技术领域technical field
本发明涉及一种用于船舶MVDC综合电力推进系统的储能模块自动充放电方法。The invention relates to an automatic charging and discharging method for an energy storage module used in a marine MVDC comprehensive electric propulsion system.
背景技术Background technique
船舶MVDC综合电力推进系统是一个多源多负荷的独立电力系统，系统稳定运行是为用电负载提供高质量电能和系统安全运行的前提，船舶MVDC综合电力推进系统的稳定性是指系统运行过程中模块功率发生变化时，直流母线电压能够保持或恢复到允许范围、避免系统崩溃的能力。如何调控多个发电、用电模块的运行方式，协调各模块之间的能量流动以满足系统稳定运行和经济运行等目标是全电力船舶能量智能决策系统的关键功能之一，特别是系统引入了既可以作为发电模块也可以作为负载的储能模块，使得系统的情况更为复杂，引入储能模块固然能提高系统运行的稳定性和可靠性，但其核心问题是设计有效的储能模块自动充放电方法。The marine MVDC integrated electric propulsion system is an independent power system with multiple sources and multiple loads. The stable operation of the system is the premise of providing high-quality electric energy for the electric load and the safe operation of the system. The stability of the marine MVDC integrated electric propulsion system refers to the system operation process. When the power of the middle module changes, the DC bus voltage can maintain or recover to the allowable range, and the ability to avoid system collapse. How to regulate the operation mode of multiple power generation and power consumption modules, and coordinate the energy flow between modules to meet the goals of stable system operation and economic operation is one of the key functions of the all-electric ship energy intelligent decision-making system, especially the system introduces The energy storage module that can be used as a power generation module or as a load makes the situation of the system more complicated. The introduction of an energy storage module can certainly improve the stability and reliability of the system operation, but the core problem is to design an effective energy storage module that automatically charging and discharging method.
发明内容Contents of the invention
本发明的目的在于提供一种满足系统对于直流母线电压稳定性的要求的用于船舶MVDC综合电力推进系统的储能模块自动充放电方法The purpose of the present invention is to provide an automatic charging and discharging method for an energy storage module used in a ship's MVDC integrated electric propulsion system that meets the system's requirements for DC bus voltage stability
本发明的目的是这样实现的：The purpose of the present invention is achieved like this:
通过检测直流母线电压信号，根据直流母线电压阈值确定储能模块充放电的状态，实现储能模块的自动充放电功能，根据直流母线电压阈值确定储能模块充放电的状态包括：By detecting the DC bus voltage signal, the charging and discharging state of the energy storage module is determined according to the DC bus voltage threshold, and the automatic charging and discharging function of the energy storage module is realized. The charging and discharging state of the energy storage module is determined according to the DC bus voltage threshold, including:
定义直流母线电压偏差度ε：Define the DC bus voltage deviation ε:
其中，Vdc为直流母线电压测量值，为直流母线电压参考值；Among them, Vdc is the measured value of DC bus voltage, is the reference value of DC bus voltage;
根据直流母线电压性能指标的要求，以|ε|＝3％和|ε|＝5％为界限，将系统分为以下几个运行状态：According to the requirements of the DC bus voltage performance index, with |ε|=3% and |ε|=5% as the boundary, the system is divided into the following operating states:
状态1：|ε|＜3％，系统内的负载需求由各发电单元供给，在该状态下，发电管理通过协调各发电单元的输出功率维持系统内的功率平衡；State 1: |ε|<3%, the load demand in the system is supplied by each power generation unit, in this state, the power generation management maintains the power balance in the system by coordinating the output power of each power generation unit;
状态2：3％＜ε＜5％，此时表明系统中存在过剩的功率且仅依靠发电管理不足以维持直流母线电压在规定范围内，需要储能单元充电吸收过多的功率，储能管理通过监测直流母线电压Vdc的值和储能单元的荷电状态SOC，确定储能单元是否具备能力参与直流母线电压调节以及如果可以则确定储能单元的充电电流值；State 2: 3%<ε<5%, at this time It indicates that there is excess power in the system and only relying on power generation management is not enough to maintain the DC bus voltage within the specified range. The energy storage unit needs to be charged to absorb excessive power. Energy storage management monitors the value of the DC bus voltage Vdc and the energy storage unit State of charge SOC, determine whether the energy storage unit has the ability to participate in DC bus voltage regulation and if possible, determine the charging current value of the energy storage unit;
状态3：-5％＜ε＜-3％，系统中功率不足，需要储能单元放电向系统输出功率以保持直流母线电压平衡，储能管理通过监测直流母线电压Vdc的值和储能单元的荷电状态SOC，确定储能单元是否具备能力参与直流母线电压调节并确定储能单元的放电电流值；State 3: -5%<ε<-3%, Insufficient power in the system requires the energy storage unit to discharge and output power to the system to maintain the balance of the DC bus voltage. The energy storage management determines whether the energy storage unit has the capability by monitoring the value of the DC bus voltage Vdc and the state of charge SOC of the energy storage unit Participate in DC bus voltage regulation and determine the discharge current value of the energy storage unit;
状态4：|ε|＞5％，发电管理与储能管理不足以维持直流母线电压在规定范围内，通过增加或减少负载以平衡系统功率。State 4: |ε|>5%, the power generation management and energy storage management are not enough to maintain the DC bus voltage within the specified range, and the system power is balanced by increasing or decreasing the load.
