Industrial and commercial energy storage demand control method and system, medium and product

Abstract

The invention provides an industrial and commercial energy storage demand control method and system, a medium and a product, and the method comprises the steps: monitoring the average electrical load per minute of a user in real time, if the average electrical load exceeds the monthly demand, generating a deviation, determining a control target of the next minute after the deviation is generated, and adopting a second-level control strategy according to the control target; according to the second-level control strategy, n rounds of control are implemented within one minute, and the time of each round of control is a plurality of same seconds; taking the control target of the next minute as the control target of each round, and adjusting the control strategy of the next round according to the user load real-time power of each round; 14 minutes after deviation is generated are used as a control period, and whether control of the next minute is started or not is determined according to the control result of one minute every time in the control period. According to the invention, more accurate demand control of the energy storage system can be realized.

Description

Technical Field

[0001] The present invention belongs to the field of energy storage technology, and in particular relates to an industrial and commercial energy storage demand control method and system, medium, and product. Background Art

[0002] Industrial and commercial energy storage has multiple application scenarios: peak-valley price differences, alleviating power capacity expansion, reducing power demand, participating in power auxiliary services, and participating in power energy market transactions.

[0003] Among all application scenarios, the peak-valley price difference is the most common profit scenario. In provinces with large time-of-use electricity price differences, a large number of industrial and commercial energy storages have been put into operation and have begun to make profits by relying on the peak-valley price difference. With the development of the economy, the peak-valley electricity price difference in various provinces has widened year by year, and the industrial and commercial energy storage market has further expanded. At the same time, the importance and necessity of energy storage demand control have also been further reflected.

[0004] 1. The importance of energy storage demand control:

[0005] For enterprise users who are billed based on demand (i.e., the electricity bill is calculated based on the maximum power load within a certain period of time, for example, the maximum power load within a month is used as the monthly demand for billing), there are two obvious types of demand control risks:

[0006] 1. The electricity load of corporate users has increased, constantly exceeding the original monthly demand, resulting in the monthly demand electricity charges of corporate users remaining high;

[0007] 2. The electricity load of corporate users is uneven. The peak electricity consumption in a few periods of each month significantly increases the monthly demand value, resulting in a higher monthly demand electricity charge.

[0008] Taking the unit price of 10KV industrial and commercial electricity demand in a certain province (40 yuan / KW) as an example, the average monthly electricity load of enterprise user A is 10,000 KW, and the monthly maximum electricity load is 12,000 kW (peak / average = 120%, which is a normal fluctuation in electricity consumption). If the maximum electricity demand in a certain month exceeds 13,000 kW, the monthly electricity bill will increase from 480,000 to 520,000. The increase of 40,000 in a single month may not be much, but if it is not well controlled, the monthly electricity demand throughout the year will reach or even exceed 13,000 kW, and the annual increase in electricity bills for enterprise users will reach at least 480,000, which is a heavy burden for enterprise users.

[0009] 2. Necessity of energy storage demand control:

[0010] The energy storage system must have good control over demand. If it is not well controlled, energy storage may have a negative impact on the demand electricity charges of corporate users.

[0011] The energy storage system can bring cheaper electricity prices to corporate users (storing valley-priced electricity at night and reusing it during the day), but the charging period coincides with the corporate users' maximum electricity demand that month, which can easily make a negative contribution to the excess electricity load.

[0012] Taking corporate user A as an example, the average power load is 10,000 KW. It is calculated that the most suitable installation scale of energy storage is 2MW / 4MWh. Assuming that corporate user A is charging at noon, the corporate user's own power consumption reaches a peak of 12,000 KW, which happens to be the time for energy storage charging. If the energy storage system is not controlled, corporate user A will have a power consumption peak of 14,000 KW. The maximum power load of the month is 14,000 KW, of which energy storage contributes 2,000 kW. Corporate user A will have to pay an additional 80,000 yuan in electricity bills (2,000 kW*40 yuan / kVA / month) due to the negative impact of energy storage on demand charges. As for 2MW / 4MWh energy storage, taking the peak-to-valley price difference in a certain province as an example, if it works continuously for 30 days and performs two cycles every day (it is very difficult for energy storage to stably cycle twice a month, which is subject to many factors such as whether the corporate user has holidays, the volatility of the corporate user's electricity consumption, and the installed capacity of the corporate user's power transformer), it can only make a profit of 118,000 yuan (4000KWh installed capacity*90% DOD discharge depth*1.1 yuan energy storage average daily income*30 days). Assuming that the energy storage has only an 80% operation rate (a very common operating days ratio for industrial and commercial energy storage), the monthly income is 95,040 yuan. Excluding the proportion allocated to corporate user A (commonly 20% or 30%), the energy storage investor's monthly income is 76,000 yuan, which is not enough to compensate for the negative impact of the energy storage itself in the excess demand.

