Extensible methanol extended-range micro power station intelligent management system and management method

Abstract

The invention relates to the technical field of energy management, in particular to an intelligent management system and management method for an extensible methanol extended-range micro power station, and the system comprises a plurality of methanol power generation groups which comprise a single methanol engine and a power generator; the energy storage electric cabinet is in high-voltage direct-current connection with the methanol micro power station power generation set through the power distribution box, the energy storage electric cabinet is connected with an electric load through the inverter, and the complete machine controller starts the methanol power generation set to supply power to an energy storage electric cabinet battery and the electric load including the charging pile through the power distribution box and the inverter; and the power balance control of the lowest methanol consumption comprises the following steps: comparing the output power of the methanol extended-range micro power station formed by the plurality of methanol power generation groups with the power of the electric load, and controlling the number of the methanol power generation groups working in the methanol extended-range micro power station to supply power. The method has the advantages that power following is accurately carried out in the power supply process, minimum control over methanol consumption is guaranteed, and the method has the advantages that power limitation conditions of a whole machine system are regularly awakened and monitored, flexible allocation is carried out, and power supply is stable.

Description

Technical Field

[0001] The present application relates to the field of energy management technology, and in particular to an expandable methanol range-extending micro-power station intelligent management system and management method. Background Art

[0002] With the development of economic globalization and technological innovation, the research on energy-saving and emission-reduction technologies in the shipping industry has become urgent. Among them, new energy sources such as fuel cells, battery energy storage, wind energy, solar energy, etc., which are different from traditional fossil energy, have been widely used on land. Methanol is increasingly being called for as an alternative fuel for the low-carbon transformation of the shipping industry, and battery energy storage is even more widely used.

[0003] The existing methanol range-extended power generation energy management system adopts the scheme of methanol power generation or methanol plus multiple energy sources complementary power generation, but the existing methanol range-extended power generation energy management system does not take into account the issues of energy management and flexible scheduling. When there are multiple methanol engines and generators forming a methanol power generation array, the optimal control of energy consumption is not considered; when the methanol micro power station is not connected to the power load, if the low-voltage control system is kept working continuously, energy waste will be caused; if the low-voltage control system is kept dormant continuously, the system status of the methanol micro power station cannot be monitored in advance, and the micro power station cannot be flexibly scheduled. Summary of the invention

[0004] The present invention aims to solve one of the problems existing in the background technology.

[0005] To this end, the present invention provides an expandable methanol range-extended micro-power station intelligent management system and management method, which not only has the advantages of accurately following the power supply process and ensuring the minimum control of methanol consumption, but also has the characteristics of timed wake-up monitoring of the power limit of the whole system for flexible allocation and stable power supply.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] An expandable methanol range-extending micro-power station intelligent management system, including:

[0008] A plurality of methanol power generation groups, each of which includes a single methanol engine and a generator;

[0009] An energy storage cabinet is connected to a methanol micro-power station generating set via a distribution box for high voltage direct current connection, and the energy storage cabinet is connected to an electrical load via an inverter.

[0010] Furthermore, it also includes a whole machine manager, which is connected to the methanol engine, the generator, and the energy storage cabinet.

[0011] Furthermore, the energy storage cabinet is connected to a battery via a DCDC converter.

[0012] Furthermore, the energy storage cabinet is connected to the coolant heating device of the engine via high voltage direct current.

[0013] A scalable intelligent management method for a methanol range-extending micro power station comprises the following steps: using a battery of an energy storage cabinet to supply power; when the continuous discharge power of the battery is lower than the power demand of an electric load and lasts for a period of time, starting power balance control based on minimum methanol consumption: a whole machine controller starts a methanol power generation group to supply power to the battery of the energy storage cabinet and electric loads including charging piles through an inverter via a distribution box; the power balance control of the minimum methanol consumption comprises: comparing the output power of a methanol range-extending micro power station composed of a plurality of methanol power generation groups and the power of the electric load, and controlling the number of methanol power generation groups working in the methanol range-extending micro power station to supply power.