储能模块通过充/放电操作平衡系统短期的功率波动，利用荷电状态变量确定储能模块是否过度充/放电，设置当SOC＜10％时，储能模块过度放电，不能进行放电操作；当SOC＞90％时，储能模块过度充电，不能进行充电操作，将储能模块的充/放电策略分为主动充电、主动放电、被动充电和被动放电四种运行模式：The energy storage module balances the short-term power fluctuations of the system through charging/discharging operations, and uses the state of charge variable to determine whether the energy storage module is over-charged/discharged. When the SOC<10%, the energy storage module is over-discharged and cannot perform discharge operations; when When SOC>90%, the energy storage module is overcharged and cannot be charged. The charging/discharging strategy of the energy storage module is divided into four operating modes: active charging, active discharging, passive charging and passive discharging:
1)主动充电：当直流母线电压偏差度|ε|＜1％并保持一段时间T，储能模块荷电状态SOC<40％时，对储能模块进行主动充电，储能模块的荷电状态SOC将上升，当SOC数值达到50％或引起直流母线电压偏差度|ε|＞2％时，停止主动充电；1) Active charging: When the deviation of the DC bus voltage |ε|<1% and maintain for a period of time T, and the state of charge of the energy storage module SOC<40%, the energy storage module is actively charged, and the state of charge of the energy storage module SOC will rise, when the SOC value reaches 50% or causes DC bus voltage deviation |ε|>2%, stop active charging;
2)主动放电：当直流母线电压偏差度|ε|＜1％并保持一段时间，储能模块荷电状态SOC>60％时，控制储能模块向电网主动放电，储能模块的荷电状态SOC将下降，当SOC数值达到50％或引起直流母线电压偏差度|ε|＞2％时，停止主动放电；2) Active discharge: When the DC bus voltage deviation |ε|<1% and maintain for a period of time, when the state of charge of the energy storage module SOC>60%, control the active discharge of the energy storage module to the grid, and the state of charge of the energy storage module SOC will drop, and when the SOC value reaches 50% or causes DC bus voltage deviation |ε|>2%, stop active discharge;
3)被动充电：当直流母线电压偏差度ε＞3％，储能模块荷电状态SOC<80％时，控制储能模块进行被动充电，储能模块的荷电状态SOC将上升，当|ε|＜1％并保持一段时间或SOC>90％时，停止被动充电；3) Passive charging: When the DC bus voltage deviation ε>3% and the SOC of the energy storage module <80%, the energy storage module is controlled to perform passive charging, and the SOC of the energy storage module will rise. When |ε When |<1% and maintain for a period of time or SOC>90%, stop passive charging;
4)被动放电：当直流母线电压偏差度ε＜-3％，储能模块荷电状态SOC>20％时，控制储能模块向电网被动放电，储能模块的荷电状态SOC将下降，当|ε|＜1％并保持一段时间或SOC<10％时停止被动放电。4) Passive discharge: When the DC bus voltage deviation ε<-3%, and the SOC of the energy storage module>20%, control the passive discharge of the energy storage module to the grid, and the SOC of the energy storage module will drop. Stop passive discharge when |ε|<1% and maintain for a period of time or when SOC<10%.
