Power Coordination Control Method and System for Diesel-Storage Multi-Source Power Supply System under Pulse Load

Abstract

The present invention discloses a power coordination control method and system for a diesel - energy storage multi - source power supply system under pulse loads. By detecting the change amounts of the output powers of the diesel generator and multiple energy storage converters, the calculated value of the virtual synchronous torque of the energy storage converters is changed in real time. By detecting whether a pulse load is connected, different virtual synchronous torque given strategies are given, so that under pulse loads, the angular accelerations of each energy storage converter can quickly track the diesel generator, effectively reducing the angular acceleration difference between each energy storage converter and the diesel generator when the load suddenly changes, thereby suppressing the low - frequency oscillation of the output powers of the diesel generator and multiple energy storage converters under pulse load conditions, and enabling the power synchronous output of the diesel - energy storage multi - source power supply system to be achieved quickly.

Description

Technical Field

[0001] The present invention relates to the field of power supply and control, and particularly to a power coordination control method and system for a diesel-storage multi-source power supply system under pulse loads. Background Art

[0002] Since remote deserts, islands, and border areas are far from the large power grid, the cost of laying wires is high and the loss is large, so a self-sufficient power supply method is often adopted. A multi-source power supply system composed of a diesel generator and energy storage can use the energy storage to share the load pressure of the diesel generator, and can provide more stable electrical energy in terms of voltage and frequency, with high reliability and high stability, and has obvious advantages over a diesel generator system with a single form of power supply. However, for special loads, such loads exhibit pulse characteristics, with fast load changes and large instantaneous power. Multiple energy storages may be required to provide instantaneous power for the pulse load. However, when facing such pulse loads, due to the difference in inertia between the diesel generator and the energy storage converter, the power response speeds of the diesel generator and the energy storage converter are inconsistent, making the coordinated operation of the diesel-storage multi-source power supply system a great technical challenge.

[0003] In order to meet the power supply requirements of pulse loads, the diesel-storage multi-source power supply system must operate in coordination to maintain a stable AC bus voltage. Otherwise, it will cause bus voltage fluctuations and even power supply failures. The energy storage converter often uses droop control to reasonably distribute power. However, due to the inertial characteristics of the diesel generator, the energy storage converter is prone to absorbing a large amount of power when facing pulse loads, thus causing the energy storage converter to be damaged by overcurrent. Therefore, operating it in the virtual synchronous machine state can well match the inertia of the diesel generator, thereby avoiding overcurrent of the energy storage converter. Since the inertia and damping of the diesel generator cannot be adjusted and accurately detected, the energy storage converter cannot directly perform matching design according to the inertia and damping of the diesel generator. Especially after the pulse load is connected, if the inertia of the diesel generator and the energy storage converter do not match, it will cause strong power oscillations and endanger the safe and stable operation of the system.

[0004] Although the invention patent application CN112271723A and the invention patent application CN113890065A provide solutions to the energy synchronization problem of the diesel-storage microgrid system under short-time high-energy pulse load conditions, there are still the following deficiencies. The method provided by the invention patent application CN112271723A mainly focuses on narrowing the output angular frequency between the diesel generator and the energy storage converter, and uses angular frequency feedback to dynamically adjust the virtual synchronous torque of the energy storage converter. The adjustment speed is slow, and it is easy to have uneven power distribution under the pulse load conditions of a short cycle, thus causing power oscillation in the diesel-storage power supply system. The invention patent application CN113890065A improves the invention patent application CN112271723A, and directly uses the magnitude relationship of angular acceleration to adaptively adjust the dynamic synchronous torque coefficient of the energy storage converter, which can achieve dynamic adjustment of the diesel-storage microgrid system faster. However, it requires rapid detection of angular acceleration, and the implementation difficulty is great. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a power coordination control method and system for a diesel-storage multi-source power supply system under pulse load, which can achieve rapid tracking of the angular acceleration of the energy storage converter by the diesel generator without detecting the angular acceleration, solve the problem of asynchronous output power caused by the inertia difference between the diesel generator and the energy storage converter, and can quickly respond to the safe and stable power supply of the diesel-storage multi-source power supply system under pulse load conditions.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a power coordination control method for a diesel-storage multi-source power supply system under pulse load, where the diesel-storage multi-source power supply system includes a diesel generator and at least one energy storage converter; the diesel generator, the energy storage converter, and the load are all connected to the AC bus; the method includes:

[0007] S1. Sample the three-phase output voltage and three-phase output current of all energy storage converters, and the three-phase output voltage and three-phase output current of the load.