[0013] Therefore, demand control is an essential means for energy storage systems, which can reduce or eliminate the negative contribution of excess power load. Otherwise, it is easy to suffer obvious losses, which will bring negative impacts and economic losses to corporate users.

[0014] The following problems have not been solved in the existing technology for energy storage demand control:

[0015] 1. Whether energy storage can control all monthly excess demand and how to control it;

[0016] 2. For uncontrollable monthly excess demand, what strategies should energy storage adopt to reduce negative impacts and losses?

[0017] 3. What kind of control mechanism should be used to control monthly excess demand for energy storage? For example, what should be the control frequency, how is the control target for each frequency point generated, and what means are used to achieve the target for that frequency point. Summary of the invention

[0018] The present invention proposes an industrial and commercial energy storage demand control method and system, medium, and product, which are combined with a conventional peak-valley price charging and discharging strategy to achieve more accurate demand control of the energy storage system.

[0019] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0020] A method for controlling industrial and commercial energy storage demand, comprising:

[0021] S1. Real-time monitoring of the average power load of users per minute. If a deviation occurs when the monthly demand is exceeded, the control target for the next minute is determined after the deviation occurs, and a second-level control strategy is adopted according to the control target; the second-level control strategy is to implement n rounds of control within one minute, and the time of each round of control is the same number of seconds;

[0022] S2, taking the control target of the next minute as the control target of each round, and adjusting the control strategy of the next round according to the real-time power of the user load of each round;

[0023] S3. Take 14 minutes after the deviation occurs as the control cycle, and decide whether to start the control for the next minute based on the control result of each minute within the control cycle.

[0024] Furthermore, the control target for the next minute in step S1 includes two levels. The first control target is that the real-time demand does not exceed the monthly demand, which is expressed as DC-X(0), where DC represents the monthly demand and X(0) represents the deviation. The second control target is to eliminate the load power and charge amount increased by energy storage charging within one minute when the deviation occurs, and calculate the load power and discharge amount that should be released by discharging within the control period.

[0025] Furthermore, step S2 specifically includes:

[0026] S201, taking DC-X(0)+PSS as the upper limit and DC-X(0)-PSS as the lower limit, determine whether PL(i-1) is between the upper limit and the lower limit, where PSS is the rated installed power of the energy storage, i represents the i-th round of control within one minute, i=1, 2, ..., n; PL(i-1) is the real-time power of the user load in the previous round of control, and PL(0) represents the real-time power of the original power load of the user without being disturbed by the energy storage at the 0th second;

[0027] S202, if PL(i-1) is between the upper limit and the lower limit, whether the energy storage is discharged or charged is determined according to whether PL(i) is greater than or less than the first control target, and the second control target is canceled at the same time;

[0028] S203, if PL(i-1) is greater than the upper limit, the energy storage is fully discharged;

[0029] S204, if PL(i-1) is less than the lower limit, the energy storage is fully charged;

[0030] S205, execute n rounds of control in a loop, and calculate the real-time power of this minute.

[0031] Furthermore, step S3 specifically includes:

[0032] The control steps described in step S2 are executed one minute at a time during the control cycle. When the real-time power of one minute is equal to the control target, or is less than the control target and the average value of the real-time power of the previous minute is less than the monthly demand DC, the control is stopped.

[0033] If the real-time power in one minute is greater than the control target, control will continue in the next minute. The control target for the next minute is the difference between the real-time power in this minute and the monthly demand DC, plus the difference between the real-time power in the previous minute and the monthly demand DC.

[0034] Another aspect of the present invention further provides an industrial and commercial energy storage demand control system, comprising:

[0035] Control target module: real-time monitoring of the average power load of users per minute. If a deviation occurs when the monthly demand is exceeded, the control target for the next minute is determined after the deviation occurs, and a second-level control strategy is adopted according to the control target; the second-level control strategy is to implement n rounds of control within one minute, and the time for each round of control is the same number of seconds;

[0036] Minute control module: takes the control target of the next minute as the control target of each round, and adjusts the control strategy of the next round according to the real-time power of the user load of each round;

[0037] Periodic control module: The control period is 14 minutes after the deviation occurs. During the control period, the control result of each minute is used to decide whether to start the control for the next minute.