所述的主动充/放电操作模式保持储能模块的荷电状态SOC在指定的水平，被动充/放电操作模式维持直流母线电压稳定；储能模块主动充/放电时，采用恒流充/放电，对直流母线电压不造成波动；储能模块被动充/放电时采用恒压充/放电，采用双闭环控制，维持电网内的功率平衡，进而维持稳定的母线电压；在电流环中加入限制。The active charging/discharging operation mode keeps the SOC of the energy storage module at a specified level, and the passive charging/discharging operation mode maintains the DC bus voltage stability; when the energy storage module is actively charging/discharging, it uses constant current charging/discharging , does not cause fluctuations in the DC bus voltage; the energy storage module uses constant voltage charging/discharging when passively charging/discharging, and adopts double closed-loop control to maintain power balance in the grid, thereby maintaining a stable bus voltage; adding restrictions to the current loop.
本发明的有益效果在于：The beneficial effects of the present invention are:
仅通过检测直流母线电压信号，根据直流母线电压阈值确定储能模块充放电的状态，不仅能够实现储能模块的自动充放电功能，并且能够解决船舶MVDC综合电力推进系统运行中需要维持稳定的直流母线电压的问题，具有对通信需求低和模块独立控制的优点。Only by detecting the DC bus voltage signal and determining the charging and discharging state of the energy storage module according to the DC bus voltage threshold, it can not only realize the automatic charging and discharging function of the energy storage module, but also solve the problem of maintaining a stable DC in the operation of the ship's MVDC integrated electric propulsion system. The problem of bus voltage has the advantages of low communication requirements and independent control of modules.
附图说明Description of drawings
图1船舶MVDC综合电力推进系统简化电路；Fig.1 Simplified circuit of ship MVDC integrated electric propulsion system;
图2储能模块自动充放电流程图；Figure 2 Flow chart of automatic charging and discharging of energy storage module;
图3储能模块恒流充/放电控制框图；Fig. 3 The constant current charging/discharging control block diagram of the energy storage module;
图4储能模块恒压充/放电控制框图。Figure 4. Block diagram of constant voltage charge/discharge control of energy storage module.
具体实施方式Detailed ways
下面结合附图举例对本发明做更详细的描述：The present invention is described in more detail below in conjunction with accompanying drawing example:
(1)根据直流母线电压性能指标的要求，分别以|ε|＝3％和|ε|＝5％为界限，将储能模块分为4个运行状态；(1) According to the requirements of the DC bus voltage performance index, the energy storage module is divided into 4 operating states with |ε|=3% and |ε|=5% as the boundaries respectively;
(2)通过检测直流母线电压信号，根据直流母线电压阈值确定储能模块具体运行状态；(2) Determine the specific operating state of the energy storage module according to the DC bus voltage threshold by detecting the DC bus voltage signal;
(3)结合储能模块运行状态和荷电状态，将储能模块的充/放电策略细分为主动充电、主动放电、被动充电和被动放电四种运行模式；(3) Combining the operating state and state of charge of the energy storage module, the charging/discharging strategy of the energy storage module is subdivided into four operating modes: active charging, active discharging, passive charging and passive discharging;
(4)根据储能模块当前运行状态和荷电当前状态，选择符合运行模式特征和操作条件的自动充/放电运行模式。(4) According to the current operating state of the energy storage module and the current charging state, select an automatic charging/discharging operating mode that meets the operating mode characteristics and operating conditions.
本发明还有这样一些特点：The present invention also has some characteristics:
(1)主动和被动充/放电的区别在于前者的目的是保持储能模块的荷电状态SOC在合适的水平，后者的目的是维持直流母线电压。(1) The difference between active and passive charging/discharging is that the purpose of the former is to maintain the SOC of the energy storage module at an appropriate level, while the purpose of the latter is to maintain the DC bus voltage.
(2)储能模块主动充/放电时，采用恒流充/放电。(2) When the energy storage module is actively charging/discharging, it uses constant current charging/discharging.