[0008] S2. Calculate the instantaneous active power and instantaneous reactive power using the following formula:

[0009]

[0010] where, P k (t) represents the instantaneous active power, N represents sampling N points of a voltage or current signal, Q k (t) represents the instantaneous reactive power; the subscript k represents different variables, k = 1 represents the diesel generator, and at this time u k (n), i k(n) respectively represent the three-phase output voltage and three-phase output current of the diesel generator; k = 2,..., n respectively represent the 1st,..., the (n - 1)th energy storage converter. At this time, u k (n), i k (n) respectively represent the three-phase output voltage and three-phase output current of the 1st,..., the (n - 1)th energy storage converter; k = L represents the load. At this time, u k (n), i k (n) respectively represent the three-phase output voltage and three-phase output current of the load; t represents the current time point, t ≥ N;

[0011] Calculate the current calculated value of the virtual synchronous torque of each energy storage converter, and then obtain the given value of the virtual synchronous torque of each energy storage converter;

[0012] S3. Use the output active power, given value of virtual synchronous torque, rated output power, and rated output voltage angular frequency of each energy storage converter to calculate the output voltage angular frequency of each energy storage converter, and use the output voltage angular frequency of each energy storage converter to calculate the output voltage phase angle command value of the energy storage converter;

[0013] Use the output reactive power, output voltage amplitude, rated output reactive power, and AC bus voltage amplitude of each energy storage converter to calculate the output voltage command value of each energy storage converter;

[0014] S4. Use the output voltage phase angle command value and output voltage command value of each energy storage converter to obtain the output voltage control signal of each energy storage converter;

[0015] S5. Perform PWM modulation on the output voltage control signal of each energy storage converter to obtain the drive signal of each energy storage converter.

[0016] The present invention can, without detecting the angular acceleration, by detecting the change amount of the output power of the diesel generator and multiple energy storage converters, change the virtual synchronous torque of the energy storage converter in real time, so as to adjust the angular acceleration of the energy storage converter, make the angular acceleration of the energy storage converter quickly track the diesel generator, solve the problem of asynchronous output power caused by the inertia difference between the diesel generator and the energy storage converter, thereby suppressing the low-frequency oscillation of the output power of the diesel generator and multiple energy storage converters under pulse load conditions, and can quickly realize the power synchronous output of the diesel-storage multi-source power supply system.

[0017] Furthermore, in the present invention, the current calculated value T cti of the virtual synchronous torque of the i-th energy storage converter is calculated by the formula: where G represents the differential coefficient, h1 represents the active droop coefficient of the diesel generator, h i represents the active droop coefficient of the i-th energy storage converter, Psj represents the active power output of the i-th energy storage converter, P L represents the load power. The virtual synchronous torque is calculated using the derivative of the instantaneous power, indirectly realizing the regulation of the angular acceleration and avoiding the technical difficulties brought about by directly using the angular acceleration.

[0018] Furthermore, in the present invention, the process of obtaining the virtual synchronous torque set value of the i-th energy storage converter includes:

[0019] 1) Calculate the absolute value |dP L / dt| of the derivative of the load power P L with respect to time, and determine whether |dP L / dt| is greater than the threshold C. If |dP L / dt| > C, the first input is 1, indicating that a pulsed load action is detected; otherwise, the first input is 0, indicating that there is no pulsed load action;

[0020] 2) Determine whether the current calculated value T cti of the virtual synchronous torque of the i-th energy storage converter is greater than the virtual synchronous torque set value T Vi of the i-th energy storage converter. If T cti > T Vi , the second input is 1; otherwise, the second input is 0;

[0021] 3) Perform an AND operation on the first input and the second input, multiply the output of the AND operation by the latch time t L , divide the product by the switching period T c of the energy storage converter to obtain the counting time M, send the counting time to the counter, the counter subtracts 1 every switching period, and determine whether the count reaches 0; if the count does not reach 0, the virtual synchronous torque set value T Vi of the i-th energy storage converter is set to the calculated value of the virtual synchronous torque of the i-th energy storage converter at the start time of counting; if the count reaches 0, the virtual synchronous torque set value T Vi of the i-th energy storage converter takes the calculated value of the virtual synchronous torque of the i-th energy storage converter at the current moment, and returns to step 1) again.