[0038] Furthermore, the control target for the next minute in the control target module includes two levels. The first control target is that the real-time demand does not exceed the monthly demand, which is expressed as DC-X(0), where DC represents the monthly demand and X(0) represents the deviation. The second control target is to eliminate the load power and charge amount increased by energy storage charging within one minute when the deviation occurs, and calculate the load power and discharge amount that should be released by discharging within the control period.

[0039] Furthermore, the minute control module includes:

[0040] Judgment unit: taking DC-X(0)+PSS as the upper limit and DC-X(0)-PSS as the lower limit, judging whether PL(i-1) is between the upper limit and the lower limit, wherein PSS is the rated installed power of the energy storage, i represents the i-th round of control within one minute, i=1, 2, ..., n; PL(i-1) is the real-time power of the user load in the previous round of control, and PL(0) represents the real-time power of the original power load of the user without being disturbed by the energy storage at the 0th second;

[0041] First result unit: if PL(i-1) is between the upper limit and the lower limit, the energy storage is determined to be discharged or charged according to whether PL(i) is greater than or less than the first control target, and the second control target is canceled at the same time;

[0042] Second result unit: if PL(i-1) is greater than the upper limit, the energy storage is fully discharged;

[0043] The third result unit: if PL(i-1) is less than the lower limit, the energy storage is fully charged;

[0044] Cyclic unit: cyclically executes n rounds of control and calculates the real-time power of this minute.

[0045] Furthermore, the cycle control module includes:

[0046] Execution unit: executes the control steps described in step S2 one minute at a time within the control cycle;

[0047] Stop unit: When the real-time power of one minute is equal to the control target, or is less than the control target and the average value of the real-time power of the previous minute is less than the monthly demand DC, the control is stopped;

[0048] Continue to control the unit: If the real-time power in one minute is greater than the control target, control will continue in the next minute. The control target for the next minute is the difference between the real-time power in this minute and the monthly demand DC, plus the difference between the real-time power in the previous minute and the monthly demand DC.

[0049] The present invention also provides a computer-readable storage medium, wherein the storage medium stores a computer program, and the computer program is used to execute the above-mentioned industrial and commercial energy storage demand control method.

[0050] The present invention also provides a computer program product, including a computer program, which implements the above-mentioned industrial and commercial energy storage demand control method when executed by a processor.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] 1. The present invention proposes a dual-target method for industrial and commercial energy storage in the field of demand electricity fee control. The first target is to make full efforts to correct the deviation from the second minute when the real-time demand deviates through algorithm logic. If the deviation cannot be corrected in the second minute, the third minute control target is immediately superimposed and generated, and the control is carried out for 14 minutes in sequence, so as to control the real-time demand below the established demand target through the energy storage system as much as possible; the second target is to ensure that the negative impact of energy storage in the process of real-time power exceeding the established demand target in the first minute can be completely neutralized through the correction efforts in these 14 minutes even if the first target cannot be achieved. The dual-target method can reduce the negative impact of energy storage in practical applications, maximize the positive impact, and eliminate the worries of using energy storage.

[0053] 2. The present invention can flexibly arrange the control granularity to adapt to various energy storage media. It can match the time granularity according to the control accuracy of the energy storage medium, and fine-tune the control target of the next control time granularity according to the real-time power consumption of the current time granularity and the power consumption generated by the load forecast, so as to make the control more refined.

[0054] 3. The algorithm logic proposed in the present invention can control the energy storage power value range to be between [charging rated power, discharging rated power] and freely select values ​​according to needs. Compared with the conventional control method of {energy storage fully charged; energy storage fully discharged; energy storage power is 0}, it has richer effects and more precise control, and can achieve the user's demand control target faster, and can also protect the interests of energy storage in this process. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 is a control logic schematic diagram of Embodiment 1 of the present invention;

[0056] Figure 2 is an explanatory diagram of determining the control target for the next minute according to Embodiment 1 of the present invention;

[0057] Figure 3 is an explanatory diagram of a one-minute control process of Embodiment 1 of the present invention;

[0058] Figure 4 It is an explanatory diagram of the one-minute control result of Example 1 of the present invention. DETAILED DESCRIPTION

[0059] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0060] The monthly electricity demand of corporate users is not an instantaneous value, but an average value of electricity power over a time period (currently 15 minutes). The generation mechanism is to take the average of the power at this time point and the power in the past 15 minutes to become the real-time demand at this time point. The corresponding 15-minute average power (real-time demand power) is generated at the next time point. Finally, all real-time demands are connected to a line, and the highest value of this line for the whole month is the maximum electricity demand of the corporate user for that month.

