second threshold.
- the threshold is greater than the DC bus voltage rating and less than the first threshold.
- the energy-consuming device body control can adopt pure proportional control or PI control.
- the receiving-end converter station restores the DC voltage control capability, and will control the DC voltage to the rated voltage, so that the DC voltage will drop below the second threshold, and the energy consuming device will automatically exit.
- this control strategy can automatically adapt to the control.
- it will give full play to the global sampling advantages of the flexible DC control protection system, accurately control energy consumption switching, stable control of DC voltage, and adopt energy consumption adaptive control when there is no communication. Strategy to achieve DC voltage control.
- a DC transmission system for wind power transmission is shown in Figure 1. It consists of an offshore wind farm, a booster station, an offshore flexible direct converter station 1, a DC cable, a DC energy consuming device 2, an onshore flexible direct converter station 3, and an onshore AC power grid. 4 components, in which the DC energy consumption device 2 is installed on the side of the land-based flexible straight converter station 3.
- the distributed energy consumption device shown in FIG. 2 is taken as an example for description.
- the energy consumption device may also be a hybrid energy consumption device in which power devices/modules are dispersedly arranged and energy dissipation resistors are centrally arranged, as shown in FIG. 2
- the DC energy consumption device is composed of multiple sub-modules 5 in series, and the basic components of each sub-module are composed of energy dissipation resistor 6, energy storage capacitor 8 and controllable device 7.
- the energy consumption is invested by controlling the conduction of controllable device 7
- the resistor absorbs power.
- FIG. 3 is a schematic diagram of the overall structure of the proposed energy consumption control system.
- the energy consumption control proposed by the present invention consists of a flexible DC control protection system and an energy consumption device control system.
- the energy consumption device control system receives the flexible DC control protection system.
- the energy-consuming device control system inputs the number of energy-consuming sub-modules equivalent to the surplus power to control the DC voltage.
- the flexible DC control and protection system determines whether the energy consumption is input and the surplus power, so as to avoid the wrong input of energy-consuming devices and accurately calculate the number of inputs to reduce DC Voltage fluctuations.
- the control method is shown in flow chart 4.
- the flexible direct control and protection system first monitors whether an AC fault occurs. The AC fault occurs by monitoring the AC voltage. If an AC fault occurs, the flexible DC control and protection system calculates the surplus power and DC voltage. If the surplus power is greater than the set value and the DC voltage is greater than the set value of energy consumption input, an input instruction is issued to the energy consumption device. At the same time, the control and protection system sends the calculated surplus power or the number of sub-modules to the energy-consuming device control system.
- the DC bus voltage control reference value is U dc_ref
- the DC rated voltage during normal operation is set to U dc_nom
- the lower limit of the DC bus voltage allowed or expected to be controlled by the system is U dcmin
- the upper limit is U dcmax
- the current DC transmission power is P dc
- the current DC voltage U dc the current measured by the energy consuming device is I cp .
- the rated number of energy consuming device sub-modules is N. Then the average voltage of the sub-module is When a sub-module is put into energy consumption, its consumption power
- the surplus power calculation formula is as follows:
- P rest is the surplus power
- P send is the transmission power at the sending end of the current DC system
- P dc is the actual transmission power at the receiving end converter station during the fault period
- P loss is the DC cable and converter station loss.
- P can also be set loss 0, consider the loss in the energy consumption power input setting value.
- the flexible straight control protection system detects an AC failure and detects that the surplus is greater than the set value of energy consumption power input, P rest ⁇ P chop_set , and the DC voltage rises (U dc ⁇ Udc chop_set1 ), the flexible straight control protects The system issues the input energy consumption instruction and sends the surplus power to the energy consumption device. After the DC energy consumption device receives the P rest and the input instruction, it calculates the number of input sub-modules P rest /P cm to obtain the basic instruction. On this basis, a fine-tuning command based on the difference between the DC voltage and the rated voltage is added, which can be proportional or PI control to obtain an accurate power command.
- the flexible DC control and protection system detects the disappearance of the fault and sends an exit instruction to the energy consuming device. After receiving the exit instruction, the energy consuming device reduces the input sub-module book at a certain rate until it is 0 and exits.
- P chop_set is set to be 0 to 0.8 times the rated power of the flexible straight
- Udc chop_set1 is set to be 1.02 to 1.5 times of the rated DC voltage
- U dcmax is 1.05 to 1.5 times the rated DC voltage
- U dcmin is 0.7 to 0.95 times the rated DC voltage.