[0022] In the present invention, the latch time t L takes 5% - 10% of the pulsed load period. In order to track the pulsed load faster, it is desirable that the value of t L is as large as possible to avoid repeated changes in the calculated value of the virtual synchronous torque when the pulsed load is inserted or removed. However, too large a value will affect the dynamic power distribution of the diesel - energy storage power supply system. Therefore, considering the trade - off between the pulsed load power disturbance and the dynamic power distribution, t L takes a value of 5% - 10% of the pulse period.

[0023] The virtual synchronous torque optimization process of the present invention can effectively distinguish the fluctuations of pulse loads and conventional loads. After detecting the input of a pulse load, a larger virtual synchronous torque value is given, so as to more quickly achieve the power synchronous output of the diesel - energy storage multi - source power supply system under pulse loads. The present invention detects whether a pulse load is input and gives different virtual synchronous torque setting strategies, so that under pulse loads, the angular acceleration of each energy storage converter can quickly track the diesel generator, effectively reducing the angular acceleration difference between each energy storage converter and the diesel generator during load mutation, thereby suppressing the low - frequency oscillation of the output power of the diesel generator and multiple energy storage converters under pulse load conditions, and can quickly achieve the power synchronous output of the diesel - energy storage multi - source power supply system.

[0024] Further, in the present invention, the output voltage angular frequency ω of the i - th energy storage converter i The calculation formula is: where i = 2, ……, n; J i represents the virtual inertia coefficient of the i - th energy storage converter, P Ni represents the rated active power of the i - th energy storage converter, P si represents the output active power of the i - th energy storage converter, D si represents the damping coefficient of the i - th energy storage converter, T vi represents the virtual synchronous torque setting value of the i - th energy storage converter. By adding virtual synchronous torque to the active - frequency control and changing the value of virtual synchronous torque according to the input situation of the pulse load, the angular acceleration of the energy storage converter can track the diesel generator more quickly, thus avoiding power oscillation.

[0025] Further, in the present invention, the output voltage command value U of the i - th energy storage converter pi The calculation formula is: U pi = ∫((Q Ni -Q si )k qi +(U N -U si )D qi )dt; where i = 2, ……, n; U N represents the AC bus voltage amplitude, k qi represents the virtual reactive inertia coefficient of the i - th energy storage converter, D qi represents the damping coefficient of the i - th energy storage converter, Q Ni represents the rated output reactive power of the i - th energy storage converter, Q si represents the output reactive power of the i - th energy storage converter, U Si represents the output voltage amplitude of the i - th energy storage converter.

[0026] Further, in the present invention, the output voltage control signal u of the i-th energy storage converter pi The calculation formula is: u pi = U pi sinθ i , where θ i is the output phase angle command value of the i-th energy storage converter, and U pi is the output voltage command value of the i-th energy storage converter.

[0027] As an inventive concept, the present invention also provides a power coordination control system for a diesel - energy storage multi - source power supply system under pulsed loads, which includes:

[0028] One or more processors;

[0029] A memory, on which one or more programs are stored. When the one or more programs are executed by the one or more processors, the one or more processors implement the steps of the above - mentioned method of the present invention.

[0030] As an inventive concept, the present invention also provides a diesel - energy storage multi - source power supply system under pulsed loads, which adopts the above - mentioned control system.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: Under the impact of short - time high - energy pulsed loads, the present invention uses the change amount of the instantaneous power of the energy storage converter and the diesel generator. Without the need to detect the angular acceleration, it can dynamically adjust the angular acceleration of the energy storage converter. In the case of the inertia black - boxing of the diesel generator, it can narrow the angular acceleration difference between the energy storage converter and the diesel generator, and can quickly achieve the synchronous output of the diesel - energy storage under pulsed load conditions, thereby avoiding the power oscillation of the diesel - energy storage power supply system; The present invention dynamically adjusts the virtual synchronous torque of the energy storage converter, can detect pulsed loads and conventional loads, and then gives different virtual synchronous torque optimization strategies, which can quickly narrow the angular acceleration gap between the energy storage converter and the diesel generator, thus avoiding the power oscillation of the diesel - energy storage multi - source power supply system under pulsed loads and realizing the power synchronous output of the diesel - energy storage multi - source power supply system. In addition, the present invention is applicable not only to a power supply system composed of one diesel generator and one energy storage converter, but also to a multi - source power supply system composed of one diesel generator and multiple energy storages. Description of the Drawings