[0061] Since the monthly demand comes from the real-time demand, and the real-time demand is the average value of the power load within a time period (15 minutes), then from the first moment when the real-time power load becomes abnormal, for example, the average load value in the first minute exceeds the preset monthly demand value, intervention can be started in the second minute. There is still a long time to go, and it is very possible to control the stage average value below the established monthly demand value.

[0062] Based on the above logic, the present invention proposes a set of algorithm logic and a software system program for implementing the algorithm. The program runs in the energy storage system control software EMS (Energy Management System). EMS runs this set of algorithms and combines it with conventional peak-valley price charging and discharging strategies to comprehensively realize peak-valley arbitrage and demand control of energy storage.

[0063] In order to make the purpose and features of the present invention more obvious and understandable, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0064] Embodiment 1:

[0065] 1. Explanation of the meaning of parameters in this embodiment:

[0066]

[0067]

[0068] 2. After the deviation occurs, determine the next two control objectives and control logic;

[0069] like Figure 1 As shown, the control objectives and control logic include:

[0070] 2.1 Real-time monitoring of the average load power of the enterprise every minute. If there is a deviation in the first minute (exceeding the monthly demand DC), the dual control targets for the second minute (next minute) are quickly determined:

[0071] The determination of the dual control objectives includes:

[0072] The first control target: the real-time demand value (DCu) does not exceed the monthly demand DC set in advance;

[0073] The second control objective: Eliminate the increased load power and charging amount caused by energy storage charging within the first minute of deviation.

[0074] To achieve the first control target, it is necessary to determine the control value of the average power QP for the next minute. The average power QP for the next minute should be equal to or less than DC-X(0);

[0075] To achieve the second control target, it is necessary to count the load power and charge amount increased by energy storage charging within one minute of the deviation, and calculate the load power and discharge amount that should be released through discharge within the control period (the next 14 minutes).

[0076] Specific control objectives are determined as follows: Figure 2 As shown:

[0077] Figure 2 In the figure, the dotted lines represent the horizontal and vertical axes, the horizontal axis represents time, and the vertical axis represents power;

[0078] The horizontal line marking the monthly demand represents the monthly demand DC set in advance; one marked grid on the horizontal line represents a round of control according to the control accuracy within the next minute. Figure 1 Marked to 12, that is, 12 rounds of control are implemented in one minute, and control is performed as much as possible. In this embodiment, the energy storage medium is selected as electrochemical, which can support second-level control, and the control accuracy is 5 seconds, and collection and control are performed every 5 seconds; therefore, the next minute is divided into 12 rounds of control. If a different energy storage medium is used, the granularity of the control can be adjusted according to the control accuracy of the energy storage medium. For example, if gravity energy storage is used, the control accuracy is 10 seconds, and collection and control are performed every 10 seconds; therefore, the next minute is divided into 6 rounds of control.

[0079] The dot above the horizontal line marking the monthly demand represents the average power for one minute in which the deviation occurs, that is, the average power for the first minute in which the deviation occurs; the distance between the dot and the horizontal line is X(0), and X(0) represents the deviation between the average power for the first minute in which the deviation occurs and DC; in this embodiment, the deviation occurs due to energy storage charging, so as shown in the figure, X(0) also represents the excess value contributed by the energy storage charging in the past minute; X(0)=QP(0)-DC.

[0080] The short vertical line above the horizontal line marking the monthly demand represents the negative impact of energy storage charging in the past minute (the minute that caused the deviation), that is, the load power and charging amount increased by energy storage charging.

[0081] The dot below the horizontal line marking the monthly demand represents the first-level control target DC-X(0).

[0082] The vertical short line below the dot representing the first control target represents the second control target, which is to eliminate the load power and charge amount increased by energy storage charging.

[0083] Therefore, the 12-round control needs to achieve:

[0084] (1) In each round of control, strive to control the power at or below the first control target DC-X(0).

[0085] (2) In each round of control, strive to fully discharge the energy storage to ensure that the load power and discharge amount discharged in this minute of the 12-round control are equivalent to the load power and charge amount of the energy storage charging in the first minute with deviation, so as to achieve the second control target.