(3)储能模块被动充/放电时采用恒压充/放电，采用双闭环控制，且为避免出现过电流充/放电，在电流环中加入限制(3) Constant voltage charging/discharging is adopted for passive charging/discharging of the energy storage module, and double closed-loop control is adopted, and in order to avoid overcurrent charging/discharging, restrictions are added to the current loop
结合图1，将MVDC配电系统，发电模块、储能模块等效为理想的受控直流电压源，而负载模块则可以等效为直流电流源。假设船舶左舷和右舷直流母线通过联络开关连接在一起形成一条公共直流母线，忽略传输线的损耗，得到船舶MVDC综合电力推进系统的简化电路模型。其中Cbus为各变换器直流侧电容形成的直流母线等效电容，IG＝[IG1,IG2,IG3,IG4]T、IES＝[IES1]T、IL＝[IPM1,IPM2,IPL,IL1,IL2,IL3]T分别为发电模块和储能模块的输出电流和负载模块的输入电流。Combined with Figure 1, the MVDC power distribution system, power generation module, and energy storage module are equivalent to an ideal controlled DC voltage source, while the load module can be equivalent to a DC current source. Assuming that the ship's port and starboard DC buses are connected together through a tie switch to form a common DC bus, and ignoring the loss of the transmission line, a simplified circuit model of the ship's MVDC integrated electric propulsion system is obtained. Where Cbus is the DC bus equivalent capacitance formed by the DC side capacitance of each converter, IG ＝[IG1 , IG2 , IG3 , IG4 ]T , IES ＝[IES1 ]T , IL ＝[IPM1 , IPM2 , IPL , IL1 , IL2 , IL3 ]T are the output current of the power generation module and the energy storage module and the input current of the load module, respectively.
直流母线电压Vdc可由下面的微分方程描述：The DC bus voltage Vdc can be described by the following differential equation:
当输入到直流母线的电流代数和大于0，即直流母线吸收的功率大于发出的功率时，直流母线电压上升；当输入到直流母线的电流代数和小于0时，即直流母线吸收的功率小于发出的功率时，直流母线电压下降。可以通过检测直流母线电压作为“发电-储能”能量协调控制的公共调节信号，调节发电子系统输出电流以及储能系统的充放电电流，从而满足直流母线电压运行在规定的范围内。When the algebraic sum of the current input to the DC bus is greater than 0, that is, when the power absorbed by the DC bus is greater than the output power, the DC bus voltage rises; when the algebraic sum of the current input to the DC bus is less than 0, that is, the power absorbed by the DC bus is less than the output When the power is higher, the DC bus voltage drops. By detecting the DC bus voltage as the public regulation signal for the coordinated control of "power generation-energy storage", the output current of the power generation subsystem and the charging and discharging current of the energy storage system can be adjusted, so that the DC bus voltage can be operated within the specified range.
船舶MVDC综合电力推进系统直流母线电压的性能指标如表1所示：The performance indicators of the DC bus voltage of the marine MVDC integrated electric propulsion system are shown in Table 1:
定义直流母线电压偏差度ε：Define the DC bus voltage deviation ε:
其中，Vdc为直流母线电压测量值，为直流母线电压参考值。Among them, Vdc is the measured value of DC bus voltage, It is the reference value of DC bus voltage.
结合表1对直流母线电压性能指标的要求，本发明分别以|ε|＝3％和|ε|＝5％为界限，将系统分为以下几个运行状态：Combined with the requirements of Table 1 on the DC bus voltage performance index, the present invention divides the system into the following operating states with the limits of |ε|=3% and |ε|=5% respectively:
状态1：|ε|＜3％，系统内的负载需求由各发电单元供给，在该状态下，发电管理通过协调各发电单元的输出功率维持系统内的功率平衡；State 1: |ε|<3%, the load demand in the system is supplied by each power generation unit, in this state, the power generation management maintains the power balance in the system by coordinating the output power of each power generation unit;
状态2：3％＜ε＜5％，此时表明系统中存在过剩的功率且仅依靠发电管理不足以维持直流母线电压在规定范围内，需要储能单元充电吸收过多的功率，储能管理通过监测直流母线电压Vdc的值和储能单元的荷电状态SOC，确定储能单元是否具备能力参与直流母线电压调节以及如果可以则确定储能单元的充电电流值；State 2: 3%<ε<5%, at this time It indicates that there is excess power in the system and only relying on power generation management is not enough to maintain the DC bus voltage within the specified range. The energy storage unit needs to be charged to absorb excessive power. Energy storage management monitors the value of the DC bus voltage Vdc and the energy storage unit State of charge SOC, determine whether the energy storage unit has the ability to participate in DC bus voltage regulation and if possible, determine the charging current value of the energy storage unit;
状态3：-5％＜ε＜-3％，与状态2相似，系统中功率不足，需要储能单元放电向系统输出功率以保持直流母线电压平衡，储能管理通过监测直流母线电压Vdc的值和储能单元的荷电状态SOC，确定储能单元是否具备能力参与直流母线电压调节以及如果可以则确定储能单元的放电电流值；State 3: -5%<ε<-3%, Similar to state 2, the power in the system is insufficient, and the energy storage unit needs to discharge and output power to the system to maintain the balance of theDC bus voltage. Whether the energy unit has the ability to participate in the regulation of the DC bus voltage and if possible, determine the discharge current value of the energy storage unit;
状态4：|ε|＞5％，此时发电管理与储能管理不足以维持直流母线电压在规定范围内，需要通过增加或减少负载以平衡系统功率。State 4: |ε| > 5%, at this time, the power generation management and energy storage management are not enough to maintain the DC bus voltage within the specified range, and it is necessary to balance the system power by increasing or decreasing the load.