[0032] Figure 1 is the power coordination control method for the diesel - energy storage multi - source power supply system under pulsed loads in the embodiment of the present invention;

[0033] Figure 2 is the virtual synchronous torque optimization flow chart in the embodiment of the present invention;

[0034] Fig. 3(a) shows the output power waveform of the diesel - energy storage multi - source power supply system under a pulsed load in the traditional control mode; Fig. 3(b) shows the output power waveform of the diesel - energy storage multi - source power supply system under a pulsed load in the embodiment of the present invention. Detailed implementation manners

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] As Figure 1 shown, in the power coordination control method of the diesel - energy storage multi - source power supply system under a pulsed load in the embodiment of the present invention, the virtual synchronous torque is calculated through the instantaneous power of the diesel generator and the energy storage converter, and the virtual synchronous torque is added to the active - frequency control link. By using the dynamic adjustment of the virtual synchronous torque, the angular acceleration of the energy storage converter is changed, thereby reducing the angular acceleration difference between the energy storage converter and the diesel generator, enabling the diesel - energy storage multi - source power supply system to output power synchronously. Especially under pulsed load conditions, the energy synchronization of the diesel - energy storage multi - source power supply system can be quickly achieved, avoiding power oscillation of the diesel - energy storage power supply system.

[0037] The diesel - energy storage multi - source power supply system under a pulsed load includes a diesel generator and at least one energy storage converter; both the diesel generator and the energy storage converter are connected to the AC bus, and the load is mounted on the AC bus.

[0038] In the embodiment of the present invention, the case of setting two energy storage converters in the diesel - energy storage multi - source power supply system under a pulsed load is taken as an example for illustration.

[0039] The following takes one diesel generator and two energy storage converters as an example to illustrate the power coordination control method of the embodiment of the present invention.

[0040] The power coordination control method of the embodiment of the present invention includes:

[0041] S1. Sample the three - phase output voltage u2 and three - phase output current i2 of energy storage converter 1, the three - phase output voltage u3 and three - phase output current i3 of energy storage converter 2, as well as the three - phase load voltage u L and the three - phase load current i L ;

[0042] S2. Use the instantaneous power calculation module to process the three - phase output voltages u2, u3, the three - phase output currents i2, i3, the three - phase load voltage u L , the three - phase load current i LCalculate the instantaneous power to obtain the active power P output by the energy storage converter 1 s2 and the reactive power Q output s2 ; the active power P output by the energy storage converter 2 s3 and the reactive power Q output s3 and the load power P L ;

[0043] In the embodiment of the present invention, the calculation expression of the instantaneous active power is as follows:

[0044]

[0045] In the embodiment of the present invention, the calculation expression of the instantaneous reactive power is as follows:

[0046]

[0047] where P k (t) represents the instantaneous active power, N represents sampling N points of a voltage or current signal, and Q k (t) represents the instantaneous reactive power; the subscript k represents different variables, k = 1 represents the diesel generator, k = 2 represents the energy storage converter 1, k = 3 represents the energy storage converter 2, and in addition, k = L represents the load.

[0048] Use the virtual synchronous torque calculation module to obtain the current calculated value T ct2 、T ct3 of the virtual synchronous torque, and obtain the given value T V2 、T V3 of the virtual synchronous torque through the virtual synchronous torque optimization module;

[0049] In the embodiment of the present invention, the calculation formula of the virtual synchronous torque is:

[0050]

[0051] where T ct2 、T ct3 respectively represent the current calculated values of the virtual synchronous torque of the energy storage converter 1 and the energy storage converter 2, G represents the differential coefficient, h1, h2, and h3 respectively represent the active droop coefficients of the diesel generator, the energy storage converter 1, and the energy storage converter 2, which are inversely proportional to their corresponding capacities. P s2 represents the active power output by the energy storage converter 1, P s3 represents the active power output by the energy storage converter 2, and P L represents the load power.