[0086] 2.2 Control process within one minute:

[0087] After determining the control target, the EMS issues a control instruction, and the control process includes:

[0088] 2.2.1 The 1st round of control:

[0089] Three situations will occur within 5 seconds (the 1st round of control) at the start of the control, which are described as follows:

[0090] Combined with Figure 3 for explanation, Figure 3 Based on Figure 2 , and below the horizontal line marking the monthly demand, there is a dotted line above and below the dot representing the control target respectively. The value of the upper dotted line is DC-X(0)+PSS, and the value of the lower dotted line is DC-X(0)-PSS;

[0091] Situation 1: If the real-time power PL(0) of the enterprise's original electricity load falls within the two dotted lines, it means:

[0092] |DC-X(0)-PL(0)|<PSS, which means that by adjusting the charge and discharge state and power of the energy storage, the power of this round can be fully controlled within the first control target, where:

[0093] (1.1) If PL(0) is below the dot of the first control target, it means PL(0) is less than the control target DC-X(0), then the energy storage can be charged, and the power is A(1)=PL(0)-(DC-X(0)); this power value is less than 0;

[0094] (1.2) If PL(0) is above the dot of the first control target, it means PL(0) is greater than the control target DC-X(0), then the energy storage can be discharged, and the power is A(1)=PL(0)-(DC-X(0)), and this power value is greater than 0;

[0095] Note: In this case, the first control target is achieved. At the same time, since there is no negative impact anymore, the second control target can be cancelled.

[0096] Case 2: If the real-time power PL(0) of the enterprise's original electricity load is above the upper dotted line, it means that no matter how it is controlled, the first control target cannot be achieved. At this time, the energy storage can discharge at full power to reduce the real-time power of the electricity load as much as possible. The discharge power A(1) = PSS;

[0097] Note: In this case, the first control target cannot be achieved. Try to achieve the second control target with all efforts. The energy storage discharges at the rated power for one minute, which can offset the negative impact in the first minute, and the second control target is achieved.

[0098] Case 3: If the real-time power PL(0) of the enterprise's original electricity load is below the lower dotted line, no matter how it is controlled, the first control target can be achieved. The energy storage can charge at full power, and the charging power A(1) = PSS;

[0099] Note: In this case, the first control target is achieved. At the same time, since there is no negative impact anymore, the second control target can be cancelled.

[0100] 2.2.2 Control in subsequent rounds of cycles:

[0101] In this embodiment, there are a total of 12 rounds of control, and the above control logic is looped 12 times. The difference in each round is to use PL(n) for judgment. Taking the second round as an example for illustration:

[0102] The second round also has three cases.

[0103] Case 1: If the real-time power PL(1) of the enterprise's electricity load falls within the two dotted lines, it means that:

[0104] |DC-X(0) - PL(1)| < PSS, which means that by adjusting the charge and discharge state and power of the energy storage, the next power can be completely controlled within the first control target;

[0105] (1.1) If PL(1) is below the dot of the first control target, it means that PL(1) is less than the control target DC-X(0), then the energy storage can charge, and the power is A(2) = PL(1) - (DC-X(0)); this power value is less than 0;

[0106] (1.2) If PL(1) is above the dot of the first control target, it means that PL(1) is greater than the control target DC-X(0), then the energy storage can discharge, and the power is A(2) = PL(1) - (DC-X(0)), and this power value is greater than 0;

[0107] Note: In this case, the first level of control objective is achieved, and because there is no longer any negative impact, the second level of control objective can be cancelled.

[0108] Case 2: The real-time power of the enterprise's original power load PL(1) is above the dotted line, which means that no matter how to control it, the first control target cannot be achieved. At this time, the energy storage can be fully discharged to reduce the real-time power of the power load as much as possible. The discharge power A(2) = PSS;

[0109] Note: In this case, the first control target cannot be achieved, and the second control target is achieved with all efforts. Discharging at rated power for one minute can offset the negative impact of the first minute, and the second control target can be achieved.

[0110] Case 3: The real-time power PL(1) of the enterprise's original power load is below the dotted line. At this time, the first control target can be achieved by any control method. The energy storage can be fully charged, and the charging power A(2) = PSS.

[0111] Note: In this case, the first control target is achieved, and since there is no negative impact, the second control target can be cancelled.

[0112] Referring to the control logic of the second round, each subsequent round compares the real-time power PL of the power load in the previous round with the two dotted lines and performs control, and a total of 12 rounds are executed.

[0113] Within one minute, the EMS periodically obtains the power load (owner load + energy storage load) of each round. After executing 12 rounds, the average power QP(1) of the controlled minute (i.e., the minute after the deviation occurs) is obtained:

[0114] QP(1)=(P(0)+……+P(11)) / 12;

[0115] Where P(n)=PL(n)+A(n), n={0,1,…,11}.