结合图2，给出储能模块自动充放电流程图，储能子系统充放电策略详述如下：Combined with Figure 2, the flow chart of automatic charging and discharging of the energy storage module is given, and the charging and discharging strategy of the energy storage subsystem is described in detail as follows:
储能模块通过充/放电操作平衡系统短期的功率波动，为了防止过度的充/放电对储能模块使用寿命造成不利影响，利用荷电状态(State of Charge,SOC)这一变量确定储能模块是否过度充/放电。本发明设置当SOC＜10％时，储能模块过度放电，不能进行放电操作；当SOC＞90％时，储能模块过度充电，不能进行充电操作。此外，考虑到全电力船舶在执行任务时，剧烈的负荷波动可能随时出现，具有高度的不确定性，为了避免储能模块过度充/放电失去平衡系统功率作用，应使储能模块的SOC保持在中等水平，为储能模块的充/放电能量留有裕度。The energy storage module balances the short-term power fluctuations of the system through charging/discharging operations. In order to prevent excessive charging/discharging from adversely affecting the service life of the energy storage module, the state of charge (State of Charge, SOC) is used to determine the energy storage module. Is it overcharged/discharged. According to the present invention, when the SOC is less than 10%, the energy storage module is over-discharged, and the discharge operation cannot be performed; when the SOC is greater than 90%, the energy storage module is over-charged, and the charging operation cannot be performed. In addition, considering that severe load fluctuations may occur at any time when an all-electric ship is performing tasks, with a high degree of uncertainty, in order to avoid excessive charging/discharging of the energy storage module and losing the balance of system power, the SOC of the energy storage module should be maintained At a medium level, there is a margin for the charging/discharging energy of the energy storage module.
根据上述分析，本发明将储能模块的充/放电策略细分为主动充电、主动放电、被动充电和被动放电四种运行模式，每种运行模式特征及操作条件详细说明如下：According to the above analysis, the present invention subdivides the charging/discharging strategy of the energy storage module into four operating modes: active charging, active discharging, passive charging and passive discharging. The characteristics and operating conditions of each operating mode are described in detail as follows:
1)主动充电：当直流母线电压偏差度|ε|＜1％并保持一段时间，储能模块荷电状态SOC<40％时，对储能模块进行主动充电，储能模块的荷电状态SOC将上升，当SOC数值达到50％或引起直流母线电压偏差度|ε|＞2％时，停止主动充电；1) Active charging: When the DC bus voltage deviation |ε|<1% and maintain for a period of time, and the SOC of the energy storage module is less than 40%, the energy storage module is actively charged, and the SOC of the energy storage module will rise, when the SOC value reaches 50% or causes DC bus voltage deviation |ε|>2%, stop active charging;
2)主动放电：当直流母线电压偏差度|ε|＜1％并保持一段时间，储能模块荷电状态SOC>60％时，控制储能模块向电网主动放电，储能模块的荷电状态SOC将下降，当SOC数值达到50％或引起直流母线电压偏差度|ε|＞2％时，停止主动放电；2) Active discharge: When the DC bus voltage deviation |ε|<1% and maintain for a period of time, when the state of charge of the energy storage module SOC>60%, control the active discharge of the energy storage module to the grid, and the state of charge of the energy storage module SOC will drop, and when the SOC value reaches 50% or causes DC bus voltage deviation |ε|>2%, stop active discharge;
3)被动充电：当直流母线电压偏差度ε＞3％，储能模块荷电状态SOC<80％时，控制储能模块进行被动充电，储能模块的荷电状态SOC将上升，当|ε|＜1％并保持一段时间或SOC>90％时，停止被动充电；3) Passive charging: When the DC bus voltage deviation ε>3% and the SOC of the energy storage module <80%, the energy storage module is controlled to perform passive charging, and the SOC of the energy storage module will rise. When |ε When |<1% and maintain for a period of time or SOC>90%, stop passive charging;
4)被动放电：当直流母线电压偏差度ε＜-3％，储能模块荷电状态SOC>20％时，控制储能模块向电网被动放电，储能模块的荷电状态SOC将下降，当|ε|＜1％并保持一段时间或SOC<10％时停止被动放电。4) Passive discharge: When the DC bus voltage deviation ε<-3%, and the SOC of the energy storage module>20%, control the passive discharge of the energy storage module to the grid, and the SOC of the energy storage module will drop. Stop passive discharge when |ε|<1% and maintain for a period of time or when SOC<10%.