[0052] S3. Use the active power P output by the energy storage converter 1 s2 , the given value T of the virtual synchronous torque v2 and the rated output power P of the energy storage converter 1N2 and the rated output voltage angular frequency ω0 of the energy storage converter 1 to obtain the output voltage angular frequency ω2 of the energy storage converter 1. Similarly, the active power P output by the energy storage converter 2 is used s3 and the virtual synchronous torque set value T v3 as well as the rated output power P of the energy storage converter 2 N3 and the rated output voltage angular frequency ω0 of the energy storage converter 2 to obtain the output voltage angular frequency ω3 of the energy storage converter 2;

[0053] In the embodiment of the present invention, the calculation expression of the output voltage angular frequency of the energy storage converter is:

[0054]

[0055] where J2 and J3 respectively represent the virtual inertia coefficients of the energy storage converter 1 and the energy storage converter 2, D s2 and D s2 respectively represent the damping coefficients of the energy storage converter 1 and the energy storage converter 2, T v2 and T v2 respectively represent the virtual synchronous torque set values of the energy storage converter 1 and the energy storage converter 2, P N2 and P N3 represent the rated active powers of the energy storage converter 1 and the energy storage converter 2, P s2 and P s3 respectively represent the output active powers of the energy storage converter 1 and the energy storage converter 2.

[0056] The output voltage phase angle command values θ2 and θ3 of the energy storage converter are obtained by using the output voltage angular frequencies ω2 and ω3 of the energy storage converter. Among them, the output voltage phase angle θ is obtained through θ = ∫ωdt;

[0057] Using the reactive power Q output by the energy storage converter 1 s2 , the output voltage amplitude U of the energy storage converter 1 S2 as well as the rated output reactive power Q of the energy storage converter 1 N2 and the AC bus voltage amplitude U N , the output voltage command value U of the energy storage converter 1 is obtained p2 . Similarly, using the reactive power Q output by the energy storage converter 2 s3 , the output voltage amplitude U of the energy storage converter 2 S3 as well as the rated output reactive power Q of the energy storage converter 2 N3 and the AC bus voltage amplitude U N , the output voltage command value U of the energy storage converter 2 is obtained p3 .

[0058] In the embodiment of the present invention, the output voltage command of the energy storage converter is obtained through the following formula:

[0059]

[0060] Among them, U N represents the amplitude of the AC bus voltage, and k q2 represents the virtual reactive power inertia coefficient of energy storage converter 1, and D q2 represents the damping coefficient of energy storage converter 1, and k q3 represents the virtual reactive power inertia coefficient of energy storage converter 2, and D q3 represents the damping coefficient of energy storage converter 2;

[0061] S4. Using the phase angle command value θ2 output by energy storage converter 1 and the voltage command value U p2 output by energy storage converter 1, the output voltage control signal u p2 of the energy storage converter is obtained, where u p2 is obtained through u p2 =U p2 sinθ2. Similarly, using the phase angle command value θ3 output by the energy storage converter 2 and the voltage command value U p3 output by the energy storage converter 2, the output voltage control signal u p3 of the energy storage converter 2 is obtained, where u p3 is obtained through u p3 =U p3 sinθ3;

[0062] S5. Taking the output voltage control signal u p2 as the PWM input, the drive signal u d2 of the energy storage converter 1 is obtained through the PWM modulation module, which is used to drive the output of the energy storage converter 1. Similarly, taking the output voltage control signal u p3 as the PWM input, the drive signal u d3 of the energy storage converter 2 is obtained through the PWM modulation module, which is used to drive the output of the energy storage converter 2.

[0063] As Figure 2 shown, the specific implementation steps of the virtual synchronous torque optimization process in the embodiment of the present invention are as follows:

[0064] 1) Calculate the absolute value |dP L / dt| of the derivative of the load power P L with respect to time, and determine whether it is greater than the threshold C, and use it as the first input of the AND operation. If |dP L / dt|>C, the input is 1, indicating that a pulsed load action is detected. Otherwise, the input is 0, indicating that there is no pulsed load action.