[0014] Further, by comparing (methanol consumption / power generation efficiency when the single methanol power generation unit is in power balance) with (the sum of methanol consumption / power generation efficiency when the dual methanol power generation units are in power balance), when the power load power is ≤ the operating output power limit of the single methanol power generation unit, the single power generation unit is started to generate electricity;

[0015] When the operating output power of a single methanol generator set is less than the power load power, that is, a single methanol generator set cannot meet the load, then compare (the sum of methanol consumption / power generation efficiency when the two methanol generator sets are in power balance) with (the sum of methanol consumption / power generation efficiency when the three methanol generator sets are in power balance). When (the sum of methanol consumption / power generation efficiency when the two methanol generator sets are in power balance) ≤ (the sum of methanol consumption / power generation efficiency when the three methanol generator sets are in power balance), the two methanol generator sets are used for power supply; and so on, compare (the sum of methanol consumption / power generation efficiency) step by step, and select the number of methanol generator sets for power generation.

[0016] Furthermore, when the power demanded by the electric load is greater than the sum of the output powers of the maximum number of methanol generator sets of the scalable methanol range-extending micro power station, the maximum output capacity of the system is maintained.

[0017] Furthermore, when the number of operating power generating sets is greater than or equal to two, power monitoring is performed at all times. When the power demand of the electric load is less than the sum of the output powers of the methanol generating sets of the expandable methanol range-extending micro power station, the number of methanol generating sets is shut down step by step after a delay of 30 seconds.

[0018] The beneficial effect of the present invention is that the present invention performs startup and shutdown management of the power generation group according to the real-time power demand of the electric load and the calculation of the minimum methanol consumption to reduce the minimum methanol consumption, and realizes the system timing monitoring of the methanol micro power station before the electric load is connected, which not only avoids energy waste but also ensures stable power supply demand.

[0019] The present invention realizes a more scientific power following strategy. When the power load is connected and power generation is required, the startup and shutdown management of the power generation group is performed according to the required power and the minimum methanol consumption calculation, which reduces the methanol consumption and saves the power generation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 It is a structural schematic diagram of the expandable methanol range-extending micro-power station intelligent management system in the present invention.

[0022] Figure 2 It is a structural schematic diagram of the methanol range-extending micro power station in the present invention.

[0023] Figure 3 It is an implementation principle diagram of the expandable methanol range-extending micro power station intelligent management method in the present invention. DETAILED DESCRIPTION

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] An expandable methanol range-extending micro power station intelligent management system includes a methanol power generation unit, a generator unit, an energy storage cabinet, a whole machine control system, an intelligent communication terminal and a cloud-based intelligent management system.

[0028] Each methanol generator set includes a single methanol engine and generator. Multiple methanol generator sets are integrated into a methanol micro-power station generator set through a high-voltage system. The energy storage cabinet is connected to the methanol micro-power station generator set through a high-voltage direct current through a distribution box.

[0029] Specifically, the energy storage cabinet is connected to the coolant heating device of the engine through high-voltage direct current; the energy storage cabinet is connected to the battery through a DCDC converter to provide low-voltage power to the battery; the energy storage cabinet is connected to the charging pile through high-voltage alternating current, and the energy storage cabinet can be connected to power loads other than the charging pile through high-voltage direct current, or through a high-voltage alternating current through an inverter.

[0030] The whole machine control system is equipped with a hard-wired power generation cut-off switch. The whole machine control system includes a methanol engine controller, a generator controller, and an energy storage cabinet controller, which are used to control the methanol engine, generator, and energy storage cabinet respectively. The intelligent communication terminal equipment is interactively connected to the whole machine control system through CAN, and the intelligent communication terminal equipment is connected to the cloud-based intelligent management system through 4G / 5G.