[0116] 2.3 The process after executing one minute control:

[0117] like Figure 4 The figure shows the control result after one minute of control.

[0118] After executing one minute of control (12 rounds of control), there are two results to determine whether the first level of control target is in place:

[0119] (1) If the average power QP(1) falls exactly at the power value represented by the first-level control target dot, or falls below the power value represented by the first-level control target dot, and the two-minute real-time power average is less than DC, no further control will be performed and all data will be reset. In this case, both the first-level control target and the second-level control target are achieved, and all control data are reset.

[0120] (2) The average power QP(1) falls above the power value represented by the control target dot. At this time, the real-time power average value of the two minutes (the minute in which the deviation occurs and the minute in which the control occurs) is greater than DC. The next minute needs to continue to perform demand control, and the first control target of the next minute is changed to the cumulative deviation of the previous two minutes X(0)+X(1)=(QP(0)-DC)+(QP(1)-DC). At this time, the next cycle begins, and the control of the next minute (the third minute) is carried out according to the control process within one minute described in 2.2. If the control in the next minute still fails to achieve the target, the cycle continues, and the first control target of each minute is the previous cumulative deviation. Until the 14th minute of this cycle is completed, the real-time demand of the entire 15 minutes is combined to determine whether it exceeds the established monthly demand DC.

[0121] At the same time, it is analyzed whether the second control target is achieved after this one minute of control. If not, the second control target will continue to be executed in the third minute. If so, the second control target (eliminating the increased load power and charging amount caused by energy storage charging) is fully achieved, and the second control target is canceled during the third minute of control.

[0122] According to the above scheme, it can be seen that the method proposed in this embodiment 1 has the following key points and effects:

[0123] 1. Set up two levels of control targets. When target one cannot be achieved, use target two as a backup.

[0124] The first control target: the total load of the enterprise does not exceed the demand;

[0125] The second control target: the total load of the enterprise exceeds the demand, but the negative impact of energy storage on the excess demand is zero; ensure that the second control target is guaranteed and protect the interests of the enterprise in the field of demand electricity charges;

[0126] Existing patent technologies all focus on how to adjust the power of energy storage. However, the role that energy storage can play in the operation of the entire enterprise's electricity load is limited in scope. This limit is "if the monthly demand exceeds the first minute, the energy storage will discharge at full power and work for 14 minutes." If this effect cannot reduce the enterprise's electricity load, it is inevitable that the enterprise's monthly demand will exceed the preset value.

[0127] Take Enterprise A as an example. Its daily average power load is 10,000 KW, and its monthly demand is set at 12,000 KW. During the off-peak period between 12:00 and 13:00, a power load of 16,000 KW appears for 15 minutes. The energy storage is charging in the first minute, and the total load of the enterprise is 18,000 KW (the energy storage construction scale is 2MW / 4MWh. At this time, charging for 1 minute increases the load by 2,000 KW). After the energy storage responds, it discharges at full power with 2MW power in the next 14 minutes to reduce the total load of the enterprise. The total load of the enterprise is 14,000 KW on average in the next 14 minutes. In this case, the real-time demand value is 14,270 KW. In this case, the result that the enterprise exceeds the monthly demand cannot be changed by the energy storage system.

[0128] In the above process, because charging and discharging are in the same electricity price period (valley price electricity), considering the loss of energy storage system (approximately between 84% and 86%), energy storage discharge is actually a loss. Therefore, it is necessary for the energy storage system to adjust from the first goal (not exceeding demand) to the second goal ("the total load of the enterprise exceeds demand, but the negative impact of energy storage on exceeding demand is 0")

[0129] Existing technical patents all describe how to control the charging and discharging power of energy storage to meet the first goal (the total enterprise load does not exceed the demand), but do not consider how to adjust the negative impact of energy storage to zero when the first goal can no longer be achieved, rather than continuing the original logic (which means that the losses of the energy storage system continue).

[0130] 2. Use energy storage discharge as a response measure to deal with the problem of excess demand during part of the real-time demand cycle during the charging period.

[0131] In the existing technical patents, more attention is paid to adjusting the charging power during the charging period. In fact, the charging power of the energy storage can be changed to the discharging power, so as to reduce the average power within the real-time demand cycle as much as possible.

[0132] 3. Real-time intervention and preventive intervention during the demand formation process.