[0065] 2) Determine whether the current calculated value T ct2 of the virtual synchronous torque is greater than the given value T V2as the second input for the AND operation. If T ct2 > T V2 , the input is 1. Otherwise, the input is 0

[0066] 3) Multiply the output of the AND operation by the latching time t L , and then divide it by the switching period T of the energy storage converter c to obtain the counting time M, and enter the counter. The counter decrements by one for each switching period, and during this period, it continuously determines whether the count reaches 0. If the count does not reach 0, the virtual synchronous torque given value T V2 maintains the virtual synchronous torque calculated value at the start moment of counting. If the count reaches 0, the virtual synchronous torque given value T V2 takes the current virtual synchronous torque calculated value and re-enters steps 1) to 3). Among them, the latching time t L takes 5% - 10% of the pulse load cycle.

[0067] 4) For the virtual synchronous torque optimization process of other energy storage converters, refer to steps 1) to 3).

[0068] The above optimization process loops continuously until the diesel - energy storage multi - source power supply system shuts down under the pulse load.

[0069] Figures 3(a) and 3(b) show the output power waveforms of the traditional VSG control method and the output power waveform of the diesel - energy storage multi - source power supply system in the embodiment of the present invention under the pulse load. From the waveform comparison in Figures 3(a) and 3(b), it can be seen that under the action of high - energy pulse loads, the virtual synchronous torque control method using the instantaneous power differential proposed in the embodiment of the present invention has better control effect compared with the traditional virtual synchronous machine control method, and the output power has no oscillation. During the period of high - energy pulse action, the energy synchronization effect of the diesel - energy storage multi - source power supply system in the embodiment of the present invention is better.

[0070] Another embodiment of the present invention provides a power coordination control system for a diesel - energy storage multi - source power supply system under a pulse load corresponding to the above - mentioned embodiment, including a memory, at least one processor, and a computer program stored on the memory; the processor executes the computer program on the memory to implement the steps of the method in the above - mentioned embodiment.

[0071] In some implementations, the memory can be a high - speed random - access memory (RAM: Random Access Memory), and may also include non - volatile memory, such as at least one disk memory.

[0072] In other implementations, the processor can be a general - purpose processor of various types such as a central processing unit (CPU), a digital signal processor (DSP), etc., which is not limited herein.

[0073] Another embodiment of the present invention provides a diesel - energy storage multi - source power supply system under pulse load corresponding to the above - mentioned embodiment system, and this power supply system adopts the power coordination control system of the above - mentioned embodiment.

[0074] In specific implementation, a processor such as a DSP is used to perform the arithmetic processing of the above - mentioned embodiment method on the three - phase output voltages and three - phase output currents of the diesel generator, energy storage converter, and load obtained by the voltage sensor and current sensor, so as to obtain the drive signals of each energy storage converter and drive the on - off of the switching tubes of each energy storage converter.

[0075] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0076] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these changes and modifications.

Claims

1. A power coordination control method for a diesel-storage multi-source power supply system under pulse loads. The diesel-storage multi-source power supply system includes a diesel generator and at least one energy storage converter; the diesel generator, the energy storage converter, and the load are all connected to the AC bus; characterized in that, The method includes: S1. Sampling the three-phase output voltage and three-phase output current of all energy storage converters, as well as the three-phase output voltage and three-phase output current of the load; S2. Calculating the instantaneous active power and instantaneous reactive power by using the following formula: Among them, P k (t) represents the instantaneous active power, N represents sampling N points of a voltage or current signal, and Q k (t) represents the instantaneous reactive power; the subscript k represents different variables, k = 1 represents the diesel generator, at this time u k (n), i k (n) respectively represent the three-phase output voltage and three-phase output current of the diesel generator; k = 2,..., n respectively represent the 1st,..., (n - 1)th energy storage converters, at this time u k (n), i k (n) respectively represent the three-phase output voltage and three-phase output current of the 1st,..., (n - 1)th energy storage converters; k = L represents the load, at this time u k (n), i k (n) respectively represent the three-phase output voltage and three-phase output current of the load; t represents the current time point, t ≥ N; Calculating the current calculated value of the virtual synchronous torque of each energy storage converter, and further obtaining the given value of the virtual synchronous torque of each energy storage converter; S3. Using the output active power, given value of the virtual synchronous torque, rated output power and rated output voltage angular frequency of each energy storage converter to calculate the output voltage angular frequency of each energy storage converter, and using the output voltage angular frequency of each energy storage converter to calculate the output voltage phase angle command value of the energy storage converter; Using the output reactive power, output voltage amplitude, rated output reactive power and AC bus voltage amplitude of each energy storage converter to calculate the output voltage command value of each energy storage converter; S4. Using the output voltage phase angle command value and output voltage command value of each energy storage converter to obtain the output voltage control signal of each energy storage converter; S5. Performing PWM modulation on the output voltage control signal of each energy storage converter to obtain the drive signal of each energy storage converter.