[0031] A scalable intelligent management method for a methanol range-extending micro power station is provided, which is based on comparing the output power and load power of the methanol range-extending micro power station, specifically:

[0032] S1: The battery of the energy storage cabinet is used for power supply first. When the battery discharge power is lower than the power demand of the power load and lasts for 30 seconds, the power balance control based on the minimum methanol consumption is started: the whole machine controller starts the methanol power generation group to supply power to the battery of the energy storage cabinet and the power load including the charging pile through the distribution box and the inverter;

[0033] S2: Power balance control based on minimum methanol consumption

[0034] First, compare (methanol consumption / power generation efficiency when the single methanol power generation unit is in power balance) with (the sum of methanol consumption / power generation efficiency when the dual methanol power generation units are in power balance). When the power load power is ≤ the operating output power limit of the single methanol power generation unit, start the single power generation unit to generate electricity.

[0035] When the operating output power of a single methanol generator set is less than the power load power, that is, a single methanol generator set cannot meet the load, then compare (the sum of methanol consumption / power generation efficiency when the dual methanol generator sets are in power balance) with (the sum of methanol consumption / power generation efficiency when the triple methanol generator sets are in power balance). When (the sum of methanol consumption / power generation efficiency when the dual methanol generator sets are in power balance) ≤ (the sum of methanol consumption / power generation efficiency when the triple methanol generator sets are in power balance), the dual methanol generator sets are used for power supply;

[0036] Similarly, the number of methanol generator sets for power generation is selected by comparing (methanol consumption / power generation efficiency) step by step until the power load demand power is greater than the sum of the output power of the maximum number of methanol generator sets in the expandable methanol range-extending micro power station, and the system's maximum output capacity is maintained.

[0037] Specifically, the calculation criteria for energy allocation based on methanol consumption are as follows:

[0038] S2.1 Set the power of the electric load to P req , the upper limit of single engine output power is P max , the single engine output power is P eng , single generator output power P em , single engine speed is Spd eng , single generator speed is Spd em ;

[0039] S2.2 Based on the single engine output power P eng With single engine speed Spd eng Query the two-dimensional table of the engine factory settings to obtain the methanol consumption of a single engine, set as U 1 ; (If the second engine is also started to generate electricity, the methanol consumption of the second engine is set to U 2 , and so on, the methanol consumption of the nth engine is set as U n );

[0040] S2.3 Based on the single generator output power P em With single generator speed Spd em Query the two-dimensional table of the generator factory settings to obtain the power generation efficiency of a single generator, set as γ 1 ; (If the second engine is also started to generate electricity, the methanol consumption of the second engine is set to γ 2 , and so on, the methanol consumption of the nth engine is set to γ n );

[0041] S2.4 When the engine and the generator form a single generating set to generate electricity, the comprehensive methanol consumption of the single generating set (set as V n), based on the above S2.1-S2.3 settings, when a single generating unit starts generating electricity, the comprehensive methanol consumption of the single generating unit is V 1 =U 1 / γ 1 ;

[0042] S2.5 When n generating units generate electricity simultaneously, the total methanol consumption of the generating units is V = V 1 +V 2 +…+V n ;

[0043] S2.6 When the power load power P req ≤ Single engine output power upper limit P max When the intelligent energy management system compares the comprehensive methanol consumption of the single power generation group with the comprehensive methanol consumption of the dual power generation group, the total methanol consumption of the multi-power generation group of S2.5 is V = V 1 +V 2 +…+V n The calculated result V is the smallest;

[0044] S2.7 When the power load power P req ≤ Upper limit of output power of two engines P max When the sum of the two generating units is V, the intelligent energy management system compares the comprehensive methanol consumption of the two generating units with the comprehensive methanol consumption of the three generating units. The total methanol consumption of the multiple generating units of S2.5 is V = V 1 +V 2 +…+V n The calculated result V is the smallest;

[0045] S2.8 is analogous to S2.6 and S2.7. When the power load is P req ≤ n engines output power upper limit P max When the sum of the total methanol consumption of n generating units is V = V, the intelligent energy management system compares the comprehensive methanol consumption of n generating units with the comprehensive methanol consumption of n+1 generating units. The total methanol consumption of multiple generating units in S2.5 is V = V 1 +V 2 +…+V n+1 The calculated result V is the smallest;

[0046] S2.9 When the power load power P req > All engine output power upper limit P max When the sum of the output power is guaranteed to meet the power load demand, all generating sets will output at the maximum output power.