[0133] The method of this embodiment provides a method for setting the control frequency, a specific target value generation mechanism at each frequency point, a mechanism for the target value to change dynamically over time, and a mechanism for the real power of energy storage to change with the target value. The real power of energy storage can change dynamically between the full-power charging and full-power discharging areas, making the adjustment means more comprehensive and the adjustment method more flexible, and achieving the adjustment target faster. In summary, the control frequency is refined (time period, seconds or N seconds), the control target is refined (real-time accuracy, combined with the predicted value generated according to the real-time accuracy), and the control value is refined (chargeable and dischargeable, the entire power is freely adjusted between [-PSS, PSS] as needed, especially dischargeable, which greatly improves the control means).

[0134] Embodiment 2:

[0135] This embodiment 2 proposes an industrial and commercial energy storage demand control system, including:

[0136] Control target module: real-time monitoring of the average power load of users per minute. If a deviation occurs when the monthly demand is exceeded, the control target for the next minute is determined after the deviation occurs, and a second-level control strategy is adopted according to the control target; the second-level control strategy is to implement n rounds of control within one minute, and the time for each round of control is the same number of seconds;

[0137] Minute control module: takes the control target of the next minute as the control target of each round, and adjusts the control strategy of the next round according to the real-time power of the user load of each round;

[0138] Periodic control module: The control period is 14 minutes after the deviation occurs. During the control period, the control result of each minute is used to decide whether to start the control for the next minute.

[0139] Among them, the control target for the next minute in the control target module includes two levels. The first control target is that the real-time demand does not exceed the monthly demand, which is expressed as DC-X(0), where DC represents the monthly demand and X(0) represents the deviation; the second control target is to eliminate the load power and charge amount increased by energy storage charging within one minute when the deviation occurs, and calculate the load power and discharge amount that should be released by discharging within the control period.

[0140] Minute control module includes:

[0141] Judgment unit: taking DC-X(0)+PSS as the upper limit and DC-X(0)-PSS as the lower limit, judging whether PL(i-1) is between the upper limit and the lower limit, wherein PSS is the rated installed power of the energy storage, i represents the i-th round of control within one minute, i=1, 2, ..., n; PL(i-1) is the real-time power of the user load in the previous round of control, and PL(0) represents the real-time power of the original power load of the user without being disturbed by the energy storage at the 0th second;

[0142] First result unit: if PL(i-1) is between the upper limit and the lower limit, the energy storage is determined to be discharged or charged according to whether PL(i) is greater than or less than the first control target, and the second control target is canceled at the same time;

[0143] Second result unit: if PL(i-1) is greater than the upper limit, the energy storage is fully discharged;

[0144] The third result unit: if PL(i-1) is less than the lower limit, the energy storage is fully charged;

[0145] Cyclic unit: cyclically executes n rounds of control and calculates the real-time power of this minute.

[0146] The cycle control module includes:

[0147] Execution unit: executes the control steps described in step S2 one minute at a time within the control cycle;

[0148] Stop unit: When the real-time power of one minute is equal to the control target, or is less than the control target and the average value of the real-time power of the previous minute is less than the monthly demand DC, the control is stopped;

[0149] Continue to control the unit: If the real-time power in one minute is greater than the control target, control will continue in the next minute. The control target for the next minute is the difference between the real-time power in this minute and the monthly demand DC, plus the difference between the real-time power in the previous minute and the monthly demand DC.

[0150] The industrial and commercial energy storage demand control system proposed in this embodiment 2 can implement the industrial and commercial energy storage demand control method proposed in embodiment 1, and has the same effect as embodiment 1.

[0151] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling industrial and commercial energy storage demand, characterized in that: include: S1. Real-time monitoring of the average power load of users per minute. If a deviation occurs when the monthly demand is exceeded, the control target for the next minute is determined after the deviation occurs, and a second-level control strategy is adopted according to the control target; the second-level control strategy is to implement n rounds of control within one minute, and the time of each round of control is the same number of seconds; S2, taking the control target of the next minute as the control target of each round, and adjusting the control strategy of the next round according to the real-time power of the user load of each round; S3. Take 14 minutes after the deviation occurs as the control cycle, and decide whether to start the control for the next minute based on the control result of each minute within the control cycle.

2. The industrial and commercial energy storage demand control method according to claim 1, characterized in that: The control target for the next minute described in step S1 includes two levels. The first control target is that the real-time demand does not exceed the monthly demand, which is expressed as DC-X(0), where DC represents the monthly demand and X(0) represents the deviation. The second control target is to eliminate the load power and charge amount increased by energy storage charging within one minute when the deviation occurs, and calculate the load power and discharge amount that should be released by discharging within the control period.