2. The power coordination control method of the diesel - energy storage multi - source power supply system under pulse load according to claim 1, wherein, The current calculated value T of the virtual synchronous torque of the i-th energy storage converter cti is calculated by the formula: Among them, G represents the differential coefficient, h1 represents the active droop coefficient of the diesel generator, and h i represents the active droop coefficient of the i-th energy storage converter, P si represents the output active power of the i-th energy storage converter, and P L represents the load power.

3. The power coordination control method for a diesel-storage multi-source power supply system under pulsed loads according to claim 1 or 2, characterized in that The process of obtaining the given value of the virtual synchronous torque of the i-th energy storage converter includes: 1) Calculate the load power P L The absolute value of the derivative with respect to time |dP L / dt|, and determine whether |dP L / dt| is greater than the threshold C. If |dP L / dt| > C, then the first input is 1, indicating that a pulsed load action is detected; otherwise, the first input is 0, indicating that there is no pulsed load action; 2) Determine whether the currently calculated value \(T\) of the virtual synchronous torque of the \(i\)-th energy storage converter cti is greater than the given value \(T\) of the virtual synchronous torque of the \(i\)-th energy storage converter Vi , if \(T\) cti \(>T\) Vi , then the second input is 1; otherwise the second input is 0; 3) Perform an AND operation on the first input and the second input, multiply the output of the AND operation by the latch time t L , divide the product by the switching period T of the energy storage converter c , obtain the counting time M, send the counting time to a counter, the counter decrements by 1 every switching period, and determine whether the count reaches 0; if the count does not reach 0, the virtual synchronous torque reference value T Vi of the i-th energy storage converter is set to the calculated value of the virtual synchronous torque of the i-th energy storage converter at the start time of counting; if the count reaches 0, then the virtual synchronous torque reference value T Vi of the i-th energy storage converter takes the calculated value of the virtual synchronous torque of the i-th energy storage converter at the current moment, and returns to step 1) again.

4. The power coordination control method for a diesel-storage multi-source power supply system under pulsed loads according to claim 3, characterized in that Latch time t L Take 5% - 10% of the pulse duty cycle.

5. The power coordination control method for a diesel-storage multi-source power supply system under pulsed loads according to claim 1, characterized in that, The output voltage angular frequency ω of the i-th energy storage converter i The calculation formula is as follows: where i = 2, ……, n; J i represents the virtual inertia coefficient of the i-th energy storage converter, P Ni represents the rated active power of the i-th energy storage converter, P si represents the output active power of the i-th energy storage converter, D si represents the damping coefficient of the i-th energy storage converter, T vi represents the virtual synchronous torque set value of the i-th energy storage converter.

6. The power coordination control method for a diesel - energy storage multi - source power supply system under pulsed loads according to claim 1, wherein The output voltage command value U of the i-th energy storage converter pi The calculation formula is: U pi = ∫((Q Ni - Q si )k qi + (U N - U si )D qi )dt; where i = 2,..., n; U N represents the amplitude of the AC bus voltage, k qi represents the virtual reactive power inertia coefficient of the i-th energy storage converter, D qi represents the damping coefficient of the i-th energy storage converter, Q Ni represents the rated output reactive power of the i-th energy storage converter, Q si represents the output reactive power of the i-th energy storage converter, U Si represents the output voltage amplitude of the i-th energy storage converter.

7. The power coordination control method of the diesel - energy storage multi - source power supply system under pulse load according to claim 1, wherein, The output voltage control signal u of the i-th energy storage converter pi The calculation formula is: u pi = U pi sinθ i , θ i is the output phase angle command value of the i-th energy storage converter, and U pi is the output voltage command value of the i-th energy storage converter.

8. A power coordination control system for a diesel-storage multi-source power supply system under pulse loads, characterized in that, Including: One or more processors; A memory storing one or more programs, which when executed by the one or more processors, cause the one or more processors to implement the steps of the method according to any one of claims 1 to 7.

9. A diesel - energy storage multi - source power supply system under pulse load, characterized in that, It adopts the control system according to claim 8.

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