[0047] S3, shutdown control

[0048] S3.1 When a single generator set is running, if there is no power generation request, the single generator set will be shut down;

[0049] S3.2 When the number of operating power generating sets is greater than or equal to two, power monitoring is performed at all times. When the power demand of the electric load is less than the sum of the output powers of the methanol power generating sets of the expandable methanol range-extending micro power station, the number of methanol power generating sets is shut down step by step after a delay of 30 seconds.

[0050] Specifically, starting from S3.1, if two groups of methanol power generation groups are currently used for power supply, power monitoring is performed. When it is detected that only one group of power generation groups is needed to meet the power load demand and maintain the minimum methanol consumption, the second group of power generation groups is stopped after a delay of 30 seconds to prevent frequent starting of the engine.

[0051] Example 1

[0052] When the power load demand is 100kw, the upper limit of the output capacity of a single generating set is 200kw. At this time, refer to S2.1 of the startup control. If the methanol consumption of a single generating set outputting 100kw is 100g / kwh (refer to the concept of relative fuel consumption of gasoline or diesel engines), the system power generation efficiency is 0.9, and the minimum methanol consumption of the methanol engine is 40g / kwh. At the single lowest methanol consumption operating point, the output power is 40kw, and the system power generation efficiency is 0.92. The second unit needs to output 60kw. Assuming that the methanol consumption is 50g / kwh and the system power generation efficiency is 0.91, the methanol consumption of the single generating set is 100 / 0.9=111.1g / kwh, and the methanol consumption of the dual generating set is 40 / 0.92+50 / 0.91=98.4g / kwh. Then start the second generating set to generate electricity according to the power distribution of 40kw and 60kw.

[0053] After the second generating set starts to generate electricity, it is monitored that the power load demand drops from 100kw to 60kw. The methanol consumption of a single generating set is 50 / 0.91=54.9g / kwh. If 60kw is allocated to two generating sets for power generation, and one generating set is allocated 30kw, the corresponding methanol consumption is 50g / kwh. The system power generation efficiency is 0.9. When two generating sets are used for power generation, the methanol consumption is 50 / 0.9*2=111.1g / kwh. The system delays 30 seconds to shut down the second generating set after comparison.

[0054] Example 2

[0055] The principle of two methanol power generation groups supplying power simultaneously:

[0056] If the total power demand of the power load is 100kw (including battery charging demand and charging pile power demand), then the total output power demand of the two methanol power generation groups is 100kw (the example does not consider high voltage loss and small power demand such as DCDC). Assuming that the methanol engine external characteristic data is queried and the methanol engine has a minimum methanol consumption of 50g / kwh in the speed range of 1000rpm~1500rpm, and a maximum output power of 50kw, then the two methanol engines are allocated to output 50kw respectively. Assuming that the methanol consumption in the speed range of 1000rpm~1500rpm is at the minimum level of 50g / kwh, but the maximum output power is 40kw, then one methanol engine is controlled at 1000rpm~1500rpm, with an output of 40kw, and the other needs to increase the speed to output 60kw. At this time, the methanol consumption exceeds 50g / kwh.

[0057] To sum up, on the one hand, the present invention performs startup and shutdown management of the power generation group according to the real-time power demand of the electric load and the calculation of the minimum methanol consumption to reduce the minimum methanol consumption, and realizes the system timing monitoring of the methanol micro-power station before the power load is connected, which not only avoids energy waste, but also ensures stable power supply needs.