储能模块充/放电时可采用恒压充/放电或恒流充/放电，结合图3和图4，下面详细说明不同模式下储能模块采用的充/放电的方式及充/放电电流的计算。When charging/discharging the energy storage module, constant voltage charging/discharging or constant current charging/discharging can be used. Combined with Figure 3 and Figure 4, the charging/discharging methods and charging/discharging currents adopted by the energy storage module in different modes will be described in detail below. calculate.
结合图3，储能模块主动充/放电时，为了保证对直流母线电压不造成剧烈波动，采用恒流充/放电，其中和IES分别表示储能模块恒流充/放电电流的参考值和实际充/放电电流的值，D为占空比信号。Combined with Figure 3, when the energy storage module is actively charging/discharging, in order to ensure that the DC bus voltage does not cause severe fluctuations, constant current charging/discharging is used, where andIES represent the reference value of the constant current charging/discharging current of the energy storage module and the value of the actual charging/discharging current, respectively, and D is the duty cycle signal.
为充/放电电流的参考值，考虑到发电子系统输出电流的变化率受其发电机组爬坡速度的影响，因此储能模块的充放电电流选取应满足： is the reference value of the charging/discharging current, considering that the change rate of the output current of the power generation subsystem is affected by the climbing speed of the generator set, so the charging and discharging current of the energy storage module The selection should satisfy:
其中，IG,i表示发电单元的输出电流。Among them, IG,i represents the output current of the generating unit.
结合图4，储能模块被动充/放电时属于松弛终端，其目的是维持电网内的功率平衡，进而维持稳定的母线电压，因此储能模块被动充/放电时采用恒压充/放电，采用双闭环控制，且为避免出现过电流充/放电，在电流环中加入限制，其中和Vdc分别表示直流母线的参考电压和实际电压，和分别表示充/放电电流的上下界，其他符号含义与图3中一致。Combined with Figure 4, the passive charging/discharging of the energy storage module is a loose terminal, and its purpose is to maintain the power balance in the grid, thereby maintaining a stable bus voltage. Double closed-loop control, and in order to avoid over-current charging/discharging, a limit is added to the current loop, where and Vdc represent the reference voltage and actual voltage of the DC bus, respectively, and respectively represent the upper and lower bounds of the charging/discharging current, and the meanings of other symbols are consistent with those in Figure 3.
本发明的目的在于提供一种用于船舶MVDC综合电力推进系统的储能模块自动充放电方法，仅通过检测直流母线电压信号，根据直流母线电压阈值确定储能模块充放电的状态，不仅能够实现储能模块的自动充放电功能，并且能够解决船舶MVDC综合电力推进系统运行中需要维持稳定的直流母线电压的问题，具有对通信需求低和模块独立控制的优点。The purpose of the present invention is to provide a method for automatic charging and discharging of energy storage modules used in marine MVDC integrated electric propulsion systems. Only by detecting the DC bus voltage signal and determining the charging and discharging state of the energy storage module according to the DC bus voltage threshold, it can not only realize The automatic charge and discharge function of the energy storage module can solve the problem of maintaining a stable DC bus voltage during the operation of the ship's MVDC integrated electric propulsion system, and has the advantages of low communication requirements and independent control of the module.
| Application Number | Priority Date | Filing Date | Title |
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| CN201611040658.0ACN106356837B (en) | 2016-11-11 | 2016-11-11 | A kind of energy-storage module automatic inflatable method for electrically for ship MVDC synthesis electrical method system |
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