JP-7855969-B2 - Power supply unit and voltage generation method

JP7855969B2JP 7855969 B2JP7855969 B2JP 7855969B2JP-7855969-B2

Inventors

上村浩文

Assignees

富士電機株式会社

Dates

Publication Date: 20260511
Application Date: 20220819

Claims (7)

A power supply device that inputs and outputs power to and from a power system by controlling the frequency of the output voltage, A calculation unit that calculates a command frequency for the output voltage based on a target first power to be output to the power system, a second power actually input and output to the power system, and a predetermined set frequency. A correction unit for correcting the command frequency, A generation unit that generates a control signal for controlling the output voltage based on the corrected command frequency, The system includes an output unit that outputs the output voltage generated based on the control signal to the power system, The correction unit, The command frequency is corrected based on the error between the command frequency before correction and the actual frequency of the output voltage, obtained in a steady state, so that the first power and the second power coincide in a steady state. power supply.
A power supply device according to claim 1, The correction unit corrects the command frequency using a pre-prepared table or relational expression that shows the relationship between the command frequency before correction and the information including the error, so that the actual frequency of the output voltage matches the command frequency before correction. power supply.
A power supply device according to claim 2, The information including the aforementioned error is the aforementioned error, The correction unit performs a process to reduce the error with respect to the command frequency before correction. power supply.
A power supply device according to claim 2, The information including the error is the corrected command frequency obtained by reducing the error compared to the command frequency before correction. The correction unit performs a process to replace the command frequency before correction with the command frequency after correction. power supply.
A power supply device according to any one of claims 1 to 4, The error is determined by the calculated difference between the command frequency and the frequency of the reference power supply in a steady state when the power supply device, including the calculation unit and the output unit, is connected to a reference power supply with a controllable frequency. power supply.
A power supply device according to any one of claims 1 to 4, The aforementioned error is determined by the difference between the measured value of the command frequency and the frequency of the reference power supply in a steady state when the power supply device, including the calculation unit and the output unit, is connected to a reference power supply capable of controlling frequency. power supply.
A power supply device that inputs and outputs power to and from the power system by controlling the frequency of the output voltage, A step of calculating a command frequency for the output voltage based on a target first power to be output to the power system, a second power actually input and output to the power system, and a predetermined set frequency. The steps of correcting the command frequency, The steps include generating a control signal for controlling the output voltage based on the corrected command frequency, The steps include outputting the output voltage generated based on the control signal to the power system, In the correction step, The command frequency is corrected based on the error between the command frequency before correction and the actual frequency of the output voltage, obtained in a steady state, so that the first power and the second power coincide in a steady state. Voltage generation method.

Description

This invention relates to a power supply device and a voltage generation method. Synchronous generators contribute to maintaining the frequency of the power system through the inertia of their rotating bodies. Recently, pseudo-synchronous generators that simulate synchronous generators by controlling the output of an inverter have become known (for example, Patent Document 1). Patent No. 7023430 This diagram illustrates an example of a power system 1 equipped with a typical power supply unit 5.This diagram illustrates an example of a power system 1 equipped with a typical power supply unit 5.This is a diagram illustrating the calculation unit 30 of a typical power supply unit 5.This diagram illustrates a method for verifying the accuracy of the actual frequency of the output voltage using a typical power supply unit 5.This diagram illustrates a method for verifying the accuracy of the actual frequency of the output voltage using a typical power supply unit 5.This figure shows an example of the relationship between the frequency of the reference power supply 6 and the error in the frequency of the output voltage.Embodiment 6 is a diagram illustrating an example of a power system 1 in which a power supply device 2 is provided.This is a diagram illustrating the correction unit 31 of the power supply unit 2 in Embodiment 6.This figure shows an example of a data table showing the error between the command frequency before correction and the output voltage frequency.This figure shows an example of a data table showing the command frequency before correction and the command frequency after correction. ==Implementation== <<General Power Supply Device 5>> Figure 1 illustrates an example of a power system 1 equipped with a general power supply unit 5. Here, before describing the power supply unit 2 (described later) of this embodiment, a general power supply unit 5 will be explained. The general power supply unit 5 is a so-called pseudo-synchronous generator that simulates a synchronous generator having a rotating body using a voltage control (GFM: Grid-ForMing) method. Specifically, the power supply unit 5 is a device that inputs and outputs power Pout to and from the power system 1 by controlling the frequency fout of the output voltage vout . Note that when power Pout is positive, it is the power output from the power supply unit 5 to the power system 1, and when it is negative, it is the power input from the power system 1 to the power supply unit 5. The power supply unit 5 is connected to the power system 1 via a line reactance X. The power supply unit 5 comprises a control unit 7 and an output unit 20. The following will first describe the hardware configuration of the control unit 7, and then describe the functional blocks of the power supply unit 2. <Hardware configuration of control device 7> The control device 7 includes a DSP (Digital Signal Processor) 35 and a storage device 36 (Figure 1). [DSP35] The DSP 35 executes a predetermined program stored in the storage device 36 to realize various functions of the control device 7. [Storage device 36] The storage device 36 includes a non-temporary (e.g., non-volatile) storage device that stores various data executed or processed by the DSP 35. The storage device 36 further includes, for example, RAM (Random-Access Memory) (memory 36a, described later), and is used as a temporary storage area for various programs and data. <Functional blocks of power supply unit 5> Figure 2 is a diagram illustrating an example of a power system 1 equipped with a general power supply unit 5, and more particularly, a diagram illustrating the functional blocks of the power supply unit 5. As a result of the DSP 35 executing a predetermined program, the control device 7 is configured with a calculation unit 30, an integrator 32, an instantaneous voltage control unit 33, and a PWM pulse generation unit 34. As a result, the power supply unit 5 comprises a calculation unit 30, an integrator 32, an instantaneous voltage control unit 33, a PWM pulse generation unit 34, and an output unit 20. Each of these will be described below. Furthermore, if blocks shown in the drawing are assigned the same reference numeral, those blocks are identical. [Calculation section 30] The calculation unit 30 simulates a synchronous generator using the GFM method and calculates the command frequency f ref for the output voltage v out that is output to the power system 1. Specifically, the calculation unit 30 calculates a command frequency f ref for the output voltage v out based on the target power Pref (corresponding to "first power") to be input and output to the power system 1, the power Pout (corresponding to "second power") that is actually input and output to the power system 1, and predetermined set frequencies f n and ref . In the following explanation, the inertia constant of the rotating body of the synchronous generator simulated by the calculation unit 30 is denoted as H, and the braking constant a