[0058] On the other hand, the present invention adopts a timed wake-up function to monitor the system of the methanol micro power station regularly before the power load is connected. When the voltage of the 24V auxiliary battery is lower than 22V and lasts for 1 minute, the 24V battery is supplemented with power through the energy storage battery. At the same time, during the wake-up process, the engine system status, the generator system status, the DCDC system status, etc. are monitored, the power output capacity of the power station is calculated, and the power supply demand of the power load is flexibly matched, thereby realizing a more scientific power following strategy. When the power load is connected and needs to generate electricity, the startup and shutdown management of the power generation group is performed according to the required power and the minimum methanol consumption calculation, thereby reducing the methanol consumption and saving the power generation cost.

[0059] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An expandable methanol range-extending micro-power station intelligent management system, characterized in that: include, A plurality of methanol power generation groups, each of which includes a single methanol engine and a generator; An energy storage cabinet is connected to a methanol micro-power station generating set via a distribution box for high voltage direct current connection, and the energy storage cabinet is connected to an electrical load via an inverter.

2. The scalable methanol range-extending micro-power station intelligent management system according to claim 1 is characterized in that: It also includes a whole machine manager, which is connected to the methanol engine, the generator, and the energy storage cabinet.

3. The scalable methanol range-extending micro-power station intelligent management system according to claim 1 is characterized in that: The energy storage cabinet is connected to a battery via a DCDC converter.

4. The scalable methanol range-extending micro-power station intelligent management system according to claim 1 is characterized in that: The energy storage cabinet is connected to the coolant heating device of the engine via high voltage direct current.

5. A scalable intelligent management method for a methanol range-extending micro power station, characterized in that: The method comprises the following steps: using the battery of the energy storage cabinet to supply power; when the continuous discharge power of the battery is lower than the power demand of the electric load and lasts for a period of time, starting the power balance control based on the minimum methanol consumption: the whole machine controller starts the methanol power generation group to supply power to the battery of the energy storage cabinet and the electric load including the charging pile through the distribution box and the inverter; the power balance control of the minimum methanol consumption is as follows: comparing the output power of the methanol range-extending micro-power station composed of multiple methanol power generation groups and the power of the electric load, and controlling the number of methanol power generation groups working in the methanol range-extending micro-power station to supply power.

6. The scalable methanol range-extending micro-power station intelligent management method according to claim 5 is characterized in that: Compare (methanol consumption / power generation efficiency when the single methanol power generation unit is in power balance) with (the sum of methanol consumption / power generation efficiency when the dual methanol power generation units are in power balance). When the power load power is ≤ the operating output power limit of the single methanol power generation unit, start the single power generation unit to generate electricity. When the operating output power of a single methanol generator set is less than the power load power, that is, a single methanol generator set cannot meet the load, then compare (the sum of methanol consumption / power generation efficiency when the two methanol generator sets are in power balance) with (the sum of methanol consumption / power generation efficiency when the three methanol generator sets are in power balance). When (the sum of methanol consumption / power generation efficiency when the two methanol generator sets are in power balance) ≤ (the sum of methanol consumption / power generation efficiency when the three methanol generator sets are in power balance), the two methanol generator sets are used for power supply; and so on, compare (the sum of methanol consumption / power generation efficiency) step by step, and select the number of methanol generator sets for power generation.

7. The scalable methanol range-extending micro-power station intelligent management method according to claim 5 is characterized in that: When the power demand of the electric load is greater than the sum of the output powers of the maximum number of methanol generator sets in the expandable methanol range-extending micro power station, the maximum output capacity of the system is maintained.

8. The scalable methanol range-extending micro-power station intelligent management method according to claim 5 is characterized in that: When the number of operating power generating sets is greater than or equal to two, power monitoring is carried out at all times. When the power demand of the electric load is less than the sum of the output powers of the methanol generating sets of the expandable methanol range-extending micro power station, the number of methanol generating sets is shut down step by step after a delay of 30 seconds.

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