3. The industrial and commercial energy storage demand control method according to claim 2, characterized in that: Step S2 specifically includes: S201, taking DC-X(0)+PSS as the upper limit and DC-X(0)-PSS as the lower limit, determine whether PL(i-1) is between the upper limit and the lower limit, where PSS is the rated installed power of the energy storage, i represents the i-th round of control within one minute, i=1, 2, ..., n; PL(i-1) is the real-time power of the user load in the previous round of control, and PL(0) represents the real-time power of the original power load of the user without being disturbed by the energy storage at the 0th second; S202, if PL(i-1) is between the upper limit and the lower limit, whether the energy storage is discharged or charged is determined according to whether PL(i) is greater than or less than the first control target, and the second control target is canceled at the same time; S203, if PL(i-1) is greater than the upper limit, the energy storage is fully discharged; S204, if PL(i-1) is less than the lower limit, the energy storage is fully charged; S205, execute n rounds of control in a loop, and calculate the real-time power of this minute.

4. The industrial and commercial energy storage demand control method according to claim 3, characterized in that: Step S3 specifically includes: The control steps described in step S2 are executed one minute at a time during the control cycle. When the real-time power of one minute is equal to the control target, or is less than the control target and the average value of the real-time power of the previous minute is less than the monthly demand DC, the control is stopped. If the real-time power in one minute is greater than the control target, control will continue in the next minute. The control target for the next minute is the difference between the real-time power in this minute and the monthly demand DC, plus the difference between the real-time power in the previous minute and the monthly demand DC.

5. An industrial and commercial energy storage demand control system, characterized in that: include: Control target module: real-time monitoring of the average power load of users per minute. If a deviation occurs when the monthly demand is exceeded, the control target for the next minute is determined after the deviation occurs, and a second-level control strategy is adopted according to the control target; the second-level control strategy is to implement n rounds of control within one minute, and the time for each round of control is the same number of seconds; Minute control module: takes the control target of the next minute as the control target of each round, and adjusts the control strategy of the next round according to the real-time power of the user load of each round; Periodic control module: The control period is 14 minutes after the deviation occurs. During the control period, the control result of each minute is used to decide whether to start the control for the next minute.

6. The industrial and commercial energy storage demand control system according to claim 5, characterized in that: The control target for the next minute in the control target module includes two levels. The first control target is that the real-time demand does not exceed the monthly demand, which is expressed as DC-X(0), where DC represents the monthly demand and X(0) represents the deviation. The second control target is to eliminate the load power and charge amount increased by energy storage charging within one minute when the deviation occurs, and calculate the load power and discharge amount that should be released through discharge within the control period.

7. The industrial and commercial energy storage demand control system according to claim 6, characterized in that: Minute control module includes: Judgment unit: taking DC-X(0)+PSS as the upper limit and DC-X(0)-PSS as the lower limit, judging whether PL(i-1) is between the upper limit and the lower limit, wherein PSS is the rated installed power of the energy storage, i represents the i-th round of control within one minute, i=1, 2, ..., n; PL(i-1) is the real-time power of the user load in the previous round of control, and PL(0) represents the real-time power of the original power load of the user without being disturbed by the energy storage at the 0th second; First result unit: if PL(i-1) is between the upper limit and the lower limit, the energy storage is determined to be discharged or charged according to whether PL(i) is greater than or less than the first control target, and the second control target is canceled at the same time; Second result unit: if PL(i-1) is greater than the upper limit, the energy storage is fully discharged; The third result unit: if PL(i-1) is less than the lower limit, the energy storage is fully charged; Cyclic unit: cyclically executes n rounds of control and calculates the real-time power of this minute.

8. The industrial and commercial energy storage demand control system according to claim 7, characterized in that: The cycle control module includes: Execution unit: executes the control steps described in step S2 one minute at a time within the control cycle; Stop unit: When the real-time power of one minute is equal to the control target, or is less than the control target and the average value of the real-time power of the previous minute is less than the monthly demand DC, the control is stopped; Continue to control the unit: If the real-time power in one minute is greater than the control target, control will continue in the next minute. The control target for the next minute is the difference between the real-time power in this minute and the monthly demand DC, plus the difference between the real-time power in the previous minute and the monthly demand DC.

9. A computer-readable storage medium storing a computer program, characterized in that: The computer program is used to execute the industrial and commercial energy storage demand control method as described in any one of claims 1-4.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the industrial and commercial energy storage demand control method as described in any one of claims 1-4 is implemented.

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