- the energy-consuming device When the communication is interrupted, the energy-consuming device cannot accept the fault information judgment from the control and protection device. When a fault occurs, the DC voltage rises. At this time, the energy consuming device monitors the DC bus voltage U dc . When the DC voltage is higher than Udc chop_set2 and after a period of time T m_set2, the energy consuming device starts, according to the corresponding relationship between Udc chop_set3 ⁇ Udc chop_set2 corresponding to 0 ⁇ N sub-modules, of which N sub-modules The power consumption of the energy-consuming device is equal to the rated transmission power of the DC system when all put into operation.
- the above method can realize that the DC voltage is controlled between Udc chop_set3 and Udc chop_set2 during the fault.
- the fault disappears, the power transmission capacity of the receiving end DC voltage control station is restored, and the DC voltage drops.
- T m_set3 passes , the energy consuming device exits.
- Udc chop_set2 is taken as 1.02 to 1.5 times the DC rated voltage
- Udc chop_set3 is taken as 1.01 to 1.3 times the DC rated voltage
- Udc chop_set3 ⁇ Udc chop_set2 .
- T m_set1 takes 0.5ms to 500ms.
- T m_set2 takes 0.5ms to 500ms, and T m_set3 takes 0.5ms to 500ms.
Abstract
Description
Claims (10)
- 一种直流耗能装置控制系统,其特征在于:包括柔性直流控制保护系统和耗能装置控制系统;所述柔性直流控制保护系统用于采集柔性直流输电系统的交直流信号及设备运行状态,并在交流系统发生故障且满足投退条件时向耗能装置控制系统发送直流耗能投退指令和盈余功率;所述耗能装置控制系统与耗能装置连接,采集耗能装置状态并根据需要向耗能本体发送控制命令;通讯正常时,耗能装置控制系统接收来自柔性直流控制保护系统发送的直流耗能投退指令和盈余功率值,耗能装置控制系统结合耗能装置状态投入相匹配的耗能功率;通讯故障时,耗能装置控制系统根据自身采集的直流电压和电流信号决定是否投入耗能装置,并在需要投入时投入相应耗能功率。
- 如权利要求1所述的直流耗能装置控制系统,其特征在于:所述柔性直流控制保护系统和耗能装置控制系统通过光纤通讯。
- 如权利要求1所述的直流耗能装置控制系统,其特征在于:所述耗能装置控制系统通过光纤或电缆与耗能装置连接。
- 基于如权利要求1所述的一种直流耗能装置控制系统的控制方法,其特征在于包括如下步骤:步骤1,柔性直流控制保护系统采集柔性直流输电系统的交直流信号及设备运行状态,并在交流系统发生故障且满足投退条件时向耗能装置控制系统发送直流耗能投退指令和盈余功率;步骤2,若通讯正常,耗能装置控制系统根据柔性直流控制保护系统发送的直流耗能投退指令和盈余功率值,耗能装置控制系统结合耗能装置状态投入相匹配的耗能功率;若通讯故障,耗能装置控制系统根据自身采集的直流电压和电流信号决定是否投入耗能装置,并在需要投入时投入相应耗能功率。
- 如权利要求4所述的控制方法,其特征在于:所述步骤1中,投退条件是:盈余功率大于第一耗能投入设定值,且直流电压大于等于耗能投入设定值并持续时间T m_set1。
- 如权利要求4所述的控制方法,其特征在于:所述步骤1中,盈余功率计算方式为:P rest=P send-P dc-P loss,其中,P rest为盈余功率,P send为当前直流系统送端输送功率,P dc为故障期间受端换流站实际输送功率,P loss是直流电缆和换流站的损耗。
- 如权利要求4所述的控制方法,其特征在于:所述步骤2中,直流耗能装置控制系统接收到盈余功率P rest和投入指令后,计算投入耗能投入基准数目为P rest/ cm,P cm为可分割的最小耗能功率,再经过实时母线电压与耗能投入期间控制电压之差通过比例关系或者PI微调基准数目得到准确投入耗能数目投入相应耗能。
- 如权利要求4所述的控制方法,其特征在于:柔性直流控制保护系统检测到故障消失后向耗能装置控制系统发送退出指令,耗能装置控制系统接收到退出指令后控制耗能装置退出耗能。
- 如权利要求4所述的控制方法,其特征在于:所述步骤2中,若柔性直流控制保护系统与耗能装置控制系统通信故障,当直流电压大于等于第二耗能投入设定值Udc chop_set2且经过一段时间T m_set2耗能装置启动投入,按照Udc chop_set3→Udc chop_set2对应0→N个耗能数目的对应关系投入耗能,N对应额定耗能数目,Udc chop_set3为耗能退出设定值。
- 如权利要求4所述的控制方法,其特征在于:所述步骤2中,若柔性直流控制保护系统与耗能装置控制系统通信故障,当直流电压小于耗能退出设定值且经过一定时间T m_set3,退出耗能装置。
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